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<dir>, --prefix <arg>, --prefix=<arg> 22 23Add <dir> to search path for binaries and object files used implicitly 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\|text). 106 107.. option:: -ansi, --ansi 108 109.. option:: -arch <arg> 110 111.. program:: clang1 112.. option:: -arch\_errors\_fatal 113.. program:: clang 114 115.. program:: clang2 116.. option:: -arch\_only <arg> 117.. program:: clang 118 119.. option:: -arcmt-migrate-emit-errors 120 121Emit ARC errors even if the migrator can fix them 122 123.. option:: -arcmt-migrate-report-output <arg> 124 125Output path for the plist report 126 127.. option:: --autocomplete=<arg> 128 129.. option:: -bind\_at\_load 130 131.. option:: -bundle 132 133.. program:: clang1 134.. option:: -bundle\_loader <arg> 135.. program:: clang 136 137.. option:: -client\_name<arg> 138 139.. option:: -compatibility\_version<arg> 140 141.. option:: --config <arg> 142 143Specifies configuration file 144 145.. option:: --constant-cfstrings 146 147.. option:: -coverage, --coverage 148 149.. option:: --cuda-compile-host-device 150 151Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 152 153.. option:: --cuda-device-only 154 155Compile CUDA code for device only 156 157.. option:: --cuda-host-only 158 159Compile CUDA code for host only. Has no effect on non-CUDA compilations. 160 161.. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> 162 163Include PTX for the following GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. 164 165.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 166 167Enable device-side debug info generation. Disables ptxas optimizations. 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:: -dumpmachine 182 183.. option:: -dumpversion 184 185.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 186 187.. option:: -dylib\_file <arg> 188 189.. option:: -dylinker 190 191.. program:: clang1 192.. option:: -dylinker\_install\_name<arg> 193.. program:: clang 194 195.. option:: -dynamic 196 197.. option:: -dynamiclib 198 199.. option:: -emit-ast 200 201Emit Clang AST files for source inputs 202 203.. option:: -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 204 205Trivial 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 206 207.. option:: -exported\_symbols\_list <arg> 208 209.. option:: -faligned-new=<arg> 210 211.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero 212 213Flush denormal floating point values to zero in CUDA device mode. 214 215.. option:: -ffixed-r19 216 217Reserve register r19 (Hexagon only) 218 219.. option:: -fheinous-gnu-extensions 220 221.. option:: -flat\_namespace 222 223.. option:: -fopenmp-targets=<arg1>,<arg2>... 224 225Specify comma-separated list of triples OpenMP offloading targets to be supported 226 227.. option:: -force\_cpusubtype\_ALL 228 229.. program:: clang1 230.. option:: -force\_flat\_namespace 231.. program:: clang 232 233.. program:: clang2 234.. option:: -force\_load <arg> 235.. program:: clang 236 237.. option:: -framework <arg> 238 239.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 240 241Add -rpath with architecture-specific resource directory to the linker flags 242 243.. option:: -fsanitize-system-blacklist=<arg> 244 245Path to system blacklist file for sanitizers 246 247.. option:: -fsystem-module 248 249Build this module as a system module. Only used with -emit-module 250 251.. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> 252 253Use the gcc toolchain at the given directory 254 255.. option:: -gcodeview 256 257Generate CodeView debug information 258 259.. option:: -gcodeview-ghash, -gno-codeview-ghash 260 261Emit type record hashes in a .debug$H section 262 263.. option:: -ginline-line-tables, -gno-inline-line-tables 264 265.. option:: --gpu-max-threads-per-block=<arg> 266 267Default max threads per block for kernel launch bounds for HIP 268 269.. option:: -headerpad\_max\_install\_names<arg> 270 271.. option:: -help, --help 272 273Display available options 274 275.. option:: --help-hidden 276 277Display help for hidden options 278 279.. option:: --hip-link 280 281Link clang-offload-bundler bundles for HIP 282 283.. option:: -ibuiltininc 284 285Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it 286 287.. option:: -image\_base <arg> 288 289.. option:: -index-header-map 290 291Make the next included directory (-I or -F) an indexer header map 292 293.. option:: -init <arg> 294 295.. option:: -install\_name <arg> 296 297.. option:: -interface-stub-version=<arg> 298 299.. option:: -keep\_private\_externs 300 301.. option:: -lazy\_framework <arg> 302 303.. program:: clang1 304.. option:: -lazy\_library <arg> 305.. program:: clang 306 307.. option:: -mbig-endian, -EB 308 309.. option:: -mbranch-protection=<arg> 310 311Enforce targets of indirect branches and function returns 312 313.. option:: --migrate 314 315Run the migrator 316 317.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 318 319.. option:: -mlinker-version=<arg> 320 321.. option:: -mlittle-endian, -EL 322 323.. option:: -mllvm <arg> 324 325Additional arguments to forward to LLVM's option processing 326 327.. option:: -module-dependency-dir <arg> 328 329Directory to dump module dependencies to 330 331.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 332 333.. option:: -multi\_module 334 335.. option:: -multiply\_defined <arg> 336 337.. program:: clang1 338.. option:: -multiply\_defined\_unused <arg> 339.. program:: clang 340 341.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 342 343.. option:: --no-cuda-version-check 344 345Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 346 347.. option:: -no-integrated-cpp, --no-integrated-cpp 348 349.. option:: -no\_dead\_strip\_inits\_and\_terms 350 351.. option:: -nobuiltininc 352 353Disable builtin #include directories 354 355.. option:: -nodefaultlibs 356 357.. option:: -nofixprebinding 358 359.. option:: -nogpuinc, -nocudainc 360 361.. option:: -nogpulib, -nocudalib 362 363Do not link device library for CUDA/HIP device compilation 364 365.. option:: -nolibc 366 367.. option:: -nomultidefs 368 369.. option:: -nopie, -no-pie 370 371.. option:: -noprebind 372 373.. option:: -noprofilelib 374 375.. option:: -noseglinkedit 376 377.. option:: -nostartfiles 378 379.. option:: -nostdinc, --no-standard-includes 380 381.. program:: clang1 382.. option:: -nostdinc++ 383.. program:: clang 384 385Disable standard #include directories for the C++ standard library 386 387.. option:: -nostdlib, --no-standard-libraries 388 389.. program:: clang1 390.. option:: -nostdlib++ 391.. program:: clang 392 393.. option:: -nostdlibinc 394 395.. option:: -o<file>, --output <arg>, --output=<arg> 396 397Write output to <file> 398 399.. option:: -objcmt-atomic-property 400 401Make migration to 'atomic' properties 402 403.. option:: -objcmt-migrate-all 404 405Enable migration to modern ObjC 406 407.. option:: -objcmt-migrate-annotation 408 409Enable migration to property and method annotations 410 411.. option:: -objcmt-migrate-designated-init 412 413Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 414 415.. option:: -objcmt-migrate-instancetype 416 417Enable migration to infer instancetype for method result type 418 419.. option:: -objcmt-migrate-literals 420 421Enable migration to modern ObjC literals 422 423.. option:: -objcmt-migrate-ns-macros 424 425Enable migration to NS\_ENUM/NS\_OPTIONS macros 426 427.. option:: -objcmt-migrate-property 428 429Enable migration to modern ObjC property 430 431.. option:: -objcmt-migrate-property-dot-syntax 432 433Enable migration of setter/getter messages to property-dot syntax 434 435.. option:: -objcmt-migrate-protocol-conformance 436 437Enable migration to add protocol conformance on classes 438 439.. option:: -objcmt-migrate-readonly-property 440 441Enable migration to modern ObjC readonly property 442 443.. option:: -objcmt-migrate-readwrite-property 444 445Enable migration to modern ObjC readwrite property 446 447.. option:: -objcmt-migrate-subscripting 448 449Enable migration to modern ObjC subscripting 450 451.. option:: -objcmt-ns-nonatomic-iosonly 452 453Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 454 455.. option:: -objcmt-returns-innerpointer-property 456 457Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 458 459.. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> 460 461Only modify files with a filename contained in the provided directory path 462 463.. option:: -object 464 465.. option:: --offload-arch=<arg>, --cuda-gpu-arch=<arg>, --no-offload-arch=<arg> 466 467CUDA/HIP offloading device architecture (e.g. sm\_35, gfx906). May be specified more than once. 468 469.. option:: -p, --profile 470 471.. option:: -pagezero\_size<arg> 472 473.. option:: -pg 474 475Enable mcount instrumentation 476 477.. option:: -pie 478 479.. option:: -pipe, --pipe 480 481Use pipes between commands, when possible 482 483.. option:: -prebind 484 485.. program:: clang1 486.. option:: -prebind\_all\_twolevel\_modules 487.. program:: clang 488 489.. option:: -preload 490 491.. option:: --print-diagnostic-categories 492 493.. option:: -print-effective-triple, --print-effective-triple 494 495Print the effective target triple 496 497.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 498 499Print the full library path of <file> 500 501.. option:: -print-ivar-layout 502 503Enable Objective-C Ivar layout bitmap print trace 504 505.. option:: -print-libgcc-file-name, --print-libgcc-file-name 506 507Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 508 509.. option:: -print-multi-directory, --print-multi-directory 510 511.. option:: -print-multi-lib, --print-multi-lib 512 513.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 514 515Print the full program path of <name> 516 517.. option:: -print-resource-dir, --print-resource-dir 518 519Print the resource directory pathname 520 521.. option:: -print-search-dirs, --print-search-dirs 522 523Print the paths used for finding libraries and programs 524 525.. option:: -print-target-triple, --print-target-triple 526 527Print the normalized target triple 528 529.. option:: -print-targets, --print-targets 530 531Print the registered targets 532 533.. option:: -private\_bundle 534 535.. option:: -pthread, -no-pthread 536 537Support POSIX threads in generated code 538 539.. option:: -pthreads 540 541.. option:: -rdynamic 542 543.. option:: -read\_only\_relocs <arg> 544 545.. option:: -relocatable-pch, --relocatable-pch 546 547Whether to build a relocatable precompiled header 548 549.. option:: -remap 550 551.. option:: -rewrite-legacy-objc 552 553Rewrite Legacy Objective-C source to C++ 554 555.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 556 557Compiler runtime library to use 558 559.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 560 561Save llvm statistics. 562 563.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 564 565Save intermediate compilation results. 566 567.. option:: -sectalign <arg1> <arg2> <arg3> 568 569.. option:: -sectcreate <arg1> <arg2> <arg3> 570 571.. option:: -sectobjectsymbols <arg1> <arg2> 572 573.. option:: -sectorder <arg1> <arg2> <arg3> 574 575.. option:: -seg1addr<arg> 576 577.. option:: -seg\_addr\_table <arg> 578 579.. program:: clang1 580.. option:: -seg\_addr\_table\_filename <arg> 581.. program:: clang 582 583.. option:: -segaddr <arg1> <arg2> 584 585.. option:: -segcreate <arg1> <arg2> <arg3> 586 587.. option:: -seglinkedit 588 589.. option:: -segprot <arg1> <arg2> <arg3> 590 591.. option:: -segs\_read\_<arg> 592 593.. program:: clang1 594.. option:: -segs\_read\_only\_addr <arg> 595.. program:: clang 596 597.. program:: clang2 598.. option:: -segs\_read\_write\_addr <arg> 599.. program:: clang 600 601.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 602 603Serialize compiler diagnostics to a file 604 605.. option:: -shared, --shared 606 607.. option:: -shared-libgcc 608 609.. option:: -shared-libsan, -shared-libasan 610 611Dynamically link the sanitizer runtime 612 613.. option:: -single\_module 614 615.. option:: -specs=<arg>, --specs=<arg> 616 617.. option:: -static, --static 618 619.. option:: -static-libgcc 620 621.. option:: -static-libsan 622 623Statically link the sanitizer runtime 624 625.. option:: -static-libstdc++ 626 627.. option:: -static-openmp 628 629Use the static host OpenMP runtime while linking. 630 631.. option:: -static-pie 632 633.. option:: -std-default=<arg> 634 635.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 636 637C++ standard library to use 638 639.. option:: -sub\_library<arg> 640 641.. program:: clang1 642.. option:: -sub\_umbrella<arg> 643.. program:: clang 644 645.. option:: --sysroot=<arg>, --sysroot <arg> 646 647.. option:: --target-help 648 649.. option:: --target=<arg>, -target <arg> 650 651Generate code for the given target 652 653.. option:: -time 654 655Time individual commands 656 657.. option:: -traditional, --traditional 658 659.. option:: -traditional-cpp, --traditional-cpp 660 661Enable some traditional CPP emulation 662 663.. option:: -twolevel\_namespace 664 665.. program:: clang1 666.. option:: -twolevel\_namespace\_hints 667.. program:: clang 668 669.. option:: -umbrella <arg> 670 671.. option:: -unexported\_symbols\_list <arg> 672 673.. option:: -unwindlib=<arg>, --unwindlib=<arg> 674 675Unwind library to use 676 677.. option:: -v, --verbose 678 679Show commands to run and use verbose output 680 681.. option:: --verify-debug-info 682 683Verify the binary representation of debug output 684 685.. option:: --version 686 687Print version information 688 689.. option:: -w, --no-warnings 690 691Suppress all warnings 692 693.. option:: -weak-l<arg> 694 695.. option:: -weak\_framework <arg> 696 697.. program:: clang1 698.. option:: -weak\_library <arg> 699.. program:: clang 700 701.. program:: clang2 702.. option:: -weak\_reference\_mismatches <arg> 703.. program:: clang 704 705.. option:: -whatsloaded 706 707.. option:: -whyload 708 709.. option:: -working-directory<arg>, -working-directory=<arg> 710 711Resolve file paths relative to the specified directory 712 713.. option:: -x<language>, --language <arg>, --language=<arg> 714 715Treat subsequent input files as having type <language> 716 717.. option:: -y<arg> 718 719Actions 720======= 721The action to perform on the input. 722 723.. option:: -E, --preprocess 724 725Only run the preprocessor 726 727.. option:: -S, --assemble 728 729Only run preprocess and compilation steps 730 731.. option:: -c, --compile 732 733Only run preprocess, compile, and assemble steps 734 735.. option:: -emit-interface-stubs 736 737Generate Inteface Stub Files. 738 739.. option:: -emit-llvm 740 741Use the LLVM representation for assembler and object files 742 743.. option:: -emit-merged-ifs 744 745Generate Interface Stub Files, emit merged text not binary. 746 747.. option:: -fsyntax-only 748 749.. option:: -module-file-info 750 751Provide information about a particular module file 752 753.. option:: --precompile 754 755Only precompile the input 756 757.. option:: -rewrite-objc 758 759Rewrite Objective-C source to C++ 760 761.. option:: -verify-pch 762 763Load and verify that a pre-compiled header file is not stale 764 765Compilation flags 766================= 767 768Flags controlling the behavior of Clang during compilation. These flags have 769no effect during actions that do not perform compilation. 770 771.. option:: -Xassembler <arg> 772 773Pass <arg> to the assembler 774 775.. option:: -Xclang <arg> 776 777Pass <arg> to the clang compiler 778 779.. option:: -fclang-abi-compat=<version> 780 781Attempt to match the ABI of Clang <version> 782 783.. option:: -fcomment-block-commands=<arg>,<arg2>... 784 785Treat each comma separated argument in <arg> as a documentation comment block command 786 787.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 788 789Require member pointer base types to be complete if they would be significant under the Microsoft ABI 790 791.. option:: -fcrash-diagnostics-dir=<arg> 792 793.. option:: -fdeclspec, -fno-declspec 794 795Allow \_\_declspec as a keyword 796 797.. option:: -fdepfile-entry=<arg> 798 799.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 800 801.. option:: -fdiagnostics-format=<arg> 802 803.. option:: -fdiagnostics-parseable-fixits 804 805Print fix-its in machine parseable form 806 807.. option:: -fdiagnostics-print-source-range-info 808 809Print source range spans in numeric form 810 811.. option:: -fdiagnostics-show-category=<arg> 812 813.. option:: -fdiscard-value-names, -fno-discard-value-names 814 815Discard value names in LLVM IR 816 817.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 818 819Enables an experimental new pass manager in LLVM. 820 821.. option:: -fexperimental-strict-floating-point 822 823Enables the use of non-default rounding modes and non-default exception handling on targets that are not currently ready. 824 825.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 826 827Use separate accesses for consecutive bitfield runs with legal widths and alignments. 828 829.. option:: -fglobal-isel, -fexperimental-isel, -fno-global-isel 830 831Enables the global instruction selector 832 833.. option:: -finline-functions, -fno-inline-functions 834 835Inline suitable functions 836 837.. option:: -finline-hint-functions 838 839Inline functions which are (explicitly or implicitly) marked inline 840 841.. option:: -fno-crash-diagnostics 842 843Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 844 845.. option:: -fno-sanitize-blacklist 846 847Don't use blacklist file for sanitizers 848 849.. option:: -fparse-all-comments 850 851.. option:: -frecord-command-line, -fno-record-command-line, -frecord-gcc-switches 852 853.. option:: -fsanitize-address-field-padding=<arg> 854 855Level of field padding for AddressSanitizer 856 857.. option:: -fsanitize-address-globals-dead-stripping 858 859Enable linker dead stripping of globals in AddressSanitizer 860 861.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 862 863Enable poisoning array cookies when using custom operator new\[\] in AddressSanitizer 864 865.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 866 867Enable use-after-scope detection in AddressSanitizer 868 869.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 870 871Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 872 873.. option:: -fsanitize-blacklist=<arg> 874 875Path to blacklist file for sanitizers 876 877.. option:: -fsanitize-cfi-canonical-jump-tables, -fno-sanitize-cfi-canonical-jump-tables 878 879Make the jump table addresses canonical in the symbol table 880 881.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 882 883Enable control flow integrity (CFI) checks for cross-DSO calls. 884 885.. option:: -fsanitize-cfi-icall-generalize-pointers 886 887Generalize pointers in CFI indirect call type signature checks 888 889.. option:: -fsanitize-coverage-allowlist=<arg> 890 891Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones 892 893.. option:: -fsanitize-coverage-blocklist=<arg> 894 895Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones 896 897.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 898 899Specify the type of coverage instrumentation for Sanitizers 900 901.. option:: -fsanitize-hwaddress-abi=<arg> 902 903Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused. 904 905.. option:: -fsanitize-link-c++-runtime, -fno-sanitize-link-c++-runtime 906 907.. option:: -fsanitize-link-runtime, -fno-sanitize-link-runtime 908 909.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 910 911Enable origins tracking in MemorySanitizer 912 913.. program:: clang1 914.. option:: -fsanitize-memory-track-origins=<arg> 915.. program:: clang 916 917Enable origins tracking in MemorySanitizer 918 919.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 920 921Enable use-after-destroy detection in MemorySanitizer 922 923.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 924 925.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>..., -fsanitize-recover (equivalent to -fsanitize-recover=all) 926 927Enable recovery for specified sanitizers 928 929.. option:: -fsanitize-stats, -fno-sanitize-stats 930 931Enable sanitizer statistics gathering. 932 933.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 934 935Enable atomic operations instrumentation in ThreadSanitizer (default) 936 937.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 938 939Enable function entry/exit instrumentation in ThreadSanitizer (default) 940 941.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 942 943Enable memory access instrumentation in ThreadSanitizer (default) 944 945.. 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) 946 947Enable trapping for specified sanitizers 948 949.. option:: -fsanitize-undefined-strip-path-components=<number> 950 951Strip (or keep only, if negative) a given number of path components when emitting check metadata. 952 953.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 954 955Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 956 957.. option:: -moutline, -mno-outline 958 959Enable function outlining (AArch64 only) 960 961.. option:: --param <arg>, --param=<arg> 962 963.. option:: -print-supported-cpus, --print-supported-cpus, -mcpu=?, -mtune=? 964 965Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target) 966 967.. option:: -std=<arg>, --std=<arg>, --std <arg> 968 969Language standard to compile for 970 971Preprocessor flags 972~~~~~~~~~~~~~~~~~~ 973 974Flags controlling the behavior of the Clang preprocessor. 975 976.. option:: -C, --comments 977 978Include comments in preprocessed output 979 980.. option:: -CC, --comments-in-macros 981 982Include comments from within macros in preprocessed output 983 984.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 985 986Define <macro> to <value> (or 1 if <value> omitted) 987 988.. option:: -H, --trace-includes 989 990Show header includes and nesting depth 991 992.. option:: -P, --no-line-commands 993 994Disable linemarker output in -E mode 995 996.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 997 998Undefine macro <macro> 999 1000.. option:: -Wp,<arg>,<arg2>... 1001 1002Pass the comma separated arguments in <arg> to the preprocessor 1003 1004.. option:: -Xpreprocessor <arg> 1005 1006Pass <arg> to the preprocessor 1007 1008.. option:: -fmacro-prefix-map=<arg> 1009 1010remap file source paths in predefined preprocessor macros 1011 1012Include path management 1013----------------------- 1014 1015Flags controlling how ``#include``\s are resolved to files. 1016 1017.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 1018 1019Add directory to include search path. If there are multiple -I options, these directories are searched in the order they are given before the standard system directories are searched. If the same directory is in the SYSTEM include search paths, for example if also specified with -isystem, the -I option will be ignored 1020 1021.. option:: -I-, --include-barrier 1022 1023Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 1024 1025.. option:: --cuda-path-ignore-env 1026 1027Ignore environment variables to detect CUDA installation 1028 1029.. option:: --cuda-path=<arg> 1030 1031CUDA installation path 1032 1033.. option:: -cxx-isystem<directory> 1034 1035Add directory to the C++ SYSTEM include search path 1036 1037.. option:: -fbuild-session-file=<file> 1038 1039Use the last modification time of <file> as the build session timestamp 1040 1041.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 1042 1043Time when the current build session started 1044 1045.. option:: -fmodule-file=\[<name>=\]<file> 1046 1047Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 1048 1049.. option:: -fmodules-cache-path=<directory> 1050 1051Specify the module cache path 1052 1053.. option:: -fmodules-disable-diagnostic-validation 1054 1055Disable validation of the diagnostic options when loading the module 1056 1057.. option:: -fmodules-prune-after=<seconds> 1058 1059Specify the interval (in seconds) after which a module file will be considered unused 1060 1061.. option:: -fmodules-prune-interval=<seconds> 1062 1063Specify the interval (in seconds) between attempts to prune the module cache 1064 1065.. option:: -fmodules-user-build-path <directory> 1066 1067Specify the module user build path 1068 1069.. option:: -fmodules-validate-once-per-build-session 1070 1071Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 1072 1073.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 1074 1075Validate the system headers that a module depends on when loading the module 1076 1077.. option:: -fprebuilt-module-path=<directory> 1078 1079Specify the prebuilt module path 1080 1081.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1082 1083Add directory to AFTER include search path 1084 1085.. option:: -iframework<arg> 1086 1087Add directory to SYSTEM framework search path 1088 1089.. option:: -iframeworkwithsysroot<directory> 1090 1091Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1092 1093.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1094 1095Include macros from file before parsing 1096 1097.. option:: -include<file>, --include<file>, --include=<arg> 1098 1099Include file before parsing 1100 1101.. option:: -include-pch <file> 1102 1103Include precompiled header file 1104 1105.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1106 1107Set the -iwithprefix/-iwithprefixbefore prefix 1108 1109.. option:: -iquote<directory> 1110 1111Add directory to QUOTE include search path 1112 1113.. option:: -isysroot<dir> 1114 1115Set the system root directory (usually /) 1116 1117.. option:: -isystem<directory> 1118 1119Add directory to SYSTEM include search path 1120 1121.. option:: -isystem-after<directory> 1122 1123Add directory to end of the SYSTEM include search path 1124 1125.. option:: -ivfsoverlay<arg> 1126 1127Overlay the virtual filesystem described by file over the real file system 1128 1129.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1130 1131Set directory to SYSTEM include search path with prefix 1132 1133.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1134 1135Set directory to include search path with prefix 1136 1137.. option:: -iwithsysroot<directory> 1138 1139Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1140 1141.. option:: --libomptarget-nvptx-path=<arg> 1142 1143Path to libomptarget-nvptx libraries 1144 1145.. option:: --ptxas-path=<arg> 1146 1147Path to ptxas (used for compiling CUDA code) 1148 1149.. option:: --rocm-path=<arg> 1150 1151ROCm installation path, used for finding and automatically linking required bitcode libraries. 1152 1153.. program:: clang1 1154.. option:: -stdlib++-isystem<directory> 1155.. program:: clang 1156 1157Use directory as the C++ standard library include path 1158 1159.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1160 1161Treat all #include paths starting with <prefix> as including a system header. 1162 1163Dependency file generation 1164-------------------------- 1165 1166Flags controlling generation of a dependency file for ``make``-like build 1167systems. 1168 1169.. option:: -M, --dependencies 1170 1171Like -MD, but also implies -E and writes to stdout by default 1172 1173.. option:: -MD, --write-dependencies 1174 1175Write a depfile containing user and system headers 1176 1177.. option:: -MF<file> 1178 1179Write depfile output from -MMD, -MD, -MM, or -M to <file> 1180 1181.. option:: -MG, --print-missing-file-dependencies 1182 1183Add missing headers to depfile 1184 1185.. option:: -MJ<arg> 1186 1187Write a compilation database entry per input 1188 1189.. option:: -MM, --user-dependencies 1190 1191Like -MMD, but also implies -E and writes to stdout by default 1192 1193.. option:: -MMD, --write-user-dependencies 1194 1195Write a depfile containing user headers 1196 1197.. option:: -MP 1198 1199Create phony target for each dependency (other than main file) 1200 1201.. option:: -MQ<arg> 1202 1203Specify name of main file output to quote in depfile 1204 1205.. option:: -MT<arg> 1206 1207Specify name of main file output in depfile 1208 1209.. option:: -MV 1210 1211Use NMake/Jom format for the depfile 1212 1213Dumping preprocessor state 1214-------------------------- 1215 1216Flags allowing the state of the preprocessor to be dumped in various ways. 1217 1218.. option:: -d 1219 1220.. program:: clang1 1221.. option:: -d<arg> 1222.. program:: clang 1223 1224.. option:: -dD 1225 1226Print macro definitions in -E mode in addition to normal output 1227 1228.. option:: -dI 1229 1230Print include directives in -E mode in addition to normal output 1231 1232.. option:: -dM 1233 1234Print macro definitions in -E mode instead of normal output 1235 1236Diagnostic flags 1237~~~~~~~~~~~~~~~~ 1238 1239Flags controlling which warnings, errors, and remarks Clang will generate. 1240See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1241 1242.. option:: -R<remark> 1243 1244Enable the specified remark 1245 1246.. option:: -Rpass-analysis=<arg> 1247 1248Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1249 1250.. option:: -Rpass-missed=<arg> 1251 1252Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1253 1254.. option:: -Rpass=<arg> 1255 1256Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1257 1258.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1259 1260Enable the specified warning 1261 1262.. option:: -Wdeprecated, -Wno-deprecated 1263 1264Enable warnings for deprecated constructs and define \_\_DEPRECATED 1265 1266.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1267 1268Target-independent compilation options 1269~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1270.. option:: -Wframe-larger-than=<arg> 1271 1272.. option:: -fPIC, -fno-PIC 1273 1274.. option:: -fPIE, -fno-PIE 1275 1276.. option:: -faddrsig, -fno-addrsig 1277 1278Emit an address-significance table 1279 1280.. option:: -falign-functions, -fno-align-functions 1281 1282.. program:: clang1 1283.. option:: -falign-functions=<arg> 1284.. program:: clang 1285 1286.. program:: clang1 1287.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1288.. program:: clang 1289 1290Enable C++17 aligned allocation functions 1291 1292.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1293 1294Treat editor placeholders as valid source code 1295 1296.. option:: -fallow-unsupported 1297 1298.. option:: -faltivec, -fno-altivec 1299 1300.. option:: -fansi-escape-codes 1301 1302Use ANSI escape codes for diagnostics 1303 1304.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1305 1306Use Apple's kernel extensions ABI 1307 1308.. option:: -fapple-link-rtlib 1309 1310Force linking the clang builtins runtime library 1311 1312.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1313 1314Enable Apple gcc-compatible #pragma pack handling 1315 1316.. option:: -fapplication-extension, -fno-application-extension 1317 1318Restrict code to those available for App Extensions 1319 1320.. option:: -fasm, -fno-asm 1321 1322.. option:: -fasm-blocks, -fno-asm-blocks 1323 1324.. option:: -fassociative-math, -fno-associative-math 1325 1326.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1327 1328.. option:: -fast 1329 1330.. option:: -fastcp 1331 1332.. option:: -fastf 1333 1334.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1335 1336.. option:: -fautolink, -fno-autolink 1337 1338.. option:: -fbasic-block-sections=<arg> 1339 1340Generate labels for each basic block or place each basic block or a subset of basic blocks in its own section. 1341 1342.. option:: -fblocks, -fno-blocks 1343 1344Enable the 'blocks' language feature 1345 1346.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1347 1348.. option:: -fborland-extensions, -fno-borland-extensions 1349 1350Accept non-standard constructs supported by the Borland compiler 1351 1352.. option:: -fbracket-depth=<arg> 1353 1354.. option:: -fbuiltin, -fno-builtin 1355 1356.. option:: -fbuiltin-module-map 1357 1358Load the clang builtins module map file. 1359 1360.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1361 1362.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1363 1364.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1365 1366Instrument control-flow architecture protection. Options: return, branch, full, none. 1367 1368.. option:: -fcf-runtime-abi=<arg> 1369 1370.. option:: -fchar8\_t, -fno-char8\_t 1371 1372Enable C++ builtin type char8\_t 1373 1374.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1375 1376.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1377 1378Enable colors in diagnostics 1379 1380.. option:: -fcommon, -fno-common 1381 1382Place uninitialized global variables in a common block 1383 1384.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1385 1386.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1387 1388.. option:: -fconstant-string-class=<arg> 1389 1390.. option:: -fconstexpr-backtrace-limit=<arg> 1391 1392.. option:: -fconstexpr-depth=<arg> 1393 1394.. option:: -fconstexpr-steps=<arg> 1395 1396.. option:: -fconvergent-functions 1397 1398Assume functions may be convergent 1399 1400.. option:: -fcoroutines-ts, -fno-coroutines-ts 1401 1402Enable support for the C++ Coroutines TS 1403 1404.. option:: -fcoverage-mapping, -fno-coverage-mapping 1405 1406Generate coverage mapping to enable code coverage analysis 1407 1408.. option:: -fcreate-profile 1409 1410.. option:: -fcs-profile-generate 1411 1412Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1413 1414.. program:: clang1 1415.. option:: -fcs-profile-generate=<directory> 1416.. program:: clang 1417 1418Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1419 1420.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 1421 1422Use approximate transcendental functions 1423 1424.. option:: -fcuda-short-ptr, -fno-cuda-short-ptr 1425 1426Use 32-bit pointers for accessing const/local/shared address spaces 1427 1428.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1429 1430Enable C++ exceptions 1431 1432.. option:: -fcxx-modules, -fno-cxx-modules 1433 1434.. option:: -fdata-sections, -fno-data-sections 1435 1436Place each data in its own section 1437 1438.. option:: -fdebug-compilation-dir <arg>, -fdebug-compilation-dir=<arg> 1439 1440The compilation directory to embed in the debug info. 1441 1442.. option:: -fdebug-default-version=<arg> 1443 1444Default DWARF version to use, if a -g option caused DWARF debug info to be produced 1445 1446.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1447 1448Emit extra debug info to make sample profile more accurate 1449 1450.. option:: -fdebug-macro, -fno-debug-macro 1451 1452Emit macro debug information 1453 1454.. option:: -fdebug-pass-arguments 1455 1456.. option:: -fdebug-pass-structure 1457 1458.. option:: -fdebug-prefix-map=<arg> 1459 1460remap file source paths in debug info 1461 1462.. option:: -fdebug-ranges-base-address, -fno-debug-ranges-base-address 1463 1464Use DWARF base address selection entries in .debug\_ranges 1465 1466.. option:: -fdebug-types-section, -fno-debug-types-section 1467 1468Place debug types in their own section (ELF Only) 1469 1470.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1471 1472Parse templated function definitions at the end of the translation unit 1473 1474.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1475 1476Treat usage of null pointers as undefined behavior (default) 1477 1478.. option:: -fdenormal-fp-math=<arg> 1479 1480.. option:: -fdiagnostics-absolute-paths 1481 1482Print absolute paths in diagnostics 1483 1484.. option:: -fdiagnostics-color, -fno-diagnostics-color 1485 1486.. program:: clang1 1487.. option:: -fdiagnostics-color=<arg> 1488.. program:: clang 1489 1490.. option:: -fdiagnostics-hotness-threshold=<number> 1491 1492Prevent optimization remarks from being output if they do not have at least this profile count 1493 1494.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1495 1496Enable profile hotness information in diagnostic line 1497 1498.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1499 1500Display include stacks for diagnostic notes 1501 1502.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1503 1504Print option name with mappable diagnostics 1505 1506.. option:: -fdiagnostics-show-template-tree 1507 1508Print a template comparison tree for differing templates 1509 1510.. option:: -fdigraphs, -fno-digraphs 1511 1512Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1513 1514.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1515 1516Allow '$' in identifiers 1517 1518.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1519 1520Enable '\[\[\]\]' attributes in all C and C++ language modes 1521 1522.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1523 1524.. option:: -fdwarf-exceptions 1525 1526Use DWARF style exceptions 1527 1528.. option:: -felide-constructors, -fno-elide-constructors 1529 1530.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1531 1532.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1533 1534Embed LLVM bitcode (option: off, all, bitcode, marker) 1535 1536.. option:: -femit-all-decls 1537 1538Emit all declarations, even if unused 1539 1540.. option:: -femulated-tls, -fno-emulated-tls 1541 1542Use emutls functions to access thread\_local variables 1543 1544.. option:: -fenable-matrix 1545 1546Enable matrix data type and related builtin functions 1547 1548.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1549 1550.. option:: -ferror-limit=<arg> 1551 1552.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1553 1554.. option:: -fexceptions, -fno-exceptions 1555 1556Enable support for exception handling 1557 1558.. option:: -fexec-charset=<arg> 1559 1560.. option:: -fexperimental-new-constant-interpreter 1561 1562Enable the experimental new constant interpreter 1563 1564.. option:: -fexperimental-relative-c++-abi-vtables, -fno-experimental-relative-c++-abi-vtables 1565 1566Use the experimental C++ class ABI for classes with virtual tables 1567 1568.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1569 1570.. option:: -ffast-math, -fno-fast-math 1571 1572Allow aggressive, lossy floating-point optimizations 1573 1574.. option:: -ffile-prefix-map=<arg> 1575 1576remap file source paths in debug info and predefined preprocessor macros 1577 1578.. option:: -ffinite-math-only, -fno-finite-math-only 1579 1580.. option:: -ffixed-point, -fno-fixed-point 1581 1582Enable fixed point types 1583 1584.. option:: -ffor-scope, -fno-for-scope 1585 1586.. option:: -fforce-dwarf-frame, -fno-force-dwarf-frame 1587 1588Always emit a debug frame section 1589 1590.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1591 1592Emits more virtual tables to improve devirtualization 1593 1594.. option:: -fforce-enable-int128, -fno-force-enable-int128 1595 1596Enable support for int128\_t type 1597 1598.. option:: -ffp-contract=<arg> 1599 1600Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma) \| off (never fuse). Default is 'fast' for CUDA/HIP and 'on' otherwise. 1601 1602.. option:: -ffp-exception-behavior=<arg> 1603 1604Specifies the exception behavior of floating-point operations. 1605 1606.. option:: -ffp-model=<arg> 1607 1608Controls the semantics of floating-point calculations. 1609 1610.. option:: -ffreestanding 1611 1612Assert that the compilation takes place in a freestanding environment 1613 1614.. option:: -ffunction-sections, -fno-function-sections 1615 1616Place each function in its own section 1617 1618.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1619 1620.. option:: -fgnu-keywords, -fno-gnu-keywords 1621 1622Allow GNU-extension keywords regardless of language standard 1623 1624.. option:: -fgnu-runtime 1625 1626Generate output compatible with the standard GNU Objective-C runtime 1627 1628.. option:: -fgnu89-inline, -fno-gnu89-inline 1629 1630Use the gnu89 inline semantics 1631 1632.. option:: -fgnuc-version=<arg> 1633 1634Sets various macros to claim compatibility with the given GCC version (default is 4.2.1) 1635 1636.. option:: -fgpu-allow-device-init, -fno-gpu-allow-device-init 1637 1638Allow device side init function in HIP 1639 1640.. option:: -fgpu-rdc, -fcuda-rdc, -fno-gpu-rdc 1641 1642Generate relocatable device code, also known as separate compilation mode 1643 1644.. option:: -fhip-new-launch-api, -fno-hip-new-launch-api 1645 1646Use new kernel launching API for HIP 1647 1648.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1649 1650.. option:: -fhonor-nans, -fno-honor-nans 1651 1652.. option:: -fhosted 1653 1654.. option:: -fignore-exceptions 1655 1656Enable support for ignoring exception handling constructs 1657 1658.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1659 1660Implicitly search the file system for module map files. 1661 1662.. option:: -fimplicit-modules, -fno-implicit-modules 1663 1664.. option:: -finput-charset=<arg> 1665 1666.. option:: -finstrument-function-entry-bare 1667 1668Instrument function entry only, after inlining, without arguments to the instrumentation call 1669 1670.. option:: -finstrument-functions 1671 1672Generate calls to instrument function entry and exit 1673 1674.. option:: -finstrument-functions-after-inlining 1675 1676Like -finstrument-functions, but insert the calls after inlining 1677 1678.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1679 1680Enable the integrated assembler 1681 1682.. option:: -fintegrated-cc1, -fno-integrated-cc1 1683 1684Run cc1 in-process 1685 1686.. option:: -fjump-tables, -fno-jump-tables 1687 1688Use jump tables for lowering switches 1689 1690.. option:: -fkeep-static-consts, -fno-keep-static-consts 1691 1692Keep static const variables if unused 1693 1694.. option:: -flax-vector-conversions=<arg>, -flax-vector-conversions (equivalent to -flax-vector-conversions=integer), -fno-lax-vector-conversions (equivalent to -flax-vector-conversions=none) 1695 1696Enable implicit vector bit-casts 1697 1698.. option:: -flimited-precision=<arg> 1699 1700.. option:: -flto, -fno-lto 1701 1702Enable LTO in 'full' mode 1703 1704.. option:: -flto-jobs=<arg> 1705 1706Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1707 1708.. program:: clang1 1709.. option:: -flto=<arg> 1710.. program:: clang 1711 1712Set LTO mode to either 'full' or 'thin' 1713 1714.. option:: -fmacro-backtrace-limit=<arg> 1715 1716.. option:: -fmath-errno, -fno-math-errno 1717 1718Require math functions to indicate errors by setting errno 1719 1720.. option:: -fmax-tokens=<arg> 1721 1722Max total number of preprocessed tokens for -Wmax-tokens. 1723 1724.. option:: -fmax-type-align=<arg> 1725 1726Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1727 1728.. option:: -fmerge-all-constants, -fno-merge-all-constants 1729 1730Allow merging of constants 1731 1732.. option:: -fmessage-length=<arg> 1733 1734Format message diagnostics so that they fit within N columns 1735 1736.. option:: -fmodule-file-deps, -fno-module-file-deps 1737 1738.. option:: -fmodule-map-file=<file> 1739 1740Load this module map file 1741 1742.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1743 1744Specify the name of the module to build 1745 1746.. option:: -fmodules, -fno-modules 1747 1748Enable the 'modules' language feature 1749 1750.. option:: -fmodules-decluse, -fno-modules-decluse 1751 1752Require declaration of modules used within a module 1753 1754.. option:: -fmodules-ignore-macro=<arg> 1755 1756Ignore the definition of the given macro when building and loading modules 1757 1758.. option:: -fmodules-search-all, -fno-modules-search-all 1759 1760Search even non-imported modules to resolve references 1761 1762.. option:: -fmodules-strict-decluse 1763 1764Like -fmodules-decluse but requires all headers to be in modules 1765 1766.. option:: -fmodules-ts 1767 1768Enable support for the C++ Modules TS 1769 1770.. option:: -fmodules-validate-input-files-content 1771 1772Validate PCM input files based on content if mtime differs 1773 1774.. option:: -fms-compatibility, -fno-ms-compatibility 1775 1776Enable full Microsoft Visual C++ compatibility 1777 1778.. option:: -fms-compatibility-version=<arg> 1779 1780Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1781 1782.. option:: -fms-extensions, -fno-ms-extensions 1783 1784Accept some non-standard constructs supported by the Microsoft compiler 1785 1786.. option:: -fms-memptr-rep=<arg> 1787 1788.. option:: -fms-volatile 1789 1790.. option:: -fmsc-version=<arg> 1791 1792Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1793 1794.. option:: -fmudflap 1795 1796.. option:: -fmudflapth 1797 1798.. option:: -fnested-functions 1799 1800.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1801 1802Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1803 1804.. option:: -fnext-runtime 1805 1806.. option:: -fno-access-control, -fno-no-access-control 1807 1808.. option:: -fno-builtin-<arg> 1809 1810Disable implicit builtin knowledge of a specific function 1811 1812.. option:: -fno-elide-type 1813 1814Do not elide types when printing diagnostics 1815 1816.. option:: -fno-max-type-align 1817 1818.. option:: -fno-operator-names 1819 1820Do not treat C++ operator name keywords as synonyms for operators 1821 1822.. option:: -fno-strict-modules-decluse 1823 1824.. option:: -fno-temp-file 1825 1826Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes 1827 1828.. option:: -fno-working-directory 1829 1830.. option:: -fno\_modules-validate-input-files-content 1831 1832.. program:: clang1 1833.. option:: -fno\_pch-validate-input-files-content 1834.. program:: clang 1835 1836.. option:: -fnostack-clash-protection 1837 1838Disable stack clash protection 1839 1840.. option:: -fnoxray-link-deps 1841 1842.. option:: -fobjc-abi-version=<arg> 1843 1844.. option:: -fobjc-arc, -fno-objc-arc 1845 1846Synthesize retain and release calls for Objective-C pointers 1847 1848.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1849 1850Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1851 1852.. option:: -fobjc-convert-messages-to-runtime-calls, -fno-objc-convert-messages-to-runtime-calls 1853 1854.. option:: -fobjc-exceptions, -fno-objc-exceptions 1855 1856Enable Objective-C exceptions 1857 1858.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1859 1860.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1861 1862.. option:: -fobjc-link-runtime 1863 1864.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1865 1866.. option:: -fobjc-nonfragile-abi-version=<arg> 1867 1868.. option:: -fobjc-runtime=<arg> 1869 1870Specify the target Objective-C runtime kind and version 1871 1872.. option:: -fobjc-sender-dependent-dispatch 1873 1874.. option:: -fobjc-weak, -fno-objc-weak 1875 1876Enable ARC-style weak references in Objective-C 1877 1878.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1879 1880.. option:: -fopenmp, -fno-openmp 1881 1882Parse OpenMP pragmas and generate parallel code. 1883 1884.. option:: -fopenmp-simd, -fno-openmp-simd 1885 1886Emit OpenMP code only for SIMD-based constructs. 1887 1888.. option:: -fopenmp-version=<arg> 1889 1890.. program:: clang1 1891.. option:: -fopenmp=<arg> 1892.. program:: clang 1893 1894.. option:: -foperator-arrow-depth=<arg> 1895 1896.. option:: -foptimization-record-file=<file> 1897 1898Specify 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. 1899 1900.. option:: -foptimization-record-passes=<regex> 1901 1902Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) 1903 1904.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1905 1906.. option:: -forder-file-instrumentation 1907 1908Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1909 1910.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1911 1912.. option:: -fpack-struct, -fno-pack-struct 1913 1914.. program:: clang1 1915.. option:: -fpack-struct=<arg> 1916.. program:: clang 1917 1918Specify the default maximum struct packing alignment 1919 1920.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1921 1922Recognize and construct Pascal-style string literals 1923 1924.. option:: -fpass-plugin=<dsopath> 1925 1926Load pass plugin from a dynamic shared object file (only with new pass manager). 1927 1928.. option:: -fpatchable-function-entry=<N,M> 1929 1930Generate M NOPs before function entry and N-M NOPs after function entry 1931 1932.. option:: -fpcc-struct-return 1933 1934Override the default ABI to return all structs on the stack 1935 1936.. option:: -fpch-preprocess 1937 1938.. option:: -fpch-validate-input-files-content 1939 1940Validate PCH input files based on content if mtime differs 1941 1942.. option:: -fpic, -fno-pic 1943 1944.. option:: -fpie, -fno-pie 1945 1946.. option:: -fplt, -fno-plt 1947 1948.. option:: -fplugin=<dsopath> 1949 1950Load the named plugin (dynamic shared object) 1951 1952.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1953 1954.. option:: -fprofile-arcs, -fno-profile-arcs 1955 1956.. option:: -fprofile-dir=<arg> 1957 1958.. option:: -fprofile-exclude-files=<arg> 1959 1960Instrument only functions from files where names don't match all the regexes separated by a semi-colon 1961 1962.. option:: -fprofile-filter-files=<arg> 1963 1964Instrument only functions from files where names match any regex separated by a semi-colon 1965 1966.. option:: -fprofile-generate, -fno-profile-generate 1967 1968Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1969 1970.. program:: clang1 1971.. option:: -fprofile-generate=<directory> 1972.. program:: clang 1973 1974Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1975 1976.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1977 1978Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1979 1980.. program:: clang1 1981.. option:: -fprofile-instr-generate=<file> 1982.. program:: clang 1983 1984Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1985 1986.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1987 1988.. program:: clang1 1989.. option:: -fprofile-instr-use=<arg> 1990.. program:: clang 1991 1992Use instrumentation data for profile-guided optimization 1993 1994.. option:: -fprofile-remapping-file=<file>, -fprofile-remapping-file <arg> 1995 1996Use the remappings described in <file> to match the profile data against names in the program 1997 1998.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1999 2000Specifies that the sample profile is accurate. If the sample 2001 profile is accurate, callsites without profile samples are marked 2002 as cold. Otherwise, treat callsites without profile samples as if 2003 we have no profile 2004 2005.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 2006 2007.. program:: clang1 2008.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 2009.. program:: clang 2010 2011Enable sample-based profile guided optimizations 2012 2013.. program:: clang1 2014.. option:: -fprofile-use=<pathname> 2015.. program:: clang 2016 2017Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 2018 2019.. option:: -freciprocal-math, -fno-reciprocal-math 2020 2021Allow division operations to be reassociated 2022 2023.. option:: -freg-struct-return 2024 2025Override the default ABI to return small structs in registers 2026 2027.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 2028 2029Use atexit or \_\_cxa\_atexit to register global destructors 2030 2031.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 2032 2033Enable C++17 relaxed template template argument matching 2034 2035.. option:: -freroll-loops, -fno-reroll-loops 2036 2037Turn on loop reroller 2038 2039.. option:: -fretain-comments-from-system-headers 2040 2041.. option:: -frewrite-imports, -fno-rewrite-imports 2042 2043.. option:: -frewrite-includes, -fno-rewrite-includes 2044 2045.. option:: -frewrite-map-file <arg> 2046 2047.. program:: clang1 2048.. option:: -frewrite-map-file=<arg> 2049.. program:: clang 2050 2051.. option:: -fropi, -fno-ropi 2052 2053Generate read-only position independent code (ARM only) 2054 2055.. option:: -frounding-math, -fno-rounding-math 2056 2057.. option:: -frtti, -fno-rtti 2058 2059.. option:: -frtti-data, -fno-rtti-data 2060 2061.. option:: -frwpi, -fno-rwpi 2062 2063Generate read-write position independent code (ARM only) 2064 2065.. option:: -fsave-optimization-record, -fno-save-optimization-record 2066 2067Generate a YAML optimization record file 2068 2069.. program:: clang1 2070.. option:: -fsave-optimization-record=<format> 2071.. program:: clang 2072 2073Generate an optimization record file in a specific format 2074 2075.. option:: -fseh-exceptions 2076 2077Use SEH style exceptions 2078 2079.. option:: -fsemantic-interposition, -fno-semantic-interposition 2080 2081.. option:: -fshort-enums, -fno-short-enums 2082 2083Allocate to an enum type only as many bytes as it needs for the declared range of possible values 2084 2085.. option:: -fshort-wchar, -fno-short-wchar 2086 2087Force wchar\_t to be a short unsigned int 2088 2089.. option:: -fshow-column, -fno-show-column 2090 2091.. option:: -fshow-overloads=<arg> 2092 2093Which overload candidates to show when overload resolution fails: best\|all; defaults to all 2094 2095.. option:: -fshow-source-location, -fno-show-source-location 2096 2097.. option:: -fsignaling-math, -fno-signaling-math 2098 2099.. option:: -fsigned-bitfields 2100 2101.. option:: -fsigned-char, -fno-signed-char, --signed-char 2102 2103char is signed 2104 2105.. option:: -fsigned-zeros, -fno-signed-zeros 2106 2107.. option:: -fsized-deallocation, -fno-sized-deallocation 2108 2109Enable C++14 sized global deallocation functions 2110 2111.. option:: -fsjlj-exceptions 2112 2113Use SjLj style exceptions 2114 2115.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 2116 2117Enable the superword-level parallelism vectorization passes 2118 2119.. option:: -fspell-checking, -fno-spell-checking 2120 2121.. option:: -fspell-checking-limit=<arg> 2122 2123.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 2124 2125Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 2126 2127.. option:: -fsplit-lto-unit, -fno-split-lto-unit 2128 2129Enables splitting of the LTO unit 2130 2131.. option:: -fsplit-stack 2132 2133.. option:: -fstack-clash-protection 2134 2135Enable stack clash protection 2136 2137.. option:: -fstack-protector, -fno-stack-protector 2138 2139Enable 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 witha 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. 2140 2141.. option:: -fstack-protector-all 2142 2143Enable stack protectors for all functions 2144 2145.. option:: -fstack-protector-strong 2146 2147Enable 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 2148 2149.. option:: -fstack-size-section, -fno-stack-size-section 2150 2151Emit section containing metadata on function stack sizes 2152 2153.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 2154 2155Emit full debug info for all types used by the program 2156 2157.. option:: -feliminate-unused-debug-types, -fno-eliminate-unused-debug-types 2158 2159Suppress (or emit) debug info for types that are unused but defined by the program. 2160 2161.. option:: -fstrict-aliasing, -fno-strict-aliasing 2162 2163.. option:: -fstrict-enums, -fno-strict-enums 2164 2165Enable optimizations based on the strict definition of an enum's value range 2166 2167.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 2168 2169Assume that overflowing float-to-int casts are undefined (default) 2170 2171.. option:: -fstrict-overflow, -fno-strict-overflow 2172 2173.. option:: -fstrict-return, -fno-strict-return 2174 2175.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 2176 2177Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 2178 2179.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 2180 2181.. option:: -fsymbol-partition=<arg> 2182 2183.. option:: -ftabstop=<arg> 2184 2185.. option:: -ftemplate-backtrace-limit=<arg> 2186 2187.. option:: -ftemplate-depth-<arg> 2188 2189.. option:: -ftemplate-depth=<arg> 2190 2191.. option:: -ftest-coverage, -fno-test-coverage 2192 2193.. option:: -fthin-link-bitcode=<arg> 2194 2195Write minimized bitcode to <file> for the ThinLTO thin link only 2196 2197.. option:: -fthinlto-index=<arg> 2198 2199Perform ThinLTO importing using provided function summary index 2200 2201.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 2202 2203.. option:: -ftime-report 2204 2205.. option:: -ftime-trace 2206 2207 2208Turn on time profiler. Generates JSON file based on output filename. Results 2209can be analyzed with chrome://tracing or `Speedscope App 2210<https://www.speedscope.app>`_ for flamegraph visualization. 2211 2212.. option:: -ftime-trace-granularity=<arg> 2213 2214Minimum time granularity (in microseconds) traced by time profiler 2215 2216.. option:: -ftls-model=<arg> 2217 2218.. option:: -ftrap-function=<arg> 2219 2220Issue call to specified function rather than a trap instruction 2221 2222.. option:: -ftrapping-math, -fno-trapping-math 2223 2224.. option:: -ftrapv 2225 2226Trap on integer overflow 2227 2228.. option:: -ftrapv-handler <arg> 2229 2230.. program:: clang1 2231.. option:: -ftrapv-handler=<function name> 2232.. program:: clang 2233 2234Specify the function to be called on overflow 2235 2236.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 2237 2238Process trigraph sequences 2239 2240.. option:: -ftrivial-auto-var-init-stop-after=<arg> 2241 2242Stop initializing trivial automatic stack variables after the specified number of instances 2243 2244.. option:: -ftrivial-auto-var-init=<arg> 2245 2246Initialize trivial automatic stack variables: uninitialized (default) \| pattern 2247 2248.. option:: -funique-basic-block-section-names, -fno-unique-basic-block-section-names 2249 2250Use unique names for basic block sections (ELF Only) 2251 2252.. option:: -funique-internal-linkage-names, -fno-unique-internal-linkage-names 2253 2254Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path 2255 2256.. option:: -funique-section-names, -fno-unique-section-names 2257 2258.. option:: -funit-at-a-time, -fno-unit-at-a-time 2259 2260.. option:: -funroll-loops, -fno-unroll-loops 2261 2262Turn on loop unroller 2263 2264.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 2265 2266.. option:: -funsigned-bitfields 2267 2268.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 2269 2270.. option:: -funwind-tables, -fno-unwind-tables 2271 2272.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 2273 2274.. option:: -fuse-init-array, -fno-use-init-array 2275 2276.. option:: -fuse-ld=<arg> 2277 2278.. option:: -fuse-line-directives, -fno-use-line-directives 2279 2280Use #line in preprocessed output 2281 2282.. option:: -fvalidate-ast-input-files-content 2283 2284Compute 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 2285 2286.. option:: -fveclib=<arg> 2287 2288Use the given vector functions library 2289 2290.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2291 2292Enable the loop vectorization passes 2293 2294.. option:: -fverbose-asm, -dA, -fno-verbose-asm 2295 2296Generate verbose assembly output 2297 2298.. option:: -fvirtual-function-elimination, -fno-virtual-function-elimination 2299 2300Enables dead virtual function elimination optimization. Requires -flto=full 2301 2302.. option:: -fvisibility-global-new-delete-hidden 2303 2304Give global C++ operator new and delete declarations hidden visibility 2305 2306.. option:: -fvisibility-inlines-hidden 2307 2308Give inline C++ member functions hidden visibility by default 2309 2310.. option:: -fvisibility-ms-compat 2311 2312Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2313 2314.. option:: -fvisibility=<arg> 2315 2316Set the default symbol visibility for all global declarations 2317 2318.. option:: -fwasm-exceptions 2319 2320Use WebAssembly style exceptions 2321 2322.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2323 2324Enables whole-program vtable optimization. Requires -flto 2325 2326.. option:: -fwrapv, -fno-wrapv 2327 2328Treat signed integer overflow as two's complement 2329 2330.. option:: -fwritable-strings 2331 2332Store string literals as writable data 2333 2334.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2335 2336Always emit \_\_xray\_customevent(...) calls even if the containing function is not always instrumented 2337 2338.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2339 2340Always emit \_\_xray\_typedevent(...) calls even if the containing function is not always instrumented 2341 2342.. option:: -fxray-always-instrument=<arg> 2343 2344DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2345 2346.. option:: -fxray-attr-list=<arg> 2347 2348Filename defining the list of functions/types for imbuing XRay attributes. 2349 2350.. option:: -fxray-function-index, -fno-xray-function-index 2351 2352.. option:: -fxray-ignore-loops, -fno-xray-ignore-loops 2353 2354Don't instrument functions with loops unless they also meet the minimum function size 2355 2356.. option:: -fxray-instruction-threshold<arg> 2357 2358.. program:: clang1 2359.. option:: -fxray-instruction-threshold=<arg> 2360.. program:: clang 2361 2362Sets the minimum function size to instrument with XRay 2363 2364.. option:: -fxray-instrument, -fno-xray-instrument 2365 2366Generate XRay instrumentation sleds on function entry and exit 2367 2368.. option:: -fxray-instrumentation-bundle=<arg> 2369 2370Select 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'. 2371 2372.. option:: -fxray-link-deps 2373 2374Tells clang to add the link dependencies for XRay. 2375 2376.. option:: -fxray-modes=<arg> 2377 2378List of modes to link in by default into XRay instrumented binaries. 2379 2380.. option:: -fxray-never-instrument=<arg> 2381 2382DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2383 2384.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2385 2386.. option:: -fzvector, -fno-zvector, -mzvector 2387 2388Enable System z vector language extension 2389 2390.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2391 2392.. option:: -pedantic-errors, --pedantic-errors 2393 2394OpenCL flags 2395------------ 2396.. option:: -cl-denorms-are-zero 2397 2398OpenCL only. Allow denormals to be flushed to zero. 2399 2400.. option:: -cl-fast-relaxed-math 2401 2402OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2403 2404.. option:: -cl-finite-math-only 2405 2406OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2407 2408.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2409 2410OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2411 2412.. option:: -cl-kernel-arg-info 2413 2414OpenCL only. Generate kernel argument metadata. 2415 2416.. option:: -cl-mad-enable 2417 2418OpenCL only. Allow use of less precise MAD computations in the generated binary. 2419 2420.. option:: -cl-no-signed-zeros 2421 2422OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2423 2424.. option:: -cl-opt-disable 2425 2426OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2427 2428.. option:: -cl-single-precision-constant 2429 2430OpenCL only. Treat double precision floating-point constant as single precision constant. 2431 2432.. option:: -cl-std=<arg> 2433 2434OpenCL language standard to compile for. 2435 2436.. option:: -cl-strict-aliasing 2437 2438OpenCL only. This option is added for compatibility with OpenCL 1.0. 2439 2440.. option:: -cl-uniform-work-group-size 2441 2442OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2443 2444.. option:: -cl-unsafe-math-optimizations 2445 2446OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2447 2448SYCL flags 2449---------- 2450.. option:: -fsycl, -fno-sycl 2451 2452Enable SYCL kernels compilation for device 2453 2454.. option:: -sycl-std=<arg> 2455 2456SYCL language standard to compile for. 2457 2458Target-dependent compilation options 2459~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2460.. option:: -G<size>, -G=<arg>, -msmall-data-limit=<arg>, -msmall-data-threshold=<arg> 2461 2462Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2463 2464.. option:: -ffixed-x1 2465 2466Reserve the x1 register (AArch64/RISC-V only) 2467 2468.. option:: -ffixed-x10 2469 2470Reserve the x10 register (AArch64/RISC-V only) 2471 2472.. option:: -ffixed-x11 2473 2474Reserve the x11 register (AArch64/RISC-V only) 2475 2476.. option:: -ffixed-x12 2477 2478Reserve the x12 register (AArch64/RISC-V only) 2479 2480.. option:: -ffixed-x13 2481 2482Reserve the x13 register (AArch64/RISC-V only) 2483 2484.. option:: -ffixed-x14 2485 2486Reserve the x14 register (AArch64/RISC-V only) 2487 2488.. option:: -ffixed-x15 2489 2490Reserve the x15 register (AArch64/RISC-V only) 2491 2492.. option:: -ffixed-x16 2493 2494Reserve the x16 register (AArch64/RISC-V only) 2495 2496.. option:: -ffixed-x17 2497 2498Reserve the x17 register (AArch64/RISC-V only) 2499 2500.. option:: -ffixed-x18 2501 2502Reserve the x18 register (AArch64/RISC-V only) 2503 2504.. option:: -ffixed-x19 2505 2506Reserve the x19 register (AArch64/RISC-V only) 2507 2508.. option:: -ffixed-x2 2509 2510Reserve the x2 register (AArch64/RISC-V only) 2511 2512.. option:: -ffixed-x20 2513 2514Reserve the x20 register (AArch64/RISC-V only) 2515 2516.. option:: -ffixed-x21 2517 2518Reserve the x21 register (AArch64/RISC-V only) 2519 2520.. option:: -ffixed-x22 2521 2522Reserve the x22 register (AArch64/RISC-V only) 2523 2524.. option:: -ffixed-x23 2525 2526Reserve the x23 register (AArch64/RISC-V only) 2527 2528.. option:: -ffixed-x24 2529 2530Reserve the x24 register (AArch64/RISC-V only) 2531 2532.. option:: -ffixed-x25 2533 2534Reserve the x25 register (AArch64/RISC-V only) 2535 2536.. option:: -ffixed-x26 2537 2538Reserve the x26 register (AArch64/RISC-V only) 2539 2540.. option:: -ffixed-x27 2541 2542Reserve the x27 register (AArch64/RISC-V only) 2543 2544.. option:: -ffixed-x28 2545 2546Reserve the x28 register (AArch64/RISC-V only) 2547 2548.. option:: -ffixed-x29 2549 2550Reserve the x29 register (AArch64/RISC-V only) 2551 2552.. option:: -ffixed-x3 2553 2554Reserve the x3 register (AArch64/RISC-V only) 2555 2556.. option:: -ffixed-x30 2557 2558Reserve the x30 register (AArch64/RISC-V only) 2559 2560.. option:: -ffixed-x31 2561 2562Reserve the x31 register (AArch64/RISC-V only) 2563 2564.. option:: -ffixed-x4 2565 2566Reserve the x4 register (AArch64/RISC-V only) 2567 2568.. option:: -ffixed-x5 2569 2570Reserve the x5 register (AArch64/RISC-V only) 2571 2572.. option:: -ffixed-x6 2573 2574Reserve the x6 register (AArch64/RISC-V only) 2575 2576.. option:: -ffixed-x7 2577 2578Reserve the x7 register (AArch64/RISC-V only) 2579 2580.. option:: -ffixed-x8 2581 2582Reserve the x8 register (AArch64/RISC-V only) 2583 2584.. option:: -ffixed-x9 2585 2586Reserve the x9 register (AArch64/RISC-V only) 2587 2588.. option:: -m16 2589 2590.. option:: -m32 2591 2592.. option:: -m64 2593 2594.. option:: -mabi=<arg> 2595 2596.. option:: -maix-struct-return 2597 2598Return all structs in memory (PPC32 only) 2599 2600.. option:: -malign-branch-boundary=<arg> 2601 2602Specify the boundary's size to align branches 2603 2604.. option:: -malign-branch=<arg1>,<arg2>... 2605 2606Specify types of branches to align 2607 2608.. option:: -malign-double 2609 2610Align doubles to two words in structs (x86 only) 2611 2612.. option:: -march=<arg> 2613 2614.. option:: -masm=<arg> 2615 2616.. option:: -mbackchain, -mno-backchain 2617 2618Link stack frames through backchain on System Z 2619 2620.. option:: -mbranches-within-32B-boundaries 2621 2622Align selected branches (fused, jcc, jmp) within 32-byte boundary 2623 2624.. option:: -mcmodel=<arg>, -mcmodel=medany (equivalent to -mcmodel=medium), -mcmodel=medlow (equivalent to -mcmodel=small) 2625 2626.. option:: -mconsole<arg> 2627 2628.. program:: clang1 2629.. 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) 2630.. program:: clang 2631 2632.. option:: -mcrc, -mno-crc 2633 2634Allow use of CRC instructions (ARM/Mips only) 2635 2636.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2637 2638.. option:: -mdll<arg> 2639 2640.. option:: -mdouble=<arg> 2641 2642Force double to be 32 bits or 64 bits 2643 2644.. option:: -mdynamic-no-pic<arg> 2645 2646.. option:: -meabi <arg> 2647 2648Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2649 2650.. option:: -menable-experimental-extensions 2651 2652Enable use of experimental RISC-V extensions. 2653 2654.. option:: -mfentry 2655 2656Insert calls to fentry at function entry (x86/SystemZ only) 2657 2658.. option:: -mfloat-abi=<arg> 2659 2660.. option:: -mfpmath=<arg> 2661 2662.. option:: -mfpu=<arg> 2663 2664.. option:: -mglobal-merge, -mno-global-merge 2665 2666Enable merging of globals 2667 2668.. option:: -mhard-float 2669 2670.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2671 2672.. option:: -mhwmult=<arg> 2673 2674.. option:: -miamcu, -mno-iamcu 2675 2676Use Intel MCU ABI 2677 2678.. option:: -mimplicit-float, -mno-implicit-float 2679 2680.. option:: -mimplicit-it=<arg> 2681 2682.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2683 2684(integrated-as) Emit an object file which can be used with an incremental linker 2685 2686.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2687 2688.. option:: -mkernel 2689 2690.. option:: -mlong-calls, -mno-long-calls 2691 2692Generate branches with extended addressability, usually via indirect jumps. 2693 2694.. option:: -mlvi-cfi, -mno-lvi-cfi 2695 2696Enable only control-flow mitigations for Load Value Injection (LVI) 2697 2698.. option:: -mlvi-hardening, -mno-lvi-hardening 2699 2700Enable all mitigations for Load Value Injection (LVI) 2701 2702.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2703 2704Set Mac OS X deployment target 2705 2706.. option:: -mmcu=<arg> 2707 2708.. option:: -mms-bitfields, -mno-ms-bitfields 2709 2710Set the default structure layout to be compatible with the Microsoft compiler standard 2711 2712.. option:: -mnop-mcount 2713 2714Generate mcount/\_\_fentry\_\_ calls as nops. To activate they need to be patched in. 2715 2716.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2717 2718Omit frame pointer setup for leaf functions 2719 2720.. option:: -moslib=<arg> 2721 2722.. option:: -mpacked-stack, -mno-packed-stack 2723 2724Use packed stack layout (SystemZ only). 2725 2726.. option:: -mpad-max-prefix-size=<arg> 2727 2728Specify maximum number of prefixes to use for padding 2729 2730.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2731 2732Use copy relocations support for PIE builds 2733 2734.. option:: -mprefer-vector-width=<arg> 2735 2736Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2737 2738.. option:: -mqdsp6-compat 2739 2740Enable hexagon-qdsp6 backward compatibility 2741 2742.. option:: -mrecip 2743 2744.. program:: clang1 2745.. option:: -mrecip=<arg1>,<arg2>... 2746.. program:: clang 2747 2748.. option:: -mrecord-mcount 2749 2750Generate a \_\_mcount\_loc section entry for each \_\_fentry\_\_ call. 2751 2752.. option:: -mred-zone, -mno-red-zone 2753 2754.. option:: -mregparm=<arg> 2755 2756.. option:: -mrelax-all, -mno-relax-all 2757 2758(integrated-as) Relax all machine instructions 2759 2760.. option:: -mretpoline, -mno-retpoline 2761 2762.. option:: -mrtd, -mno-rtd 2763 2764Make StdCall calling convention the default 2765 2766.. option:: -mseses, -mno-seses 2767 2768Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations 2769 2770.. option:: -msign-return-address=<arg> 2771 2772Select return address signing scope 2773 2774.. option:: -msoft-float, -mno-soft-float 2775 2776Use software floating point 2777 2778.. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening 2779 2780.. option:: -mstack-alignment=<arg> 2781 2782Set the stack alignment 2783 2784.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2785 2786Enable stack probes 2787 2788.. option:: -mstack-probe-size=<arg> 2789 2790Set the stack probe size 2791 2792.. option:: -mstackrealign, -mno-stackrealign 2793 2794Force realign the stack at entry to every function 2795 2796.. option:: -msvr4-struct-return 2797 2798Return small structs in registers (PPC32 only) 2799 2800.. option:: -mthread-model <arg> 2801 2802The thread model to use, e.g. posix, single (posix by default) 2803 2804.. option:: -mthreads<arg> 2805 2806.. option:: -mthumb, -mno-thumb 2807 2808.. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs 2809 2810Enable direct TLS access through segment registers (default) 2811 2812.. option:: -mtls-size=<arg> 2813 2814Specify 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) 2815 2816.. program:: clang1 2817.. option:: -mtune=<arg> 2818.. program:: clang 2819 2820Accepted for compatibility with GCC. Currently has no effect. 2821 2822.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2823 2824.. option:: -municode<arg> 2825 2826.. option:: -mvx, -mno-vx 2827 2828.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2829 2830.. option:: -mwatchos-version-min=<arg> 2831 2832.. option:: -mwavefrontsize64, -mno-wavefrontsize64 2833 2834Wavefront size 64 is used 2835 2836.. option:: -mwindows<arg> 2837 2838.. option:: -mx32 2839 2840AARCH64 2841------- 2842.. option:: -fcall-saved-x10 2843 2844Make the x10 register call-saved (AArch64 only) 2845 2846.. option:: -fcall-saved-x11 2847 2848Make the x11 register call-saved (AArch64 only) 2849 2850.. option:: -fcall-saved-x12 2851 2852Make the x12 register call-saved (AArch64 only) 2853 2854.. option:: -fcall-saved-x13 2855 2856Make the x13 register call-saved (AArch64 only) 2857 2858.. option:: -fcall-saved-x14 2859 2860Make the x14 register call-saved (AArch64 only) 2861 2862.. option:: -fcall-saved-x15 2863 2864Make the x15 register call-saved (AArch64 only) 2865 2866.. option:: -fcall-saved-x18 2867 2868Make the x18 register call-saved (AArch64 only) 2869 2870.. option:: -fcall-saved-x8 2871 2872Make the x8 register call-saved (AArch64 only) 2873 2874.. option:: -fcall-saved-x9 2875 2876Make the x9 register call-saved (AArch64 only) 2877 2878.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2879 2880Workaround Cortex-A53 erratum 835769 (AArch64 only) 2881 2882.. option:: -mgeneral-regs-only 2883 2884Generate code which only uses the general purpose registers (AArch64 only) 2885 2886AMDGPU 2887------ 2888.. option:: -mcode-object-v3, -mno-code-object-v3 2889 2890Enable code object v3 (AMDGPU only) 2891 2892.. option:: -mcumode, -mno-cumode 2893 2894CU wavefront execution mode is used (AMDGPU only) 2895 2896.. option:: -msram-ecc, -mno-sram-ecc 2897 2898Enable SRAM ECC (AMDGPU only) 2899 2900.. option:: -mxnack, -mno-xnack 2901 2902Enable XNACK (AMDGPU only) 2903 2904ARM 2905--- 2906.. option:: -fAAPCSBitfieldLoad 2907 2908Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only). 2909 2910.. option:: -ffixed-r9 2911 2912Reserve the r9 register (ARM only) 2913 2914.. option:: -mcmse 2915 2916Allow use of CMSE (Armv8-M Security Extensions) 2917 2918.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2919 2920Disallow generation of data access to code sections (ARM only) 2921 2922.. option:: -mno-movt 2923 2924Disallow use of movt/movw pairs (ARM only) 2925 2926.. option:: -mno-neg-immediates 2927 2928Disallow converting instructions with negative immediates to their negation or inversion. 2929 2930.. option:: -mnocrc 2931 2932Disallow use of CRC instructions (ARM only) 2933 2934.. option:: -mrestrict-it, -mno-restrict-it 2935 2936Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2937 2938.. option:: -mtp=<arg> 2939 2940Thread pointer access method (AArch32/AArch64 only) 2941 2942.. option:: -munaligned-access, -mno-unaligned-access 2943 2944Allow memory accesses to be unaligned (AArch32/AArch64 only) 2945 2946Hexagon 2947------- 2948.. option:: -mieee-rnd-near 2949 2950.. option:: -mmemops, -mno-memops 2951 2952Enable generation of memop instructions 2953 2954.. option:: -mnvj, -mno-nvj 2955 2956Enable generation of new-value jumps 2957 2958.. option:: -mnvs, -mno-nvs 2959 2960Enable generation of new-value stores 2961 2962.. option:: -mpackets, -mno-packets 2963 2964Enable generation of instruction packets 2965 2966Hexagon 2967------- 2968.. option:: -mhvx, -mno-hvx 2969 2970Enable Hexagon Vector eXtensions 2971 2972.. option:: -mhvx-length=<arg> 2973 2974Set Hexagon Vector Length 2975 2976.. program:: clang1 2977.. option:: -mhvx=<arg> 2978.. program:: clang 2979 2980Enable Hexagon Vector eXtensions 2981 2982MIPS 2983---- 2984.. option:: -mabicalls, -mno-abicalls 2985 2986Enable SVR4-style position-independent code (Mips only) 2987 2988.. option:: -mabs=<arg> 2989 2990.. option:: -mcheck-zero-division, -mno-check-zero-division 2991 2992.. option:: -mcompact-branches=<arg> 2993 2994.. option:: -mdouble-float 2995 2996.. option:: -mdsp, -mno-dsp 2997 2998.. option:: -mdspr2, -mno-dspr2 2999 3000.. option:: -membedded-data, -mno-embedded-data 3001 3002Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 3003 3004.. option:: -mextern-sdata, -mno-extern-sdata 3005 3006Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 3007 3008.. option:: -mfp32 3009 3010Use 32-bit floating point registers (MIPS only) 3011 3012.. option:: -mfp64 3013 3014Use 64-bit floating point registers (MIPS only) 3015 3016.. option:: -mginv, -mno-ginv 3017 3018.. option:: -mgpopt, -mno-gpopt 3019 3020Use GP relative accesses for symbols known to be in a small data section (MIPS) 3021 3022.. option:: -mindirect-jump=<arg> 3023 3024Change indirect jump instructions to inhibit speculation 3025 3026.. option:: -mips16 3027 3028.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 3029 3030.. option:: -mlocal-sdata, -mno-local-sdata 3031 3032Extend the -G behaviour to object local data (MIPS) 3033 3034.. option:: -mmadd4, -mno-madd4 3035 3036Enable the generation of 4-operand madd.s, madd.d and related instructions. 3037 3038.. option:: -mmicromips, -mno-micromips 3039 3040.. option:: -mmsa, -mno-msa 3041 3042Enable MSA ASE (MIPS only) 3043 3044.. option:: -mmt, -mno-mt 3045 3046Enable MT ASE (MIPS only) 3047 3048.. option:: -mnan=<arg> 3049 3050.. option:: -mno-mips16 3051 3052.. option:: -msingle-float 3053 3054.. option:: -mvirt, -mno-virt 3055 3056.. option:: -mxgot, -mno-xgot 3057 3058PowerPC 3059------- 3060.. option:: -maltivec, -mno-altivec 3061 3062.. option:: -mcmpb, -mno-cmpb 3063 3064.. option:: -mcrbits, -mno-crbits 3065 3066.. option:: -mcrypto, -mno-crypto 3067 3068.. option:: -mdirect-move, -mno-direct-move 3069 3070.. option:: -mfloat128, -mno-float128 3071 3072.. option:: -mfprnd, -mno-fprnd 3073 3074.. option:: -mhtm, -mno-htm 3075 3076.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 3077 3078.. option:: -misel, -mno-isel 3079 3080.. option:: -mlongcall, -mno-longcall 3081 3082.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 3083 3084.. option:: -mpcrel, -mno-pcrel 3085 3086.. option:: -mpopcntd, -mno-popcntd 3087 3088.. option:: -mpower10-vector, -mno-power10-vector 3089 3090.. option:: -mpower8-vector, -mno-power8-vector 3091 3092.. option:: -mpower9-vector, -mno-power9-vector 3093 3094.. option:: -mqpx, -mno-qpx 3095 3096.. option:: -msecure-plt 3097 3098.. option:: -mspe, -mno-spe 3099 3100.. option:: -mvsx, -mno-vsx 3101 3102WebAssembly 3103----------- 3104.. option:: -matomics, -mno-atomics 3105 3106.. option:: -mbulk-memory, -mno-bulk-memory 3107 3108.. option:: -mexception-handling, -mno-exception-handling 3109 3110.. option:: -mmultivalue, -mno-multivalue 3111 3112.. option:: -mmutable-globals, -mno-mutable-globals 3113 3114.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 3115 3116.. option:: -mreference-types, -mno-reference-types 3117 3118.. option:: -msign-ext, -mno-sign-ext 3119 3120.. option:: -msimd128, -mno-simd128 3121 3122.. option:: -mtail-call, -mno-tail-call 3123 3124.. option:: -munimplemented-simd128, -mno-unimplemented-simd128 3125 3126WebAssembly Driver 3127------------------ 3128.. option:: -mexec-model=<arg> 3129 3130Execution model (WebAssembly only) 3131 3132X86 3133--- 3134.. option:: -m3dnow, -mno-3dnow 3135 3136.. option:: -m3dnowa, -mno-3dnowa 3137 3138.. option:: -madx, -mno-adx 3139 3140.. option:: -maes, -mno-aes 3141 3142.. option:: -mamx-bf16, -mno-amx-bf16 3143 3144.. option:: -mamx-int8, -mno-amx-int8 3145 3146.. option:: -mamx-tile, -mno-amx-tile 3147 3148.. option:: -mavx, -mno-avx 3149 3150.. option:: -mavx2, -mno-avx2 3151 3152.. option:: -mavx512bf16, -mno-avx512bf16 3153 3154.. option:: -mavx512bitalg, -mno-avx512bitalg 3155 3156.. option:: -mavx512bw, -mno-avx512bw 3157 3158.. option:: -mavx512cd, -mno-avx512cd 3159 3160.. option:: -mavx512dq, -mno-avx512dq 3161 3162.. option:: -mavx512er, -mno-avx512er 3163 3164.. option:: -mavx512f, -mno-avx512f 3165 3166.. option:: -mavx512ifma, -mno-avx512ifma 3167 3168.. option:: -mavx512pf, -mno-avx512pf 3169 3170.. option:: -mavx512vbmi, -mno-avx512vbmi 3171 3172.. option:: -mavx512vbmi2, -mno-avx512vbmi2 3173 3174.. option:: -mavx512vl, -mno-avx512vl 3175 3176.. option:: -mavx512vnni, -mno-avx512vnni 3177 3178.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 3179 3180.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 3181 3182.. option:: -mbmi, -mno-bmi 3183 3184.. option:: -mbmi2, -mno-bmi2 3185 3186.. option:: -mcldemote, -mno-cldemote 3187 3188.. option:: -mclflushopt, -mno-clflushopt 3189 3190.. option:: -mclwb, -mno-clwb 3191 3192.. option:: -mclzero, -mno-clzero 3193 3194.. option:: -mcx16, -mno-cx16 3195 3196.. option:: -menqcmd, -mno-enqcmd 3197 3198.. option:: -mf16c, -mno-f16c 3199 3200.. option:: -mfma, -mno-fma 3201 3202.. option:: -mfma4, -mno-fma4 3203 3204.. option:: -mfsgsbase, -mno-fsgsbase 3205 3206.. option:: -mfxsr, -mno-fxsr 3207 3208.. option:: -mgfni, -mno-gfni 3209 3210.. option:: -minvpcid, -mno-invpcid 3211 3212.. option:: -mlwp, -mno-lwp 3213 3214.. option:: -mlzcnt, -mno-lzcnt 3215 3216.. option:: -mmmx, -mno-mmx 3217 3218.. option:: -mmovbe, -mno-movbe 3219 3220.. option:: -mmovdir64b, -mno-movdir64b 3221 3222.. option:: -mmovdiri, -mno-movdiri 3223 3224.. option:: -mmwaitx, -mno-mwaitx 3225 3226.. option:: -mpclmul, -mno-pclmul 3227 3228.. option:: -mpconfig, -mno-pconfig 3229 3230.. option:: -mpku, -mno-pku 3231 3232.. option:: -mpopcnt, -mno-popcnt 3233 3234.. option:: -mprefetchwt1, -mno-prefetchwt1 3235 3236.. option:: -mprfchw, -mno-prfchw 3237 3238.. option:: -mptwrite, -mno-ptwrite 3239 3240.. option:: -mrdpid, -mno-rdpid 3241 3242.. option:: -mrdrnd, -mno-rdrnd 3243 3244.. option:: -mrdseed, -mno-rdseed 3245 3246.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 3247 3248.. option:: -mrtm, -mno-rtm 3249 3250.. option:: -msahf, -mno-sahf 3251 3252.. option:: -mserialize, -mno-serialize 3253 3254.. option:: -msgx, -mno-sgx 3255 3256.. option:: -msha, -mno-sha 3257 3258.. option:: -mshstk, -mno-shstk 3259 3260.. option:: -msse, -mno-sse 3261 3262.. option:: -msse2, -mno-sse2 3263 3264.. option:: -msse3, -mno-sse3 3265 3266.. option:: -msse4.1, -mno-sse4.1 3267 3268.. program:: clang1 3269.. option:: -msse4.2, -mno-sse4.2, -msse4 3270.. program:: clang 3271 3272.. option:: -msse4a, -mno-sse4a 3273 3274.. option:: -mssse3, -mno-ssse3 3275 3276.. option:: -mtbm, -mno-tbm 3277 3278.. option:: -mtsxldtrk, -mno-tsxldtrk 3279 3280.. option:: -mvaes, -mno-vaes 3281 3282.. option:: -mvpclmulqdq, -mno-vpclmulqdq 3283 3284.. option:: -mvzeroupper, -mno-vzeroupper 3285 3286.. option:: -mwaitpkg, -mno-waitpkg 3287 3288.. option:: -mwbnoinvd, -mno-wbnoinvd 3289 3290.. option:: -mx87, -m80387, -mno-x87 3291 3292.. option:: -mxop, -mno-xop 3293 3294.. option:: -mxsave, -mno-xsave 3295 3296.. option:: -mxsavec, -mno-xsavec 3297 3298.. option:: -mxsaveopt, -mno-xsaveopt 3299 3300.. option:: -mxsaves, -mno-xsaves 3301 3302RISCV 3303----- 3304.. option:: -mrelax, -mno-relax 3305 3306Enable linker relaxation 3307 3308.. option:: -msave-restore, -mno-save-restore 3309 3310Enable using library calls for save and restore 3311 3312Long double flags 3313----------------- 3314Selects the long double implementation 3315 3316.. option:: -mlong-double-128 3317 3318Force long double to be 128 bits 3319 3320.. option:: -mlong-double-64 3321 3322Force long double to be 64 bits 3323 3324.. option:: -mlong-double-80 3325 3326Force long double to be 80 bits, padded to 128 bits for storage 3327 3328Optimization level 3329~~~~~~~~~~~~~~~~~~ 3330 3331Flags controlling how much optimization should be performed. 3332 3333.. option:: -O<arg>, -O (equivalent to -O1), --optimize, --optimize=<arg> 3334 3335.. option:: -Ofast<arg> 3336 3337Debug information generation 3338~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3339 3340Flags controlling how much and what kind of debug information should be 3341generated. 3342 3343Kind and level of debug information 3344----------------------------------- 3345.. option:: -g, --debug, --debug=<arg> 3346 3347Generate source-level debug information 3348 3349.. option:: -gdwarf 3350 3351Generate source-level debug information with the default dwarf version 3352 3353.. option:: -gdwarf-2 3354 3355Generate source-level debug information with dwarf version 2 3356 3357.. option:: -gdwarf-3 3358 3359Generate source-level debug information with dwarf version 3 3360 3361.. option:: -gdwarf-4 3362 3363Generate source-level debug information with dwarf version 4 3364 3365.. option:: -gdwarf-5 3366 3367Generate source-level debug information with dwarf version 5 3368 3369.. option:: -gfull 3370 3371.. option:: -gused 3372 3373Debug level 3374___________ 3375.. option:: -g0 3376 3377.. option:: -g2 3378 3379.. option:: -g3 3380 3381.. option:: -ggdb0 3382 3383.. option:: -ggdb1 3384 3385.. option:: -ggdb2 3386 3387.. option:: -ggdb3 3388 3389.. option:: -gline-directives-only 3390 3391Emit debug line info directives only 3392 3393.. option:: -gline-tables-only, -g1, -gmlt 3394 3395Emit debug line number tables only 3396 3397.. option:: -gmodules 3398 3399Generate debug info with external references to clang modules or precompiled headers 3400 3401Debugger to tune debug information for 3402______________________________________ 3403.. option:: -ggdb 3404 3405.. option:: -glldb 3406 3407.. option:: -gsce 3408 3409Debug information flags 3410----------------------- 3411.. option:: -gcolumn-info, -gno-column-info 3412 3413.. option:: -gdwarf-aranges 3414 3415.. option:: -gembed-source, -gno-embed-source 3416 3417Embed source text in DWARF debug sections 3418 3419.. option:: -ggnu-pubnames, -gno-gnu-pubnames 3420 3421.. option:: -gpubnames, -gno-pubnames 3422 3423.. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches 3424 3425.. option:: -gsplit-dwarf 3426 3427.. program:: clang1 3428.. option:: -gsplit-dwarf=<arg> 3429.. program:: clang 3430 3431Set DWARF fission mode to either 'split' or 'single' 3432 3433.. option:: -gstrict-dwarf, -gno-strict-dwarf 3434 3435.. option:: -gz 3436 3437DWARF debug sections compression type 3438 3439.. program:: clang1 3440.. option:: -gz=<arg> 3441.. program:: clang 3442 3443DWARF debug sections compression type 3444 3445Static analyzer flags 3446===================== 3447 3448Flags controlling the behavior of the Clang Static Analyzer. 3449 3450.. option:: -Xanalyzer <arg> 3451 3452Pass <arg> to the static analyzer 3453 3454Fortran compilation flags 3455========================= 3456 3457Flags that will be passed onto the ``gfortran`` compiler when Clang is given 3458a Fortran input. 3459 3460.. option:: -A<arg>, --assert <arg>, --assert=<arg> 3461 3462.. option:: -A-<arg> 3463 3464.. option:: -J<arg> 3465 3466.. option:: -cpp 3467 3468.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 3469 3470.. option:: -falign-commons, -fno-align-commons 3471 3472.. option:: -fall-intrinsics, -fno-all-intrinsics 3473 3474.. option:: -fautomatic, -fno-automatic 3475 3476.. option:: -fbackslash, -fno-backslash 3477 3478.. option:: -fbacktrace, -fno-backtrace 3479 3480.. option:: -fblas-matmul-limit=<arg> 3481 3482.. option:: -fbounds-check, -fno-bounds-check 3483 3484.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 3485 3486.. option:: -fcheck=<arg> 3487 3488.. option:: -fcoarray=<arg> 3489 3490.. option:: -fconvert=<arg> 3491 3492.. option:: -fcray-pointer, -fno-cray-pointer 3493 3494.. option:: -fd-lines-as-code, -fno-d-lines-as-code 3495 3496.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 3497 3498.. option:: -fdefault-double-8, -fno-default-double-8 3499 3500.. option:: -fdefault-integer-8, -fno-default-integer-8 3501 3502.. option:: -fdefault-real-8, -fno-default-real-8 3503 3504.. option:: -fdollar-ok, -fno-dollar-ok 3505 3506.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 3507 3508.. option:: -fdump-fortran-original, -fno-dump-fortran-original 3509 3510.. option:: -fdump-parse-tree, -fno-dump-parse-tree 3511 3512.. option:: -fexternal-blas, -fno-external-blas 3513 3514.. option:: -ff2c, -fno-f2c 3515 3516.. option:: -ffixed-form, -fno-fixed-form 3517 3518.. option:: -ffixed-line-length-<arg> 3519 3520.. option:: -ffpe-trap=<arg> 3521 3522.. option:: -ffree-form, -fno-free-form 3523 3524.. option:: -ffree-line-length-<arg> 3525 3526.. option:: -ffrontend-optimize, -fno-frontend-optimize 3527 3528.. option:: -fimplicit-none, -fno-implicit-none 3529 3530.. option:: -finit-character=<arg> 3531 3532.. option:: -finit-integer=<arg> 3533 3534.. option:: -finit-local-zero, -fno-init-local-zero 3535 3536.. option:: -finit-logical=<arg> 3537 3538.. option:: -finit-real=<arg> 3539 3540.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 3541 3542.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 3543 3544.. option:: -fmax-array-constructor=<arg> 3545 3546.. option:: -fmax-errors=<arg> 3547 3548.. option:: -fmax-identifier-length, -fno-max-identifier-length 3549 3550.. option:: -fmax-stack-var-size=<arg> 3551 3552.. option:: -fmax-subrecord-length=<arg> 3553 3554.. option:: -fmodule-private, -fno-module-private 3555 3556.. option:: -fpack-derived, -fno-pack-derived 3557 3558.. option:: -fprotect-parens, -fno-protect-parens 3559 3560.. option:: -frange-check, -fno-range-check 3561 3562.. option:: -freal-4-real-10, -fno-real-4-real-10 3563 3564.. option:: -freal-4-real-16, -fno-real-4-real-16 3565 3566.. option:: -freal-4-real-8, -fno-real-4-real-8 3567 3568.. option:: -freal-8-real-10, -fno-real-8-real-10 3569 3570.. option:: -freal-8-real-16, -fno-real-8-real-16 3571 3572.. option:: -freal-8-real-4, -fno-real-8-real-4 3573 3574.. option:: -frealloc-lhs, -fno-realloc-lhs 3575 3576.. option:: -frecord-marker=<arg> 3577 3578.. option:: -frecursive, -fno-recursive 3579 3580.. option:: -frepack-arrays, -fno-repack-arrays 3581 3582.. option:: -fsecond-underscore, -fno-second-underscore 3583 3584.. option:: -fsign-zero, -fno-sign-zero 3585 3586.. option:: -fstack-arrays, -fno-stack-arrays 3587 3588.. option:: -funderscoring, -fno-underscoring 3589 3590.. option:: -fwhole-file, -fno-whole-file 3591 3592.. option:: -imultilib <arg> 3593 3594.. option:: -nocpp 3595 3596.. option:: -static-libgfortran 3597 3598Linker flags 3599============ 3600Flags that are passed on to the linker 3601 3602.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3603 3604Add directory to library search path 3605 3606.. option:: -Mach 3607 3608.. option:: -T<script> 3609 3610Specify <script> as linker script 3611 3612.. option:: -Tbss<addr> 3613 3614Set starting address of BSS to <addr> 3615 3616.. option:: -Tdata<addr> 3617 3618Set starting address of DATA to <addr> 3619 3620.. option:: -Ttext<addr> 3621 3622Set starting address of TEXT to <addr> 3623 3624.. option:: -Wl,<arg>,<arg2>... 3625 3626Pass the comma separated arguments in <arg> to the linker 3627 3628.. option:: -X 3629 3630.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3631 3632Pass <arg> to the linker 3633 3634.. program:: clang1 3635.. option:: -Z 3636.. program:: clang 3637 3638.. option:: -e<arg>, --entry 3639 3640.. option:: -filelist <arg> 3641 3642.. option:: --hip-device-lib-path=<arg> 3643 3644HIP device library path. Alternative to rocm-path. 3645 3646.. option:: --hip-device-lib=<arg> 3647 3648HIP device library 3649 3650.. option:: -l<arg> 3651 3652.. option:: -r 3653 3654.. option:: -rpath <arg> 3655 3656.. option:: -s 3657 3658.. option:: -t 3659 3660.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3661 3662.. option:: -undef 3663 3664undef all system defines 3665 3666.. option:: -undefined<arg>, --no-undefined 3667 3668.. option:: -z <arg> 3669 3670Pass -z <arg> to the linker 3671 3672