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-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 804 805Enable "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. 806 807An 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. 808 809.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 810 811Enable use-after-scope detection in AddressSanitizer 812 813.. option:: -fsanitize-blacklist=<arg> 814 815Path to blacklist file for sanitizers 816 817.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 818 819Enable control flow integrity (CFI) checks for cross-DSO calls. 820 821.. option:: -fsanitize-cfi-icall-generalize-pointers 822 823Generalize pointers in CFI indirect call type signature checks 824 825.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 826 827Specify the type of coverage instrumentation for Sanitizers 828 829.. option:: -fsanitize-link-c++-runtime 830 831.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 832 833Enable origins tracking in MemorySanitizer 834 835.. program:: clang1 836.. option:: -fsanitize-memory-track-origins=<arg> 837.. program:: clang 838 839Enable origins tracking in MemorySanitizer 840 841.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 842 843Enable use-after-destroy detection in MemorySanitizer 844 845.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 846 847.. option:: -fsanitize-recover, -fno-sanitize-recover 848 849.. program:: clang1 850.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>... 851.. program:: clang 852 853Enable recovery for specified sanitizers 854 855.. option:: -fsanitize-stats, -fno-sanitize-stats 856 857Enable sanitizer statistics gathering. 858 859.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 860 861Enable atomic operations instrumentation in ThreadSanitizer (default) 862 863.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 864 865Enable function entry/exit instrumentation in ThreadSanitizer (default) 866 867.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 868 869Enable memory access instrumentation in ThreadSanitizer (default) 870 871.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>... 872 873Enable trapping for specified sanitizers 874 875.. option:: -fsanitize-undefined-strip-path-components=<number> 876 877Strip (or keep only, if negative) a given number of path components when emitting check metadata. 878 879.. option:: -fsanitize-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error 880 881.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 882 883Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 884 885.. option:: -moutline, -mno-outline 886 887Enable function outlining (AArch64 only) 888 889.. option:: --param <arg>, --param=<arg> 890 891.. option:: -std=<arg>, --std=<arg>, --std <arg> 892 893Language standard to compile for 894 895Preprocessor flags 896~~~~~~~~~~~~~~~~~~ 897 898Flags controlling the behavior of the Clang preprocessor. 899 900.. option:: -C, --comments 901 902Include comments in preprocessed output 903 904.. option:: -CC, --comments-in-macros 905 906Include comments from within macros in preprocessed output 907 908.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 909 910Define <macro> to <value> (or 1 if <value> omitted) 911 912.. option:: -H, --trace-includes 913 914Show header includes and nesting depth 915 916.. option:: -P, --no-line-commands 917 918Disable linemarker output in -E mode 919 920.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 921 922Undefine macro <macro> 923 924.. option:: -Wp,<arg>,<arg2>... 925 926Pass the comma separated arguments in <arg> to the preprocessor 927 928.. option:: -Xpreprocessor <arg> 929 930Pass <arg> to the preprocessor 931 932Include path management 933----------------------- 934 935Flags controlling how ``#include``\s are resolved to files. 936 937.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 938 939Add directory to include search path 940 941.. option:: -I-, --include-barrier 942 943Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 944 945.. option:: --cuda-path-ignore-env 946 947Ignore environment variables to detect CUDA installation 948 949.. option:: --cuda-path=<arg> 950 951CUDA installation path 952 953.. option:: -cxx-isystem<directory> 954 955Add directory to the C++ SYSTEM include search path 956 957.. option:: -fbuild-session-file=<file> 958 959Use the last modification time of <file> as the build session timestamp 960 961.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 962 963Time when the current build session started 964 965.. option:: -fmodule-file=\[<name>=\]<file> 966 967Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 968 969.. option:: -fmodules-cache-path=<directory> 970 971Specify the module cache path 972 973.. option:: -fmodules-disable-diagnostic-validation 974 975Disable validation of the diagnostic options when loading the module 976 977.. option:: -fmodules-prune-after=<seconds> 978 979Specify the interval (in seconds) after which a module file will be considered unused 980 981.. option:: -fmodules-prune-interval=<seconds> 982 983Specify the interval (in seconds) between attempts to prune the module cache 984 985.. option:: -fmodules-user-build-path <directory> 986 987Specify the module user build path 988 989.. option:: -fmodules-validate-once-per-build-session 990 991Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 992 993.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 994 995Validate the system headers that a module depends on when loading the module 996 997.. option:: -fprebuilt-module-path=<directory> 998 999Specify the prebuilt module path 1000 1001.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1002 1003Add directory to AFTER include search path 1004 1005.. option:: -iframework<arg> 1006 1007Add directory to SYSTEM framework search path 1008 1009.. option:: -iframeworkwithsysroot<directory> 1010 1011Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1012 1013.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1014 1015Include macros from file before parsing 1016 1017.. option:: -include<file>, --include<file>, --include=<arg> 1018 1019Include file before parsing 1020 1021.. option:: -include-pch <file> 1022 1023Include precompiled header file 1024 1025.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1026 1027Set the -iwithprefix/-iwithprefixbefore prefix 1028 1029.. option:: -iquote<directory> 1030 1031Add directory to QUOTE include search path 1032 1033.. option:: -isysroot<dir> 1034 1035Set the system root directory (usually /) 1036 1037.. option:: -isystem<directory> 1038 1039Add directory to SYSTEM include search path 1040 1041.. option:: -isystem-after<directory> 1042 1043Add directory to end of the SYSTEM include search path 1044 1045.. option:: -ivfsoverlay<arg> 1046 1047Overlay the virtual filesystem described by file over the real file system 1048 1049.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1050 1051Set directory to SYSTEM include search path with prefix 1052 1053.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1054 1055Set directory to include search path with prefix 1056 1057.. option:: -iwithsysroot<directory> 1058 1059Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1060 1061.. option:: --ptxas-path=<arg> 1062 1063Path to ptxas (used for compiling CUDA code) 1064 1065.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1066 1067Treat all #include paths starting with <prefix> as including a system header. 1068 1069Dependency file generation 1070-------------------------- 1071 1072Flags controlling generation of a dependency file for ``make``-like build 1073systems. 1074 1075.. option:: -M, --dependencies 1076 1077Like -MD, but also implies -E and writes to stdout by default 1078 1079.. option:: -MD, --write-dependencies 1080 1081Write a depfile containing user and system headers 1082 1083.. option:: -MF<file> 1084 1085Write depfile output from -MMD, -MD, -MM, or -M to <file> 1086 1087.. option:: -MG, --print-missing-file-dependencies 1088 1089Add missing headers to depfile 1090 1091.. option:: -MJ<arg> 1092 1093Write a compilation database entry per input 1094 1095.. option:: -MM, --user-dependencies 1096 1097Like -MMD, but also implies -E and writes to stdout by default 1098 1099.. option:: -MMD, --write-user-dependencies 1100 1101Write a depfile containing user headers 1102 1103.. option:: -MP 1104 1105Create phony target for each dependency (other than main file) 1106 1107.. option:: -MQ<arg> 1108 1109Specify name of main file output to quote in depfile 1110 1111.. option:: -MT<arg> 1112 1113Specify name of main file output in depfile 1114 1115.. option:: -MV 1116 1117Use NMake/Jom format for the depfile 1118 1119Dumping preprocessor state 1120-------------------------- 1121 1122Flags allowing the state of the preprocessor to be dumped in various ways. 1123 1124.. option:: -d 1125 1126.. program:: clang1 1127.. option:: -d<arg> 1128.. program:: clang 1129 1130.. option:: -dA 1131 1132.. option:: -dD 1133 1134Print macro definitions in -E mode in addition to normal output 1135 1136.. option:: -dI 1137 1138Print include directives in -E mode in addition to normal output 1139 1140.. option:: -dM 1141 1142Print macro definitions in -E mode instead of normal output 1143 1144Diagnostic flags 1145~~~~~~~~~~~~~~~~ 1146 1147Flags controlling which warnings, errors, and remarks Clang will generate. 1148See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1149 1150.. option:: -R<remark> 1151 1152Enable the specified remark 1153 1154.. option:: -Rpass-analysis=<arg> 1155 1156Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1157 1158.. option:: -Rpass-missed=<arg> 1159 1160Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1161 1162.. option:: -Rpass=<arg> 1163 1164Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1165 1166.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1167 1168Enable the specified warning 1169 1170.. option:: -Wdeprecated, -Wno-deprecated 1171 1172Enable warnings for deprecated constructs and define \_\_DEPRECATED 1173 1174.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1175 1176Target-independent compilation options 1177~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1178.. option:: -Wframe-larger-than=<arg> 1179 1180.. option:: -fPIC, -fno-PIC 1181 1182.. option:: -fPIE, -fno-PIE 1183 1184.. option:: -faccess-control, -fno-access-control 1185 1186.. option:: -faddrsig, -fno-addrsig 1187 1188Emit an address-significance table 1189 1190.. option:: -falign-functions, -fno-align-functions 1191 1192.. program:: clang1 1193.. option:: -falign-functions=<arg> 1194.. program:: clang 1195 1196.. program:: clang1 1197.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1198.. program:: clang 1199 1200Enable C++17 aligned allocation functions 1201 1202.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1203 1204Treat editor placeholders as valid source code 1205 1206.. option:: -fallow-unsupported 1207 1208.. option:: -faltivec, -fno-altivec 1209 1210.. option:: -fansi-escape-codes 1211 1212Use ANSI escape codes for diagnostics 1213 1214.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1215 1216Use Apple's kernel extensions ABI 1217 1218.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1219 1220Enable Apple gcc-compatible #pragma pack handling 1221 1222.. option:: -fapplication-extension, -fno-application-extension 1223 1224Restrict code to those available for App Extensions 1225 1226.. option:: -fasm, -fno-asm 1227 1228.. option:: -fasm-blocks, -fno-asm-blocks 1229 1230.. option:: -fassociative-math, -fno-associative-math 1231 1232.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1233 1234.. option:: -fast 1235 1236.. option:: -fastcp 1237 1238.. option:: -fastf 1239 1240.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1241 1242.. option:: -fautolink, -fno-autolink 1243 1244.. option:: -fblocks, -fno-blocks 1245 1246Enable the 'blocks' language feature 1247 1248.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1249 1250.. option:: -fborland-extensions, -fno-borland-extensions 1251 1252Accept non-standard constructs supported by the Borland compiler 1253 1254.. option:: -fbracket-depth=<arg> 1255 1256.. option:: -fbuiltin, -fno-builtin 1257 1258.. option:: -fbuiltin-module-map 1259 1260Load the clang builtins module map file. 1261 1262.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1263 1264Enable C++ static destructor registration (the default) 1265 1266.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1267 1268.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1269 1270Instrument control-flow architecture protection. Options: return, branch, full, none. 1271 1272.. option:: -fchar8\_t, -fno-char8\_t 1273 1274Enable C++ builtin type char8\_t 1275 1276.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1277 1278.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1279 1280Use colors in diagnostics 1281 1282.. option:: -fcommon, -fno-common 1283 1284.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1285 1286.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1287 1288.. option:: -fconstant-string-class=<arg> 1289 1290.. option:: -fconstexpr-backtrace-limit=<arg> 1291 1292.. option:: -fconstexpr-depth=<arg> 1293 1294.. option:: -fconstexpr-steps=<arg> 1295 1296.. option:: -fcoroutines-ts, -fno-coroutines-ts 1297 1298Enable support for the C++ Coroutines TS 1299 1300.. option:: -fcoverage-mapping, -fno-coverage-mapping 1301 1302Generate coverage mapping to enable code coverage analysis 1303 1304.. option:: -fcreate-profile 1305 1306.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1307 1308Enable C++ exceptions 1309 1310.. option:: -fcxx-modules, -fno-cxx-modules 1311 1312.. option:: -fdata-sections, -fno-data-sections 1313 1314Place each data in its own section (ELF Only) 1315 1316.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1317 1318Emit extra debug info to make sample profile more accurate. 1319 1320.. option:: -fdebug-macro, -fno-debug-macro 1321 1322Emit macro debug information 1323 1324.. option:: -fdebug-pass-arguments 1325 1326.. option:: -fdebug-pass-structure 1327 1328.. option:: -fdebug-prefix-map=<arg> 1329 1330remap file source paths in debug info 1331 1332.. option:: -fdebug-types-section, -fno-debug-types-section 1333 1334Place debug types in their own section (ELF Only) 1335 1336.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1337 1338Parse templated function definitions at the end of the translation unit 1339 1340.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1341 1342Treat usage of null pointers as undefined behavior. 1343 1344.. option:: -fdenormal-fp-math=<arg> 1345 1346.. option:: -fdiagnostics-absolute-paths 1347 1348Print absolute paths in diagnostics 1349 1350.. option:: -fdiagnostics-color, -fno-diagnostics-color 1351 1352.. program:: clang1 1353.. option:: -fdiagnostics-color=<arg> 1354.. program:: clang 1355 1356.. option:: -fdiagnostics-hotness-threshold=<number> 1357 1358Prevent optimization remarks from being output if they do not have at least this profile count 1359 1360.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1361 1362Enable profile hotness information in diagnostic line 1363 1364.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1365 1366Display include stacks for diagnostic notes 1367 1368.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1369 1370Print option name with mappable diagnostics 1371 1372.. option:: -fdiagnostics-show-template-tree 1373 1374Print a template comparison tree for differing templates 1375 1376.. option:: -fdigraphs, -fno-digraphs 1377 1378Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1379 1380.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1381 1382Allow '$' in identifiers 1383 1384.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1385 1386Enable '\[\[\]\]' attributes in all C and C++ language modes 1387 1388.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1389 1390.. option:: -fdwarf-exceptions 1391 1392Use DWARF style exceptions 1393 1394.. option:: -felide-constructors, -fno-elide-constructors 1395 1396.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1397 1398.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1399 1400Embed LLVM bitcode (option: off, all, bitcode, marker) 1401 1402.. option:: -femit-all-decls 1403 1404Emit all declarations, even if unused 1405 1406.. option:: -femulated-tls, -fno-emulated-tls 1407 1408Use emutls functions to access thread\_local variables 1409 1410.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1411 1412.. option:: -ferror-limit=<arg> 1413 1414.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1415 1416.. option:: -fexceptions, -fno-exceptions 1417 1418Enable support for exception handling 1419 1420.. option:: -fexec-charset=<arg> 1421 1422.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1423 1424.. option:: -ffast-math, -fno-fast-math 1425 1426Allow aggressive, lossy floating-point optimizations 1427 1428.. option:: -ffinite-math-only, -fno-finite-math-only 1429 1430.. option:: -ffixed-point, -fno-fixed-point 1431 1432Enable fixed point types 1433 1434.. option:: -ffor-scope, -fno-for-scope 1435 1436.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1437 1438Emits more virtual tables to improve devirtualization 1439 1440.. option:: -fforce-enable-int128, -fno-force-enable-int128 1441 1442Enable support for int128\_t type 1443 1444.. option:: -ffp-contract=<arg> 1445 1446Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma, default) \| off (never fuse) 1447 1448.. option:: -ffreestanding 1449 1450Assert that the compilation takes place in a freestanding environment 1451 1452.. option:: -ffunction-sections, -fno-function-sections 1453 1454Place each function in its own section (ELF Only) 1455 1456.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1457 1458.. option:: -fgnu-keywords, -fno-gnu-keywords 1459 1460Allow GNU-extension keywords regardless of language standard 1461 1462.. option:: -fgnu-runtime 1463 1464Generate output compatible with the standard GNU Objective-C runtime 1465 1466.. option:: -fgnu89-inline, -fno-gnu89-inline 1467 1468Use the gnu89 inline semantics 1469 1470.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1471 1472.. option:: -fhonor-nans, -fno-honor-nans 1473 1474.. option:: -fhosted 1475 1476.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1477 1478Implicitly search the file system for module map files. 1479 1480.. option:: -fimplicit-modules, -fno-implicit-modules 1481 1482.. option:: -finput-charset=<arg> 1483 1484.. option:: -finstrument-function-entry-bare 1485 1486Instrument function entry only, after inlining, without arguments to the instrumentation call 1487 1488.. option:: -finstrument-functions 1489 1490Generate calls to instrument function entry and exit 1491 1492.. option:: -finstrument-functions-after-inlining 1493 1494Like -finstrument-functions, but insert the calls after inlining 1495 1496.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1497 1498Enable the integrated assembler 1499 1500.. option:: -fjump-tables, -fno-jump-tables 1501 1502.. option:: -fkeep-static-consts 1503 1504Keep static const variables even if unused 1505 1506.. option:: -flax-vector-conversions, -fno-lax-vector-conversions 1507 1508.. option:: -flimited-precision=<arg> 1509 1510.. option:: -flto, -fno-lto 1511 1512Enable LTO in 'full' mode 1513 1514.. option:: -flto-jobs=<arg> 1515 1516Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1517 1518.. program:: clang1 1519.. option:: -flto=<arg> 1520.. program:: clang 1521 1522Set LTO mode to either 'full' or 'thin' 1523 1524.. option:: -fmacro-backtrace-limit=<arg> 1525 1526.. option:: -fmath-errno, -fno-math-errno 1527 1528Require math functions to indicate errors by setting errno 1529 1530.. option:: -fmax-type-align=<arg> 1531 1532Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1533 1534.. option:: -fmerge-all-constants, -fno-merge-all-constants 1535 1536Allow merging of constants 1537 1538.. option:: -fmessage-length=<arg> 1539 1540.. option:: -fmodule-file-deps, -fno-module-file-deps 1541 1542.. option:: -fmodule-map-file=<file> 1543 1544Load this module map file 1545 1546.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1547 1548Specify the name of the module to build 1549 1550.. option:: -fmodules, -fno-modules 1551 1552Enable the 'modules' language feature 1553 1554.. option:: -fmodules-decluse, -fno-modules-decluse 1555 1556Require declaration of modules used within a module 1557 1558.. option:: -fmodules-ignore-macro=<arg> 1559 1560Ignore the definition of the given macro when building and loading modules 1561 1562.. option:: -fmodules-search-all, -fno-modules-search-all 1563 1564Search even non-imported modules to resolve references 1565 1566.. option:: -fmodules-strict-decluse 1567 1568Like -fmodules-decluse but requires all headers to be in modules 1569 1570.. option:: -fmodules-ts 1571 1572Enable support for the C++ Modules TS 1573 1574.. option:: -fms-compatibility, -fno-ms-compatibility 1575 1576Enable full Microsoft Visual C++ compatibility 1577 1578.. option:: -fms-compatibility-version=<arg> 1579 1580Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1581 1582.. option:: -fms-extensions, -fno-ms-extensions 1583 1584Accept some non-standard constructs supported by the Microsoft compiler 1585 1586.. option:: -fms-memptr-rep=<arg> 1587 1588.. option:: -fms-volatile<arg> 1589 1590.. option:: -fmsc-version=<arg> 1591 1592Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1593 1594.. option:: -fmudflap 1595 1596.. option:: -fmudflapth 1597 1598.. option:: -fnested-functions 1599 1600.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1601 1602Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1603 1604.. option:: -fnext-runtime 1605 1606.. option:: -fno-builtin-<arg> 1607 1608Disable implicit builtin knowledge of a specific function 1609 1610.. option:: -fno-elide-type 1611 1612Do not elide types when printing diagnostics 1613 1614.. option:: -fno-max-type-align 1615 1616.. option:: -fno-operator-names 1617 1618Do not treat C++ operator name keywords as synonyms for operators 1619 1620.. option:: -fno-rtti-data 1621 1622Control emission of RTTI data 1623 1624.. option:: -fno-strict-modules-decluse 1625 1626.. option:: -fno-working-directory 1627 1628.. option:: -fnoxray-link-deps 1629 1630.. option:: -fobjc-abi-version=<arg> 1631 1632.. option:: -fobjc-arc, -fno-objc-arc 1633 1634Synthesize retain and release calls for Objective-C pointers 1635 1636.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1637 1638Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1639 1640.. option:: -fobjc-exceptions, -fno-objc-exceptions 1641 1642Enable Objective-C exceptions 1643 1644.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1645 1646.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1647 1648.. option:: -fobjc-link-runtime 1649 1650.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1651 1652.. option:: -fobjc-nonfragile-abi-version=<arg> 1653 1654.. option:: -fobjc-runtime=<arg> 1655 1656Specify the target Objective-C runtime kind and version 1657 1658.. option:: -fobjc-sender-dependent-dispatch 1659 1660.. option:: -fobjc-weak, -fno-objc-weak 1661 1662Enable ARC-style weak references in Objective-C 1663 1664.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1665 1666.. option:: -fopenmp, -fno-openmp 1667 1668Parse OpenMP pragmas and generate parallel code. 1669 1670.. option:: -fopenmp-simd, -fno-openmp-simd 1671 1672Emit OpenMP code only for SIMD-based constructs. 1673 1674.. option:: -fopenmp-version=<arg> 1675 1676.. program:: clang1 1677.. option:: -fopenmp=<arg> 1678.. program:: clang 1679 1680.. option:: -foperator-arrow-depth=<arg> 1681 1682.. option:: -foptimization-record-file=<arg> 1683 1684Specify the file name of any generated YAML optimization record 1685 1686.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1687 1688.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1689 1690.. option:: -fpack-struct, -fno-pack-struct 1691 1692.. program:: clang1 1693.. option:: -fpack-struct=<arg> 1694.. program:: clang 1695 1696Specify the default maximum struct packing alignment 1697 1698.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1699 1700Recognize and construct Pascal-style string literals 1701 1702.. option:: -fpcc-struct-return 1703 1704Override the default ABI to return all structs on the stack 1705 1706.. option:: -fpch-preprocess 1707 1708.. option:: -fpic, -fno-pic 1709 1710.. option:: -fpie, -fno-pie 1711 1712.. option:: -fplt, -fno-plt 1713 1714Use the PLT to make function calls 1715 1716.. option:: -fplugin=<dsopath> 1717 1718Load the named plugin (dynamic shared object) 1719 1720.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1721 1722.. option:: -fprofile-arcs, -fno-profile-arcs 1723 1724.. option:: -fprofile-dir=<arg> 1725 1726.. option:: -fprofile-generate, -fno-profile-generate 1727 1728Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1729 1730.. program:: clang1 1731.. option:: -fprofile-generate=<directory> 1732.. program:: clang 1733 1734Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1735 1736.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1737 1738Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1739 1740.. program:: clang1 1741.. option:: -fprofile-instr-generate=<file> 1742.. program:: clang 1743 1744Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1745 1746.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1747 1748.. program:: clang1 1749.. option:: -fprofile-instr-use=<arg> 1750.. program:: clang 1751 1752Use instrumentation data for profile-guided optimization 1753 1754.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1755 1756Specifies that the sample profile is accurate. If the sample 1757 profile is accurate, callsites without profile samples are marked 1758 as cold. Otherwise, treat callsites without profile samples as if 1759 we have no profile 1760 1761.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 1762 1763.. program:: clang1 1764.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 1765.. program:: clang 1766 1767Enable sample-based profile guided optimizations 1768 1769.. program:: clang1 1770.. option:: -fprofile-use=<pathname> 1771.. program:: clang 1772 1773Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 1774 1775.. option:: -freciprocal-math, -fno-reciprocal-math 1776 1777Allow division operations to be reassociated 1778 1779.. option:: -freg-struct-return 1780 1781Override the default ABI to return small structs in registers 1782 1783.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 1784 1785Use atexit or \_\_cxa\_atexit to register global destructors 1786 1787.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 1788 1789Enable C++17 relaxed template template argument matching 1790 1791.. option:: -freroll-loops, -fno-reroll-loops 1792 1793Turn on loop reroller 1794 1795.. option:: -fretain-comments-from-system-headers 1796 1797.. option:: -frewrite-imports, -fno-rewrite-imports 1798 1799.. option:: -frewrite-includes, -fno-rewrite-includes 1800 1801.. option:: -frewrite-map-file <arg> 1802 1803.. program:: clang1 1804.. option:: -frewrite-map-file=<arg> 1805.. program:: clang 1806 1807.. option:: -fropi, -fno-ropi 1808 1809.. option:: -frtti, -fno-rtti 1810 1811.. option:: -frwpi, -fno-rwpi 1812 1813.. option:: -fsave-optimization-record, -fno-save-optimization-record 1814 1815Generate a YAML optimization record file 1816 1817.. option:: -fseh-exceptions 1818 1819Use SEH style exceptions 1820 1821.. option:: -fshort-enums, -fno-short-enums 1822 1823Allocate to an enum type only as many bytes as it needs for the declared range of possible values 1824 1825.. option:: -fshort-wchar, -fno-short-wchar 1826 1827Force wchar\_t to be a short unsigned int 1828 1829.. option:: -fshow-column, -fno-show-column 1830 1831.. option:: -fshow-overloads=<arg> 1832 1833Which overload candidates to show when overload resolution fails: best\|all; defaults to all 1834 1835.. option:: -fshow-source-location, -fno-show-source-location 1836 1837.. option:: -fsignaling-math, -fno-signaling-math 1838 1839.. option:: -fsigned-bitfields 1840 1841.. option:: -fsigned-char, -fno-signed-char, --signed-char 1842 1843.. option:: -fsigned-zeros, -fno-signed-zeros 1844 1845.. option:: -fsized-deallocation, -fno-sized-deallocation 1846 1847Enable C++14 sized global deallocation functions 1848 1849.. option:: -fsjlj-exceptions 1850 1851Use SjLj style exceptions 1852 1853.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 1854 1855Enable the superword-level parallelism vectorization passes 1856 1857.. option:: -fspell-checking, -fno-spell-checking 1858 1859.. option:: -fspell-checking-limit=<arg> 1860 1861.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 1862 1863Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 1864 1865.. option:: -fsplit-stack 1866 1867.. option:: -fstack-protector, -fno-stack-protector 1868 1869Enable stack protectors for functions potentially vulnerable to stack smashing 1870 1871.. option:: -fstack-protector-all 1872 1873Force the usage of stack protectors for all functions 1874 1875.. option:: -fstack-protector-strong 1876 1877Use a strong heuristic to apply stack protectors to functions 1878 1879.. option:: -fstack-size-section, -fno-stack-size-section 1880 1881Emit section containing metadata on function stack sizes 1882 1883.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 1884 1885Emit full debug info for all types used by the program 1886 1887.. option:: -fstrict-aliasing, -fno-strict-aliasing 1888 1889.. option:: -fstrict-enums, -fno-strict-enums 1890 1891Enable optimizations based on the strict definition of an enum's value range 1892 1893.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 1894 1895Assume that overflowing float-to-int casts are undefined (default) 1896 1897.. option:: -fstrict-overflow, -fno-strict-overflow 1898 1899.. option:: -fstrict-return, -fno-strict-return 1900 1901Always treat control flow paths that fall off the end of a non-void function as unreachable 1902 1903.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 1904 1905Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 1906 1907.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 1908 1909.. option:: -ftabstop=<arg> 1910 1911.. option:: -ftemplate-backtrace-limit=<arg> 1912 1913.. option:: -ftemplate-depth-<arg> 1914 1915.. option:: -ftemplate-depth=<arg> 1916 1917.. option:: -ftest-coverage 1918 1919.. option:: -fthinlto-index=<arg> 1920 1921Perform ThinLTO importing using provided function summary index 1922 1923.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 1924 1925.. option:: -ftime-report 1926 1927.. option:: -ftls-model=<arg> 1928 1929.. option:: -ftrap-function=<arg> 1930 1931Issue call to specified function rather than a trap instruction 1932 1933.. option:: -ftrapping-math, -fno-trapping-math 1934 1935.. option:: -ftrapv 1936 1937Trap on integer overflow 1938 1939.. option:: -ftrapv-handler <arg> 1940 1941.. program:: clang1 1942.. option:: -ftrapv-handler=<function name> 1943.. program:: clang 1944 1945Specify the function to be called on overflow 1946 1947.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 1948 1949Process trigraph sequences 1950 1951.. option:: -funique-section-names, -fno-unique-section-names 1952 1953Use unique names for text and data sections (ELF Only) 1954 1955.. option:: -funit-at-a-time, -fno-unit-at-a-time 1956 1957.. option:: -funroll-loops, -fno-unroll-loops 1958 1959Turn on loop unroller 1960 1961.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 1962 1963.. option:: -funsigned-bitfields 1964 1965.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 1966 1967.. option:: -funwind-tables, -fno-unwind-tables 1968 1969.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 1970 1971.. option:: -fuse-init-array, -fno-use-init-array 1972 1973Use .init\_array instead of .ctors 1974 1975.. option:: -fuse-ld=<arg> 1976 1977.. option:: -fuse-line-directives, -fno-use-line-directives 1978 1979.. option:: -fveclib=<arg> 1980 1981Use the given vector functions library 1982 1983.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 1984 1985Enable the loop vectorization passes 1986 1987.. option:: -fverbose-asm, -fno-verbose-asm 1988 1989.. option:: -fvisibility-inlines-hidden 1990 1991Give inline C++ member functions hidden visibility by default 1992 1993.. option:: -fvisibility-ms-compat 1994 1995Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 1996 1997.. option:: -fvisibility=<arg> 1998 1999Set the default symbol visibility for all global declarations 2000 2001.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2002 2003Enables whole-program vtable optimization. Requires -flto 2004 2005.. option:: -fwrapv, -fno-wrapv 2006 2007Treat signed integer overflow as two's complement 2008 2009.. option:: -fwritable-strings 2010 2011Store string literals as writable data 2012 2013.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2014 2015Determine whether to always emit \_\_xray\_customevent(...) calls even if the function it appears in is not always instrumented. 2016 2017.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2018 2019Determine whether to always emit \_\_xray\_typedevent(...) calls even if the function it appears in is not always instrumented. 2020 2021.. option:: -fxray-always-instrument=<arg> 2022 2023DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2024 2025.. option:: -fxray-attr-list=<arg> 2026 2027Filename defining the list of functions/types for imbuing XRay attributes. 2028 2029.. option:: -fxray-instruction-threshold<arg> 2030 2031.. program:: clang1 2032.. option:: -fxray-instruction-threshold=<arg> 2033.. program:: clang 2034 2035Sets the minimum function size to instrument with XRay 2036 2037.. option:: -fxray-instrument, -fno-xray-instrument 2038 2039Generate XRay instrumentation sleds on function entry and exit 2040 2041.. option:: -fxray-instrumentation-bundle=<arg> 2042 2043Select which XRay instrumentation points to emit. Options: all, none, function, custom. Default is 'all'. 2044 2045.. option:: -fxray-link-deps 2046 2047Tells clang to add the link dependencies for XRay. 2048 2049.. option:: -fxray-modes=<arg> 2050 2051List of modes to link in by default into XRay instrumented binaries. 2052 2053.. option:: -fxray-never-instrument=<arg> 2054 2055DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2056 2057.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2058 2059.. option:: -fzvector, -fno-zvector, -mzvector 2060 2061Enable System z vector language extension 2062 2063.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2064 2065.. option:: -pedantic-errors, --pedantic-errors 2066 2067OpenCL flags 2068------------ 2069.. option:: -cl-denorms-are-zero 2070 2071OpenCL only. Allow denormals to be flushed to zero. 2072 2073.. option:: -cl-fast-relaxed-math 2074 2075OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2076 2077.. option:: -cl-finite-math-only 2078 2079OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2080 2081.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2082 2083OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2084 2085.. option:: -cl-kernel-arg-info 2086 2087OpenCL only. Generate kernel argument metadata. 2088 2089.. option:: -cl-mad-enable 2090 2091OpenCL only. Allow use of less precise MAD computations in the generated binary. 2092 2093.. option:: -cl-no-signed-zeros 2094 2095OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2096 2097.. option:: -cl-opt-disable 2098 2099OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2100 2101.. option:: -cl-single-precision-constant 2102 2103OpenCL only. Treat double precision floating-point constant as single precision constant. 2104 2105.. option:: -cl-std=<arg> 2106 2107OpenCL language standard to compile for. 2108 2109.. option:: -cl-strict-aliasing 2110 2111OpenCL only. This option is added for compatibility with OpenCL 1.0. 2112 2113.. option:: -cl-uniform-work-group-size 2114 2115OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2116 2117.. option:: -cl-unsafe-math-optimizations 2118 2119OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2120 2121Target-dependent compilation options 2122~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2123.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg> 2124 2125Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2126 2127.. option:: -m16 2128 2129.. option:: -m32 2130 2131.. option:: -m64 2132 2133.. option:: -mabi=<arg> 2134 2135.. option:: -malign-double 2136 2137Align doubles to two words in structs (x86 only) 2138 2139.. option:: -march=<arg> 2140 2141.. option:: -masm=<arg> 2142 2143.. option:: -mbackchain, -mno-backchain 2144 2145Link stack frames through backchain on System Z 2146 2147.. option:: -mcmodel=<arg> 2148 2149.. option:: -mconsole<arg> 2150 2151.. 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) 2152 2153.. option:: -mcrc, -mno-crc 2154 2155Allow use of CRC instructions (ARM/Mips only) 2156 2157.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2158 2159.. option:: -mdll<arg> 2160 2161.. option:: -mdynamic-no-pic<arg> 2162 2163.. option:: -meabi <arg> 2164 2165Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2166 2167.. option:: -mfentry 2168 2169Insert calls to fentry at function entry (x86 only) 2170 2171.. option:: -mfloat-abi=<arg> 2172 2173.. option:: -mfpmath=<arg> 2174 2175.. option:: -mfpu=<arg> 2176 2177.. option:: -mglobal-merge, -mno-global-merge 2178 2179Enable merging of globals 2180 2181.. option:: -mhard-float 2182 2183.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2184 2185.. option:: -miamcu, -mno-iamcu 2186 2187Use Intel MCU ABI 2188 2189.. option:: -mimplicit-float, -mno-implicit-float 2190 2191.. option:: -mimplicit-it=<arg> 2192 2193.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2194 2195(integrated-as) Emit an object file which can be used with an incremental linker 2196 2197.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2198 2199.. option:: -mkernel 2200 2201.. option:: -mlong-calls, -mno-long-calls 2202 2203Generate branches with extended addressability, usually via indirect jumps. 2204 2205.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2206 2207Set Mac OS X deployment target 2208 2209.. option:: -mmcu=<arg> 2210 2211.. option:: -mms-bitfields, -mno-ms-bitfields 2212 2213Set the default structure layout to be compatible with the Microsoft compiler standard 2214 2215.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2216 2217Omit frame pointer setup for leaf functions 2218 2219.. option:: -moslib=<arg> 2220 2221.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2222 2223Use copy relocations support for PIE builds 2224 2225.. option:: -mprefer-vector-width=<arg> 2226 2227Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2228 2229.. option:: -mqdsp6-compat 2230 2231Enable hexagon-qdsp6 backward compatibility 2232 2233.. option:: -mrecip 2234 2235.. program:: clang1 2236.. option:: -mrecip=<arg1>,<arg2>... 2237.. program:: clang 2238 2239.. option:: -mred-zone, -mno-red-zone 2240 2241.. option:: -mregparm=<arg> 2242 2243.. option:: -mrelax-all, -mno-relax-all 2244 2245(integrated-as) Relax all machine instructions 2246 2247.. option:: -mretpoline, -mno-retpoline 2248 2249.. option:: -mrtd, -mno-rtd 2250 2251Make StdCall calling convention the default 2252 2253.. option:: -msign-return-address=<arg> 2254 2255Select return address signing scope 2256 2257.. option:: -msoft-float, -mno-soft-float 2258 2259Use software floating point 2260 2261.. option:: -mstack-alignment=<arg> 2262 2263Set the stack alignment 2264 2265.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2266 2267Enable stack probes 2268 2269.. option:: -mstack-probe-size=<arg> 2270 2271Set the stack probe size 2272 2273.. option:: -mstackrealign, -mno-stackrealign 2274 2275Force realign the stack at entry to every function 2276 2277.. option:: -mthread-model <arg> 2278 2279The thread model to use, e.g. posix, single (posix by default) 2280 2281.. option:: -mthreads<arg> 2282 2283.. option:: -mthumb, -mno-thumb 2284 2285.. option:: -mtune=<arg> 2286 2287.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2288 2289.. option:: -municode<arg> 2290 2291.. option:: -mvx, -mno-vx 2292 2293.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2294 2295.. option:: -mwatchos-version-min=<arg> 2296 2297.. option:: -mwindows<arg> 2298 2299.. option:: -mx32 2300 2301AARCH64 2302------- 2303.. option:: -ffixed-x1 2304 2305Reserve the x1 register (AArch64 only) 2306 2307.. option:: -ffixed-x2 2308 2309Reserve the x2 register (AArch64 only) 2310 2311.. option:: -ffixed-x3 2312 2313Reserve the x3 register (AArch64 only) 2314 2315.. option:: -ffixed-x4 2316 2317Reserve the x4 register (AArch64 only) 2318 2319.. option:: -ffixed-x5 2320 2321Reserve the x5 register (AArch64 only) 2322 2323.. option:: -ffixed-x6 2324 2325Reserve the x6 register (AArch64 only) 2326 2327.. option:: -ffixed-x7 2328 2329Reserve the x7 register (AArch64 only) 2330 2331.. option:: -ffixed-x18 2332 2333Reserve the x18 register (AArch64 only) 2334 2335.. option:: -ffixed-x20 2336 2337Reserve the x20 register (AArch64 only) 2338 2339.. option:: -fcall-saved-x8 2340 2341Make the x8 register call-saved (AArch64 only) 2342 2343.. option:: -fcall-saved-x9 2344 2345Make the x9 register call-saved (AArch64 only) 2346 2347.. option:: -fcall-saved-x10 2348 2349Make the x10 register call-saved (AArch64 only) 2350 2351.. option:: -fcall-saved-x11 2352 2353Make the x11 register call-saved (AArch64 only) 2354 2355.. option:: -fcall-saved-x12 2356 2357Make the x12 register call-saved (AArch64 only) 2358 2359.. option:: -fcall-saved-x13 2360 2361Make the x13 register call-saved (AArch64 only) 2362 2363.. option:: -fcall-saved-x14 2364 2365Make the x14 register call-saved (AArch64 only) 2366 2367.. option:: -fcall-saved-x15 2368 2369Make the x15 register call-saved (AArch64 only) 2370 2371.. option:: -fcall-saved-x18 2372 2373Make the x18 register call-saved (AArch64 only) 2374 2375.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2376 2377Workaround Cortex-A53 erratum 835769 (AArch64 only) 2378 2379.. option:: -mgeneral-regs-only 2380 2381Generate code which only uses the general purpose registers (AArch64 only) 2382 2383AMDGPU 2384------ 2385.. option:: -mxnack, -mno-xnack 2386 2387Enable XNACK (AMDGPU only) 2388 2389ARM 2390--- 2391.. option:: -ffixed-r9 2392 2393Reserve the r9 register (ARM only) 2394 2395.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2396 2397Disallow generation of data access to code sections (ARM only) 2398 2399.. option:: -mno-movt 2400 2401Disallow use of movt/movw pairs (ARM only) 2402 2403.. option:: -mno-neg-immediates 2404 2405Disallow converting instructions with negative immediates to their negation or inversion. 2406 2407.. option:: -mnocrc 2408 2409Disallow use of CRC instructions (ARM only) 2410 2411.. option:: -mrestrict-it, -mno-restrict-it 2412 2413Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2414 2415.. option:: -mtp=<arg> 2416 2417Read thread pointer from coprocessor register (ARM only) 2418 2419.. option:: -munaligned-access, -mno-unaligned-access 2420 2421Allow memory accesses to be unaligned (AArch32/AArch64 only) 2422 2423Hexagon 2424------- 2425.. option:: -mieee-rnd-near 2426 2427.. option:: -mmemops, -mno-memops 2428 2429Enable generation of memop instructions 2430 2431.. option:: -mnvj, -mno-nvj 2432 2433Enable generation of new-value jumps 2434 2435.. option:: -mnvs, -mno-nvs 2436 2437Enable generation of new-value stores 2438 2439.. option:: -mpackets, -mno-packets 2440 2441Enable generation of instruction packets 2442 2443Hexagon 2444------- 2445.. option:: -mhvx, -mno-hvx 2446 2447Enable Hexagon Vector eXtensions 2448 2449.. option:: -mhvx-length=<arg> 2450 2451Set Hexagon Vector Length 2452 2453.. program:: clang1 2454.. option:: -mhvx=<arg> 2455.. program:: clang 2456 2457Enable Hexagon Vector eXtensions 2458 2459MIPS 2460---- 2461.. option:: -mabicalls, -mno-abicalls 2462 2463Enable SVR4-style position-independent code (Mips only) 2464 2465.. option:: -mabs=<arg> 2466 2467.. option:: -mcheck-zero-division, -mno-check-zero-division 2468 2469.. option:: -mcompact-branches=<arg> 2470 2471.. option:: -mdouble-float 2472 2473.. option:: -mdsp, -mno-dsp 2474 2475.. option:: -mdspr2, -mno-dspr2 2476 2477.. option:: -membedded-data, -mno-embedded-data 2478 2479Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 2480 2481.. option:: -mextern-sdata, -mno-extern-sdata 2482 2483Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 2484 2485.. option:: -mfp32 2486 2487Use 32-bit floating point registers (MIPS only) 2488 2489.. option:: -mfp64 2490 2491Use 64-bit floating point registers (MIPS only) 2492 2493.. option:: -mginv, -mno-ginv 2494 2495.. option:: -mgpopt, -mno-gpopt 2496 2497Use GP relative accesses for symbols known to be in a small data section (MIPS) 2498 2499.. option:: -mindirect-jump=<arg> 2500 2501Change indirect jump instructions to inhibit speculation 2502 2503.. option:: -mips16 2504 2505.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 2506 2507.. option:: -mlocal-sdata, -mno-local-sdata 2508 2509Extend the -G behaviour to object local data (MIPS) 2510 2511.. option:: -mmadd4, -mno-madd4 2512 2513Enable the generation of 4-operand madd.s, madd.d and related instructions. 2514 2515.. option:: -mmicromips, -mno-micromips 2516 2517.. option:: -mmsa, -mno-msa 2518 2519Enable MSA ASE (MIPS only) 2520 2521.. option:: -mmt, -mno-mt 2522 2523Enable MT ASE (MIPS only) 2524 2525.. option:: -mnan=<arg> 2526 2527.. option:: -mno-mips16 2528 2529.. option:: -msingle-float 2530 2531.. option:: -mvirt, -mno-virt 2532 2533.. option:: -mxgot, -mno-xgot 2534 2535PowerPC 2536------- 2537.. option:: -maltivec, -mno-altivec 2538 2539.. option:: -mcmpb, -mno-cmpb 2540 2541.. option:: -mcrbits, -mno-crbits 2542 2543.. option:: -mcrypto, -mno-crypto 2544 2545.. option:: -mdirect-move, -mno-direct-move 2546 2547.. option:: -mfloat128, -mno-float128 2548 2549.. option:: -mfprnd, -mno-fprnd 2550 2551.. option:: -mhtm, -mno-htm 2552 2553.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 2554 2555.. option:: -misel, -mno-isel 2556 2557.. option:: -mlongcall, -mno-longcall 2558 2559.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 2560 2561.. option:: -mpopcntd, -mno-popcntd 2562 2563.. option:: -mpower8-vector, -mno-power8-vector 2564 2565.. option:: -mpower9-vector, -mno-power9-vector 2566 2567.. option:: -mqpx, -mno-qpx 2568 2569.. option:: -msecure-plt 2570 2571.. option:: -mvsx, -mno-vsx 2572 2573WebAssembly 2574----------- 2575.. option:: -mexception-handling, -mno-exception-handling 2576 2577.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 2578 2579.. option:: -msign-ext, -mno-sign-ext 2580 2581.. option:: -msimd128, -mno-simd128 2582 2583X86 2584--- 2585.. option:: -m3dnow, -mno-3dnow 2586 2587.. option:: -m3dnowa, -mno-3dnowa 2588 2589.. option:: -madx, -mno-adx 2590 2591.. option:: -maes, -mno-aes 2592 2593.. option:: -mavx, -mno-avx 2594 2595.. option:: -mavx2, -mno-avx2 2596 2597.. option:: -mavx512bitalg, -mno-avx512bitalg 2598 2599.. option:: -mavx512bw, -mno-avx512bw 2600 2601.. option:: -mavx512cd, -mno-avx512cd 2602 2603.. option:: -mavx512dq, -mno-avx512dq 2604 2605.. option:: -mavx512er, -mno-avx512er 2606 2607.. option:: -mavx512f, -mno-avx512f 2608 2609.. option:: -mavx512ifma, -mno-avx512ifma 2610 2611.. option:: -mavx512pf, -mno-avx512pf 2612 2613.. option:: -mavx512vbmi, -mno-avx512vbmi 2614 2615.. option:: -mavx512vbmi2, -mno-avx512vbmi2 2616 2617.. option:: -mavx512vl, -mno-avx512vl 2618 2619.. option:: -mavx512vnni, -mno-avx512vnni 2620 2621.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 2622 2623.. option:: -mbmi, -mno-bmi 2624 2625.. option:: -mbmi2, -mno-bmi2 2626 2627.. option:: -mcldemote, -mno-cldemote 2628 2629.. option:: -mclflushopt, -mno-clflushopt 2630 2631.. option:: -mclwb, -mno-clwb 2632 2633.. option:: -mclzero, -mno-clzero 2634 2635.. option:: -mcx16, -mno-cx16 2636 2637.. option:: -mf16c, -mno-f16c 2638 2639.. option:: -mfma, -mno-fma 2640 2641.. option:: -mfma4, -mno-fma4 2642 2643.. option:: -mfsgsbase, -mno-fsgsbase 2644 2645.. option:: -mfxsr, -mno-fxsr 2646 2647.. option:: -mgfni, -mno-gfni 2648 2649.. option:: -minvpcid, -mno-invpcid 2650 2651.. option:: -mlwp, -mno-lwp 2652 2653.. option:: -mlzcnt, -mno-lzcnt 2654 2655.. option:: -mmmx, -mno-mmx 2656 2657.. option:: -mmovbe, -mno-movbe 2658 2659.. option:: -mmovdir64b, -mno-movdir64b 2660 2661.. option:: -mmovdiri, -mno-movdiri 2662 2663.. option:: -mmpx, -mno-mpx 2664 2665.. option:: -mmwaitx, -mno-mwaitx 2666 2667.. option:: -mpclmul, -mno-pclmul 2668 2669.. option:: -mpconfig, -mno-pconfig 2670 2671.. option:: -mpku, -mno-pku 2672 2673.. option:: -mpopcnt, -mno-popcnt 2674 2675.. option:: -mprefetchwt1, -mno-prefetchwt1 2676 2677.. option:: -mprfchw, -mno-prfchw 2678 2679.. option:: -mptwrite, -mno-ptwrite 2680 2681.. option:: -mrdpid, -mno-rdpid 2682 2683.. option:: -mrdrnd, -mno-rdrnd 2684 2685.. option:: -mrdseed, -mno-rdseed 2686 2687.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 2688 2689.. option:: -mrtm, -mno-rtm 2690 2691.. option:: -msahf, -mno-sahf 2692 2693.. option:: -msgx, -mno-sgx 2694 2695.. option:: -msha, -mno-sha 2696 2697.. option:: -mshstk, -mno-shstk 2698 2699.. option:: -msse, -mno-sse 2700 2701.. option:: -msse2, -mno-sse2 2702 2703.. option:: -msse3, -mno-sse3 2704 2705.. option:: -msse4.1, -mno-sse4.1 2706 2707.. program:: clang1 2708.. option:: -msse4.2, -mno-sse4.2, -msse4 2709.. program:: clang 2710 2711.. option:: -msse4a, -mno-sse4a 2712 2713.. option:: -mssse3, -mno-ssse3 2714 2715.. option:: -mtbm, -mno-tbm 2716 2717.. option:: -mvaes, -mno-vaes 2718 2719.. option:: -mvpclmulqdq, -mno-vpclmulqdq 2720 2721.. option:: -mwaitpkg, -mno-waitpkg 2722 2723.. option:: -mwbnoinvd, -mno-wbnoinvd 2724 2725.. option:: -mx87, -m80387, -mno-x87 2726 2727.. option:: -mxop, -mno-xop 2728 2729.. option:: -mxsave, -mno-xsave 2730 2731.. option:: -mxsavec, -mno-xsavec 2732 2733.. option:: -mxsaveopt, -mno-xsaveopt 2734 2735.. option:: -mxsaves, -mno-xsaves 2736 2737RISCV 2738----- 2739.. option:: -mrelax, -mno-relax 2740 2741Enable linker relaxation 2742 2743Optimization level 2744~~~~~~~~~~~~~~~~~~ 2745 2746Flags controlling how much optimization should be performed. 2747 2748.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg> 2749 2750.. option:: -Ofast<arg> 2751 2752Debug information generation 2753~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2754 2755Flags controlling how much and what kind of debug information should be 2756generated. 2757 2758Kind and level of debug information 2759----------------------------------- 2760.. option:: -g, --debug, --debug=<arg> 2761 2762Generate source-level debug information 2763 2764.. option:: -gdwarf-2 2765 2766Generate source-level debug information with dwarf version 2 2767 2768.. option:: -gdwarf-3 2769 2770Generate source-level debug information with dwarf version 3 2771 2772.. option:: -gdwarf-4, -gdwarf 2773 2774Generate source-level debug information with dwarf version 4 2775 2776.. option:: -gdwarf-5 2777 2778Generate source-level debug information with dwarf version 5 2779 2780.. option:: -gfull 2781 2782.. option:: -gused 2783 2784Debug level 2785___________ 2786.. option:: -g0 2787 2788.. option:: -g2 2789 2790.. option:: -g3 2791 2792.. option:: -ggdb0 2793 2794.. option:: -ggdb1 2795 2796.. option:: -ggdb2 2797 2798.. option:: -ggdb3 2799 2800.. option:: -gline-tables-only, -g1, -gmlt 2801 2802Emit debug line number tables only 2803 2804.. option:: -gmodules 2805 2806Generate debug info with external references to clang modules or precompiled headers 2807 2808Debugger to tune debug information for 2809______________________________________ 2810.. option:: -ggdb 2811 2812.. option:: -glldb 2813 2814.. option:: -gsce 2815 2816Debug information flags 2817----------------------- 2818.. option:: -gcolumn-info, -gno-column-info 2819 2820.. option:: -gdwarf-aranges 2821 2822.. option:: -gembed-source, -gno-embed-source 2823 2824Embed source text in DWARF debug sections 2825 2826.. option:: -ggnu-pubnames, -gno-gnu-pubnames 2827 2828.. option:: -gpubnames, -gno-pubnames 2829 2830.. option:: -grecord-gcc-switches, -gno-record-gcc-switches 2831 2832.. option:: -gsplit-dwarf 2833 2834.. option:: -gstrict-dwarf, -gno-strict-dwarf 2835 2836.. option:: -gz 2837 2838DWARF debug sections compression type 2839 2840.. program:: clang1 2841.. option:: -gz=<arg> 2842.. program:: clang 2843 2844DWARF debug sections compression type 2845 2846Static analyzer flags 2847===================== 2848 2849Flags controlling the behavior of the Clang Static Analyzer. 2850 2851.. option:: -Xanalyzer <arg> 2852 2853Pass <arg> to the static analyzer 2854 2855Fortran compilation flags 2856========================= 2857 2858Flags that will be passed onto the ``gfortran`` compiler when Clang is given 2859a Fortran input. 2860 2861.. option:: -A<arg>, --assert <arg>, --assert=<arg> 2862 2863.. option:: -A-<arg> 2864 2865.. option:: -J<arg> 2866 2867.. option:: -cpp 2868 2869.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 2870 2871.. option:: -falign-commons, -fno-align-commons 2872 2873.. option:: -fall-intrinsics, -fno-all-intrinsics 2874 2875.. option:: -fautomatic, -fno-automatic 2876 2877.. option:: -fbackslash, -fno-backslash 2878 2879.. option:: -fbacktrace, -fno-backtrace 2880 2881.. option:: -fblas-matmul-limit=<arg> 2882 2883.. option:: -fbounds-check, -fno-bounds-check 2884 2885.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 2886 2887.. option:: -fcheck=<arg> 2888 2889.. option:: -fcoarray=<arg> 2890 2891.. option:: -fconvert=<arg> 2892 2893.. option:: -fcray-pointer, -fno-cray-pointer 2894 2895.. option:: -fd-lines-as-code, -fno-d-lines-as-code 2896 2897.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 2898 2899.. option:: -fdefault-double-8, -fno-default-double-8 2900 2901.. option:: -fdefault-integer-8, -fno-default-integer-8 2902 2903.. option:: -fdefault-real-8, -fno-default-real-8 2904 2905.. option:: -fdollar-ok, -fno-dollar-ok 2906 2907.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 2908 2909.. option:: -fdump-fortran-original, -fno-dump-fortran-original 2910 2911.. option:: -fdump-parse-tree, -fno-dump-parse-tree 2912 2913.. option:: -fexternal-blas, -fno-external-blas 2914 2915.. option:: -ff2c, -fno-f2c 2916 2917.. option:: -ffixed-form, -fno-fixed-form 2918 2919.. option:: -ffixed-line-length-<arg> 2920 2921.. option:: -ffpe-trap=<arg> 2922 2923.. option:: -ffree-form, -fno-free-form 2924 2925.. option:: -ffree-line-length-<arg> 2926 2927.. option:: -ffrontend-optimize, -fno-frontend-optimize 2928 2929.. option:: -fimplicit-none, -fno-implicit-none 2930 2931.. option:: -finit-character=<arg> 2932 2933.. option:: -finit-integer=<arg> 2934 2935.. option:: -finit-local-zero, -fno-init-local-zero 2936 2937.. option:: -finit-logical=<arg> 2938 2939.. option:: -finit-real=<arg> 2940 2941.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 2942 2943.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 2944 2945.. option:: -fmax-array-constructor=<arg> 2946 2947.. option:: -fmax-errors=<arg> 2948 2949.. option:: -fmax-identifier-length, -fno-max-identifier-length 2950 2951.. option:: -fmax-stack-var-size=<arg> 2952 2953.. option:: -fmax-subrecord-length=<arg> 2954 2955.. option:: -fmodule-private, -fno-module-private 2956 2957.. option:: -fpack-derived, -fno-pack-derived 2958 2959.. option:: -fprotect-parens, -fno-protect-parens 2960 2961.. option:: -frange-check, -fno-range-check 2962 2963.. option:: -freal-4-real-10, -fno-real-4-real-10 2964 2965.. option:: -freal-4-real-16, -fno-real-4-real-16 2966 2967.. option:: -freal-4-real-8, -fno-real-4-real-8 2968 2969.. option:: -freal-8-real-10, -fno-real-8-real-10 2970 2971.. option:: -freal-8-real-16, -fno-real-8-real-16 2972 2973.. option:: -freal-8-real-4, -fno-real-8-real-4 2974 2975.. option:: -frealloc-lhs, -fno-realloc-lhs 2976 2977.. option:: -frecord-marker=<arg> 2978 2979.. option:: -frecursive, -fno-recursive 2980 2981.. option:: -frepack-arrays, -fno-repack-arrays 2982 2983.. option:: -fsecond-underscore, -fno-second-underscore 2984 2985.. option:: -fsign-zero, -fno-sign-zero 2986 2987.. option:: -fstack-arrays, -fno-stack-arrays 2988 2989.. option:: -funderscoring, -fno-underscoring 2990 2991.. option:: -fwhole-file, -fno-whole-file 2992 2993.. option:: -imultilib <arg> 2994 2995.. option:: -nocpp 2996 2997.. option:: -static-libgfortran 2998 2999Linker flags 3000============ 3001Flags that are passed on to the linker 3002 3003.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3004 3005Add directory to library search path 3006 3007.. option:: -Mach 3008 3009.. option:: -T<script> 3010 3011Specify <script> as linker script 3012 3013.. option:: -Tbss<addr> 3014 3015Set starting address of BSS to <addr> 3016 3017.. option:: -Tdata<addr> 3018 3019Set starting address of DATA to <addr> 3020 3021.. option:: -Ttext<addr> 3022 3023Set starting address of TEXT to <addr> 3024 3025.. option:: -Wl,<arg>,<arg2>... 3026 3027Pass the comma separated arguments in <arg> to the linker 3028 3029.. option:: -X 3030 3031.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3032 3033Pass <arg> to the linker 3034 3035.. program:: clang1 3036.. option:: -Z 3037.. program:: clang 3038 3039.. option:: -e<arg>, --entry 3040 3041.. option:: -filelist <arg> 3042 3043.. option:: --hip-device-lib-path=<arg> 3044 3045HIP device library path 3046 3047.. option:: --hip-device-lib=<arg> 3048 3049HIP device library 3050 3051.. option:: -l<arg> 3052 3053.. option:: -r 3054 3055.. option:: -rpath <arg> 3056 3057.. option:: -s 3058 3059.. option:: -t 3060 3061.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3062 3063.. option:: -undef 3064 3065undef all system defines 3066 3067.. option:: -undefined<arg>, --no-undefined 3068 3069.. option:: -z <arg> 3070 3071Pass -z <arg> to the linker 3072 3073