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