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-new-launch-api, -fno-hip-new-launch-api 1877 1878Use new kernel launching API for HIP 1879 1880.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1881 1882.. option:: -fhonor-nans, -fno-honor-nans 1883 1884.. option:: -fhosted 1885 1886.. option:: -fignore-exceptions 1887 1888Enable support for ignoring exception handling constructs 1889 1890.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1891 1892Implicitly search the file system for module map files. 1893 1894.. option:: -fimplicit-modules, -fno-implicit-modules 1895 1896.. option:: -finput-charset=<arg> 1897 1898Specify the default character set for source files 1899 1900.. option:: -finstrument-function-entry-bare 1901 1902Instrument function entry only, after inlining, without arguments to the instrumentation call 1903 1904.. option:: -finstrument-functions 1905 1906Generate calls to instrument function entry and exit 1907 1908.. option:: -finstrument-functions-after-inlining 1909 1910Like -finstrument-functions, but insert the calls after inlining 1911 1912.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1913 1914Enable the integrated assembler 1915 1916.. option:: -fintegrated-cc1, -fno-integrated-cc1 1917 1918Run cc1 in-process 1919 1920.. option:: -fintegrated-objemitter, -fno-integrated-objemitter 1921 1922Use internal machine object code emitter. 1923 1924.. option:: -fjmc, -fno-jmc 1925 1926Enable just-my-code debugging 1927 1928.. option:: -fjump-tables, -fno-jump-tables 1929 1930Use jump tables for lowering switches 1931 1932.. option:: -fkeep-static-consts, -fno-keep-static-consts 1933 1934Keep static const variables if unused 1935 1936.. option:: -flax-vector-conversions=<arg>, -flax-vector-conversions (equivalent to -flax-vector-conversions=integer), -fno-lax-vector-conversions (equivalent to -flax-vector-conversions=none) 1937 1938Enable implicit vector bit-casts. <arg> must be 'none', 'integer' or 'all'. 1939 1940.. option:: -flimited-precision=<arg> 1941 1942.. option:: -flto-jobs=<arg> 1943 1944Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1945 1946.. option:: -flto=<arg>, -flto (equivalent to -flto=full), -flto=auto (equivalent to -flto=full), -flto=jobserver (equivalent to -flto=full) 1947 1948Set LTO mode. <arg> must be 'thin' or 'full'. 1949 1950.. option:: -fmacro-backtrace-limit=<arg> 1951 1952.. option:: -fmacro-prefix-map=<arg> 1953 1954remap file source paths in predefined preprocessor macros and \_\_builtin\_FILE(). Implies -ffile-reproducible. 1955 1956.. option:: -fmath-errno, -fno-math-errno 1957 1958Require math functions to indicate errors by setting errno 1959 1960.. option:: -fmax-tokens=<arg> 1961 1962Max total number of preprocessed tokens for -Wmax-tokens. 1963 1964.. option:: -fmax-type-align=<arg> 1965 1966Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1967 1968.. option:: -fmemory-profile, -fno-memory-profile 1969 1970Enable heap memory profiling 1971 1972.. program:: clang1 1973.. option:: -fmemory-profile=<directory> 1974.. program:: clang 1975 1976Enable heap memory profiling and dump results into <directory> 1977 1978.. option:: -fmerge-all-constants, -fno-merge-all-constants 1979 1980Allow merging of constants 1981 1982.. option:: -fmessage-length=<arg> 1983 1984Format message diagnostics so that they fit within N columns 1985 1986.. option:: -fminimize-whitespace, -fno-minimize-whitespace 1987 1988Minimize whitespace when emitting preprocessor output 1989 1990.. option:: -fmodule-file-deps, -fno-module-file-deps 1991 1992.. option:: -fmodule-header 1993 1994Build a C++20 Header Unit from a header. 1995 1996.. program:: clang1 1997.. option:: -fmodule-header=<kind> 1998.. program:: clang 1999 2000Build 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. 2001 2002.. option:: -fmodule-map-file=<file> 2003 2004Load this module map file 2005 2006.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg> 2007 2008Specify the name of the module to build 2009 2010.. option:: -fmodules, -fno-modules 2011 2012Enable the 'modules' language feature 2013 2014.. option:: -fmodules-decluse, -fno-modules-decluse 2015 2016Require declaration of modules used within a module 2017 2018.. option:: -fmodules-ignore-macro=<arg> 2019 2020Ignore the definition of the given macro when building and loading modules 2021 2022.. option:: -fmodules-search-all, -fno-modules-search-all 2023 2024Search even non-imported modules to resolve references 2025 2026.. option:: -fmodules-strict-decluse 2027 2028Like -fmodules-decluse but requires all headers to be in modules 2029 2030.. option:: -fmodules-ts 2031 2032Enable support for the C++ Modules TS 2033 2034.. option:: -fmodules-validate-input-files-content 2035 2036Validate PCM input files based on content if mtime differs 2037 2038.. option:: -fms-compatibility, -fno-ms-compatibility 2039 2040Enable full Microsoft Visual C++ compatibility 2041 2042.. option:: -fms-compatibility-version=<arg> 2043 2044Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 2045 2046.. option:: -fms-extensions, -fno-ms-extensions 2047 2048Accept some non-standard constructs supported by the Microsoft compiler 2049 2050.. option:: -fms-hotpatch 2051 2052Ensure that all functions can be hotpatched at runtime 2053 2054.. option:: -fms-memptr-rep=<arg> 2055 2056 <arg> must be 'single', 'multiple' or 'virtual'. 2057 2058.. option:: -fms-volatile 2059 2060.. option:: -fmsc-version=<arg> 2061 2062Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 2063 2064.. option:: -fmudflap 2065 2066.. option:: -fmudflapth 2067 2068.. option:: -fnested-functions 2069 2070.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 2071 2072Specifies the largest alignment guaranteed by '::operator new(size\_t)' 2073 2074.. option:: -fnew-infallible, -fno-new-infallible 2075 2076Enable treating throwing global C++ operator new as always returning valid memory (annotates with \_\_attribute\_\_((returns\_nonnull)) and throw()). This is detectable in source. 2077 2078.. option:: -fnext-runtime 2079 2080.. option:: -fno-builtin-<arg> 2081 2082Disable implicit builtin knowledge of a specific function 2083 2084.. option:: -fno-elide-type 2085 2086Do not elide types when printing diagnostics 2087 2088.. option:: -fno-knr-functions 2089 2090Disable support for K&R C function declarations 2091 2092.. option:: -fno-max-type-align 2093 2094.. option:: -fno-strict-modules-decluse 2095 2096.. option:: -fno-temp-file 2097 2098Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes 2099 2100.. option:: -fno-working-directory 2101 2102.. option:: -fno\_modules-validate-input-files-content 2103 2104.. program:: clang1 2105.. option:: -fno\_pch-validate-input-files-content 2106.. program:: clang 2107 2108.. option:: -fnoxray-link-deps 2109 2110.. option:: -fobjc-abi-version=<arg> 2111 2112.. option:: -fobjc-arc, -fno-objc-arc 2113 2114Synthesize retain and release calls for Objective-C pointers 2115 2116.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 2117 2118Use EH-safe code when synthesizing retains and releases in -fobjc-arc 2119 2120.. option:: -fobjc-convert-messages-to-runtime-calls, -fno-objc-convert-messages-to-runtime-calls 2121 2122.. option:: -fobjc-disable-direct-methods-for-testing 2123 2124Ignore attribute objc\_direct so that direct methods can be tested 2125 2126.. option:: -fobjc-encode-cxx-class-template-spec, -fno-objc-encode-cxx-class-template-spec 2127 2128Fully encode c++ class template specialization 2129 2130.. option:: -fobjc-exceptions, -fno-objc-exceptions 2131 2132Enable Objective-C exceptions 2133 2134.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 2135 2136.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 2137 2138.. option:: -fobjc-link-runtime 2139 2140.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 2141 2142.. option:: -fobjc-nonfragile-abi-version=<arg> 2143 2144.. option:: -fobjc-runtime=<arg> 2145 2146Specify the target Objective-C runtime kind and version 2147 2148.. option:: -fobjc-sender-dependent-dispatch 2149 2150.. option:: -fobjc-weak, -fno-objc-weak 2151 2152Enable ARC-style weak references in Objective-C 2153 2154.. option:: -foffload-lto=<arg>, -foffload-lto (equivalent to -foffload-lto=full) 2155 2156Set LTO mode for offload compilation. <arg> must be 'thin' or 'full'. 2157 2158.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 2159 2160.. option:: -fopenmp, -fno-openmp 2161 2162Parse OpenMP pragmas and generate parallel code. 2163 2164.. option:: -fopenmp-extensions, -fno-openmp-extensions 2165 2166Enable all Clang extensions for OpenMP directives and clauses 2167 2168.. option:: -fopenmp-implicit-rpath, -fno-openmp-implicit-rpath 2169 2170Set rpath on OpenMP executables 2171 2172.. option:: -fopenmp-new-driver 2173 2174Use the new driver for OpenMP offloading. 2175 2176.. option:: -fopenmp-offload-mandatory 2177 2178Do not create a host fallback if offloading to the device fails. 2179 2180.. option:: -fopenmp-simd, -fno-openmp-simd 2181 2182Emit OpenMP code only for SIMD-based constructs. 2183 2184.. option:: -fopenmp-target-debug, -fno-openmp-target-debug 2185 2186Enable debugging in the OpenMP offloading device RTL 2187 2188.. option:: -fopenmp-version=<arg> 2189 2190Set OpenMP version (e.g. 45 for OpenMP 4.5, 50 for OpenMP 5.0). Default value is 50. 2191 2192.. program:: clang1 2193.. option:: -fopenmp=<arg> 2194.. program:: clang 2195 2196.. option:: -foperator-arrow-depth=<arg> 2197 2198.. option:: -foperator-names, -fno-operator-names 2199 2200.. option:: -foptimization-record-file=<file> 2201 2202Specify 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. 2203 2204.. option:: -foptimization-record-passes=<regex> 2205 2206Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) 2207 2208.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 2209 2210.. option:: -forder-file-instrumentation 2211 2212Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 2213 2214.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 2215 2216.. option:: -fpack-struct, -fno-pack-struct 2217 2218.. program:: clang1 2219.. option:: -fpack-struct=<arg> 2220.. program:: clang 2221 2222Specify the default maximum struct packing alignment 2223 2224.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 2225 2226Recognize and construct Pascal-style string literals 2227 2228.. option:: -fpass-plugin=<dsopath> 2229 2230Load pass plugin from a dynamic shared object file (only with new pass manager). 2231 2232.. option:: -fpatchable-function-entry=<N,M> 2233 2234Generate M NOPs before function entry and N-M NOPs after function entry 2235 2236.. option:: -fpcc-struct-return 2237 2238Override the default ABI to return all structs on the stack 2239 2240.. option:: -fpch-codegen, -fno-pch-codegen 2241 2242Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH 2243 2244.. option:: -fpch-debuginfo, -fno-pch-debuginfo 2245 2246Generate debug info for types in an object file built from this PCH and do not generate them elsewhere 2247 2248.. option:: -fpch-instantiate-templates, -fno-pch-instantiate-templates 2249 2250Instantiate templates already while building a PCH 2251 2252.. option:: -fpch-preprocess 2253 2254.. option:: -fpch-validate-input-files-content 2255 2256Validate PCH input files based on content if mtime differs 2257 2258.. option:: -fpic, -fno-pic 2259 2260.. option:: -fpie, -fno-pie 2261 2262.. option:: -fplt, -fno-plt 2263 2264.. option:: -fplugin=<dsopath> 2265 2266Load the named plugin (dynamic shared object) 2267 2268.. option:: -fprebuilt-implicit-modules, -fno-prebuilt-implicit-modules 2269 2270Look up implicit modules in the prebuilt module path 2271 2272.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 2273 2274.. option:: -fproc-stat-report<arg> 2275 2276Print subprocess statistics 2277 2278.. program:: clang1 2279.. option:: -fproc-stat-report=<arg> 2280.. program:: clang 2281 2282Save subprocess statistics to the given file 2283 2284.. option:: -fprofile-arcs, -fno-profile-arcs 2285 2286.. option:: -fprofile-dir=<arg> 2287 2288.. option:: -fprofile-exclude-files=<arg> 2289 2290Instrument only functions from files where names don't match all the regexes separated by a semi-colon 2291 2292.. option:: -fprofile-filter-files=<arg> 2293 2294Instrument only functions from files where names match any regex separated by a semi-colon 2295 2296.. option:: -fprofile-generate, -fno-profile-generate 2297 2298Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 2299 2300.. program:: clang1 2301.. option:: -fprofile-generate=<directory> 2302.. program:: clang 2303 2304Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 2305 2306.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 2307 2308Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 2309 2310.. program:: clang1 2311.. option:: -fprofile-instr-generate=<file> 2312.. program:: clang 2313 2314Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 2315 2316.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 2317 2318.. program:: clang1 2319.. option:: -fprofile-instr-use=<arg> 2320.. program:: clang 2321 2322Use instrumentation data for profile-guided optimization 2323 2324.. option:: -fprofile-list=<arg> 2325 2326Filename defining the list of functions/files to instrument 2327 2328.. option:: -fprofile-remapping-file=<file> 2329 2330Use the remappings described in <file> to match the profile data against names in the program 2331 2332.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 2333 2334Specifies that the sample profile is accurate. If the sample 2335 profile is accurate, callsites without profile samples are marked 2336 as cold. Otherwise, treat callsites without profile samples as if 2337 we have no profile 2338 2339.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 2340 2341.. program:: clang1 2342.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 2343.. program:: clang 2344 2345Enable sample-based profile guided optimizations 2346 2347.. option:: -fprofile-update=<method> 2348 2349Set update method of profile counters. <method> must be 'atomic', 'prefer-atomic' or 'single'. 2350 2351.. program:: clang1 2352.. option:: -fprofile-use=<pathname> 2353.. program:: clang 2354 2355Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 2356 2357.. option:: -fprotect-parens, -fno-protect-parens 2358 2359Determines whether the optimizer honors parentheses when floating-point expressions are evaluated 2360 2361.. option:: -fpseudo-probe-for-profiling, -fno-pseudo-probe-for-profiling 2362 2363Emit pseudo probes for sample profiling 2364 2365.. option:: -freciprocal-math, -fno-reciprocal-math 2366 2367Allow division operations to be reassociated 2368 2369.. option:: -freg-struct-return 2370 2371Override the default ABI to return small structs in registers 2372 2373.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 2374 2375Use atexit or \_\_cxa\_atexit to register global destructors 2376 2377.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 2378 2379Enable C++17 relaxed template template argument matching 2380 2381.. option:: -freroll-loops, -fno-reroll-loops 2382 2383Turn on loop reroller 2384 2385.. option:: -fretain-comments-from-system-headers 2386 2387.. option:: -frewrite-imports, -fno-rewrite-imports 2388 2389.. option:: -frewrite-includes, -fno-rewrite-includes 2390 2391.. option:: -frewrite-map-file=<arg> 2392 2393.. option:: -fropi, -fno-ropi 2394 2395Generate read-only position independent code (ARM only) 2396 2397.. option:: -frounding-math, -fno-rounding-math 2398 2399.. option:: -frtti, -fno-rtti 2400 2401.. option:: -frtti-data, -fno-rtti-data 2402 2403.. option:: -frwpi, -fno-rwpi 2404 2405Generate read-write position independent code (ARM only) 2406 2407.. option:: -fsanitize-memory-param-retval, -fno-sanitize-memory-param-retval 2408 2409Enable detection of uninitialized parameters and return values 2410 2411.. option:: -fsave-optimization-record, -fno-save-optimization-record 2412 2413Generate a YAML optimization record file 2414 2415.. program:: clang1 2416.. option:: -fsave-optimization-record=<format> 2417.. program:: clang 2418 2419Generate an optimization record file in a specific format 2420 2421.. option:: -fseh-exceptions 2422 2423Use SEH style exceptions 2424 2425.. option:: -fsemantic-interposition, -fno-semantic-interposition 2426 2427.. option:: -fshort-enums, -fno-short-enums 2428 2429Allocate to an enum type only as many bytes as it needs for the declared range of possible values 2430 2431.. option:: -fshort-wchar, -fno-short-wchar 2432 2433Force wchar\_t to be a short unsigned int 2434 2435.. option:: -fshow-column, -fno-show-column 2436 2437.. option:: -fshow-overloads=<arg> 2438 2439Which overload candidates to show when overload resolution fails. Defaults to 'all'. <arg> must be 'best' or 'all'. 2440 2441.. option:: -fshow-source-location, -fno-show-source-location 2442 2443.. option:: -fsignaling-math, -fno-signaling-math 2444 2445.. option:: -fsigned-bitfields 2446 2447.. option:: -fsigned-char, -fno-signed-char, --signed-char 2448 2449char is signed 2450 2451.. option:: -fsigned-zeros, -fno-signed-zeros 2452 2453.. option:: -fsized-deallocation, -fno-sized-deallocation 2454 2455Enable C++14 sized global deallocation functions 2456 2457.. option:: -fsjlj-exceptions 2458 2459Use SjLj style exceptions 2460 2461.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 2462 2463Enable the superword-level parallelism vectorization passes 2464 2465.. option:: -fspell-checking, -fno-spell-checking 2466 2467.. option:: -fspell-checking-limit=<arg> 2468 2469.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 2470 2471Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 2472 2473.. option:: -fsplit-lto-unit, -fno-split-lto-unit 2474 2475Enables splitting of the LTO unit 2476 2477.. option:: -fsplit-machine-functions, -fno-split-machine-functions 2478 2479Enable late function splitting using profile information (x86 ELF) 2480 2481.. option:: -fsplit-stack, -fno-split-stack 2482 2483Use segmented stack 2484 2485.. option:: -fstack-clash-protection, -fno-stack-clash-protection 2486 2487Enable stack clash protection 2488 2489.. option:: -fstack-protector, -fno-stack-protector 2490 2491Enable 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. 2492 2493.. option:: -fstack-protector-all 2494 2495Enable stack protectors for all functions 2496 2497.. option:: -fstack-protector-strong 2498 2499Enable 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 2500 2501.. option:: -fstack-size-section, -fno-stack-size-section 2502 2503Emit section containing metadata on function stack sizes 2504 2505.. option:: -fstack-usage 2506 2507Emit .su file containing information on function stack sizes 2508 2509.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 2510 2511Emit full debug info for all types used by the program 2512 2513.. option:: -fstrict-aliasing, -fno-strict-aliasing 2514 2515.. option:: -fstrict-enums, -fno-strict-enums 2516 2517Enable optimizations based on the strict definition of an enum's value range 2518 2519.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 2520 2521Assume that overflowing float-to-int casts are undefined (default) 2522 2523.. option:: -fstrict-overflow, -fno-strict-overflow 2524 2525.. option:: -fstrict-return, -fno-strict-return 2526 2527.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 2528 2529Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 2530 2531.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 2532 2533.. option:: -fswift-async-fp=<option> 2534 2535Control emission of Swift async extended frame info. <option> must be 'auto', 'always' or 'never'. 2536 2537.. option:: -fsymbol-partition=<arg> 2538 2539.. option:: -ftabstop=<arg> 2540 2541.. option:: -ftemplate-backtrace-limit=<arg> 2542 2543.. option:: -ftemplate-depth-<arg> 2544 2545.. option:: -ftemplate-depth=<arg> 2546 2547.. option:: -ftest-coverage, -fno-test-coverage 2548 2549.. option:: -fthin-link-bitcode=<arg> 2550 2551Write minimized bitcode to <file> for the ThinLTO thin link only 2552 2553.. option:: -fthinlto-index=<arg> 2554 2555Perform ThinLTO importing using provided function summary index 2556 2557.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 2558 2559.. option:: -ftime-report 2560 2561.. program:: clang1 2562.. option:: -ftime-report=<arg> 2563.. program:: clang 2564 2565(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'. 2566 2567.. option:: -ftime-trace 2568 2569 2570Turn on time profiler. Generates JSON file based on output filename. Results 2571can be analyzed with chrome://tracing or `Speedscope App 2572<https://www.speedscope.app>`_ for flamegraph visualization. 2573 2574.. option:: -ftime-trace-granularity=<arg> 2575 2576Minimum time granularity (in microseconds) traced by time profiler 2577 2578.. option:: -ftls-model=<arg> 2579 2580 <arg> must be 'global-dynamic', 'local-dynamic', 'initial-exec' or 'local-exec'. 2581 2582.. option:: -ftrap-function=<arg> 2583 2584Issue call to specified function rather than a trap instruction 2585 2586.. option:: -ftrapping-math, -fno-trapping-math 2587 2588.. option:: -ftrapv 2589 2590Trap on integer overflow 2591 2592.. option:: -ftrapv-handler <arg> 2593 2594.. program:: clang1 2595.. option:: -ftrapv-handler=<function name> 2596.. program:: clang 2597 2598Specify the function to be called on overflow 2599 2600.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 2601 2602Process trigraph sequences 2603 2604.. option:: -ftrivial-auto-var-init-stop-after=<arg> 2605 2606Stop initializing trivial automatic stack variables after the specified number of instances 2607 2608.. option:: -ftrivial-auto-var-init=<arg> 2609 2610Initialize trivial automatic stack variables. Defaults to 'uninitialized'. <arg> must be 'uninitialized', 'zero' or 'pattern'. 2611 2612.. option:: -funique-basic-block-section-names, -fno-unique-basic-block-section-names 2613 2614Use unique names for basic block sections (ELF Only) 2615 2616.. option:: -funique-internal-linkage-names, -fno-unique-internal-linkage-names 2617 2618Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path 2619 2620.. option:: -funique-section-names, -fno-unique-section-names 2621 2622.. option:: -funroll-loops, -fno-unroll-loops 2623 2624Turn on loop unroller 2625 2626.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 2627 2628.. option:: -funsigned-bitfields 2629 2630.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 2631 2632.. option:: -funstable, -fno-unstable 2633 2634Enable unstable and experimental features 2635 2636.. option:: -funwind-tables, -fno-unwind-tables 2637 2638.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 2639 2640.. option:: -fuse-init-array, -fno-use-init-array 2641 2642.. option:: -fstrict-flex-arrays=<arg>, -fno-strict-flex-arrays 2643 2644Control which arrays are considered as flexible arrays members. <arg> 2645can be 1 (array of size 0, 1 and undefined are considered), 2 (array of size 0 2646and undefined are considered) or 3 (only array of undefined size are considered). 2647 2648.. option:: -fuse-ld=<arg> 2649 2650.. option:: -fuse-line-directives, -fno-use-line-directives 2651 2652Use #line in preprocessed output 2653 2654.. option:: -fvalidate-ast-input-files-content 2655 2656Compute 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 2657 2658.. option:: -fveclib=<arg> 2659 2660Use the given vector functions library. <arg> must be 'Accelerate', 'libmvec', 'MASSV', 'SVML', 'Darwin_libsystem_m' or 'none'. 2661 2662.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2663 2664Enable the loop vectorization passes 2665 2666.. option:: -fverbose-asm, -dA, -fno-verbose-asm 2667 2668Generate verbose assembly output 2669 2670.. option:: -fvirtual-function-elimination, -fno-virtual-function-elimination 2671 2672Enables dead virtual function elimination optimization. Requires -flto=full 2673 2674.. option:: -fvisibility-dllexport=<arg> 2675 2676The visibility for dllexport definitions \[-fvisibility-from-dllstorageclass\]. <arg> must be 'default', 'hidden', 'internal' or 'protected'. 2677 2678.. option:: -fvisibility-externs-dllimport=<arg> 2679 2680The visibility for dllimport external declarations \[-fvisibility-from-dllstorageclass\]. <arg> must be 'default', 'hidden', 'internal' or 'protected'. 2681 2682.. option:: -fvisibility-externs-nodllstorageclass=<arg> 2683 2684The visibility for external declarations without an explicit DLL dllstorageclass \[-fvisibility-from-dllstorageclass\]. <arg> must be 'default', 'hidden', 'internal' or 'protected'. 2685 2686.. option:: -fvisibility-from-dllstorageclass, -fno-visibility-from-dllstorageclass 2687 2688Set the visibility of symbols in the generated code from their DLL storage class 2689 2690.. option:: -fvisibility-global-new-delete-hidden 2691 2692Give global C++ operator new and delete declarations hidden visibility 2693 2694.. option:: -fvisibility-inlines-hidden, -fno-visibility-inlines-hidden 2695 2696Give inline C++ member functions hidden visibility by default 2697 2698.. option:: -fvisibility-inlines-hidden-static-local-var, -fno-visibility-inlines-hidden-static-local-var 2699 2700When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default 2701 2702.. option:: -fvisibility-ms-compat 2703 2704Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2705 2706.. option:: -fvisibility-nodllstorageclass=<arg> 2707 2708The visibility for definitions without an explicit DLL export class \[-fvisibility-from-dllstorageclass\]. <arg> must be 'default', 'hidden', 'internal' or 'protected'. 2709 2710.. option:: -fvisibility=<arg> 2711 2712Set the default symbol visibility for all global declarations. <arg> must be 'hidden' or 'default'. 2713 2714.. option:: -fwasm-exceptions 2715 2716Use WebAssembly style exceptions 2717 2718.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2719 2720Enables whole-program vtable optimization. Requires -flto 2721 2722.. option:: -fwrapv, -fno-wrapv 2723 2724Treat signed integer overflow as two's complement 2725 2726.. option:: -fwritable-strings 2727 2728Store string literals as writable data 2729 2730.. option:: -fxl-pragma-pack, -fno-xl-pragma-pack 2731 2732Enable IBM XL #pragma pack handling 2733 2734.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2735 2736Always emit \_\_xray\_customevent(...) calls even if the containing function is not always instrumented 2737 2738.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2739 2740Always emit \_\_xray\_typedevent(...) calls even if the containing function is not always instrumented 2741 2742.. option:: -fxray-always-instrument=<arg> 2743 2744DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2745 2746.. option:: -fxray-attr-list=<arg> 2747 2748Filename defining the list of functions/types for imbuing XRay attributes. 2749 2750.. option:: -fxray-function-groups=<arg> 2751 2752Only instrument 1 of N groups 2753 2754.. option:: -fxray-function-index, -fno-xray-function-index 2755 2756.. option:: -fxray-ignore-loops, -fno-xray-ignore-loops 2757 2758Don't instrument functions with loops unless they also meet the minimum function size 2759 2760.. option:: -fxray-instruction-threshold<arg> 2761 2762.. program:: clang1 2763.. option:: -fxray-instruction-threshold=<arg> 2764.. program:: clang 2765 2766Sets the minimum function size to instrument with XRay 2767 2768.. option:: -fxray-instrument, -fno-xray-instrument 2769 2770Generate XRay instrumentation sleds on function entry and exit 2771 2772.. option:: -fxray-instrumentation-bundle=<arg> 2773 2774Select 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'. 2775 2776.. option:: -fxray-link-deps 2777 2778Tells clang to add the link dependencies for XRay. 2779 2780.. option:: -fxray-modes=<arg> 2781 2782List of modes to link in by default into XRay instrumented binaries. 2783 2784.. option:: -fxray-never-instrument=<arg> 2785 2786DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2787 2788.. option:: -fxray-selected-function-group=<arg> 2789 2790When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1 2791 2792.. option:: -fzero-call-used-regs=<arg> 2793 2794Clear 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'. 2795 2796.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2797 2798.. option:: -fzvector, -fno-zvector, -mzvector 2799 2800Enable System z vector language extension 2801 2802.. option:: --gpu-bundle-output, --no-gpu-bundle-output 2803 2804Bundle output files of HIP device compilation 2805 2806.. option:: --offload-new-driver, --no-offload-new-driver 2807 2808Use the new driver for offloading compilation. 2809 2810.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2811 2812Warn on language extensions 2813 2814.. option:: -pedantic-errors, --pedantic-errors 2815 2816OpenCL flags 2817------------ 2818.. option:: -cl-denorms-are-zero 2819 2820OpenCL only. Allow denormals to be flushed to zero. 2821 2822.. option:: -cl-ext=<arg1>,<arg2>... 2823 2824OpenCL 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 '-'. 2825 2826.. option:: -cl-fast-relaxed-math 2827 2828OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2829 2830.. option:: -cl-finite-math-only 2831 2832OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2833 2834.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2835 2836OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2837 2838.. option:: -cl-kernel-arg-info 2839 2840OpenCL only. Generate kernel argument metadata. 2841 2842.. option:: -cl-mad-enable 2843 2844OpenCL only. Allow use of less precise MAD computations in the generated binary. 2845 2846.. option:: -cl-no-signed-zeros 2847 2848OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2849 2850.. option:: -cl-no-stdinc 2851 2852OpenCL only. Disables all standard includes containing non-native compiler types and functions. 2853 2854.. option:: -cl-opt-disable 2855 2856OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2857 2858.. option:: -cl-single-precision-constant 2859 2860OpenCL only. Treat double precision floating-point constant as single precision constant. 2861 2862.. option:: -cl-std=<arg> 2863 2864OpenCL 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'. 2865 2866.. option:: -cl-strict-aliasing 2867 2868OpenCL only. This option is added for compatibility with OpenCL 1.0. 2869 2870.. option:: -cl-uniform-work-group-size 2871 2872OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2873 2874.. option:: -cl-unsafe-math-optimizations 2875 2876OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2877 2878SYCL flags 2879---------- 2880.. option:: -fsycl, -fno-sycl 2881 2882Enables SYCL kernels compilation for device 2883 2884.. option:: -sycl-std=<arg> 2885 2886SYCL language standard to compile for. <arg> must be '2020', '2017', '121', '1.2.1' or 'sycl-1.2.1'. 2887 2888Target-dependent compilation options 2889~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2890.. option:: -G<size>, -G=<arg>, -msmall-data-limit=<arg>, -msmall-data-threshold=<arg> 2891 2892Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2893 2894.. option:: -ffixed-x1 2895 2896Reserve the x1 register (AArch64/RISC-V only) 2897 2898.. option:: -ffixed-x10 2899 2900Reserve the x10 register (AArch64/RISC-V only) 2901 2902.. option:: -ffixed-x11 2903 2904Reserve the x11 register (AArch64/RISC-V only) 2905 2906.. option:: -ffixed-x12 2907 2908Reserve the x12 register (AArch64/RISC-V only) 2909 2910.. option:: -ffixed-x13 2911 2912Reserve the x13 register (AArch64/RISC-V only) 2913 2914.. option:: -ffixed-x14 2915 2916Reserve the x14 register (AArch64/RISC-V only) 2917 2918.. option:: -ffixed-x15 2919 2920Reserve the x15 register (AArch64/RISC-V only) 2921 2922.. option:: -ffixed-x16 2923 2924Reserve the x16 register (AArch64/RISC-V only) 2925 2926.. option:: -ffixed-x17 2927 2928Reserve the x17 register (AArch64/RISC-V only) 2929 2930.. option:: -ffixed-x18 2931 2932Reserve the x18 register (AArch64/RISC-V only) 2933 2934.. option:: -ffixed-x19 2935 2936Reserve the x19 register (AArch64/RISC-V only) 2937 2938.. option:: -ffixed-x2 2939 2940Reserve the x2 register (AArch64/RISC-V only) 2941 2942.. option:: -ffixed-x20 2943 2944Reserve the x20 register (AArch64/RISC-V only) 2945 2946.. option:: -ffixed-x21 2947 2948Reserve the x21 register (AArch64/RISC-V only) 2949 2950.. option:: -ffixed-x22 2951 2952Reserve the x22 register (AArch64/RISC-V only) 2953 2954.. option:: -ffixed-x23 2955 2956Reserve the x23 register (AArch64/RISC-V only) 2957 2958.. option:: -ffixed-x24 2959 2960Reserve the x24 register (AArch64/RISC-V only) 2961 2962.. option:: -ffixed-x25 2963 2964Reserve the x25 register (AArch64/RISC-V only) 2965 2966.. option:: -ffixed-x26 2967 2968Reserve the x26 register (AArch64/RISC-V only) 2969 2970.. option:: -ffixed-x27 2971 2972Reserve the x27 register (AArch64/RISC-V only) 2973 2974.. option:: -ffixed-x28 2975 2976Reserve the x28 register (AArch64/RISC-V only) 2977 2978.. option:: -ffixed-x29 2979 2980Reserve the x29 register (AArch64/RISC-V only) 2981 2982.. option:: -ffixed-x3 2983 2984Reserve the x3 register (AArch64/RISC-V only) 2985 2986.. option:: -ffixed-x30 2987 2988Reserve the x30 register (AArch64/RISC-V only) 2989 2990.. option:: -ffixed-x31 2991 2992Reserve the x31 register (AArch64/RISC-V only) 2993 2994.. option:: -ffixed-x4 2995 2996Reserve the x4 register (AArch64/RISC-V only) 2997 2998.. option:: -ffixed-x5 2999 3000Reserve the x5 register (AArch64/RISC-V only) 3001 3002.. option:: -ffixed-x6 3003 3004Reserve the x6 register (AArch64/RISC-V only) 3005 3006.. option:: -ffixed-x7 3007 3008Reserve the x7 register (AArch64/RISC-V only) 3009 3010.. option:: -ffixed-x8 3011 3012Reserve the x8 register (AArch64/RISC-V only) 3013 3014.. option:: -ffixed-x9 3015 3016Reserve the x9 register (AArch64/RISC-V only) 3017 3018.. option:: -ffuchsia-api-level=<arg> 3019 3020Set Fuchsia API level 3021 3022.. option:: -inline-asm=<arg> 3023 3024 <arg> must be 'att' or 'intel'. 3025 3026.. option:: -m16 3027 3028.. option:: -m32 3029 3030.. option:: -m64 3031 3032.. option:: -mabi=<arg> 3033 3034.. program:: clang1 3035.. option:: -mabi=vec-default 3036.. program:: clang 3037 3038Enable the default Altivec ABI on AIX (AIX only). Uses only volatile vector registers. 3039 3040.. program:: clang2 3041.. option:: -mabi=vec-extabi 3042.. program:: clang 3043 3044Enable the extended Altivec ABI on AIX (AIX only). Uses volatile and nonvolatile vector registers 3045 3046.. option:: -maix-struct-return 3047 3048Return all structs in memory (PPC32 only) 3049 3050.. option:: -malign-branch-boundary=<arg> 3051 3052Specify the boundary's size to align branches 3053 3054.. option:: -malign-branch=<arg1>,<arg2>... 3055 3056Specify types of branches to align 3057 3058.. option:: -malign-double 3059 3060Align doubles to two words in structs (x86 only) 3061 3062.. option:: -mamdgpu-ieee, -mno-amdgpu-ieee 3063 3064Sets 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) 3065 3066.. option:: -march=<arg> 3067 3068.. option:: -masm=<arg> 3069 3070.. option:: -mbackchain, -mno-backchain 3071 3072Link stack frames through backchain on System Z 3073 3074.. option:: -mbranch-protection=<arg> 3075 3076Enforce targets of indirect branches and function returns 3077 3078.. option:: -mbranches-within-32B-boundaries 3079 3080Align selected branches (fused, jcc, jmp) within 32-byte boundary 3081 3082.. option:: -mcmodel=<arg>, -mcmodel=medany (equivalent to -mcmodel=medium), -mcmodel=medlow (equivalent to -mcmodel=small) 3083 3084.. option:: -mcode-object-v3, -mno-code-object-v3 3085 3086Legacy option to specify code object ABI V3 (AMDGPU only) 3087 3088.. option:: -mcode-object-version=<arg> 3089 3090Specify code object ABI version. Defaults to 4. (AMDGPU only). <arg> must be 'none', '2', '3', '4' or '5'. 3091 3092.. option:: -mconsole<arg> 3093 3094.. program:: clang1 3095.. 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) 3096.. program:: clang 3097 3098.. option:: -mcrc, -mno-crc 3099 3100Allow use of CRC instructions (ARM/Mips only) 3101 3102.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 3103 3104.. option:: -mdefault-visibility-export-mapping=<arg> 3105 3106Mapping between default visibility and export. <arg> must be 'none', 'explicit' or 'all'. 3107 3108.. option:: -mdll<arg> 3109 3110.. option:: -mdouble=<n 3111 3112Force double to be <n> bits. <n must be '32' or '64'. 3113 3114.. option:: -mdynamic-no-pic<arg> 3115 3116.. option:: -meabi <arg> 3117 3118Set EABI type. Default depends on triple). <arg> must be 'default', '4', '5' or 'gnu'. 3119 3120.. option:: -menable-experimental-extensions 3121 3122Enable use of experimental RISC-V extensions. 3123 3124.. option:: -mfentry 3125 3126Insert calls to fentry at function entry (x86/SystemZ only) 3127 3128.. option:: -mfloat-abi=<arg> 3129 3130 <arg> must be 'soft', 'softfp' or 'hard'. 3131 3132.. option:: -mfpmath=<arg> 3133 3134.. option:: -mfpu=<arg> 3135 3136.. option:: -mgeneral-regs-only 3137 3138Generate code which only uses the general purpose registers (AArch64/x86 only) 3139 3140.. option:: -mglobal-merge, -mno-global-merge 3141 3142Enable merging of globals 3143 3144.. option:: -mhard-float 3145 3146.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 3147 3148.. option:: -mhwmult=<arg> 3149 3150.. option:: -miamcu, -mno-iamcu 3151 3152Use Intel MCU ABI 3153 3154.. option:: -mibt-seal 3155 3156Optimize fcf-protection=branch/full (requires LTO). 3157 3158.. option:: -mignore-xcoff-visibility 3159 3160Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file 3161 3162.. option:: -mimplicit-float, -mno-implicit-float 3163 3164.. option:: -mimplicit-it=<arg> 3165 3166.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 3167 3168(integrated-as) Emit an object file which can be used with an incremental linker 3169 3170.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 3171 3172.. option:: -mkernel 3173 3174.. option:: -mlong-calls, -mno-long-calls 3175 3176Generate branches with extended addressability, usually via indirect jumps. 3177 3178.. option:: -mlvi-cfi, -mno-lvi-cfi 3179 3180Enable only control-flow mitigations for Load Value Injection (LVI) 3181 3182.. option:: -mlvi-hardening, -mno-lvi-hardening 3183 3184Enable all mitigations for Load Value Injection (LVI) 3185 3186.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 3187 3188Set Mac OS X deployment target 3189 3190.. option:: -mmcu=<arg> 3191 3192.. option:: -mms-bitfields, -mno-ms-bitfields 3193 3194Set the default structure layout to be compatible with the Microsoft compiler standard 3195 3196.. option:: -mnop-mcount 3197 3198Generate mcount/\_\_fentry\_\_ calls as nops. To activate they need to be patched in. 3199 3200.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 3201 3202Omit frame pointer setup for leaf functions 3203 3204.. option:: -moslib=<arg> 3205 3206.. option:: -mpacked-stack, -mno-packed-stack 3207 3208Use packed stack layout (SystemZ only). 3209 3210.. option:: -mpad-max-prefix-size=<arg> 3211 3212Specify maximum number of prefixes to use for padding 3213 3214.. option:: -mprefer-vector-width=<arg> 3215 3216Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 3217 3218.. option:: -mqdsp6-compat 3219 3220Enable hexagon-qdsp6 backward compatibility 3221 3222.. option:: -mrecip 3223 3224.. program:: clang1 3225.. option:: -mrecip=<arg1>,<arg2>... 3226.. program:: clang 3227 3228.. option:: -mrecord-mcount 3229 3230Generate a \_\_mcount\_loc section entry for each \_\_fentry\_\_ call. 3231 3232.. option:: -mred-zone, -mno-red-zone 3233 3234.. option:: -mregparm=<arg> 3235 3236.. option:: -mrelax, -mno-relax 3237 3238Enable linker relaxation 3239 3240.. option:: -mrelax-all, -mno-relax-all 3241 3242(integrated-as) Relax all machine instructions 3243 3244.. option:: -mretpoline, -mno-retpoline 3245 3246.. option:: -mrtd, -mno-rtd 3247 3248Make StdCall calling convention the default 3249 3250.. option:: -mseses, -mno-seses 3251 3252Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations 3253 3254.. option:: -msign-return-address=<arg> 3255 3256Select return address signing scope. <arg> must be 'none', 'all' or 'non-leaf'. 3257 3258.. option:: -msim 3259 3260.. option:: -mskip-rax-setup, -mno-skip-rax-setup 3261 3262Skip setting up RAX register when passing variable arguments (x86 only) 3263 3264.. option:: -msoft-float, -mno-soft-float 3265 3266Use software floating point 3267 3268.. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening 3269 3270.. option:: -mstack-alignment=<arg> 3271 3272Set the stack alignment 3273 3274.. option:: -mstack-arg-probe, -mno-stack-arg-probe 3275 3276Enable stack probes 3277 3278.. option:: -mstack-probe-size=<arg> 3279 3280Set the stack probe size 3281 3282.. option:: -mstack-protector-guard-offset=<arg> 3283 3284Use the given offset for addressing the stack-protector guard 3285 3286.. option:: -mstack-protector-guard-reg=<arg> 3287 3288Use the given reg for addressing the stack-protector guard 3289 3290.. option:: -mstack-protector-guard=<arg> 3291 3292Use the given guard (global, tls) for addressing the stack-protector guard 3293 3294.. option:: -mstackrealign, -mno-stackrealign 3295 3296Force realign the stack at entry to every function 3297 3298.. option:: -msvr4-struct-return 3299 3300Return small structs in registers (PPC32 only) 3301 3302.. option:: -mtargetos=<arg> 3303 3304Set the deployment target to be the specified OS and OS version 3305 3306.. option:: -mthread-model <arg> 3307 3308The thread model to use. Defaults to 'posix'). <arg> must be 'posix' or 'single'. 3309 3310.. option:: -mthreads<arg> 3311 3312.. option:: -mthumb, -mno-thumb 3313 3314.. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs 3315 3316Enable direct TLS access through segment registers (default) 3317 3318.. option:: -mtls-size=<arg> 3319 3320Specify 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) 3321 3322.. program:: clang1 3323.. option:: -mtune=<arg> 3324.. program:: clang 3325 3326Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC. 3327 3328.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 3329 3330.. option:: -municode<arg> 3331 3332.. option:: -munsafe-fp-atomics, -mno-unsafe-fp-atomics 3333 3334Enable unsafe floating point atomic instructions (AMDGPU only) 3335 3336.. option:: -mvx, -mno-vx 3337 3338.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 3339 3340.. option:: -mwatchos-version-min=<arg> 3341 3342.. option:: -mwavefrontsize64, -mno-wavefrontsize64 3343 3344Specify wavefront size 64 mode (AMDGPU only) 3345 3346.. option:: -mwindows<arg> 3347 3348.. option:: -mx32 3349 3350AARCH64 3351------- 3352.. option:: -fcall-saved-x10 3353 3354Make the x10 register call-saved (AArch64 only) 3355 3356.. option:: -fcall-saved-x11 3357 3358Make the x11 register call-saved (AArch64 only) 3359 3360.. option:: -fcall-saved-x12 3361 3362Make the x12 register call-saved (AArch64 only) 3363 3364.. option:: -fcall-saved-x13 3365 3366Make the x13 register call-saved (AArch64 only) 3367 3368.. option:: -fcall-saved-x14 3369 3370Make the x14 register call-saved (AArch64 only) 3371 3372.. option:: -fcall-saved-x15 3373 3374Make the x15 register call-saved (AArch64 only) 3375 3376.. option:: -fcall-saved-x18 3377 3378Make the x18 register call-saved (AArch64 only) 3379 3380.. option:: -fcall-saved-x8 3381 3382Make the x8 register call-saved (AArch64 only) 3383 3384.. option:: -fcall-saved-x9 3385 3386Make the x9 register call-saved (AArch64 only) 3387 3388.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 3389 3390Workaround Cortex-A53 erratum 835769 (AArch64 only) 3391 3392.. option:: -mmark-bti-property 3393 3394Add .note.gnu.property with BTI to assembly files (AArch64 only) 3395 3396.. option:: -msve-vector-bits=<arg> 3397 3398Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only) 3399 3400.. option:: -mvscale-max=<arg> 3401 3402Specify the vscale maximum. Defaults to the vector length agnostic value of "0". (AArch64 only) 3403 3404.. option:: -mvscale-min=<arg> 3405 3406Specify the vscale minimum. Defaults to "1". (AArch64 only) 3407 3408AMDGPU 3409------ 3410.. option:: -mcumode, -mno-cumode 3411 3412Specify CU wavefront execution mode (AMDGPU only) 3413 3414.. option:: -mtgsplit, -mno-tgsplit 3415 3416Enable threadgroup split execution mode (AMDGPU only) 3417 3418ARM 3419--- 3420.. option:: -faapcs-bitfield-load 3421 3422Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only). 3423 3424.. option:: -faapcs-bitfield-width, -fno-aapcs-bitfield-width 3425 3426Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only). 3427 3428.. option:: -ffixed-r9 3429 3430Reserve the r9 register (ARM only) 3431 3432.. option:: -mcmse 3433 3434Allow use of CMSE (Armv8-M Security Extensions) 3435 3436.. option:: -mexecute-only, -mno-execute-only, -mpure-code 3437 3438Disallow generation of data access to code sections (ARM only) 3439 3440.. option:: -mfix-cmse-cve-2021-35465, -mno-fix-cmse-cve-2021-35465 3441 3442Work around VLLDM erratum CVE-2021-35465 (ARM only) 3443 3444.. option:: -mfix-cortex-a57-aes-1742098, -mfix-cortex-a72-aes-1655431, -mno-fix-cortex-a57-aes-1742098 3445 3446Work around Cortex-A57 Erratum 1742098 (ARM only) 3447 3448.. option:: -mno-bti-at-return-twice 3449 3450Do not add a BTI instruction after a setjmp or other return-twice construct (Arm/AArch64 only) 3451 3452.. option:: -mno-movt 3453 3454Disallow use of movt/movw pairs (ARM only) 3455 3456.. option:: -mno-neg-immediates 3457 3458Disallow converting instructions with negative immediates to their negation or inversion. 3459 3460.. option:: -mnocrc 3461 3462Disallow use of CRC instructions (ARM only) 3463 3464.. option:: -mrestrict-it, -mno-restrict-it 3465 3466Disallow generation of complex IT blocks. 3467 3468.. option:: -mtp=<arg> 3469 3470Thread pointer access method (AArch32/AArch64 only). <arg> must be 'soft', 'cp15', 'el0', 'el1', 'el2' or 'el3'. 3471 3472.. option:: -munaligned-access, -mno-unaligned-access 3473 3474Allow memory accesses to be unaligned (AArch32/AArch64 only) 3475 3476Hexagon 3477------- 3478.. option:: -mhvx-ieee-fp, -mno-hvx-ieee-fp 3479 3480Enable Hexagon HVX IEEE floating-point 3481 3482.. option:: -mieee-rnd-near 3483 3484.. option:: -mmemops, -mno-memops 3485 3486Enable generation of memop instructions 3487 3488.. option:: -mnvj, -mno-nvj 3489 3490Enable generation of new-value jumps 3491 3492.. option:: -mnvs, -mno-nvs 3493 3494Enable generation of new-value stores 3495 3496.. option:: -mpackets, -mno-packets 3497 3498Enable generation of instruction packets 3499 3500Hexagon 3501------- 3502.. option:: -mhvx, -mno-hvx 3503 3504Enable Hexagon Vector eXtensions 3505 3506.. option:: -mhvx-length=<arg> 3507 3508Set Hexagon Vector Length. <arg> must be '64B' or '128B'. 3509 3510.. option:: -mhvx-qfloat, -mno-hvx-qfloat 3511 3512Enable Hexagon HVX QFloat instructions 3513 3514.. program:: clang1 3515.. option:: -mhvx=<arg> 3516.. program:: clang 3517 3518Enable Hexagon Vector eXtensions 3519 3520M68k 3521---- 3522.. option:: -ffixed-a0 3523 3524Reserve the a0 register (M68k only) 3525 3526.. option:: -ffixed-a1 3527 3528Reserve the a1 register (M68k only) 3529 3530.. option:: -ffixed-a2 3531 3532Reserve the a2 register (M68k only) 3533 3534.. option:: -ffixed-a3 3535 3536Reserve the a3 register (M68k only) 3537 3538.. option:: -ffixed-a4 3539 3540Reserve the a4 register (M68k only) 3541 3542.. option:: -ffixed-a5 3543 3544Reserve the a5 register (M68k only) 3545 3546.. option:: -ffixed-a6 3547 3548Reserve the a6 register (M68k only) 3549 3550.. option:: -ffixed-d0 3551 3552Reserve the d0 register (M68k only) 3553 3554.. option:: -ffixed-d1 3555 3556Reserve the d1 register (M68k only) 3557 3558.. option:: -ffixed-d2 3559 3560Reserve the d2 register (M68k only) 3561 3562.. option:: -ffixed-d3 3563 3564Reserve the d3 register (M68k only) 3565 3566.. option:: -ffixed-d4 3567 3568Reserve the d4 register (M68k only) 3569 3570.. option:: -ffixed-d5 3571 3572Reserve the d5 register (M68k only) 3573 3574.. option:: -ffixed-d6 3575 3576Reserve the d6 register (M68k only) 3577 3578.. option:: -ffixed-d7 3579 3580Reserve the d7 register (M68k only) 3581 3582.. option:: -m68000 3583 3584.. option:: -m68010 3585 3586.. option:: -m68020 3587 3588.. option:: -m68030 3589 3590.. option:: -m68040 3591 3592.. option:: -m68060 3593 3594MIPS 3595---- 3596.. option:: -mabicalls, -mno-abicalls 3597 3598Enable SVR4-style position-independent code (Mips only) 3599 3600.. option:: -mabs=<arg> 3601 3602.. option:: -mcheck-zero-division, -mno-check-zero-division 3603 3604.. option:: -mcompact-branches=<arg> 3605 3606.. option:: -mdouble-float 3607 3608.. option:: -mdsp, -mno-dsp 3609 3610.. option:: -mdspr2, -mno-dspr2 3611 3612.. option:: -membedded-data, -mno-embedded-data 3613 3614Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 3615 3616.. option:: -mextern-sdata, -mno-extern-sdata 3617 3618Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 3619 3620.. option:: -mfix4300 3621 3622.. option:: -mfp32 3623 3624Use 32-bit floating point registers (MIPS only) 3625 3626.. option:: -mfp64 3627 3628Use 64-bit floating point registers (MIPS only) 3629 3630.. option:: -mginv, -mno-ginv 3631 3632.. option:: -mgpopt, -mno-gpopt 3633 3634Use GP relative accesses for symbols known to be in a small data section (MIPS) 3635 3636.. option:: -mindirect-jump=<arg> 3637 3638Change indirect jump instructions to inhibit speculation 3639 3640.. option:: -mips16 3641 3642.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 3643 3644.. option:: -mlocal-sdata, -mno-local-sdata 3645 3646Extend the -G behaviour to object local data (MIPS) 3647 3648.. option:: -mmadd4, -mno-madd4 3649 3650Enable the generation of 4-operand madd.s, madd.d and related instructions. 3651 3652.. option:: -mmicromips, -mno-micromips 3653 3654.. option:: -mmsa, -mno-msa 3655 3656Enable MSA ASE (MIPS only) 3657 3658.. option:: -mmt, -mno-mt 3659 3660Enable MT ASE (MIPS only) 3661 3662.. option:: -mnan=<arg> 3663 3664.. option:: -mno-mips16 3665 3666.. option:: -msingle-float 3667 3668.. option:: -mvirt, -mno-virt 3669 3670.. option:: -mxgot, -mno-xgot 3671 3672PowerPC 3673------- 3674.. option:: -maltivec, -mno-altivec 3675 3676.. option:: -mcmpb, -mno-cmpb 3677 3678.. option:: -mcrbits, -mno-crbits 3679 3680.. option:: -mcrypto, -mno-crypto 3681 3682.. option:: -mdirect-move, -mno-direct-move 3683 3684.. option:: -mefpu2 3685 3686.. option:: -mfloat128, -mno-float128 3687 3688.. option:: -mfprnd, -mno-fprnd 3689 3690.. option:: -mhtm, -mno-htm 3691 3692.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 3693 3694.. option:: -misel, -mno-isel 3695 3696.. option:: -mlongcall, -mno-longcall 3697 3698.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 3699 3700.. option:: -mmma, -mno-mma 3701 3702.. option:: -mpaired-vector-memops, -mno-paired-vector-memops 3703 3704.. option:: -mpcrel, -mno-pcrel 3705 3706.. option:: -mpopcntd, -mno-popcntd 3707 3708.. option:: -mpower10-vector, -mno-power10-vector 3709 3710.. option:: -mpower8-vector, -mno-power8-vector 3711 3712.. option:: -mpower9-vector, -mno-power9-vector 3713 3714.. option:: -mprefixed, -mno-prefixed 3715 3716.. option:: -mprivileged 3717 3718.. option:: -mrop-protect 3719 3720.. option:: -msecure-plt 3721 3722.. option:: -mspe, -mno-spe 3723 3724.. option:: -mvsx, -mno-vsx 3725 3726WebAssembly 3727----------- 3728.. option:: -matomics, -mno-atomics 3729 3730.. option:: -mbulk-memory, -mno-bulk-memory 3731 3732.. option:: -mexception-handling, -mno-exception-handling 3733 3734.. option:: -mextended-const, -mno-extended-const 3735 3736.. option:: -mmultivalue, -mno-multivalue 3737 3738.. option:: -mmutable-globals, -mno-mutable-globals 3739 3740.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 3741 3742.. option:: -mreference-types, -mno-reference-types 3743 3744.. option:: -mrelaxed-simd, -mno-relaxed-simd 3745 3746.. option:: -msign-ext, -mno-sign-ext 3747 3748.. option:: -msimd128, -mno-simd128 3749 3750.. option:: -mtail-call, -mno-tail-call 3751 3752WebAssembly Driver 3753------------------ 3754.. option:: -mexec-model=<arg> 3755 3756Execution model (WebAssembly only). <arg> must be 'command' or 'reactor'. 3757 3758X86 3759--- 3760.. option:: -m3dnow, -mno-3dnow 3761 3762.. option:: -m3dnowa, -mno-3dnowa 3763 3764.. option:: -madx, -mno-adx 3765 3766.. option:: -maes, -mno-aes 3767 3768.. option:: -mamx-bf16, -mno-amx-bf16 3769 3770.. option:: -mamx-int8, -mno-amx-int8 3771 3772.. option:: -mamx-tile, -mno-amx-tile 3773 3774.. option:: -mavx, -mno-avx 3775 3776.. option:: -mavx2, -mno-avx2 3777 3778.. option:: -mavx512bf16, -mno-avx512bf16 3779 3780.. option:: -mavx512bitalg, -mno-avx512bitalg 3781 3782.. option:: -mavx512bw, -mno-avx512bw 3783 3784.. option:: -mavx512cd, -mno-avx512cd 3785 3786.. option:: -mavx512dq, -mno-avx512dq 3787 3788.. option:: -mavx512er, -mno-avx512er 3789 3790.. option:: -mavx512f, -mno-avx512f 3791 3792.. option:: -mavx512fp16, -mno-avx512fp16 3793 3794.. option:: -mavx512ifma, -mno-avx512ifma 3795 3796.. option:: -mavx512pf, -mno-avx512pf 3797 3798.. option:: -mavx512vbmi, -mno-avx512vbmi 3799 3800.. option:: -mavx512vbmi2, -mno-avx512vbmi2 3801 3802.. option:: -mavx512vl, -mno-avx512vl 3803 3804.. option:: -mavx512vnni, -mno-avx512vnni 3805 3806.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 3807 3808.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 3809 3810.. option:: -mavxvnni, -mno-avxvnni 3811 3812.. option:: -mbmi, -mno-bmi 3813 3814.. option:: -mbmi2, -mno-bmi2 3815 3816.. option:: -mcldemote, -mno-cldemote 3817 3818.. option:: -mclflushopt, -mno-clflushopt 3819 3820.. option:: -mclwb, -mno-clwb 3821 3822.. option:: -mclzero, -mno-clzero 3823 3824.. option:: -mcrc32, -mno-crc32 3825 3826.. option:: -mcx16, -mno-cx16 3827 3828.. option:: -menqcmd, -mno-enqcmd 3829 3830.. option:: -mf16c, -mno-f16c 3831 3832.. option:: -mfma, -mno-fma 3833 3834.. option:: -mfma4, -mno-fma4 3835 3836.. option:: -mfsgsbase, -mno-fsgsbase 3837 3838.. option:: -mfxsr, -mno-fxsr 3839 3840.. option:: -mgfni, -mno-gfni 3841 3842.. option:: -mhreset, -mno-hreset 3843 3844.. option:: -minvpcid, -mno-invpcid 3845 3846.. option:: -mkl, -mno-kl 3847 3848.. option:: -mlwp, -mno-lwp 3849 3850.. option:: -mlzcnt, -mno-lzcnt 3851 3852.. option:: -mmmx, -mno-mmx 3853 3854.. option:: -mmovbe, -mno-movbe 3855 3856.. option:: -mmovdir64b, -mno-movdir64b 3857 3858.. option:: -mmovdiri, -mno-movdiri 3859 3860.. option:: -mmwaitx, -mno-mwaitx 3861 3862.. option:: -mpclmul, -mno-pclmul 3863 3864.. option:: -mpconfig, -mno-pconfig 3865 3866.. option:: -mpku, -mno-pku 3867 3868.. option:: -mpopcnt, -mno-popcnt 3869 3870.. option:: -mprefetchwt1, -mno-prefetchwt1 3871 3872.. option:: -mprfchw, -mno-prfchw 3873 3874.. option:: -mptwrite, -mno-ptwrite 3875 3876.. option:: -mrdpid, -mno-rdpid 3877 3878.. option:: -mrdrnd, -mno-rdrnd 3879 3880.. option:: -mrdseed, -mno-rdseed 3881 3882.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 3883 3884.. option:: -mrtm, -mno-rtm 3885 3886.. option:: -msahf, -mno-sahf 3887 3888.. option:: -mserialize, -mno-serialize 3889 3890.. option:: -msgx, -mno-sgx 3891 3892.. option:: -msha, -mno-sha 3893 3894.. option:: -mshstk, -mno-shstk 3895 3896.. option:: -msse, -mno-sse 3897 3898.. option:: -msse2, -mno-sse2 3899 3900.. option:: -msse3, -mno-sse3 3901 3902.. option:: -msse4.1, -mno-sse4.1 3903 3904.. program:: clang1 3905.. option:: -msse4.2, -mno-sse4.2, -msse4 3906.. program:: clang 3907 3908.. option:: -msse4a, -mno-sse4a 3909 3910.. option:: -mssse3, -mno-ssse3 3911 3912.. option:: -mtbm, -mno-tbm 3913 3914.. option:: -mtsxldtrk, -mno-tsxldtrk 3915 3916.. option:: -muintr, -mno-uintr 3917 3918.. option:: -mvaes, -mno-vaes 3919 3920.. option:: -mvpclmulqdq, -mno-vpclmulqdq 3921 3922.. option:: -mvzeroupper, -mno-vzeroupper 3923 3924.. option:: -mwaitpkg, -mno-waitpkg 3925 3926.. option:: -mwbnoinvd, -mno-wbnoinvd 3927 3928.. option:: -mwidekl, -mno-widekl 3929 3930.. option:: -mx87, -m80387, -mno-x87 3931 3932.. option:: -mxop, -mno-xop 3933 3934.. option:: -mxsave, -mno-xsave 3935 3936.. option:: -mxsavec, -mno-xsavec 3937 3938.. option:: -mxsaveopt, -mno-xsaveopt 3939 3940.. option:: -mxsaves, -mno-xsaves 3941 3942RISCV 3943----- 3944.. option:: -msave-restore, -mno-save-restore 3945 3946Enable using library calls for save and restore 3947 3948Long double flags 3949----------------- 3950Selects the long double implementation 3951 3952.. option:: -mlong-double-128 3953 3954Force long double to be 128 bits 3955 3956.. option:: -mlong-double-64 3957 3958Force long double to be 64 bits 3959 3960.. option:: -mlong-double-80 3961 3962Force long double to be 80 bits, padded to 128 bits for storage 3963 3964Optimization level 3965~~~~~~~~~~~~~~~~~~ 3966 3967Flags controlling how much optimization should be performed. 3968 3969.. option:: -O<arg>, -O (equivalent to -O1), --optimize, --optimize=<arg> 3970 3971.. option:: -Ofast<arg> 3972 3973Debug information generation 3974~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3975 3976Flags controlling how much and what kind of debug information should be 3977generated. 3978 3979Kind and level of debug information 3980----------------------------------- 3981.. option:: -g, --debug, --debug=<arg> 3982 3983Generate source-level debug information 3984 3985.. option:: -gdwarf 3986 3987Generate source-level debug information with the default dwarf version 3988 3989.. option:: -gdwarf-2 3990 3991Generate source-level debug information with dwarf version 2 3992 3993.. option:: -gdwarf-3 3994 3995Generate source-level debug information with dwarf version 3 3996 3997.. option:: -gdwarf-4 3998 3999Generate source-level debug information with dwarf version 4 4000 4001.. option:: -gdwarf-5 4002 4003Generate source-level debug information with dwarf version 5 4004 4005.. option:: -gdwarf32 4006 4007Enables DWARF32 format for ELF binaries, if debug information emission is enabled. 4008 4009.. option:: -gdwarf64 4010 4011Enables DWARF64 format for ELF binaries, if debug information emission is enabled. 4012 4013.. option:: -gfull 4014 4015.. option:: -ginline-line-tables, -gno-inline-line-tables 4016 4017.. option:: -gused 4018 4019Debug level 4020___________ 4021.. option:: -g0 4022 4023.. option:: -g2 4024 4025.. option:: -g3 4026 4027.. option:: -ggdb0 4028 4029.. option:: -ggdb1 4030 4031.. option:: -ggdb2 4032 4033.. option:: -ggdb3 4034 4035.. option:: -gline-directives-only 4036 4037Emit debug line info directives only 4038 4039.. option:: -gline-tables-only, -g1, -gmlt 4040 4041Emit debug line number tables only 4042 4043.. option:: -gmodules 4044 4045Generate debug info with external references to clang modules or precompiled headers 4046 4047Debugger to tune debug information for 4048______________________________________ 4049.. option:: -gdbx 4050 4051.. option:: -ggdb 4052 4053.. option:: -glldb 4054 4055.. option:: -gsce 4056 4057Debug information flags 4058----------------------- 4059.. option:: -gcolumn-info, -gno-column-info 4060 4061.. option:: -gdwarf-aranges 4062 4063.. option:: -gembed-source, -gno-embed-source 4064 4065Embed source text in DWARF debug sections 4066 4067.. option:: -ggnu-pubnames, -gno-gnu-pubnames 4068 4069.. option:: -gpubnames, -gno-pubnames 4070 4071.. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches 4072 4073.. option:: -gsimple-template-names, -gno-simple-template-names 4074 4075.. option:: -gsplit-dwarf, -gno-split-dwarf 4076 4077.. program:: clang1 4078.. option:: -gsplit-dwarf=<arg> 4079.. program:: clang 4080 4081Set DWARF fission mode. <arg> must be 'split' or 'single'. 4082 4083.. option:: -gstrict-dwarf, -gno-strict-dwarf 4084 4085.. option:: -gz=<arg>, -gz (equivalent to -gz=zlib) 4086 4087DWARF debug sections compression type 4088 4089Static analyzer flags 4090===================== 4091 4092Flags controlling the behavior of the Clang Static Analyzer. 4093 4094.. option:: -Xanalyzer <arg> 4095 4096Pass <arg> to the static analyzer 4097 4098Fortran compilation flags 4099========================= 4100 4101Flags that will be passed onto the ``gfortran`` compiler when Clang is given 4102a Fortran input. 4103 4104.. option:: -A<arg>, --assert <arg>, --assert=<arg> 4105 4106.. option:: -A-<arg> 4107 4108.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 4109 4110.. option:: -falign-commons, -fno-align-commons 4111 4112.. option:: -fall-intrinsics, -fno-all-intrinsics 4113 4114.. option:: -fbacktrace, -fno-backtrace 4115 4116.. option:: -fblas-matmul-limit=<arg> 4117 4118.. option:: -fbounds-check, -fno-bounds-check 4119 4120.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 4121 4122.. option:: -fcheck=<arg> 4123 4124.. option:: -fcoarray=<arg> 4125 4126.. option:: -fconvert=<arg> 4127 4128.. option:: -fcray-pointer, -fno-cray-pointer 4129 4130.. option:: -fd-lines-as-code, -fno-d-lines-as-code 4131 4132.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 4133 4134.. option:: -fdollar-ok, -fno-dollar-ok 4135 4136.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 4137 4138.. option:: -fdump-fortran-original, -fno-dump-fortran-original 4139 4140.. option:: -fdump-parse-tree, -fno-dump-parse-tree 4141 4142.. option:: -fexternal-blas, -fno-external-blas 4143 4144.. option:: -ff2c, -fno-f2c 4145 4146.. option:: -ffpe-trap=<arg> 4147 4148.. option:: -ffree-line-length-<arg> 4149 4150.. option:: -ffrontend-optimize, -fno-frontend-optimize 4151 4152.. option:: -finit-character=<arg> 4153 4154.. option:: -finit-integer=<arg> 4155 4156.. option:: -finit-local-zero, -fno-init-local-zero 4157 4158.. option:: -finit-logical=<arg> 4159 4160.. option:: -finit-real=<arg> 4161 4162.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 4163 4164.. option:: -fmax-array-constructor=<arg> 4165 4166.. option:: -fmax-errors=<arg> 4167 4168.. option:: -fmax-identifier-length, -fno-max-identifier-length 4169 4170.. option:: -fmax-stack-var-size=<arg> 4171 4172.. option:: -fmax-subrecord-length=<arg> 4173 4174.. option:: -fmodule-private, -fno-module-private 4175 4176.. option:: -fpack-derived, -fno-pack-derived 4177 4178.. option:: -frange-check, -fno-range-check 4179 4180.. option:: -freal-4-real-10, -fno-real-4-real-10 4181 4182.. option:: -freal-4-real-16, -fno-real-4-real-16 4183 4184.. option:: -freal-4-real-8, -fno-real-4-real-8 4185 4186.. option:: -freal-8-real-10, -fno-real-8-real-10 4187 4188.. option:: -freal-8-real-16, -fno-real-8-real-16 4189 4190.. option:: -freal-8-real-4, -fno-real-8-real-4 4191 4192.. option:: -frealloc-lhs, -fno-realloc-lhs 4193 4194.. option:: -frecord-marker=<arg> 4195 4196.. option:: -frecursive, -fno-recursive 4197 4198.. option:: -frepack-arrays, -fno-repack-arrays 4199 4200.. option:: -fsecond-underscore, -fno-second-underscore 4201 4202.. option:: -fsign-zero, -fno-sign-zero 4203 4204.. option:: -fstack-arrays, -fno-stack-arrays 4205 4206.. option:: -funderscoring, -fno-underscoring 4207 4208.. option:: -fwhole-file, -fno-whole-file 4209 4210.. option:: -imultilib <arg> 4211 4212.. option:: -static-libgfortran 4213 4214Linker flags 4215============ 4216Flags that are passed on to the linker 4217 4218.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 4219 4220Add directory to library search path 4221 4222.. option:: -Mach 4223 4224.. option:: -T<script> 4225 4226Specify <script> as linker script 4227 4228.. option:: -Tbss<addr> 4229 4230Set starting address of BSS to <addr> 4231 4232.. option:: -Tdata<addr> 4233 4234Set starting address of DATA to <addr> 4235 4236.. option:: -Ttext<addr> 4237 4238Set starting address of TEXT to <addr> 4239 4240.. option:: -Wl,<arg>,<arg2>... 4241 4242Pass the comma separated arguments in <arg> to the linker 4243 4244.. option:: -X 4245 4246.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 4247 4248Pass <arg> to the linker 4249 4250.. option:: -Xoffload-linker<triple> <arg> 4251 4252Pass <arg> to the offload linkers or the ones idenfied by -<triple> 4253 4254.. program:: clang1 4255.. option:: -Z 4256.. program:: clang 4257 4258.. option:: -b<arg> 4259 4260Pass -b <arg> to the linker on AIX (only). 4261 4262.. option:: -coverage, --coverage 4263 4264.. option:: -e<arg>, --entry 4265 4266.. option:: -filelist <arg> 4267 4268.. option:: --hip-device-lib=<arg> 4269 4270HIP device library 4271 4272.. option:: --hipspv-pass-plugin=<dsopath> 4273 4274path to a pass plugin for HIP to SPIR-V passes. 4275 4276.. option:: -l<arg> 4277 4278.. option:: --ld-path=<arg> 4279 4280.. option:: -nostartfiles 4281 4282.. program:: clang1 4283.. option:: -nostdlib, --no-standard-libraries 4284.. program:: clang 4285 4286.. option:: --offload-link 4287 4288Use the new offloading linker to perform the link job. 4289 4290.. option:: -pie 4291 4292.. option:: -r 4293 4294.. option:: -rdynamic 4295 4296.. option:: --rocm-device-lib-path=<arg>, --hip-device-lib-path=<arg> 4297 4298ROCm device library path. Alternative to rocm-path. 4299 4300.. option:: -rpath <arg> 4301 4302.. option:: -s 4303 4304.. option:: -shared, --shared 4305 4306.. option:: -specs=<arg>, --specs=<arg> 4307 4308.. option:: -static, --static 4309 4310.. option:: -static-pie 4311 4312.. option:: -t 4313 4314.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 4315 4316.. option:: -undef 4317 4318undef all system defines 4319 4320.. option:: -undefined<arg>, --no-undefined 4321 4322.. option:: -z <arg> 4323 4324Pass -z <arg> to the linker 4325 4326<clang-dxc options> 4327=================== 4328dxc compatibility options 4329 4330.. program:: clang3 4331.. option:: /T<profile>, -T<profile> 4332.. program:: clang 4333 4334Set 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'. 4335 4336.. program:: clang4 4337.. option:: /emit-pristine-llvm, -emit-pristine-llvm, /fcgl, -fcgl 4338.. program:: clang 4339 4340Emit pristine LLVM IR from the frontend by not running any LLVM passes at all.Same as -S + -emit-llvm + -disable-llvm-passes. 4341 4342.. program:: clang5 4343.. option:: /hlsl-no-stdinc, -hlsl-no-stdinc 4344.. program:: clang 4345 4346HLSL only. Disables all standard includes containing non-native compiler types and functions. 4347 4348