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 following 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:: -noprofilelib 350 351.. option:: -noseglinkedit 352 353.. option:: -nostartfiles 354 355.. option:: -nostdinc, --no-standard-includes 356 357.. program:: clang1 358.. option:: -nostdinc++ 359.. program:: clang 360 361Disable standard #include directories for the C++ standard library 362 363.. option:: -nostdlib, --no-standard-libraries 364 365.. program:: clang1 366.. option:: -nostdlib++ 367.. program:: clang 368 369.. option:: -nostdlibinc 370 371.. option:: -o<file>, --output <arg>, --output=<arg> 372 373Write output to <file> 374 375.. option:: -objcmt-atomic-property 376 377Make migration to 'atomic' properties 378 379.. option:: -objcmt-migrate-all 380 381Enable migration to modern ObjC 382 383.. option:: -objcmt-migrate-annotation 384 385Enable migration to property and method annotations 386 387.. option:: -objcmt-migrate-designated-init 388 389Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 390 391.. option:: -objcmt-migrate-instancetype 392 393Enable migration to infer instancetype for method result type 394 395.. option:: -objcmt-migrate-literals 396 397Enable migration to modern ObjC literals 398 399.. option:: -objcmt-migrate-ns-macros 400 401Enable migration to NS\_ENUM/NS\_OPTIONS macros 402 403.. option:: -objcmt-migrate-property 404 405Enable migration to modern ObjC property 406 407.. option:: -objcmt-migrate-property-dot-syntax 408 409Enable migration of setter/getter messages to property-dot syntax 410 411.. option:: -objcmt-migrate-protocol-conformance 412 413Enable migration to add protocol conformance on classes 414 415.. option:: -objcmt-migrate-readonly-property 416 417Enable migration to modern ObjC readonly property 418 419.. option:: -objcmt-migrate-readwrite-property 420 421Enable migration to modern ObjC readwrite property 422 423.. option:: -objcmt-migrate-subscripting 424 425Enable migration to modern ObjC subscripting 426 427.. option:: -objcmt-ns-nonatomic-iosonly 428 429Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 430 431.. option:: -objcmt-returns-innerpointer-property 432 433Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 434 435.. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> 436 437Only modify files with a filename contained in the provided directory path 438 439.. option:: -object 440 441.. option:: -p, --profile 442 443.. option:: -pagezero\_size<arg> 444 445.. option:: -pg 446 447Enable mcount instrumentation 448 449.. option:: -pie 450 451.. option:: -pipe, --pipe 452 453Use pipes between commands, when possible 454 455.. option:: -prebind 456 457.. program:: clang1 458.. option:: -prebind\_all\_twolevel\_modules 459.. program:: clang 460 461.. option:: -preload 462 463.. option:: --print-diagnostic-categories 464 465.. option:: -print-effective-triple, --print-effective-triple 466 467Print the effective target triple 468 469.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 470 471Print the full library path of <file> 472 473.. option:: -print-ivar-layout 474 475Enable Objective-C Ivar layout bitmap print trace 476 477.. option:: -print-libgcc-file-name, --print-libgcc-file-name 478 479Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 480 481.. option:: -print-multi-directory, --print-multi-directory 482 483.. option:: -print-multi-lib, --print-multi-lib 484 485.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 486 487Print the full program path of <name> 488 489.. option:: -print-resource-dir, --print-resource-dir 490 491Print the resource directory pathname 492 493.. option:: -print-search-dirs, --print-search-dirs 494 495Print the paths used for finding libraries and programs 496 497.. option:: -print-target-triple, --print-target-triple 498 499Print the normalized target triple 500 501.. option:: -private\_bundle 502 503.. option:: -pthread, -no-pthread 504 505Support POSIX threads in generated code 506 507.. option:: -pthreads 508 509.. option:: -rdynamic 510 511.. option:: -read\_only\_relocs <arg> 512 513.. option:: -relocatable-pch, --relocatable-pch 514 515Whether to build a relocatable precompiled header 516 517.. option:: -remap 518 519.. option:: -rewrite-legacy-objc 520 521Rewrite Legacy Objective-C source to C++ 522 523.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 524 525Compiler runtime library to use 526 527.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 528 529Save llvm statistics. 530 531.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 532 533Save intermediate compilation results. 534 535.. option:: -sectalign <arg1> <arg2> <arg3> 536 537.. option:: -sectcreate <arg1> <arg2> <arg3> 538 539.. option:: -sectobjectsymbols <arg1> <arg2> 540 541.. option:: -sectorder <arg1> <arg2> <arg3> 542 543.. option:: -seg1addr<arg> 544 545.. option:: -seg\_addr\_table <arg> 546 547.. program:: clang1 548.. option:: -seg\_addr\_table\_filename <arg> 549.. program:: clang 550 551.. option:: -segaddr <arg1> <arg2> 552 553.. option:: -segcreate <arg1> <arg2> <arg3> 554 555.. option:: -seglinkedit 556 557.. option:: -segprot <arg1> <arg2> <arg3> 558 559.. option:: -segs\_read\_<arg> 560 561.. program:: clang1 562.. option:: -segs\_read\_only\_addr <arg> 563.. program:: clang 564 565.. program:: clang2 566.. option:: -segs\_read\_write\_addr <arg> 567.. program:: clang 568 569.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 570 571Serialize compiler diagnostics to a file 572 573.. option:: -shared, --shared 574 575.. option:: -shared-libgcc 576 577.. option:: -shared-libsan, -shared-libasan 578 579Dynamically link the sanitizer runtime 580 581.. option:: -single\_module 582 583.. option:: -specs=<arg>, --specs=<arg> 584 585.. option:: -static, --static 586 587.. option:: -static-libgcc 588 589.. option:: -static-libsan 590 591Statically link the sanitizer runtime 592 593.. option:: -static-libstdc++ 594 595.. option:: -std-default=<arg> 596 597.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 598 599C++ standard library to use 600 601.. option:: -sub\_library<arg> 602 603.. program:: clang1 604.. option:: -sub\_umbrella<arg> 605.. program:: clang 606 607.. option:: --sysroot=<arg>, --sysroot <arg> 608 609.. option:: --target-help 610 611.. option:: --target=<arg>, -target <arg> 612 613Generate code for the given target 614 615.. option:: --print-supported-cpus 616 617Print supported cpu models for the given target 618 619.. option:: -time 620 621Time individual commands 622 623.. option:: -traditional, --traditional 624 625.. option:: -traditional-cpp, --traditional-cpp 626 627Enable some traditional CPP emulation 628 629.. option:: -twolevel\_namespace 630 631.. program:: clang1 632.. option:: -twolevel\_namespace\_hints 633.. program:: clang 634 635.. option:: -umbrella <arg> 636 637.. option:: -unexported\_symbols\_list <arg> 638 639.. option:: -v, --verbose 640 641Show commands to run and use verbose output 642 643.. option:: --verify-debug-info 644 645Verify the binary representation of debug output 646 647.. option:: --version 648 649Print version information 650 651.. option:: -w, --no-warnings 652 653Suppress all warnings 654 655.. option:: -weak-l<arg> 656 657.. option:: -weak\_framework <arg> 658 659.. program:: clang1 660.. option:: -weak\_library <arg> 661.. program:: clang 662 663.. program:: clang2 664.. option:: -weak\_reference\_mismatches <arg> 665.. program:: clang 666 667.. option:: -whatsloaded 668 669.. option:: -whyload 670 671.. option:: -working-directory<arg>, -working-directory=<arg> 672 673Resolve file paths relative to the specified directory 674 675.. option:: -x<language>, --language <arg>, --language=<arg> 676 677Treat subsequent input files as having type <language> 678 679.. option:: -y<arg> 680 681Actions 682======= 683The action to perform on the input. 684 685.. option:: -E, --preprocess 686 687Only run the preprocessor 688 689.. option:: -S, --assemble 690 691Only run preprocess and compilation steps 692 693.. option:: -c, --compile 694 695Only run preprocess, compile, and assemble steps 696 697.. option:: -emit-llvm 698 699Use the LLVM representation for assembler and object files 700 701.. option:: -fsyntax-only 702 703.. option:: -module-file-info 704 705Provide information about a particular module file 706 707.. option:: --precompile 708 709Only precompile the input 710 711.. option:: -rewrite-objc 712 713Rewrite Objective-C source to C++ 714 715.. option:: -verify-pch 716 717Load and verify that a pre-compiled header file is not stale 718 719Compilation flags 720================= 721 722Flags controlling the behavior of Clang during compilation. These flags have 723no effect during actions that do not perform compilation. 724 725.. option:: -Xassembler <arg> 726 727Pass <arg> to the assembler 728 729.. option:: -Xclang <arg> 730 731Pass <arg> to the clang compiler 732 733.. option:: -fclang-abi-compat=<version> 734 735Attempt to match the ABI of Clang <version> 736 737.. option:: -fcomment-block-commands=<arg>,<arg2>... 738 739Treat each comma separated argument in <arg> as a documentation comment block command 740 741.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 742 743Require member pointer base types to be complete if they would be significant under the Microsoft ABI 744 745.. option:: -fcrash-diagnostics-dir=<arg> 746 747.. option:: -fdeclspec, -fno-declspec 748 749Allow \_\_declspec as a keyword 750 751.. option:: -fdepfile-entry=<arg> 752 753.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 754 755.. option:: -fdiagnostics-format=<arg> 756 757.. option:: -fdiagnostics-parseable-fixits 758 759Print fix-its in machine parseable form 760 761.. option:: -fdiagnostics-print-source-range-info 762 763Print source range spans in numeric form 764 765.. option:: -fdiagnostics-show-category=<arg> 766 767.. option:: -fdiscard-value-names, -fno-discard-value-names 768 769Discard value names in LLVM IR 770 771.. option:: -fexperimental-isel, -fno-experimental-isel 772 773Enables the experimental global instruction selector 774 775.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 776 777Enables an experimental new pass manager in LLVM. 778 779.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 780 781Use separate accesses for consecutive bitfield runs with legal widths and alignments. 782 783.. option:: -finline-functions, -fno-inline-functions 784 785Inline suitable functions 786 787.. option:: -finline-hint-functions 788 789Inline functions which are (explicitly or implicitly) marked inline 790 791.. option:: -fno-crash-diagnostics 792 793Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 794 795.. option:: -fno-sanitize-blacklist 796 797Don't use blacklist file for sanitizers 798 799.. option:: -fparse-all-comments 800 801.. option:: -frecord-command-line, -frecord-gcc-switches, -fno-record-command-line, -fno-record-gcc-switches 802 803Generate a section named ".GCC.command.line" containing the clang driver 804command-line. After linking, the section may contain multiple command lines, 805which will be individually terminated by null bytes. Separate arguments within 806a command line are combined with spaces; spaces and backslashes within an 807argument are escaped with backslashes. This format differs from the format of 808the equivalent section produced by GCC with the -frecord-gcc-switches flag. 809This option is currently only supported on ELF targets. 810 811.. option:: -fsanitize-address-field-padding=<arg> 812 813Level of field padding for AddressSanitizer 814 815.. option:: -fsanitize-address-globals-dead-stripping 816 817Enable linker dead stripping of globals in AddressSanitizer 818 819.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 820 821Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 822 823.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 824 825Enable "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. 826 827An 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. 828 829.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 830 831Enable use-after-scope detection in AddressSanitizer 832 833.. option:: -fsanitize-blacklist=<arg> 834 835Path to blacklist file for sanitizers 836 837.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 838 839Enable control flow integrity (CFI) checks for cross-DSO calls. 840 841.. option:: -fsanitize-cfi-icall-generalize-pointers 842 843Generalize pointers in CFI indirect call type signature checks 844 845.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 846 847Specify the type of coverage instrumentation for Sanitizers 848 849.. option:: -fsanitize-link-c++-runtime 850 851.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 852 853Enable origins tracking in MemorySanitizer 854 855.. program:: clang1 856.. option:: -fsanitize-memory-track-origins=<arg> 857.. program:: clang 858 859Enable origins tracking in MemorySanitizer 860 861.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 862 863Enable use-after-destroy detection in MemorySanitizer 864 865.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 866 867.. option:: -fsanitize-recover, -fno-sanitize-recover 868 869.. program:: clang1 870.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>... 871.. program:: clang 872 873Enable recovery for specified sanitizers 874 875.. option:: -fsanitize-stats, -fno-sanitize-stats 876 877Enable sanitizer statistics gathering. 878 879.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 880 881Enable atomic operations instrumentation in ThreadSanitizer (default) 882 883.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 884 885Enable function entry/exit instrumentation in ThreadSanitizer (default) 886 887.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 888 889Enable memory access instrumentation in ThreadSanitizer (default) 890 891.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>... 892 893Enable trapping for specified sanitizers 894 895.. option:: -fsanitize-undefined-strip-path-components=<number> 896 897Strip (or keep only, if negative) a given number of path components when emitting check metadata. 898 899.. option:: -fsanitize-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error 900 901.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 902 903Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 904 905.. option:: -moutline, -mno-outline 906 907Enable function outlining (AArch64 only) 908 909.. option:: --param <arg>, --param=<arg> 910 911.. option:: -std=<arg>, --std=<arg>, --std <arg> 912 913Language standard to compile for 914 915Preprocessor flags 916~~~~~~~~~~~~~~~~~~ 917 918Flags controlling the behavior of the Clang preprocessor. 919 920.. option:: -C, --comments 921 922Include comments in preprocessed output 923 924.. option:: -CC, --comments-in-macros 925 926Include comments from within macros in preprocessed output 927 928.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 929 930Define <macro> to <value> (or 1 if <value> omitted) 931 932.. option:: -H, --trace-includes 933 934Show header includes and nesting depth 935 936.. option:: -P, --no-line-commands 937 938Disable linemarker output in -E mode 939 940.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 941 942Undefine macro <macro> 943 944.. option:: -Wp,<arg>,<arg2>... 945 946Pass the comma separated arguments in <arg> to the preprocessor 947 948.. option:: -Xpreprocessor <arg> 949 950Pass <arg> to the preprocessor 951 952Include path management 953----------------------- 954 955Flags controlling how ``#include``\s are resolved to files. 956 957.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 958 959Add directory to include search path 960 961.. option:: -I-, --include-barrier 962 963Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 964 965.. option:: --cuda-path-ignore-env 966 967Ignore environment variables to detect CUDA installation 968 969.. option:: --cuda-path=<arg> 970 971CUDA installation path 972 973.. option:: -cxx-isystem<directory> 974 975Add directory to the C++ SYSTEM include search path 976 977.. option:: -fbuild-session-file=<file> 978 979Use the last modification time of <file> as the build session timestamp 980 981.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 982 983Time when the current build session started 984 985.. option:: -fmodule-file=\[<name>=\]<file> 986 987Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 988 989.. option:: -fmodules-cache-path=<directory> 990 991Specify the module cache path 992 993.. option:: -fmodules-disable-diagnostic-validation 994 995Disable validation of the diagnostic options when loading the module 996 997.. option:: -fmodules-prune-after=<seconds> 998 999Specify the interval (in seconds) after which a module file will be considered unused 1000 1001.. option:: -fmodules-prune-interval=<seconds> 1002 1003Specify the interval (in seconds) between attempts to prune the module cache 1004 1005.. option:: -fmodules-user-build-path <directory> 1006 1007Specify the module user build path 1008 1009.. option:: -fmodules-validate-once-per-build-session 1010 1011Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 1012 1013.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 1014 1015Validate the system headers that a module depends on when loading the module 1016 1017.. option:: -fprebuilt-module-path=<directory> 1018 1019Specify the prebuilt module path 1020 1021.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1022 1023Add directory to AFTER include search path 1024 1025.. option:: -iframework<arg> 1026 1027Add directory to SYSTEM framework search path 1028 1029.. option:: -iframeworkwithsysroot<directory> 1030 1031Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1032 1033.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1034 1035Include macros from file before parsing 1036 1037.. option:: -include<file>, --include<file>, --include=<arg> 1038 1039Include file before parsing 1040 1041.. option:: -include-pch <file> 1042 1043Include precompiled header file 1044 1045.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1046 1047Set the -iwithprefix/-iwithprefixbefore prefix 1048 1049.. option:: -iquote<directory> 1050 1051Add directory to QUOTE include search path 1052 1053.. option:: -isysroot<dir> 1054 1055Set the system root directory (usually /) 1056 1057.. option:: -isystem<directory> 1058 1059Add directory to SYSTEM include search path 1060 1061.. option:: -isystem-after<directory> 1062 1063Add directory to end of the SYSTEM include search path 1064 1065.. option:: -ivfsoverlay<arg> 1066 1067Overlay the virtual filesystem described by file over the real file system 1068 1069.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1070 1071Set directory to SYSTEM include search path with prefix 1072 1073.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1074 1075Set directory to include search path with prefix 1076 1077.. option:: -iwithsysroot<directory> 1078 1079Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1080 1081.. option:: --ptxas-path=<arg> 1082 1083Path to ptxas (used for compiling CUDA code) 1084 1085.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1086 1087Treat all #include paths starting with <prefix> as including a system header. 1088 1089Dependency file generation 1090-------------------------- 1091 1092Flags controlling generation of a dependency file for ``make``-like build 1093systems. 1094 1095.. option:: -M, --dependencies 1096 1097Like -MD, but also implies -E and writes to stdout by default 1098 1099.. option:: -MD, --write-dependencies 1100 1101Write a depfile containing user and system headers 1102 1103.. option:: -MF<file> 1104 1105Write depfile output from -MMD, -MD, -MM, or -M to <file> 1106 1107.. option:: -MG, --print-missing-file-dependencies 1108 1109Add missing headers to depfile 1110 1111.. option:: -MJ<arg> 1112 1113Write a compilation database entry per input 1114 1115.. option:: -MM, --user-dependencies 1116 1117Like -MMD, but also implies -E and writes to stdout by default 1118 1119.. option:: -MMD, --write-user-dependencies 1120 1121Write a depfile containing user headers 1122 1123.. option:: -MP 1124 1125Create phony target for each dependency (other than main file) 1126 1127.. option:: -MQ<arg> 1128 1129Specify name of main file output to quote in depfile 1130 1131.. option:: -MT<arg> 1132 1133Specify name of main file output in depfile 1134 1135.. option:: -MV 1136 1137Use NMake/Jom format for the depfile 1138 1139Dumping preprocessor state 1140-------------------------- 1141 1142Flags allowing the state of the preprocessor to be dumped in various ways. 1143 1144.. option:: -d 1145 1146.. program:: clang1 1147.. option:: -d<arg> 1148.. program:: clang 1149 1150.. option:: -dD 1151 1152Print macro definitions in -E mode in addition to normal output 1153 1154.. option:: -dI 1155 1156Print include directives in -E mode in addition to normal output 1157 1158.. option:: -dM 1159 1160Print macro definitions in -E mode instead of normal output 1161 1162Diagnostic flags 1163~~~~~~~~~~~~~~~~ 1164 1165Flags controlling which warnings, errors, and remarks Clang will generate. 1166See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1167 1168.. option:: -R<remark> 1169 1170Enable the specified remark 1171 1172.. option:: -Rpass-analysis=<arg> 1173 1174Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1175 1176.. option:: -Rpass-missed=<arg> 1177 1178Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1179 1180.. option:: -Rpass=<arg> 1181 1182Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1183 1184.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1185 1186Enable the specified warning 1187 1188.. option:: -Wdeprecated, -Wno-deprecated 1189 1190Enable warnings for deprecated constructs and define \_\_DEPRECATED 1191 1192.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1193 1194Target-independent compilation options 1195~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1196.. option:: -Wframe-larger-than=<arg> 1197 1198.. option:: -fPIC, -fno-PIC 1199 1200.. option:: -fPIE, -fno-PIE 1201 1202.. option:: -faccess-control, -fno-access-control 1203 1204.. option:: -faddrsig, -fno-addrsig 1205 1206Emit an address-significance table 1207 1208.. option:: -falign-functions, -fno-align-functions 1209 1210.. program:: clang1 1211.. option:: -falign-functions=<arg> 1212.. program:: clang 1213 1214.. program:: clang1 1215.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1216.. program:: clang 1217 1218Enable C++17 aligned allocation functions 1219 1220.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1221 1222Treat editor placeholders as valid source code 1223 1224.. option:: -fallow-unsupported 1225 1226.. option:: -faltivec, -fno-altivec 1227 1228.. option:: -fansi-escape-codes 1229 1230Use ANSI escape codes for diagnostics 1231 1232.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1233 1234Use Apple's kernel extensions ABI 1235 1236.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1237 1238Enable Apple gcc-compatible #pragma pack handling 1239 1240.. option:: -fapplication-extension, -fno-application-extension 1241 1242Restrict code to those available for App Extensions 1243 1244.. option:: -fasm, -fno-asm 1245 1246.. option:: -fasm-blocks, -fno-asm-blocks 1247 1248.. option:: -fassociative-math, -fno-associative-math 1249 1250.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1251 1252.. option:: -fast 1253 1254.. option:: -fastcp 1255 1256.. option:: -fastf 1257 1258.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1259 1260.. option:: -fautolink, -fno-autolink 1261 1262.. option:: -fblocks, -fno-blocks 1263 1264Enable the 'blocks' language feature 1265 1266.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1267 1268.. option:: -fborland-extensions, -fno-borland-extensions 1269 1270Accept non-standard constructs supported by the Borland compiler 1271 1272.. option:: -fbracket-depth=<arg> 1273 1274.. option:: -fbuiltin, -fno-builtin 1275 1276.. option:: -fbuiltin-module-map 1277 1278Load the clang builtins module map file. 1279 1280.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1281 1282Enable C++ static destructor registration (the default) 1283 1284.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1285 1286.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1287 1288Instrument control-flow architecture protection. Options: return, branch, full, none. 1289 1290.. option:: -fchar8\_t, -fno-char8\_t 1291 1292Enable C++ builtin type char8\_t 1293 1294.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1295 1296.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1297 1298Use colors in diagnostics 1299 1300.. option:: -fcommon, -fno-common 1301 1302.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1303 1304.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1305 1306.. option:: -fconstant-string-class=<arg> 1307 1308.. option:: -fconstexpr-backtrace-limit=<arg> 1309 1310.. option:: -fconstexpr-depth=<arg> 1311 1312.. option:: -fconstexpr-steps=<arg> 1313 1314.. option:: -fcoroutines-ts, -fno-coroutines-ts 1315 1316Enable support for the C++ Coroutines TS 1317 1318.. option:: -fcoverage-mapping, -fno-coverage-mapping 1319 1320Generate coverage mapping to enable code coverage analysis 1321 1322.. option:: -fcreate-profile 1323 1324.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1325 1326Enable C++ exceptions 1327 1328.. option:: -fcxx-modules, -fno-cxx-modules 1329 1330.. option:: -fdata-sections, -fno-data-sections 1331 1332Place each data in its own section (ELF Only) 1333 1334.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1335 1336Emit extra debug info to make sample profile more accurate. 1337 1338.. option:: -fdebug-macro, -fno-debug-macro 1339 1340Emit macro debug information 1341 1342.. option:: -fdebug-pass-arguments 1343 1344.. option:: -fdebug-pass-structure 1345 1346.. option:: -fdebug-prefix-map=<arg> 1347 1348remap file source paths in debug info 1349 1350.. option:: -fdebug-types-section, -fno-debug-types-section 1351 1352Place debug types in their own section (ELF Only) 1353 1354.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1355 1356Parse templated function definitions at the end of the translation unit 1357 1358.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1359 1360Treat usage of null pointers as undefined behavior. 1361 1362.. option:: -fdenormal-fp-math=<arg> 1363 1364.. option:: -fdiagnostics-absolute-paths 1365 1366Print absolute paths in diagnostics 1367 1368.. option:: -fdiagnostics-color, -fno-diagnostics-color 1369 1370.. program:: clang1 1371.. option:: -fdiagnostics-color=<arg> 1372.. program:: clang 1373 1374.. option:: -fdiagnostics-hotness-threshold=<number> 1375 1376Prevent optimization remarks from being output if they do not have at least this profile count 1377 1378.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1379 1380Enable profile hotness information in diagnostic line 1381 1382.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1383 1384Display include stacks for diagnostic notes 1385 1386.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1387 1388Print option name with mappable diagnostics 1389 1390.. option:: -fdiagnostics-show-template-tree 1391 1392Print a template comparison tree for differing templates 1393 1394.. option:: -fdigraphs, -fno-digraphs 1395 1396Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1397 1398.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1399 1400Allow '$' in identifiers 1401 1402.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1403 1404Enable '\[\[\]\]' attributes in all C and C++ language modes 1405 1406.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1407 1408.. option:: -fdwarf-exceptions 1409 1410Use DWARF style exceptions 1411 1412.. option:: -felide-constructors, -fno-elide-constructors 1413 1414.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1415 1416.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1417 1418Embed LLVM bitcode (option: off, all, bitcode, marker) 1419 1420.. option:: -femit-all-decls 1421 1422Emit all declarations, even if unused 1423 1424.. option:: -femulated-tls, -fno-emulated-tls 1425 1426Use emutls functions to access thread\_local variables 1427 1428.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1429 1430.. option:: -ferror-limit=<arg> 1431 1432.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1433 1434.. option:: -fexceptions, -fno-exceptions 1435 1436Enable support for exception handling 1437 1438.. option:: -fexec-charset=<arg> 1439 1440.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1441 1442.. option:: -ffast-math, -fno-fast-math 1443 1444Allow aggressive, lossy floating-point optimizations 1445 1446.. option:: -ffinite-math-only, -fno-finite-math-only 1447 1448.. option:: -ffixed-point, -fno-fixed-point 1449 1450Enable fixed point types 1451 1452.. option:: -ffor-scope, -fno-for-scope 1453 1454.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1455 1456Emits more virtual tables to improve devirtualization 1457 1458.. option:: -fforce-enable-int128, -fno-force-enable-int128 1459 1460Enable support for int128\_t type 1461 1462.. option:: -ffp-contract=<arg> 1463 1464Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma, default) \| off (never fuse) 1465 1466.. option:: -ffreestanding 1467 1468Assert that the compilation takes place in a freestanding environment 1469 1470.. option:: -ffunction-sections, -fno-function-sections 1471 1472Place each function in its own section (ELF Only) 1473 1474.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1475 1476.. option:: -fgnu-keywords, -fno-gnu-keywords 1477 1478Allow GNU-extension keywords regardless of language standard 1479 1480.. option:: -fgnu-runtime 1481 1482Generate output compatible with the standard GNU Objective-C runtime 1483 1484.. option:: -fgnu89-inline, -fno-gnu89-inline 1485 1486Use the gnu89 inline semantics 1487 1488.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1489 1490.. option:: -fhonor-nans, -fno-honor-nans 1491 1492.. option:: -fhosted 1493 1494.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1495 1496Implicitly search the file system for module map files. 1497 1498.. option:: -fimplicit-modules, -fno-implicit-modules 1499 1500.. option:: -finput-charset=<arg> 1501 1502.. option:: -finstrument-function-entry-bare 1503 1504Instrument function entry only, after inlining, without arguments to the instrumentation call 1505 1506.. option:: -finstrument-functions 1507 1508Generate calls to instrument function entry and exit 1509 1510.. option:: -finstrument-functions-after-inlining 1511 1512Like -finstrument-functions, but insert the calls after inlining 1513 1514.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1515 1516Enable the integrated assembler 1517 1518.. option:: -fjump-tables, -fno-jump-tables 1519 1520.. option:: -fkeep-static-consts 1521 1522Keep static const variables even if unused 1523 1524.. option:: -flax-vector-conversions, -fno-lax-vector-conversions 1525 1526.. option:: -flimited-precision=<arg> 1527 1528.. option:: -flto, -fno-lto 1529 1530Enable LTO in 'full' mode 1531 1532.. option:: -flto-jobs=<arg> 1533 1534Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1535 1536.. program:: clang1 1537.. option:: -flto=<arg> 1538.. program:: clang 1539 1540Set LTO mode to either 'full' or 'thin' 1541 1542.. option:: -fmacro-backtrace-limit=<arg> 1543 1544.. option:: -fmath-errno, -fno-math-errno 1545 1546Require math functions to indicate errors by setting errno 1547 1548.. option:: -fmax-type-align=<arg> 1549 1550Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1551 1552.. option:: -fmerge-all-constants, -fno-merge-all-constants 1553 1554Allow merging of constants 1555 1556.. option:: -fmessage-length=<arg> 1557 1558.. option:: -fmodule-file-deps, -fno-module-file-deps 1559 1560.. option:: -fmodule-map-file=<file> 1561 1562Load this module map file 1563 1564.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1565 1566Specify the name of the module to build 1567 1568.. option:: -fmodules, -fno-modules 1569 1570Enable the 'modules' language feature 1571 1572.. option:: -fmodules-decluse, -fno-modules-decluse 1573 1574Require declaration of modules used within a module 1575 1576.. option:: -fmodules-ignore-macro=<arg> 1577 1578Ignore the definition of the given macro when building and loading modules 1579 1580.. option:: -fmodules-search-all, -fno-modules-search-all 1581 1582Search even non-imported modules to resolve references 1583 1584.. option:: -fmodules-strict-decluse 1585 1586Like -fmodules-decluse but requires all headers to be in modules 1587 1588.. option:: -fmodules-ts 1589 1590Enable support for the C++ Modules TS 1591 1592.. option:: -fms-compatibility, -fno-ms-compatibility 1593 1594Enable full Microsoft Visual C++ compatibility 1595 1596.. option:: -fms-compatibility-version=<arg> 1597 1598Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1599 1600.. option:: -fms-extensions, -fno-ms-extensions 1601 1602Accept some non-standard constructs supported by the Microsoft compiler 1603 1604.. option:: -fms-memptr-rep=<arg> 1605 1606.. option:: -fms-volatile<arg> 1607 1608.. option:: -fmsc-version=<arg> 1609 1610Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1611 1612.. option:: -fmudflap 1613 1614.. option:: -fmudflapth 1615 1616.. option:: -fnested-functions 1617 1618.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1619 1620Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1621 1622.. option:: -fnext-runtime 1623 1624.. option:: -fno-builtin-<arg> 1625 1626Disable implicit builtin knowledge of a specific function 1627 1628.. option:: -fno-elide-type 1629 1630Do not elide types when printing diagnostics 1631 1632.. option:: -fno-max-type-align 1633 1634.. option:: -fno-operator-names 1635 1636Do not treat C++ operator name keywords as synonyms for operators 1637 1638.. option:: -fno-rtti-data 1639 1640Control emission of RTTI data 1641 1642.. option:: -fno-strict-modules-decluse 1643 1644.. option:: -fno-working-directory 1645 1646.. option:: -fnoxray-link-deps 1647 1648.. option:: -fobjc-abi-version=<arg> 1649 1650.. option:: -fobjc-arc, -fno-objc-arc 1651 1652Synthesize retain and release calls for Objective-C pointers 1653 1654.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1655 1656Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1657 1658.. option:: -fobjc-exceptions, -fno-objc-exceptions 1659 1660Enable Objective-C exceptions 1661 1662.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1663 1664.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1665 1666.. option:: -fobjc-link-runtime 1667 1668.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1669 1670.. option:: -fobjc-nonfragile-abi-version=<arg> 1671 1672.. option:: -fobjc-runtime=<arg> 1673 1674Specify the target Objective-C runtime kind and version 1675 1676.. option:: -fobjc-sender-dependent-dispatch 1677 1678.. option:: -fobjc-weak, -fno-objc-weak 1679 1680Enable ARC-style weak references in Objective-C 1681 1682.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1683 1684.. option:: -fopenmp, -fno-openmp 1685 1686Parse OpenMP pragmas and generate parallel code. 1687 1688.. option:: -fopenmp-simd, -fno-openmp-simd 1689 1690Emit OpenMP code only for SIMD-based constructs. 1691 1692.. option:: -fopenmp-version=<arg> 1693 1694.. program:: clang1 1695.. option:: -fopenmp=<arg> 1696.. program:: clang 1697 1698.. option:: -foperator-arrow-depth=<arg> 1699 1700.. option:: -foptimization-record-file=<arg> 1701 1702Specify the file name of any generated YAML optimization record 1703 1704.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1705 1706.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1707 1708.. option:: -fpack-struct, -fno-pack-struct 1709 1710.. program:: clang1 1711.. option:: -fpack-struct=<arg> 1712.. program:: clang 1713 1714Specify the default maximum struct packing alignment 1715 1716.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1717 1718Recognize and construct Pascal-style string literals 1719 1720.. option:: -fpcc-struct-return 1721 1722Override the default ABI to return all structs on the stack 1723 1724.. option:: -fpch-preprocess 1725 1726.. option:: -fpic, -fno-pic 1727 1728.. option:: -fpie, -fno-pie 1729 1730.. option:: -fplt, -fno-plt 1731 1732Use the PLT to make function calls 1733 1734.. option:: -fplugin=<dsopath> 1735 1736Load the named plugin (dynamic shared object) 1737 1738.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1739 1740.. option:: -fprofile-arcs, -fno-profile-arcs 1741 1742.. option:: -fprofile-dir=<arg> 1743 1744.. option:: -fprofile-generate, -fno-profile-generate 1745 1746Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1747 1748.. program:: clang1 1749.. option:: -fprofile-generate=<directory> 1750.. program:: clang 1751 1752Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1753 1754.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1755 1756Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1757 1758.. program:: clang1 1759.. option:: -fprofile-instr-generate=<file> 1760.. program:: clang 1761 1762Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1763 1764.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1765 1766.. program:: clang1 1767.. option:: -fprofile-instr-use=<arg> 1768.. program:: clang 1769 1770Use instrumentation data for profile-guided optimization 1771 1772.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1773 1774Specifies that the sample profile is accurate. If the sample 1775 profile is accurate, callsites without profile samples are marked 1776 as cold. Otherwise, treat callsites without profile samples as if 1777 we have no profile 1778 1779.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 1780 1781.. program:: clang1 1782.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 1783.. program:: clang 1784 1785Enable sample-based profile guided optimizations 1786 1787.. program:: clang1 1788.. option:: -fprofile-use=<pathname> 1789.. program:: clang 1790 1791Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 1792 1793.. option:: -freciprocal-math, -fno-reciprocal-math 1794 1795Allow division operations to be reassociated 1796 1797.. option:: -freg-struct-return 1798 1799Override the default ABI to return small structs in registers 1800 1801.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 1802 1803Use atexit or \_\_cxa\_atexit to register global destructors 1804 1805.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 1806 1807Enable C++17 relaxed template template argument matching 1808 1809.. option:: -freroll-loops, -fno-reroll-loops 1810 1811Turn on loop reroller 1812 1813.. option:: -fretain-comments-from-system-headers 1814 1815.. option:: -frewrite-imports, -fno-rewrite-imports 1816 1817.. option:: -frewrite-includes, -fno-rewrite-includes 1818 1819.. option:: -frewrite-map-file <arg> 1820 1821.. program:: clang1 1822.. option:: -frewrite-map-file=<arg> 1823.. program:: clang 1824 1825.. option:: -fropi, -fno-ropi 1826 1827.. option:: -frtti, -fno-rtti 1828 1829.. option:: -frwpi, -fno-rwpi 1830 1831.. option:: -fsave-optimization-record, -fno-save-optimization-record 1832 1833Generate a YAML optimization record file 1834 1835.. option:: -fseh-exceptions 1836 1837Use SEH style exceptions 1838 1839.. option:: -fshort-enums, -fno-short-enums 1840 1841Allocate to an enum type only as many bytes as it needs for the declared range of possible values 1842 1843.. option:: -fshort-wchar, -fno-short-wchar 1844 1845Force wchar\_t to be a short unsigned int 1846 1847.. option:: -fshow-column, -fno-show-column 1848 1849.. option:: -fshow-overloads=<arg> 1850 1851Which overload candidates to show when overload resolution fails: best\|all; defaults to all 1852 1853.. option:: -fshow-source-location, -fno-show-source-location 1854 1855.. option:: -fsignaling-math, -fno-signaling-math 1856 1857.. option:: -fsigned-bitfields 1858 1859.. option:: -fsigned-char, -fno-signed-char, --signed-char 1860 1861.. option:: -fsigned-zeros, -fno-signed-zeros 1862 1863.. option:: -fsized-deallocation, -fno-sized-deallocation 1864 1865Enable C++14 sized global deallocation functions 1866 1867.. option:: -fsjlj-exceptions 1868 1869Use SjLj style exceptions 1870 1871.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 1872 1873Enable the superword-level parallelism vectorization passes 1874 1875.. option:: -fspell-checking, -fno-spell-checking 1876 1877.. option:: -fspell-checking-limit=<arg> 1878 1879.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 1880 1881Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 1882 1883.. option:: -fsplit-stack 1884 1885.. option:: -fstack-protector, -fno-stack-protector 1886 1887Enable stack protectors for functions potentially vulnerable to stack smashing 1888 1889.. option:: -fstack-protector-all 1890 1891Force the usage of stack protectors for all functions 1892 1893.. option:: -fstack-protector-strong 1894 1895Use a strong heuristic to apply stack protectors to functions 1896 1897.. option:: -fstack-size-section, -fno-stack-size-section 1898 1899Emit section containing metadata on function stack sizes 1900 1901.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 1902 1903Emit full debug info for all types used by the program 1904 1905.. option:: -fstrict-aliasing, -fno-strict-aliasing 1906 1907.. option:: -fstrict-enums, -fno-strict-enums 1908 1909Enable optimizations based on the strict definition of an enum's value range 1910 1911.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 1912 1913Assume that overflowing float-to-int casts are undefined (default) 1914 1915.. option:: -fstrict-overflow, -fno-strict-overflow 1916 1917.. option:: -fstrict-return, -fno-strict-return 1918 1919Always treat control flow paths that fall off the end of a non-void function as unreachable 1920 1921.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 1922 1923Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 1924 1925.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 1926 1927.. option:: -ftabstop=<arg> 1928 1929.. option:: -ftemplate-backtrace-limit=<arg> 1930 1931.. option:: -ftemplate-depth-<arg> 1932 1933.. option:: -ftemplate-depth=<arg> 1934 1935.. option:: -ftest-coverage 1936 1937.. option:: -fthinlto-index=<arg> 1938 1939Perform ThinLTO importing using provided function summary index 1940 1941.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 1942 1943.. option:: -ftime-report 1944 1945.. option:: -ftime-trace 1946 1947Turn on time profiler 1948 1949.. option:: -ftime-trace-granularity=<arg> 1950 1951Minimum time granularity (in microseconds) traced by time profiler 1952 1953.. option:: -ftls-model=<arg> 1954 1955.. option:: -ftrap-function=<arg> 1956 1957Issue call to specified function rather than a trap instruction 1958 1959.. option:: -ftrapping-math, -fno-trapping-math 1960 1961.. option:: -ftrapv 1962 1963Trap on integer overflow 1964 1965.. option:: -ftrapv-handler <arg> 1966 1967.. program:: clang1 1968.. option:: -ftrapv-handler=<function name> 1969.. program:: clang 1970 1971Specify the function to be called on overflow 1972 1973.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 1974 1975Process trigraph sequences 1976 1977.. option:: -funique-section-names, -fno-unique-section-names 1978 1979Use unique names for text and data sections (ELF Only) 1980 1981.. option:: -funit-at-a-time, -fno-unit-at-a-time 1982 1983.. option:: -funroll-loops, -fno-unroll-loops 1984 1985Turn on loop unroller 1986 1987.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 1988 1989.. option:: -funsigned-bitfields 1990 1991.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 1992 1993.. option:: -funwind-tables, -fno-unwind-tables 1994 1995.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 1996 1997.. option:: -fuse-init-array, -fno-use-init-array 1998 1999Use .init\_array instead of .ctors 2000 2001.. option:: -fuse-ld=<arg> 2002 2003.. option:: -fuse-line-directives, -fno-use-line-directives 2004 2005.. option:: -fveclib=<arg> 2006 2007Use the given vector functions library 2008 2009.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2010 2011Enable the loop vectorization passes 2012 2013.. option:: -fverbose-asm, -fno-verbose-asm, -dA 2014 2015.. option:: -fvisibility-inlines-hidden 2016 2017Give inline C++ member functions hidden visibility by default 2018 2019.. option:: -fvisibility-ms-compat 2020 2021Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2022 2023.. option:: -fvisibility=<arg> 2024 2025Set the default symbol visibility for all global declarations 2026 2027.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2028 2029Enables whole-program vtable optimization. Requires -flto 2030 2031.. option:: -fwrapv, -fno-wrapv 2032 2033Treat signed integer overflow as two's complement 2034 2035.. option:: -fwritable-strings 2036 2037Store string literals as writable data 2038 2039.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2040 2041Determine whether to always emit \_\_xray\_customevent(...) calls even if the function it appears in is not always instrumented. 2042 2043.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2044 2045Determine whether to always emit \_\_xray\_typedevent(...) calls even if the function it appears in is not always instrumented. 2046 2047.. option:: -fxray-always-instrument=<arg> 2048 2049DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2050 2051.. option:: -fxray-attr-list=<arg> 2052 2053Filename defining the list of functions/types for imbuing XRay attributes. 2054 2055.. option:: -fxray-instruction-threshold<arg> 2056 2057.. program:: clang1 2058.. option:: -fxray-instruction-threshold=<arg> 2059.. program:: clang 2060 2061Sets the minimum function size to instrument with XRay 2062 2063.. option:: -fxray-instrument, -fno-xray-instrument 2064 2065Generate XRay instrumentation sleds on function entry and exit 2066 2067.. option:: -fxray-instrumentation-bundle=<arg> 2068 2069Select which XRay instrumentation points to emit. Options: all, none, function, custom. Default is 'all'. 2070 2071.. option:: -fxray-link-deps 2072 2073Tells clang to add the link dependencies for XRay. 2074 2075.. option:: -fxray-modes=<arg> 2076 2077List of modes to link in by default into XRay instrumented binaries. 2078 2079.. option:: -fxray-never-instrument=<arg> 2080 2081DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2082 2083.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2084 2085.. option:: -fzvector, -fno-zvector, -mzvector 2086 2087Enable System z vector language extension 2088 2089.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2090 2091.. option:: -pedantic-errors, --pedantic-errors 2092 2093OpenCL flags 2094------------ 2095.. option:: -cl-denorms-are-zero 2096 2097OpenCL only. Allow denormals to be flushed to zero. 2098 2099.. option:: -cl-fast-relaxed-math 2100 2101OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2102 2103.. option:: -cl-finite-math-only 2104 2105OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2106 2107.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2108 2109OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2110 2111.. option:: -cl-kernel-arg-info 2112 2113OpenCL only. Generate kernel argument metadata. 2114 2115.. option:: -cl-mad-enable 2116 2117OpenCL only. Allow use of less precise MAD computations in the generated binary. 2118 2119.. option:: -cl-no-signed-zeros 2120 2121OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2122 2123.. option:: -cl-opt-disable 2124 2125OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2126 2127.. option:: -cl-single-precision-constant 2128 2129OpenCL only. Treat double precision floating-point constant as single precision constant. 2130 2131.. option:: -cl-std=<arg> 2132 2133OpenCL language standard to compile for. 2134 2135.. option:: -cl-strict-aliasing 2136 2137OpenCL only. This option is added for compatibility with OpenCL 1.0. 2138 2139.. option:: -cl-uniform-work-group-size 2140 2141OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2142 2143.. option:: -cl-unsafe-math-optimizations 2144 2145OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2146 2147Target-dependent compilation options 2148~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2149.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg> 2150 2151Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2152 2153.. option:: -m16 2154 2155.. option:: -m32 2156 2157.. option:: -m64 2158 2159.. option:: -mabi=<arg> 2160 2161.. option:: -malign-double 2162 2163Align doubles to two words in structs (x86 only) 2164 2165.. option:: -march=<arg> 2166 2167.. option:: -masm=<arg> 2168 2169.. option:: -mbackchain, -mno-backchain 2170 2171Link stack frames through backchain on System Z 2172 2173.. option:: -mcmodel=<arg> 2174 2175.. option:: -mconsole<arg> 2176 2177.. 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) 2178 2179Use -mcpu=? to see a list of supported cpu models. 2180 2181.. option:: -mcrc, -mno-crc 2182 2183Allow use of CRC instructions (ARM/Mips only) 2184 2185.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2186 2187.. option:: -mdll<arg> 2188 2189.. option:: -mdynamic-no-pic<arg> 2190 2191.. option:: -meabi <arg> 2192 2193Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2194 2195.. option:: -mfentry 2196 2197Insert calls to fentry at function entry (x86 only) 2198 2199.. option:: -mfloat-abi=<arg> 2200 2201.. option:: -mfpmath=<arg> 2202 2203.. option:: -mfpu=<arg> 2204 2205.. option:: -mglobal-merge, -mno-global-merge 2206 2207Enable merging of globals 2208 2209.. option:: -mhard-float 2210 2211.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2212 2213.. option:: -miamcu, -mno-iamcu 2214 2215Use Intel MCU ABI 2216 2217.. option:: -mimplicit-float, -mno-implicit-float 2218 2219.. option:: -mimplicit-it=<arg> 2220 2221.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2222 2223(integrated-as) Emit an object file which can be used with an incremental linker 2224 2225.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2226 2227.. option:: -mkernel 2228 2229.. option:: -mlong-calls, -mno-long-calls 2230 2231Generate branches with extended addressability, usually via indirect jumps. 2232 2233.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2234 2235Set macOS deployment target 2236 2237.. option:: -mmcu=<arg> 2238 2239.. option:: -mms-bitfields, -mno-ms-bitfields 2240 2241Set the default structure layout to be compatible with the Microsoft compiler standard 2242 2243.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2244 2245Omit frame pointer setup for leaf functions 2246 2247.. option:: -moslib=<arg> 2248 2249.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2250 2251Use copy relocations support for PIE builds 2252 2253.. option:: -mprefer-vector-width=<arg> 2254 2255Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2256 2257.. option:: -mqdsp6-compat 2258 2259Enable hexagon-qdsp6 backward compatibility 2260 2261.. option:: -mrecip 2262 2263.. program:: clang1 2264.. option:: -mrecip=<arg1>,<arg2>... 2265.. program:: clang 2266 2267.. option:: -mred-zone, -mno-red-zone 2268 2269.. option:: -mregparm=<arg> 2270 2271.. option:: -mrelax-all, -mno-relax-all 2272 2273(integrated-as) Relax all machine instructions 2274 2275.. option:: -mretpoline, -mno-retpoline 2276 2277.. option:: -mrtd, -mno-rtd 2278 2279Make StdCall calling convention the default 2280 2281.. option:: -msign-return-address=<arg> 2282 2283Select return address signing scope 2284 2285.. option:: -msoft-float, -mno-soft-float 2286 2287Use software floating point 2288 2289.. option:: -mstack-alignment=<arg> 2290 2291Set the stack alignment 2292 2293.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2294 2295Enable stack probes 2296 2297.. option:: -mstack-probe-size=<arg> 2298 2299Set the stack probe size 2300 2301.. option:: -mstackrealign, -mno-stackrealign 2302 2303Force realign the stack at entry to every function 2304 2305.. option:: -mthread-model <arg> 2306 2307The thread model to use, e.g. posix, single (posix by default) 2308 2309.. option:: -mthreads<arg> 2310 2311.. option:: -mthumb, -mno-thumb 2312 2313.. option:: -mtune=<arg> 2314 2315Use -mtune=? to see a list of supported cpu models. 2316 2317.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2318 2319.. option:: -municode<arg> 2320 2321.. option:: -mvx, -mno-vx 2322 2323.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2324 2325.. option:: -mwatchos-version-min=<arg> 2326 2327.. option:: -mwindows<arg> 2328 2329.. option:: -mx32 2330 2331AARCH64 2332------- 2333.. option:: -ffixed-x1 2334 2335Reserve the x1 register (AArch64 only) 2336 2337.. option:: -ffixed-x2 2338 2339Reserve the x2 register (AArch64 only) 2340 2341.. option:: -ffixed-x3 2342 2343Reserve the x3 register (AArch64 only) 2344 2345.. option:: -ffixed-x4 2346 2347Reserve the x4 register (AArch64 only) 2348 2349.. option:: -ffixed-x5 2350 2351Reserve the x5 register (AArch64 only) 2352 2353.. option:: -ffixed-x6 2354 2355Reserve the x6 register (AArch64 only) 2356 2357.. option:: -ffixed-x7 2358 2359Reserve the x7 register (AArch64 only) 2360 2361.. option:: -ffixed-x18 2362 2363Reserve the x18 register (AArch64 only) 2364 2365.. option:: -ffixed-x20 2366 2367Reserve the x20 register (AArch64 only) 2368 2369.. option:: -fcall-saved-x8 2370 2371Make the x8 register call-saved (AArch64 only) 2372 2373.. option:: -fcall-saved-x9 2374 2375Make the x9 register call-saved (AArch64 only) 2376 2377.. option:: -fcall-saved-x10 2378 2379Make the x10 register call-saved (AArch64 only) 2380 2381.. option:: -fcall-saved-x11 2382 2383Make the x11 register call-saved (AArch64 only) 2384 2385.. option:: -fcall-saved-x12 2386 2387Make the x12 register call-saved (AArch64 only) 2388 2389.. option:: -fcall-saved-x13 2390 2391Make the x13 register call-saved (AArch64 only) 2392 2393.. option:: -fcall-saved-x14 2394 2395Make the x14 register call-saved (AArch64 only) 2396 2397.. option:: -fcall-saved-x15 2398 2399Make the x15 register call-saved (AArch64 only) 2400 2401.. option:: -fcall-saved-x18 2402 2403Make the x18 register call-saved (AArch64 only) 2404 2405.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2406 2407Workaround Cortex-A53 erratum 835769 (AArch64 only) 2408 2409.. option:: -mgeneral-regs-only 2410 2411Generate code which only uses the general purpose registers (AArch64 only) 2412 2413AMDGPU 2414------ 2415.. option:: -mcumode, -mno-cumode 2416 2417CU wavefront execution mode is used if enabled and WGP wavefront execution mode 2418is used if disabled (AMDGPU only) 2419 2420.. option:: -mwavefrontsize64, -mno-wavefrontsize64 2421 2422Wavefront size 64 is used if enabled and wavefront size 32 if disabled (AMDGPU only) 2423 2424.. option:: -mxnack, -mno-xnack 2425 2426Enable XNACK (AMDGPU only) 2427 2428ARM 2429--- 2430.. option:: -ffixed-r9 2431 2432Reserve the r9 register (ARM only) 2433 2434.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2435 2436Disallow generation of data access to code sections (ARM only) 2437 2438.. option:: -mno-movt 2439 2440Disallow use of movt/movw pairs (ARM only) 2441 2442.. option:: -mno-neg-immediates 2443 2444Disallow converting instructions with negative immediates to their negation or inversion. 2445 2446.. option:: -mnocrc 2447 2448Disallow use of CRC instructions (ARM only) 2449 2450.. option:: -mrestrict-it, -mno-restrict-it 2451 2452Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2453 2454.. option:: -mtp=<arg> 2455 2456Read thread pointer from coprocessor register (ARM only) 2457 2458.. option:: -munaligned-access, -mno-unaligned-access 2459 2460Allow memory accesses to be unaligned (AArch32/AArch64 only) 2461 2462Hexagon 2463------- 2464.. option:: -mieee-rnd-near 2465 2466.. option:: -mmemops, -mno-memops 2467 2468Enable generation of memop instructions 2469 2470.. option:: -mnvj, -mno-nvj 2471 2472Enable generation of new-value jumps 2473 2474.. option:: -mnvs, -mno-nvs 2475 2476Enable generation of new-value stores 2477 2478.. option:: -mpackets, -mno-packets 2479 2480Enable generation of instruction packets 2481 2482Hexagon 2483------- 2484.. option:: -mhvx, -mno-hvx 2485 2486Enable Hexagon Vector eXtensions 2487 2488.. option:: -mhvx-length=<arg> 2489 2490Set Hexagon Vector Length 2491 2492.. program:: clang1 2493.. option:: -mhvx=<arg> 2494.. program:: clang 2495 2496Enable Hexagon Vector eXtensions 2497 2498MIPS 2499---- 2500.. option:: -mabicalls, -mno-abicalls 2501 2502Enable SVR4-style position-independent code (Mips only) 2503 2504.. option:: -mabs=<arg> 2505 2506.. option:: -mcheck-zero-division, -mno-check-zero-division 2507 2508.. option:: -mcompact-branches=<arg> 2509 2510.. option:: -mdouble-float 2511 2512.. option:: -mdsp, -mno-dsp 2513 2514.. option:: -mdspr2, -mno-dspr2 2515 2516.. option:: -membedded-data, -mno-embedded-data 2517 2518Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 2519 2520.. option:: -mextern-sdata, -mno-extern-sdata 2521 2522Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 2523 2524.. option:: -mfp32 2525 2526Use 32-bit floating point registers (MIPS only) 2527 2528.. option:: -mfp64 2529 2530Use 64-bit floating point registers (MIPS only) 2531 2532.. option:: -mginv, -mno-ginv 2533 2534.. option:: -mgpopt, -mno-gpopt 2535 2536Use GP relative accesses for symbols known to be in a small data section (MIPS) 2537 2538.. option:: -mindirect-jump=<arg> 2539 2540Change indirect jump instructions to inhibit speculation 2541 2542.. option:: -mips16 2543 2544.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 2545 2546.. option:: -mlocal-sdata, -mno-local-sdata 2547 2548Extend the -G behaviour to object local data (MIPS) 2549 2550.. option:: -mmadd4, -mno-madd4 2551 2552Enable the generation of 4-operand madd.s, madd.d and related instructions. 2553 2554.. option:: -mmicromips, -mno-micromips 2555 2556.. option:: -mmsa, -mno-msa 2557 2558Enable MSA ASE (MIPS only) 2559 2560.. option:: -mmt, -mno-mt 2561 2562Enable MT ASE (MIPS only) 2563 2564.. option:: -mnan=<arg> 2565 2566.. option:: -mno-mips16 2567 2568.. option:: -msingle-float 2569 2570.. option:: -mvirt, -mno-virt 2571 2572.. option:: -mxgot, -mno-xgot 2573 2574PowerPC 2575------- 2576.. option:: -maltivec, -mno-altivec 2577 2578.. option:: -mcmpb, -mno-cmpb 2579 2580.. option:: -mcrbits, -mno-crbits 2581 2582.. option:: -mcrypto, -mno-crypto 2583 2584.. option:: -mdirect-move, -mno-direct-move 2585 2586.. option:: -mfloat128, -mno-float128 2587 2588.. option:: -mfprnd, -mno-fprnd 2589 2590.. option:: -mhtm, -mno-htm 2591 2592.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 2593 2594.. option:: -misel, -mno-isel 2595 2596.. option:: -mlongcall, -mno-longcall 2597 2598.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 2599 2600.. option:: -mpopcntd, -mno-popcntd 2601 2602.. option:: -mpower8-vector, -mno-power8-vector 2603 2604.. option:: -mpower9-vector, -mno-power9-vector 2605 2606.. option:: -mqpx, -mno-qpx 2607 2608.. option:: -msecure-plt 2609 2610.. option:: -mvsx, -mno-vsx 2611 2612WebAssembly 2613----------- 2614.. option:: -mexception-handling, -mno-exception-handling 2615 2616.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 2617 2618.. option:: -msign-ext, -mno-sign-ext 2619 2620.. option:: -msimd128, -mno-simd128 2621 2622X86 2623--- 2624.. option:: -m3dnow, -mno-3dnow 2625 2626.. option:: -m3dnowa, -mno-3dnowa 2627 2628.. option:: -madx, -mno-adx 2629 2630.. option:: -maes, -mno-aes 2631 2632.. option:: -mavx, -mno-avx 2633 2634.. option:: -mavx2, -mno-avx2 2635 2636.. option:: -mavx512bitalg, -mno-avx512bitalg 2637 2638.. option:: -mavx512bf16, -mno-avx512bf16 2639 2640.. option:: -mavx512bw, -mno-avx512bw 2641 2642.. option:: -mavx512cd, -mno-avx512cd 2643 2644.. option:: -mavx512dq, -mno-avx512dq 2645 2646.. option:: -mavx512er, -mno-avx512er 2647 2648.. option:: -mavx512f, -mno-avx512f 2649 2650.. option:: -mavx512ifma, -mno-avx512ifma 2651 2652.. option:: -mavx512pf, -mno-avx512pf 2653 2654.. option:: -mavx512vbmi, -mno-avx512vbmi 2655 2656.. option:: -mavx512vbmi2, -mno-avx512vbmi2 2657 2658.. option:: -mavx512vl, -mno-avx512vl 2659 2660.. option:: -mavx512vnni, -mno-avx512vnni 2661 2662.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 2663 2664.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 2665 2666.. option:: -mbmi, -mno-bmi 2667 2668.. option:: -mbmi2, -mno-bmi2 2669 2670.. option:: -mcldemote, -mno-cldemote 2671 2672.. option:: -mclflushopt, -mno-clflushopt 2673 2674.. option:: -mclwb, -mno-clwb 2675 2676.. option:: -mclzero, -mno-clzero 2677 2678.. option:: -mcx16, -mno-cx16 2679 2680.. option:: -menqcmd, -mno-enqcmd 2681 2682.. option:: -mf16c, -mno-f16c 2683 2684.. option:: -mfma, -mno-fma 2685 2686.. option:: -mfma4, -mno-fma4 2687 2688.. option:: -mfsgsbase, -mno-fsgsbase 2689 2690.. option:: -mfxsr, -mno-fxsr 2691 2692.. option:: -mgfni, -mno-gfni 2693 2694.. option:: -minvpcid, -mno-invpcid 2695 2696.. option:: -mlwp, -mno-lwp 2697 2698.. option:: -mlzcnt, -mno-lzcnt 2699 2700.. option:: -mmmx, -mno-mmx 2701 2702.. option:: -mmovbe, -mno-movbe 2703 2704.. option:: -mmovdir64b, -mno-movdir64b 2705 2706.. option:: -mmovdiri, -mno-movdiri 2707 2708.. option:: -mmpx, -mno-mpx 2709 2710.. option:: -mmwaitx, -mno-mwaitx 2711 2712.. option:: -mpclmul, -mno-pclmul 2713 2714.. option:: -mpconfig, -mno-pconfig 2715 2716.. option:: -mpku, -mno-pku 2717 2718.. option:: -mpopcnt, -mno-popcnt 2719 2720.. option:: -mprefetchwt1, -mno-prefetchwt1 2721 2722.. option:: -mprfchw, -mno-prfchw 2723 2724.. option:: -mptwrite, -mno-ptwrite 2725 2726.. option:: -mrdpid, -mno-rdpid 2727 2728.. option:: -mrdrnd, -mno-rdrnd 2729 2730.. option:: -mrdseed, -mno-rdseed 2731 2732.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 2733 2734.. option:: -mrtm, -mno-rtm 2735 2736.. option:: -msahf, -mno-sahf 2737 2738.. option:: -msgx, -mno-sgx 2739 2740.. option:: -msha, -mno-sha 2741 2742.. option:: -mshstk, -mno-shstk 2743 2744.. option:: -msse, -mno-sse 2745 2746.. option:: -msse2, -mno-sse2 2747 2748.. option:: -msse3, -mno-sse3 2749 2750.. option:: -msse4.1, -mno-sse4.1 2751 2752.. program:: clang1 2753.. option:: -msse4.2, -mno-sse4.2, -msse4 2754.. program:: clang 2755 2756.. option:: -msse4a, -mno-sse4a 2757 2758.. option:: -mssse3, -mno-ssse3 2759 2760.. option:: -mtbm, -mno-tbm 2761 2762.. option:: -mvaes, -mno-vaes 2763 2764.. option:: -mvpclmulqdq, -mno-vpclmulqdq 2765 2766.. option:: -mwaitpkg, -mno-waitpkg 2767 2768.. option:: -mwbnoinvd, -mno-wbnoinvd 2769 2770.. option:: -mx87, -m80387, -mno-x87 2771 2772.. option:: -mxop, -mno-xop 2773 2774.. option:: -mxsave, -mno-xsave 2775 2776.. option:: -mxsavec, -mno-xsavec 2777 2778.. option:: -mxsaveopt, -mno-xsaveopt 2779 2780.. option:: -mxsaves, -mno-xsaves 2781 2782RISCV 2783----- 2784.. option:: -mrelax, -mno-relax 2785 2786Enable linker relaxation 2787 2788Optimization level 2789~~~~~~~~~~~~~~~~~~ 2790 2791Flags controlling how much optimization should be performed. 2792 2793.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg> 2794 2795.. option:: -Ofast<arg> 2796 2797Debug information generation 2798~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2799 2800Flags controlling how much and what kind of debug information should be 2801generated. 2802 2803Kind and level of debug information 2804----------------------------------- 2805.. option:: -g, --debug, --debug=<arg> 2806 2807Generate source-level debug information 2808 2809.. option:: -gdwarf-2 2810 2811Generate source-level debug information with dwarf version 2 2812 2813.. option:: -gdwarf-3 2814 2815Generate source-level debug information with dwarf version 3 2816 2817.. option:: -gdwarf-4, -gdwarf 2818 2819Generate source-level debug information with dwarf version 4 2820 2821.. option:: -gdwarf-5 2822 2823Generate source-level debug information with dwarf version 5 2824 2825.. option:: -gfull 2826 2827.. option:: -gused 2828 2829Debug level 2830___________ 2831.. option:: -g0 2832 2833.. option:: -g2 2834 2835.. option:: -g3 2836 2837.. option:: -ggdb0 2838 2839.. option:: -ggdb1 2840 2841.. option:: -ggdb2 2842 2843.. option:: -ggdb3 2844 2845.. option:: -gline-tables-only, -g1, -gmlt 2846 2847Emit debug line number tables only 2848 2849.. option:: -gmodules 2850 2851Generate debug info with external references to clang modules or precompiled headers 2852 2853Debugger to tune debug information for 2854______________________________________ 2855.. option:: -ggdb 2856 2857.. option:: -glldb 2858 2859.. option:: -gsce 2860 2861Debug information flags 2862----------------------- 2863.. option:: -gcolumn-info, -gno-column-info 2864 2865.. option:: -gdwarf-aranges 2866 2867.. option:: -gembed-source, -gno-embed-source 2868 2869Embed source text in DWARF debug sections 2870 2871.. option:: -ggnu-pubnames, -gno-gnu-pubnames 2872 2873.. option:: -gpubnames, -gno-pubnames 2874 2875.. option:: -grecord-command-line, -grecord-gcc-switches, -gno-record-command-line, -gno-record-gcc-switches 2876 2877.. option:: -gsplit-dwarf 2878 2879.. option:: -gstrict-dwarf, -gno-strict-dwarf 2880 2881.. option:: -gz 2882 2883DWARF debug sections compression type 2884 2885.. program:: clang1 2886.. option:: -gz=<arg> 2887.. program:: clang 2888 2889DWARF debug sections compression type 2890 2891Static analyzer flags 2892===================== 2893 2894Flags controlling the behavior of the Clang Static Analyzer. 2895 2896.. option:: -Xanalyzer <arg> 2897 2898Pass <arg> to the static analyzer 2899 2900Fortran compilation flags 2901========================= 2902 2903Flags that will be passed onto the ``gfortran`` compiler when Clang is given 2904a Fortran input. 2905 2906.. option:: -A<arg>, --assert <arg>, --assert=<arg> 2907 2908.. option:: -A-<arg> 2909 2910.. option:: -J<arg> 2911 2912.. option:: -cpp 2913 2914.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 2915 2916.. option:: -falign-commons, -fno-align-commons 2917 2918.. option:: -fall-intrinsics, -fno-all-intrinsics 2919 2920.. option:: -fautomatic, -fno-automatic 2921 2922.. option:: -fbackslash, -fno-backslash 2923 2924.. option:: -fbacktrace, -fno-backtrace 2925 2926.. option:: -fblas-matmul-limit=<arg> 2927 2928.. option:: -fbounds-check, -fno-bounds-check 2929 2930.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 2931 2932.. option:: -fcheck=<arg> 2933 2934.. option:: -fcoarray=<arg> 2935 2936.. option:: -fconvert=<arg> 2937 2938.. option:: -fcray-pointer, -fno-cray-pointer 2939 2940.. option:: -fd-lines-as-code, -fno-d-lines-as-code 2941 2942.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 2943 2944.. option:: -fdefault-double-8, -fno-default-double-8 2945 2946.. option:: -fdefault-integer-8, -fno-default-integer-8 2947 2948.. option:: -fdefault-real-8, -fno-default-real-8 2949 2950.. option:: -fdollar-ok, -fno-dollar-ok 2951 2952.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 2953 2954.. option:: -fdump-fortran-original, -fno-dump-fortran-original 2955 2956.. option:: -fdump-parse-tree, -fno-dump-parse-tree 2957 2958.. option:: -fexternal-blas, -fno-external-blas 2959 2960.. option:: -ff2c, -fno-f2c 2961 2962.. option:: -ffixed-form, -fno-fixed-form 2963 2964.. option:: -ffixed-line-length-<arg> 2965 2966.. option:: -ffpe-trap=<arg> 2967 2968.. option:: -ffree-form, -fno-free-form 2969 2970.. option:: -ffree-line-length-<arg> 2971 2972.. option:: -ffrontend-optimize, -fno-frontend-optimize 2973 2974.. option:: -fimplicit-none, -fno-implicit-none 2975 2976.. option:: -finit-character=<arg> 2977 2978.. option:: -finit-integer=<arg> 2979 2980.. option:: -finit-local-zero, -fno-init-local-zero 2981 2982.. option:: -finit-logical=<arg> 2983 2984.. option:: -finit-real=<arg> 2985 2986.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 2987 2988.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 2989 2990.. option:: -fmax-array-constructor=<arg> 2991 2992.. option:: -fmax-errors=<arg> 2993 2994.. option:: -fmax-identifier-length, -fno-max-identifier-length 2995 2996.. option:: -fmax-stack-var-size=<arg> 2997 2998.. option:: -fmax-subrecord-length=<arg> 2999 3000.. option:: -fmodule-private, -fno-module-private 3001 3002.. option:: -fpack-derived, -fno-pack-derived 3003 3004.. option:: -fprotect-parens, -fno-protect-parens 3005 3006.. option:: -frange-check, -fno-range-check 3007 3008.. option:: -freal-4-real-10, -fno-real-4-real-10 3009 3010.. option:: -freal-4-real-16, -fno-real-4-real-16 3011 3012.. option:: -freal-4-real-8, -fno-real-4-real-8 3013 3014.. option:: -freal-8-real-10, -fno-real-8-real-10 3015 3016.. option:: -freal-8-real-16, -fno-real-8-real-16 3017 3018.. option:: -freal-8-real-4, -fno-real-8-real-4 3019 3020.. option:: -frealloc-lhs, -fno-realloc-lhs 3021 3022.. option:: -frecord-marker=<arg> 3023 3024.. option:: -frecursive, -fno-recursive 3025 3026.. option:: -frepack-arrays, -fno-repack-arrays 3027 3028.. option:: -fsecond-underscore, -fno-second-underscore 3029 3030.. option:: -fsign-zero, -fno-sign-zero 3031 3032.. option:: -fstack-arrays, -fno-stack-arrays 3033 3034.. option:: -funderscoring, -fno-underscoring 3035 3036.. option:: -fwhole-file, -fno-whole-file 3037 3038.. option:: -imultilib <arg> 3039 3040.. option:: -nocpp 3041 3042.. option:: -static-libgfortran 3043 3044Linker flags 3045============ 3046Flags that are passed on to the linker 3047 3048.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3049 3050Add directory to library search path 3051 3052.. option:: -Mach 3053 3054.. option:: -T<script> 3055 3056Specify <script> as linker script 3057 3058.. option:: -Tbss<addr> 3059 3060Set starting address of BSS to <addr> 3061 3062.. option:: -Tdata<addr> 3063 3064Set starting address of DATA to <addr> 3065 3066.. option:: -Ttext<addr> 3067 3068Set starting address of TEXT to <addr> 3069 3070.. option:: -Wl,<arg>,<arg2>... 3071 3072Pass the comma separated arguments in <arg> to the linker 3073 3074.. option:: -X 3075 3076.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3077 3078Pass <arg> to the linker 3079 3080.. program:: clang1 3081.. option:: -Z 3082.. program:: clang 3083 3084.. option:: -e<arg>, --entry 3085 3086.. option:: -filelist <arg> 3087 3088.. option:: --hip-device-lib-path=<arg> 3089 3090HIP device library path 3091 3092.. option:: --hip-device-lib=<arg> 3093 3094HIP device library 3095 3096.. option:: -l<arg> 3097 3098.. option:: -r 3099 3100.. option:: -rpath <arg> 3101 3102.. option:: -s 3103 3104.. option:: -t 3105 3106.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3107 3108.. option:: -undef 3109 3110undef all system defines 3111 3112.. option:: -undefined<arg>, --no-undefined 3113 3114.. option:: -z <arg> 3115 3116Pass -z <arg> to the linker 3117 3118