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:: --analyzer-no-default-checks 90 91.. option:: --analyzer-output<arg> 92 93Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|text). 94 95.. option:: -ansi, --ansi 96 97.. option:: -arch <arg> 98 99.. program:: clang1 100.. option:: -arch\_errors\_fatal 101.. program:: clang 102 103.. program:: clang2 104.. option:: -arch\_only <arg> 105.. program:: clang 106 107.. option:: -arcmt-migrate-emit-errors 108 109Emit ARC errors even if the migrator can fix them 110 111.. option:: -arcmt-migrate-report-output <arg> 112 113Output path for the plist report 114 115.. option:: --autocomplete=<arg> 116 117.. option:: -bind\_at\_load 118 119.. option:: -bundle 120 121.. program:: clang1 122.. option:: -bundle\_loader <arg> 123.. program:: clang 124 125.. option:: -cfguard 126 127Emit tables required for Windows Control Flow Guard. 128 129.. option:: -client\_name<arg> 130 131.. option:: -compatibility\_version<arg> 132 133.. option:: --config <arg> 134 135Specifies configuration file 136 137.. option:: --constant-cfstrings 138 139.. option:: -coverage, --coverage 140 141.. option:: --cuda-compile-host-device 142 143Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 144 145.. option:: --cuda-device-only 146 147Compile CUDA code for device only 148 149.. option:: --cuda-gpu-arch=<arg>, --no-cuda-gpu-arch=<arg> 150 151CUDA GPU architecture (e.g. sm\_35). May be specified more than once. 152 153.. option:: --cuda-host-only 154 155Compile CUDA code for host only. Has no effect on non-CUDA compilations. 156 157.. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> 158 159Include PTX for the following GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. 160 161.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 162 163Enable device-side debug info generation. Disables ptxas optimizations. 164 165.. option:: -current\_version<arg> 166 167.. option:: -dead\_strip 168 169.. option:: -dependency-dot <arg> 170 171Filename to write DOT-formatted header dependencies to 172 173.. option:: -dependency-file <arg> 174 175Filename (or -) to write dependency output to 176 177.. option:: -dumpmachine 178 179.. option:: -dumpversion 180 181.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 182 183.. option:: -dylib\_file <arg> 184 185.. option:: -dylinker 186 187.. program:: clang1 188.. option:: -dylinker\_install\_name<arg> 189.. program:: clang 190 191.. option:: -dynamic 192 193.. option:: -dynamiclib 194 195.. option:: -emit-ast 196 197Emit Clang AST files for source inputs 198 199.. option:: -exported\_symbols\_list <arg> 200 201.. option:: -faligned-new=<arg> 202 203.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 204 205Use approximate transcendental functions 206 207.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero 208 209Flush denormal floating point values to zero in CUDA device mode. 210 211.. option:: -fcuda-rdc, -fno-cuda-rdc 212 213Generate relocatable device code, also known as separate compilation mode. 214 215.. option:: -fcuda-short-ptr, -fno-cuda-short-ptr 216 217Use 32-bit pointers for accessing const/local/shared address spaces. 218 219.. option:: -ffixed-r19 220 221Reserve register r19 (Hexagon only) 222 223.. option:: -fheinous-gnu-extensions 224 225.. option:: -flat\_namespace 226 227.. option:: -fopenmp-targets=<arg1>,<arg2>... 228 229Specify comma-separated list of triples OpenMP offloading targets to be supported 230 231.. option:: -force\_cpusubtype\_ALL 232 233.. program:: clang1 234.. option:: -force\_flat\_namespace 235.. program:: clang 236 237.. program:: clang2 238.. option:: -force\_load <arg> 239.. program:: clang 240 241.. option:: -framework <arg> 242 243.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 244 245Add -rpath with architecture-specific resource directory to the linker flags 246 247.. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> 248 249Use the gcc toolchain at the given directory 250 251.. option:: -gcodeview 252 253Generate CodeView debug information 254 255.. option:: -headerpad\_max\_install\_names<arg> 256 257.. option:: -help, --help 258 259Display available options 260 261.. option:: --help-hidden 262 263Display help for hidden options 264 265.. option:: --hip-link 266 267Link clang-offload-bundler bundles for HIP 268 269.. option:: -image\_base <arg> 270 271.. option:: -index-header-map 272 273Make the next included directory (-I or -F) an indexer header map 274 275.. option:: -init <arg> 276 277.. option:: -install\_name <arg> 278 279.. option:: -keep\_private\_externs 280 281.. option:: -lazy\_framework <arg> 282 283.. program:: clang1 284.. option:: -lazy\_library <arg> 285.. program:: clang 286 287.. option:: -mbig-endian, -EB 288 289.. option:: --migrate 290 291Run the migrator 292 293.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 294 295.. option:: -mlinker-version=<arg> 296 297.. option:: -mlittle-endian, -EL 298 299.. option:: -mllvm <arg> 300 301Additional arguments to forward to LLVM's option processing 302 303.. option:: -module-dependency-dir <arg> 304 305Directory to dump module dependencies to 306 307.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 308 309.. option:: -multi\_module 310 311.. option:: -multiply\_defined <arg> 312 313.. program:: clang1 314.. option:: -multiply\_defined\_unused <arg> 315.. program:: clang 316 317.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 318 319.. option:: --no-cuda-version-check 320 321Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 322 323.. option:: -no-integrated-cpp, --no-integrated-cpp 324 325.. option:: -no\_dead\_strip\_inits\_and\_terms 326 327.. option:: -nobuiltininc 328 329Disable builtin #include directories 330 331.. option:: -nocudainc 332 333.. option:: -nocudalib 334 335.. option:: -nodefaultlibs 336 337.. option:: -nofixprebinding 338 339.. option:: -nolibc 340 341.. option:: -nomultidefs 342 343.. option:: -nopie, -no-pie 344 345.. option:: -noprebind 346 347.. option:: -noprofilelib 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:: --print-supported-cpus 614 615Print supported cpu models for the given target 616 617.. option:: -time 618 619Time individual commands 620 621.. option:: -traditional, --traditional 622 623.. option:: -traditional-cpp, --traditional-cpp 624 625Enable some traditional CPP emulation 626 627.. option:: -twolevel\_namespace 628 629.. program:: clang1 630.. option:: -twolevel\_namespace\_hints 631.. program:: clang 632 633.. option:: -umbrella <arg> 634 635.. option:: -unexported\_symbols\_list <arg> 636 637.. option:: -v, --verbose 638 639Show commands to run and use verbose output 640 641.. option:: --verify-debug-info 642 643Verify the binary representation of debug output 644 645.. option:: --version 646 647Print version information 648 649.. option:: -w, --no-warnings 650 651Suppress all warnings 652 653.. option:: -weak-l<arg> 654 655.. option:: -weak\_framework <arg> 656 657.. program:: clang1 658.. option:: -weak\_library <arg> 659.. program:: clang 660 661.. program:: clang2 662.. option:: -weak\_reference\_mismatches <arg> 663.. program:: clang 664 665.. option:: -whatsloaded 666 667.. option:: -whyload 668 669.. option:: -working-directory<arg>, -working-directory=<arg> 670 671Resolve file paths relative to the specified directory 672 673.. option:: -x<language>, --language <arg>, --language=<arg> 674 675Treat subsequent input files as having type <language> 676 677.. option:: -y<arg> 678 679Actions 680======= 681The action to perform on the input. 682 683.. option:: -E, --preprocess 684 685Only run the preprocessor 686 687.. option:: -S, --assemble 688 689Only run preprocess and compilation steps 690 691.. option:: -c, --compile 692 693Only run preprocess, compile, and assemble steps 694 695.. option:: -emit-llvm 696 697Use the LLVM representation for assembler and object files 698 699.. option:: -fsyntax-only 700 701.. option:: -module-file-info 702 703Provide information about a particular module file 704 705.. option:: --precompile 706 707Only precompile the input 708 709.. option:: -rewrite-objc 710 711Rewrite Objective-C source to C++ 712 713.. option:: -verify-pch 714 715Load and verify that a pre-compiled header file is not stale 716 717Compilation flags 718================= 719 720Flags controlling the behavior of Clang during compilation. These flags have 721no effect during actions that do not perform compilation. 722 723.. option:: -Xassembler <arg> 724 725Pass <arg> to the assembler 726 727.. option:: -Xclang <arg> 728 729Pass <arg> to the clang compiler 730 731.. option:: -fclang-abi-compat=<version> 732 733Attempt to match the ABI of Clang <version> 734 735.. option:: -fcomment-block-commands=<arg>,<arg2>... 736 737Treat each comma separated argument in <arg> as a documentation comment block command 738 739.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 740 741Require member pointer base types to be complete if they would be significant under the Microsoft ABI 742 743.. option:: -fcrash-diagnostics-dir=<arg> 744 745.. option:: -fdeclspec, -fno-declspec 746 747Allow \_\_declspec as a keyword 748 749.. option:: -fdepfile-entry=<arg> 750 751.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 752 753.. option:: -fdiagnostics-format=<arg> 754 755.. option:: -fdiagnostics-parseable-fixits 756 757Print fix-its in machine parseable form 758 759.. option:: -fdiagnostics-print-source-range-info 760 761Print source range spans in numeric form 762 763.. option:: -fdiagnostics-show-category=<arg> 764 765.. option:: -fdiscard-value-names, -fno-discard-value-names 766 767Discard value names in LLVM IR 768 769.. option:: -fexperimental-isel, -fno-experimental-isel 770 771Enables the experimental global instruction selector 772 773.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 774 775Enables an experimental new pass manager in LLVM. 776 777.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 778 779Use separate accesses for consecutive bitfield runs with legal widths and alignments. 780 781.. option:: -finline-functions, -fno-inline-functions 782 783Inline suitable functions 784 785.. option:: -finline-hint-functions 786 787Inline functions which are (explicitly or implicitly) marked inline 788 789.. option:: -fno-crash-diagnostics 790 791Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 792 793.. option:: -fno-sanitize-blacklist 794 795Don't use blacklist file for sanitizers 796 797.. option:: -fparse-all-comments 798 799.. option:: -frecord-command-line, -frecord-gcc-switches, -fno-record-command-line, -fno-record-gcc-switches 800 801Generate a section named ".GCC.command.line" containing the clang driver 802command-line. After linking, the section may contain multiple command lines, 803which will be individually terminated by null bytes. Separate arguments within 804a command line are combined with spaces; spaces and backslashes within an 805argument are escaped with backslashes. This format differs from the format of 806the equivalent section produced by GCC with the -frecord-gcc-switches flag. 807This option is currently only supported on ELF targets. 808 809.. option:: -fsanitize-address-field-padding=<arg> 810 811Level of field padding for AddressSanitizer 812 813.. option:: -fsanitize-address-globals-dead-stripping 814 815Enable linker dead stripping of globals in AddressSanitizer 816 817.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 818 819Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 820 821.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 822 823Enable "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. 824 825An 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. 826 827.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 828 829Enable use-after-scope detection in AddressSanitizer 830 831.. option:: -fsanitize-blacklist=<arg> 832 833Path to blacklist file for sanitizers 834 835.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 836 837Enable control flow integrity (CFI) checks for cross-DSO calls. 838 839.. option:: -fsanitize-cfi-icall-generalize-pointers 840 841Generalize pointers in CFI indirect call type signature checks 842 843.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 844 845Specify the type of coverage instrumentation for Sanitizers 846 847.. option:: -fsanitize-link-c++-runtime 848 849.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 850 851Enable origins tracking in MemorySanitizer 852 853.. program:: clang1 854.. option:: -fsanitize-memory-track-origins=<arg> 855.. program:: clang 856 857Enable origins tracking in MemorySanitizer 858 859.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 860 861Enable use-after-destroy detection in MemorySanitizer 862 863.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 864 865.. option:: -fsanitize-recover, -fno-sanitize-recover 866 867.. program:: clang1 868.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>... 869.. program:: clang 870 871Enable recovery for specified sanitizers 872 873.. option:: -fsanitize-stats, -fno-sanitize-stats 874 875Enable sanitizer statistics gathering. 876 877.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 878 879Enable atomic operations instrumentation in ThreadSanitizer (default) 880 881.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 882 883Enable function entry/exit instrumentation in ThreadSanitizer (default) 884 885.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 886 887Enable memory access instrumentation in ThreadSanitizer (default) 888 889.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>... 890 891Enable trapping for specified sanitizers 892 893.. option:: -fsanitize-undefined-strip-path-components=<number> 894 895Strip (or keep only, if negative) a given number of path components when emitting check metadata. 896 897.. option:: -fsanitize-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error 898 899.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 900 901Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 902 903.. option:: -moutline, -mno-outline 904 905Enable function outlining (AArch64 only) 906 907.. option:: --param <arg>, --param=<arg> 908 909.. option:: -std=<arg>, --std=<arg>, --std <arg> 910 911Language standard to compile for 912 913Preprocessor flags 914~~~~~~~~~~~~~~~~~~ 915 916Flags controlling the behavior of the Clang preprocessor. 917 918.. option:: -C, --comments 919 920Include comments in preprocessed output 921 922.. option:: -CC, --comments-in-macros 923 924Include comments from within macros in preprocessed output 925 926.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 927 928Define <macro> to <value> (or 1 if <value> omitted) 929 930.. option:: -H, --trace-includes 931 932Show header includes and nesting depth 933 934.. option:: -P, --no-line-commands 935 936Disable linemarker output in -E mode 937 938.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 939 940Undefine macro <macro> 941 942.. option:: -Wp,<arg>,<arg2>... 943 944Pass the comma separated arguments in <arg> to the preprocessor 945 946.. option:: -Xpreprocessor <arg> 947 948Pass <arg> to the preprocessor 949 950Include path management 951----------------------- 952 953Flags controlling how ``#include``\s are resolved to files. 954 955.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 956 957Add directory to include search path 958 959.. option:: -I-, --include-barrier 960 961Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 962 963.. option:: --cuda-path-ignore-env 964 965Ignore environment variables to detect CUDA installation 966 967.. option:: --cuda-path=<arg> 968 969CUDA installation path 970 971.. option:: -cxx-isystem<directory> 972 973Add directory to the C++ SYSTEM include search path 974 975.. option:: -fbuild-session-file=<file> 976 977Use the last modification time of <file> as the build session timestamp 978 979.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 980 981Time when the current build session started 982 983.. option:: -fmodule-file=\[<name>=\]<file> 984 985Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 986 987.. option:: -fmodules-cache-path=<directory> 988 989Specify the module cache path 990 991.. option:: -fmodules-disable-diagnostic-validation 992 993Disable validation of the diagnostic options when loading the module 994 995.. option:: -fmodules-prune-after=<seconds> 996 997Specify the interval (in seconds) after which a module file will be considered unused 998 999.. option:: -fmodules-prune-interval=<seconds> 1000 1001Specify the interval (in seconds) between attempts to prune the module cache 1002 1003.. option:: -fmodules-user-build-path <directory> 1004 1005Specify the module user build path 1006 1007.. option:: -fmodules-validate-once-per-build-session 1008 1009Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 1010 1011.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 1012 1013Validate the system headers that a module depends on when loading the module 1014 1015.. option:: -fprebuilt-module-path=<directory> 1016 1017Specify the prebuilt module path 1018 1019.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1020 1021Add directory to AFTER include search path 1022 1023.. option:: -iframework<arg> 1024 1025Add directory to SYSTEM framework search path 1026 1027.. option:: -iframeworkwithsysroot<directory> 1028 1029Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1030 1031.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1032 1033Include macros from file before parsing 1034 1035.. option:: -include<file>, --include<file>, --include=<arg> 1036 1037Include file before parsing 1038 1039.. option:: -include-pch <file> 1040 1041Include precompiled header file 1042 1043.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1044 1045Set the -iwithprefix/-iwithprefixbefore prefix 1046 1047.. option:: -iquote<directory> 1048 1049Add directory to QUOTE include search path 1050 1051.. option:: -isysroot<dir> 1052 1053Set the system root directory (usually /) 1054 1055.. option:: -isystem<directory> 1056 1057Add directory to SYSTEM include search path 1058 1059.. option:: -isystem-after<directory> 1060 1061Add directory to end of the SYSTEM include search path 1062 1063.. option:: -ivfsoverlay<arg> 1064 1065Overlay the virtual filesystem described by file over the real file system 1066 1067.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1068 1069Set directory to SYSTEM include search path with prefix 1070 1071.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1072 1073Set directory to include search path with prefix 1074 1075.. option:: -iwithsysroot<directory> 1076 1077Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1078 1079.. option:: --ptxas-path=<arg> 1080 1081Path to ptxas (used for compiling CUDA code) 1082 1083.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1084 1085Treat all #include paths starting with <prefix> as including a system header. 1086 1087Dependency file generation 1088-------------------------- 1089 1090Flags controlling generation of a dependency file for ``make``-like build 1091systems. 1092 1093.. option:: -M, --dependencies 1094 1095Like -MD, but also implies -E and writes to stdout by default 1096 1097.. option:: -MD, --write-dependencies 1098 1099Write a depfile containing user and system headers 1100 1101.. option:: -MF<file> 1102 1103Write depfile output from -MMD, -MD, -MM, or -M to <file> 1104 1105.. option:: -MG, --print-missing-file-dependencies 1106 1107Add missing headers to depfile 1108 1109.. option:: -MJ<arg> 1110 1111Write a compilation database entry per input 1112 1113.. option:: -MM, --user-dependencies 1114 1115Like -MMD, but also implies -E and writes to stdout by default 1116 1117.. option:: -MMD, --write-user-dependencies 1118 1119Write a depfile containing user headers 1120 1121.. option:: -MP 1122 1123Create phony target for each dependency (other than main file) 1124 1125.. option:: -MQ<arg> 1126 1127Specify name of main file output to quote in depfile 1128 1129.. option:: -MT<arg> 1130 1131Specify name of main file output in depfile 1132 1133.. option:: -MV 1134 1135Use NMake/Jom format for the depfile 1136 1137Dumping preprocessor state 1138-------------------------- 1139 1140Flags allowing the state of the preprocessor to be dumped in various ways. 1141 1142.. option:: -d 1143 1144.. program:: clang1 1145.. option:: -d<arg> 1146.. program:: clang 1147 1148.. option:: -dD 1149 1150Print macro definitions in -E mode in addition to normal output 1151 1152.. option:: -dI 1153 1154Print include directives in -E mode in addition to normal output 1155 1156.. option:: -dM 1157 1158Print macro definitions in -E mode instead of normal output 1159 1160Diagnostic flags 1161~~~~~~~~~~~~~~~~ 1162 1163Flags controlling which warnings, errors, and remarks Clang will generate. 1164See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1165 1166.. option:: -R<remark> 1167 1168Enable the specified remark 1169 1170.. option:: -Rpass-analysis=<arg> 1171 1172Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1173 1174.. option:: -Rpass-missed=<arg> 1175 1176Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1177 1178.. option:: -Rpass=<arg> 1179 1180Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1181 1182.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1183 1184Enable the specified warning 1185 1186.. option:: -Wdeprecated, -Wno-deprecated 1187 1188Enable warnings for deprecated constructs and define \_\_DEPRECATED 1189 1190.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1191 1192Target-independent compilation options 1193~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1194.. option:: -Wframe-larger-than=<arg> 1195 1196.. option:: -fPIC, -fno-PIC 1197 1198.. option:: -fPIE, -fno-PIE 1199 1200.. option:: -faccess-control, -fno-access-control 1201 1202.. option:: -faddrsig, -fno-addrsig 1203 1204Emit an address-significance table 1205 1206.. option:: -falign-functions, -fno-align-functions 1207 1208.. program:: clang1 1209.. option:: -falign-functions=<arg> 1210.. program:: clang 1211 1212.. program:: clang1 1213.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1214.. program:: clang 1215 1216Enable C++17 aligned allocation functions 1217 1218.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1219 1220Treat editor placeholders as valid source code 1221 1222.. option:: -fallow-unsupported 1223 1224.. option:: -faltivec, -fno-altivec 1225 1226.. option:: -fansi-escape-codes 1227 1228Use ANSI escape codes for diagnostics 1229 1230.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1231 1232Use Apple's kernel extensions ABI 1233 1234.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1235 1236Enable Apple gcc-compatible #pragma pack handling 1237 1238.. option:: -fapplication-extension, -fno-application-extension 1239 1240Restrict code to those available for App Extensions 1241 1242.. option:: -fasm, -fno-asm 1243 1244.. option:: -fasm-blocks, -fno-asm-blocks 1245 1246.. option:: -fassociative-math, -fno-associative-math 1247 1248.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1249 1250.. option:: -fast 1251 1252.. option:: -fastcp 1253 1254.. option:: -fastf 1255 1256.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1257 1258.. option:: -fautolink, -fno-autolink 1259 1260.. option:: -fblocks, -fno-blocks 1261 1262Enable the 'blocks' language feature 1263 1264.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1265 1266.. option:: -fborland-extensions, -fno-borland-extensions 1267 1268Accept non-standard constructs supported by the Borland compiler 1269 1270.. option:: -fbracket-depth=<arg> 1271 1272.. option:: -fbuiltin, -fno-builtin 1273 1274.. option:: -fbuiltin-module-map 1275 1276Load the clang builtins module map file. 1277 1278.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1279 1280Enable C++ static destructor registration (the default) 1281 1282.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1283 1284.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1285 1286Instrument control-flow architecture protection. Options: return, branch, full, none. 1287 1288.. option:: -fchar8\_t, -fno-char8\_t 1289 1290Enable C++ builtin type char8\_t 1291 1292.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1293 1294.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1295 1296Use colors in diagnostics 1297 1298.. option:: -fcommon, -fno-common 1299 1300.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1301 1302.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1303 1304.. option:: -fconstant-string-class=<arg> 1305 1306.. option:: -fconstexpr-backtrace-limit=<arg> 1307 1308.. option:: -fconstexpr-depth=<arg> 1309 1310.. option:: -fconstexpr-steps=<arg> 1311 1312.. option:: -fcoroutines-ts, -fno-coroutines-ts 1313 1314Enable support for the C++ Coroutines TS 1315 1316.. option:: -fcoverage-mapping, -fno-coverage-mapping 1317 1318Generate coverage mapping to enable code coverage analysis 1319 1320.. option:: -fcreate-profile 1321 1322.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1323 1324Enable C++ exceptions 1325 1326.. option:: -fcxx-modules, -fno-cxx-modules 1327 1328.. option:: -fdata-sections, -fno-data-sections 1329 1330Place each data in its own section (ELF Only) 1331 1332.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1333 1334Emit extra debug info to make sample profile more accurate. 1335 1336.. option:: -fdebug-macro, -fno-debug-macro 1337 1338Emit macro debug information 1339 1340.. option:: -fdebug-pass-arguments 1341 1342.. option:: -fdebug-pass-structure 1343 1344.. option:: -fdebug-prefix-map=<arg> 1345 1346remap file source paths in debug info 1347 1348.. option:: -fdebug-types-section, -fno-debug-types-section 1349 1350Place debug types in their own section (ELF Only) 1351 1352.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1353 1354Parse templated function definitions at the end of the translation unit 1355 1356.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1357 1358Treat usage of null pointers as undefined behavior. 1359 1360.. option:: -fdenormal-fp-math=<arg> 1361 1362.. option:: -fdiagnostics-absolute-paths 1363 1364Print absolute paths in diagnostics 1365 1366.. option:: -fdiagnostics-color, -fno-diagnostics-color 1367 1368.. program:: clang1 1369.. option:: -fdiagnostics-color=<arg> 1370.. program:: clang 1371 1372.. option:: -fdiagnostics-hotness-threshold=<number> 1373 1374Prevent optimization remarks from being output if they do not have at least this profile count 1375 1376.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1377 1378Enable profile hotness information in diagnostic line 1379 1380.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1381 1382Display include stacks for diagnostic notes 1383 1384.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1385 1386Print option name with mappable diagnostics 1387 1388.. option:: -fdiagnostics-show-template-tree 1389 1390Print a template comparison tree for differing templates 1391 1392.. option:: -fdigraphs, -fno-digraphs 1393 1394Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1395 1396.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1397 1398Allow '$' in identifiers 1399 1400.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1401 1402Enable '\[\[\]\]' attributes in all C and C++ language modes 1403 1404.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1405 1406.. option:: -fdwarf-exceptions 1407 1408Use DWARF style exceptions 1409 1410.. option:: -felide-constructors, -fno-elide-constructors 1411 1412.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1413 1414.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1415 1416Embed LLVM bitcode (option: off, all, bitcode, marker) 1417 1418.. option:: -femit-all-decls 1419 1420Emit all declarations, even if unused 1421 1422.. option:: -femulated-tls, -fno-emulated-tls 1423 1424Use emutls functions to access thread\_local variables 1425 1426.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1427 1428.. option:: -ferror-limit=<arg> 1429 1430.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1431 1432.. option:: -fexceptions, -fno-exceptions 1433 1434Enable support for exception handling 1435 1436.. option:: -fexec-charset=<arg> 1437 1438.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1439 1440.. option:: -ffast-math, -fno-fast-math 1441 1442Allow aggressive, lossy floating-point optimizations 1443 1444.. option:: -ffinite-math-only, -fno-finite-math-only 1445 1446.. option:: -ffixed-point, -fno-fixed-point 1447 1448Enable fixed point types 1449 1450.. option:: -ffor-scope, -fno-for-scope 1451 1452.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1453 1454Emits more virtual tables to improve devirtualization 1455 1456.. option:: -fforce-enable-int128, -fno-force-enable-int128 1457 1458Enable support for int128\_t type 1459 1460.. option:: -ffp-contract=<arg> 1461 1462Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma, default) \| off (never fuse) 1463 1464.. option:: -ffreestanding 1465 1466Assert that the compilation takes place in a freestanding environment 1467 1468.. option:: -ffunction-sections, -fno-function-sections 1469 1470Place each function in its own section (ELF Only) 1471 1472.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1473 1474.. option:: -fgnu-keywords, -fno-gnu-keywords 1475 1476Allow GNU-extension keywords regardless of language standard 1477 1478.. option:: -fgnu-runtime 1479 1480Generate output compatible with the standard GNU Objective-C runtime 1481 1482.. option:: -fgnu89-inline, -fno-gnu89-inline 1483 1484Use the gnu89 inline semantics 1485 1486.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1487 1488.. option:: -fhonor-nans, -fno-honor-nans 1489 1490.. option:: -fhosted 1491 1492.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1493 1494Implicitly search the file system for module map files. 1495 1496.. option:: -fimplicit-modules, -fno-implicit-modules 1497 1498.. option:: -finput-charset=<arg> 1499 1500.. option:: -finstrument-function-entry-bare 1501 1502Instrument function entry only, after inlining, without arguments to the instrumentation call 1503 1504.. option:: -finstrument-functions 1505 1506Generate calls to instrument function entry and exit 1507 1508.. option:: -finstrument-functions-after-inlining 1509 1510Like -finstrument-functions, but insert the calls after inlining 1511 1512.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1513 1514Enable the integrated assembler 1515 1516.. option:: -fjump-tables, -fno-jump-tables 1517 1518.. option:: -fkeep-static-consts 1519 1520Keep static const variables even if unused 1521 1522.. option:: -flax-vector-conversions, -fno-lax-vector-conversions 1523 1524.. option:: -flimited-precision=<arg> 1525 1526.. option:: -flto, -fno-lto 1527 1528Enable LTO in 'full' mode 1529 1530.. option:: -flto-jobs=<arg> 1531 1532Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1533 1534.. program:: clang1 1535.. option:: -flto=<arg> 1536.. program:: clang 1537 1538Set LTO mode to either 'full' or 'thin' 1539 1540.. option:: -fmacro-backtrace-limit=<arg> 1541 1542.. option:: -fmath-errno, -fno-math-errno 1543 1544Require math functions to indicate errors by setting errno 1545 1546.. option:: -fmax-type-align=<arg> 1547 1548Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1549 1550.. option:: -fmerge-all-constants, -fno-merge-all-constants 1551 1552Allow merging of constants 1553 1554.. option:: -fmessage-length=<arg> 1555 1556.. option:: -fmodule-file-deps, -fno-module-file-deps 1557 1558.. option:: -fmodule-map-file=<file> 1559 1560Load this module map file 1561 1562.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1563 1564Specify the name of the module to build 1565 1566.. option:: -fmodules, -fno-modules 1567 1568Enable the 'modules' language feature 1569 1570.. option:: -fmodules-decluse, -fno-modules-decluse 1571 1572Require declaration of modules used within a module 1573 1574.. option:: -fmodules-ignore-macro=<arg> 1575 1576Ignore the definition of the given macro when building and loading modules 1577 1578.. option:: -fmodules-search-all, -fno-modules-search-all 1579 1580Search even non-imported modules to resolve references 1581 1582.. option:: -fmodules-strict-decluse 1583 1584Like -fmodules-decluse but requires all headers to be in modules 1585 1586.. option:: -fmodules-ts 1587 1588Enable support for the C++ Modules TS 1589 1590.. option:: -fms-compatibility, -fno-ms-compatibility 1591 1592Enable full Microsoft Visual C++ compatibility 1593 1594.. option:: -fms-compatibility-version=<arg> 1595 1596Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1597 1598.. option:: -fms-extensions, -fno-ms-extensions 1599 1600Accept some non-standard constructs supported by the Microsoft compiler 1601 1602.. option:: -fms-memptr-rep=<arg> 1603 1604.. option:: -fms-volatile<arg> 1605 1606.. option:: -fmsc-version=<arg> 1607 1608Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1609 1610.. option:: -fmudflap 1611 1612.. option:: -fmudflapth 1613 1614.. option:: -fnested-functions 1615 1616.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1617 1618Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1619 1620.. option:: -fnext-runtime 1621 1622.. option:: -fno-builtin-<arg> 1623 1624Disable implicit builtin knowledge of a specific function 1625 1626.. option:: -fno-elide-type 1627 1628Do not elide types when printing diagnostics 1629 1630.. option:: -fno-max-type-align 1631 1632.. option:: -fno-operator-names 1633 1634Do not treat C++ operator name keywords as synonyms for operators 1635 1636.. option:: -fno-rtti-data 1637 1638Control emission of RTTI data 1639 1640.. option:: -fno-strict-modules-decluse 1641 1642.. option:: -fno-working-directory 1643 1644.. option:: -fnoxray-link-deps 1645 1646.. option:: -fobjc-abi-version=<arg> 1647 1648.. option:: -fobjc-arc, -fno-objc-arc 1649 1650Synthesize retain and release calls for Objective-C pointers 1651 1652.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1653 1654Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1655 1656.. option:: -fobjc-exceptions, -fno-objc-exceptions 1657 1658Enable Objective-C exceptions 1659 1660.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1661 1662.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1663 1664.. option:: -fobjc-link-runtime 1665 1666.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1667 1668.. option:: -fobjc-nonfragile-abi-version=<arg> 1669 1670.. option:: -fobjc-runtime=<arg> 1671 1672Specify the target Objective-C runtime kind and version 1673 1674.. option:: -fobjc-sender-dependent-dispatch 1675 1676.. option:: -fobjc-weak, -fno-objc-weak 1677 1678Enable ARC-style weak references in Objective-C 1679 1680.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1681 1682.. option:: -fopenmp, -fno-openmp 1683 1684Parse OpenMP pragmas and generate parallel code. 1685 1686.. option:: -fopenmp-simd, -fno-openmp-simd 1687 1688Emit OpenMP code only for SIMD-based constructs. 1689 1690.. option:: -fopenmp-version=<arg> 1691 1692.. program:: clang1 1693.. option:: -fopenmp=<arg> 1694.. program:: clang 1695 1696.. option:: -foperator-arrow-depth=<arg> 1697 1698.. option:: -foptimization-record-file=<arg> 1699 1700Specify the file name of any generated YAML optimization record 1701 1702.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1703 1704.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1705 1706.. option:: -fpack-struct, -fno-pack-struct 1707 1708.. program:: clang1 1709.. option:: -fpack-struct=<arg> 1710.. program:: clang 1711 1712Specify the default maximum struct packing alignment 1713 1714.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1715 1716Recognize and construct Pascal-style string literals 1717 1718.. option:: -fpcc-struct-return 1719 1720Override the default ABI to return all structs on the stack 1721 1722.. option:: -fpch-preprocess 1723 1724.. option:: -fpic, -fno-pic 1725 1726.. option:: -fpie, -fno-pie 1727 1728.. option:: -fplt, -fno-plt 1729 1730Use the PLT to make function calls 1731 1732.. option:: -fplugin=<dsopath> 1733 1734Load the named plugin (dynamic shared object) 1735 1736.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1737 1738.. option:: -fprofile-arcs, -fno-profile-arcs 1739 1740.. option:: -fprofile-dir=<arg> 1741 1742.. option:: -fprofile-generate, -fno-profile-generate 1743 1744Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1745 1746.. program:: clang1 1747.. option:: -fprofile-generate=<directory> 1748.. program:: clang 1749 1750Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1751 1752.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1753 1754Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1755 1756.. program:: clang1 1757.. option:: -fprofile-instr-generate=<file> 1758.. program:: clang 1759 1760Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1761 1762.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1763 1764.. program:: clang1 1765.. option:: -fprofile-instr-use=<arg> 1766.. program:: clang 1767 1768Use instrumentation data for profile-guided optimization 1769 1770.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1771 1772Specifies that the sample profile is accurate. If the sample 1773 profile is accurate, callsites without profile samples are marked 1774 as cold. Otherwise, treat callsites without profile samples as if 1775 we have no profile 1776 1777.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 1778 1779.. program:: clang1 1780.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 1781.. program:: clang 1782 1783Enable sample-based profile guided optimizations 1784 1785.. program:: clang1 1786.. option:: -fprofile-use=<pathname> 1787.. program:: clang 1788 1789Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 1790 1791.. option:: -freciprocal-math, -fno-reciprocal-math 1792 1793Allow division operations to be reassociated 1794 1795.. option:: -freg-struct-return 1796 1797Override the default ABI to return small structs in registers 1798 1799.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 1800 1801Use atexit or \_\_cxa\_atexit to register global destructors 1802 1803.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 1804 1805Enable C++17 relaxed template template argument matching 1806 1807.. option:: -freroll-loops, -fno-reroll-loops 1808 1809Turn on loop reroller 1810 1811.. option:: -fretain-comments-from-system-headers 1812 1813.. option:: -frewrite-imports, -fno-rewrite-imports 1814 1815.. option:: -frewrite-includes, -fno-rewrite-includes 1816 1817.. option:: -frewrite-map-file <arg> 1818 1819.. program:: clang1 1820.. option:: -frewrite-map-file=<arg> 1821.. program:: clang 1822 1823.. option:: -fropi, -fno-ropi 1824 1825.. option:: -frtti, -fno-rtti 1826 1827.. option:: -frwpi, -fno-rwpi 1828 1829.. option:: -fsave-optimization-record, -fno-save-optimization-record 1830 1831Generate a YAML optimization record file 1832 1833.. option:: -fseh-exceptions 1834 1835Use SEH style exceptions 1836 1837.. option:: -fshort-enums, -fno-short-enums 1838 1839Allocate to an enum type only as many bytes as it needs for the declared range of possible values 1840 1841.. option:: -fshort-wchar, -fno-short-wchar 1842 1843Force wchar\_t to be a short unsigned int 1844 1845.. option:: -fshow-column, -fno-show-column 1846 1847.. option:: -fshow-overloads=<arg> 1848 1849Which overload candidates to show when overload resolution fails: best\|all; defaults to all 1850 1851.. option:: -fshow-source-location, -fno-show-source-location 1852 1853.. option:: -fsignaling-math, -fno-signaling-math 1854 1855.. option:: -fsigned-bitfields 1856 1857.. option:: -fsigned-char, -fno-signed-char, --signed-char 1858 1859.. option:: -fsigned-zeros, -fno-signed-zeros 1860 1861.. option:: -fsized-deallocation, -fno-sized-deallocation 1862 1863Enable C++14 sized global deallocation functions 1864 1865.. option:: -fsjlj-exceptions 1866 1867Use SjLj style exceptions 1868 1869.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 1870 1871Enable the superword-level parallelism vectorization passes 1872 1873.. option:: -fspell-checking, -fno-spell-checking 1874 1875.. option:: -fspell-checking-limit=<arg> 1876 1877.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 1878 1879Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 1880 1881.. option:: -fsplit-stack 1882 1883.. option:: -fstack-protector, -fno-stack-protector 1884 1885Enable stack protectors for functions potentially vulnerable to stack smashing 1886 1887.. option:: -fstack-protector-all 1888 1889Force the usage of stack protectors for all functions 1890 1891.. option:: -fstack-protector-strong 1892 1893Use a strong heuristic to apply stack protectors to functions 1894 1895.. option:: -fstack-size-section, -fno-stack-size-section 1896 1897Emit section containing metadata on function stack sizes 1898 1899.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 1900 1901Emit full debug info for all types used by the program 1902 1903.. option:: -fstrict-aliasing, -fno-strict-aliasing 1904 1905.. option:: -fstrict-enums, -fno-strict-enums 1906 1907Enable optimizations based on the strict definition of an enum's value range 1908 1909.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 1910 1911Assume that overflowing float-to-int casts are undefined (default) 1912 1913.. option:: -fstrict-overflow, -fno-strict-overflow 1914 1915.. option:: -fstrict-return, -fno-strict-return 1916 1917Always treat control flow paths that fall off the end of a non-void function as unreachable 1918 1919.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 1920 1921Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 1922 1923.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 1924 1925.. option:: -ftabstop=<arg> 1926 1927.. option:: -ftemplate-backtrace-limit=<arg> 1928 1929.. option:: -ftemplate-depth-<arg> 1930 1931.. option:: -ftemplate-depth=<arg> 1932 1933.. option:: -ftest-coverage 1934 1935.. option:: -fthinlto-index=<arg> 1936 1937Perform ThinLTO importing using provided function summary index 1938 1939.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 1940 1941.. option:: -ftime-report 1942 1943.. option:: -ftime-trace 1944 1945Turn on time profiler. Results can be analyzed with chrome://tracing or 1946`Speedscope App <https://www.speedscope.app>`_ for flamegraph visualization 1947 1948.. option:: -ftime-trace-granularity=<arg> 1949 1950Minimum time granularity (in microseconds) traced by time profiler 1951 1952.. option:: -ftls-model=<arg> 1953 1954.. option:: -ftrap-function=<arg> 1955 1956Issue call to specified function rather than a trap instruction 1957 1958.. option:: -ftrapping-math, -fno-trapping-math 1959 1960.. option:: -ftrapv 1961 1962Trap on integer overflow 1963 1964.. option:: -ftrapv-handler <arg> 1965 1966.. program:: clang1 1967.. option:: -ftrapv-handler=<function name> 1968.. program:: clang 1969 1970Specify the function to be called on overflow 1971 1972.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 1973 1974Process trigraph sequences 1975 1976.. option:: -funique-section-names, -fno-unique-section-names 1977 1978Use unique names for text and data sections (ELF Only) 1979 1980.. option:: -funit-at-a-time, -fno-unit-at-a-time 1981 1982.. option:: -funroll-loops, -fno-unroll-loops 1983 1984Turn on loop unroller 1985 1986.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 1987 1988.. option:: -funsigned-bitfields 1989 1990.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 1991 1992.. option:: -funwind-tables, -fno-unwind-tables 1993 1994.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 1995 1996.. option:: -fuse-init-array, -fno-use-init-array 1997 1998Use .init\_array instead of .ctors 1999 2000.. option:: -fuse-ld=<arg> 2001 2002.. option:: -fuse-line-directives, -fno-use-line-directives 2003 2004.. option:: -fveclib=<arg> 2005 2006Use the given vector functions library 2007 2008.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2009 2010Enable the loop vectorization passes 2011 2012.. option:: -fverbose-asm, -fno-verbose-asm, -dA 2013 2014.. option:: -fvisibility-inlines-hidden 2015 2016Give inline C++ member functions hidden visibility by default 2017 2018.. option:: -fvisibility-ms-compat 2019 2020Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2021 2022.. option:: -fvisibility=<arg> 2023 2024Set the default symbol visibility for all global declarations 2025 2026.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2027 2028Enables whole-program vtable optimization. Requires -flto 2029 2030.. option:: -fwrapv, -fno-wrapv 2031 2032Treat signed integer overflow as two's complement 2033 2034.. option:: -fwritable-strings 2035 2036Store string literals as writable data 2037 2038.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2039 2040Determine whether to always emit \_\_xray\_customevent(...) calls even if the function it appears in is not always instrumented. 2041 2042.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2043 2044Determine whether to always emit \_\_xray\_typedevent(...) calls even if the function it appears in is not always instrumented. 2045 2046.. option:: -fxray-always-instrument=<arg> 2047 2048DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2049 2050.. option:: -fxray-attr-list=<arg> 2051 2052Filename defining the list of functions/types for imbuing XRay attributes. 2053 2054.. option:: -fxray-instruction-threshold<arg> 2055 2056.. program:: clang1 2057.. option:: -fxray-instruction-threshold=<arg> 2058.. program:: clang 2059 2060Sets the minimum function size to instrument with XRay 2061 2062.. option:: -fxray-instrument, -fno-xray-instrument 2063 2064Generate XRay instrumentation sleds on function entry and exit 2065 2066.. option:: -fxray-instrumentation-bundle=<arg> 2067 2068Select which XRay instrumentation points to emit. Options: all, none, function, custom. Default is 'all'. 2069 2070.. option:: -fxray-link-deps 2071 2072Tells clang to add the link dependencies for XRay. 2073 2074.. option:: -fxray-modes=<arg> 2075 2076List of modes to link in by default into XRay instrumented binaries. 2077 2078.. option:: -fxray-never-instrument=<arg> 2079 2080DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2081 2082.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2083 2084.. option:: -fzvector, -fno-zvector, -mzvector 2085 2086Enable System z vector language extension 2087 2088.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2089 2090.. option:: -pedantic-errors, --pedantic-errors 2091 2092OpenCL flags 2093------------ 2094.. option:: -cl-denorms-are-zero 2095 2096OpenCL only. Allow denormals to be flushed to zero. 2097 2098.. option:: -cl-fast-relaxed-math 2099 2100OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2101 2102.. option:: -cl-finite-math-only 2103 2104OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2105 2106.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2107 2108OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2109 2110.. option:: -cl-kernel-arg-info 2111 2112OpenCL only. Generate kernel argument metadata. 2113 2114.. option:: -cl-mad-enable 2115 2116OpenCL only. Allow use of less precise MAD computations in the generated binary. 2117 2118.. option:: -cl-no-signed-zeros 2119 2120OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2121 2122.. option:: -cl-opt-disable 2123 2124OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2125 2126.. option:: -cl-single-precision-constant 2127 2128OpenCL only. Treat double precision floating-point constant as single precision constant. 2129 2130.. option:: -cl-std=<arg> 2131 2132OpenCL language standard to compile for. 2133 2134.. option:: -cl-strict-aliasing 2135 2136OpenCL only. This option is added for compatibility with OpenCL 1.0. 2137 2138.. option:: -cl-uniform-work-group-size 2139 2140OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2141 2142.. option:: -cl-unsafe-math-optimizations 2143 2144OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2145 2146Target-dependent compilation options 2147~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2148.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg> 2149 2150Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2151 2152.. option:: -m16 2153 2154.. option:: -m32 2155 2156.. option:: -m64 2157 2158.. option:: -mabi=<arg> 2159 2160.. option:: -malign-double 2161 2162Align doubles to two words in structs (x86 only) 2163 2164.. option:: -march=<arg> 2165 2166.. option:: -masm=<arg> 2167 2168.. option:: -mbackchain, -mno-backchain 2169 2170Link stack frames through backchain on System Z 2171 2172.. option:: -mcmodel=<arg> 2173 2174.. option:: -mconsole<arg> 2175 2176.. 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) 2177 2178Use -mcpu=? to see a list of supported cpu models. 2179 2180.. option:: -mcrc, -mno-crc 2181 2182Allow use of CRC instructions (ARM/Mips only) 2183 2184.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2185 2186.. option:: -mdll<arg> 2187 2188.. option:: -mdynamic-no-pic<arg> 2189 2190.. option:: -meabi <arg> 2191 2192Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2193 2194.. option:: -mfentry 2195 2196Insert calls to fentry at function entry (x86/SystemZ only) 2197 2198.. option:: -mfloat-abi=<arg> 2199 2200.. option:: -mfpmath=<arg> 2201 2202.. option:: -mfpu=<arg> 2203 2204.. option:: -mglobal-merge, -mno-global-merge 2205 2206Enable merging of globals 2207 2208.. option:: -mhard-float 2209 2210.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2211 2212.. option:: -miamcu, -mno-iamcu 2213 2214Use Intel MCU ABI 2215 2216.. option:: -mimplicit-float, -mno-implicit-float 2217 2218.. option:: -mimplicit-it=<arg> 2219 2220.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2221 2222(integrated-as) Emit an object file which can be used with an incremental linker 2223 2224.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2225 2226.. option:: -mkernel 2227 2228.. option:: -mlong-calls, -mno-long-calls 2229 2230Generate branches with extended addressability, usually via indirect jumps. 2231 2232.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2233 2234Set macOS deployment target 2235 2236.. option:: -mmcu=<arg> 2237 2238.. option:: -mms-bitfields, -mno-ms-bitfields 2239 2240Set the default structure layout to be compatible with the Microsoft compiler standard 2241 2242.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2243 2244Omit frame pointer setup for leaf functions 2245 2246.. option:: -moslib=<arg> 2247 2248.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2249 2250Use copy relocations support for PIE builds 2251 2252.. option:: -mprefer-vector-width=<arg> 2253 2254Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2255 2256.. option:: -mqdsp6-compat 2257 2258Enable hexagon-qdsp6 backward compatibility 2259 2260.. option:: -mrecip 2261 2262.. program:: clang1 2263.. option:: -mrecip=<arg1>,<arg2>... 2264.. program:: clang 2265 2266.. option:: -mred-zone, -mno-red-zone 2267 2268.. option:: -mregparm=<arg> 2269 2270.. option:: -mrelax-all, -mno-relax-all 2271 2272(integrated-as) Relax all machine instructions 2273 2274.. option:: -mretpoline, -mno-retpoline 2275 2276.. option:: -mrtd, -mno-rtd 2277 2278Make StdCall calling convention the default 2279 2280.. option:: -msign-return-address=<arg> 2281 2282Select return address signing scope 2283 2284.. option:: -msoft-float, -mno-soft-float 2285 2286Use software floating point 2287 2288.. option:: -mstack-alignment=<arg> 2289 2290Set the stack alignment 2291 2292.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2293 2294Enable stack probes 2295 2296.. option:: -mstack-probe-size=<arg> 2297 2298Set the stack probe size 2299 2300.. option:: -mstackrealign, -mno-stackrealign 2301 2302Force realign the stack at entry to every function 2303 2304.. option:: -mthread-model <arg> 2305 2306The thread model to use, e.g. posix, single (posix by default) 2307 2308.. option:: -mthreads<arg> 2309 2310.. option:: -mthumb, -mno-thumb 2311 2312.. option:: -mtune=<arg> 2313 2314Use -mtune=? to see a list of supported cpu models. 2315 2316.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2317 2318.. option:: -municode<arg> 2319 2320.. option:: -mvx, -mno-vx 2321 2322.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2323 2324.. option:: -mwatchos-version-min=<arg> 2325 2326.. option:: -mwindows<arg> 2327 2328.. option:: -mx32 2329 2330AARCH64 2331------- 2332.. option:: -ffixed-x1 2333 2334Reserve the x1 register (AArch64 only) 2335 2336.. option:: -ffixed-x2 2337 2338Reserve the x2 register (AArch64 only) 2339 2340.. option:: -ffixed-x3 2341 2342Reserve the x3 register (AArch64 only) 2343 2344.. option:: -ffixed-x4 2345 2346Reserve the x4 register (AArch64 only) 2347 2348.. option:: -ffixed-x5 2349 2350Reserve the x5 register (AArch64 only) 2351 2352.. option:: -ffixed-x6 2353 2354Reserve the x6 register (AArch64 only) 2355 2356.. option:: -ffixed-x7 2357 2358Reserve the x7 register (AArch64 only) 2359 2360.. option:: -ffixed-x18 2361 2362Reserve the x18 register (AArch64 only) 2363 2364.. option:: -ffixed-x20 2365 2366Reserve the x20 register (AArch64 only) 2367 2368.. option:: -fcall-saved-x8 2369 2370Make the x8 register call-saved (AArch64 only) 2371 2372.. option:: -fcall-saved-x9 2373 2374Make the x9 register call-saved (AArch64 only) 2375 2376.. option:: -fcall-saved-x10 2377 2378Make the x10 register call-saved (AArch64 only) 2379 2380.. option:: -fcall-saved-x11 2381 2382Make the x11 register call-saved (AArch64 only) 2383 2384.. option:: -fcall-saved-x12 2385 2386Make the x12 register call-saved (AArch64 only) 2387 2388.. option:: -fcall-saved-x13 2389 2390Make the x13 register call-saved (AArch64 only) 2391 2392.. option:: -fcall-saved-x14 2393 2394Make the x14 register call-saved (AArch64 only) 2395 2396.. option:: -fcall-saved-x15 2397 2398Make the x15 register call-saved (AArch64 only) 2399 2400.. option:: -fcall-saved-x18 2401 2402Make the x18 register call-saved (AArch64 only) 2403 2404.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2405 2406Workaround Cortex-A53 erratum 835769 (AArch64 only) 2407 2408.. option:: -mgeneral-regs-only 2409 2410Generate code which only uses the general purpose registers (AArch64 only) 2411 2412AMDGPU 2413------ 2414.. option:: -mcumode, -mno-cumode 2415 2416CU wavefront execution mode is used if enabled and WGP wavefront execution mode 2417is used if disabled (AMDGPU only) 2418 2419.. option:: -mwavefrontsize64, -mno-wavefrontsize64 2420 2421Wavefront size 64 is used if enabled and wavefront size 32 if disabled (AMDGPU only) 2422 2423.. option:: -mxnack, -mno-xnack 2424 2425Enable XNACK (AMDGPU only) 2426 2427ARM 2428--- 2429.. option:: -ffixed-r9 2430 2431Reserve the r9 register (ARM only) 2432 2433.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2434 2435Disallow generation of data access to code sections (ARM only) 2436 2437.. option:: -mno-movt 2438 2439Disallow use of movt/movw pairs (ARM only) 2440 2441.. option:: -mno-neg-immediates 2442 2443Disallow converting instructions with negative immediates to their negation or inversion. 2444 2445.. option:: -mnocrc 2446 2447Disallow use of CRC instructions (ARM only) 2448 2449.. option:: -mrestrict-it, -mno-restrict-it 2450 2451Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2452 2453.. option:: -mtp=<arg> 2454 2455Read thread pointer from coprocessor register (ARM only) 2456 2457.. option:: -munaligned-access, -mno-unaligned-access 2458 2459Allow memory accesses to be unaligned (AArch32/AArch64 only) 2460 2461Hexagon 2462------- 2463.. option:: -mieee-rnd-near 2464 2465.. option:: -mmemops, -mno-memops 2466 2467Enable generation of memop instructions 2468 2469.. option:: -mnvj, -mno-nvj 2470 2471Enable generation of new-value jumps 2472 2473.. option:: -mnvs, -mno-nvs 2474 2475Enable generation of new-value stores 2476 2477.. option:: -mpackets, -mno-packets 2478 2479Enable generation of instruction packets 2480 2481Hexagon 2482------- 2483.. option:: -mhvx, -mno-hvx 2484 2485Enable Hexagon Vector eXtensions 2486 2487.. option:: -mhvx-length=<arg> 2488 2489Set Hexagon Vector Length 2490 2491.. program:: clang1 2492.. option:: -mhvx=<arg> 2493.. program:: clang 2494 2495Enable Hexagon Vector eXtensions 2496 2497MIPS 2498---- 2499.. option:: -mabicalls, -mno-abicalls 2500 2501Enable SVR4-style position-independent code (Mips only) 2502 2503.. option:: -mabs=<arg> 2504 2505.. option:: -mcheck-zero-division, -mno-check-zero-division 2506 2507.. option:: -mcompact-branches=<arg> 2508 2509.. option:: -mdouble-float 2510 2511.. option:: -mdsp, -mno-dsp 2512 2513.. option:: -mdspr2, -mno-dspr2 2514 2515.. option:: -membedded-data, -mno-embedded-data 2516 2517Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 2518 2519.. option:: -mextern-sdata, -mno-extern-sdata 2520 2521Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 2522 2523.. option:: -mfp32 2524 2525Use 32-bit floating point registers (MIPS only) 2526 2527.. option:: -mfp64 2528 2529Use 64-bit floating point registers (MIPS only) 2530 2531.. option:: -mginv, -mno-ginv 2532 2533.. option:: -mgpopt, -mno-gpopt 2534 2535Use GP relative accesses for symbols known to be in a small data section (MIPS) 2536 2537.. option:: -mindirect-jump=<arg> 2538 2539Change indirect jump instructions to inhibit speculation 2540 2541.. option:: -mips16 2542 2543.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 2544 2545.. option:: -mlocal-sdata, -mno-local-sdata 2546 2547Extend the -G behaviour to object local data (MIPS) 2548 2549.. option:: -mmadd4, -mno-madd4 2550 2551Enable the generation of 4-operand madd.s, madd.d and related instructions. 2552 2553.. option:: -mmicromips, -mno-micromips 2554 2555.. option:: -mmsa, -mno-msa 2556 2557Enable MSA ASE (MIPS only) 2558 2559.. option:: -mmt, -mno-mt 2560 2561Enable MT ASE (MIPS only) 2562 2563.. option:: -mnan=<arg> 2564 2565.. option:: -mno-mips16 2566 2567.. option:: -msingle-float 2568 2569.. option:: -mvirt, -mno-virt 2570 2571.. option:: -mxgot, -mno-xgot 2572 2573PowerPC 2574------- 2575.. option:: -maltivec, -mno-altivec 2576 2577.. option:: -mcmpb, -mno-cmpb 2578 2579.. option:: -mcrbits, -mno-crbits 2580 2581.. option:: -mcrypto, -mno-crypto 2582 2583.. option:: -mdirect-move, -mno-direct-move 2584 2585.. option:: -mfloat128, -mno-float128 2586 2587.. option:: -mfprnd, -mno-fprnd 2588 2589.. option:: -mhtm, -mno-htm 2590 2591.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 2592 2593.. option:: -misel, -mno-isel 2594 2595.. option:: -mlongcall, -mno-longcall 2596 2597.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 2598 2599.. option:: -mpopcntd, -mno-popcntd 2600 2601.. option:: -mpower8-vector, -mno-power8-vector 2602 2603.. option:: -mpower9-vector, -mno-power9-vector 2604 2605.. option:: -mqpx, -mno-qpx 2606 2607.. option:: -msecure-plt 2608 2609.. option:: -mvsx, -mno-vsx 2610 2611WebAssembly 2612----------- 2613.. option:: -mexception-handling, -mno-exception-handling 2614 2615.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 2616 2617.. option:: -msign-ext, -mno-sign-ext 2618 2619.. option:: -msimd128, -mno-simd128 2620 2621X86 2622--- 2623.. option:: -m3dnow, -mno-3dnow 2624 2625.. option:: -m3dnowa, -mno-3dnowa 2626 2627.. option:: -madx, -mno-adx 2628 2629.. option:: -maes, -mno-aes 2630 2631.. option:: -mavx, -mno-avx 2632 2633.. option:: -mavx2, -mno-avx2 2634 2635.. option:: -mavx512bitalg, -mno-avx512bitalg 2636 2637.. option:: -mavx512bf16, -mno-avx512bf16 2638 2639.. option:: -mavx512bw, -mno-avx512bw 2640 2641.. option:: -mavx512cd, -mno-avx512cd 2642 2643.. option:: -mavx512dq, -mno-avx512dq 2644 2645.. option:: -mavx512er, -mno-avx512er 2646 2647.. option:: -mavx512f, -mno-avx512f 2648 2649.. option:: -mavx512ifma, -mno-avx512ifma 2650 2651.. option:: -mavx512pf, -mno-avx512pf 2652 2653.. option:: -mavx512vbmi, -mno-avx512vbmi 2654 2655.. option:: -mavx512vbmi2, -mno-avx512vbmi2 2656 2657.. option:: -mavx512vl, -mno-avx512vl 2658 2659.. option:: -mavx512vnni, -mno-avx512vnni 2660 2661.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 2662 2663.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 2664 2665.. option:: -mbmi, -mno-bmi 2666 2667.. option:: -mbmi2, -mno-bmi2 2668 2669.. option:: -mcldemote, -mno-cldemote 2670 2671.. option:: -mclflushopt, -mno-clflushopt 2672 2673.. option:: -mclwb, -mno-clwb 2674 2675.. option:: -mclzero, -mno-clzero 2676 2677.. option:: -mcx16, -mno-cx16 2678 2679.. option:: -menqcmd, -mno-enqcmd 2680 2681.. option:: -mf16c, -mno-f16c 2682 2683.. option:: -mfma, -mno-fma 2684 2685.. option:: -mfma4, -mno-fma4 2686 2687.. option:: -mfsgsbase, -mno-fsgsbase 2688 2689.. option:: -mfxsr, -mno-fxsr 2690 2691.. option:: -mgfni, -mno-gfni 2692 2693.. option:: -minvpcid, -mno-invpcid 2694 2695.. option:: -mlwp, -mno-lwp 2696 2697.. option:: -mlzcnt, -mno-lzcnt 2698 2699.. option:: -mmmx, -mno-mmx 2700 2701.. option:: -mmovbe, -mno-movbe 2702 2703.. option:: -mmovdir64b, -mno-movdir64b 2704 2705.. option:: -mmovdiri, -mno-movdiri 2706 2707.. option:: -mmpx, -mno-mpx 2708 2709.. option:: -mmwaitx, -mno-mwaitx 2710 2711.. option:: -mpclmul, -mno-pclmul 2712 2713.. option:: -mpconfig, -mno-pconfig 2714 2715.. option:: -mpku, -mno-pku 2716 2717.. option:: -mpopcnt, -mno-popcnt 2718 2719.. option:: -mprefetchwt1, -mno-prefetchwt1 2720 2721.. option:: -mprfchw, -mno-prfchw 2722 2723.. option:: -mptwrite, -mno-ptwrite 2724 2725.. option:: -mrdpid, -mno-rdpid 2726 2727.. option:: -mrdrnd, -mno-rdrnd 2728 2729.. option:: -mrdseed, -mno-rdseed 2730 2731.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 2732 2733.. option:: -mrtm, -mno-rtm 2734 2735.. option:: -msahf, -mno-sahf 2736 2737.. option:: -msgx, -mno-sgx 2738 2739.. option:: -msha, -mno-sha 2740 2741.. option:: -mshstk, -mno-shstk 2742 2743.. option:: -msse, -mno-sse 2744 2745.. option:: -msse2, -mno-sse2 2746 2747.. option:: -msse3, -mno-sse3 2748 2749.. option:: -msse4.1, -mno-sse4.1 2750 2751.. program:: clang1 2752.. option:: -msse4.2, -mno-sse4.2, -msse4 2753.. program:: clang 2754 2755.. option:: -msse4a, -mno-sse4a 2756 2757.. option:: -mssse3, -mno-ssse3 2758 2759.. option:: -mtbm, -mno-tbm 2760 2761.. option:: -mvaes, -mno-vaes 2762 2763.. option:: -mvpclmulqdq, -mno-vpclmulqdq 2764 2765.. option:: -mwaitpkg, -mno-waitpkg 2766 2767.. option:: -mwbnoinvd, -mno-wbnoinvd 2768 2769.. option:: -mx87, -m80387, -mno-x87 2770 2771.. option:: -mxop, -mno-xop 2772 2773.. option:: -mxsave, -mno-xsave 2774 2775.. option:: -mxsavec, -mno-xsavec 2776 2777.. option:: -mxsaveopt, -mno-xsaveopt 2778 2779.. option:: -mxsaves, -mno-xsaves 2780 2781RISCV 2782----- 2783.. option:: -mrelax, -mno-relax 2784 2785Enable linker relaxation 2786 2787Optimization level 2788~~~~~~~~~~~~~~~~~~ 2789 2790Flags controlling how much optimization should be performed. 2791 2792.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg> 2793 2794.. option:: -Ofast<arg> 2795 2796Debug information generation 2797~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2798 2799Flags controlling how much and what kind of debug information should be 2800generated. 2801 2802Kind and level of debug information 2803----------------------------------- 2804.. option:: -g, --debug, --debug=<arg> 2805 2806Generate source-level debug information 2807 2808.. option:: -gdwarf-2 2809 2810Generate source-level debug information with dwarf version 2 2811 2812.. option:: -gdwarf-3 2813 2814Generate source-level debug information with dwarf version 3 2815 2816.. option:: -gdwarf-4, -gdwarf 2817 2818Generate source-level debug information with dwarf version 4 2819 2820.. option:: -gdwarf-5 2821 2822Generate source-level debug information with dwarf version 5 2823 2824.. option:: -gfull 2825 2826.. option:: -gused 2827 2828Debug level 2829___________ 2830.. option:: -g0 2831 2832.. option:: -g2 2833 2834.. option:: -g3 2835 2836.. option:: -ggdb0 2837 2838.. option:: -ggdb1 2839 2840.. option:: -ggdb2 2841 2842.. option:: -ggdb3 2843 2844.. option:: -gline-tables-only, -g1, -gmlt 2845 2846Emit debug line number tables only 2847 2848.. option:: -gmodules 2849 2850Generate debug info with external references to clang modules or precompiled headers 2851 2852Debugger to tune debug information for 2853______________________________________ 2854.. option:: -ggdb 2855 2856.. option:: -glldb 2857 2858.. option:: -gsce 2859 2860Debug information flags 2861----------------------- 2862.. option:: -gcolumn-info, -gno-column-info 2863 2864.. option:: -gdwarf-aranges 2865 2866.. option:: -gembed-source, -gno-embed-source 2867 2868Embed source text in DWARF debug sections 2869 2870.. option:: -ggnu-pubnames, -gno-gnu-pubnames 2871 2872.. option:: -gpubnames, -gno-pubnames 2873 2874.. option:: -grecord-command-line, -grecord-gcc-switches, -gno-record-command-line, -gno-record-gcc-switches 2875 2876.. option:: -gsplit-dwarf 2877 2878.. option:: -gstrict-dwarf, -gno-strict-dwarf 2879 2880.. option:: -gz 2881 2882DWARF debug sections compression type 2883 2884.. program:: clang1 2885.. option:: -gz=<arg> 2886.. program:: clang 2887 2888DWARF debug sections compression type 2889 2890Static analyzer flags 2891===================== 2892 2893Flags controlling the behavior of the Clang Static Analyzer. 2894 2895.. option:: -Xanalyzer <arg> 2896 2897Pass <arg> to the static analyzer 2898 2899Fortran compilation flags 2900========================= 2901 2902Flags that will be passed onto the ``gfortran`` compiler when Clang is given 2903a Fortran input. 2904 2905.. option:: -A<arg>, --assert <arg>, --assert=<arg> 2906 2907.. option:: -A-<arg> 2908 2909.. option:: -J<arg> 2910 2911.. option:: -cpp 2912 2913.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 2914 2915.. option:: -falign-commons, -fno-align-commons 2916 2917.. option:: -fall-intrinsics, -fno-all-intrinsics 2918 2919.. option:: -fautomatic, -fno-automatic 2920 2921.. option:: -fbackslash, -fno-backslash 2922 2923.. option:: -fbacktrace, -fno-backtrace 2924 2925.. option:: -fblas-matmul-limit=<arg> 2926 2927.. option:: -fbounds-check, -fno-bounds-check 2928 2929.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 2930 2931.. option:: -fcheck=<arg> 2932 2933.. option:: -fcoarray=<arg> 2934 2935.. option:: -fconvert=<arg> 2936 2937.. option:: -fcray-pointer, -fno-cray-pointer 2938 2939.. option:: -fd-lines-as-code, -fno-d-lines-as-code 2940 2941.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 2942 2943.. option:: -fdefault-double-8, -fno-default-double-8 2944 2945.. option:: -fdefault-integer-8, -fno-default-integer-8 2946 2947.. option:: -fdefault-real-8, -fno-default-real-8 2948 2949.. option:: -fdollar-ok, -fno-dollar-ok 2950 2951.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 2952 2953.. option:: -fdump-fortran-original, -fno-dump-fortran-original 2954 2955.. option:: -fdump-parse-tree, -fno-dump-parse-tree 2956 2957.. option:: -fexternal-blas, -fno-external-blas 2958 2959.. option:: -ff2c, -fno-f2c 2960 2961.. option:: -ffixed-form, -fno-fixed-form 2962 2963.. option:: -ffixed-line-length-<arg> 2964 2965.. option:: -ffpe-trap=<arg> 2966 2967.. option:: -ffree-form, -fno-free-form 2968 2969.. option:: -ffree-line-length-<arg> 2970 2971.. option:: -ffrontend-optimize, -fno-frontend-optimize 2972 2973.. option:: -fimplicit-none, -fno-implicit-none 2974 2975.. option:: -finit-character=<arg> 2976 2977.. option:: -finit-integer=<arg> 2978 2979.. option:: -finit-local-zero, -fno-init-local-zero 2980 2981.. option:: -finit-logical=<arg> 2982 2983.. option:: -finit-real=<arg> 2984 2985.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 2986 2987.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 2988 2989.. option:: -fmax-array-constructor=<arg> 2990 2991.. option:: -fmax-errors=<arg> 2992 2993.. option:: -fmax-identifier-length, -fno-max-identifier-length 2994 2995.. option:: -fmax-stack-var-size=<arg> 2996 2997.. option:: -fmax-subrecord-length=<arg> 2998 2999.. option:: -fmodule-private, -fno-module-private 3000 3001.. option:: -fpack-derived, -fno-pack-derived 3002 3003.. option:: -fprotect-parens, -fno-protect-parens 3004 3005.. option:: -frange-check, -fno-range-check 3006 3007.. option:: -freal-4-real-10, -fno-real-4-real-10 3008 3009.. option:: -freal-4-real-16, -fno-real-4-real-16 3010 3011.. option:: -freal-4-real-8, -fno-real-4-real-8 3012 3013.. option:: -freal-8-real-10, -fno-real-8-real-10 3014 3015.. option:: -freal-8-real-16, -fno-real-8-real-16 3016 3017.. option:: -freal-8-real-4, -fno-real-8-real-4 3018 3019.. option:: -frealloc-lhs, -fno-realloc-lhs 3020 3021.. option:: -frecord-marker=<arg> 3022 3023.. option:: -frecursive, -fno-recursive 3024 3025.. option:: -frepack-arrays, -fno-repack-arrays 3026 3027.. option:: -fsecond-underscore, -fno-second-underscore 3028 3029.. option:: -fsign-zero, -fno-sign-zero 3030 3031.. option:: -fstack-arrays, -fno-stack-arrays 3032 3033.. option:: -funderscoring, -fno-underscoring 3034 3035.. option:: -fwhole-file, -fno-whole-file 3036 3037.. option:: -imultilib <arg> 3038 3039.. option:: -nocpp 3040 3041.. option:: -static-libgfortran 3042 3043Linker flags 3044============ 3045Flags that are passed on to the linker 3046 3047.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3048 3049Add directory to library search path 3050 3051.. option:: -Mach 3052 3053.. option:: -T<script> 3054 3055Specify <script> as linker script 3056 3057.. option:: -Tbss<addr> 3058 3059Set starting address of BSS to <addr> 3060 3061.. option:: -Tdata<addr> 3062 3063Set starting address of DATA to <addr> 3064 3065.. option:: -Ttext<addr> 3066 3067Set starting address of TEXT to <addr> 3068 3069.. option:: -Wl,<arg>,<arg2>... 3070 3071Pass the comma separated arguments in <arg> to the linker 3072 3073.. option:: -X 3074 3075.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3076 3077Pass <arg> to the linker 3078 3079.. program:: clang1 3080.. option:: -Z 3081.. program:: clang 3082 3083.. option:: -e<arg>, --entry 3084 3085.. option:: -filelist <arg> 3086 3087.. option:: --hip-device-lib-path=<arg> 3088 3089HIP device library path 3090 3091.. option:: --hip-device-lib=<arg> 3092 3093HIP device library 3094 3095.. option:: -l<arg> 3096 3097.. option:: -r 3098 3099.. option:: -rpath <arg> 3100 3101.. option:: -s 3102 3103.. option:: -t 3104 3105.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3106 3107.. option:: -undef 3108 3109undef all system defines 3110 3111.. option:: -undefined<arg>, --no-undefined 3112 3113.. option:: -z <arg> 3114 3115Pass -z <arg> to the linker 3116 3117