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-class-member-array-new-cookie, -fno-sanitize-address-poison-class-member-array-new-cookie 804 805Enable poisoning array cookies when using class member operator new\[\] in AddressSanitizer 806 807.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 808 809Enable use-after-scope detection in AddressSanitizer 810 811.. option:: -fsanitize-blacklist=<arg> 812 813Path to blacklist file for sanitizers 814 815.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 816 817Enable control flow integrity (CFI) checks for cross-DSO calls. 818 819.. option:: -fsanitize-cfi-icall-generalize-pointers 820 821Generalize pointers in CFI indirect call type signature checks 822 823.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 824 825Specify the type of coverage instrumentation for Sanitizers 826 827.. option:: -fsanitize-link-c++-runtime 828 829.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 830 831Enable origins tracking in MemorySanitizer 832 833.. program:: clang1 834.. option:: -fsanitize-memory-track-origins=<arg> 835.. program:: clang 836 837Enable origins tracking in MemorySanitizer 838 839.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 840 841Enable use-after-destroy detection in MemorySanitizer 842 843.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 844 845.. option:: -fsanitize-recover, -fno-sanitize-recover 846 847.. program:: clang1 848.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>... 849.. program:: clang 850 851Enable recovery for specified sanitizers 852 853.. option:: -fsanitize-stats, -fno-sanitize-stats 854 855Enable sanitizer statistics gathering. 856 857.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 858 859Enable atomic operations instrumentation in ThreadSanitizer (default) 860 861.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 862 863Enable function entry/exit instrumentation in ThreadSanitizer (default) 864 865.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 866 867Enable memory access instrumentation in ThreadSanitizer (default) 868 869.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>... 870 871Enable trapping for specified sanitizers 872 873.. option:: -fsanitize-undefined-strip-path-components=<number> 874 875Strip (or keep only, if negative) a given number of path components when emitting check metadata. 876 877.. option:: -fsanitize-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error 878 879.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 880 881Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 882 883.. option:: -moutline, -mno-outline 884 885Enable function outlining (AArch64 only) 886 887.. option:: --param <arg>, --param=<arg> 888 889.. option:: -std=<arg>, --std=<arg>, --std <arg> 890 891Language standard to compile for 892 893Preprocessor flags 894~~~~~~~~~~~~~~~~~~ 895 896Flags controlling the behavior of the Clang preprocessor. 897 898.. option:: -C, --comments 899 900Include comments in preprocessed output 901 902.. option:: -CC, --comments-in-macros 903 904Include comments from within macros in preprocessed output 905 906.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 907 908Define <macro> to <value> (or 1 if <value> omitted) 909 910.. option:: -H, --trace-includes 911 912Show header includes and nesting depth 913 914.. option:: -P, --no-line-commands 915 916Disable linemarker output in -E mode 917 918.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 919 920Undefine macro <macro> 921 922.. option:: -Wp,<arg>,<arg2>... 923 924Pass the comma separated arguments in <arg> to the preprocessor 925 926.. option:: -Xpreprocessor <arg> 927 928Pass <arg> to the preprocessor 929 930Include path management 931----------------------- 932 933Flags controlling how ``#include``\s are resolved to files. 934 935.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 936 937Add directory to include search path 938 939.. option:: -I-, --include-barrier 940 941Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 942 943.. option:: --cuda-path-ignore-env 944 945Ignore environment variables to detect CUDA installation 946 947.. option:: --cuda-path=<arg> 948 949CUDA installation path 950 951.. option:: -cxx-isystem<directory> 952 953Add directory to the C++ SYSTEM include search path 954 955.. option:: -fbuild-session-file=<file> 956 957Use the last modification time of <file> as the build session timestamp 958 959.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 960 961Time when the current build session started 962 963.. option:: -fmodule-file=\[<name>=\]<file> 964 965Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 966 967.. option:: -fmodules-cache-path=<directory> 968 969Specify the module cache path 970 971.. option:: -fmodules-disable-diagnostic-validation 972 973Disable validation of the diagnostic options when loading the module 974 975.. option:: -fmodules-prune-after=<seconds> 976 977Specify the interval (in seconds) after which a module file will be considered unused 978 979.. option:: -fmodules-prune-interval=<seconds> 980 981Specify the interval (in seconds) between attempts to prune the module cache 982 983.. option:: -fmodules-user-build-path <directory> 984 985Specify the module user build path 986 987.. option:: -fmodules-validate-once-per-build-session 988 989Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 990 991.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 992 993Validate the system headers that a module depends on when loading the module 994 995.. option:: -fprebuilt-module-path=<directory> 996 997Specify the prebuilt module path 998 999.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1000 1001Add directory to AFTER include search path 1002 1003.. option:: -iframework<arg> 1004 1005Add directory to SYSTEM framework search path 1006 1007.. option:: -iframeworkwithsysroot<directory> 1008 1009Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1010 1011.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1012 1013Include macros from file before parsing 1014 1015.. option:: -include<file>, --include<file>, --include=<arg> 1016 1017Include file before parsing 1018 1019.. option:: -include-pch <file> 1020 1021Include precompiled header file 1022 1023.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1024 1025Set the -iwithprefix/-iwithprefixbefore prefix 1026 1027.. option:: -iquote<directory> 1028 1029Add directory to QUOTE include search path 1030 1031.. option:: -isysroot<dir> 1032 1033Set the system root directory (usually /) 1034 1035.. option:: -isystem<directory> 1036 1037Add directory to SYSTEM include search path 1038 1039.. option:: -isystem-after<directory> 1040 1041Add directory to end of the SYSTEM include search path 1042 1043.. option:: -ivfsoverlay<arg> 1044 1045Overlay the virtual filesystem described by file over the real file system 1046 1047.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1048 1049Set directory to SYSTEM include search path with prefix 1050 1051.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1052 1053Set directory to include search path with prefix 1054 1055.. option:: -iwithsysroot<directory> 1056 1057Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1058 1059.. option:: --ptxas-path=<arg> 1060 1061Path to ptxas (used for compiling CUDA code) 1062 1063.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1064 1065Treat all #include paths starting with <prefix> as including a system header. 1066 1067Dependency file generation 1068-------------------------- 1069 1070Flags controlling generation of a dependency file for ``make``-like build 1071systems. 1072 1073.. option:: -M, --dependencies 1074 1075Like -MD, but also implies -E and writes to stdout by default 1076 1077.. option:: -MD, --write-dependencies 1078 1079Write a depfile containing user and system headers 1080 1081.. option:: -MF<file> 1082 1083Write depfile output from -MMD, -MD, -MM, or -M to <file> 1084 1085.. option:: -MG, --print-missing-file-dependencies 1086 1087Add missing headers to depfile 1088 1089.. option:: -MJ<arg> 1090 1091Write a compilation database entry per input 1092 1093.. option:: -MM, --user-dependencies 1094 1095Like -MMD, but also implies -E and writes to stdout by default 1096 1097.. option:: -MMD, --write-user-dependencies 1098 1099Write a depfile containing user headers 1100 1101.. option:: -MP 1102 1103Create phony target for each dependency (other than main file) 1104 1105.. option:: -MQ<arg> 1106 1107Specify name of main file output to quote in depfile 1108 1109.. option:: -MT<arg> 1110 1111Specify name of main file output in depfile 1112 1113.. option:: -MV 1114 1115Use NMake/Jom format for the depfile 1116 1117Dumping preprocessor state 1118-------------------------- 1119 1120Flags allowing the state of the preprocessor to be dumped in various ways. 1121 1122.. option:: -d 1123 1124.. program:: clang1 1125.. option:: -d<arg> 1126.. program:: clang 1127 1128.. option:: -dA 1129 1130.. option:: -dD 1131 1132Print macro definitions in -E mode in addition to normal output 1133 1134.. option:: -dI 1135 1136Print include directives in -E mode in addition to normal output 1137 1138.. option:: -dM 1139 1140Print macro definitions in -E mode instead of normal output 1141 1142Diagnostic flags 1143~~~~~~~~~~~~~~~~ 1144 1145Flags controlling which warnings, errors, and remarks Clang will generate. 1146See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1147 1148.. option:: -R<remark> 1149 1150Enable the specified remark 1151 1152.. option:: -Rpass-analysis=<arg> 1153 1154Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1155 1156.. option:: -Rpass-missed=<arg> 1157 1158Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1159 1160.. option:: -Rpass=<arg> 1161 1162Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1163 1164.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1165 1166Enable the specified warning 1167 1168.. option:: -Wdeprecated, -Wno-deprecated 1169 1170Enable warnings for deprecated constructs and define \_\_DEPRECATED 1171 1172.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1173 1174Target-independent compilation options 1175~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1176.. option:: -Wframe-larger-than=<arg> 1177 1178.. option:: -fPIC, -fno-PIC 1179 1180.. option:: -fPIE, -fno-PIE 1181 1182.. option:: -faccess-control, -fno-access-control 1183 1184.. option:: -faddrsig, -fno-addrsig 1185 1186Emit an address-significance table 1187 1188.. option:: -falign-functions, -fno-align-functions 1189 1190.. program:: clang1 1191.. option:: -falign-functions=<arg> 1192.. program:: clang 1193 1194.. program:: clang1 1195.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1196.. program:: clang 1197 1198Enable C++17 aligned allocation functions 1199 1200.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1201 1202Treat editor placeholders as valid source code 1203 1204.. option:: -fallow-unsupported 1205 1206.. option:: -faltivec, -fno-altivec 1207 1208.. option:: -fansi-escape-codes 1209 1210Use ANSI escape codes for diagnostics 1211 1212.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1213 1214Use Apple's kernel extensions ABI 1215 1216.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1217 1218Enable Apple gcc-compatible #pragma pack handling 1219 1220.. option:: -fapplication-extension, -fno-application-extension 1221 1222Restrict code to those available for App Extensions 1223 1224.. option:: -fasm, -fno-asm 1225 1226.. option:: -fasm-blocks, -fno-asm-blocks 1227 1228.. option:: -fassociative-math, -fno-associative-math 1229 1230.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1231 1232.. option:: -fast 1233 1234.. option:: -fastcp 1235 1236.. option:: -fastf 1237 1238.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1239 1240.. option:: -fautolink, -fno-autolink 1241 1242.. option:: -fblocks, -fno-blocks 1243 1244Enable the 'blocks' language feature 1245 1246.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1247 1248.. option:: -fborland-extensions, -fno-borland-extensions 1249 1250Accept non-standard constructs supported by the Borland compiler 1251 1252.. option:: -fbracket-depth=<arg> 1253 1254.. option:: -fbuiltin, -fno-builtin 1255 1256.. option:: -fbuiltin-module-map 1257 1258Load the clang builtins module map file. 1259 1260.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1261 1262Enable C++ static destructor registration (the default) 1263 1264.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1265 1266.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1267 1268Instrument control-flow architecture protection. Options: return, branch, full, none. 1269 1270.. option:: -fchar8\_t, -fno-char8\_t 1271 1272Enable C++ builtin type char8\_t 1273 1274.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1275 1276.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1277 1278Use colors in diagnostics 1279 1280.. option:: -fcommon, -fno-common 1281 1282.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1283 1284.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1285 1286.. option:: -fconstant-string-class=<arg> 1287 1288.. option:: -fconstexpr-backtrace-limit=<arg> 1289 1290.. option:: -fconstexpr-depth=<arg> 1291 1292.. option:: -fconstexpr-steps=<arg> 1293 1294.. option:: -fcoroutines-ts, -fno-coroutines-ts 1295 1296Enable support for the C++ Coroutines TS 1297 1298.. option:: -fcoverage-mapping, -fno-coverage-mapping 1299 1300Generate coverage mapping to enable code coverage analysis 1301 1302.. option:: -fcreate-profile 1303 1304.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1305 1306Enable C++ exceptions 1307 1308.. option:: -fcxx-modules, -fno-cxx-modules 1309 1310.. option:: -fdata-sections, -fno-data-sections 1311 1312Place each data in its own section (ELF Only) 1313 1314.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1315 1316Emit extra debug info to make sample profile more accurate. 1317 1318.. option:: -fdebug-macro, -fno-debug-macro 1319 1320Emit macro debug information 1321 1322.. option:: -fdebug-pass-arguments 1323 1324.. option:: -fdebug-pass-structure 1325 1326.. option:: -fdebug-prefix-map=<arg> 1327 1328remap file source paths in debug info 1329 1330.. option:: -fdebug-types-section, -fno-debug-types-section 1331 1332Place debug types in their own section (ELF Only) 1333 1334.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1335 1336Parse templated function definitions at the end of the translation unit 1337 1338.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1339 1340Treat usage of null pointers as undefined behavior. 1341 1342.. option:: -fdenormal-fp-math=<arg> 1343 1344.. option:: -fdiagnostics-absolute-paths 1345 1346Print absolute paths in diagnostics 1347 1348.. option:: -fdiagnostics-color, -fno-diagnostics-color 1349 1350.. program:: clang1 1351.. option:: -fdiagnostics-color=<arg> 1352.. program:: clang 1353 1354.. option:: -fdiagnostics-hotness-threshold=<number> 1355 1356Prevent optimization remarks from being output if they do not have at least this profile count 1357 1358.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1359 1360Enable profile hotness information in diagnostic line 1361 1362.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1363 1364Display include stacks for diagnostic notes 1365 1366.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1367 1368Print option name with mappable diagnostics 1369 1370.. option:: -fdiagnostics-show-template-tree 1371 1372Print a template comparison tree for differing templates 1373 1374.. option:: -fdigraphs, -fno-digraphs 1375 1376Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1377 1378.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1379 1380Allow '$' in identifiers 1381 1382.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1383 1384Enable '\[\[\]\]' attributes in all C and C++ language modes 1385 1386.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1387 1388.. option:: -fdwarf-exceptions 1389 1390Use DWARF style exceptions 1391 1392.. option:: -felide-constructors, -fno-elide-constructors 1393 1394.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1395 1396.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1397 1398Embed LLVM bitcode (option: off, all, bitcode, marker) 1399 1400.. option:: -femit-all-decls 1401 1402Emit all declarations, even if unused 1403 1404.. option:: -femulated-tls, -fno-emulated-tls 1405 1406Use emutls functions to access thread\_local variables 1407 1408.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1409 1410.. option:: -ferror-limit=<arg> 1411 1412.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1413 1414.. option:: -fexceptions, -fno-exceptions 1415 1416Enable support for exception handling 1417 1418.. option:: -fexec-charset=<arg> 1419 1420.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1421 1422.. option:: -ffast-math, -fno-fast-math 1423 1424Allow aggressive, lossy floating-point optimizations 1425 1426.. option:: -ffinite-math-only, -fno-finite-math-only 1427 1428.. option:: -ffixed-point, -fno-fixed-point 1429 1430Enable fixed point types 1431 1432.. option:: -ffor-scope, -fno-for-scope 1433 1434.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1435 1436Emits more virtual tables to improve devirtualization 1437 1438.. option:: -fforce-enable-int128, -fno-force-enable-int128 1439 1440Enable support for int128\_t type 1441 1442.. option:: -ffp-contract=<arg> 1443 1444Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma, default) \| off (never fuse) 1445 1446.. option:: -ffreestanding 1447 1448Assert that the compilation takes place in a freestanding environment 1449 1450.. option:: -ffunction-sections, -fno-function-sections 1451 1452Place each function in its own section (ELF Only) 1453 1454.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1455 1456.. option:: -fgnu-keywords, -fno-gnu-keywords 1457 1458Allow GNU-extension keywords regardless of language standard 1459 1460.. option:: -fgnu-runtime 1461 1462Generate output compatible with the standard GNU Objective-C runtime 1463 1464.. option:: -fgnu89-inline, -fno-gnu89-inline 1465 1466Use the gnu89 inline semantics 1467 1468.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1469 1470.. option:: -fhonor-nans, -fno-honor-nans 1471 1472.. option:: -fhosted 1473 1474.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1475 1476Implicitly search the file system for module map files. 1477 1478.. option:: -fimplicit-modules, -fno-implicit-modules 1479 1480.. option:: -finput-charset=<arg> 1481 1482.. option:: -finstrument-function-entry-bare 1483 1484Instrument function entry only, after inlining, without arguments to the instrumentation call 1485 1486.. option:: -finstrument-functions 1487 1488Generate calls to instrument function entry and exit 1489 1490.. option:: -finstrument-functions-after-inlining 1491 1492Like -finstrument-functions, but insert the calls after inlining 1493 1494.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1495 1496Enable the integrated assembler 1497 1498.. option:: -fjump-tables, -fno-jump-tables 1499 1500.. option:: -fkeep-static-consts 1501 1502Keep static const variables even if unused 1503 1504.. option:: -flax-vector-conversions, -fno-lax-vector-conversions 1505 1506.. option:: -flimited-precision=<arg> 1507 1508.. option:: -flto, -fno-lto 1509 1510Enable LTO in 'full' mode 1511 1512.. option:: -flto-jobs=<arg> 1513 1514Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1515 1516.. program:: clang1 1517.. option:: -flto=<arg> 1518.. program:: clang 1519 1520Set LTO mode to either 'full' or 'thin' 1521 1522.. option:: -fmacro-backtrace-limit=<arg> 1523 1524.. option:: -fmath-errno, -fno-math-errno 1525 1526Require math functions to indicate errors by setting errno 1527 1528.. option:: -fmax-type-align=<arg> 1529 1530Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1531 1532.. option:: -fmerge-all-constants, -fno-merge-all-constants 1533 1534Allow merging of constants 1535 1536.. option:: -fmessage-length=<arg> 1537 1538.. option:: -fmodule-file-deps, -fno-module-file-deps 1539 1540.. option:: -fmodule-map-file=<file> 1541 1542Load this module map file 1543 1544.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1545 1546Specify the name of the module to build 1547 1548.. option:: -fmodules, -fno-modules 1549 1550Enable the 'modules' language feature 1551 1552.. option:: -fmodules-decluse, -fno-modules-decluse 1553 1554Require declaration of modules used within a module 1555 1556.. option:: -fmodules-ignore-macro=<arg> 1557 1558Ignore the definition of the given macro when building and loading modules 1559 1560.. option:: -fmodules-search-all, -fno-modules-search-all 1561 1562Search even non-imported modules to resolve references 1563 1564.. option:: -fmodules-strict-decluse 1565 1566Like -fmodules-decluse but requires all headers to be in modules 1567 1568.. option:: -fmodules-ts 1569 1570Enable support for the C++ Modules TS 1571 1572.. option:: -fms-compatibility, -fno-ms-compatibility 1573 1574Enable full Microsoft Visual C++ compatibility 1575 1576.. option:: -fms-compatibility-version=<arg> 1577 1578Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1579 1580.. option:: -fms-extensions, -fno-ms-extensions 1581 1582Accept some non-standard constructs supported by the Microsoft compiler 1583 1584.. option:: -fms-memptr-rep=<arg> 1585 1586.. option:: -fms-volatile<arg> 1587 1588.. option:: -fmsc-version=<arg> 1589 1590Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1591 1592.. option:: -fmudflap 1593 1594.. option:: -fmudflapth 1595 1596.. option:: -fnested-functions 1597 1598.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1599 1600Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1601 1602.. option:: -fnext-runtime 1603 1604.. option:: -fno-builtin-<arg> 1605 1606Disable implicit builtin knowledge of a specific function 1607 1608.. option:: -fno-elide-type 1609 1610Do not elide types when printing diagnostics 1611 1612.. option:: -fno-max-type-align 1613 1614.. option:: -fno-operator-names 1615 1616Do not treat C++ operator name keywords as synonyms for operators 1617 1618.. option:: -fno-rtti-data 1619 1620Control emission of RTTI data 1621 1622.. option:: -fno-strict-modules-decluse 1623 1624.. option:: -fno-working-directory 1625 1626.. option:: -fnoxray-link-deps 1627 1628.. option:: -fobjc-abi-version=<arg> 1629 1630.. option:: -fobjc-arc, -fno-objc-arc 1631 1632Synthesize retain and release calls for Objective-C pointers 1633 1634.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1635 1636Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1637 1638.. option:: -fobjc-exceptions, -fno-objc-exceptions 1639 1640Enable Objective-C exceptions 1641 1642.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1643 1644.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1645 1646.. option:: -fobjc-link-runtime 1647 1648.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1649 1650.. option:: -fobjc-nonfragile-abi-version=<arg> 1651 1652.. option:: -fobjc-runtime=<arg> 1653 1654Specify the target Objective-C runtime kind and version 1655 1656.. option:: -fobjc-sender-dependent-dispatch 1657 1658.. option:: -fobjc-weak, -fno-objc-weak 1659 1660Enable ARC-style weak references in Objective-C 1661 1662.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1663 1664.. option:: -fopenmp, -fno-openmp 1665 1666Parse OpenMP pragmas and generate parallel code. 1667 1668.. option:: -fopenmp-simd, -fno-openmp-simd 1669 1670Emit OpenMP code only for SIMD-based constructs. 1671 1672.. option:: -fopenmp-version=<arg> 1673 1674.. program:: clang1 1675.. option:: -fopenmp=<arg> 1676.. program:: clang 1677 1678.. option:: -foperator-arrow-depth=<arg> 1679 1680.. option:: -foptimization-record-file=<arg> 1681 1682Specify the file name of any generated YAML optimization record 1683 1684.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1685 1686.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1687 1688.. option:: -fpack-struct, -fno-pack-struct 1689 1690.. program:: clang1 1691.. option:: -fpack-struct=<arg> 1692.. program:: clang 1693 1694Specify the default maximum struct packing alignment 1695 1696.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1697 1698Recognize and construct Pascal-style string literals 1699 1700.. option:: -fpcc-struct-return 1701 1702Override the default ABI to return all structs on the stack 1703 1704.. option:: -fpch-preprocess 1705 1706.. option:: -fpic, -fno-pic 1707 1708.. option:: -fpie, -fno-pie 1709 1710.. option:: -fplt, -fno-plt 1711 1712Use the PLT to make function calls 1713 1714.. option:: -fplugin=<dsopath> 1715 1716Load the named plugin (dynamic shared object) 1717 1718.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1719 1720.. option:: -fprofile-arcs, -fno-profile-arcs 1721 1722.. option:: -fprofile-dir=<arg> 1723 1724.. option:: -fprofile-generate, -fno-profile-generate 1725 1726Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1727 1728.. program:: clang1 1729.. option:: -fprofile-generate=<directory> 1730.. program:: clang 1731 1732Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1733 1734.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1735 1736Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1737 1738.. program:: clang1 1739.. option:: -fprofile-instr-generate=<file> 1740.. program:: clang 1741 1742Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1743 1744.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1745 1746.. program:: clang1 1747.. option:: -fprofile-instr-use=<arg> 1748.. program:: clang 1749 1750Use instrumentation data for profile-guided optimization 1751 1752.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1753 1754Specifies that the sample profile is accurate. If the sample 1755 profile is accurate, callsites without profile samples are marked 1756 as cold. Otherwise, treat callsites without profile samples as if 1757 we have no profile 1758 1759.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 1760 1761.. program:: clang1 1762.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 1763.. program:: clang 1764 1765Enable sample-based profile guided optimizations 1766 1767.. program:: clang1 1768.. option:: -fprofile-use=<pathname> 1769.. program:: clang 1770 1771Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 1772 1773.. option:: -freciprocal-math, -fno-reciprocal-math 1774 1775Allow division operations to be reassociated 1776 1777.. option:: -freg-struct-return 1778 1779Override the default ABI to return small structs in registers 1780 1781.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 1782 1783Use atexit or \_\_cxa\_atexit to register global destructors 1784 1785.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 1786 1787Enable C++17 relaxed template template argument matching 1788 1789.. option:: -freroll-loops, -fno-reroll-loops 1790 1791Turn on loop reroller 1792 1793.. option:: -fretain-comments-from-system-headers 1794 1795.. option:: -frewrite-imports, -fno-rewrite-imports 1796 1797.. option:: -frewrite-includes, -fno-rewrite-includes 1798 1799.. option:: -frewrite-map-file <arg> 1800 1801.. program:: clang1 1802.. option:: -frewrite-map-file=<arg> 1803.. program:: clang 1804 1805.. option:: -fropi, -fno-ropi 1806 1807.. option:: -frtti, -fno-rtti 1808 1809.. option:: -frwpi, -fno-rwpi 1810 1811.. option:: -fsave-optimization-record, -fno-save-optimization-record 1812 1813Generate a YAML optimization record file 1814 1815.. option:: -fseh-exceptions 1816 1817Use SEH style exceptions 1818 1819.. option:: -fshort-enums, -fno-short-enums 1820 1821Allocate to an enum type only as many bytes as it needs for the declared range of possible values 1822 1823.. option:: -fshort-wchar, -fno-short-wchar 1824 1825Force wchar\_t to be a short unsigned int 1826 1827.. option:: -fshow-column, -fno-show-column 1828 1829.. option:: -fshow-overloads=<arg> 1830 1831Which overload candidates to show when overload resolution fails: best\|all; defaults to all 1832 1833.. option:: -fshow-source-location, -fno-show-source-location 1834 1835.. option:: -fsignaling-math, -fno-signaling-math 1836 1837.. option:: -fsigned-bitfields 1838 1839.. option:: -fsigned-char, -fno-signed-char, --signed-char 1840 1841.. option:: -fsigned-zeros, -fno-signed-zeros 1842 1843.. option:: -fsized-deallocation, -fno-sized-deallocation 1844 1845Enable C++14 sized global deallocation functions 1846 1847.. option:: -fsjlj-exceptions 1848 1849Use SjLj style exceptions 1850 1851.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 1852 1853Enable the superword-level parallelism vectorization passes 1854 1855.. option:: -fspell-checking, -fno-spell-checking 1856 1857.. option:: -fspell-checking-limit=<arg> 1858 1859.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 1860 1861Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 1862 1863.. option:: -fsplit-stack 1864 1865.. option:: -fstack-protector, -fno-stack-protector 1866 1867Enable stack protectors for functions potentially vulnerable to stack smashing 1868 1869.. option:: -fstack-protector-all 1870 1871Force the usage of stack protectors for all functions 1872 1873.. option:: -fstack-protector-strong 1874 1875Use a strong heuristic to apply stack protectors to functions 1876 1877.. option:: -fstack-size-section, -fno-stack-size-section 1878 1879Emit section containing metadata on function stack sizes 1880 1881.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 1882 1883Emit full debug info for all types used by the program 1884 1885.. option:: -fstrict-aliasing, -fno-strict-aliasing 1886 1887.. option:: -fstrict-enums, -fno-strict-enums 1888 1889Enable optimizations based on the strict definition of an enum's value range 1890 1891.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 1892 1893Assume that overflowing float-to-int casts are undefined (default) 1894 1895.. option:: -fstrict-overflow, -fno-strict-overflow 1896 1897.. option:: -fstrict-return, -fno-strict-return 1898 1899Always treat control flow paths that fall off the end of a non-void function as unreachable 1900 1901.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 1902 1903Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 1904 1905.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 1906 1907.. option:: -ftabstop=<arg> 1908 1909.. option:: -ftemplate-backtrace-limit=<arg> 1910 1911.. option:: -ftemplate-depth-<arg> 1912 1913.. option:: -ftemplate-depth=<arg> 1914 1915.. option:: -ftest-coverage 1916 1917.. option:: -fthinlto-index=<arg> 1918 1919Perform ThinLTO importing using provided function summary index 1920 1921.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 1922 1923.. option:: -ftime-report 1924 1925.. option:: -ftls-model=<arg> 1926 1927.. option:: -ftrap-function=<arg> 1928 1929Issue call to specified function rather than a trap instruction 1930 1931.. option:: -ftrapping-math, -fno-trapping-math 1932 1933.. option:: -ftrapv 1934 1935Trap on integer overflow 1936 1937.. option:: -ftrapv-handler <arg> 1938 1939.. program:: clang1 1940.. option:: -ftrapv-handler=<function name> 1941.. program:: clang 1942 1943Specify the function to be called on overflow 1944 1945.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 1946 1947Process trigraph sequences 1948 1949.. option:: -funique-section-names, -fno-unique-section-names 1950 1951Use unique names for text and data sections (ELF Only) 1952 1953.. option:: -funit-at-a-time, -fno-unit-at-a-time 1954 1955.. option:: -funroll-loops, -fno-unroll-loops 1956 1957Turn on loop unroller 1958 1959.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 1960 1961.. option:: -funsigned-bitfields 1962 1963.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 1964 1965.. option:: -funwind-tables, -fno-unwind-tables 1966 1967.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 1968 1969.. option:: -fuse-init-array, -fno-use-init-array 1970 1971Use .init\_array instead of .ctors 1972 1973.. option:: -fuse-ld=<arg> 1974 1975.. option:: -fuse-line-directives, -fno-use-line-directives 1976 1977.. option:: -fveclib=<arg> 1978 1979Use the given vector functions library 1980 1981.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 1982 1983Enable the loop vectorization passes 1984 1985.. option:: -fverbose-asm, -fno-verbose-asm 1986 1987.. option:: -fvisibility-inlines-hidden 1988 1989Give inline C++ member functions hidden visibility by default 1990 1991.. option:: -fvisibility-ms-compat 1992 1993Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 1994 1995.. option:: -fvisibility=<arg> 1996 1997Set the default symbol visibility for all global declarations 1998 1999.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2000 2001Enables whole-program vtable optimization. Requires -flto 2002 2003.. option:: -fwrapv, -fno-wrapv 2004 2005Treat signed integer overflow as two's complement 2006 2007.. option:: -fwritable-strings 2008 2009Store string literals as writable data 2010 2011.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2012 2013Determine whether to always emit \_\_xray\_customevent(...) calls even if the function it appears in is not always instrumented. 2014 2015.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2016 2017Determine whether to always emit \_\_xray\_typedevent(...) calls even if the function it appears in is not always instrumented. 2018 2019.. option:: -fxray-always-instrument=<arg> 2020 2021DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2022 2023.. option:: -fxray-attr-list=<arg> 2024 2025Filename defining the list of functions/types for imbuing XRay attributes. 2026 2027.. option:: -fxray-instruction-threshold<arg> 2028 2029.. program:: clang1 2030.. option:: -fxray-instruction-threshold=<arg> 2031.. program:: clang 2032 2033Sets the minimum function size to instrument with XRay 2034 2035.. option:: -fxray-instrument, -fno-xray-instrument 2036 2037Generate XRay instrumentation sleds on function entry and exit 2038 2039.. option:: -fxray-instrumentation-bundle=<arg> 2040 2041Select which XRay instrumentation points to emit. Options: all, none, function, custom. Default is 'all'. 2042 2043.. option:: -fxray-link-deps 2044 2045Tells clang to add the link dependencies for XRay. 2046 2047.. option:: -fxray-modes=<arg> 2048 2049List of modes to link in by default into XRay instrumented binaries. 2050 2051.. option:: -fxray-never-instrument=<arg> 2052 2053DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2054 2055.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2056 2057.. option:: -fzvector, -fno-zvector, -mzvector 2058 2059Enable System z vector language extension 2060 2061.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2062 2063.. option:: -pedantic-errors, --pedantic-errors 2064 2065OpenCL flags 2066------------ 2067.. option:: -cl-denorms-are-zero 2068 2069OpenCL only. Allow denormals to be flushed to zero. 2070 2071.. option:: -cl-fast-relaxed-math 2072 2073OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2074 2075.. option:: -cl-finite-math-only 2076 2077OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2078 2079.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2080 2081OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2082 2083.. option:: -cl-kernel-arg-info 2084 2085OpenCL only. Generate kernel argument metadata. 2086 2087.. option:: -cl-mad-enable 2088 2089OpenCL only. Allow use of less precise MAD computations in the generated binary. 2090 2091.. option:: -cl-no-signed-zeros 2092 2093OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2094 2095.. option:: -cl-opt-disable 2096 2097OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2098 2099.. option:: -cl-single-precision-constant 2100 2101OpenCL only. Treat double precision floating-point constant as single precision constant. 2102 2103.. option:: -cl-std=<arg> 2104 2105OpenCL language standard to compile for. 2106 2107.. option:: -cl-strict-aliasing 2108 2109OpenCL only. This option is added for compatibility with OpenCL 1.0. 2110 2111.. option:: -cl-uniform-work-group-size 2112 2113OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2114 2115.. option:: -cl-unsafe-math-optimizations 2116 2117OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2118 2119Target-dependent compilation options 2120~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2121.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg> 2122 2123Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2124 2125.. option:: -m16 2126 2127.. option:: -m32 2128 2129.. option:: -m64 2130 2131.. option:: -mabi=<arg> 2132 2133.. option:: -malign-double 2134 2135Align doubles to two words in structs (x86 only) 2136 2137.. option:: -march=<arg> 2138 2139.. option:: -masm=<arg> 2140 2141.. option:: -mbackchain, -mno-backchain 2142 2143Link stack frames through backchain on System Z 2144 2145.. option:: -mcmodel=<arg> 2146 2147.. option:: -mconsole<arg> 2148 2149.. option:: -mcpu=<arg>, -mv4 (equivalent to -mcpu=hexagonv4), -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) 2150 2151.. option:: -mcrc, -mno-crc 2152 2153Allow use of CRC instructions (ARM/Mips only) 2154 2155.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2156 2157.. option:: -mdll<arg> 2158 2159.. option:: -mdynamic-no-pic<arg> 2160 2161.. option:: -meabi <arg> 2162 2163Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2164 2165.. option:: -mfentry 2166 2167Insert calls to fentry at function entry (x86 only) 2168 2169.. option:: -mfloat-abi=<arg> 2170 2171.. option:: -mfpmath=<arg> 2172 2173.. option:: -mfpu=<arg> 2174 2175.. option:: -mglobal-merge, -mno-global-merge 2176 2177Enable merging of globals 2178 2179.. option:: -mhard-float 2180 2181.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2182 2183.. option:: -miamcu, -mno-iamcu 2184 2185Use Intel MCU ABI 2186 2187.. option:: -mimplicit-float, -mno-implicit-float 2188 2189.. option:: -mimplicit-it=<arg> 2190 2191.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2192 2193(integrated-as) Emit an object file which can be used with an incremental linker 2194 2195.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2196 2197.. option:: -mkernel 2198 2199.. option:: -mlong-calls, -mno-long-calls 2200 2201Generate branches with extended addressability, usually via indirect jumps. 2202 2203.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2204 2205Set Mac OS X deployment target 2206 2207.. option:: -mmcu=<arg> 2208 2209.. option:: -mms-bitfields, -mno-ms-bitfields 2210 2211Set the default structure layout to be compatible with the Microsoft compiler standard 2212 2213.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2214 2215Omit frame pointer setup for leaf functions 2216 2217.. option:: -moslib=<arg> 2218 2219.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2220 2221Use copy relocations support for PIE builds 2222 2223.. option:: -mprefer-vector-width=<arg> 2224 2225Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2226 2227.. option:: -mqdsp6-compat 2228 2229Enable hexagon-qdsp6 backward compatibility 2230 2231.. option:: -mrecip 2232 2233.. program:: clang1 2234.. option:: -mrecip=<arg1>,<arg2>... 2235.. program:: clang 2236 2237.. option:: -mred-zone, -mno-red-zone 2238 2239.. option:: -mregparm=<arg> 2240 2241.. option:: -mrelax-all, -mno-relax-all 2242 2243(integrated-as) Relax all machine instructions 2244 2245.. option:: -mretpoline, -mno-retpoline 2246 2247.. option:: -mrtd, -mno-rtd 2248 2249Make StdCall calling convention the default 2250 2251.. option:: -msign-return-address=<arg> 2252 2253Select return address signing scope 2254 2255.. option:: -msoft-float, -mno-soft-float 2256 2257Use software floating point 2258 2259.. option:: -mstack-alignment=<arg> 2260 2261Set the stack alignment 2262 2263.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2264 2265Enable stack probes 2266 2267.. option:: -mstack-probe-size=<arg> 2268 2269Set the stack probe size 2270 2271.. option:: -mstackrealign, -mno-stackrealign 2272 2273Force realign the stack at entry to every function 2274 2275.. option:: -mthread-model <arg> 2276 2277The thread model to use, e.g. posix, single (posix by default) 2278 2279.. option:: -mthreads<arg> 2280 2281.. option:: -mthumb, -mno-thumb 2282 2283.. option:: -mtune=<arg> 2284 2285.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2286 2287.. option:: -municode<arg> 2288 2289.. option:: -mvx, -mno-vx 2290 2291.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2292 2293.. option:: -mwatchos-version-min=<arg> 2294 2295.. option:: -mwindows<arg> 2296 2297.. option:: -mx32 2298 2299AARCH64 2300------- 2301.. option:: -ffixed-x1 2302 2303Reserve the x1 register (AArch64 only) 2304 2305.. option:: -ffixed-x2 2306 2307Reserve the x2 register (AArch64 only) 2308 2309.. option:: -ffixed-x3 2310 2311Reserve the x3 register (AArch64 only) 2312 2313.. option:: -ffixed-x4 2314 2315Reserve the x4 register (AArch64 only) 2316 2317.. option:: -ffixed-x5 2318 2319Reserve the x5 register (AArch64 only) 2320 2321.. option:: -ffixed-x6 2322 2323Reserve the x6 register (AArch64 only) 2324 2325.. option:: -ffixed-x7 2326 2327Reserve the x7 register (AArch64 only) 2328 2329.. option:: -ffixed-x18 2330 2331Reserve the x18 register (AArch64 only) 2332 2333.. option:: -ffixed-x20 2334 2335Reserve the x20 register (AArch64 only) 2336 2337.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2338 2339Workaround Cortex-A53 erratum 835769 (AArch64 only) 2340 2341.. option:: -mgeneral-regs-only 2342 2343Generate code which only uses the general purpose registers (AArch64 only) 2344 2345AMDGPU 2346------ 2347.. option:: -mxnack, -mno-xnack 2348 2349Enable XNACK (AMDGPU only) 2350 2351ARM 2352--- 2353.. option:: -ffixed-r9 2354 2355Reserve the r9 register (ARM only) 2356 2357.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2358 2359Disallow generation of data access to code sections (ARM only) 2360 2361.. option:: -mno-movt 2362 2363Disallow use of movt/movw pairs (ARM only) 2364 2365.. option:: -mno-neg-immediates 2366 2367Disallow converting instructions with negative immediates to their negation or inversion. 2368 2369.. option:: -mnocrc 2370 2371Disallow use of CRC instructions (ARM only) 2372 2373.. option:: -mrestrict-it, -mno-restrict-it 2374 2375Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2376 2377.. option:: -mtp=<arg> 2378 2379Read thread pointer from coprocessor register (ARM only) 2380 2381.. option:: -munaligned-access, -mno-unaligned-access 2382 2383Allow memory accesses to be unaligned (AArch32/AArch64 only) 2384 2385Hexagon 2386------- 2387.. option:: -mieee-rnd-near 2388 2389.. option:: -mmemops, -mno-memops 2390 2391Enable generation of memop instructions 2392 2393.. option:: -mnvj, -mno-nvj 2394 2395Enable generation of new-value jumps 2396 2397.. option:: -mnvs, -mno-nvs 2398 2399Enable generation of new-value stores 2400 2401.. option:: -mpackets, -mno-packets 2402 2403Enable generation of instruction packets 2404 2405Hexagon 2406------- 2407.. option:: -mhvx, -mno-hvx 2408 2409Enable Hexagon Vector eXtensions 2410 2411.. option:: -mhvx-length=<arg> 2412 2413Set Hexagon Vector Length 2414 2415.. program:: clang1 2416.. option:: -mhvx=<arg> 2417.. program:: clang 2418 2419Enable Hexagon Vector eXtensions 2420 2421MIPS 2422---- 2423.. option:: -mabicalls, -mno-abicalls 2424 2425Enable SVR4-style position-independent code (Mips only) 2426 2427.. option:: -mabs=<arg> 2428 2429.. option:: -mcheck-zero-division, -mno-check-zero-division 2430 2431.. option:: -mcompact-branches=<arg> 2432 2433.. option:: -mdouble-float 2434 2435.. option:: -mdsp, -mno-dsp 2436 2437.. option:: -mdspr2, -mno-dspr2 2438 2439.. option:: -membedded-data, -mno-embedded-data 2440 2441Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 2442 2443.. option:: -mextern-sdata, -mno-extern-sdata 2444 2445Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 2446 2447.. option:: -mfp32 2448 2449Use 32-bit floating point registers (MIPS only) 2450 2451.. option:: -mfp64 2452 2453Use 64-bit floating point registers (MIPS only) 2454 2455.. option:: -mginv, -mno-ginv 2456 2457.. option:: -mgpopt, -mno-gpopt 2458 2459Use GP relative accesses for symbols known to be in a small data section (MIPS) 2460 2461.. option:: -mindirect-jump=<arg> 2462 2463Change indirect jump instructions to inhibit speculation 2464 2465.. option:: -mips16 2466 2467.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 2468 2469.. option:: -mlocal-sdata, -mno-local-sdata 2470 2471Extend the -G behaviour to object local data (MIPS) 2472 2473.. option:: -mmadd4, -mno-madd4 2474 2475Enable the generation of 4-operand madd.s, madd.d and related instructions. 2476 2477.. option:: -mmicromips, -mno-micromips 2478 2479.. option:: -mmsa, -mno-msa 2480 2481Enable MSA ASE (MIPS only) 2482 2483.. option:: -mmt, -mno-mt 2484 2485Enable MT ASE (MIPS only) 2486 2487.. option:: -mnan=<arg> 2488 2489.. option:: -mno-mips16 2490 2491.. option:: -msingle-float 2492 2493.. option:: -mvirt, -mno-virt 2494 2495.. option:: -mxgot, -mno-xgot 2496 2497PowerPC 2498------- 2499.. option:: -maltivec, -mno-altivec 2500 2501.. option:: -mcmpb, -mno-cmpb 2502 2503.. option:: -mcrbits, -mno-crbits 2504 2505.. option:: -mcrypto, -mno-crypto 2506 2507.. option:: -mdirect-move, -mno-direct-move 2508 2509.. option:: -mfloat128, -mno-float128 2510 2511.. option:: -mfprnd, -mno-fprnd 2512 2513.. option:: -mhtm, -mno-htm 2514 2515.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 2516 2517.. option:: -misel, -mno-isel 2518 2519.. option:: -mlongcall, -mno-longcall 2520 2521.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 2522 2523.. option:: -mpopcntd, -mno-popcntd 2524 2525.. option:: -mpower8-vector, -mno-power8-vector 2526 2527.. option:: -mpower9-vector, -mno-power9-vector 2528 2529.. option:: -mqpx, -mno-qpx 2530 2531.. option:: -msecure-plt 2532 2533.. option:: -mvsx, -mno-vsx 2534 2535WebAssembly 2536----------- 2537.. option:: -mexception-handling, -mno-exception-handling 2538 2539.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 2540 2541.. option:: -msign-ext, -mno-sign-ext 2542 2543.. option:: -msimd128, -mno-simd128 2544 2545X86 2546--- 2547.. option:: -m3dnow, -mno-3dnow 2548 2549.. option:: -m3dnowa, -mno-3dnowa 2550 2551.. option:: -madx, -mno-adx 2552 2553.. option:: -maes, -mno-aes 2554 2555.. option:: -mavx, -mno-avx 2556 2557.. option:: -mavx2, -mno-avx2 2558 2559.. option:: -mavx512bitalg, -mno-avx512bitalg 2560 2561.. option:: -mavx512bw, -mno-avx512bw 2562 2563.. option:: -mavx512cd, -mno-avx512cd 2564 2565.. option:: -mavx512dq, -mno-avx512dq 2566 2567.. option:: -mavx512er, -mno-avx512er 2568 2569.. option:: -mavx512f, -mno-avx512f 2570 2571.. option:: -mavx512ifma, -mno-avx512ifma 2572 2573.. option:: -mavx512pf, -mno-avx512pf 2574 2575.. option:: -mavx512vbmi, -mno-avx512vbmi 2576 2577.. option:: -mavx512vbmi2, -mno-avx512vbmi2 2578 2579.. option:: -mavx512vl, -mno-avx512vl 2580 2581.. option:: -mavx512vnni, -mno-avx512vnni 2582 2583.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 2584 2585.. option:: -mbmi, -mno-bmi 2586 2587.. option:: -mbmi2, -mno-bmi2 2588 2589.. option:: -mcldemote, -mno-cldemote 2590 2591.. option:: -mclflushopt, -mno-clflushopt 2592 2593.. option:: -mclwb, -mno-clwb 2594 2595.. option:: -mclzero, -mno-clzero 2596 2597.. option:: -mcx16, -mno-cx16 2598 2599.. option:: -mf16c, -mno-f16c 2600 2601.. option:: -mfma, -mno-fma 2602 2603.. option:: -mfma4, -mno-fma4 2604 2605.. option:: -mfsgsbase, -mno-fsgsbase 2606 2607.. option:: -mfxsr, -mno-fxsr 2608 2609.. option:: -mgfni, -mno-gfni 2610 2611.. option:: -minvpcid, -mno-invpcid 2612 2613.. option:: -mlwp, -mno-lwp 2614 2615.. option:: -mlzcnt, -mno-lzcnt 2616 2617.. option:: -mmmx, -mno-mmx 2618 2619.. option:: -mmovbe, -mno-movbe 2620 2621.. option:: -mmovdir64b, -mno-movdir64b 2622 2623.. option:: -mmovdiri, -mno-movdiri 2624 2625.. option:: -mmpx, -mno-mpx 2626 2627.. option:: -mmwaitx, -mno-mwaitx 2628 2629.. option:: -mpclmul, -mno-pclmul 2630 2631.. option:: -mpconfig, -mno-pconfig 2632 2633.. option:: -mpku, -mno-pku 2634 2635.. option:: -mpopcnt, -mno-popcnt 2636 2637.. option:: -mprefetchwt1, -mno-prefetchwt1 2638 2639.. option:: -mprfchw, -mno-prfchw 2640 2641.. option:: -mptwrite, -mno-ptwrite 2642 2643.. option:: -mrdpid, -mno-rdpid 2644 2645.. option:: -mrdrnd, -mno-rdrnd 2646 2647.. option:: -mrdseed, -mno-rdseed 2648 2649.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 2650 2651.. option:: -mrtm, -mno-rtm 2652 2653.. option:: -msahf, -mno-sahf 2654 2655.. option:: -msgx, -mno-sgx 2656 2657.. option:: -msha, -mno-sha 2658 2659.. option:: -mshstk, -mno-shstk 2660 2661.. option:: -msse, -mno-sse 2662 2663.. option:: -msse2, -mno-sse2 2664 2665.. option:: -msse3, -mno-sse3 2666 2667.. option:: -msse4.1, -mno-sse4.1 2668 2669.. program:: clang1 2670.. option:: -msse4.2, -mno-sse4.2, -msse4 2671.. program:: clang 2672 2673.. option:: -msse4a, -mno-sse4a 2674 2675.. option:: -mssse3, -mno-ssse3 2676 2677.. option:: -mtbm, -mno-tbm 2678 2679.. option:: -mvaes, -mno-vaes 2680 2681.. option:: -mvpclmulqdq, -mno-vpclmulqdq 2682 2683.. option:: -mwaitpkg, -mno-waitpkg 2684 2685.. option:: -mwbnoinvd, -mno-wbnoinvd 2686 2687.. option:: -mx87, -m80387, -mno-x87 2688 2689.. option:: -mxop, -mno-xop 2690 2691.. option:: -mxsave, -mno-xsave 2692 2693.. option:: -mxsavec, -mno-xsavec 2694 2695.. option:: -mxsaveopt, -mno-xsaveopt 2696 2697.. option:: -mxsaves, -mno-xsaves 2698 2699RISCV 2700----- 2701.. option:: -mrelax, -mno-relax 2702 2703Enable linker relaxation 2704 2705Optimization level 2706~~~~~~~~~~~~~~~~~~ 2707 2708Flags controlling how much optimization should be performed. 2709 2710.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg> 2711 2712.. option:: -Ofast<arg> 2713 2714Debug information generation 2715~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2716 2717Flags controlling how much and what kind of debug information should be 2718generated. 2719 2720Kind and level of debug information 2721----------------------------------- 2722.. option:: -g, --debug, --debug=<arg> 2723 2724Generate source-level debug information 2725 2726.. option:: -gdwarf-2 2727 2728Generate source-level debug information with dwarf version 2 2729 2730.. option:: -gdwarf-3 2731 2732Generate source-level debug information with dwarf version 3 2733 2734.. option:: -gdwarf-4, -gdwarf 2735 2736Generate source-level debug information with dwarf version 4 2737 2738.. option:: -gdwarf-5 2739 2740Generate source-level debug information with dwarf version 5 2741 2742.. option:: -gfull 2743 2744.. option:: -gused 2745 2746Debug level 2747___________ 2748.. option:: -g0 2749 2750.. option:: -g2 2751 2752.. option:: -g3 2753 2754.. option:: -ggdb0 2755 2756.. option:: -ggdb1 2757 2758.. option:: -ggdb2 2759 2760.. option:: -ggdb3 2761 2762.. option:: -gline-tables-only, -g1, -gmlt 2763 2764Emit debug line number tables only 2765 2766.. option:: -gmodules 2767 2768Generate debug info with external references to clang modules or precompiled headers 2769 2770Debugger to tune debug information for 2771______________________________________ 2772.. option:: -ggdb 2773 2774.. option:: -glldb 2775 2776.. option:: -gsce 2777 2778Debug information flags 2779----------------------- 2780.. option:: -gcolumn-info, -gno-column-info 2781 2782.. option:: -gdwarf-aranges 2783 2784.. option:: -gembed-source, -gno-embed-source 2785 2786Embed source text in DWARF debug sections 2787 2788.. option:: -ggnu-pubnames, -gno-gnu-pubnames 2789 2790.. option:: -gpubnames, -gno-pubnames 2791 2792.. option:: -grecord-gcc-switches, -gno-record-gcc-switches 2793 2794.. option:: -gsplit-dwarf 2795 2796.. option:: -gstrict-dwarf, -gno-strict-dwarf 2797 2798.. option:: -gz 2799 2800DWARF debug sections compression type 2801 2802.. program:: clang1 2803.. option:: -gz=<arg> 2804.. program:: clang 2805 2806DWARF debug sections compression type 2807 2808Static analyzer flags 2809===================== 2810 2811Flags controlling the behavior of the Clang Static Analyzer. 2812 2813.. option:: -Xanalyzer <arg> 2814 2815Pass <arg> to the static analyzer 2816 2817Fortran compilation flags 2818========================= 2819 2820Flags that will be passed onto the ``gfortran`` compiler when Clang is given 2821a Fortran input. 2822 2823.. option:: -A<arg>, --assert <arg>, --assert=<arg> 2824 2825.. option:: -A-<arg> 2826 2827.. option:: -J<arg> 2828 2829.. option:: -cpp 2830 2831.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 2832 2833.. option:: -falign-commons, -fno-align-commons 2834 2835.. option:: -fall-intrinsics, -fno-all-intrinsics 2836 2837.. option:: -fautomatic, -fno-automatic 2838 2839.. option:: -fbackslash, -fno-backslash 2840 2841.. option:: -fbacktrace, -fno-backtrace 2842 2843.. option:: -fblas-matmul-limit=<arg> 2844 2845.. option:: -fbounds-check, -fno-bounds-check 2846 2847.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 2848 2849.. option:: -fcheck=<arg> 2850 2851.. option:: -fcoarray=<arg> 2852 2853.. option:: -fconvert=<arg> 2854 2855.. option:: -fcray-pointer, -fno-cray-pointer 2856 2857.. option:: -fd-lines-as-code, -fno-d-lines-as-code 2858 2859.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 2860 2861.. option:: -fdefault-double-8, -fno-default-double-8 2862 2863.. option:: -fdefault-integer-8, -fno-default-integer-8 2864 2865.. option:: -fdefault-real-8, -fno-default-real-8 2866 2867.. option:: -fdollar-ok, -fno-dollar-ok 2868 2869.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 2870 2871.. option:: -fdump-fortran-original, -fno-dump-fortran-original 2872 2873.. option:: -fdump-parse-tree, -fno-dump-parse-tree 2874 2875.. option:: -fexternal-blas, -fno-external-blas 2876 2877.. option:: -ff2c, -fno-f2c 2878 2879.. option:: -ffixed-form, -fno-fixed-form 2880 2881.. option:: -ffixed-line-length-<arg> 2882 2883.. option:: -ffpe-trap=<arg> 2884 2885.. option:: -ffree-form, -fno-free-form 2886 2887.. option:: -ffree-line-length-<arg> 2888 2889.. option:: -ffrontend-optimize, -fno-frontend-optimize 2890 2891.. option:: -fimplicit-none, -fno-implicit-none 2892 2893.. option:: -finit-character=<arg> 2894 2895.. option:: -finit-integer=<arg> 2896 2897.. option:: -finit-local-zero, -fno-init-local-zero 2898 2899.. option:: -finit-logical=<arg> 2900 2901.. option:: -finit-real=<arg> 2902 2903.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 2904 2905.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 2906 2907.. option:: -fmax-array-constructor=<arg> 2908 2909.. option:: -fmax-errors=<arg> 2910 2911.. option:: -fmax-identifier-length, -fno-max-identifier-length 2912 2913.. option:: -fmax-stack-var-size=<arg> 2914 2915.. option:: -fmax-subrecord-length=<arg> 2916 2917.. option:: -fmodule-private, -fno-module-private 2918 2919.. option:: -fpack-derived, -fno-pack-derived 2920 2921.. option:: -fprotect-parens, -fno-protect-parens 2922 2923.. option:: -frange-check, -fno-range-check 2924 2925.. option:: -freal-4-real-10, -fno-real-4-real-10 2926 2927.. option:: -freal-4-real-16, -fno-real-4-real-16 2928 2929.. option:: -freal-4-real-8, -fno-real-4-real-8 2930 2931.. option:: -freal-8-real-10, -fno-real-8-real-10 2932 2933.. option:: -freal-8-real-16, -fno-real-8-real-16 2934 2935.. option:: -freal-8-real-4, -fno-real-8-real-4 2936 2937.. option:: -frealloc-lhs, -fno-realloc-lhs 2938 2939.. option:: -frecord-marker=<arg> 2940 2941.. option:: -frecursive, -fno-recursive 2942 2943.. option:: -frepack-arrays, -fno-repack-arrays 2944 2945.. option:: -fsecond-underscore, -fno-second-underscore 2946 2947.. option:: -fsign-zero, -fno-sign-zero 2948 2949.. option:: -fstack-arrays, -fno-stack-arrays 2950 2951.. option:: -funderscoring, -fno-underscoring 2952 2953.. option:: -fwhole-file, -fno-whole-file 2954 2955.. option:: -imultilib <arg> 2956 2957.. option:: -nocpp 2958 2959.. option:: -static-libgfortran 2960 2961Linker flags 2962============ 2963Flags that are passed on to the linker 2964 2965.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 2966 2967Add directory to library search path 2968 2969.. option:: -Mach 2970 2971.. option:: -T<script> 2972 2973Specify <script> as linker script 2974 2975.. option:: -Tbss<addr> 2976 2977Set starting address of BSS to <addr> 2978 2979.. option:: -Tdata<addr> 2980 2981Set starting address of DATA to <addr> 2982 2983.. option:: -Ttext<addr> 2984 2985Set starting address of TEXT to <addr> 2986 2987.. option:: -Wl,<arg>,<arg2>... 2988 2989Pass the comma separated arguments in <arg> to the linker 2990 2991.. option:: -X 2992 2993.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 2994 2995Pass <arg> to the linker 2996 2997.. program:: clang1 2998.. option:: -Z 2999.. program:: clang 3000 3001.. option:: -e<arg>, --entry 3002 3003.. option:: -filelist <arg> 3004 3005.. option:: --hip-device-lib-path=<arg> 3006 3007HIP device library path 3008 3009.. option:: --hip-device-lib=<arg> 3010 3011HIP device library 3012 3013.. option:: -l<arg> 3014 3015.. option:: -r 3016 3017.. option:: -rpath <arg> 3018 3019.. option:: -s 3020 3021.. option:: -t 3022 3023.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3024 3025.. option:: -undef 3026 3027undef all system defines 3028 3029.. option:: -undefined<arg>, --no-undefined 3030 3031.. option:: -z <arg> 3032 3033Pass -z <arg> to the linker 3034 3035