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.. option:: -Xcuda-fatbinary <arg> 60 61Pass <arg> to fatbinary invocation 62 63.. option:: -Xcuda-ptxas <arg> 64 65Pass <arg> to the ptxas assembler 66 67.. option:: -Xopenmp-target <arg> 68 69Pass <arg> to the target offloading toolchain. 70 71.. program:: clang1 72.. option:: -Xopenmp-target=<triple> <arg> 73.. program:: clang 74 75Pass <arg> to the target offloading toolchain identified by <triple>. 76 77.. option:: -Z<arg> 78 79.. option:: -a<arg>, --profile-blocks 80 81.. option:: -all\_load 82 83.. option:: -allowable\_client <arg> 84 85.. option:: --analyze 86 87Run the static analyzer 88 89.. option:: --analyze-auto 90 91.. option:: --analyzer-no-default-checks 92 93.. option:: --analyzer-output<arg> 94 95Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|text). 96 97.. option:: -ansi, --ansi 98 99.. option:: -arch <arg> 100 101.. program:: clang1 102.. option:: -arch\_errors\_fatal 103.. program:: clang 104 105.. program:: clang2 106.. option:: -arch\_only <arg> 107.. program:: clang 108 109.. option:: -arcmt-migrate-emit-errors 110 111Emit ARC errors even if the migrator can fix them 112 113.. option:: -arcmt-migrate-report-output <arg> 114 115Output path for the plist report 116 117.. option:: --autocomplete=<arg> 118 119.. option:: -bind\_at\_load 120 121.. option:: -bundle 122 123.. program:: clang1 124.. option:: -bundle\_loader <arg> 125.. program:: clang 126 127.. option:: -cfguard 128 129Emit tables required for Windows Control Flow Guard. 130 131.. option:: -client\_name<arg> 132 133.. option:: -compatibility\_version<arg> 134 135.. option:: --config <arg> 136 137Specifies configuration file 138 139.. option:: --constant-cfstrings 140 141.. option:: -coverage, --coverage 142 143.. option:: --cuda-compile-host-device 144 145Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 146 147.. option:: --cuda-device-only 148 149Compile CUDA code for device only 150 151.. option:: --cuda-gpu-arch=<arg>, --no-cuda-gpu-arch=<arg> 152 153CUDA GPU architecture (e.g. sm\_35). May be specified more than once. 154 155.. option:: --cuda-host-only 156 157Compile CUDA code for host only. Has no effect on non-CUDA compilations. 158 159.. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> 160 161Include PTX for the follwing GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. 162 163.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 164 165Enable device-side debug info generation. Disables ptxas optimizations. 166 167.. option:: -current\_version<arg> 168 169.. option:: -dead\_strip 170 171.. option:: -dependency-dot <arg> 172 173Filename to write DOT-formatted header dependencies to 174 175.. option:: -dependency-file <arg> 176 177Filename (or -) to write dependency output to 178 179.. option:: -dumpmachine 180 181.. option:: -dumpversion 182 183.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 184 185.. option:: -dylib\_file <arg> 186 187.. option:: -dylinker 188 189.. program:: clang1 190.. option:: -dylinker\_install\_name<arg> 191.. program:: clang 192 193.. option:: -dynamic 194 195.. option:: -dynamiclib 196 197.. option:: -emit-ast 198 199Emit Clang AST files for source inputs 200 201.. option:: -exported\_symbols\_list <arg> 202 203.. option:: -faligned-new=<arg> 204 205.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 206 207Use approximate transcendental functions 208 209.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero 210 211Flush denormal floating point values to zero in CUDA device mode. 212 213.. option:: -fcuda-rdc, -fno-cuda-rdc 214 215Generate relocatable device code, also known as separate compilation mode. 216 217.. option:: -fcuda-short-ptr, -fno-cuda-short-ptr 218 219Use 32-bit pointers for accessing const/local/shared address spaces. 220 221.. option:: -ffixed-r19 222 223Reserve register r19 (Hexagon only) 224 225.. option:: -fheinous-gnu-extensions 226 227.. option:: -flat\_namespace 228 229.. option:: -fopenmp-targets=<arg1>,<arg2>... 230 231Specify comma-separated list of triples OpenMP offloading targets to be supported 232 233.. option:: -force\_cpusubtype\_ALL 234 235.. program:: clang1 236.. option:: -force\_flat\_namespace 237.. program:: clang 238 239.. program:: clang2 240.. option:: -force\_load <arg> 241.. program:: clang 242 243.. option:: -framework <arg> 244 245.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 246 247Add -rpath with architecture-specific resource directory to the linker flags 248 249.. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> 250 251Use the gcc toolchain at the given directory 252 253.. option:: -gcodeview 254 255Generate CodeView debug information 256 257.. option:: -headerpad\_max\_install\_names<arg> 258 259.. option:: -help, --help 260 261Display available options 262 263.. option:: --help-hidden 264 265Display help for hidden options 266 267.. option:: --hip-link 268 269Link clang-offload-bundler bundles for HIP 270 271.. option:: -image\_base <arg> 272 273.. option:: -index-header-map 274 275Make the next included directory (-I or -F) an indexer header map 276 277.. option:: -init <arg> 278 279.. option:: -install\_name <arg> 280 281.. option:: -keep\_private\_externs 282 283.. option:: -lazy\_framework <arg> 284 285.. program:: clang1 286.. option:: -lazy\_library <arg> 287.. program:: clang 288 289.. option:: -mbig-endian, -EB 290 291.. option:: --migrate 292 293Run the migrator 294 295.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 296 297.. option:: -mlinker-version=<arg> 298 299.. option:: -mlittle-endian, -EL 300 301.. option:: -mllvm <arg> 302 303Additional arguments to forward to LLVM's option processing 304 305.. option:: -module-dependency-dir <arg> 306 307Directory to dump module dependencies to 308 309.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 310 311.. option:: -multi\_module 312 313.. option:: -multiply\_defined <arg> 314 315.. program:: clang1 316.. option:: -multiply\_defined\_unused <arg> 317.. program:: clang 318 319.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 320 321.. option:: --no-cuda-version-check 322 323Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 324 325.. option:: -no-integrated-cpp, --no-integrated-cpp 326 327.. option:: -no\_dead\_strip\_inits\_and\_terms 328 329.. option:: -nobuiltininc 330 331Disable builtin #include directories 332 333.. option:: -nocudainc 334 335.. option:: -nocudalib 336 337.. option:: -nodefaultlibs 338 339.. option:: -nofixprebinding 340 341.. option:: -nolibc 342 343.. option:: -nomultidefs 344 345.. option:: -nopie, -no-pie 346 347.. option:: -noprebind 348 349.. option:: -noseglinkedit 350 351.. option:: -nostartfiles 352 353.. option:: -nostdinc, --no-standard-includes 354 355.. program:: clang1 356.. option:: -nostdinc++ 357.. program:: clang 358 359Disable standard #include directories for the C++ standard library 360 361.. option:: -nostdlib, --no-standard-libraries 362 363.. program:: clang1 364.. option:: -nostdlib++ 365.. program:: clang 366 367.. option:: -nostdlibinc 368 369.. option:: -o<file>, --output <arg>, --output=<arg> 370 371Write output to <file> 372 373.. option:: -objcmt-atomic-property 374 375Make migration to 'atomic' properties 376 377.. option:: -objcmt-migrate-all 378 379Enable migration to modern ObjC 380 381.. option:: -objcmt-migrate-annotation 382 383Enable migration to property and method annotations 384 385.. option:: -objcmt-migrate-designated-init 386 387Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 388 389.. option:: -objcmt-migrate-instancetype 390 391Enable migration to infer instancetype for method result type 392 393.. option:: -objcmt-migrate-literals 394 395Enable migration to modern ObjC literals 396 397.. option:: -objcmt-migrate-ns-macros 398 399Enable migration to NS\_ENUM/NS\_OPTIONS macros 400 401.. option:: -objcmt-migrate-property 402 403Enable migration to modern ObjC property 404 405.. option:: -objcmt-migrate-property-dot-syntax 406 407Enable migration of setter/getter messages to property-dot syntax 408 409.. option:: -objcmt-migrate-protocol-conformance 410 411Enable migration to add protocol conformance on classes 412 413.. option:: -objcmt-migrate-readonly-property 414 415Enable migration to modern ObjC readonly property 416 417.. option:: -objcmt-migrate-readwrite-property 418 419Enable migration to modern ObjC readwrite property 420 421.. option:: -objcmt-migrate-subscripting 422 423Enable migration to modern ObjC subscripting 424 425.. option:: -objcmt-ns-nonatomic-iosonly 426 427Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 428 429.. option:: -objcmt-returns-innerpointer-property 430 431Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 432 433.. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> 434 435Only modify files with a filename contained in the provided directory path 436 437.. option:: -object 438 439.. option:: -p, --profile 440 441.. option:: -pagezero\_size<arg> 442 443.. option:: -pg 444 445Enable mcount instrumentation 446 447.. option:: -pie 448 449.. option:: -pipe, --pipe 450 451Use pipes between commands, when possible 452 453.. option:: -prebind 454 455.. program:: clang1 456.. option:: -prebind\_all\_twolevel\_modules 457.. program:: clang 458 459.. option:: -preload 460 461.. option:: --print-diagnostic-categories 462 463.. option:: -print-effective-triple, --print-effective-triple 464 465Print the effective target triple 466 467.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 468 469Print the full library path of <file> 470 471.. option:: -print-ivar-layout 472 473Enable Objective-C Ivar layout bitmap print trace 474 475.. option:: -print-libgcc-file-name, --print-libgcc-file-name 476 477Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 478 479.. option:: -print-multi-directory, --print-multi-directory 480 481.. option:: -print-multi-lib, --print-multi-lib 482 483.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 484 485Print the full program path of <name> 486 487.. option:: -print-resource-dir, --print-resource-dir 488 489Print the resource directory pathname 490 491.. option:: -print-search-dirs, --print-search-dirs 492 493Print the paths used for finding libraries and programs 494 495.. option:: -print-target-triple, --print-target-triple 496 497Print the normalized target triple 498 499.. option:: -private\_bundle 500 501.. option:: -pthread, -no-pthread 502 503Support POSIX threads in generated code 504 505.. option:: -pthreads 506 507.. option:: -rdynamic 508 509.. option:: -read\_only\_relocs <arg> 510 511.. option:: -relocatable-pch, --relocatable-pch 512 513Whether to build a relocatable precompiled header 514 515.. option:: -remap 516 517.. option:: -rewrite-legacy-objc 518 519Rewrite Legacy Objective-C source to C++ 520 521.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 522 523Compiler runtime library to use 524 525.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 526 527Save llvm statistics. 528 529.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 530 531Save intermediate compilation results. 532 533.. option:: -sectalign <arg1> <arg2> <arg3> 534 535.. option:: -sectcreate <arg1> <arg2> <arg3> 536 537.. option:: -sectobjectsymbols <arg1> <arg2> 538 539.. option:: -sectorder <arg1> <arg2> <arg3> 540 541.. option:: -seg1addr<arg> 542 543.. option:: -seg\_addr\_table <arg> 544 545.. program:: clang1 546.. option:: -seg\_addr\_table\_filename <arg> 547.. program:: clang 548 549.. option:: -segaddr <arg1> <arg2> 550 551.. option:: -segcreate <arg1> <arg2> <arg3> 552 553.. option:: -seglinkedit 554 555.. option:: -segprot <arg1> <arg2> <arg3> 556 557.. option:: -segs\_read\_<arg> 558 559.. program:: clang1 560.. option:: -segs\_read\_only\_addr <arg> 561.. program:: clang 562 563.. program:: clang2 564.. option:: -segs\_read\_write\_addr <arg> 565.. program:: clang 566 567.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 568 569Serialize compiler diagnostics to a file 570 571.. option:: -shared, --shared 572 573.. option:: -shared-libgcc 574 575.. option:: -shared-libsan, -shared-libasan 576 577Dynamically link the sanitizer runtime 578 579.. option:: -single\_module 580 581.. option:: -specs=<arg>, --specs=<arg> 582 583.. option:: -static, --static 584 585.. option:: -static-libgcc 586 587.. option:: -static-libsan 588 589Statically link the sanitizer runtime 590 591.. option:: -static-libstdc++ 592 593.. option:: -std-default=<arg> 594 595.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 596 597C++ standard library to use 598 599.. option:: -sub\_library<arg> 600 601.. program:: clang1 602.. option:: -sub\_umbrella<arg> 603.. program:: clang 604 605.. option:: --sysroot=<arg>, --sysroot <arg> 606 607.. option:: --target-help 608 609.. option:: --target=<arg>, -target <arg> 610 611Generate code for the given target 612 613.. option:: -time 614 615Time individual commands 616 617.. option:: -traditional, --traditional 618 619.. option:: -traditional-cpp, --traditional-cpp 620 621Enable some traditional CPP emulation 622 623.. option:: -twolevel\_namespace 624 625.. program:: clang1 626.. option:: -twolevel\_namespace\_hints 627.. program:: clang 628 629.. option:: -umbrella <arg> 630 631.. option:: -unexported\_symbols\_list <arg> 632 633.. option:: -v, --verbose 634 635Show commands to run and use verbose output 636 637.. option:: --verify-debug-info 638 639Verify the binary representation of debug output 640 641.. option:: --version 642 643Print version information 644 645.. option:: -w, --no-warnings 646 647Suppress all warnings 648 649.. option:: -weak-l<arg> 650 651.. option:: -weak\_framework <arg> 652 653.. program:: clang1 654.. option:: -weak\_library <arg> 655.. program:: clang 656 657.. program:: clang2 658.. option:: -weak\_reference\_mismatches <arg> 659.. program:: clang 660 661.. option:: -whatsloaded 662 663.. option:: -whyload 664 665.. option:: -working-directory<arg>, -working-directory=<arg> 666 667Resolve file paths relative to the specified directory 668 669.. option:: -x<language>, --language <arg>, --language=<arg> 670 671Treat subsequent input files as having type <language> 672 673.. option:: -y<arg> 674 675Actions 676======= 677The action to perform on the input. 678 679.. option:: -E, --preprocess 680 681Only run the preprocessor 682 683.. option:: -S, --assemble 684 685Only run preprocess and compilation steps 686 687.. option:: -c, --compile 688 689Only run preprocess, compile, and assemble steps 690 691.. option:: -emit-llvm 692 693Use the LLVM representation for assembler and object files 694 695.. option:: -fsyntax-only 696 697.. option:: -module-file-info 698 699Provide information about a particular module file 700 701.. option:: --precompile 702 703Only precompile the input 704 705.. option:: -rewrite-objc 706 707Rewrite Objective-C source to C++ 708 709.. option:: -verify-pch 710 711Load and verify that a pre-compiled header file is not stale 712 713Compilation flags 714================= 715 716Flags controlling the behavior of Clang during compilation. These flags have 717no effect during actions that do not perform compilation. 718 719.. option:: -Xassembler <arg> 720 721Pass <arg> to the assembler 722 723.. option:: -Xclang <arg> 724 725Pass <arg> to the clang compiler 726 727.. option:: -fclang-abi-compat=<version> 728 729Attempt to match the ABI of Clang <version> 730 731.. option:: -fcomment-block-commands=<arg>,<arg2>... 732 733Treat each comma separated argument in <arg> as a documentation comment block command 734 735.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 736 737Require member pointer base types to be complete if they would be significant under the Microsoft ABI 738 739.. option:: -fcrash-diagnostics-dir=<arg> 740 741.. option:: -fdeclspec, -fno-declspec 742 743Allow \_\_declspec as a keyword 744 745.. option:: -fdepfile-entry=<arg> 746 747.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 748 749.. option:: -fdiagnostics-format=<arg> 750 751.. option:: -fdiagnostics-parseable-fixits 752 753Print fix-its in machine parseable form 754 755.. option:: -fdiagnostics-print-source-range-info 756 757Print source range spans in numeric form 758 759.. option:: -fdiagnostics-show-category=<arg> 760 761.. option:: -fdiscard-value-names, -fno-discard-value-names 762 763Discard value names in LLVM IR 764 765.. option:: -fexperimental-isel, -fno-experimental-isel 766 767Enables the experimental global instruction selector 768 769.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 770 771Enables an experimental new pass manager in LLVM. 772 773.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 774 775Use separate accesses for consecutive bitfield runs with legal widths and alignments. 776 777.. option:: -finline-functions, -fno-inline-functions 778 779Inline suitable functions 780 781.. option:: -finline-hint-functions 782 783Inline functions which are (explicitly or implicitly) marked inline 784 785.. option:: -fno-crash-diagnostics 786 787Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 788 789.. option:: -fno-sanitize-blacklist 790 791Don't use blacklist file for sanitizers 792 793.. option:: -fparse-all-comments 794 795.. option:: -fsanitize-address-field-padding=<arg> 796 797Level of field padding for AddressSanitizer 798 799.. option:: -fsanitize-address-globals-dead-stripping 800 801Enable linker dead stripping of globals in AddressSanitizer 802 803.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 804 805Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 806 807.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 808 809Enable "poisoning" array cookies when allocating arrays with a custom operator new\[\] in Address Sanitizer, preventing accesses to the cookies from user code. An array cookie is a small implementation-defined header added to certain array allocations to record metadata such as the length of the array. Accesses to array cookies from user code are technically allowed by the standard but are more likely to be the result of an out-of-bounds array access. 810 811An operator new\[\] is "custom" if it is not one of the allocation functions provided by the C++ standard library. Array cookies from non-custom allocation functions are always poisoned. 812 813.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 814 815Enable use-after-scope detection in AddressSanitizer 816 817.. option:: -fsanitize-blacklist=<arg> 818 819Path to blacklist file for sanitizers 820 821.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 822 823Enable control flow integrity (CFI) checks for cross-DSO calls. 824 825.. option:: -fsanitize-cfi-icall-generalize-pointers 826 827Generalize pointers in CFI indirect call type signature checks 828 829.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 830 831Specify the type of coverage instrumentation for Sanitizers 832 833.. option:: -fsanitize-link-c++-runtime 834 835.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 836 837Enable origins tracking in MemorySanitizer 838 839.. program:: clang1 840.. option:: -fsanitize-memory-track-origins=<arg> 841.. program:: clang 842 843Enable origins tracking in MemorySanitizer 844 845.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 846 847Enable use-after-destroy detection in MemorySanitizer 848 849.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 850 851.. option:: -fsanitize-recover, -fno-sanitize-recover 852 853.. program:: clang1 854.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>... 855.. program:: clang 856 857Enable recovery for specified sanitizers 858 859.. option:: -fsanitize-stats, -fno-sanitize-stats 860 861Enable sanitizer statistics gathering. 862 863.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 864 865Enable atomic operations instrumentation in ThreadSanitizer (default) 866 867.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 868 869Enable function entry/exit instrumentation in ThreadSanitizer (default) 870 871.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 872 873Enable memory access instrumentation in ThreadSanitizer (default) 874 875.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>... 876 877Enable trapping for specified sanitizers 878 879.. option:: -fsanitize-undefined-strip-path-components=<number> 880 881Strip (or keep only, if negative) a given number of path components when emitting check metadata. 882 883.. option:: -fsanitize-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error 884 885.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 886 887Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 888 889.. option:: -moutline, -mno-outline 890 891Enable function outlining (AArch64 only) 892 893.. option:: --param <arg>, --param=<arg> 894 895.. option:: -std=<arg>, --std=<arg>, --std <arg> 896 897Language standard to compile for 898 899Preprocessor flags 900~~~~~~~~~~~~~~~~~~ 901 902Flags controlling the behavior of the Clang preprocessor. 903 904.. option:: -C, --comments 905 906Include comments in preprocessed output 907 908.. option:: -CC, --comments-in-macros 909 910Include comments from within macros in preprocessed output 911 912.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 913 914Define <macro> to <value> (or 1 if <value> omitted) 915 916.. option:: -H, --trace-includes 917 918Show header includes and nesting depth 919 920.. option:: -P, --no-line-commands 921 922Disable linemarker output in -E mode 923 924.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 925 926Undefine macro <macro> 927 928.. option:: -Wp,<arg>,<arg2>... 929 930Pass the comma separated arguments in <arg> to the preprocessor 931 932.. option:: -Xpreprocessor <arg> 933 934Pass <arg> to the preprocessor 935 936Include path management 937----------------------- 938 939Flags controlling how ``#include``\s are resolved to files. 940 941.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 942 943Add directory to include search path 944 945.. option:: -I-, --include-barrier 946 947Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 948 949.. option:: --cuda-path-ignore-env 950 951Ignore environment variables to detect CUDA installation 952 953.. option:: --cuda-path=<arg> 954 955CUDA installation path 956 957.. option:: -cxx-isystem<directory> 958 959Add directory to the C++ SYSTEM include search path 960 961.. option:: -fbuild-session-file=<file> 962 963Use the last modification time of <file> as the build session timestamp 964 965.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 966 967Time when the current build session started 968 969.. option:: -fmodule-file=\[<name>=\]<file> 970 971Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 972 973.. option:: -fmodules-cache-path=<directory> 974 975Specify the module cache path 976 977.. option:: -fmodules-disable-diagnostic-validation 978 979Disable validation of the diagnostic options when loading the module 980 981.. option:: -fmodules-prune-after=<seconds> 982 983Specify the interval (in seconds) after which a module file will be considered unused 984 985.. option:: -fmodules-prune-interval=<seconds> 986 987Specify the interval (in seconds) between attempts to prune the module cache 988 989.. option:: -fmodules-user-build-path <directory> 990 991Specify the module user build path 992 993.. option:: -fmodules-validate-once-per-build-session 994 995Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 996 997.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 998 999Validate the system headers that a module depends on when loading the module 1000 1001.. option:: -fprebuilt-module-path=<directory> 1002 1003Specify the prebuilt module path 1004 1005.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1006 1007Add directory to AFTER include search path 1008 1009.. option:: -iframework<arg> 1010 1011Add directory to SYSTEM framework search path 1012 1013.. option:: -iframeworkwithsysroot<directory> 1014 1015Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1016 1017.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1018 1019Include macros from file before parsing 1020 1021.. option:: -include<file>, --include<file>, --include=<arg> 1022 1023Include file before parsing 1024 1025.. option:: -include-pch <file> 1026 1027Include precompiled header file 1028 1029.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1030 1031Set the -iwithprefix/-iwithprefixbefore prefix 1032 1033.. option:: -iquote<directory> 1034 1035Add directory to QUOTE include search path 1036 1037.. option:: -isysroot<dir> 1038 1039Set the system root directory (usually /) 1040 1041.. option:: -isystem<directory> 1042 1043Add directory to SYSTEM include search path 1044 1045.. option:: -isystem-after<directory> 1046 1047Add directory to end of the SYSTEM include search path 1048 1049.. option:: -ivfsoverlay<arg> 1050 1051Overlay the virtual filesystem described by file over the real file system 1052 1053.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1054 1055Set directory to SYSTEM include search path with prefix 1056 1057.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1058 1059Set directory to include search path with prefix 1060 1061.. option:: -iwithsysroot<directory> 1062 1063Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1064 1065.. option:: --ptxas-path=<arg> 1066 1067Path to ptxas (used for compiling CUDA code) 1068 1069.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1070 1071Treat all #include paths starting with <prefix> as including a system header. 1072 1073Dependency file generation 1074-------------------------- 1075 1076Flags controlling generation of a dependency file for ``make``-like build 1077systems. 1078 1079.. option:: -M, --dependencies 1080 1081Like -MD, but also implies -E and writes to stdout by default 1082 1083.. option:: -MD, --write-dependencies 1084 1085Write a depfile containing user and system headers 1086 1087.. option:: -MF<file> 1088 1089Write depfile output from -MMD, -MD, -MM, or -M to <file> 1090 1091.. option:: -MG, --print-missing-file-dependencies 1092 1093Add missing headers to depfile 1094 1095.. option:: -MJ<arg> 1096 1097Write a compilation database entry per input 1098 1099.. option:: -MM, --user-dependencies 1100 1101Like -MMD, but also implies -E and writes to stdout by default 1102 1103.. option:: -MMD, --write-user-dependencies 1104 1105Write a depfile containing user headers 1106 1107.. option:: -MP 1108 1109Create phony target for each dependency (other than main file) 1110 1111.. option:: -MQ<arg> 1112 1113Specify name of main file output to quote in depfile 1114 1115.. option:: -MT<arg> 1116 1117Specify name of main file output in depfile 1118 1119.. option:: -MV 1120 1121Use NMake/Jom format for the depfile 1122 1123Dumping preprocessor state 1124-------------------------- 1125 1126Flags allowing the state of the preprocessor to be dumped in various ways. 1127 1128.. option:: -d 1129 1130.. program:: clang1 1131.. option:: -d<arg> 1132.. program:: clang 1133 1134.. option:: -dA 1135 1136.. option:: -dD 1137 1138Print macro definitions in -E mode in addition to normal output 1139 1140.. option:: -dI 1141 1142Print include directives in -E mode in addition to normal output 1143 1144.. option:: -dM 1145 1146Print macro definitions in -E mode instead of normal output 1147 1148Diagnostic flags 1149~~~~~~~~~~~~~~~~ 1150 1151Flags controlling which warnings, errors, and remarks Clang will generate. 1152See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1153 1154.. option:: -R<remark> 1155 1156Enable the specified remark 1157 1158.. option:: -Rpass-analysis=<arg> 1159 1160Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1161 1162.. option:: -Rpass-missed=<arg> 1163 1164Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1165 1166.. option:: -Rpass=<arg> 1167 1168Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1169 1170.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1171 1172Enable the specified warning 1173 1174.. option:: -Wdeprecated, -Wno-deprecated 1175 1176Enable warnings for deprecated constructs and define \_\_DEPRECATED 1177 1178.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1179 1180Target-independent compilation options 1181~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1182.. option:: -Wframe-larger-than=<arg> 1183 1184.. option:: -fPIC, -fno-PIC 1185 1186.. option:: -fPIE, -fno-PIE 1187 1188.. option:: -faccess-control, -fno-access-control 1189 1190.. option:: -faddrsig, -fno-addrsig 1191 1192Emit an address-significance table 1193 1194.. option:: -falign-functions, -fno-align-functions 1195 1196.. program:: clang1 1197.. option:: -falign-functions=<arg> 1198.. program:: clang 1199 1200.. program:: clang1 1201.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1202.. program:: clang 1203 1204Enable C++17 aligned allocation functions 1205 1206.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1207 1208Treat editor placeholders as valid source code 1209 1210.. option:: -fallow-unsupported 1211 1212.. option:: -faltivec, -fno-altivec 1213 1214.. option:: -fansi-escape-codes 1215 1216Use ANSI escape codes for diagnostics 1217 1218.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1219 1220Use Apple's kernel extensions ABI 1221 1222.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1223 1224Enable Apple gcc-compatible #pragma pack handling 1225 1226.. option:: -fapplication-extension, -fno-application-extension 1227 1228Restrict code to those available for App Extensions 1229 1230.. option:: -fasm, -fno-asm 1231 1232.. option:: -fasm-blocks, -fno-asm-blocks 1233 1234.. option:: -fassociative-math, -fno-associative-math 1235 1236.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1237 1238.. option:: -fast 1239 1240.. option:: -fastcp 1241 1242.. option:: -fastf 1243 1244.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1245 1246.. option:: -fautolink, -fno-autolink 1247 1248.. option:: -fblocks, -fno-blocks 1249 1250Enable the 'blocks' language feature 1251 1252.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1253 1254.. option:: -fborland-extensions, -fno-borland-extensions 1255 1256Accept non-standard constructs supported by the Borland compiler 1257 1258.. option:: -fbracket-depth=<arg> 1259 1260.. option:: -fbuiltin, -fno-builtin 1261 1262.. option:: -fbuiltin-module-map 1263 1264Load the clang builtins module map file. 1265 1266.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1267 1268Enable C++ static destructor registration (the default) 1269 1270.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1271 1272.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1273 1274Instrument control-flow architecture protection. Options: return, branch, full, none. 1275 1276.. option:: -fchar8\_t, -fno-char8\_t 1277 1278Enable C++ builtin type char8\_t 1279 1280.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1281 1282.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1283 1284Use colors in diagnostics 1285 1286.. option:: -fcommon, -fno-common 1287 1288.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1289 1290.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1291 1292.. option:: -fconstant-string-class=<arg> 1293 1294.. option:: -fconstexpr-backtrace-limit=<arg> 1295 1296.. option:: -fconstexpr-depth=<arg> 1297 1298.. option:: -fconstexpr-steps=<arg> 1299 1300.. option:: -fcoroutines-ts, -fno-coroutines-ts 1301 1302Enable support for the C++ Coroutines TS 1303 1304.. option:: -fcoverage-mapping, -fno-coverage-mapping 1305 1306Generate coverage mapping to enable code coverage analysis 1307 1308.. option:: -fcreate-profile 1309 1310.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1311 1312Enable C++ exceptions 1313 1314.. option:: -fcxx-modules, -fno-cxx-modules 1315 1316.. option:: -fdata-sections, -fno-data-sections 1317 1318Place each data in its own section (ELF Only) 1319 1320.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1321 1322Emit extra debug info to make sample profile more accurate. 1323 1324.. option:: -fdebug-macro, -fno-debug-macro 1325 1326Emit macro debug information 1327 1328.. option:: -fdebug-pass-arguments 1329 1330.. option:: -fdebug-pass-structure 1331 1332.. option:: -fdebug-prefix-map=<arg> 1333 1334remap file source paths in debug info 1335 1336.. option:: -fdebug-types-section, -fno-debug-types-section 1337 1338Place debug types in their own section (ELF Only) 1339 1340.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1341 1342Parse templated function definitions at the end of the translation unit 1343 1344.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1345 1346Treat usage of null pointers as undefined behavior. 1347 1348.. option:: -fdenormal-fp-math=<arg> 1349 1350.. option:: -fdiagnostics-absolute-paths 1351 1352Print absolute paths in diagnostics 1353 1354.. option:: -fdiagnostics-color, -fno-diagnostics-color 1355 1356.. program:: clang1 1357.. option:: -fdiagnostics-color=<arg> 1358.. program:: clang 1359 1360.. option:: -fdiagnostics-hotness-threshold=<number> 1361 1362Prevent optimization remarks from being output if they do not have at least this profile count 1363 1364.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1365 1366Enable profile hotness information in diagnostic line 1367 1368.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1369 1370Display include stacks for diagnostic notes 1371 1372.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1373 1374Print option name with mappable diagnostics 1375 1376.. option:: -fdiagnostics-show-template-tree 1377 1378Print a template comparison tree for differing templates 1379 1380.. option:: -fdigraphs, -fno-digraphs 1381 1382Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1383 1384.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1385 1386Allow '$' in identifiers 1387 1388.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1389 1390Enable '\[\[\]\]' attributes in all C and C++ language modes 1391 1392.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1393 1394.. option:: -fdwarf-exceptions 1395 1396Use DWARF style exceptions 1397 1398.. option:: -felide-constructors, -fno-elide-constructors 1399 1400.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1401 1402.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1403 1404Embed LLVM bitcode (option: off, all, bitcode, marker) 1405 1406.. option:: -femit-all-decls 1407 1408Emit all declarations, even if unused 1409 1410.. option:: -femulated-tls, -fno-emulated-tls 1411 1412Use emutls functions to access thread\_local variables 1413 1414.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1415 1416.. option:: -ferror-limit=<arg> 1417 1418.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1419 1420.. option:: -fexceptions, -fno-exceptions 1421 1422Enable support for exception handling 1423 1424.. option:: -fexec-charset=<arg> 1425 1426.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1427 1428.. option:: -ffast-math, -fno-fast-math 1429 1430Allow aggressive, lossy floating-point optimizations 1431 1432.. option:: -ffinite-math-only, -fno-finite-math-only 1433 1434.. option:: -ffixed-point, -fno-fixed-point 1435 1436Enable fixed point types 1437 1438.. option:: -ffor-scope, -fno-for-scope 1439 1440.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1441 1442Emits more virtual tables to improve devirtualization 1443 1444.. option:: -fforce-enable-int128, -fno-force-enable-int128 1445 1446Enable support for int128\_t type 1447 1448.. option:: -ffp-contract=<arg> 1449 1450Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma, default) \| off (never fuse) 1451 1452.. option:: -ffreestanding 1453 1454Assert that the compilation takes place in a freestanding environment 1455 1456.. option:: -ffunction-sections, -fno-function-sections 1457 1458Place each function in its own section (ELF Only) 1459 1460.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1461 1462.. option:: -fgnu-keywords, -fno-gnu-keywords 1463 1464Allow GNU-extension keywords regardless of language standard 1465 1466.. option:: -fgnu-runtime 1467 1468Generate output compatible with the standard GNU Objective-C runtime 1469 1470.. option:: -fgnu89-inline, -fno-gnu89-inline 1471 1472Use the gnu89 inline semantics 1473 1474.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1475 1476.. option:: -fhonor-nans, -fno-honor-nans 1477 1478.. option:: -fhosted 1479 1480.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1481 1482Implicitly search the file system for module map files. 1483 1484.. option:: -fimplicit-modules, -fno-implicit-modules 1485 1486.. option:: -finput-charset=<arg> 1487 1488.. option:: -finstrument-function-entry-bare 1489 1490Instrument function entry only, after inlining, without arguments to the instrumentation call 1491 1492.. option:: -finstrument-functions 1493 1494Generate calls to instrument function entry and exit 1495 1496.. option:: -finstrument-functions-after-inlining 1497 1498Like -finstrument-functions, but insert the calls after inlining 1499 1500.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1501 1502Enable the integrated assembler 1503 1504.. option:: -fjump-tables, -fno-jump-tables 1505 1506.. option:: -fkeep-static-consts 1507 1508Keep static const variables even if unused 1509 1510.. option:: -flax-vector-conversions, -fno-lax-vector-conversions 1511 1512.. option:: -flimited-precision=<arg> 1513 1514.. option:: -flto, -fno-lto 1515 1516Enable LTO in 'full' mode 1517 1518.. option:: -flto-jobs=<arg> 1519 1520Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1521 1522.. program:: clang1 1523.. option:: -flto=<arg> 1524.. program:: clang 1525 1526Set LTO mode to either 'full' or 'thin' 1527 1528.. option:: -fmacro-backtrace-limit=<arg> 1529 1530.. option:: -fmath-errno, -fno-math-errno 1531 1532Require math functions to indicate errors by setting errno 1533 1534.. option:: -fmax-type-align=<arg> 1535 1536Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1537 1538.. option:: -fmerge-all-constants, -fno-merge-all-constants 1539 1540Allow merging of constants 1541 1542.. option:: -fmessage-length=<arg> 1543 1544.. option:: -fmodule-file-deps, -fno-module-file-deps 1545 1546.. option:: -fmodule-map-file=<file> 1547 1548Load this module map file 1549 1550.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1551 1552Specify the name of the module to build 1553 1554.. option:: -fmodules, -fno-modules 1555 1556Enable the 'modules' language feature 1557 1558.. option:: -fmodules-decluse, -fno-modules-decluse 1559 1560Require declaration of modules used within a module 1561 1562.. option:: -fmodules-ignore-macro=<arg> 1563 1564Ignore the definition of the given macro when building and loading modules 1565 1566.. option:: -fmodules-search-all, -fno-modules-search-all 1567 1568Search even non-imported modules to resolve references 1569 1570.. option:: -fmodules-strict-decluse 1571 1572Like -fmodules-decluse but requires all headers to be in modules 1573 1574.. option:: -fmodules-ts 1575 1576Enable support for the C++ Modules TS 1577 1578.. option:: -fms-compatibility, -fno-ms-compatibility 1579 1580Enable full Microsoft Visual C++ compatibility 1581 1582.. option:: -fms-compatibility-version=<arg> 1583 1584Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1585 1586.. option:: -fms-extensions, -fno-ms-extensions 1587 1588Accept some non-standard constructs supported by the Microsoft compiler 1589 1590.. option:: -fms-memptr-rep=<arg> 1591 1592.. option:: -fms-volatile<arg> 1593 1594.. option:: -fmsc-version=<arg> 1595 1596Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1597 1598.. option:: -fmudflap 1599 1600.. option:: -fmudflapth 1601 1602.. option:: -fnested-functions 1603 1604.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1605 1606Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1607 1608.. option:: -fnext-runtime 1609 1610.. option:: -fno-builtin-<arg> 1611 1612Disable implicit builtin knowledge of a specific function 1613 1614.. option:: -fno-elide-type 1615 1616Do not elide types when printing diagnostics 1617 1618.. option:: -fno-max-type-align 1619 1620.. option:: -fno-operator-names 1621 1622Do not treat C++ operator name keywords as synonyms for operators 1623 1624.. option:: -fno-rtti-data 1625 1626Control emission of RTTI data 1627 1628.. option:: -fno-strict-modules-decluse 1629 1630.. option:: -fno-working-directory 1631 1632.. option:: -fnoxray-link-deps 1633 1634.. option:: -fobjc-abi-version=<arg> 1635 1636.. option:: -fobjc-arc, -fno-objc-arc 1637 1638Synthesize retain and release calls for Objective-C pointers 1639 1640.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1641 1642Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1643 1644.. option:: -fobjc-exceptions, -fno-objc-exceptions 1645 1646Enable Objective-C exceptions 1647 1648.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1649 1650.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1651 1652.. option:: -fobjc-link-runtime 1653 1654.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1655 1656.. option:: -fobjc-nonfragile-abi-version=<arg> 1657 1658.. option:: -fobjc-runtime=<arg> 1659 1660Specify the target Objective-C runtime kind and version 1661 1662.. option:: -fobjc-sender-dependent-dispatch 1663 1664.. option:: -fobjc-weak, -fno-objc-weak 1665 1666Enable ARC-style weak references in Objective-C 1667 1668.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1669 1670.. option:: -fopenmp, -fno-openmp 1671 1672Parse OpenMP pragmas and generate parallel code. 1673 1674.. option:: -fopenmp-simd, -fno-openmp-simd 1675 1676Emit OpenMP code only for SIMD-based constructs. 1677 1678.. option:: -fopenmp-version=<arg> 1679 1680.. program:: clang1 1681.. option:: -fopenmp=<arg> 1682.. program:: clang 1683 1684.. option:: -foperator-arrow-depth=<arg> 1685 1686.. option:: -foptimization-record-file=<arg> 1687 1688Specify the file name of any generated YAML optimization record 1689 1690.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1691 1692.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1693 1694.. option:: -fpack-struct, -fno-pack-struct 1695 1696.. program:: clang1 1697.. option:: -fpack-struct=<arg> 1698.. program:: clang 1699 1700Specify the default maximum struct packing alignment 1701 1702.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1703 1704Recognize and construct Pascal-style string literals 1705 1706.. option:: -fpcc-struct-return 1707 1708Override the default ABI to return all structs on the stack 1709 1710.. option:: -fpch-preprocess 1711 1712.. option:: -fpic, -fno-pic 1713 1714.. option:: -fpie, -fno-pie 1715 1716.. option:: -fplt, -fno-plt 1717 1718Use the PLT to make function calls 1719 1720.. option:: -fplugin=<dsopath> 1721 1722Load the named plugin (dynamic shared object) 1723 1724.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1725 1726.. option:: -fprofile-arcs, -fno-profile-arcs 1727 1728.. option:: -fprofile-dir=<arg> 1729 1730.. option:: -fprofile-generate, -fno-profile-generate 1731 1732Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1733 1734.. program:: clang1 1735.. option:: -fprofile-generate=<directory> 1736.. program:: clang 1737 1738Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1739 1740.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1741 1742Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1743 1744.. program:: clang1 1745.. option:: -fprofile-instr-generate=<file> 1746.. program:: clang 1747 1748Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1749 1750.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1751 1752.. program:: clang1 1753.. option:: -fprofile-instr-use=<arg> 1754.. program:: clang 1755 1756Use instrumentation data for profile-guided optimization 1757 1758.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1759 1760Specifies that the sample profile is accurate. If the sample 1761 profile is accurate, callsites without profile samples are marked 1762 as cold. Otherwise, treat callsites without profile samples as if 1763 we have no profile 1764 1765.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 1766 1767.. program:: clang1 1768.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 1769.. program:: clang 1770 1771Enable sample-based profile guided optimizations 1772 1773.. program:: clang1 1774.. option:: -fprofile-use=<pathname> 1775.. program:: clang 1776 1777Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 1778 1779.. option:: -freciprocal-math, -fno-reciprocal-math 1780 1781Allow division operations to be reassociated 1782 1783.. option:: -freg-struct-return 1784 1785Override the default ABI to return small structs in registers 1786 1787.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 1788 1789Use atexit or \_\_cxa\_atexit to register global destructors 1790 1791.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 1792 1793Enable C++17 relaxed template template argument matching 1794 1795.. option:: -freroll-loops, -fno-reroll-loops 1796 1797Turn on loop reroller 1798 1799.. option:: -fretain-comments-from-system-headers 1800 1801.. option:: -frewrite-imports, -fno-rewrite-imports 1802 1803.. option:: -frewrite-includes, -fno-rewrite-includes 1804 1805.. option:: -frewrite-map-file <arg> 1806 1807.. program:: clang1 1808.. option:: -frewrite-map-file=<arg> 1809.. program:: clang 1810 1811.. option:: -fropi, -fno-ropi 1812 1813.. option:: -frtti, -fno-rtti 1814 1815.. option:: -frwpi, -fno-rwpi 1816 1817.. option:: -fsave-optimization-record, -fno-save-optimization-record 1818 1819Generate a YAML optimization record file 1820 1821.. option:: -fseh-exceptions 1822 1823Use SEH style exceptions 1824 1825.. option:: -fshort-enums, -fno-short-enums 1826 1827Allocate to an enum type only as many bytes as it needs for the declared range of possible values 1828 1829.. option:: -fshort-wchar, -fno-short-wchar 1830 1831Force wchar\_t to be a short unsigned int 1832 1833.. option:: -fshow-column, -fno-show-column 1834 1835.. option:: -fshow-overloads=<arg> 1836 1837Which overload candidates to show when overload resolution fails: best\|all; defaults to all 1838 1839.. option:: -fshow-source-location, -fno-show-source-location 1840 1841.. option:: -fsignaling-math, -fno-signaling-math 1842 1843.. option:: -fsigned-bitfields 1844 1845.. option:: -fsigned-char, -fno-signed-char, --signed-char 1846 1847.. option:: -fsigned-zeros, -fno-signed-zeros 1848 1849.. option:: -fsized-deallocation, -fno-sized-deallocation 1850 1851Enable C++14 sized global deallocation functions 1852 1853.. option:: -fsjlj-exceptions 1854 1855Use SjLj style exceptions 1856 1857.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 1858 1859Enable the superword-level parallelism vectorization passes 1860 1861.. option:: -fspell-checking, -fno-spell-checking 1862 1863.. option:: -fspell-checking-limit=<arg> 1864 1865.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 1866 1867Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 1868 1869.. option:: -fsplit-stack 1870 1871.. option:: -fstack-protector, -fno-stack-protector 1872 1873Enable stack protectors for functions potentially vulnerable to stack smashing 1874 1875.. option:: -fstack-protector-all 1876 1877Force the usage of stack protectors for all functions 1878 1879.. option:: -fstack-protector-strong 1880 1881Use a strong heuristic to apply stack protectors to functions 1882 1883.. option:: -fstack-size-section, -fno-stack-size-section 1884 1885Emit section containing metadata on function stack sizes 1886 1887.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 1888 1889Emit full debug info for all types used by the program 1890 1891.. option:: -fstrict-aliasing, -fno-strict-aliasing 1892 1893.. option:: -fstrict-enums, -fno-strict-enums 1894 1895Enable optimizations based on the strict definition of an enum's value range 1896 1897.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 1898 1899Assume that overflowing float-to-int casts are undefined (default) 1900 1901.. option:: -fstrict-overflow, -fno-strict-overflow 1902 1903.. option:: -fstrict-return, -fno-strict-return 1904 1905Always treat control flow paths that fall off the end of a non-void function as unreachable 1906 1907.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 1908 1909Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 1910 1911.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 1912 1913.. option:: -ftabstop=<arg> 1914 1915.. option:: -ftemplate-backtrace-limit=<arg> 1916 1917.. option:: -ftemplate-depth-<arg> 1918 1919.. option:: -ftemplate-depth=<arg> 1920 1921.. option:: -ftest-coverage 1922 1923.. option:: -fthinlto-index=<arg> 1924 1925Perform ThinLTO importing using provided function summary index 1926 1927.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 1928 1929.. option:: -ftime-report 1930 1931.. option:: -ftls-model=<arg> 1932 1933.. option:: -ftrap-function=<arg> 1934 1935Issue call to specified function rather than a trap instruction 1936 1937.. option:: -ftrapping-math, -fno-trapping-math 1938 1939.. option:: -ftrapv 1940 1941Trap on integer overflow 1942 1943.. option:: -ftrapv-handler <arg> 1944 1945.. program:: clang1 1946.. option:: -ftrapv-handler=<function name> 1947.. program:: clang 1948 1949Specify the function to be called on overflow 1950 1951.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 1952 1953Process trigraph sequences 1954 1955.. option:: -funique-section-names, -fno-unique-section-names 1956 1957Use unique names for text and data sections (ELF Only) 1958 1959.. option:: -funit-at-a-time, -fno-unit-at-a-time 1960 1961.. option:: -funroll-loops, -fno-unroll-loops 1962 1963Turn on loop unroller 1964 1965.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 1966 1967.. option:: -funsigned-bitfields 1968 1969.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 1970 1971.. option:: -funwind-tables, -fno-unwind-tables 1972 1973.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 1974 1975.. option:: -fuse-init-array, -fno-use-init-array 1976 1977Use .init\_array instead of .ctors 1978 1979.. option:: -fuse-ld=<arg> 1980 1981.. option:: -fuse-line-directives, -fno-use-line-directives 1982 1983.. option:: -fveclib=<arg> 1984 1985Use the given vector functions library 1986 1987.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 1988 1989Enable the loop vectorization passes 1990 1991.. option:: -fverbose-asm, -fno-verbose-asm 1992 1993.. option:: -fvisibility-inlines-hidden 1994 1995Give inline C++ member functions hidden visibility by default 1996 1997.. option:: -fvisibility-ms-compat 1998 1999Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2000 2001.. option:: -fvisibility=<arg> 2002 2003Set the default symbol visibility for all global declarations 2004 2005.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2006 2007Enables whole-program vtable optimization. Requires -flto 2008 2009.. option:: -fwrapv, -fno-wrapv 2010 2011Treat signed integer overflow as two's complement 2012 2013.. option:: -fwritable-strings 2014 2015Store string literals as writable data 2016 2017.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2018 2019Determine whether to always emit \_\_xray\_customevent(...) calls even if the function it appears in is not always instrumented. 2020 2021.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2022 2023Determine whether to always emit \_\_xray\_typedevent(...) calls even if the function it appears in is not always instrumented. 2024 2025.. option:: -fxray-always-instrument=<arg> 2026 2027DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2028 2029.. option:: -fxray-attr-list=<arg> 2030 2031Filename defining the list of functions/types for imbuing XRay attributes. 2032 2033.. option:: -fxray-instruction-threshold<arg> 2034 2035.. program:: clang1 2036.. option:: -fxray-instruction-threshold=<arg> 2037.. program:: clang 2038 2039Sets the minimum function size to instrument with XRay 2040 2041.. option:: -fxray-instrument, -fno-xray-instrument 2042 2043Generate XRay instrumentation sleds on function entry and exit 2044 2045.. option:: -fxray-instrumentation-bundle=<arg> 2046 2047Select which XRay instrumentation points to emit. Options: all, none, function, custom. Default is 'all'. 2048 2049.. option:: -fxray-link-deps 2050 2051Tells clang to add the link dependencies for XRay. 2052 2053.. option:: -fxray-modes=<arg> 2054 2055List of modes to link in by default into XRay instrumented binaries. 2056 2057.. option:: -fxray-never-instrument=<arg> 2058 2059DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2060 2061.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2062 2063.. option:: -fzvector, -fno-zvector, -mzvector 2064 2065Enable System z vector language extension 2066 2067.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2068 2069.. option:: -pedantic-errors, --pedantic-errors 2070 2071OpenCL flags 2072------------ 2073.. option:: -cl-denorms-are-zero 2074 2075OpenCL only. Allow denormals to be flushed to zero. 2076 2077.. option:: -cl-fast-relaxed-math 2078 2079OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2080 2081.. option:: -cl-finite-math-only 2082 2083OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2084 2085.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2086 2087OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2088 2089.. option:: -cl-kernel-arg-info 2090 2091OpenCL only. Generate kernel argument metadata. 2092 2093.. option:: -cl-mad-enable 2094 2095OpenCL only. Allow use of less precise MAD computations in the generated binary. 2096 2097.. option:: -cl-no-signed-zeros 2098 2099OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2100 2101.. option:: -cl-opt-disable 2102 2103OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2104 2105.. option:: -cl-single-precision-constant 2106 2107OpenCL only. Treat double precision floating-point constant as single precision constant. 2108 2109.. option:: -cl-std=<arg> 2110 2111OpenCL language standard to compile for. 2112 2113.. option:: -cl-strict-aliasing 2114 2115OpenCL only. This option is added for compatibility with OpenCL 1.0. 2116 2117.. option:: -cl-uniform-work-group-size 2118 2119OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2120 2121.. option:: -cl-unsafe-math-optimizations 2122 2123OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2124 2125Target-dependent compilation options 2126~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2127.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg> 2128 2129Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2130 2131.. option:: -m16 2132 2133.. option:: -m32 2134 2135.. option:: -m64 2136 2137.. option:: -mabi=<arg> 2138 2139.. option:: -malign-double 2140 2141Align doubles to two words in structs (x86 only) 2142 2143.. option:: -march=<arg> 2144 2145.. option:: -masm=<arg> 2146 2147.. option:: -mbackchain, -mno-backchain 2148 2149Link stack frames through backchain on System Z 2150 2151.. option:: -mcmodel=<arg> 2152 2153.. option:: -mconsole<arg> 2154 2155.. 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) 2156 2157.. option:: -mcrc, -mno-crc 2158 2159Allow use of CRC instructions (ARM/Mips only) 2160 2161.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2162 2163.. option:: -mdll<arg> 2164 2165.. option:: -mdynamic-no-pic<arg> 2166 2167.. option:: -meabi <arg> 2168 2169Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2170 2171.. option:: -mfentry 2172 2173Insert calls to fentry at function entry (x86 only) 2174 2175.. option:: -mfloat-abi=<arg> 2176 2177.. option:: -mfpmath=<arg> 2178 2179.. option:: -mfpu=<arg> 2180 2181.. option:: -mglobal-merge, -mno-global-merge 2182 2183Enable merging of globals 2184 2185.. option:: -mhard-float 2186 2187.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2188 2189.. option:: -miamcu, -mno-iamcu 2190 2191Use Intel MCU ABI 2192 2193.. option:: -mimplicit-float, -mno-implicit-float 2194 2195.. option:: -mimplicit-it=<arg> 2196 2197.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2198 2199(integrated-as) Emit an object file which can be used with an incremental linker 2200 2201.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2202 2203.. option:: -mkernel 2204 2205.. option:: -mlong-calls, -mno-long-calls 2206 2207Generate branches with extended addressability, usually via indirect jumps. 2208 2209.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2210 2211Set Mac OS X deployment target 2212 2213.. option:: -mmcu=<arg> 2214 2215.. option:: -mms-bitfields, -mno-ms-bitfields 2216 2217Set the default structure layout to be compatible with the Microsoft compiler standard 2218 2219.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2220 2221Omit frame pointer setup for leaf functions 2222 2223.. option:: -moslib=<arg> 2224 2225.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2226 2227Use copy relocations support for PIE builds 2228 2229.. option:: -mprefer-vector-width=<arg> 2230 2231Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2232 2233.. option:: -mqdsp6-compat 2234 2235Enable hexagon-qdsp6 backward compatibility 2236 2237.. option:: -mrecip 2238 2239.. program:: clang1 2240.. option:: -mrecip=<arg1>,<arg2>... 2241.. program:: clang 2242 2243.. option:: -mred-zone, -mno-red-zone 2244 2245.. option:: -mregparm=<arg> 2246 2247.. option:: -mrelax-all, -mno-relax-all 2248 2249(integrated-as) Relax all machine instructions 2250 2251.. option:: -mretpoline, -mno-retpoline 2252 2253.. option:: -mrtd, -mno-rtd 2254 2255Make StdCall calling convention the default 2256 2257.. option:: -msign-return-address=<arg> 2258 2259Select return address signing scope 2260 2261.. option:: -msoft-float, -mno-soft-float 2262 2263Use software floating point 2264 2265.. option:: -mstack-alignment=<arg> 2266 2267Set the stack alignment 2268 2269.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2270 2271Enable stack probes 2272 2273.. option:: -mstack-probe-size=<arg> 2274 2275Set the stack probe size 2276 2277.. option:: -mstackrealign, -mno-stackrealign 2278 2279Force realign the stack at entry to every function 2280 2281.. option:: -mthread-model <arg> 2282 2283The thread model to use, e.g. posix, single (posix by default) 2284 2285.. option:: -mthreads<arg> 2286 2287.. option:: -mthumb, -mno-thumb 2288 2289.. option:: -mtune=<arg> 2290 2291.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2292 2293.. option:: -municode<arg> 2294 2295.. option:: -mvx, -mno-vx 2296 2297.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2298 2299.. option:: -mwatchos-version-min=<arg> 2300 2301.. option:: -mwindows<arg> 2302 2303.. option:: -mx32 2304 2305AARCH64 2306------- 2307.. option:: -ffixed-x1 2308 2309Reserve the x1 register (AArch64 only) 2310 2311.. option:: -ffixed-x2 2312 2313Reserve the x2 register (AArch64 only) 2314 2315.. option:: -ffixed-x3 2316 2317Reserve the x3 register (AArch64 only) 2318 2319.. option:: -ffixed-x4 2320 2321Reserve the x4 register (AArch64 only) 2322 2323.. option:: -ffixed-x5 2324 2325Reserve the x5 register (AArch64 only) 2326 2327.. option:: -ffixed-x6 2328 2329Reserve the x6 register (AArch64 only) 2330 2331.. option:: -ffixed-x7 2332 2333Reserve the x7 register (AArch64 only) 2334 2335.. option:: -ffixed-x18 2336 2337Reserve the x18 register (AArch64 only) 2338 2339.. option:: -ffixed-x20 2340 2341Reserve the x20 register (AArch64 only) 2342 2343.. option:: -fcall-saved-x8 2344 2345Make the x8 register call-saved (AArch64 only) 2346 2347.. option:: -fcall-saved-x9 2348 2349Make the x9 register call-saved (AArch64 only) 2350 2351.. option:: -fcall-saved-x10 2352 2353Make the x10 register call-saved (AArch64 only) 2354 2355.. option:: -fcall-saved-x11 2356 2357Make the x11 register call-saved (AArch64 only) 2358 2359.. option:: -fcall-saved-x12 2360 2361Make the x12 register call-saved (AArch64 only) 2362 2363.. option:: -fcall-saved-x13 2364 2365Make the x13 register call-saved (AArch64 only) 2366 2367.. option:: -fcall-saved-x14 2368 2369Make the x14 register call-saved (AArch64 only) 2370 2371.. option:: -fcall-saved-x15 2372 2373Make the x15 register call-saved (AArch64 only) 2374 2375.. option:: -fcall-saved-x18 2376 2377Make the x18 register call-saved (AArch64 only) 2378 2379.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2380 2381Workaround Cortex-A53 erratum 835769 (AArch64 only) 2382 2383.. option:: -mgeneral-regs-only 2384 2385Generate code which only uses the general purpose registers (AArch64 only) 2386 2387AMDGPU 2388------ 2389.. option:: -mxnack, -mno-xnack 2390 2391Enable XNACK (AMDGPU only) 2392 2393ARM 2394--- 2395.. option:: -ffixed-r9 2396 2397Reserve the r9 register (ARM only) 2398 2399.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2400 2401Disallow generation of data access to code sections (ARM only) 2402 2403.. option:: -mno-movt 2404 2405Disallow use of movt/movw pairs (ARM only) 2406 2407.. option:: -mno-neg-immediates 2408 2409Disallow converting instructions with negative immediates to their negation or inversion. 2410 2411.. option:: -mnocrc 2412 2413Disallow use of CRC instructions (ARM only) 2414 2415.. option:: -mrestrict-it, -mno-restrict-it 2416 2417Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2418 2419.. option:: -mtp=<arg> 2420 2421Read thread pointer from coprocessor register (ARM only) 2422 2423.. option:: -munaligned-access, -mno-unaligned-access 2424 2425Allow memory accesses to be unaligned (AArch32/AArch64 only) 2426 2427Hexagon 2428------- 2429.. option:: -mieee-rnd-near 2430 2431.. option:: -mmemops, -mno-memops 2432 2433Enable generation of memop instructions 2434 2435.. option:: -mnvj, -mno-nvj 2436 2437Enable generation of new-value jumps 2438 2439.. option:: -mnvs, -mno-nvs 2440 2441Enable generation of new-value stores 2442 2443.. option:: -mpackets, -mno-packets 2444 2445Enable generation of instruction packets 2446 2447Hexagon 2448------- 2449.. option:: -mhvx, -mno-hvx 2450 2451Enable Hexagon Vector eXtensions 2452 2453.. option:: -mhvx-length=<arg> 2454 2455Set Hexagon Vector Length 2456 2457.. program:: clang1 2458.. option:: -mhvx=<arg> 2459.. program:: clang 2460 2461Enable Hexagon Vector eXtensions 2462 2463MIPS 2464---- 2465.. option:: -mabicalls, -mno-abicalls 2466 2467Enable SVR4-style position-independent code (Mips only) 2468 2469.. option:: -mabs=<arg> 2470 2471.. option:: -mcheck-zero-division, -mno-check-zero-division 2472 2473.. option:: -mcompact-branches=<arg> 2474 2475.. option:: -mdouble-float 2476 2477.. option:: -mdsp, -mno-dsp 2478 2479.. option:: -mdspr2, -mno-dspr2 2480 2481.. option:: -membedded-data, -mno-embedded-data 2482 2483Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 2484 2485.. option:: -mextern-sdata, -mno-extern-sdata 2486 2487Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 2488 2489.. option:: -mfp32 2490 2491Use 32-bit floating point registers (MIPS only) 2492 2493.. option:: -mfp64 2494 2495Use 64-bit floating point registers (MIPS only) 2496 2497.. option:: -mginv, -mno-ginv 2498 2499.. option:: -mgpopt, -mno-gpopt 2500 2501Use GP relative accesses for symbols known to be in a small data section (MIPS) 2502 2503.. option:: -mindirect-jump=<arg> 2504 2505Change indirect jump instructions to inhibit speculation 2506 2507.. option:: -mips16 2508 2509.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 2510 2511.. option:: -mlocal-sdata, -mno-local-sdata 2512 2513Extend the -G behaviour to object local data (MIPS) 2514 2515.. option:: -mmadd4, -mno-madd4 2516 2517Enable the generation of 4-operand madd.s, madd.d and related instructions. 2518 2519.. option:: -mmicromips, -mno-micromips 2520 2521.. option:: -mmsa, -mno-msa 2522 2523Enable MSA ASE (MIPS only) 2524 2525.. option:: -mmt, -mno-mt 2526 2527Enable MT ASE (MIPS only) 2528 2529.. option:: -mnan=<arg> 2530 2531.. option:: -mno-mips16 2532 2533.. option:: -msingle-float 2534 2535.. option:: -mvirt, -mno-virt 2536 2537.. option:: -mxgot, -mno-xgot 2538 2539PowerPC 2540------- 2541.. option:: -maltivec, -mno-altivec 2542 2543.. option:: -mcmpb, -mno-cmpb 2544 2545.. option:: -mcrbits, -mno-crbits 2546 2547.. option:: -mcrypto, -mno-crypto 2548 2549.. option:: -mdirect-move, -mno-direct-move 2550 2551.. option:: -mfloat128, -mno-float128 2552 2553.. option:: -mfprnd, -mno-fprnd 2554 2555.. option:: -mhtm, -mno-htm 2556 2557.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 2558 2559.. option:: -misel, -mno-isel 2560 2561.. option:: -mlongcall, -mno-longcall 2562 2563.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 2564 2565.. option:: -mpopcntd, -mno-popcntd 2566 2567.. option:: -mpower8-vector, -mno-power8-vector 2568 2569.. option:: -mpower9-vector, -mno-power9-vector 2570 2571.. option:: -mqpx, -mno-qpx 2572 2573.. option:: -msecure-plt 2574 2575.. option:: -mvsx, -mno-vsx 2576 2577WebAssembly 2578----------- 2579.. option:: -mexception-handling, -mno-exception-handling 2580 2581.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 2582 2583.. option:: -msign-ext, -mno-sign-ext 2584 2585.. option:: -msimd128, -mno-simd128 2586 2587X86 2588--- 2589.. option:: -m3dnow, -mno-3dnow 2590 2591.. option:: -m3dnowa, -mno-3dnowa 2592 2593.. option:: -madx, -mno-adx 2594 2595.. option:: -maes, -mno-aes 2596 2597.. option:: -mavx, -mno-avx 2598 2599.. option:: -mavx2, -mno-avx2 2600 2601.. option:: -mavx512bitalg, -mno-avx512bitalg 2602 2603.. option:: -mavx512bw, -mno-avx512bw 2604 2605.. option:: -mavx512cd, -mno-avx512cd 2606 2607.. option:: -mavx512dq, -mno-avx512dq 2608 2609.. option:: -mavx512er, -mno-avx512er 2610 2611.. option:: -mavx512f, -mno-avx512f 2612 2613.. option:: -mavx512ifma, -mno-avx512ifma 2614 2615.. option:: -mavx512pf, -mno-avx512pf 2616 2617.. option:: -mavx512vbmi, -mno-avx512vbmi 2618 2619.. option:: -mavx512vbmi2, -mno-avx512vbmi2 2620 2621.. option:: -mavx512vl, -mno-avx512vl 2622 2623.. option:: -mavx512vnni, -mno-avx512vnni 2624 2625.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 2626 2627.. option:: -mbmi, -mno-bmi 2628 2629.. option:: -mbmi2, -mno-bmi2 2630 2631.. option:: -mcldemote, -mno-cldemote 2632 2633.. option:: -mclflushopt, -mno-clflushopt 2634 2635.. option:: -mclwb, -mno-clwb 2636 2637.. option:: -mclzero, -mno-clzero 2638 2639.. option:: -mcx16, -mno-cx16 2640 2641.. option:: -mf16c, -mno-f16c 2642 2643.. option:: -mfma, -mno-fma 2644 2645.. option:: -mfma4, -mno-fma4 2646 2647.. option:: -mfsgsbase, -mno-fsgsbase 2648 2649.. option:: -mfxsr, -mno-fxsr 2650 2651.. option:: -mgfni, -mno-gfni 2652 2653.. option:: -minvpcid, -mno-invpcid 2654 2655.. option:: -mlwp, -mno-lwp 2656 2657.. option:: -mlzcnt, -mno-lzcnt 2658 2659.. option:: -mmmx, -mno-mmx 2660 2661.. option:: -mmovbe, -mno-movbe 2662 2663.. option:: -mmovdir64b, -mno-movdir64b 2664 2665.. option:: -mmovdiri, -mno-movdiri 2666 2667.. option:: -mmpx, -mno-mpx 2668 2669.. option:: -mmwaitx, -mno-mwaitx 2670 2671.. option:: -mpclmul, -mno-pclmul 2672 2673.. option:: -mpconfig, -mno-pconfig 2674 2675.. option:: -mpku, -mno-pku 2676 2677.. option:: -mpopcnt, -mno-popcnt 2678 2679.. option:: -mprefetchwt1, -mno-prefetchwt1 2680 2681.. option:: -mprfchw, -mno-prfchw 2682 2683.. option:: -mptwrite, -mno-ptwrite 2684 2685.. option:: -mrdpid, -mno-rdpid 2686 2687.. option:: -mrdrnd, -mno-rdrnd 2688 2689.. option:: -mrdseed, -mno-rdseed 2690 2691.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 2692 2693.. option:: -mrtm, -mno-rtm 2694 2695.. option:: -msahf, -mno-sahf 2696 2697.. option:: -msgx, -mno-sgx 2698 2699.. option:: -msha, -mno-sha 2700 2701.. option:: -mshstk, -mno-shstk 2702 2703.. option:: -msse, -mno-sse 2704 2705.. option:: -msse2, -mno-sse2 2706 2707.. option:: -msse3, -mno-sse3 2708 2709.. option:: -msse4.1, -mno-sse4.1 2710 2711.. program:: clang1 2712.. option:: -msse4.2, -mno-sse4.2, -msse4 2713.. program:: clang 2714 2715.. option:: -msse4a, -mno-sse4a 2716 2717.. option:: -mssse3, -mno-ssse3 2718 2719.. option:: -mtbm, -mno-tbm 2720 2721.. option:: -mvaes, -mno-vaes 2722 2723.. option:: -mvpclmulqdq, -mno-vpclmulqdq 2724 2725.. option:: -mwaitpkg, -mno-waitpkg 2726 2727.. option:: -mwbnoinvd, -mno-wbnoinvd 2728 2729.. option:: -mx87, -m80387, -mno-x87 2730 2731.. option:: -mxop, -mno-xop 2732 2733.. option:: -mxsave, -mno-xsave 2734 2735.. option:: -mxsavec, -mno-xsavec 2736 2737.. option:: -mxsaveopt, -mno-xsaveopt 2738 2739.. option:: -mxsaves, -mno-xsaves 2740 2741RISCV 2742----- 2743.. option:: -mrelax, -mno-relax 2744 2745Enable linker relaxation 2746 2747Optimization level 2748~~~~~~~~~~~~~~~~~~ 2749 2750Flags controlling how much optimization should be performed. 2751 2752.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg> 2753 2754.. option:: -Ofast<arg> 2755 2756Debug information generation 2757~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2758 2759Flags controlling how much and what kind of debug information should be 2760generated. 2761 2762Kind and level of debug information 2763----------------------------------- 2764.. option:: -g, --debug, --debug=<arg> 2765 2766Generate source-level debug information 2767 2768.. option:: -gdwarf-2 2769 2770Generate source-level debug information with dwarf version 2 2771 2772.. option:: -gdwarf-3 2773 2774Generate source-level debug information with dwarf version 3 2775 2776.. option:: -gdwarf-4, -gdwarf 2777 2778Generate source-level debug information with dwarf version 4 2779 2780.. option:: -gdwarf-5 2781 2782Generate source-level debug information with dwarf version 5 2783 2784.. option:: -gfull 2785 2786.. option:: -gused 2787 2788Debug level 2789___________ 2790.. option:: -g0 2791 2792.. option:: -g2 2793 2794.. option:: -g3 2795 2796.. option:: -ggdb0 2797 2798.. option:: -ggdb1 2799 2800.. option:: -ggdb2 2801 2802.. option:: -ggdb3 2803 2804.. option:: -gline-tables-only, -g1, -gmlt 2805 2806Emit debug line number tables only 2807 2808.. option:: -gmodules 2809 2810Generate debug info with external references to clang modules or precompiled headers 2811 2812Debugger to tune debug information for 2813______________________________________ 2814.. option:: -ggdb 2815 2816.. option:: -glldb 2817 2818.. option:: -gsce 2819 2820Debug information flags 2821----------------------- 2822.. option:: -gcolumn-info, -gno-column-info 2823 2824.. option:: -gdwarf-aranges 2825 2826.. option:: -gembed-source, -gno-embed-source 2827 2828Embed source text in DWARF debug sections 2829 2830.. option:: -ggnu-pubnames, -gno-gnu-pubnames 2831 2832.. option:: -gpubnames, -gno-pubnames 2833 2834.. option:: -grecord-gcc-switches, -gno-record-gcc-switches 2835 2836.. option:: -gsplit-dwarf 2837 2838.. option:: -gstrict-dwarf, -gno-strict-dwarf 2839 2840.. option:: -gz 2841 2842DWARF debug sections compression type 2843 2844.. program:: clang1 2845.. option:: -gz=<arg> 2846.. program:: clang 2847 2848DWARF debug sections compression type 2849 2850Static analyzer flags 2851===================== 2852 2853Flags controlling the behavior of the Clang Static Analyzer. 2854 2855.. option:: -Xanalyzer <arg> 2856 2857Pass <arg> to the static analyzer 2858 2859Fortran compilation flags 2860========================= 2861 2862Flags that will be passed onto the ``gfortran`` compiler when Clang is given 2863a Fortran input. 2864 2865.. option:: -A<arg>, --assert <arg>, --assert=<arg> 2866 2867.. option:: -A-<arg> 2868 2869.. option:: -J<arg> 2870 2871.. option:: -cpp 2872 2873.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 2874 2875.. option:: -falign-commons, -fno-align-commons 2876 2877.. option:: -fall-intrinsics, -fno-all-intrinsics 2878 2879.. option:: -fautomatic, -fno-automatic 2880 2881.. option:: -fbackslash, -fno-backslash 2882 2883.. option:: -fbacktrace, -fno-backtrace 2884 2885.. option:: -fblas-matmul-limit=<arg> 2886 2887.. option:: -fbounds-check, -fno-bounds-check 2888 2889.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 2890 2891.. option:: -fcheck=<arg> 2892 2893.. option:: -fcoarray=<arg> 2894 2895.. option:: -fconvert=<arg> 2896 2897.. option:: -fcray-pointer, -fno-cray-pointer 2898 2899.. option:: -fd-lines-as-code, -fno-d-lines-as-code 2900 2901.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 2902 2903.. option:: -fdefault-double-8, -fno-default-double-8 2904 2905.. option:: -fdefault-integer-8, -fno-default-integer-8 2906 2907.. option:: -fdefault-real-8, -fno-default-real-8 2908 2909.. option:: -fdollar-ok, -fno-dollar-ok 2910 2911.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 2912 2913.. option:: -fdump-fortran-original, -fno-dump-fortran-original 2914 2915.. option:: -fdump-parse-tree, -fno-dump-parse-tree 2916 2917.. option:: -fexternal-blas, -fno-external-blas 2918 2919.. option:: -ff2c, -fno-f2c 2920 2921.. option:: -ffixed-form, -fno-fixed-form 2922 2923.. option:: -ffixed-line-length-<arg> 2924 2925.. option:: -ffpe-trap=<arg> 2926 2927.. option:: -ffree-form, -fno-free-form 2928 2929.. option:: -ffree-line-length-<arg> 2930 2931.. option:: -ffrontend-optimize, -fno-frontend-optimize 2932 2933.. option:: -fimplicit-none, -fno-implicit-none 2934 2935.. option:: -finit-character=<arg> 2936 2937.. option:: -finit-integer=<arg> 2938 2939.. option:: -finit-local-zero, -fno-init-local-zero 2940 2941.. option:: -finit-logical=<arg> 2942 2943.. option:: -finit-real=<arg> 2944 2945.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 2946 2947.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 2948 2949.. option:: -fmax-array-constructor=<arg> 2950 2951.. option:: -fmax-errors=<arg> 2952 2953.. option:: -fmax-identifier-length, -fno-max-identifier-length 2954 2955.. option:: -fmax-stack-var-size=<arg> 2956 2957.. option:: -fmax-subrecord-length=<arg> 2958 2959.. option:: -fmodule-private, -fno-module-private 2960 2961.. option:: -fpack-derived, -fno-pack-derived 2962 2963.. option:: -fprotect-parens, -fno-protect-parens 2964 2965.. option:: -frange-check, -fno-range-check 2966 2967.. option:: -freal-4-real-10, -fno-real-4-real-10 2968 2969.. option:: -freal-4-real-16, -fno-real-4-real-16 2970 2971.. option:: -freal-4-real-8, -fno-real-4-real-8 2972 2973.. option:: -freal-8-real-10, -fno-real-8-real-10 2974 2975.. option:: -freal-8-real-16, -fno-real-8-real-16 2976 2977.. option:: -freal-8-real-4, -fno-real-8-real-4 2978 2979.. option:: -frealloc-lhs, -fno-realloc-lhs 2980 2981.. option:: -frecord-marker=<arg> 2982 2983.. option:: -frecursive, -fno-recursive 2984 2985.. option:: -frepack-arrays, -fno-repack-arrays 2986 2987.. option:: -fsecond-underscore, -fno-second-underscore 2988 2989.. option:: -fsign-zero, -fno-sign-zero 2990 2991.. option:: -fstack-arrays, -fno-stack-arrays 2992 2993.. option:: -funderscoring, -fno-underscoring 2994 2995.. option:: -fwhole-file, -fno-whole-file 2996 2997.. option:: -imultilib <arg> 2998 2999.. option:: -nocpp 3000 3001.. option:: -static-libgfortran 3002 3003Linker flags 3004============ 3005Flags that are passed on to the linker 3006 3007.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3008 3009Add directory to library search path 3010 3011.. option:: -Mach 3012 3013.. option:: -T<script> 3014 3015Specify <script> as linker script 3016 3017.. option:: -Tbss<addr> 3018 3019Set starting address of BSS to <addr> 3020 3021.. option:: -Tdata<addr> 3022 3023Set starting address of DATA to <addr> 3024 3025.. option:: -Ttext<addr> 3026 3027Set starting address of TEXT to <addr> 3028 3029.. option:: -Wl,<arg>,<arg2>... 3030 3031Pass the comma separated arguments in <arg> to the linker 3032 3033.. option:: -X 3034 3035.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3036 3037Pass <arg> to the linker 3038 3039.. program:: clang1 3040.. option:: -Z 3041.. program:: clang 3042 3043.. option:: -e<arg>, --entry 3044 3045.. option:: -filelist <arg> 3046 3047.. option:: --hip-device-lib-path=<arg> 3048 3049HIP device library path 3050 3051.. option:: --hip-device-lib=<arg> 3052 3053HIP device library 3054 3055.. option:: -l<arg> 3056 3057.. option:: -r 3058 3059.. option:: -rpath <arg> 3060 3061.. option:: -s 3062 3063.. option:: -t 3064 3065.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3066 3067.. option:: -undef 3068 3069undef all system defines 3070 3071.. option:: -undefined<arg>, --no-undefined 3072 3073.. option:: -z <arg> 3074 3075Pass -z <arg> to the linker 3076 3077