1.. 2 ------------------------------------------------------------------- 3 NOTE: This file is automatically generated by running clang-tblgen 4 -gen-opt-docs. Do not edit this file by hand!! 5 ------------------------------------------------------------------- 6 7===================================== 8Clang command line argument reference 9===================================== 10.. contents:: 11 :local: 12 13Introduction 14============ 15 16This page lists the command line arguments currently supported by the 17GCC-compatible ``clang`` and ``clang++`` drivers. 18 19 20.. program:: clang 21.. option:: -B<prefix>, --prefix <arg>, --prefix=<arg> 22 23Search $prefix$file for executables, libraries, and data files. If $prefix is a directory, search $prefix/$file 24 25.. option:: -F<arg> 26 27Add directory to framework include search path 28 29.. option:: -ObjC 30 31Treat source input files as Objective-C inputs 32 33.. program:: clang1 34.. option:: -ObjC++ 35.. program:: clang 36 37Treat source input files as Objective-C++ inputs 38 39.. option:: -Qn, -fno-ident 40 41Do not emit metadata containing compiler name and version 42 43.. option:: -Qunused-arguments 44 45Don't emit warning for unused driver arguments 46 47.. option:: -Qy, -fident 48 49Emit metadata containing compiler name and version 50 51.. option:: -Wa,<arg>,<arg2>... 52 53Pass the comma separated arguments in <arg> to the assembler 54 55.. option:: -Wlarge-by-value-copy=<arg> 56 57.. option:: -Xarch\_<arg1> <arg2> 58 59.. program:: clang1 60.. option:: -Xarch\_device <arg> 61.. program:: clang 62 63Pass <arg> to the CUDA/HIP device compilation 64 65.. program:: clang2 66.. option:: -Xarch\_host <arg> 67.. program:: clang 68 69Pass <arg> to the CUDA/HIP host compilation 70 71.. option:: -Xcuda-fatbinary <arg> 72 73Pass <arg> to fatbinary invocation 74 75.. option:: -Xcuda-ptxas <arg> 76 77Pass <arg> to the ptxas assembler 78 79.. option:: -Z<arg> 80 81.. option:: -a<arg>, --profile-blocks 82 83.. option:: -all\_load 84 85.. option:: -allowable\_client <arg> 86 87.. option:: --analyze 88 89Run the static analyzer 90 91.. option:: --analyzer-no-default-checks 92 93.. option:: --analyzer-output<arg> 94 95Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|sarif\|sarif-html\|text). 96 97.. option:: -arch <arg> 98 99.. program:: clang1 100.. option:: -arch\_errors\_fatal 101.. program:: clang 102 103.. program:: clang2 104.. option:: -arch\_only <arg> 105.. program:: clang 106 107.. option:: -arcmt-migrate-emit-errors 108 109Emit ARC errors even if the migrator can fix them 110 111.. option:: -arcmt-migrate-report-output <arg> 112 113Output path for the plist report 114 115.. option:: --autocomplete=<arg> 116 117.. option:: -bind\_at\_load 118 119.. option:: -bundle 120 121.. program:: clang1 122.. option:: -bundle\_loader <arg> 123.. program:: clang 124 125.. option:: -client\_name<arg> 126 127.. option:: -compatibility\_version<arg> 128 129.. option:: --config <arg> 130 131Specifies configuration file 132 133.. option:: --constant-cfstrings 134 135.. option:: --cuda-feature=<arg> 136 137Manually specify the CUDA feature to use 138 139.. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> 140 141Include PTX for the following GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. 142 143.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 144 145Enable device-side debug info generation. Disables ptxas optimizations. 146 147.. option:: -cuid=<arg> 148 149An ID for compilation unit, which should be the same for the same compilation unit but different for different compilation units. It is used to externalize device-side static variables for single source offloading languages CUDA and HIP so that they can be accessed by the host code of the same compilation unit. 150 151.. option:: -current\_version<arg> 152 153.. option:: -darwin-target-variant <arg> 154 155Generate code for an additional runtime variant of the deployment target 156 157.. option:: -darwin-target-variant-triple <arg> 158 159Specify the darwin target variant triple 160 161.. option:: -dead\_strip 162 163.. option:: -dependency-dot <arg> 164 165Filename to write DOT-formatted header dependencies to 166 167.. option:: -dependency-file <arg> 168 169Filename (or -) to write dependency output to 170 171.. option:: -dsym-dir<dir> 172 173Directory to output dSYM's (if any) to 174 175.. option:: -dumpmachine 176 177.. option:: -dumpversion 178 179.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 180 181.. option:: -dylib\_file <arg> 182 183.. option:: -dylinker 184 185.. program:: clang1 186.. option:: -dylinker\_install\_name<arg> 187.. program:: clang 188 189.. option:: -dynamic 190 191.. option:: -dynamiclib 192 193.. option:: -emit-ast 194 195Emit Clang AST files for source inputs 196 197.. option:: --emit-static-lib 198 199Enable linker job to emit a static library. 200 201.. option:: -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 202 203Trivial automatic variable initialization to zero is only here for benchmarks, it'll eventually be removed, and I'm OK with that because I'm only using it to benchmark 204 205.. option:: --end-no-unused-arguments 206 207Start emitting warnings for unused driver arguments 208 209.. option:: -exported\_symbols\_list <arg> 210 211.. option:: -faligned-new=<arg> 212 213.. option:: -fautomatic 214 215.. option:: -ffixed-r19 216 217Reserve register r19 (Hexagon only) 218 219.. option:: -fgpu-default-stream=<arg> 220 221Specify default stream. The default value is 'legacy'. (HIP only). <arg> must be 'legacy' or 'per-thread'. 222 223.. option:: -fgpu-flush-denormals-to-zero, -fcuda-flush-denormals-to-zero, -fno-gpu-flush-denormals-to-zero 224 225Flush denormal floating point values to zero in CUDA/HIP device mode. 226 227.. option:: -fheinous-gnu-extensions 228 229.. option:: -flat\_namespace 230 231.. option:: -fopenmp-targets=<arg1>,<arg2>... 232 233Specify comma-separated list of triples OpenMP offloading targets to be supported 234 235.. option:: -force\_cpusubtype\_ALL 236 237.. program:: clang1 238.. option:: -force\_flat\_namespace 239.. program:: clang 240 241.. program:: clang2 242.. option:: -force\_load <arg> 243.. program:: clang 244 245.. option:: -fplugin-arg-<name>-<arg> 246 247Pass <arg> to plugin <name> 248 249.. option:: -framework <arg> 250 251.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 252 253Add -rpath with architecture-specific resource directory to the linker flags 254 255.. option:: -fsanitize-system-ignorelist=<arg>, -fsanitize-system-blacklist=<arg> 256 257Path to system ignorelist file for sanitizers 258 259.. option:: -fshow-skipped-includes 260 261#include files may be "skipped" due to include guard optimization 262 or #pragma once. This flag makes -H show also such includes. 263 264.. option:: -fsystem-module 265 266Build this module as a system module. Only used with -emit-module 267 268.. option:: -fuse-cuid=<arg> 269 270Method to generate ID's for compilation units for single source offloading languages CUDA and HIP: 'hash' (ID's generated by hashing file path and command line options) \| 'random' (ID's generated as random numbers) \| 'none' (disabled). Default is 'hash'. This option will be overridden by option '-cuid=\[ID\]' if it is specified. 271 272.. option:: --gcc-toolchain=<arg> 273 274Search for GCC installation in the specified directory on targets which commonly use GCC. The directory usually contains 'lib{,32,64}/gcc{,-cross}/$triple' and 'include'. If specified, sysroot is skipped for GCC detection. Note: executables (e.g. ld) used by the compiler are not overridden by the selected GCC installation 275 276.. option:: -gcodeview 277 278Generate CodeView debug information 279 280.. option:: -gcodeview-ghash, -gno-codeview-ghash 281 282Emit type record hashes in a .debug$H section 283 284.. option:: -gen-reproducer=<arg>, -fno-crash-diagnostics (equivalent to -gen-reproducer=off) 285 286Emit reproducer on (option: off, crash (default), error, always) 287 288.. option:: --gpu-instrument-lib=<arg> 289 290Instrument device library for HIP, which is a LLVM bitcode containing \_\_cyg\_profile\_func\_enter and \_\_cyg\_profile\_func\_exit 291 292.. option:: --gpu-max-threads-per-block=<arg> 293 294Default max threads per block for kernel launch bounds for HIP 295 296.. option:: -headerpad\_max\_install\_names<arg> 297 298.. option:: -help, --help, /help<arg>, -help<arg>, --help<arg> 299 300Display available options 301 302.. option:: --help-hidden 303 304Display help for hidden options 305 306.. option:: --hip-link 307 308Link clang-offload-bundler bundles for HIP 309 310.. option:: --hip-version=<arg> 311 312HIP version in the format of major.minor.patch 313 314.. option:: -ibuiltininc 315 316Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it 317 318.. option:: -image\_base <arg> 319 320.. option:: -index-header-map 321 322Make the next included directory (-I or -F) an indexer header map 323 324.. option:: -init <arg> 325 326.. option:: -install\_name <arg> 327 328.. option:: -interface-stub-version=<arg> 329 330.. option:: -keep\_private\_externs 331 332.. option:: -lazy\_framework <arg> 333 334.. program:: clang1 335.. option:: -lazy\_library <arg> 336.. program:: clang 337 338.. option:: -mbig-endian, -EB 339 340.. option:: -menable-unsafe-fp-math 341 342Allow unsafe floating-point math optimizations which may decrease precision 343 344.. option:: -mharden-sls=<arg> 345 346Select straight-line speculation hardening scope (ARM/AArch64/X86 only). <arg> must be: all, none, retbr(ARM/AArch64), blr(ARM/AArch64), comdat(ARM/AArch64), nocomdat(ARM/AArch64), return(X86), indirect-jmp(X86) 347 348.. option:: --migrate 349 350Run the migrator 351 352.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 353 354.. option:: -mlinker-version=<arg> 355 356.. option:: -mlittle-endian, -EL 357 358.. option:: -mllvm <arg> 359 360Additional arguments to forward to LLVM's option processing 361 362.. option:: -mmlir <arg> 363 364Additional arguments to forward to MLIR's option processing 365 366.. option:: -module-dependency-dir <arg> 367 368Directory to dump module dependencies to 369 370.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 371 372.. option:: -multi\_module 373 374.. option:: -multiply\_defined <arg> 375 376.. program:: clang1 377.. option:: -multiply\_defined\_unused <arg> 378.. program:: clang 379 380.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 381 382.. option:: --no-cuda-version-check 383 384Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 385 386.. option:: -no-hip-rt 387 388Do not link against HIP runtime libraries 389 390.. option:: -no-integrated-cpp, --no-integrated-cpp 391 392.. option:: -no\_dead\_strip\_inits\_and\_terms 393 394.. option:: -nobuiltininc 395 396Disable builtin #include directories 397 398.. option:: -nodefaultlibs 399 400.. option:: -nodriverkitlib 401 402.. option:: -nofixprebinding 403 404.. option:: -nogpuinc, -nocudainc 405 406Do not add include paths for CUDA/HIP and do not include the default CUDA/HIP wrapper headers 407 408.. option:: -nogpulib, -nocudalib 409 410Do not link device library for CUDA/HIP device compilation 411 412.. option:: -nohipwrapperinc 413 414Do not include the default HIP wrapper headers and include paths 415 416.. option:: -nolibc 417 418.. option:: -nomultidefs 419 420.. option:: -nopie, -no-pie 421 422.. option:: -noprebind 423 424.. option:: -noprofilelib 425 426.. option:: -noseglinkedit 427 428.. option:: -nostdinc, --no-standard-includes 429 430.. program:: clang1 431.. option:: -nostdinc++ 432.. program:: clang 433 434Disable standard #include directories for the C++ standard library 435 436.. option:: -nostdlib++ 437 438.. option:: -nostdlibinc 439 440.. program:: clang1 441.. option:: -o<file>, /Fo<arg>, -Fo<arg>, --output <arg>, --output=<arg> 442.. program:: clang 443 444Write output to <file> 445 446.. option:: -objcmt-allowlist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg>, -objcmt-whitelist-dir-path=<arg> 447 448Only modify files with a filename contained in the provided directory path 449 450.. option:: -objcmt-atomic-property 451 452Make migration to 'atomic' properties 453 454.. option:: -objcmt-migrate-all 455 456Enable migration to modern ObjC 457 458.. option:: -objcmt-migrate-annotation 459 460Enable migration to property and method annotations 461 462.. option:: -objcmt-migrate-designated-init 463 464Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 465 466.. option:: -objcmt-migrate-instancetype 467 468Enable migration to infer instancetype for method result type 469 470.. option:: -objcmt-migrate-literals 471 472Enable migration to modern ObjC literals 473 474.. option:: -objcmt-migrate-ns-macros 475 476Enable migration to NS\_ENUM/NS\_OPTIONS macros 477 478.. option:: -objcmt-migrate-property 479 480Enable migration to modern ObjC property 481 482.. option:: -objcmt-migrate-property-dot-syntax 483 484Enable migration of setter/getter messages to property-dot syntax 485 486.. option:: -objcmt-migrate-protocol-conformance 487 488Enable migration to add protocol conformance on classes 489 490.. option:: -objcmt-migrate-readonly-property 491 492Enable migration to modern ObjC readonly property 493 494.. option:: -objcmt-migrate-readwrite-property 495 496Enable migration to modern ObjC readwrite property 497 498.. option:: -objcmt-migrate-subscripting 499 500Enable migration to modern ObjC subscripting 501 502.. option:: -objcmt-ns-nonatomic-iosonly 503 504Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 505 506.. option:: -objcmt-returns-innerpointer-property 507 508Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 509 510.. option:: -object 511 512.. option:: -object-file-name=<file>, -object-file-name <arg> 513 514Set the output <file> for debug infos 515 516.. option:: --offload-arch=<arg>, --cuda-gpu-arch=<arg>, --no-offload-arch=<arg> 517 518CUDA offloading device architecture (e.g. sm\_35), or HIP offloading target ID in the form of a device architecture followed by target ID features delimited by a colon. Each target ID feature is a pre-defined string followed by a plus or minus sign (e.g. gfx908:xnack+:sramecc-). May be specified more than once. 519 520.. option:: --offload-device-only, --cuda-device-only 521 522Only compile for the offloading device. 523 524.. option:: --offload-host-device, --cuda-compile-host-device 525 526Only compile for the offloading host. 527 528.. option:: --offload-host-only, --cuda-host-only 529 530Only compile for the offloading host. 531 532.. option:: --offload=<arg1>,<arg2>... 533 534Specify comma-separated list of offloading target triples (CUDA and HIP only) 535 536.. option:: -p, --profile 537 538.. option:: -pagezero\_size<arg> 539 540.. option:: -pg 541 542Enable mcount instrumentation 543 544.. option:: -pipe, --pipe 545 546Use pipes between commands, when possible 547 548.. option:: -prebind 549 550.. program:: clang1 551.. option:: -prebind\_all\_twolevel\_modules 552.. program:: clang 553 554.. option:: -preload 555 556.. option:: --print-diagnostic-categories 557 558.. option:: -print-diagnostic-options, --print-diagnostic-options 559 560Print all of Clang's warning options 561 562.. option:: -print-effective-triple, --print-effective-triple 563 564Print the effective target triple 565 566.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 567 568Print the full library path of <file> 569 570.. option:: -print-ivar-layout 571 572Enable Objective-C Ivar layout bitmap print trace 573 574.. option:: -print-libgcc-file-name, --print-libgcc-file-name 575 576Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 577 578.. option:: -print-multi-directory, --print-multi-directory 579 580.. option:: -print-multi-lib, --print-multi-lib 581 582.. option:: -print-multiarch, --print-multiarch 583 584Print the multiarch target triple 585 586.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 587 588Print the full program path of <name> 589 590.. option:: -print-resource-dir, --print-resource-dir 591 592Print the resource directory pathname 593 594.. option:: -print-rocm-search-dirs, --print-rocm-search-dirs 595 596Print the paths used for finding ROCm installation 597 598.. option:: -print-runtime-dir, --print-runtime-dir 599 600Print the directory pathname containing clangs runtime libraries 601 602.. option:: -print-search-dirs, --print-search-dirs 603 604Print the paths used for finding libraries and programs 605 606.. option:: -print-target-triple, --print-target-triple 607 608Print the normalized target triple 609 610.. option:: -print-targets, --print-targets 611 612Print the registered targets 613 614.. option:: -private\_bundle 615 616.. option:: --product-name=<arg> 617 618.. option:: -pthread, -no-pthread 619 620Support POSIX threads in generated code 621 622.. option:: -pthreads 623 624.. option:: -read\_only\_relocs <arg> 625 626.. option:: -relocatable-pch, --relocatable-pch 627 628Whether to build a relocatable precompiled header 629 630.. option:: -remap 631 632.. option:: -rewrite-legacy-objc 633 634Rewrite Legacy Objective-C source to C++ 635 636.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 637 638Compiler runtime library to use 639 640.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 641 642Save llvm statistics. 643 644.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 645 646Save intermediate compilation results. 647 648.. option:: -sectalign <arg1> <arg2> <arg3> 649 650.. option:: -sectcreate <arg1> <arg2> <arg3> 651 652.. option:: -sectobjectsymbols <arg1> <arg2> 653 654.. option:: -sectorder <arg1> <arg2> <arg3> 655 656.. option:: -seg1addr<arg> 657 658.. option:: -seg\_addr\_table <arg> 659 660.. program:: clang1 661.. option:: -seg\_addr\_table\_filename <arg> 662.. program:: clang 663 664.. option:: -segaddr <arg1> <arg2> 665 666.. option:: -segcreate <arg1> <arg2> <arg3> 667 668.. option:: -seglinkedit 669 670.. option:: -segprot <arg1> <arg2> <arg3> 671 672.. option:: -segs\_read\_<arg> 673 674.. program:: clang1 675.. option:: -segs\_read\_only\_addr <arg> 676.. program:: clang 677 678.. program:: clang2 679.. option:: -segs\_read\_write\_addr <arg> 680.. program:: clang 681 682.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 683 684Serialize compiler diagnostics to a file 685 686.. option:: -shared-libgcc 687 688.. option:: -shared-libsan, -shared-libasan 689 690Dynamically link the sanitizer runtime 691 692.. option:: -single\_module 693 694.. option:: --start-no-unused-arguments 695 696Don't emit warnings about unused arguments for the following arguments 697 698.. option:: -static-libgcc 699 700.. option:: -static-libsan 701 702Statically link the sanitizer runtime 703 704.. option:: -static-libstdc++ 705 706.. option:: -static-openmp 707 708Use the static host OpenMP runtime while linking. 709 710.. option:: -std-default=<arg> 711 712.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 713 714C++ standard library to use. <arg> must be 'libc++', 'libstdc++' or 'platform'. 715 716.. option:: -sub\_library<arg> 717 718.. program:: clang1 719.. option:: -sub\_umbrella<arg> 720.. program:: clang 721 722.. option:: --sysroot=<arg>, --sysroot <arg> 723 724.. option:: --target-help 725 726.. option:: --target=<arg>, -target <arg> 727 728Generate code for the given target 729 730.. option:: -time 731 732Time individual commands 733 734.. option:: -traditional, --traditional 735 736.. option:: -traditional-cpp, --traditional-cpp 737 738Enable some traditional CPP emulation 739 740.. option:: -twolevel\_namespace 741 742.. program:: clang1 743.. option:: -twolevel\_namespace\_hints 744.. program:: clang 745 746.. option:: -umbrella <arg> 747 748.. option:: -unexported\_symbols\_list <arg> 749 750.. option:: -unwindlib=<arg>, --unwindlib=<arg> 751 752Unwind library to use. <arg> must be 'libgcc', 'unwindlib' or 'platform'. 753 754.. option:: -v, --verbose 755 756Show commands to run and use verbose output 757 758.. option:: --verify-debug-info 759 760Verify the binary representation of debug output 761 762.. option:: --version 763 764Print version information 765 766.. option:: -w, --no-warnings 767 768Suppress all warnings 769 770.. option:: -weak-l<arg> 771 772.. option:: -weak\_framework <arg> 773 774.. program:: clang1 775.. option:: -weak\_library <arg> 776.. program:: clang 777 778.. program:: clang2 779.. option:: -weak\_reference\_mismatches <arg> 780.. program:: clang 781 782.. option:: -whatsloaded 783 784.. option:: -why\_load, -whyload 785 786.. option:: -working-directory<arg>, -working-directory=<arg> 787 788Resolve file paths relative to the specified directory 789 790.. option:: -x<language>, --language <arg>, --language=<arg> 791 792Treat subsequent input files as having type <language> 793 794.. option:: -y<arg> 795 796Actions 797======= 798The action to perform on the input. 799 800.. option:: -E, --preprocess 801 802Only run the preprocessor 803 804.. option:: -S, --assemble 805 806Only run preprocess and compilation steps 807 808.. option:: -c, --compile 809 810Only run preprocess, compile, and assemble steps 811 812.. option:: -emit-interface-stubs 813 814Generate Interface Stub Files. 815 816.. option:: -emit-llvm 817 818Use the LLVM representation for assembler and object files 819 820.. option:: -emit-merged-ifs 821 822Generate Interface Stub Files, emit merged text not binary. 823 824.. option:: -extract-api 825 826Extract API information 827 828.. option:: -fdriver-only 829 830Only run the driver. 831 832.. option:: -fsyntax-only 833 834.. option:: -module-file-info 835 836Provide information about a particular module file 837 838.. option:: --precompile 839 840Only precompile the input 841 842.. option:: -rewrite-objc 843 844Rewrite Objective-C source to C++ 845 846.. option:: -verify-pch 847 848Load and verify that a pre-compiled header file is not stale 849 850Compilation flags 851================= 852 853Flags controlling the behavior of Clang during compilation. These flags have 854no effect during actions that do not perform compilation. 855 856.. option:: -Xassembler <arg> 857 858Pass <arg> to the assembler 859 860.. option:: -Xclang <arg> 861 862Pass <arg> to the clang compiler 863 864.. option:: -Xopenmp-target <arg> 865 866Pass <arg> to the target offloading toolchain. 867 868.. program:: clang1 869.. option:: -Xopenmp-target=<triple> <arg> 870.. program:: clang 871 872Pass <arg> to the target offloading toolchain identified by <triple>. 873 874.. option:: -ansi, --ansi 875 876.. option:: -fc++-abi=<arg> 877 878C++ ABI to use. This will override the target C++ ABI. 879 880.. option:: -fclang-abi-compat=<version> 881 882Attempt to match the ABI of Clang <version>. <version> must be '<major>.<minor>' or 'latest'. 883 884.. option:: -fcomment-block-commands=<arg>,<arg2>... 885 886Treat each comma separated argument in <arg> as a documentation comment block command 887 888.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 889 890Require member pointer base types to be complete if they would be significant under the Microsoft ABI 891 892.. option:: -fcrash-diagnostics-dir=<dir> 893 894Put crash-report files in <dir> 895 896.. option:: -fdeclspec, -fno-declspec 897 898Allow \_\_declspec as a keyword 899 900.. option:: -fdepfile-entry=<arg> 901 902.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 903 904.. option:: -fdiagnostics-format=<arg> 905 906.. option:: -fdiagnostics-parseable-fixits 907 908Print fix-its in machine parseable form 909 910.. option:: -fdiagnostics-print-source-range-info 911 912Print source range spans in numeric form 913 914.. option:: -fdiagnostics-show-category=<arg> 915 916.. option:: -fdiscard-value-names, -fno-discard-value-names 917 918Discard value names in LLVM IR 919 920.. option:: -fexperimental-relative-c++-abi-vtables, -fno-experimental-relative-c++-abi-vtables 921 922Use the experimental C++ class ABI for classes with virtual tables 923 924.. option:: -fexperimental-strict-floating-point 925 926Enables experimental strict floating point in LLVM. 927 928.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 929 930Use separate accesses for consecutive bitfield runs with legal widths and alignments. 931 932.. option:: -fglobal-isel, -fexperimental-isel, -fno-global-isel 933 934Enables the global instruction selector 935 936.. option:: -finline-functions, -fno-inline-functions 937 938Inline suitable functions 939 940.. option:: -finline-hint-functions 941 942Inline functions which are (explicitly or implicitly) marked inline 943 944.. option:: -fno-legacy-pass-manager, -fexperimental-new-pass-manager 945 946.. option:: -fno-sanitize-ignorelist, -fno-sanitize-blacklist 947 948Don't use ignorelist file for sanitizers 949 950.. option:: -fparse-all-comments 951 952.. option:: -frandomize-layout-seed-file=<file> 953 954File holding the seed used by the randomize structure layout feature 955 956.. option:: -frandomize-layout-seed=<seed> 957 958The seed used by the randomize structure layout feature 959 960.. option:: -frecord-command-line, -fno-record-command-line, -frecord-gcc-switches 961 962.. option:: -fsanitize-address-destructor=<arg> 963 964Set destructor type used in ASan instrumentation. <arg> must be 'none' or 'global'. 965 966.. option:: -fsanitize-address-field-padding=<arg> 967 968Level of field padding for AddressSanitizer 969 970.. option:: -fsanitize-address-globals-dead-stripping, -fno-sanitize-address-globals-dead-stripping 971 972Enable linker dead stripping of globals in AddressSanitizer 973 974.. option:: -fsanitize-address-outline-instrumentation, -fno-sanitize-address-outline-instrumentation 975 976Always generate function calls for address sanitizer instrumentation 977 978.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 979 980Enable poisoning array cookies when using custom operator new\[\] in AddressSanitizer 981 982.. option:: -fsanitize-address-use-after-return=<mode> 983 984Select the mode of detecting stack use-after-return in AddressSanitizer. <mode> must be 'never', 'runtime' or 'always'. 985 986.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 987 988Enable use-after-scope detection in AddressSanitizer 989 990.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 991 992Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 993 994.. option:: -fsanitize-cfi-canonical-jump-tables, -fno-sanitize-cfi-canonical-jump-tables 995 996Make the jump table addresses canonical in the symbol table 997 998.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 999 1000Enable control flow integrity (CFI) checks for cross-DSO calls. 1001 1002.. option:: -fsanitize-cfi-icall-generalize-pointers 1003 1004Generalize pointers in CFI indirect call type signature checks 1005 1006.. option:: -fsanitize-coverage-allowlist=<arg>, -fsanitize-coverage-whitelist=<arg> 1007 1008Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones 1009 1010.. option:: -fsanitize-coverage-ignorelist=<arg>, -fsanitize-coverage-blacklist=<arg> 1011 1012Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones 1013 1014.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 1015 1016Specify the type of coverage instrumentation for Sanitizers 1017 1018.. option:: -fsanitize-hwaddress-abi=<arg> 1019 1020Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused. 1021 1022.. option:: -fsanitize-hwaddress-experimental-aliasing, -fno-sanitize-hwaddress-experimental-aliasing 1023 1024Enable aliasing mode in HWAddressSanitizer 1025 1026.. option:: -fsanitize-ignorelist=<arg>, -fsanitize-blacklist=<arg> 1027 1028Path to ignorelist file for sanitizers 1029 1030.. option:: -fsanitize-link-c++-runtime, -fno-sanitize-link-c++-runtime 1031 1032.. option:: -fsanitize-link-runtime, -fno-sanitize-link-runtime 1033 1034.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 1035 1036Enable origins tracking in MemorySanitizer 1037 1038.. program:: clang1 1039.. option:: -fsanitize-memory-track-origins=<arg> 1040.. program:: clang 1041 1042Enable origins tracking in MemorySanitizer 1043 1044.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 1045 1046Enable use-after-destroy detection in MemorySanitizer 1047 1048.. option:: -fsanitize-memtag-mode=<arg> 1049 1050Set default MTE mode to 'sync' (default) or 'async' 1051 1052.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 1053 1054.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>..., -fsanitize-recover (equivalent to -fsanitize-recover=all) 1055 1056Enable recovery for specified sanitizers 1057 1058.. option:: -fsanitize-stats, -fno-sanitize-stats 1059 1060Enable sanitizer statistics gathering. 1061 1062.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 1063 1064Enable atomic operations instrumentation in ThreadSanitizer (default) 1065 1066.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 1067 1068Enable function entry/exit instrumentation in ThreadSanitizer (default) 1069 1070.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 1071 1072Enable memory access instrumentation in ThreadSanitizer (default) 1073 1074.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>..., -fsanitize-trap (equivalent to -fsanitize-trap=all), -fsanitize-undefined-trap-on-error (equivalent to -fsanitize-trap=undefined) 1075 1076Enable trapping for specified sanitizers 1077 1078.. option:: -fsanitize-undefined-strip-path-components=<number> 1079 1080Strip (or keep only, if negative) a given number of path components when emitting check metadata. 1081 1082.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 1083 1084Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 1085 1086.. option:: -moutline, -mno-outline 1087 1088Enable function outlining (AArch64 only) 1089 1090.. option:: -moutline-atomics, -mno-outline-atomics 1091 1092Generate local calls to out-of-line atomic operations 1093 1094.. option:: --param <arg>, --param=<arg> 1095 1096.. option:: -print-supported-cpus, --print-supported-cpus, -mcpu=?, -mtune=? 1097 1098Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target) 1099 1100.. option:: -std=<arg>, --std=<arg>, --std <arg> 1101 1102Language standard to compile for 1103 1104Preprocessor flags 1105~~~~~~~~~~~~~~~~~~ 1106 1107Flags controlling the behavior of the Clang preprocessor. 1108 1109.. option:: -C, --comments 1110 1111Include comments in preprocessed output 1112 1113.. option:: -CC, --comments-in-macros 1114 1115Include comments from within macros in preprocessed output 1116 1117.. program:: clang2 1118.. option:: -D<macro>=<value>, --D<arg>, /D<arg>, -D<arg>, --define-macro <arg>, --define-macro=<arg> 1119.. program:: clang 1120 1121Define <macro> to <value> (or 1 if <value> omitted) 1122 1123.. option:: -H, --trace-includes 1124 1125Show header includes and nesting depth 1126 1127.. option:: -P, --no-line-commands 1128 1129Disable linemarker output in -E mode 1130 1131.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 1132 1133Undefine macro <macro> 1134 1135.. option:: -Wp,<arg>,<arg2>... 1136 1137Pass the comma separated arguments in <arg> to the preprocessor 1138 1139.. option:: -Xpreprocessor <arg> 1140 1141Pass <arg> to the preprocessor 1142 1143Include path management 1144----------------------- 1145 1146Flags controlling how ``#include``\s are resolved to files. 1147 1148.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 1149 1150Add directory to include search path. For C++ inputs, if 1151there are multiple -I options, these directories are searched 1152in the order they are given before the standard system directories 1153are searched. If the same directory is in the SYSTEM include search 1154paths, for example if also specified with -isystem, the -I option 1155will be ignored 1156 1157.. option:: -I-, --include-barrier 1158 1159Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 1160 1161.. option:: --amdgpu-arch-tool=<arg> 1162 1163Tool used for detecting AMD GPU arch in the system. 1164 1165.. option:: --cuda-path-ignore-env 1166 1167Ignore environment variables to detect CUDA installation 1168 1169.. option:: --cuda-path=<arg> 1170 1171CUDA installation path 1172 1173.. option:: -cxx-isystem<directory> 1174 1175Add directory to the C++ SYSTEM include search path 1176 1177.. option:: -fbuild-session-file=<file> 1178 1179Use the last modification time of <file> as the build session timestamp 1180 1181.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 1182 1183Time when the current build session started 1184 1185.. option:: -fmodule-file=\[<name>=\]<file> 1186 1187Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 1188 1189.. option:: -fmodules-cache-path=<directory> 1190 1191Specify the module cache path 1192 1193.. option:: -fmodules-disable-diagnostic-validation 1194 1195Disable validation of the diagnostic options when loading the module 1196 1197.. option:: -fmodules-prune-after=<seconds> 1198 1199Specify the interval (in seconds) after which a module file will be considered unused 1200 1201.. option:: -fmodules-prune-interval=<seconds> 1202 1203Specify the interval (in seconds) between attempts to prune the module cache 1204 1205.. option:: -fmodules-user-build-path <directory> 1206 1207Specify the module user build path 1208 1209.. option:: -fmodules-validate-once-per-build-session 1210 1211Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 1212 1213.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 1214 1215Validate the system headers that a module depends on when loading the module 1216 1217.. option:: -fprebuilt-module-path=<directory> 1218 1219Specify the prebuilt module path 1220 1221.. option:: --hip-path=<arg> 1222 1223HIP runtime installation path, used for finding HIP version and adding HIP include path. 1224 1225.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1226 1227Add directory to AFTER include search path 1228 1229.. option:: -iframework<arg> 1230 1231Add directory to SYSTEM framework search path 1232 1233.. option:: -iframeworkwithsysroot<directory> 1234 1235Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1236 1237.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1238 1239Include macros from file before parsing 1240 1241.. option:: -include<file>, --include<file>, --include=<arg> 1242 1243Include file before parsing 1244 1245.. option:: -include-pch <file> 1246 1247Include precompiled header file 1248 1249.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1250 1251Set the -iwithprefix/-iwithprefixbefore prefix 1252 1253.. option:: -iquote<directory> 1254 1255Add directory to QUOTE include search path 1256 1257.. option:: -isysroot<dir> 1258 1259Set the system root directory (usually /) 1260 1261.. option:: -isystem<directory> 1262 1263Add directory to SYSTEM include search path 1264 1265.. option:: -isystem-after<directory> 1266 1267Add directory to end of the SYSTEM include search path 1268 1269.. option:: -ivfsoverlay<arg> 1270 1271Overlay the virtual filesystem described by file over the real file system 1272 1273.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1274 1275Set directory to SYSTEM include search path with prefix 1276 1277.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1278 1279Set directory to include search path with prefix 1280 1281.. option:: -iwithsysroot<directory> 1282 1283Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1284 1285.. option:: --libomptarget-amdgpu-bc-path=<arg>, --libomptarget-amdgcn-bc-path=<arg> 1286 1287Path to libomptarget-amdgcn bitcode library 1288 1289.. option:: --libomptarget-nvptx-bc-path=<arg> 1290 1291Path to libomptarget-nvptx bitcode library 1292 1293.. option:: --ptxas-path=<arg> 1294 1295Path to ptxas (used for compiling CUDA code) 1296 1297.. option:: --rocm-path=<arg> 1298 1299ROCm installation path, used for finding and automatically linking required bitcode libraries. 1300 1301.. program:: clang1 1302.. option:: -stdlib++-isystem<directory> 1303.. program:: clang 1304 1305Use directory as the C++ standard library include path 1306 1307.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1308 1309Treat all #include paths starting with <prefix> as including a system header. 1310 1311Dependency file generation 1312-------------------------- 1313 1314Flags controlling generation of a dependency file for ``make``-like build 1315systems. 1316 1317.. option:: -M, --dependencies 1318 1319Like -MD, but also implies -E and writes to stdout by default 1320 1321.. option:: -MD, --write-dependencies 1322 1323Write a depfile containing user and system headers 1324 1325.. option:: -MF<file> 1326 1327Write depfile output from -MMD, -MD, -MM, or -M to <file> 1328 1329.. option:: -MG, --print-missing-file-dependencies 1330 1331Add missing headers to depfile 1332 1333.. option:: -MJ<arg> 1334 1335Write a compilation database entry per input 1336 1337.. option:: -MM, --user-dependencies 1338 1339Like -MMD, but also implies -E and writes to stdout by default 1340 1341.. option:: -MMD, --write-user-dependencies 1342 1343Write a depfile containing user headers 1344 1345.. option:: -MP 1346 1347Create phony target for each dependency (other than main file) 1348 1349.. option:: -MQ<arg> 1350 1351Specify name of main file output to quote in depfile 1352 1353.. option:: -MT<arg> 1354 1355Specify name of main file output in depfile 1356 1357.. option:: -MV 1358 1359Use NMake/Jom format for the depfile 1360 1361Dumping preprocessor state 1362-------------------------- 1363 1364Flags allowing the state of the preprocessor to be dumped in various ways. 1365 1366.. option:: -d 1367 1368.. program:: clang1 1369.. option:: -d<arg> 1370.. program:: clang 1371 1372.. option:: -dD 1373 1374Print macro definitions in -E mode in addition to normal output 1375 1376.. option:: -dI 1377 1378Print include directives in -E mode in addition to normal output 1379 1380.. option:: -dM 1381 1382Print macro definitions in -E mode instead of normal output 1383 1384Diagnostic flags 1385~~~~~~~~~~~~~~~~ 1386 1387Flags controlling which warnings, errors, and remarks Clang will generate. 1388See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1389 1390.. option:: -R<remark> 1391 1392Enable the specified remark 1393 1394.. option:: -Rpass-analysis=<arg> 1395 1396Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1397 1398.. option:: -Rpass-missed=<arg> 1399 1400Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1401 1402.. option:: -Rpass=<arg> 1403 1404Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1405 1406.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1407 1408Enable the specified warning 1409 1410.. option:: -Wdeprecated, -Wno-deprecated 1411 1412Enable warnings for deprecated constructs and define \_\_DEPRECATED 1413 1414.. option:: -Wframe-larger-than=<arg>, -Wframe-larger-than 1415 1416.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1417 1418Target-independent compilation options 1419~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1420.. option:: -fPIC, -fno-PIC 1421 1422.. option:: -fPIE, -fno-PIE 1423 1424.. option:: -faccess-control, -fno-access-control 1425 1426.. option:: -faddrsig, -fno-addrsig 1427 1428Emit an address-significance table 1429 1430.. option:: -falign-functions, -fno-align-functions 1431 1432.. program:: clang1 1433.. option:: -falign-functions=<arg> 1434.. program:: clang 1435 1436.. option:: -falign-loops=<N> 1437 1438N must be a power of two. Align loops to the boundary 1439 1440.. program:: clang1 1441.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1442.. program:: clang 1443 1444Enable C++17 aligned allocation functions 1445 1446.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1447 1448Treat editor placeholders as valid source code 1449 1450.. option:: -fallow-unsupported 1451 1452.. option:: -faltivec, -fno-altivec 1453 1454.. option:: -faltivec-src-compat=<arg> 1455 1456Source-level compatibility for Altivec vectors (for PowerPC targets). This includes results of vector comparison (scalar for 'xl', vector for 'gcc') as well as behavior when initializing with a scalar (splatting for 'xl', element zero only for 'gcc'). For 'mixed', the compatibility is as 'gcc' for 'vector bool/vector pixel' and as 'xl' for other types. Current default is 'mixed'. <arg> must be 'mixed', 'gcc' or 'xl'. 1457 1458.. option:: -fansi-escape-codes 1459 1460Use ANSI escape codes for diagnostics 1461 1462.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1463 1464Use Apple's kernel extensions ABI 1465 1466.. option:: -fapple-link-rtlib 1467 1468Force linking the clang builtins runtime library 1469 1470.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1471 1472Enable Apple gcc-compatible #pragma pack handling 1473 1474.. option:: -fapplication-extension, -fno-application-extension 1475 1476Restrict code to those available for App Extensions 1477 1478.. option:: -fapprox-func, -fno-approx-func 1479 1480Allow certain math function calls to be replaced with an approximately equivalent calculation 1481 1482.. option:: -fasm, -fno-asm 1483 1484.. option:: -fasm-blocks, -fno-asm-blocks 1485 1486.. option:: -fassociative-math, -fno-associative-math 1487 1488.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1489 1490.. option:: -fast 1491 1492.. option:: -fastcp 1493 1494.. option:: -fastf 1495 1496.. option:: -fasync-exceptions, -fno-async-exceptions 1497 1498Enable EH Asynchronous exceptions 1499 1500.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1501 1502.. option:: -fautolink, -fno-autolink 1503 1504.. option:: -fbasic-block-sections=<arg> 1505 1506Generate labels for each basic block or place each basic block or a subset of basic blocks in its own section. <arg> must be 'all', 'labels', 'none' or 'list='. 1507 1508.. option:: -fbinutils-version=<major.minor> 1509 1510Produced object files can use all ELF features supported by this binutils version and newer. If -fno-integrated-as is specified, the generated assembly will consider GNU as support. 'none' means that all ELF features can be used, regardless of binutils support. Defaults to 2.26. 1511 1512.. option:: -fblocks, -fno-blocks 1513 1514Enable the 'blocks' language feature 1515 1516.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1517 1518.. option:: -fborland-extensions, -fno-borland-extensions 1519 1520Accept non-standard constructs supported by the Borland compiler 1521 1522.. option:: -fbracket-depth=<arg> 1523 1524.. option:: -fbuiltin, -fno-builtin 1525 1526.. option:: -fbuiltin-module-map 1527 1528Load the clang builtins module map file. 1529 1530.. program:: clang1 1531.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1532.. program:: clang 1533 1534.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1535 1536.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1537 1538Instrument control-flow architecture protection. <arg> must be 'return', 'branch', 'full' or 'none'. 1539 1540.. option:: -fcf-runtime-abi=<arg> 1541 1542 <arg> must be 'unspecified', 'standalone', 'objc', 'swift', 'swift-5.0', 'swift-4.2' or 'swift-4.1'. 1543 1544.. option:: -fchar8\_t, -fno-char8\_t 1545 1546Enable C++ builtin type char8\_t 1547 1548.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1549 1550.. option:: -fcolor-diagnostics, -fdiagnostics-color, -fno-color-diagnostics 1551 1552Enable colors in diagnostics 1553 1554.. option:: -fcommon, -fno-common 1555 1556Place uninitialized global variables in a common block 1557 1558.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1559 1560.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1561 1562.. option:: -fconstant-string-class=<arg> 1563 1564.. option:: -fconstexpr-backtrace-limit=<arg> 1565 1566.. option:: -fconstexpr-depth=<arg> 1567 1568.. option:: -fconstexpr-steps=<arg> 1569 1570.. option:: -fconvergent-functions 1571 1572Assume functions may be convergent 1573 1574.. option:: -fcoroutines-ts, -fno-coroutines-ts 1575 1576Enable support for the C++ Coroutines TS 1577 1578.. option:: -fcoverage-compilation-dir=<arg> 1579 1580The compilation directory to embed in the coverage mapping. 1581 1582.. option:: -fcoverage-mapping, -fno-coverage-mapping 1583 1584Generate coverage mapping to enable code coverage analysis 1585 1586.. option:: -fcoverage-prefix-map=<arg> 1587 1588remap file source paths in coverage mapping 1589 1590.. option:: -fcreate-profile 1591 1592.. option:: -fcs-profile-generate 1593 1594Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1595 1596.. program:: clang1 1597.. option:: -fcs-profile-generate=<directory> 1598.. program:: clang 1599 1600Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1601 1602.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 1603 1604Use approximate transcendental functions 1605 1606.. option:: -fcuda-short-ptr, -fno-cuda-short-ptr 1607 1608Use 32-bit pointers for accessing const/local/shared address spaces 1609 1610.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1611 1612Enable C++ exceptions 1613 1614.. option:: -fcxx-modules, -fno-cxx-modules 1615 1616Enable modules for C++ 1617 1618.. option:: -fdata-sections, -fno-data-sections 1619 1620Place each data in its own section 1621 1622.. option:: -fdebug-compilation-dir=<arg>, -fdebug-compilation-dir <arg> 1623 1624The compilation directory to embed in the debug info 1625 1626.. option:: -fdebug-default-version=<arg> 1627 1628Default DWARF version to use, if a -g option caused DWARF debug info to be produced 1629 1630.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1631 1632Emit extra debug info to make sample profile more accurate 1633 1634.. option:: -fdebug-macro, -fno-debug-macro 1635 1636Emit macro debug information 1637 1638.. option:: -fdebug-pass-arguments 1639 1640.. option:: -fdebug-pass-structure 1641 1642.. option:: -fdebug-prefix-map=<arg> 1643 1644remap file source paths in debug info 1645 1646.. option:: -fdebug-ranges-base-address, -fno-debug-ranges-base-address 1647 1648Use DWARF base address selection entries in .debug\_ranges 1649 1650.. option:: -fdebug-types-section, -fno-debug-types-section 1651 1652Place debug types in their own section (ELF Only) 1653 1654.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1655 1656Parse templated function definitions at the end of the translation unit 1657 1658.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1659 1660Treat usage of null pointers as undefined behavior (default) 1661 1662.. option:: -fdenormal-fp-math=<arg> 1663 1664.. option:: -fdiagnostics-absolute-paths 1665 1666Print absolute paths in diagnostics 1667 1668.. program:: clang1 1669.. option:: -fdiagnostics-color=<arg> 1670.. program:: clang 1671 1672.. option:: -fdiagnostics-hotness-threshold=<value> 1673 1674Prevent optimization remarks from being output if they do not have at least this profile count. Use 'auto' to apply the threshold from profile summary 1675 1676.. option:: -fdiagnostics-misexpect-tolerance=<value> 1677 1678Prevent misexpect diagnostics from being output if the profile counts are within N% of the expected. 1679 1680.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1681 1682Enable profile hotness information in diagnostic line 1683 1684.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1685 1686Display include stacks for diagnostic notes 1687 1688.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1689 1690Print option name with mappable diagnostics 1691 1692.. option:: -fdiagnostics-show-template-tree 1693 1694Print a template comparison tree for differing templates 1695 1696.. option:: -fdigraphs, -fno-digraphs 1697 1698Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1699 1700.. option:: -fdirect-access-external-data, -fno-direct-access-external-data 1701 1702Don't use GOT indirection to reference external data symbols 1703 1704.. option:: -fdirectives-only, -fno-directives-only 1705 1706.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1707 1708Allow '$' in identifiers 1709 1710.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1711 1712Enable '\[\[\]\]' attributes in all C and C++ language modes 1713 1714.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1715 1716.. option:: -fdwarf-exceptions 1717 1718Use DWARF style exceptions 1719 1720.. option:: -felide-constructors, -fno-elide-constructors 1721 1722.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1723 1724.. option:: -feliminate-unused-debug-types, -fno-eliminate-unused-debug-types 1725 1726Do not emit debug info for defined but unused types 1727 1728.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1729 1730Embed LLVM bitcode. <option> must be 'off', 'all', 'bitcode' or 'marker'. 1731 1732.. option:: -fembed-offload-object=<arg> 1733 1734Embed Offloading device-side binary into host object file as a section. 1735 1736.. option:: -femit-all-decls 1737 1738Emit all declarations, even if unused 1739 1740.. option:: -femit-dwarf-unwind=<arg> 1741 1742When to emit DWARF unwind (EH frame) info. <arg> must be 'always', 'no-compact-unwind' or 'default'. 1743 1744.. option:: -femulated-tls, -fno-emulated-tls 1745 1746Use emutls functions to access thread\_local variables 1747 1748.. option:: -fenable-matrix 1749 1750Enable matrix data type and related builtin functions 1751 1752.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1753 1754.. option:: -ferror-limit=<arg> 1755 1756.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1757 1758.. option:: -fexceptions, -fno-exceptions 1759 1760Enable support for exception handling 1761 1762.. option:: -fexec-charset=<arg> 1763 1764.. option:: -fexperimental-new-constant-interpreter 1765 1766Enable the experimental new constant interpreter 1767 1768.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1769 1770.. option:: -fextend-arguments=<arg> 1771 1772Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions. <arg> must be '32' or '64'. 1773 1774.. option:: -ffast-math, -fno-fast-math 1775 1776Allow aggressive, lossy floating-point optimizations 1777 1778.. option:: -ffile-compilation-dir=<arg> 1779 1780The compilation directory to embed in the debug info and coverage mapping. 1781 1782.. option:: -ffile-prefix-map=<arg> 1783 1784remap file source paths in debug info, predefined preprocessor macros and \_\_builtin\_FILE(). Implies -ffile-reproducible. 1785 1786.. option:: -ffile-reproducible, -fno-file-reproducible 1787 1788Use the target's platform-specific path separator character when expanding the \_\_FILE\_\_ macro 1789 1790.. option:: -ffinite-loops, -fno-finite-loops 1791 1792Assume all loops are finite. 1793 1794.. option:: -ffinite-math-only, -fno-finite-math-only 1795 1796.. option:: -ffixed-point, -fno-fixed-point 1797 1798Enable fixed point types 1799 1800.. option:: -ffor-scope, -fno-for-scope 1801 1802.. option:: -fforce-dwarf-frame, -fno-force-dwarf-frame 1803 1804Always emit a debug frame section 1805 1806.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1807 1808Emits more virtual tables to improve devirtualization 1809 1810.. option:: -fforce-enable-int128, -fno-force-enable-int128 1811 1812Enable support for int128\_t type 1813 1814.. option:: -ffp-contract=<arg> 1815 1816Form fused FP ops (e.g. FMAs): fast (fuses across statements disregarding pragmas) \| on (only fuses in the same statement unless dictated by pragmas) \| off (never fuses) \| fast-honor-pragmas (fuses across statements unless diectated by pragmas). Default is 'fast' for CUDA, 'fast-honor-pragmas' for HIP, and 'on' otherwise. <arg> must be 'fast', 'on', 'off' or 'fast-honor-pragmas'. 1817 1818.. option:: -ffp-eval-method=<arg> 1819 1820Specifies the evaluation method to use for floating-point arithmetic. <arg> must be 'source', 'double' or 'extended'. 1821 1822.. option:: -ffp-exception-behavior=<arg> 1823 1824Specifies the exception behavior of floating-point operations. <arg> must be 'ignore', 'maytrap' or 'strict'. 1825 1826.. option:: -ffp-model=<arg> 1827 1828Controls the semantics of floating-point calculations. 1829 1830.. option:: -ffreestanding 1831 1832Assert that the compilation takes place in a freestanding environment 1833 1834.. option:: -ffunction-sections, -fno-function-sections 1835 1836Place each function in its own section 1837 1838.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1839 1840.. option:: -fgnu-keywords, -fno-gnu-keywords 1841 1842Allow GNU-extension keywords regardless of language standard 1843 1844.. option:: -fgnu-runtime 1845 1846Generate output compatible with the standard GNU Objective-C runtime 1847 1848.. option:: -fgnu89-inline, -fno-gnu89-inline 1849 1850Use the gnu89 inline semantics 1851 1852.. option:: -fgnuc-version=<arg> 1853 1854Sets various macros to claim compatibility with the given GCC version (default is 4.2.1) 1855 1856.. option:: -fgpu-allow-device-init, -fno-gpu-allow-device-init 1857 1858Allow device side init function in HIP (experimental) 1859 1860.. option:: -fgpu-defer-diag, -fno-gpu-defer-diag 1861 1862Defer host/device related diagnostic messages for CUDA/HIP 1863 1864.. option:: -fgpu-rdc, -fcuda-rdc, -fno-gpu-rdc 1865 1866Generate relocatable device code, also known as separate compilation mode 1867 1868.. option:: -fgpu-sanitize, -fno-gpu-sanitize 1869 1870Enable sanitizer for AMDGPU target 1871 1872.. option:: -fhip-fp32-correctly-rounded-divide-sqrt, -fno-hip-fp32-correctly-rounded-divide-sqrt 1873 1874Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only) 1875 1876.. option:: -fhip-kernel-arg-name, -fno-hip-kernel-arg-name 1877 1878Specify that kernel argument names are preserved (HIP only) 1879 1880.. option:: -fhip-new-launch-api, -fno-hip-new-launch-api 1881 1882Use new kernel launching API for HIP 1883 1884.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1885 1886.. option:: -fhonor-nans, -fno-honor-nans 1887 1888.. option:: -fhosted 1889 1890.. option:: -fignore-exceptions 1891 1892Enable support for ignoring exception handling constructs 1893 1894.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1895 1896Implicitly search the file system for module map files. 1897 1898.. option:: -fimplicit-modules, -fno-implicit-modules 1899 1900.. option:: -finput-charset=<arg> 1901 1902Specify the default character set for source files 1903 1904.. option:: -finstrument-function-entry-bare 1905 1906Instrument function entry only, after inlining, without arguments to the instrumentation call 1907 1908.. option:: -finstrument-functions 1909 1910Generate calls to instrument function entry and exit 1911 1912.. option:: -finstrument-functions-after-inlining 1913 1914Like -finstrument-functions, but insert the calls after inlining 1915 1916.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1917 1918Enable the integrated assembler 1919 1920.. option:: -fintegrated-cc1, -fno-integrated-cc1 1921 1922Run cc1 in-process 1923 1924.. option:: -fintegrated-objemitter, -fno-integrated-objemitter 1925 1926Use internal machine object code emitter. 1927 1928.. option:: -fjmc, -fno-jmc 1929 1930Enable just-my-code debugging 1931 1932.. option:: -fjump-tables, -fno-jump-tables 1933 1934Use jump tables for lowering switches 1935 1936.. option:: -fkeep-static-consts, -fno-keep-static-consts 1937 1938Keep static const variables if unused 1939 1940.. option:: -flax-vector-conversions=<arg>, -flax-vector-conversions (equivalent to -flax-vector-conversions=integer), -fno-lax-vector-conversions (equivalent to -flax-vector-conversions=none) 1941 1942Enable implicit vector bit-casts. <arg> must be 'none', 'integer' or 'all'. 1943 1944.. option:: -flimited-precision=<arg> 1945 1946.. option:: -flto-jobs=<arg> 1947 1948Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1949 1950.. option:: -flto=<arg>, -flto (equivalent to -flto=full), -flto=auto (equivalent to -flto=full), -flto=jobserver (equivalent to -flto=full) 1951 1952Set LTO mode. <arg> must be 'thin' or 'full'. 1953 1954.. option:: -fmacro-backtrace-limit=<arg> 1955 1956.. option:: -fmacro-prefix-map=<arg> 1957 1958remap file source paths in predefined preprocessor macros and \_\_builtin\_FILE(). Implies -ffile-reproducible. 1959 1960.. option:: -fmath-errno, -fno-math-errno 1961 1962Require math functions to indicate errors by setting errno 1963 1964.. option:: -fmax-tokens=<arg> 1965 1966Max total number of preprocessed tokens for -Wmax-tokens. 1967 1968.. option:: -fmax-type-align=<arg> 1969 1970Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1971 1972.. option:: -fmemory-profile, -fno-memory-profile 1973 1974Enable heap memory profiling 1975 1976.. program:: clang1 1977.. option:: -fmemory-profile=<directory> 1978.. program:: clang 1979 1980Enable heap memory profiling and dump results into <directory> 1981 1982.. option:: -fmerge-all-constants, -fno-merge-all-constants 1983 1984Allow merging of constants 1985 1986.. option:: -fmessage-length=<arg> 1987 1988Format message diagnostics so that they fit within N columns 1989 1990.. option:: -fminimize-whitespace, -fno-minimize-whitespace 1991 1992Minimize whitespace when emitting preprocessor output 1993 1994.. option:: -fmodule-file-deps, -fno-module-file-deps 1995 1996.. option:: -fmodule-header 1997 1998Build a C++20 Header Unit from a header. 1999 2000.. program:: clang1 2001.. option:: -fmodule-header=<kind> 2002.. program:: clang 2003 2004Build a C++20 Header Unit from a header that should be found in the user (fmodule-header=user) or system (fmodule-header=system) search path. 2005 2006.. option:: -fmodule-map-file=<file> 2007 2008Load this module map file 2009 2010.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg> 2011 2012Specify the name of the module to build 2013 2014.. option:: -fmodules, -fno-modules 2015 2016Enable the 'modules' language feature 2017 2018.. option:: -fmodules-decluse, -fno-modules-decluse 2019 2020Require declaration of modules used within a module 2021 2022.. option:: -fmodules-ignore-macro=<arg> 2023 2024Ignore the definition of the given macro when building and loading modules 2025 2026.. option:: -fmodules-search-all, -fno-modules-search-all 2027 2028Search even non-imported modules to resolve references 2029 2030.. option:: -fmodules-strict-decluse 2031 2032Like -fmodules-decluse but requires all headers to be in modules 2033 2034.. option:: -fmodules-ts 2035 2036Enable support for the C++ Modules TS 2037 2038.. option:: -fmodules-validate-input-files-content 2039 2040Validate PCM input files based on content if mtime differs 2041 2042.. option:: -fms-compatibility, -fno-ms-compatibility 2043 2044Enable full Microsoft Visual C++ compatibility 2045 2046.. option:: -fms-compatibility-version=<arg> 2047 2048Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 2049 2050.. option:: -fms-extensions, -fno-ms-extensions 2051 2052Accept some non-standard constructs supported by the Microsoft compiler 2053 2054.. option:: -fms-hotpatch 2055 2056Ensure that all functions can be hotpatched at runtime 2057 2058.. option:: -fms-memptr-rep=<arg> 2059 2060 <arg> must be 'single', 'multiple' or 'virtual'. 2061 2062.. option:: -fms-volatile 2063 2064.. option:: -fmsc-version=<arg> 2065 2066Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 2067 2068.. option:: -fmudflap 2069 2070.. option:: -fmudflapth 2071 2072.. option:: -fnested-functions 2073 2074.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 2075 2076Specifies the largest alignment guaranteed by '::operator new(size\_t)' 2077 2078.. option:: -fnew-infallible, -fno-new-infallible 2079 2080Enable treating throwing global C++ operator new as always returning valid memory (annotates with \_\_attribute\_\_((returns\_nonnull)) and throw()). This is detectable in source. 2081 2082.. option:: -fnext-runtime 2083 2084.. option:: -fno-builtin-<arg> 2085 2086Disable implicit builtin knowledge of a specific function 2087 2088.. option:: -fno-elide-type 2089 2090Do not elide types when printing diagnostics 2091 2092.. option:: -fno-knr-functions 2093 2094Disable support for K&R C function declarations 2095 2096.. option:: -fno-max-type-align 2097 2098.. option:: -fno-strict-modules-decluse 2099 2100.. option:: -fno-temp-file 2101 2102Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes 2103 2104.. option:: -fno-working-directory 2105 2106.. option:: -fno\_modules-validate-input-files-content 2107 2108.. program:: clang1 2109.. option:: -fno\_pch-validate-input-files-content 2110.. program:: clang 2111 2112.. option:: -fnoxray-link-deps 2113 2114.. option:: -fobjc-abi-version=<arg> 2115 2116.. option:: -fobjc-arc, -fno-objc-arc 2117 2118Synthesize retain and release calls for Objective-C pointers 2119 2120.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 2121 2122Use EH-safe code when synthesizing retains and releases in -fobjc-arc 2123 2124.. option:: -fobjc-convert-messages-to-runtime-calls, -fno-objc-convert-messages-to-runtime-calls 2125 2126.. option:: -fobjc-disable-direct-methods-for-testing 2127 2128Ignore attribute objc\_direct so that direct methods can be tested 2129 2130.. option:: -fobjc-encode-cxx-class-template-spec, -fno-objc-encode-cxx-class-template-spec 2131 2132Fully encode c++ class template specialization 2133 2134.. option:: -fobjc-exceptions, -fno-objc-exceptions 2135 2136Enable Objective-C exceptions 2137 2138.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 2139 2140.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 2141 2142.. option:: -fobjc-link-runtime 2143 2144.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 2145 2146.. option:: -fobjc-nonfragile-abi-version=<arg> 2147 2148.. option:: -fobjc-runtime=<arg> 2149 2150Specify the target Objective-C runtime kind and version 2151 2152.. option:: -fobjc-sender-dependent-dispatch 2153 2154.. option:: -fobjc-weak, -fno-objc-weak 2155 2156Enable ARC-style weak references in Objective-C 2157 2158.. option:: -foffload-lto=<arg>, -foffload-lto (equivalent to -foffload-lto=full) 2159 2160Set LTO mode for offload compilation. <arg> must be 'thin' or 'full'. 2161 2162.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 2163 2164.. option:: -fopenmp, -fno-openmp 2165 2166Parse OpenMP pragmas and generate parallel code. 2167 2168.. option:: -fopenmp-extensions, -fno-openmp-extensions 2169 2170Enable all Clang extensions for OpenMP directives and clauses 2171 2172.. option:: -fopenmp-implicit-rpath, -fno-openmp-implicit-rpath 2173 2174Set rpath on OpenMP executables 2175 2176.. option:: -fopenmp-new-driver 2177 2178Use the new driver for OpenMP offloading. 2179 2180.. option:: -fopenmp-offload-mandatory 2181 2182Do not create a host fallback if offloading to the device fails. 2183 2184.. option:: -fopenmp-simd, -fno-openmp-simd 2185 2186Emit OpenMP code only for SIMD-based constructs. 2187 2188.. option:: -fopenmp-target-debug, -fno-openmp-target-debug 2189 2190Enable debugging in the OpenMP offloading device RTL 2191 2192.. option:: -fopenmp-version=<arg> 2193 2194Set OpenMP version (e.g. 45 for OpenMP 4.5, 50 for OpenMP 5.0). Default value is 50. 2195 2196.. program:: clang1 2197.. option:: -fopenmp=<arg> 2198.. program:: clang 2199 2200.. option:: -foperator-arrow-depth=<arg> 2201 2202.. option:: -foperator-names, -fno-operator-names 2203 2204.. option:: -foptimization-record-file=<file> 2205 2206Specify the output name of the file containing the optimization remarks. Implies -fsave-optimization-record. On Darwin platforms, this cannot be used with multiple -arch <arch> options. 2207 2208.. option:: -foptimization-record-passes=<regex> 2209 2210Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) 2211 2212.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 2213 2214.. option:: -forder-file-instrumentation 2215 2216Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 2217 2218.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 2219 2220.. option:: -fpack-struct, -fno-pack-struct 2221 2222.. program:: clang1 2223.. option:: -fpack-struct=<arg> 2224.. program:: clang 2225 2226Specify the default maximum struct packing alignment 2227 2228.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 2229 2230Recognize and construct Pascal-style string literals 2231 2232.. option:: -fpass-plugin=<dsopath> 2233 2234Load pass plugin from a dynamic shared object file (only with new pass manager). 2235 2236.. option:: -fpatchable-function-entry=<N,M> 2237 2238Generate M NOPs before function entry and N-M NOPs after function entry 2239 2240.. option:: -fpcc-struct-return 2241 2242Override the default ABI to return all structs on the stack 2243 2244.. option:: -fpch-codegen, -fno-pch-codegen 2245 2246Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH 2247 2248.. option:: -fpch-debuginfo, -fno-pch-debuginfo 2249 2250Generate debug info for types in an object file built from this PCH and do not generate them elsewhere 2251 2252.. option:: -fpch-instantiate-templates, -fno-pch-instantiate-templates 2253 2254Instantiate templates already while building a PCH 2255 2256.. option:: -fpch-preprocess 2257 2258.. option:: -fpch-validate-input-files-content 2259 2260Validate PCH input files based on content if mtime differs 2261 2262.. option:: -fpic, -fno-pic 2263 2264.. option:: -fpie, -fno-pie 2265 2266.. option:: -fplt, -fno-plt 2267 2268.. option:: -fplugin=<dsopath> 2269 2270Load the named plugin (dynamic shared object) 2271 2272.. option:: -fprebuilt-implicit-modules, -fno-prebuilt-implicit-modules 2273 2274Look up implicit modules in the prebuilt module path 2275 2276.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 2277 2278.. option:: -fproc-stat-report<arg> 2279 2280Print subprocess statistics 2281 2282.. program:: clang1 2283.. option:: -fproc-stat-report=<arg> 2284.. program:: clang 2285 2286Save subprocess statistics to the given file 2287 2288.. option:: -fprofile-arcs, -fno-profile-arcs 2289 2290.. option:: -fprofile-dir=<arg> 2291 2292.. option:: -fprofile-exclude-files=<arg> 2293 2294Instrument only functions from files where names don't match all the regexes separated by a semi-colon 2295 2296.. option:: -fprofile-filter-files=<arg> 2297 2298Instrument only functions from files where names match any regex separated by a semi-colon 2299 2300.. option:: -fprofile-generate, -fno-profile-generate 2301 2302Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 2303 2304.. program:: clang1 2305.. option:: -fprofile-generate=<directory> 2306.. program:: clang 2307 2308Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 2309 2310.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 2311 2312Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 2313 2314.. program:: clang1 2315.. option:: -fprofile-instr-generate=<file> 2316.. program:: clang 2317 2318Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 2319 2320.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 2321 2322.. program:: clang1 2323.. option:: -fprofile-instr-use=<arg> 2324.. program:: clang 2325 2326Use instrumentation data for profile-guided optimization 2327 2328.. option:: -fprofile-list=<arg> 2329 2330Filename defining the list of functions/files to instrument 2331 2332.. option:: -fprofile-remapping-file=<file> 2333 2334Use the remappings described in <file> to match the profile data against names in the program 2335 2336.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 2337 2338Specifies that the sample profile is accurate. If the sample 2339 profile is accurate, callsites without profile samples are marked 2340 as cold. Otherwise, treat callsites without profile samples as if 2341 we have no profile 2342 2343.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 2344 2345.. program:: clang1 2346.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 2347.. program:: clang 2348 2349Enable sample-based profile guided optimizations 2350 2351.. option:: -fprofile-update=<method> 2352 2353Set update method of profile counters. <method> must be 'atomic', 'prefer-atomic' or 'single'. 2354 2355.. program:: clang1 2356.. option:: -fprofile-use=<pathname> 2357.. program:: clang 2358 2359Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 2360 2361.. option:: -fprotect-parens, -fno-protect-parens 2362 2363Determines whether the optimizer honors parentheses when floating-point expressions are evaluated 2364 2365.. option:: -fpseudo-probe-for-profiling, -fno-pseudo-probe-for-profiling 2366 2367Emit pseudo probes for sample profiling 2368 2369.. option:: -freciprocal-math, -fno-reciprocal-math 2370 2371Allow division operations to be reassociated 2372 2373.. option:: -freg-struct-return 2374 2375Override the default ABI to return small structs in registers 2376 2377.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 2378 2379Use atexit or \_\_cxa\_atexit to register global destructors 2380 2381.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 2382 2383Enable C++17 relaxed template template argument matching 2384 2385.. option:: -freroll-loops, -fno-reroll-loops 2386 2387Turn on loop reroller 2388 2389.. option:: -fretain-comments-from-system-headers 2390 2391.. option:: -frewrite-imports, -fno-rewrite-imports 2392 2393.. option:: -frewrite-includes, -fno-rewrite-includes 2394 2395.. option:: -frewrite-map-file=<arg> 2396 2397.. option:: -fropi, -fno-ropi 2398 2399Generate read-only position independent code (ARM only) 2400 2401.. option:: -frounding-math, -fno-rounding-math 2402 2403.. option:: -frtti, -fno-rtti 2404 2405.. option:: -frtti-data, -fno-rtti-data 2406 2407.. option:: -frwpi, -fno-rwpi 2408 2409Generate read-write position independent code (ARM only) 2410 2411.. option:: -fsanitize-memory-param-retval, -fno-sanitize-memory-param-retval 2412 2413Enable detection of uninitialized parameters and return values 2414 2415.. option:: -fsave-optimization-record, -fno-save-optimization-record 2416 2417Generate a YAML optimization record file 2418 2419.. program:: clang1 2420.. option:: -fsave-optimization-record=<format> 2421.. program:: clang 2422 2423Generate an optimization record file in a specific format 2424 2425.. option:: -fseh-exceptions 2426 2427Use SEH style exceptions 2428 2429.. option:: -fsemantic-interposition, -fno-semantic-interposition 2430 2431.. option:: -fshort-enums, -fno-short-enums 2432 2433Allocate to an enum type only as many bytes as it needs for the declared range of possible values 2434 2435.. option:: -fshort-wchar, -fno-short-wchar 2436 2437Force wchar\_t to be a short unsigned int 2438 2439.. option:: -fshow-column, -fno-show-column 2440 2441.. option:: -fshow-overloads=<arg> 2442 2443Which overload candidates to show when overload resolution fails. Defaults to 'all'. <arg> must be 'best' or 'all'. 2444 2445.. option:: -fshow-source-location, -fno-show-source-location 2446 2447.. option:: -fsignaling-math, -fno-signaling-math 2448 2449.. option:: -fsigned-bitfields 2450 2451.. option:: -fsigned-char, -fno-signed-char, --signed-char 2452 2453char is signed 2454 2455.. option:: -fsigned-zeros, -fno-signed-zeros 2456 2457.. option:: -fsized-deallocation, -fno-sized-deallocation 2458 2459Enable C++14 sized global deallocation functions 2460 2461.. option:: -fsjlj-exceptions 2462 2463Use SjLj style exceptions 2464 2465.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 2466 2467Enable the superword-level parallelism vectorization passes 2468 2469.. option:: -fspell-checking, -fno-spell-checking 2470 2471.. option:: -fspell-checking-limit=<arg> 2472 2473.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 2474 2475Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 2476 2477.. option:: -fsplit-lto-unit, -fno-split-lto-unit 2478 2479Enables splitting of the LTO unit 2480 2481.. option:: -fsplit-machine-functions, -fno-split-machine-functions 2482 2483Enable late function splitting using profile information (x86 ELF) 2484 2485.. option:: -fsplit-stack, -fno-split-stack 2486 2487Use segmented stack 2488 2489.. option:: -fstack-clash-protection, -fno-stack-clash-protection 2490 2491Enable stack clash protection 2492 2493.. option:: -fstack-protector, -fno-stack-protector 2494 2495Enable stack protectors for some functions vulnerable to stack smashing. This uses a loose heuristic which considers functions vulnerable if they contain a char (or 8bit integer) array or constant sized calls to alloca , which are of greater size than ssp-buffer-size (default: 8 bytes). All variable sized calls to alloca are considered vulnerable. A function with a stack protector has a guard value added to the stack frame that is checked on function exit. The guard value must be positioned in the stack frame such that a buffer overflow from a vulnerable variable will overwrite the guard value before overwriting the function's return address. The reference stack guard value is stored in a global variable. 2496 2497.. option:: -fstack-protector-all 2498 2499Enable stack protectors for all functions 2500 2501.. option:: -fstack-protector-strong 2502 2503Enable stack protectors for some functions vulnerable to stack smashing. Compared to -fstack-protector, this uses a stronger heuristic that includes functions containing arrays of any size (and any type), as well as any calls to alloca or the taking of an address from a local variable 2504 2505.. option:: -fstack-size-section, -fno-stack-size-section 2506 2507Emit section containing metadata on function stack sizes 2508 2509.. option:: -fstack-usage 2510 2511Emit .su file containing information on function stack sizes 2512 2513.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 2514 2515Emit full debug info for all types used by the program 2516 2517.. option:: -fstrict-aliasing, -fno-strict-aliasing 2518 2519.. option:: -fstrict-enums, -fno-strict-enums 2520 2521Enable optimizations based on the strict definition of an enum's value range 2522 2523.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 2524 2525Assume that overflowing float-to-int casts are undefined (default) 2526 2527.. option:: -fstrict-overflow, -fno-strict-overflow 2528 2529.. option:: -fstrict-return, -fno-strict-return 2530 2531.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 2532 2533Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 2534 2535.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 2536 2537.. option:: -fswift-async-fp=<option> 2538 2539Control emission of Swift async extended frame info. <option> must be 'auto', 'always' or 'never'. 2540 2541.. option:: -fsymbol-partition=<arg> 2542 2543.. option:: -ftabstop=<arg> 2544 2545.. option:: -ftemplate-backtrace-limit=<arg> 2546 2547.. option:: -ftemplate-depth-<arg> 2548 2549.. option:: -ftemplate-depth=<arg> 2550 2551.. option:: -ftest-coverage, -fno-test-coverage 2552 2553.. option:: -fthin-link-bitcode=<arg> 2554 2555Write minimized bitcode to <file> for the ThinLTO thin link only 2556 2557.. option:: -fthinlto-index=<arg> 2558 2559Perform ThinLTO importing using provided function summary index 2560 2561.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 2562 2563.. option:: -ftime-report 2564 2565.. program:: clang1 2566.. option:: -ftime-report=<arg> 2567.. program:: clang 2568 2569(For new pass manager) 'per-pass': one report for each pass; 'per-pass-run': one report for each pass invocation. <arg> must be 'per-pass' or 'per-pass-run'. 2570 2571.. option:: -ftime-trace 2572 2573 2574Turn on time profiler. Generates JSON file based on output filename. Results 2575can be analyzed with chrome://tracing or `Speedscope App 2576<https://www.speedscope.app>`_ for flamegraph visualization. 2577 2578.. option:: -ftime-trace-granularity=<arg> 2579 2580Minimum time granularity (in microseconds) traced by time profiler 2581 2582.. option:: -ftls-model=<arg> 2583 2584 <arg> must be 'global-dynamic', 'local-dynamic', 'initial-exec' or 'local-exec'. 2585 2586.. option:: -ftrap-function=<arg> 2587 2588Issue call to specified function rather than a trap instruction 2589 2590.. option:: -ftrapping-math, -fno-trapping-math 2591 2592.. option:: -ftrapv 2593 2594Trap on integer overflow 2595 2596.. option:: -ftrapv-handler <arg> 2597 2598.. program:: clang1 2599.. option:: -ftrapv-handler=<function name> 2600.. program:: clang 2601 2602Specify the function to be called on overflow 2603 2604.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 2605 2606Process trigraph sequences 2607 2608.. option:: -ftrivial-auto-var-init-stop-after=<arg> 2609 2610Stop initializing trivial automatic stack variables after the specified number of instances 2611 2612.. option:: -ftrivial-auto-var-init=<arg> 2613 2614Initialize trivial automatic stack variables. Defaults to 'uninitialized'. <arg> must be 'uninitialized', 'zero' or 'pattern'. 2615 2616.. option:: -funique-basic-block-section-names, -fno-unique-basic-block-section-names 2617 2618Use unique names for basic block sections (ELF Only) 2619 2620.. option:: -funique-internal-linkage-names, -fno-unique-internal-linkage-names 2621 2622Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path 2623 2624.. option:: -funique-section-names, -fno-unique-section-names 2625 2626.. option:: -funroll-loops, -fno-unroll-loops 2627 2628Turn on loop unroller 2629 2630.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 2631 2632.. option:: -funsigned-bitfields 2633 2634.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 2635 2636.. option:: -funstable, -fno-unstable 2637 2638Enable unstable and experimental features 2639 2640.. option:: -funwind-tables, -fno-unwind-tables 2641 2642.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 2643 2644.. option:: -fuse-init-array, -fno-use-init-array 2645 2646.. option:: -fuse-ld=<arg> 2647 2648.. option:: -fuse-line-directives, -fno-use-line-directives 2649 2650Use #line in preprocessed output 2651 2652.. option:: -fvalidate-ast-input-files-content 2653 2654Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are considered valid if both contents is identical 2655 2656.. option:: -fveclib=<arg> 2657 2658Use the given vector functions library. <arg> must be 'Accelerate', 'libmvec', 'MASSV', 'SVML', 'Darwin_libsystem_m' or 'none'. 2659 2660.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2661 2662Enable the loop vectorization passes 2663 2664.. option:: -fverbose-asm, -dA, -fno-verbose-asm 2665 2666Generate verbose assembly output 2667 2668.. option:: -fvirtual-function-elimination, -fno-virtual-function-elimination 2669 2670Enables dead virtual function elimination optimization. Requires -flto=full 2671 2672.. option:: -fvisibility-dllexport=<arg> 2673 2674The visibility for dllexport definitions \[-fvisibility-from-dllstorageclass\]. <arg> must be 'default', 'hidden', 'internal' or 'protected'. 2675 2676.. option:: -fvisibility-externs-dllimport=<arg> 2677 2678The visibility for dllimport external declarations \[-fvisibility-from-dllstorageclass\]. <arg> must be 'default', 'hidden', 'internal' or 'protected'. 2679 2680.. option:: -fvisibility-externs-nodllstorageclass=<arg> 2681 2682The visibility for external declarations without an explicit DLL dllstorageclass \[-fvisibility-from-dllstorageclass\]. <arg> must be 'default', 'hidden', 'internal' or 'protected'. 2683 2684.. option:: -fvisibility-from-dllstorageclass, -fno-visibility-from-dllstorageclass 2685 2686Set the visibility of symbols in the generated code from their DLL storage class 2687 2688.. option:: -fvisibility-global-new-delete-hidden 2689 2690Give global C++ operator new and delete declarations hidden visibility 2691 2692.. option:: -fvisibility-inlines-hidden, -fno-visibility-inlines-hidden 2693 2694Give inline C++ member functions hidden visibility by default 2695 2696.. option:: -fvisibility-inlines-hidden-static-local-var, -fno-visibility-inlines-hidden-static-local-var 2697 2698When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default 2699 2700.. option:: -fvisibility-ms-compat 2701 2702Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2703 2704.. option:: -fvisibility-nodllstorageclass=<arg> 2705 2706The visibility for definitions without an explicit DLL export class \[-fvisibility-from-dllstorageclass\]. <arg> must be 'default', 'hidden', 'internal' or 'protected'. 2707 2708.. option:: -fvisibility=<arg> 2709 2710Set the default symbol visibility for all global declarations. <arg> must be 'hidden' or 'default'. 2711 2712.. option:: -fwasm-exceptions 2713 2714Use WebAssembly style exceptions 2715 2716.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2717 2718Enables whole-program vtable optimization. Requires -flto 2719 2720.. option:: -fwrapv, -fno-wrapv 2721 2722Treat signed integer overflow as two's complement 2723 2724.. option:: -fwritable-strings 2725 2726Store string literals as writable data 2727 2728.. option:: -fxl-pragma-pack, -fno-xl-pragma-pack 2729 2730Enable IBM XL #pragma pack handling 2731 2732.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2733 2734Always emit \_\_xray\_customevent(...) calls even if the containing function is not always instrumented 2735 2736.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2737 2738Always emit \_\_xray\_typedevent(...) calls even if the containing function is not always instrumented 2739 2740.. option:: -fxray-always-instrument=<arg> 2741 2742DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2743 2744.. option:: -fxray-attr-list=<arg> 2745 2746Filename defining the list of functions/types for imbuing XRay attributes. 2747 2748.. option:: -fxray-function-groups=<arg> 2749 2750Only instrument 1 of N groups 2751 2752.. option:: -fxray-function-index, -fno-xray-function-index 2753 2754.. option:: -fxray-ignore-loops, -fno-xray-ignore-loops 2755 2756Don't instrument functions with loops unless they also meet the minimum function size 2757 2758.. option:: -fxray-instruction-threshold<arg> 2759 2760.. program:: clang1 2761.. option:: -fxray-instruction-threshold=<arg> 2762.. program:: clang 2763 2764Sets the minimum function size to instrument with XRay 2765 2766.. option:: -fxray-instrument, -fno-xray-instrument 2767 2768Generate XRay instrumentation sleds on function entry and exit 2769 2770.. option:: -fxray-instrumentation-bundle=<arg> 2771 2772Select which XRay instrumentation points to emit. Options: all, none, function-entry, function-exit, function, custom. Default is 'all'. 'function' includes both 'function-entry' and 'function-exit'. 2773 2774.. option:: -fxray-link-deps 2775 2776Tells clang to add the link dependencies for XRay. 2777 2778.. option:: -fxray-modes=<arg> 2779 2780List of modes to link in by default into XRay instrumented binaries. 2781 2782.. option:: -fxray-never-instrument=<arg> 2783 2784DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2785 2786.. option:: -fxray-selected-function-group=<arg> 2787 2788When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1 2789 2790.. option:: -fzero-call-used-regs=<arg> 2791 2792Clear call-used registers upon function return (AArch64/x86 only). <arg> must be 'skip', 'used-gpr-arg', 'used-gpr', 'used-arg', 'used', 'all-gpr-arg', 'all-gpr', 'all-arg' or 'all'. 2793 2794.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2795 2796.. option:: -fzvector, -fno-zvector, -mzvector 2797 2798Enable System z vector language extension 2799 2800.. option:: --gpu-bundle-output, --no-gpu-bundle-output 2801 2802Bundle output files of HIP device compilation 2803 2804.. option:: --offload-new-driver, --no-offload-new-driver 2805 2806Use the new driver for offloading compilation. 2807 2808.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2809 2810Warn on language extensions 2811 2812.. option:: -pedantic-errors, --pedantic-errors 2813 2814OpenCL flags 2815------------ 2816.. option:: -cl-denorms-are-zero 2817 2818OpenCL only. Allow denormals to be flushed to zero. 2819 2820.. option:: -cl-ext=<arg1>,<arg2>... 2821 2822OpenCL only. Enable or disable OpenCL extensions/optional features. The argument is a comma-separated sequence of one or more extension names, each prefixed by '+' or '-'. 2823 2824.. option:: -cl-fast-relaxed-math 2825 2826OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2827 2828.. option:: -cl-finite-math-only 2829 2830OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2831 2832.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2833 2834OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2835 2836.. option:: -cl-kernel-arg-info 2837 2838OpenCL only. Generate kernel argument metadata. 2839 2840.. option:: -cl-mad-enable 2841 2842OpenCL only. Allow use of less precise MAD computations in the generated binary. 2843 2844.. option:: -cl-no-signed-zeros 2845 2846OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2847 2848.. option:: -cl-no-stdinc 2849 2850OpenCL only. Disables all standard includes containing non-native compiler types and functions. 2851 2852.. option:: -cl-opt-disable 2853 2854OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2855 2856.. option:: -cl-single-precision-constant 2857 2858OpenCL only. Treat double precision floating-point constant as single precision constant. 2859 2860.. option:: -cl-std=<arg> 2861 2862OpenCL language standard to compile for. <arg> must be 'cl', 'CL', 'cl1.0', 'CL1.0', 'cl1.1', 'CL1.1', 'cl1.2', 'CL1.2', 'cl2.0', 'CL2.0', 'cl3.0', 'CL3.0', 'clc++', 'CLC++', 'clc++1.0', 'CLC++1.0', 'clc++2021' or 'CLC++2021'. 2863 2864.. option:: -cl-strict-aliasing 2865 2866OpenCL only. This option is added for compatibility with OpenCL 1.0. 2867 2868.. option:: -cl-uniform-work-group-size 2869 2870OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2871 2872.. option:: -cl-unsafe-math-optimizations 2873 2874OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2875 2876SYCL flags 2877---------- 2878.. option:: -fsycl, -fno-sycl 2879 2880Enables SYCL kernels compilation for device 2881 2882.. option:: -sycl-std=<arg> 2883 2884SYCL language standard to compile for. <arg> must be '2020', '2017', '121', '1.2.1' or 'sycl-1.2.1'. 2885 2886Target-dependent compilation options 2887~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2888.. option:: -G<size>, -G=<arg>, -msmall-data-limit=<arg>, -msmall-data-threshold=<arg> 2889 2890Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2891 2892.. option:: -ffixed-x1 2893 2894Reserve the x1 register (AArch64/RISC-V only) 2895 2896.. option:: -ffixed-x10 2897 2898Reserve the x10 register (AArch64/RISC-V only) 2899 2900.. option:: -ffixed-x11 2901 2902Reserve the x11 register (AArch64/RISC-V only) 2903 2904.. option:: -ffixed-x12 2905 2906Reserve the x12 register (AArch64/RISC-V only) 2907 2908.. option:: -ffixed-x13 2909 2910Reserve the x13 register (AArch64/RISC-V only) 2911 2912.. option:: -ffixed-x14 2913 2914Reserve the x14 register (AArch64/RISC-V only) 2915 2916.. option:: -ffixed-x15 2917 2918Reserve the x15 register (AArch64/RISC-V only) 2919 2920.. option:: -ffixed-x16 2921 2922Reserve the x16 register (AArch64/RISC-V only) 2923 2924.. option:: -ffixed-x17 2925 2926Reserve the x17 register (AArch64/RISC-V only) 2927 2928.. option:: -ffixed-x18 2929 2930Reserve the x18 register (AArch64/RISC-V only) 2931 2932.. option:: -ffixed-x19 2933 2934Reserve the x19 register (AArch64/RISC-V only) 2935 2936.. option:: -ffixed-x2 2937 2938Reserve the x2 register (AArch64/RISC-V only) 2939 2940.. option:: -ffixed-x20 2941 2942Reserve the x20 register (AArch64/RISC-V only) 2943 2944.. option:: -ffixed-x21 2945 2946Reserve the x21 register (AArch64/RISC-V only) 2947 2948.. option:: -ffixed-x22 2949 2950Reserve the x22 register (AArch64/RISC-V only) 2951 2952.. option:: -ffixed-x23 2953 2954Reserve the x23 register (AArch64/RISC-V only) 2955 2956.. option:: -ffixed-x24 2957 2958Reserve the x24 register (AArch64/RISC-V only) 2959 2960.. option:: -ffixed-x25 2961 2962Reserve the x25 register (AArch64/RISC-V only) 2963 2964.. option:: -ffixed-x26 2965 2966Reserve the x26 register (AArch64/RISC-V only) 2967 2968.. option:: -ffixed-x27 2969 2970Reserve the x27 register (AArch64/RISC-V only) 2971 2972.. option:: -ffixed-x28 2973 2974Reserve the x28 register (AArch64/RISC-V only) 2975 2976.. option:: -ffixed-x29 2977 2978Reserve the x29 register (AArch64/RISC-V only) 2979 2980.. option:: -ffixed-x3 2981 2982Reserve the x3 register (AArch64/RISC-V only) 2983 2984.. option:: -ffixed-x30 2985 2986Reserve the x30 register (AArch64/RISC-V only) 2987 2988.. option:: -ffixed-x31 2989 2990Reserve the x31 register (AArch64/RISC-V only) 2991 2992.. option:: -ffixed-x4 2993 2994Reserve the x4 register (AArch64/RISC-V only) 2995 2996.. option:: -ffixed-x5 2997 2998Reserve the x5 register (AArch64/RISC-V only) 2999 3000.. option:: -ffixed-x6 3001 3002Reserve the x6 register (AArch64/RISC-V only) 3003 3004.. option:: -ffixed-x7 3005 3006Reserve the x7 register (AArch64/RISC-V only) 3007 3008.. option:: -ffixed-x8 3009 3010Reserve the x8 register (AArch64/RISC-V only) 3011 3012.. option:: -ffixed-x9 3013 3014Reserve the x9 register (AArch64/RISC-V only) 3015 3016.. option:: -ffuchsia-api-level=<arg> 3017 3018Set Fuchsia API level 3019 3020.. option:: -inline-asm=<arg> 3021 3022 <arg> must be 'att' or 'intel'. 3023 3024.. option:: -m16 3025 3026.. option:: -m32 3027 3028.. option:: -m64 3029 3030.. option:: -mabi=<arg> 3031 3032.. program:: clang1 3033.. option:: -mabi=vec-default 3034.. program:: clang 3035 3036Enable the default Altivec ABI on AIX (AIX only). Uses only volatile vector registers. 3037 3038.. program:: clang2 3039.. option:: -mabi=vec-extabi 3040.. program:: clang 3041 3042Enable the extended Altivec ABI on AIX (AIX only). Uses volatile and nonvolatile vector registers 3043 3044.. option:: -maix-struct-return 3045 3046Return all structs in memory (PPC32 only) 3047 3048.. option:: -malign-branch-boundary=<arg> 3049 3050Specify the boundary's size to align branches 3051 3052.. option:: -malign-branch=<arg1>,<arg2>... 3053 3054Specify types of branches to align 3055 3056.. option:: -malign-double 3057 3058Align doubles to two words in structs (x86 only) 3059 3060.. option:: -mamdgpu-ieee, -mno-amdgpu-ieee 3061 3062Sets the IEEE bit in the expected default floating point mode register. Floating point opcodes that support exception flag gathering quiet and propagate signaling NaN inputs per IEEE 754-2008. This option changes the ABI. (AMDGPU only) 3063 3064.. option:: -march=<arg> 3065 3066.. option:: -masm=<arg> 3067 3068.. option:: -mbackchain, -mno-backchain 3069 3070Link stack frames through backchain on System Z 3071 3072.. option:: -mbranch-protection=<arg> 3073 3074Enforce targets of indirect branches and function returns 3075 3076.. option:: -mbranches-within-32B-boundaries 3077 3078Align selected branches (fused, jcc, jmp) within 32-byte boundary 3079 3080.. option:: -mcmodel=<arg>, -mcmodel=medany (equivalent to -mcmodel=medium), -mcmodel=medlow (equivalent to -mcmodel=small) 3081 3082.. option:: -mcode-object-v3, -mno-code-object-v3 3083 3084Legacy option to specify code object ABI V3 (AMDGPU only) 3085 3086.. option:: -mcode-object-version=<arg> 3087 3088Specify code object ABI version. Defaults to 4. (AMDGPU only). <arg> must be 'none', '2', '3', '4' or '5'. 3089 3090.. option:: -mconsole<arg> 3091 3092.. program:: clang1 3093.. option:: -mcpu=<arg>, -mv5 (equivalent to -mcpu=hexagonv5), -mv55 (equivalent to -mcpu=hexagonv55), -mv60 (equivalent to -mcpu=hexagonv60), -mv62 (equivalent to -mcpu=hexagonv62), -mv65 (equivalent to -mcpu=hexagonv65), -mv66 (equivalent to -mcpu=hexagonv66), -mv67 (equivalent to -mcpu=hexagonv67), -mv67t (equivalent to -mcpu=hexagonv67t), -mv68 (equivalent to -mcpu=hexagonv68), -mv69 (equivalent to -mcpu=hexagonv69) 3094.. program:: clang 3095 3096.. option:: -mcrc, -mno-crc 3097 3098Allow use of CRC instructions (ARM/Mips only) 3099 3100.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 3101 3102.. option:: -mdefault-visibility-export-mapping=<arg> 3103 3104Mapping between default visibility and export. <arg> must be 'none', 'explicit' or 'all'. 3105 3106.. option:: -mdll<arg> 3107 3108.. option:: -mdouble=<n 3109 3110Force double to be <n> bits. <n must be '32' or '64'. 3111 3112.. option:: -mdynamic-no-pic<arg> 3113 3114.. option:: -meabi <arg> 3115 3116Set EABI type. Default depends on triple). <arg> must be 'default', '4', '5' or 'gnu'. 3117 3118.. option:: -menable-experimental-extensions 3119 3120Enable use of experimental RISC-V extensions. 3121 3122.. option:: -mfentry 3123 3124Insert calls to fentry at function entry (x86/SystemZ only) 3125 3126.. option:: -mfloat-abi=<arg> 3127 3128 <arg> must be 'soft', 'softfp' or 'hard'. 3129 3130.. option:: -mfpmath=<arg> 3131 3132.. option:: -mfpu=<arg> 3133 3134.. option:: -mgeneral-regs-only 3135 3136Generate code which only uses the general purpose registers (AArch64/x86 only) 3137 3138.. option:: -mglobal-merge, -mno-global-merge 3139 3140Enable merging of globals 3141 3142.. option:: -mhard-float 3143 3144.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 3145 3146.. option:: -mhwmult=<arg> 3147 3148.. option:: -miamcu, -mno-iamcu 3149 3150Use Intel MCU ABI 3151 3152.. option:: -mibt-seal 3153 3154Optimize fcf-protection=branch/full (requires LTO). 3155 3156.. option:: -mignore-xcoff-visibility 3157 3158Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file 3159 3160.. option:: -mimplicit-float, -mno-implicit-float 3161 3162.. option:: -mimplicit-it=<arg> 3163 3164.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 3165 3166(integrated-as) Emit an object file which can be used with an incremental linker 3167 3168.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 3169 3170.. option:: -mkernel 3171 3172.. option:: -mlong-calls, -mno-long-calls 3173 3174Generate branches with extended addressability, usually via indirect jumps. 3175 3176.. option:: -mlvi-cfi, -mno-lvi-cfi 3177 3178Enable only control-flow mitigations for Load Value Injection (LVI) 3179 3180.. option:: -mlvi-hardening, -mno-lvi-hardening 3181 3182Enable all mitigations for Load Value Injection (LVI) 3183 3184.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 3185 3186Set Mac OS X deployment target 3187 3188.. option:: -mmcu=<arg> 3189 3190.. option:: -mms-bitfields, -mno-ms-bitfields 3191 3192Set the default structure layout to be compatible with the Microsoft compiler standard 3193 3194.. option:: -mnop-mcount 3195 3196Generate mcount/\_\_fentry\_\_ calls as nops. To activate they need to be patched in. 3197 3198.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 3199 3200Omit frame pointer setup for leaf functions 3201 3202.. option:: -moslib=<arg> 3203 3204.. option:: -mpacked-stack, -mno-packed-stack 3205 3206Use packed stack layout (SystemZ only). 3207 3208.. option:: -mpad-max-prefix-size=<arg> 3209 3210Specify maximum number of prefixes to use for padding 3211 3212.. option:: -mprefer-vector-width=<arg> 3213 3214Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 3215 3216.. option:: -mqdsp6-compat 3217 3218Enable hexagon-qdsp6 backward compatibility 3219 3220.. option:: -mrecip 3221 3222.. program:: clang1 3223.. option:: -mrecip=<arg1>,<arg2>... 3224.. program:: clang 3225 3226.. option:: -mrecord-mcount 3227 3228Generate a \_\_mcount\_loc section entry for each \_\_fentry\_\_ call. 3229 3230.. option:: -mred-zone, -mno-red-zone 3231 3232.. option:: -mregparm=<arg> 3233 3234.. option:: -mrelax, -mno-relax 3235 3236Enable linker relaxation 3237 3238.. option:: -mrelax-all, -mno-relax-all 3239 3240(integrated-as) Relax all machine instructions 3241 3242.. option:: -mretpoline, -mno-retpoline 3243 3244.. option:: -mrtd, -mno-rtd 3245 3246Make StdCall calling convention the default 3247 3248.. option:: -mseses, -mno-seses 3249 3250Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations 3251 3252.. option:: -msign-return-address=<arg> 3253 3254Select return address signing scope. <arg> must be 'none', 'all' or 'non-leaf'. 3255 3256.. option:: -msim 3257 3258.. option:: -mskip-rax-setup, -mno-skip-rax-setup 3259 3260Skip setting up RAX register when passing variable arguments (x86 only) 3261 3262.. option:: -msoft-float, -mno-soft-float 3263 3264Use software floating point 3265 3266.. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening 3267 3268.. option:: -mstack-alignment=<arg> 3269 3270Set the stack alignment 3271 3272.. option:: -mstack-arg-probe, -mno-stack-arg-probe 3273 3274Enable stack probes 3275 3276.. option:: -mstack-probe-size=<arg> 3277 3278Set the stack probe size 3279 3280.. option:: -mstack-protector-guard-offset=<arg> 3281 3282Use the given offset for addressing the stack-protector guard 3283 3284.. option:: -mstack-protector-guard-reg=<arg> 3285 3286Use the given reg for addressing the stack-protector guard 3287 3288.. option:: -mstack-protector-guard=<arg> 3289 3290Use the given guard (global, tls) for addressing the stack-protector guard 3291 3292.. option:: -mstackrealign, -mno-stackrealign 3293 3294Force realign the stack at entry to every function 3295 3296.. option:: -msvr4-struct-return 3297 3298Return small structs in registers (PPC32 only) 3299 3300.. option:: -mtargetos=<arg> 3301 3302Set the deployment target to be the specified OS and OS version 3303 3304.. option:: -mthread-model <arg> 3305 3306The thread model to use. Defaults to 'posix'). <arg> must be 'posix' or 'single'. 3307 3308.. option:: -mthreads<arg> 3309 3310.. option:: -mthumb, -mno-thumb 3311 3312.. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs 3313 3314Enable direct TLS access through segment registers (default) 3315 3316.. option:: -mtls-size=<arg> 3317 3318Specify bit size of immediate TLS offsets (AArch64 ELF only): 12 (for 4KB) \| 24 (for 16MB, default) \| 32 (for 4GB) \| 48 (for 256TB, needs -mcmodel=large) 3319 3320.. program:: clang1 3321.. option:: -mtune=<arg> 3322.. program:: clang 3323 3324Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC. 3325 3326.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 3327 3328.. option:: -municode<arg> 3329 3330.. option:: -munsafe-fp-atomics, -mno-unsafe-fp-atomics 3331 3332Enable unsafe floating point atomic instructions (AMDGPU only) 3333 3334.. option:: -mvx, -mno-vx 3335 3336.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 3337 3338.. option:: -mwatchos-version-min=<arg> 3339 3340.. option:: -mwavefrontsize64, -mno-wavefrontsize64 3341 3342Specify wavefront size 64 mode (AMDGPU only) 3343 3344.. option:: -mwindows<arg> 3345 3346.. option:: -mx32 3347 3348AARCH64 3349------- 3350.. option:: -fcall-saved-x10 3351 3352Make the x10 register call-saved (AArch64 only) 3353 3354.. option:: -fcall-saved-x11 3355 3356Make the x11 register call-saved (AArch64 only) 3357 3358.. option:: -fcall-saved-x12 3359 3360Make the x12 register call-saved (AArch64 only) 3361 3362.. option:: -fcall-saved-x13 3363 3364Make the x13 register call-saved (AArch64 only) 3365 3366.. option:: -fcall-saved-x14 3367 3368Make the x14 register call-saved (AArch64 only) 3369 3370.. option:: -fcall-saved-x15 3371 3372Make the x15 register call-saved (AArch64 only) 3373 3374.. option:: -fcall-saved-x18 3375 3376Make the x18 register call-saved (AArch64 only) 3377 3378.. option:: -fcall-saved-x8 3379 3380Make the x8 register call-saved (AArch64 only) 3381 3382.. option:: -fcall-saved-x9 3383 3384Make the x9 register call-saved (AArch64 only) 3385 3386.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 3387 3388Workaround Cortex-A53 erratum 835769 (AArch64 only) 3389 3390.. option:: -mmark-bti-property 3391 3392Add .note.gnu.property with BTI to assembly files (AArch64 only) 3393 3394.. option:: -msve-vector-bits=<arg> 3395 3396Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only) 3397 3398.. option:: -mvscale-max=<arg> 3399 3400Specify the vscale maximum. Defaults to the vector length agnostic value of "0". (AArch64 only) 3401 3402.. option:: -mvscale-min=<arg> 3403 3404Specify the vscale minimum. Defaults to "1". (AArch64 only) 3405 3406AMDGPU 3407------ 3408.. option:: -mcumode, -mno-cumode 3409 3410Specify CU wavefront execution mode (AMDGPU only) 3411 3412.. option:: -mtgsplit, -mno-tgsplit 3413 3414Enable threadgroup split execution mode (AMDGPU only) 3415 3416ARM 3417--- 3418.. option:: -faapcs-bitfield-load 3419 3420Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only). 3421 3422.. option:: -faapcs-bitfield-width, -fno-aapcs-bitfield-width 3423 3424Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only). 3425 3426.. option:: -ffixed-r9 3427 3428Reserve the r9 register (ARM only) 3429 3430.. option:: -mcmse 3431 3432Allow use of CMSE (Armv8-M Security Extensions) 3433 3434.. option:: -mexecute-only, -mno-execute-only, -mpure-code 3435 3436Disallow generation of data access to code sections (ARM only) 3437 3438.. option:: -mfix-cmse-cve-2021-35465, -mno-fix-cmse-cve-2021-35465 3439 3440Work around VLLDM erratum CVE-2021-35465 (ARM only) 3441 3442.. option:: -mfix-cortex-a57-aes-1742098, -mfix-cortex-a72-aes-1655431, -mno-fix-cortex-a57-aes-1742098 3443 3444Work around Cortex-A57 Erratum 1742098 (ARM only) 3445 3446.. option:: -mframe-chain=<arg> 3447 3448Select the frame chain model used to emit frame records (Arm only). <arg> must be 'none', 'aapcs' or 'aapcs+leaf'. 3449 3450.. option:: -mno-bti-at-return-twice 3451 3452Do not add a BTI instruction after a setjmp or other return-twice construct (Arm/AArch64 only) 3453 3454.. option:: -mno-movt 3455 3456Disallow use of movt/movw pairs (ARM only) 3457 3458.. option:: -mno-neg-immediates 3459 3460Disallow converting instructions with negative immediates to their negation or inversion. 3461 3462.. option:: -mnocrc 3463 3464Disallow use of CRC instructions (ARM only) 3465 3466.. option:: -mrestrict-it, -mno-restrict-it 3467 3468Disallow generation of complex IT blocks. 3469 3470.. option:: -mtp=<arg> 3471 3472Thread pointer access method (AArch32/AArch64 only). <arg> must be 'soft', 'cp15', 'el0', 'el1', 'el2' or 'el3'. 3473 3474.. option:: -munaligned-access, -mno-unaligned-access 3475 3476Allow memory accesses to be unaligned (AArch32/AArch64 only) 3477 3478Hexagon 3479------- 3480.. option:: -mhvx-ieee-fp, -mno-hvx-ieee-fp 3481 3482Enable Hexagon HVX IEEE floating-point 3483 3484.. option:: -mieee-rnd-near 3485 3486.. option:: -mmemops, -mno-memops 3487 3488Enable generation of memop instructions 3489 3490.. option:: -mnvj, -mno-nvj 3491 3492Enable generation of new-value jumps 3493 3494.. option:: -mnvs, -mno-nvs 3495 3496Enable generation of new-value stores 3497 3498.. option:: -mpackets, -mno-packets 3499 3500Enable generation of instruction packets 3501 3502Hexagon 3503------- 3504.. option:: -mhvx, -mno-hvx 3505 3506Enable Hexagon Vector eXtensions 3507 3508.. option:: -mhvx-length=<arg> 3509 3510Set Hexagon Vector Length. <arg> must be '64B' or '128B'. 3511 3512.. option:: -mhvx-qfloat, -mno-hvx-qfloat 3513 3514Enable Hexagon HVX QFloat instructions 3515 3516.. program:: clang1 3517.. option:: -mhvx=<arg> 3518.. program:: clang 3519 3520Enable Hexagon Vector eXtensions 3521 3522M68k 3523---- 3524.. option:: -ffixed-a0 3525 3526Reserve the a0 register (M68k only) 3527 3528.. option:: -ffixed-a1 3529 3530Reserve the a1 register (M68k only) 3531 3532.. option:: -ffixed-a2 3533 3534Reserve the a2 register (M68k only) 3535 3536.. option:: -ffixed-a3 3537 3538Reserve the a3 register (M68k only) 3539 3540.. option:: -ffixed-a4 3541 3542Reserve the a4 register (M68k only) 3543 3544.. option:: -ffixed-a5 3545 3546Reserve the a5 register (M68k only) 3547 3548.. option:: -ffixed-a6 3549 3550Reserve the a6 register (M68k only) 3551 3552.. option:: -ffixed-d0 3553 3554Reserve the d0 register (M68k only) 3555 3556.. option:: -ffixed-d1 3557 3558Reserve the d1 register (M68k only) 3559 3560.. option:: -ffixed-d2 3561 3562Reserve the d2 register (M68k only) 3563 3564.. option:: -ffixed-d3 3565 3566Reserve the d3 register (M68k only) 3567 3568.. option:: -ffixed-d4 3569 3570Reserve the d4 register (M68k only) 3571 3572.. option:: -ffixed-d5 3573 3574Reserve the d5 register (M68k only) 3575 3576.. option:: -ffixed-d6 3577 3578Reserve the d6 register (M68k only) 3579 3580.. option:: -ffixed-d7 3581 3582Reserve the d7 register (M68k only) 3583 3584.. option:: -m68000 3585 3586.. option:: -m68010 3587 3588.. option:: -m68020 3589 3590.. option:: -m68030 3591 3592.. option:: -m68040 3593 3594.. option:: -m68060 3595 3596MIPS 3597---- 3598.. option:: -mabicalls, -mno-abicalls 3599 3600Enable SVR4-style position-independent code (Mips only) 3601 3602.. option:: -mabs=<arg> 3603 3604.. option:: -mcheck-zero-division, -mno-check-zero-division 3605 3606.. option:: -mcompact-branches=<arg> 3607 3608.. option:: -mdouble-float 3609 3610.. option:: -mdsp, -mno-dsp 3611 3612.. option:: -mdspr2, -mno-dspr2 3613 3614.. option:: -membedded-data, -mno-embedded-data 3615 3616Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 3617 3618.. option:: -mextern-sdata, -mno-extern-sdata 3619 3620Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 3621 3622.. option:: -mfix4300 3623 3624.. option:: -mfp32 3625 3626Use 32-bit floating point registers (MIPS only) 3627 3628.. option:: -mfp64 3629 3630Use 64-bit floating point registers (MIPS only) 3631 3632.. option:: -mginv, -mno-ginv 3633 3634.. option:: -mgpopt, -mno-gpopt 3635 3636Use GP relative accesses for symbols known to be in a small data section (MIPS) 3637 3638.. option:: -mindirect-jump=<arg> 3639 3640Change indirect jump instructions to inhibit speculation 3641 3642.. option:: -mips16 3643 3644.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 3645 3646.. option:: -mlocal-sdata, -mno-local-sdata 3647 3648Extend the -G behaviour to object local data (MIPS) 3649 3650.. option:: -mmadd4, -mno-madd4 3651 3652Enable the generation of 4-operand madd.s, madd.d and related instructions. 3653 3654.. option:: -mmicromips, -mno-micromips 3655 3656.. option:: -mmsa, -mno-msa 3657 3658Enable MSA ASE (MIPS only) 3659 3660.. option:: -mmt, -mno-mt 3661 3662Enable MT ASE (MIPS only) 3663 3664.. option:: -mnan=<arg> 3665 3666.. option:: -mno-mips16 3667 3668.. option:: -msingle-float 3669 3670.. option:: -mvirt, -mno-virt 3671 3672.. option:: -mxgot, -mno-xgot 3673 3674PowerPC 3675------- 3676.. option:: -maltivec, -mno-altivec 3677 3678.. option:: -mcmpb, -mno-cmpb 3679 3680.. option:: -mcrbits, -mno-crbits 3681 3682.. option:: -mcrypto, -mno-crypto 3683 3684.. option:: -mdirect-move, -mno-direct-move 3685 3686.. option:: -mefpu2 3687 3688.. option:: -mfloat128, -mno-float128 3689 3690.. option:: -mfprnd, -mno-fprnd 3691 3692.. option:: -mhtm, -mno-htm 3693 3694.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 3695 3696.. option:: -misel, -mno-isel 3697 3698.. option:: -mlongcall, -mno-longcall 3699 3700.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 3701 3702.. option:: -mmma, -mno-mma 3703 3704.. option:: -mpaired-vector-memops, -mno-paired-vector-memops 3705 3706.. option:: -mpcrel, -mno-pcrel 3707 3708.. option:: -mpopcntd, -mno-popcntd 3709 3710.. option:: -mpower10-vector, -mno-power10-vector 3711 3712.. option:: -mpower8-vector, -mno-power8-vector 3713 3714.. option:: -mpower9-vector, -mno-power9-vector 3715 3716.. option:: -mprefixed, -mno-prefixed 3717 3718.. option:: -mprivileged 3719 3720.. option:: -mrop-protect 3721 3722.. option:: -msecure-plt 3723 3724.. option:: -mspe, -mno-spe 3725 3726.. option:: -mvsx, -mno-vsx 3727 3728WebAssembly 3729----------- 3730.. option:: -matomics, -mno-atomics 3731 3732.. option:: -mbulk-memory, -mno-bulk-memory 3733 3734.. option:: -mexception-handling, -mno-exception-handling 3735 3736.. option:: -mextended-const, -mno-extended-const 3737 3738.. option:: -mmultivalue, -mno-multivalue 3739 3740.. option:: -mmutable-globals, -mno-mutable-globals 3741 3742.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 3743 3744.. option:: -mreference-types, -mno-reference-types 3745 3746.. option:: -mrelaxed-simd, -mno-relaxed-simd 3747 3748.. option:: -msign-ext, -mno-sign-ext 3749 3750.. option:: -msimd128, -mno-simd128 3751 3752.. option:: -mtail-call, -mno-tail-call 3753 3754WebAssembly Driver 3755------------------ 3756.. option:: -mexec-model=<arg> 3757 3758Execution model (WebAssembly only). <arg> must be 'command' or 'reactor'. 3759 3760X86 3761--- 3762.. option:: -m3dnow, -mno-3dnow 3763 3764.. option:: -m3dnowa, -mno-3dnowa 3765 3766.. option:: -madx, -mno-adx 3767 3768.. option:: -maes, -mno-aes 3769 3770.. option:: -mamx-bf16, -mno-amx-bf16 3771 3772.. option:: -mamx-int8, -mno-amx-int8 3773 3774.. option:: -mamx-tile, -mno-amx-tile 3775 3776.. option:: -mavx, -mno-avx 3777 3778.. option:: -mavx2, -mno-avx2 3779 3780.. option:: -mavx512bf16, -mno-avx512bf16 3781 3782.. option:: -mavx512bitalg, -mno-avx512bitalg 3783 3784.. option:: -mavx512bw, -mno-avx512bw 3785 3786.. option:: -mavx512cd, -mno-avx512cd 3787 3788.. option:: -mavx512dq, -mno-avx512dq 3789 3790.. option:: -mavx512er, -mno-avx512er 3791 3792.. option:: -mavx512f, -mno-avx512f 3793 3794.. option:: -mavx512fp16, -mno-avx512fp16 3795 3796.. option:: -mavx512ifma, -mno-avx512ifma 3797 3798.. option:: -mavx512pf, -mno-avx512pf 3799 3800.. option:: -mavx512vbmi, -mno-avx512vbmi 3801 3802.. option:: -mavx512vbmi2, -mno-avx512vbmi2 3803 3804.. option:: -mavx512vl, -mno-avx512vl 3805 3806.. option:: -mavx512vnni, -mno-avx512vnni 3807 3808.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 3809 3810.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 3811 3812.. option:: -mavxvnni, -mno-avxvnni 3813 3814.. option:: -mbmi, -mno-bmi 3815 3816.. option:: -mbmi2, -mno-bmi2 3817 3818.. option:: -mcldemote, -mno-cldemote 3819 3820.. option:: -mclflushopt, -mno-clflushopt 3821 3822.. option:: -mclwb, -mno-clwb 3823 3824.. option:: -mclzero, -mno-clzero 3825 3826.. option:: -mcrc32, -mno-crc32 3827 3828.. option:: -mcx16, -mno-cx16 3829 3830.. option:: -menqcmd, -mno-enqcmd 3831 3832.. option:: -mf16c, -mno-f16c 3833 3834.. option:: -mfma, -mno-fma 3835 3836.. option:: -mfma4, -mno-fma4 3837 3838.. option:: -mfsgsbase, -mno-fsgsbase 3839 3840.. option:: -mfxsr, -mno-fxsr 3841 3842.. option:: -mgfni, -mno-gfni 3843 3844.. option:: -mhreset, -mno-hreset 3845 3846.. option:: -minvpcid, -mno-invpcid 3847 3848.. option:: -mkl, -mno-kl 3849 3850.. option:: -mlwp, -mno-lwp 3851 3852.. option:: -mlzcnt, -mno-lzcnt 3853 3854.. option:: -mmmx, -mno-mmx 3855 3856.. option:: -mmovbe, -mno-movbe 3857 3858.. option:: -mmovdir64b, -mno-movdir64b 3859 3860.. option:: -mmovdiri, -mno-movdiri 3861 3862.. option:: -mmwaitx, -mno-mwaitx 3863 3864.. option:: -mpclmul, -mno-pclmul 3865 3866.. option:: -mpconfig, -mno-pconfig 3867 3868.. option:: -mpku, -mno-pku 3869 3870.. option:: -mpopcnt, -mno-popcnt 3871 3872.. option:: -mprefetchwt1, -mno-prefetchwt1 3873 3874.. option:: -mprfchw, -mno-prfchw 3875 3876.. option:: -mptwrite, -mno-ptwrite 3877 3878.. option:: -mrdpid, -mno-rdpid 3879 3880.. option:: -mrdpru, -mno-rdpru 3881 3882.. option:: -mrdrnd, -mno-rdrnd 3883 3884.. option:: -mrdseed, -mno-rdseed 3885 3886.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 3887 3888.. option:: -mrtm, -mno-rtm 3889 3890.. option:: -msahf, -mno-sahf 3891 3892.. option:: -mserialize, -mno-serialize 3893 3894.. option:: -msgx, -mno-sgx 3895 3896.. option:: -msha, -mno-sha 3897 3898.. option:: -mshstk, -mno-shstk 3899 3900.. option:: -msse, -mno-sse 3901 3902.. option:: -msse2, -mno-sse2 3903 3904.. option:: -msse3, -mno-sse3 3905 3906.. option:: -msse4.1, -mno-sse4.1 3907 3908.. program:: clang1 3909.. option:: -msse4.2, -mno-sse4.2, -msse4 3910.. program:: clang 3911 3912.. option:: -msse4a, -mno-sse4a 3913 3914.. option:: -mssse3, -mno-ssse3 3915 3916.. option:: -mtbm, -mno-tbm 3917 3918.. option:: -mtsxldtrk, -mno-tsxldtrk 3919 3920.. option:: -muintr, -mno-uintr 3921 3922.. option:: -mvaes, -mno-vaes 3923 3924.. option:: -mvpclmulqdq, -mno-vpclmulqdq 3925 3926.. option:: -mvzeroupper, -mno-vzeroupper 3927 3928.. option:: -mwaitpkg, -mno-waitpkg 3929 3930.. option:: -mwbnoinvd, -mno-wbnoinvd 3931 3932.. option:: -mwidekl, -mno-widekl 3933 3934.. option:: -mx87, -m80387, -mno-x87 3935 3936.. option:: -mxop, -mno-xop 3937 3938.. option:: -mxsave, -mno-xsave 3939 3940.. option:: -mxsavec, -mno-xsavec 3941 3942.. option:: -mxsaveopt, -mno-xsaveopt 3943 3944.. option:: -mxsaves, -mno-xsaves 3945 3946RISCV 3947----- 3948.. option:: -msave-restore, -mno-save-restore 3949 3950Enable using library calls for save and restore 3951 3952Long double flags 3953----------------- 3954Selects the long double implementation 3955 3956.. option:: -mlong-double-128 3957 3958Force long double to be 128 bits 3959 3960.. option:: -mlong-double-64 3961 3962Force long double to be 64 bits 3963 3964.. option:: -mlong-double-80 3965 3966Force long double to be 80 bits, padded to 128 bits for storage 3967 3968Optimization level 3969~~~~~~~~~~~~~~~~~~ 3970 3971Flags controlling how much optimization should be performed. 3972 3973.. option:: -O<arg>, -O (equivalent to -O1), --optimize, --optimize=<arg> 3974 3975.. option:: -Ofast<arg> 3976 3977Debug information generation 3978~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3979 3980Flags controlling how much and what kind of debug information should be 3981generated. 3982 3983Kind and level of debug information 3984----------------------------------- 3985.. option:: -g, --debug, --debug=<arg> 3986 3987Generate source-level debug information 3988 3989.. option:: -gdwarf 3990 3991Generate source-level debug information with the default dwarf version 3992 3993.. option:: -gdwarf-2 3994 3995Generate source-level debug information with dwarf version 2 3996 3997.. option:: -gdwarf-3 3998 3999Generate source-level debug information with dwarf version 3 4000 4001.. option:: -gdwarf-4 4002 4003Generate source-level debug information with dwarf version 4 4004 4005.. option:: -gdwarf-5 4006 4007Generate source-level debug information with dwarf version 5 4008 4009.. option:: -gdwarf32 4010 4011Enables DWARF32 format for ELF binaries, if debug information emission is enabled. 4012 4013.. option:: -gdwarf64 4014 4015Enables DWARF64 format for ELF binaries, if debug information emission is enabled. 4016 4017.. option:: -gfull 4018 4019.. option:: -ginline-line-tables, -gno-inline-line-tables 4020 4021.. option:: -gused 4022 4023Debug level 4024___________ 4025.. option:: -g0 4026 4027.. option:: -g2 4028 4029.. option:: -g3 4030 4031.. option:: -ggdb0 4032 4033.. option:: -ggdb1 4034 4035.. option:: -ggdb2 4036 4037.. option:: -ggdb3 4038 4039.. option:: -gline-directives-only 4040 4041Emit debug line info directives only 4042 4043.. option:: -gline-tables-only, -g1, -gmlt 4044 4045Emit debug line number tables only 4046 4047.. option:: -gmodules 4048 4049Generate debug info with external references to clang modules or precompiled headers 4050 4051Debugger to tune debug information for 4052______________________________________ 4053.. option:: -gdbx 4054 4055.. option:: -ggdb 4056 4057.. option:: -glldb 4058 4059.. option:: -gsce 4060 4061Debug information flags 4062----------------------- 4063.. option:: -gcolumn-info, -gno-column-info 4064 4065.. option:: -gdwarf-aranges 4066 4067.. option:: -gembed-source, -gno-embed-source 4068 4069Embed source text in DWARF debug sections 4070 4071.. option:: -ggnu-pubnames, -gno-gnu-pubnames 4072 4073.. option:: -gpubnames, -gno-pubnames 4074 4075.. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches 4076 4077.. option:: -gsimple-template-names, -gno-simple-template-names 4078 4079.. option:: -gsplit-dwarf, -gno-split-dwarf 4080 4081.. program:: clang1 4082.. option:: -gsplit-dwarf=<arg> 4083.. program:: clang 4084 4085Set DWARF fission mode. <arg> must be 'split' or 'single'. 4086 4087.. option:: -gstrict-dwarf, -gno-strict-dwarf 4088 4089.. option:: -gz=<arg>, -gz (equivalent to -gz=zlib) 4090 4091DWARF debug sections compression type 4092 4093Static analyzer flags 4094===================== 4095 4096Flags controlling the behavior of the Clang Static Analyzer. 4097 4098.. option:: -Xanalyzer <arg> 4099 4100Pass <arg> to the static analyzer 4101 4102Fortran compilation flags 4103========================= 4104 4105Flags that will be passed onto the ``gfortran`` compiler when Clang is given 4106a Fortran input. 4107 4108.. option:: -A<arg>, --assert <arg>, --assert=<arg> 4109 4110.. option:: -A-<arg> 4111 4112.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 4113 4114.. option:: -falign-commons, -fno-align-commons 4115 4116.. option:: -fall-intrinsics, -fno-all-intrinsics 4117 4118.. option:: -fbacktrace, -fno-backtrace 4119 4120.. option:: -fblas-matmul-limit=<arg> 4121 4122.. option:: -fbounds-check, -fno-bounds-check 4123 4124.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 4125 4126.. option:: -fcheck=<arg> 4127 4128.. option:: -fcoarray=<arg> 4129 4130.. option:: -fconvert=<arg> 4131 4132.. option:: -fcray-pointer, -fno-cray-pointer 4133 4134.. option:: -fd-lines-as-code, -fno-d-lines-as-code 4135 4136.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 4137 4138.. option:: -fdollar-ok, -fno-dollar-ok 4139 4140.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 4141 4142.. option:: -fdump-fortran-original, -fno-dump-fortran-original 4143 4144.. option:: -fdump-parse-tree, -fno-dump-parse-tree 4145 4146.. option:: -fexternal-blas, -fno-external-blas 4147 4148.. option:: -ff2c, -fno-f2c 4149 4150.. option:: -ffpe-trap=<arg> 4151 4152.. option:: -ffree-line-length-<arg> 4153 4154.. option:: -ffrontend-optimize, -fno-frontend-optimize 4155 4156.. option:: -finit-character=<arg> 4157 4158.. option:: -finit-integer=<arg> 4159 4160.. option:: -finit-local-zero, -fno-init-local-zero 4161 4162.. option:: -finit-logical=<arg> 4163 4164.. option:: -finit-real=<arg> 4165 4166.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 4167 4168.. option:: -fmax-array-constructor=<arg> 4169 4170.. option:: -fmax-errors=<arg> 4171 4172.. option:: -fmax-identifier-length, -fno-max-identifier-length 4173 4174.. option:: -fmax-stack-var-size=<arg> 4175 4176.. option:: -fmax-subrecord-length=<arg> 4177 4178.. option:: -fmodule-private, -fno-module-private 4179 4180.. option:: -fpack-derived, -fno-pack-derived 4181 4182.. option:: -frange-check, -fno-range-check 4183 4184.. option:: -freal-4-real-10, -fno-real-4-real-10 4185 4186.. option:: -freal-4-real-16, -fno-real-4-real-16 4187 4188.. option:: -freal-4-real-8, -fno-real-4-real-8 4189 4190.. option:: -freal-8-real-10, -fno-real-8-real-10 4191 4192.. option:: -freal-8-real-16, -fno-real-8-real-16 4193 4194.. option:: -freal-8-real-4, -fno-real-8-real-4 4195 4196.. option:: -frealloc-lhs, -fno-realloc-lhs 4197 4198.. option:: -frecord-marker=<arg> 4199 4200.. option:: -frecursive, -fno-recursive 4201 4202.. option:: -frepack-arrays, -fno-repack-arrays 4203 4204.. option:: -fsecond-underscore, -fno-second-underscore 4205 4206.. option:: -fsign-zero, -fno-sign-zero 4207 4208.. option:: -fstack-arrays, -fno-stack-arrays 4209 4210.. option:: -funderscoring, -fno-underscoring 4211 4212.. option:: -fwhole-file, -fno-whole-file 4213 4214.. option:: -imultilib <arg> 4215 4216.. option:: -static-libgfortran 4217 4218Linker flags 4219============ 4220Flags that are passed on to the linker 4221 4222.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 4223 4224Add directory to library search path 4225 4226.. option:: -Mach 4227 4228.. option:: -T<script> 4229 4230Specify <script> as linker script 4231 4232.. option:: -Tbss<addr> 4233 4234Set starting address of BSS to <addr> 4235 4236.. option:: -Tdata<addr> 4237 4238Set starting address of DATA to <addr> 4239 4240.. option:: -Ttext<addr> 4241 4242Set starting address of TEXT to <addr> 4243 4244.. option:: -Wl,<arg>,<arg2>... 4245 4246Pass the comma separated arguments in <arg> to the linker 4247 4248.. option:: -X 4249 4250.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 4251 4252Pass <arg> to the linker 4253 4254.. option:: -Xoffload-linker<triple> <arg> 4255 4256Pass <arg> to the offload linkers or the ones idenfied by -<triple> 4257 4258.. program:: clang1 4259.. option:: -Z 4260.. program:: clang 4261 4262.. option:: -b<arg> 4263 4264Pass -b <arg> to the linker on AIX (only). 4265 4266.. option:: -coverage, --coverage 4267 4268.. option:: -e<arg>, --entry 4269 4270.. option:: -filelist <arg> 4271 4272.. option:: --hip-device-lib=<arg> 4273 4274HIP device library 4275 4276.. option:: --hipspv-pass-plugin=<dsopath> 4277 4278path to a pass plugin for HIP to SPIR-V passes. 4279 4280.. option:: -l<arg> 4281 4282.. option:: --ld-path=<arg> 4283 4284.. option:: -nostartfiles 4285 4286.. program:: clang1 4287.. option:: -nostdlib, --no-standard-libraries 4288.. program:: clang 4289 4290.. option:: --offload-link 4291 4292Use the new offloading linker to perform the link job. 4293 4294.. option:: -pie 4295 4296.. option:: -r 4297 4298.. option:: -rdynamic 4299 4300.. option:: --rocm-device-lib-path=<arg>, --hip-device-lib-path=<arg> 4301 4302ROCm device library path. Alternative to rocm-path. 4303 4304.. option:: -rpath <arg> 4305 4306.. option:: -s 4307 4308.. option:: -shared, --shared 4309 4310.. option:: -specs=<arg>, --specs=<arg> 4311 4312.. option:: -static, --static 4313 4314.. option:: -static-pie 4315 4316.. option:: -t 4317 4318.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 4319 4320.. option:: -undef 4321 4322undef all system defines 4323 4324.. option:: -undefined<arg>, --no-undefined 4325 4326.. option:: -z <arg> 4327 4328Pass -z <arg> to the linker 4329 4330<clang-dxc options> 4331=================== 4332dxc compatibility options 4333 4334.. program:: clang3 4335.. option:: /T<profile>, -T<profile> 4336.. program:: clang 4337 4338Set target profile. <profile> must be 'ps_6_0', ' ps_6_1', ' ps_6_2', ' ps_6_3', ' ps_6_4', ' ps_6_5', ' ps_6_6', ' ps_6_7', 'vs_6_0', ' vs_6_1', ' vs_6_2', ' vs_6_3', ' vs_6_4', ' vs_6_5', ' vs_6_6', ' vs_6_7', 'gs_6_0', ' gs_6_1', ' gs_6_2', ' gs_6_3', ' gs_6_4', ' gs_6_5', ' gs_6_6', ' gs_6_7', 'hs_6_0', ' hs_6_1', ' hs_6_2', ' hs_6_3', ' hs_6_4', ' hs_6_5', ' hs_6_6', ' hs_6_7', 'ds_6_0', ' ds_6_1', ' ds_6_2', ' ds_6_3', ' ds_6_4', ' ds_6_5', ' ds_6_6', ' ds_6_7', 'cs_6_0', ' cs_6_1', ' cs_6_2', ' cs_6_3', ' cs_6_4', ' cs_6_5', ' cs_6_6', ' cs_6_7', 'lib_6_3', ' lib_6_4', ' lib_6_5', ' lib_6_6', ' lib_6_7', ' lib_6_x', 'ms_6_5', ' ms_6_6', ' ms_6_7', 'as_6_5', ' as_6_6' or ' as_6_7'. 4339 4340.. program:: clang4 4341.. option:: /emit-pristine-llvm, -emit-pristine-llvm, /fcgl, -fcgl 4342.. program:: clang 4343 4344Emit pristine LLVM IR from the frontend by not running any LLVM passes at all.Same as -S + -emit-llvm + -disable-llvm-passes. 4345 4346.. program:: clang5 4347.. option:: /hlsl-no-stdinc, -hlsl-no-stdinc 4348.. program:: clang 4349 4350HLSL only. Disables all standard includes containing non-native compiler types and functions. 4351 4352