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 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 48 49Emit metadata containing compiler name and version 50 51.. option:: -Wa,<arg>,<arg2>... 52 53Pass the comma separated arguments in <arg> to the assembler 54 55.. option:: -Wlarge-by-value-copy=<arg> 56 57.. option:: -Xarch\_<arg1> <arg2> 58 59.. option:: -Xcuda-fatbinary <arg> 60 61Pass <arg> to fatbinary invocation 62 63.. option:: -Xcuda-ptxas <arg> 64 65Pass <arg> to the ptxas assembler 66 67.. option:: -Xopenmp-target <arg> 68 69Pass <arg> to the target offloading toolchain. 70 71.. program:: clang1 72.. option:: -Xopenmp-target=<triple> <arg> 73.. program:: clang 74 75Pass <arg> to the target offloading toolchain identified by <triple>. 76 77.. option:: -Z<arg> 78 79.. option:: -a<arg>, --profile-blocks 80 81.. option:: -all\_load 82 83.. option:: -allowable\_client <arg> 84 85.. option:: --analyze 86 87Run the static analyzer 88 89.. option:: --analyze-auto 90 91.. option:: --analyzer-no-default-checks 92 93.. option:: --analyzer-output<arg> 94 95Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|text). 96 97.. option:: -ansi, --ansi 98 99.. option:: -arch <arg> 100 101.. program:: clang1 102.. option:: -arch\_errors\_fatal 103.. program:: clang 104 105.. program:: clang2 106.. option:: -arch\_only <arg> 107.. program:: clang 108 109.. option:: -arcmt-migrate-emit-errors 110 111Emit ARC errors even if the migrator can fix them 112 113.. option:: -arcmt-migrate-report-output <arg> 114 115Output path for the plist report 116 117.. option:: --autocomplete=<arg> 118 119.. option:: -bind\_at\_load 120 121.. option:: -bundle 122 123.. program:: clang1 124.. option:: -bundle\_loader <arg> 125.. program:: clang 126 127.. option:: -cfguard 128 129Emit tables required for Windows Control Flow Guard. 130 131.. option:: -client\_name<arg> 132 133.. option:: -compatibility\_version<arg> 134 135.. option:: --config <arg> 136 137Specifies configuration file 138 139.. option:: --constant-cfstrings 140 141.. option:: -coverage, --coverage 142 143.. option:: --cuda-compile-host-device 144 145Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 146 147.. option:: --cuda-device-only 148 149Compile CUDA code for device only 150 151.. option:: --cuda-gpu-arch=<arg>, --no-cuda-gpu-arch=<arg> 152 153CUDA GPU architecture (e.g. sm\_35). May be specified more than once. 154 155.. option:: --cuda-host-only 156 157Compile CUDA code for host only. Has no effect on non-CUDA compilations. 158 159.. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> 160 161Include PTX for the follwing GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. 162 163.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 164 165Enable device-side debug info generation. Disables ptxas optimizations. 166 167.. option:: -current\_version<arg> 168 169.. option:: -dead\_strip 170 171.. option:: -dependency-dot <arg> 172 173Filename to write DOT-formatted header dependencies to 174 175.. option:: -dependency-file <arg> 176 177Filename (or -) to write dependency output to 178 179.. option:: -dumpmachine 180 181.. option:: -dumpversion 182 183.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 184 185.. option:: -dylib\_file <arg> 186 187.. option:: -dylinker 188 189.. program:: clang1 190.. option:: -dylinker\_install\_name<arg> 191.. program:: clang 192 193.. option:: -dynamic 194 195.. option:: -dynamiclib 196 197.. option:: -emit-ast 198 199Emit Clang AST files for source inputs 200 201.. option:: -exported\_symbols\_list <arg> 202 203.. option:: -faligned-new=<arg> 204 205.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 206 207Use approximate transcendental functions 208 209.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero 210 211Flush denormal floating point values to zero in CUDA device mode. 212 213.. option:: -fcuda-rdc, -fno-cuda-rdc 214 215Generate relocatable device code, also known as separate compilation mode. 216 217.. option:: -ffixed-r19 218 219Reserve the r19 register (Hexagon only) 220 221.. option:: -fheinous-gnu-extensions 222 223.. option:: -flat\_namespace 224 225.. option:: -fopenmp-targets=<arg1>,<arg2>... 226 227Specify comma-separated list of triples OpenMP offloading targets to be supported 228 229.. option:: -force\_cpusubtype\_ALL 230 231.. program:: clang1 232.. option:: -force\_flat\_namespace 233.. program:: clang 234 235.. program:: clang2 236.. option:: -force\_load <arg> 237.. program:: clang 238 239.. option:: -framework <arg> 240 241.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 242 243Add -rpath with architecture-specific resource directory to the linker flags 244 245.. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> 246 247Use the gcc toolchain at the given directory 248 249.. option:: -gcodeview 250 251Generate CodeView debug information 252 253.. option:: -headerpad\_max\_install\_names<arg> 254 255.. option:: -help, --help 256 257Display available options 258 259.. option:: --help-hidden 260 261Display help for hidden options 262 263.. option:: -image\_base <arg> 264 265.. option:: -index-header-map 266 267Make the next included directory (-I or -F) an indexer header map 268 269.. option:: -init <arg> 270 271.. option:: -install\_name <arg> 272 273.. option:: -keep\_private\_externs 274 275.. option:: -lazy\_framework <arg> 276 277.. program:: clang1 278.. option:: -lazy\_library <arg> 279.. program:: clang 280 281.. option:: -mbig-endian, -EB 282 283.. option:: --migrate 284 285Run the migrator 286 287.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 288 289.. option:: -mlinker-version=<arg> 290 291.. option:: -mlittle-endian, -EL 292 293.. option:: -mllvm <arg> 294 295Additional arguments to forward to LLVM's option processing 296 297.. option:: -module-dependency-dir <arg> 298 299Directory to dump module dependencies to 300 301.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 302 303.. option:: -multi\_module 304 305.. option:: -multiply\_defined <arg> 306 307.. program:: clang1 308.. option:: -multiply\_defined\_unused <arg> 309.. program:: clang 310 311.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 312 313.. option:: --no-cuda-version-check 314 315Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 316 317.. option:: -no-integrated-cpp, --no-integrated-cpp 318 319.. option:: -no\_dead\_strip\_inits\_and\_terms 320 321.. option:: -nobuiltininc 322 323Disable builtin #include directories 324 325.. option:: -nocudainc 326 327.. option:: -nocudalib 328 329.. option:: -nodefaultlibs 330 331.. option:: -nofixprebinding 332 333.. option:: -nolibc 334 335.. option:: -nomultidefs 336 337.. option:: -nopie, -no-pie 338 339.. option:: -noprebind 340 341.. option:: -noseglinkedit 342 343.. option:: -nostartfiles 344 345.. option:: -nostdinc, --no-standard-includes 346 347.. program:: clang1 348.. option:: -nostdinc++ 349.. program:: clang 350 351Disable standard #include directories for the C++ standard library 352 353.. option:: -nostdlib, --no-standard-libraries 354 355.. program:: clang1 356.. option:: -nostdlib++ 357.. program:: clang 358 359.. option:: -nostdlibinc 360 361.. option:: -o<file>, --output <arg>, --output=<arg> 362 363Write output to <file> 364 365.. option:: -objcmt-atomic-property 366 367Make migration to 'atomic' properties 368 369.. option:: -objcmt-migrate-all 370 371Enable migration to modern ObjC 372 373.. option:: -objcmt-migrate-annotation 374 375Enable migration to property and method annotations 376 377.. option:: -objcmt-migrate-designated-init 378 379Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 380 381.. option:: -objcmt-migrate-instancetype 382 383Enable migration to infer instancetype for method result type 384 385.. option:: -objcmt-migrate-literals 386 387Enable migration to modern ObjC literals 388 389.. option:: -objcmt-migrate-ns-macros 390 391Enable migration to NS\_ENUM/NS\_OPTIONS macros 392 393.. option:: -objcmt-migrate-property 394 395Enable migration to modern ObjC property 396 397.. option:: -objcmt-migrate-property-dot-syntax 398 399Enable migration of setter/getter messages to property-dot syntax 400 401.. option:: -objcmt-migrate-protocol-conformance 402 403Enable migration to add protocol conformance on classes 404 405.. option:: -objcmt-migrate-readonly-property 406 407Enable migration to modern ObjC readonly property 408 409.. option:: -objcmt-migrate-readwrite-property 410 411Enable migration to modern ObjC readwrite property 412 413.. option:: -objcmt-migrate-subscripting 414 415Enable migration to modern ObjC subscripting 416 417.. option:: -objcmt-ns-nonatomic-iosonly 418 419Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 420 421.. option:: -objcmt-returns-innerpointer-property 422 423Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 424 425.. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> 426 427Only modify files with a filename contained in the provided directory path 428 429.. option:: -object 430 431.. option:: -p, --profile 432 433.. option:: -pagezero\_size<arg> 434 435.. option:: -pg 436 437Enable mcount instrumentation 438 439.. option:: -pie 440 441.. option:: -pipe, --pipe 442 443Use pipes between commands, when possible 444 445.. option:: -prebind 446 447.. program:: clang1 448.. option:: -prebind\_all\_twolevel\_modules 449.. program:: clang 450 451.. option:: -preload 452 453.. option:: --print-diagnostic-categories 454 455.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 456 457Print the full library path of <file> 458 459.. option:: -print-ivar-layout 460 461Enable Objective-C Ivar layout bitmap print trace 462 463.. option:: -print-libgcc-file-name, --print-libgcc-file-name 464 465Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 466 467.. option:: -print-multi-directory, --print-multi-directory 468 469.. option:: -print-multi-lib, --print-multi-lib 470 471.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 472 473Print the full program path of <name> 474 475.. option:: -print-resource-dir, --print-resource-dir 476 477Print the resource directory pathname 478 479.. option:: -print-search-dirs, --print-search-dirs 480 481Print the paths used for finding libraries and programs 482 483.. option:: -private\_bundle 484 485.. option:: -pthread, -no-pthread 486 487Support POSIX threads in generated code 488 489.. option:: -pthreads 490 491.. option:: -rdynamic 492 493.. option:: -read\_only\_relocs <arg> 494 495.. option:: -relocatable-pch, --relocatable-pch 496 497Whether to build a relocatable precompiled header 498 499.. option:: -remap 500 501.. option:: -rewrite-legacy-objc 502 503Rewrite Legacy Objective-C source to C++ 504 505.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 506 507Compiler runtime library to use 508 509.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 510 511Save llvm statistics. 512 513.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 514 515Save intermediate compilation results. 516 517.. option:: -sectalign <arg1> <arg2> <arg3> 518 519.. option:: -sectcreate <arg1> <arg2> <arg3> 520 521.. option:: -sectobjectsymbols <arg1> <arg2> 522 523.. option:: -sectorder <arg1> <arg2> <arg3> 524 525.. option:: -seg1addr<arg> 526 527.. option:: -seg\_addr\_table <arg> 528 529.. program:: clang1 530.. option:: -seg\_addr\_table\_filename <arg> 531.. program:: clang 532 533.. option:: -segaddr <arg1> <arg2> 534 535.. option:: -segcreate <arg1> <arg2> <arg3> 536 537.. option:: -seglinkedit 538 539.. option:: -segprot <arg1> <arg2> <arg3> 540 541.. option:: -segs\_read\_<arg> 542 543.. program:: clang1 544.. option:: -segs\_read\_only\_addr <arg> 545.. program:: clang 546 547.. program:: clang2 548.. option:: -segs\_read\_write\_addr <arg> 549.. program:: clang 550 551.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 552 553Serialize compiler diagnostics to a file 554 555.. option:: -shared, --shared 556 557.. option:: -shared-libgcc 558 559.. option:: -shared-libsan, -shared-libasan 560 561.. option:: -single\_module 562 563.. option:: -specs=<arg>, --specs=<arg> 564 565.. option:: -static, --static 566 567.. option:: -static-libgcc 568 569.. option:: -static-libsan 570 571.. option:: -static-libstdc++ 572 573.. option:: -std-default=<arg> 574 575.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 576 577C++ standard library to use 578 579.. option:: -sub\_library<arg> 580 581.. program:: clang1 582.. option:: -sub\_umbrella<arg> 583.. program:: clang 584 585.. option:: --sysroot=<arg>, --sysroot <arg> 586 587.. option:: --target-help 588 589.. option:: --target=<arg>, -target <arg> 590 591Generate code for the given target 592 593.. option:: -time 594 595Time individual commands 596 597.. option:: -traditional, --traditional 598 599.. option:: -traditional-cpp, --traditional-cpp 600 601Enable some traditional CPP emulation 602 603.. option:: -twolevel\_namespace 604 605.. program:: clang1 606.. option:: -twolevel\_namespace\_hints 607.. program:: clang 608 609.. option:: -umbrella <arg> 610 611.. option:: -unexported\_symbols\_list <arg> 612 613.. option:: -v, --verbose 614 615Show commands to run and use verbose output 616 617.. option:: --verify-debug-info 618 619Verify the binary representation of debug output 620 621.. option:: --version 622 623Print version information 624 625.. option:: -w, --no-warnings 626 627Suppress all warnings 628 629.. option:: -weak-l<arg> 630 631.. option:: -weak\_framework <arg> 632 633.. program:: clang1 634.. option:: -weak\_library <arg> 635.. program:: clang 636 637.. program:: clang2 638.. option:: -weak\_reference\_mismatches <arg> 639.. program:: clang 640 641.. option:: -whatsloaded 642 643.. option:: -whyload 644 645.. option:: -working-directory<arg>, -working-directory=<arg> 646 647Resolve file paths relative to the specified directory 648 649.. option:: -x<language>, --language <arg>, --language=<arg> 650 651Treat subsequent input files as having type <language> 652 653.. option:: -y<arg> 654 655Actions 656======= 657The action to perform on the input. 658 659.. option:: -E, --preprocess 660 661Only run the preprocessor 662 663.. option:: -S, --assemble 664 665Only run preprocess and compilation steps 666 667.. option:: -c, --compile 668 669Only run preprocess, compile, and assemble steps 670 671.. option:: -emit-llvm 672 673Use the LLVM representation for assembler and object files 674 675.. option:: -fsyntax-only 676 677.. option:: -module-file-info 678 679Provide information about a particular module file 680 681.. option:: --precompile 682 683Only precompile the input 684 685.. option:: -rewrite-objc 686 687Rewrite Objective-C source to C++ 688 689.. option:: -verify-pch 690 691Load and verify that a pre-compiled header file is not stale 692 693Compilation flags 694================= 695 696Flags controlling the behavior of Clang during compilation. These flags have 697no effect during actions that do not perform compilation. 698 699.. option:: -Xassembler <arg> 700 701Pass <arg> to the assembler 702 703.. option:: -Xclang <arg> 704 705Pass <arg> to the clang compiler 706 707.. option:: -fclang-abi-compat=<version> 708 709Attempt to match the ABI of Clang <version> 710 711.. option:: -fcomment-block-commands=<arg>,<arg2>... 712 713Treat each comma separated argument in <arg> as a documentation comment block command 714 715.. option:: -fdeclspec, -fno-declspec 716 717Allow \_\_declspec as a keyword 718 719.. option:: -fdepfile-entry=<arg> 720 721.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 722 723.. option:: -fdiagnostics-format=<arg> 724 725.. option:: -fdiagnostics-parseable-fixits 726 727Print fix-its in machine parseable form 728 729.. option:: -fdiagnostics-print-source-range-info 730 731Print source range spans in numeric form 732 733.. option:: -fdiagnostics-show-category=<arg> 734 735.. option:: -fdiscard-value-names, -fno-discard-value-names 736 737Discard value names in LLVM IR 738 739.. option:: -fexperimental-isel, -fno-experimental-isel 740 741Enables the experimental global instruction selector 742 743.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 744 745Enables an experimental new pass manager in LLVM. 746 747.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 748 749Use separate accesses for bitfields with legal widths and alignments. 750 751.. option:: -finline-functions, -fno-inline-functions 752 753Inline suitable functions 754 755.. option:: -finline-hint-functions 756 757Inline functions which are (explicitly or implicitly) marked inline 758 759.. option:: -fno-crash-diagnostics 760 761Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 762 763.. option:: -fno-sanitize-blacklist 764 765Don't use blacklist file for sanitizers 766 767.. option:: -fparse-all-comments 768 769.. option:: -fsanitize-address-field-padding=<arg> 770 771Level of field padding for AddressSanitizer 772 773.. option:: -fsanitize-address-globals-dead-stripping 774 775Enable linker dead stripping of globals in AddressSanitizer 776 777.. option:: -fsanitize-address-poison-class-member-array-new-cookie, -fno-sanitize-address-poison-class-member-array-new-cookie 778 779Enable poisoning array cookies when using class member operator new\[\] in AddressSanitizer 780 781.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 782 783Enable use-after-scope detection in AddressSanitizer 784 785.. option:: -fsanitize-blacklist=<arg> 786 787Path to blacklist file for sanitizers 788 789.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 790 791Enable control flow integrity (CFI) checks for cross-DSO calls. 792 793.. option:: -fsanitize-cfi-icall-generalize-pointers 794 795Generalize pointers in CFI indirect call type signature checks 796 797.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 798 799Specify the type of coverage instrumentation for Sanitizers 800 801.. option:: -fsanitize-link-c++-runtime 802 803.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 804 805Enable origins tracking in MemorySanitizer 806 807.. program:: clang1 808.. option:: -fsanitize-memory-track-origins=<arg> 809.. program:: clang 810 811Enable origins tracking in MemorySanitizer 812 813.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 814 815Enable use-after-destroy detection in MemorySanitizer 816 817.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 818 819.. option:: -fsanitize-recover, -fno-sanitize-recover 820 821.. program:: clang1 822.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>... 823.. program:: clang 824 825Enable recovery for specified sanitizers 826 827.. option:: -fsanitize-stats, -fno-sanitize-stats 828 829Enable sanitizer statistics gathering. 830 831.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 832 833Enable atomic operations instrumentation in ThreadSanitizer (default) 834 835.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 836 837Enable function entry/exit instrumentation in ThreadSanitizer (default) 838 839.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 840 841Enable memory access instrumentation in ThreadSanitizer (default) 842 843.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>... 844 845Enable trapping for specified sanitizers 846 847.. option:: -fsanitize-undefined-strip-path-components=<number> 848 849Strip (or keep only, if negative) a given number of path components when emitting check metadata. 850 851.. option:: -fsanitize-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error 852 853.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 854 855Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 856 857.. option:: --param <arg>, --param=<arg> 858 859.. option:: -std=<arg>, --std=<arg>, --std <arg> 860 861Language standard to compile for 862 863Preprocessor flags 864~~~~~~~~~~~~~~~~~~ 865 866Flags controlling the behavior of the Clang preprocessor. 867 868.. option:: -C, --comments 869 870Include comments in preprocessed output 871 872.. option:: -CC, --comments-in-macros 873 874Include comments from within macros in preprocessed output 875 876.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 877 878Define <macro> to <value> (or 1 if <value> omitted) 879 880.. option:: -H, --trace-includes 881 882Show header includes and nesting depth 883 884.. option:: -P, --no-line-commands 885 886Disable linemarker output in -E mode 887 888.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 889 890Undefine macro <macro> 891 892.. option:: -Wp,<arg>,<arg2>... 893 894Pass the comma separated arguments in <arg> to the preprocessor 895 896.. option:: -Xpreprocessor <arg> 897 898Pass <arg> to the preprocessor 899 900Include path management 901----------------------- 902 903Flags controlling how ``#include``\s are resolved to files. 904 905.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 906 907Add directory to include search path 908 909.. option:: -I-, --include-barrier 910 911Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 912 913.. option:: --cuda-path-ignore-env 914 915Ignore environment variables to detect CUDA installation 916 917.. option:: --cuda-path=<arg> 918 919CUDA installation path 920 921.. option:: -cxx-isystem<directory> 922 923Add directory to the C++ SYSTEM include search path 924 925.. option:: -fbuild-session-file=<file> 926 927Use the last modification time of <file> as the build session timestamp 928 929.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 930 931Time when the current build session started 932 933.. option:: -fmodule-file=\[<name>=\]<file> 934 935Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 936 937.. option:: -fmodules-cache-path=<directory> 938 939Specify the module cache path 940 941.. option:: -fmodules-disable-diagnostic-validation 942 943Disable validation of the diagnostic options when loading the module 944 945.. option:: -fmodules-prune-after=<seconds> 946 947Specify the interval (in seconds) after which a module file will be considered unused 948 949.. option:: -fmodules-prune-interval=<seconds> 950 951Specify the interval (in seconds) between attempts to prune the module cache 952 953.. option:: -fmodules-user-build-path <directory> 954 955Specify the module user build path 956 957.. option:: -fmodules-validate-once-per-build-session 958 959Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 960 961.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 962 963Validate the system headers that a module depends on when loading the module 964 965.. option:: -fprebuilt-module-path=<directory> 966 967Specify the prebuilt module path 968 969.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 970 971Add directory to AFTER include search path 972 973.. option:: -iframework<arg> 974 975Add directory to SYSTEM framework search path 976 977.. option:: -iframeworkwithsysroot<directory> 978 979Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 980 981.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 982 983Include macros from file before parsing 984 985.. option:: -include<file>, --include<file>, --include=<arg> 986 987Include file before parsing 988 989.. option:: -include-pch <file> 990 991Include precompiled header file 992 993.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 994 995Set the -iwithprefix/-iwithprefixbefore prefix 996 997.. option:: -iquote<directory> 998 999Add directory to QUOTE include search path 1000 1001.. option:: -isysroot<dir> 1002 1003Set the system root directory (usually /) 1004 1005.. option:: -isystem<directory> 1006 1007Add directory to SYSTEM include search path 1008 1009.. option:: -isystem-after<directory> 1010 1011Add directory to end of the SYSTEM include search path 1012 1013.. option:: -ivfsoverlay<arg> 1014 1015Overlay the virtual filesystem described by file over the real file system 1016 1017.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1018 1019Set directory to SYSTEM include search path with prefix 1020 1021.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1022 1023Set directory to include search path with prefix 1024 1025.. option:: -iwithsysroot<directory> 1026 1027Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1028 1029.. option:: --ptxas-path=<arg> 1030 1031Path to ptxas (used for compiling CUDA code) 1032 1033.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1034 1035Treat all #include paths starting with <prefix> as including a system header. 1036 1037Dependency file generation 1038-------------------------- 1039 1040Flags controlling generation of a dependency file for ``make``-like build 1041systems. 1042 1043.. option:: -M, --dependencies 1044 1045Like -MD, but also implies -E and writes to stdout by default 1046 1047.. option:: -MD, --write-dependencies 1048 1049Write a depfile containing user and system headers 1050 1051.. option:: -MF<file> 1052 1053Write depfile output from -MMD, -MD, -MM, or -M to <file> 1054 1055.. option:: -MG, --print-missing-file-dependencies 1056 1057Add missing headers to depfile 1058 1059.. option:: -MJ<arg> 1060 1061Write a compilation database entry per input 1062 1063.. option:: -MM, --user-dependencies 1064 1065Like -MMD, but also implies -E and writes to stdout by default 1066 1067.. option:: -MMD, --write-user-dependencies 1068 1069Write a depfile containing user headers 1070 1071.. option:: -MP 1072 1073Create phony target for each dependency (other than main file) 1074 1075.. option:: -MQ<arg> 1076 1077Specify name of main file output to quote in depfile 1078 1079.. option:: -MT<arg> 1080 1081Specify name of main file output in depfile 1082 1083.. option:: -MV 1084 1085Use NMake/Jom format for the depfile 1086 1087Dumping preprocessor state 1088-------------------------- 1089 1090Flags allowing the state of the preprocessor to be dumped in various ways. 1091 1092.. option:: -d 1093 1094.. program:: clang1 1095.. option:: -d<arg> 1096.. program:: clang 1097 1098.. option:: -dA 1099 1100.. option:: -dD 1101 1102Print macro definitions in -E mode in addition to normal output 1103 1104.. option:: -dI 1105 1106Print include directives in -E mode in addition to normal output 1107 1108.. option:: -dM 1109 1110Print macro definitions in -E mode instead of normal output 1111 1112Diagnostic flags 1113~~~~~~~~~~~~~~~~ 1114 1115Flags controlling which warnings, errors, and remarks Clang will generate. 1116See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1117 1118.. option:: -R<remark> 1119 1120Enable the specified remark 1121 1122.. option:: -Rpass-analysis=<arg> 1123 1124Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1125 1126.. option:: -Rpass-missed=<arg> 1127 1128Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1129 1130.. option:: -Rpass=<arg> 1131 1132Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1133 1134.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1135 1136Enable the specified warning 1137 1138.. option:: -Wdeprecated, -Wno-deprecated 1139 1140Enable warnings for deprecated constructs and define \_\_DEPRECATED 1141 1142.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1143 1144Target-independent compilation options 1145~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1146.. option:: -Wframe-larger-than=<arg> 1147 1148.. option:: -fPIC, -fno-PIC 1149 1150.. option:: -fPIE, -fno-PIE 1151 1152.. option:: -faccess-control, -fno-access-control 1153 1154.. option:: -falign-functions, -fno-align-functions 1155 1156.. program:: clang1 1157.. option:: -falign-functions=<arg> 1158.. program:: clang 1159 1160.. program:: clang1 1161.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1162.. program:: clang 1163 1164Enable C++17 aligned allocation functions 1165 1166.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1167 1168Treat editor placeholders as valid source code 1169 1170.. option:: -fallow-unsupported 1171 1172.. option:: -faltivec, -fno-altivec 1173 1174.. option:: -fansi-escape-codes 1175 1176Use ANSI escape codes for diagnostics 1177 1178.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1179 1180Use Apple's kernel extensions ABI 1181 1182.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1183 1184Enable Apple gcc-compatible #pragma pack handling 1185 1186.. option:: -fapplication-extension, -fno-application-extension 1187 1188Restrict code to those available for App Extensions 1189 1190.. option:: -fasm, -fno-asm 1191 1192.. option:: -fasm-blocks, -fno-asm-blocks 1193 1194.. option:: -fassociative-math, -fno-associative-math 1195 1196.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1197 1198.. option:: -fast 1199 1200.. option:: -fastcp 1201 1202.. option:: -fastf 1203 1204.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1205 1206.. option:: -fautolink, -fno-autolink 1207 1208.. option:: -fblocks, -fno-blocks 1209 1210Enable the 'blocks' language feature 1211 1212.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1213 1214.. option:: -fborland-extensions, -fno-borland-extensions 1215 1216Accept non-standard constructs supported by the Borland compiler 1217 1218.. option:: -fbracket-depth=<arg> 1219 1220.. option:: -fbuiltin, -fno-builtin 1221 1222.. option:: -fbuiltin-module-map 1223 1224Load the clang builtins module map file. 1225 1226.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1227 1228.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1229 1230Instrument control-flow architecture protection. Options: return, branch, full, none. 1231 1232.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1233 1234.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1235 1236Use colors in diagnostics 1237 1238.. option:: -fcommon, -fno-common 1239 1240.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1241 1242.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1243 1244.. option:: -fconstant-string-class=<arg> 1245 1246.. option:: -fconstexpr-backtrace-limit=<arg> 1247 1248.. option:: -fconstexpr-depth=<arg> 1249 1250.. option:: -fconstexpr-steps=<arg> 1251 1252.. option:: -fcoroutines-ts, -fno-coroutines-ts 1253 1254Enable support for the C++ Coroutines TS 1255 1256.. option:: -fcoverage-mapping, -fno-coverage-mapping 1257 1258Generate coverage mapping to enable code coverage analysis 1259 1260.. option:: -fcreate-profile 1261 1262.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1263 1264Enable C++ exceptions 1265 1266.. option:: -fcxx-modules, -fno-cxx-modules 1267 1268.. option:: -fdata-sections, -fno-data-sections 1269 1270Place each data in its own section (ELF Only) 1271 1272.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1273 1274Emit extra debug info to make sample profile more accurate. 1275 1276.. option:: -fdebug-macro, -fno-debug-macro 1277 1278Emit macro debug information 1279 1280.. option:: -fdebug-pass-arguments 1281 1282.. option:: -fdebug-pass-structure 1283 1284.. option:: -fdebug-prefix-map=<arg> 1285 1286remap file source paths in debug info 1287 1288.. option:: -fdebug-types-section, -fno-debug-types-section 1289 1290Place debug types in their own section (ELF Only) 1291 1292.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1293 1294Parse templated function definitions at the end of the translation unit 1295 1296.. option:: -fdenormal-fp-math=<arg> 1297 1298.. option:: -fdiagnostics-absolute-paths 1299 1300Print absolute paths in diagnostics 1301 1302.. option:: -fdiagnostics-color, -fno-diagnostics-color 1303 1304.. program:: clang1 1305.. option:: -fdiagnostics-color=<arg> 1306.. program:: clang 1307 1308.. option:: -fdiagnostics-hotness-threshold=<number> 1309 1310Prevent optimization remarks from being output if they do not have at least this profile count 1311 1312.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1313 1314Enable profile hotness information in diagnostic line 1315 1316.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1317 1318Display include stacks for diagnostic notes 1319 1320.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1321 1322Print option name with mappable diagnostics 1323 1324.. option:: -fdiagnostics-show-template-tree 1325 1326Print a template comparison tree for differing templates 1327 1328.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1329 1330Allow '$' in identifiers 1331 1332.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1333 1334Enable '\[\[\]\]' attributes in all C and C++ language modes 1335 1336.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1337 1338.. option:: -fdwarf-exceptions 1339 1340Use DWARF style exceptions 1341 1342.. option:: -felide-constructors, -fno-elide-constructors 1343 1344.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1345 1346.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1347 1348Embed LLVM bitcode (option: off, all, bitcode, marker) 1349 1350.. option:: -femit-all-decls 1351 1352Emit all declarations, even if unused 1353 1354.. option:: -femulated-tls, -fno-emulated-tls 1355 1356Use emutls functions to access thread\_local variables 1357 1358.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1359 1360.. option:: -ferror-limit=<arg> 1361 1362.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1363 1364.. option:: -fexceptions, -fno-exceptions 1365 1366Enable support for exception handling 1367 1368.. option:: -fexec-charset=<arg> 1369 1370.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1371 1372.. option:: -ffast-math, -fno-fast-math 1373 1374Allow aggressive, lossy floating-point optimizations 1375 1376.. option:: -ffinite-math-only, -fno-finite-math-only 1377 1378.. option:: -ffor-scope, -fno-for-scope 1379 1380.. option:: -fforce-enable-int128, -fno-force-enable-int128 1381 1382Enable support for int128\_t type 1383 1384.. option:: -ffp-contract=<arg> 1385 1386Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma, default) \| off (never fuse) 1387 1388.. option:: -ffreestanding 1389 1390Assert that the compilation takes place in a freestanding environment 1391 1392.. option:: -ffunction-sections, -fno-function-sections 1393 1394Place each function in its own section (ELF Only) 1395 1396.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1397 1398.. option:: -fgnu-keywords, -fno-gnu-keywords 1399 1400Allow GNU-extension keywords regardless of language standard 1401 1402.. option:: -fgnu-runtime 1403 1404Generate output compatible with the standard GNU Objective-C runtime 1405 1406.. option:: -fgnu89-inline, -fno-gnu89-inline 1407 1408Use the gnu89 inline semantics 1409 1410.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1411 1412.. option:: -fhonor-nans, -fno-honor-nans 1413 1414.. option:: -fhosted 1415 1416.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1417 1418Implicitly search the file system for module map files. 1419 1420.. option:: -fimplicit-modules, -fno-implicit-modules 1421 1422.. option:: -finput-charset=<arg> 1423 1424.. option:: -finstrument-function-entry-bare 1425 1426Instrument function entry only, after inlining, without arguments to the instrumentation call 1427 1428.. option:: -finstrument-functions 1429 1430Generate calls to instrument function entry and exit 1431 1432.. option:: -finstrument-functions-after-inlining 1433 1434Like -finstrument-functions, but insert the calls after inlining 1435 1436.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1437 1438Enable the integrated assembler 1439 1440.. option:: -fjump-tables, -fno-jump-tables 1441 1442.. option:: -flax-vector-conversions, -fno-lax-vector-conversions 1443 1444.. option:: -flimited-precision=<arg> 1445 1446.. option:: -flto, -fno-lto 1447 1448Enable LTO in 'full' mode 1449 1450.. option:: -flto-jobs=<arg> 1451 1452Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1453 1454.. program:: clang1 1455.. option:: -flto=<arg> 1456.. program:: clang 1457 1458Set LTO mode to either 'full' or 'thin' 1459 1460.. option:: -fmacro-backtrace-limit=<arg> 1461 1462.. option:: -fmath-errno, -fno-math-errno 1463 1464Require math functions to indicate errors by setting errno 1465 1466.. option:: -fmax-type-align=<arg> 1467 1468Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1469 1470.. option:: -fmerge-all-constants, -fno-merge-all-constants 1471 1472Allow merging of constants 1473 1474.. option:: -fmessage-length=<arg> 1475 1476.. option:: -fmodule-file-deps, -fno-module-file-deps 1477 1478.. option:: -fmodule-map-file=<file> 1479 1480Load this module map file 1481 1482.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1483 1484Specify the name of the module to build 1485 1486.. option:: -fmodules, -fno-modules 1487 1488Enable the 'modules' language feature 1489 1490.. option:: -fmodules-decluse, -fno-modules-decluse 1491 1492Require declaration of modules used within a module 1493 1494.. option:: -fmodules-ignore-macro=<arg> 1495 1496Ignore the definition of the given macro when building and loading modules 1497 1498.. option:: -fmodules-search-all, -fno-modules-search-all 1499 1500Search even non-imported modules to resolve references 1501 1502.. option:: -fmodules-strict-decluse 1503 1504Like -fmodules-decluse but requires all headers to be in modules 1505 1506.. option:: -fmodules-ts 1507 1508Enable support for the C++ Modules TS 1509 1510.. option:: -fms-compatibility, -fno-ms-compatibility 1511 1512Enable full Microsoft Visual C++ compatibility 1513 1514.. option:: -fms-compatibility-version=<arg> 1515 1516Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1517 1518.. option:: -fms-extensions, -fno-ms-extensions 1519 1520Accept some non-standard constructs supported by the Microsoft compiler 1521 1522.. option:: -fms-memptr-rep=<arg> 1523 1524.. option:: -fms-volatile<arg> 1525 1526.. option:: -fmsc-version=<arg> 1527 1528Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1529 1530.. option:: -fmudflap 1531 1532.. option:: -fmudflapth 1533 1534.. option:: -fnested-functions 1535 1536.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1537 1538Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1539 1540.. option:: -fnext-runtime 1541 1542.. option:: -fno-builtin-<arg> 1543 1544Disable implicit builtin knowledge of a specific function 1545 1546.. option:: -fno-elide-type 1547 1548Do not elide types when printing diagnostics 1549 1550.. option:: -fno-max-type-align 1551 1552.. option:: -fno-operator-names 1553 1554Do not treat C++ operator name keywords as synonyms for operators 1555 1556.. option:: -fno-rtti-data 1557 1558Control emission of RTTI data 1559 1560.. option:: -fno-strict-modules-decluse 1561 1562.. option:: -fno-working-directory 1563 1564.. option:: -fnoxray-link-deps 1565 1566.. option:: -fobjc-abi-version=<arg> 1567 1568.. option:: -fobjc-arc, -fno-objc-arc 1569 1570Synthesize retain and release calls for Objective-C pointers 1571 1572.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1573 1574Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1575 1576.. option:: -fobjc-exceptions, -fno-objc-exceptions 1577 1578Enable Objective-C exceptions 1579 1580.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1581 1582.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1583 1584.. option:: -fobjc-link-runtime 1585 1586.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1587 1588.. option:: -fobjc-nonfragile-abi-version=<arg> 1589 1590.. option:: -fobjc-runtime=<arg> 1591 1592Specify the target Objective-C runtime kind and version 1593 1594.. option:: -fobjc-sender-dependent-dispatch 1595 1596.. option:: -fobjc-weak, -fno-objc-weak 1597 1598Enable ARC-style weak references in Objective-C 1599 1600.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1601 1602.. option:: -fopenmp, -fno-openmp 1603 1604Parse OpenMP pragmas and generate parallel code. 1605 1606.. option:: -fopenmp-simd, -fno-openmp-simd 1607 1608Emit OpenMP code only for SIMD-based constructs. 1609 1610.. option:: -fopenmp-version=<arg> 1611 1612.. program:: clang1 1613.. option:: -fopenmp=<arg> 1614.. program:: clang 1615 1616.. option:: -foperator-arrow-depth=<arg> 1617 1618.. option:: -foptimization-record-file=<arg> 1619 1620Specify the file name of any generated YAML optimization record 1621 1622.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1623 1624.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1625 1626.. option:: -fpack-struct, -fno-pack-struct 1627 1628.. program:: clang1 1629.. option:: -fpack-struct=<arg> 1630.. program:: clang 1631 1632Specify the default maximum struct packing alignment 1633 1634.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1635 1636Recognize and construct Pascal-style string literals 1637 1638.. option:: -fpcc-struct-return 1639 1640Override the default ABI to return all structs on the stack 1641 1642.. option:: -fpch-preprocess 1643 1644.. option:: -fpic, -fno-pic 1645 1646.. option:: -fpie, -fno-pie 1647 1648.. option:: -fplt, -fno-plt 1649 1650Use the PLT to make function calls 1651 1652.. option:: -fplugin=<dsopath> 1653 1654Load the named plugin (dynamic shared object) 1655 1656.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1657 1658.. option:: -fprofile-arcs, -fno-profile-arcs 1659 1660.. option:: -fprofile-dir=<arg> 1661 1662.. option:: -fprofile-generate, -fno-profile-generate 1663 1664Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1665 1666.. program:: clang1 1667.. option:: -fprofile-generate=<directory> 1668.. program:: clang 1669 1670Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1671 1672.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1673 1674Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1675 1676.. program:: clang1 1677.. option:: -fprofile-instr-generate=<file> 1678.. program:: clang 1679 1680Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1681 1682.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1683 1684.. program:: clang1 1685.. option:: -fprofile-instr-use=<arg> 1686.. program:: clang 1687 1688Use instrumentation data for profile-guided optimization 1689 1690.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1691 1692Specifies that the sample profile is accurate. If the sample 1693 profile is accurate, callsites without profile samples are marked 1694 as cold. Otherwise, treat callsites without profile samples as if 1695 we have no profile 1696 1697.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 1698 1699.. program:: clang1 1700.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 1701.. program:: clang 1702 1703Enable sample-based profile guided optimizations 1704 1705.. program:: clang1 1706.. option:: -fprofile-use=<pathname> 1707.. program:: clang 1708 1709Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 1710 1711.. option:: -freciprocal-math, -fno-reciprocal-math 1712 1713Allow division operations to be reassociated 1714 1715.. option:: -freg-struct-return 1716 1717Override the default ABI to return small structs in registers 1718 1719.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 1720 1721Use atexit or \_\_cxa\_atexit to register global destructors 1722 1723.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 1724 1725Enable C++17 relaxed template template argument matching 1726 1727.. option:: -freroll-loops, -fno-reroll-loops 1728 1729Turn on loop reroller 1730 1731.. option:: -fretain-comments-from-system-headers 1732 1733.. option:: -frewrite-imports, -fno-rewrite-imports 1734 1735.. option:: -frewrite-includes, -fno-rewrite-includes 1736 1737.. option:: -frewrite-map-file <arg> 1738 1739.. program:: clang1 1740.. option:: -frewrite-map-file=<arg> 1741.. program:: clang 1742 1743.. option:: -fropi, -fno-ropi 1744 1745.. option:: -frtti, -fno-rtti 1746 1747.. option:: -frwpi, -fno-rwpi 1748 1749.. option:: -fsave-optimization-record, -fno-save-optimization-record 1750 1751Generate a YAML optimization record file 1752 1753.. option:: -fseh-exceptions 1754 1755Use SEH style exceptions 1756 1757.. option:: -fshort-enums, -fno-short-enums 1758 1759Allocate to an enum type only as many bytes as it needs for the declared range of possible values 1760 1761.. option:: -fshort-wchar, -fno-short-wchar 1762 1763Force wchar\_t to be a short unsigned int 1764 1765.. option:: -fshow-column, -fno-show-column 1766 1767.. option:: -fshow-overloads=<arg> 1768 1769Which overload candidates to show when overload resolution fails: best\|all; defaults to all 1770 1771.. option:: -fshow-source-location, -fno-show-source-location 1772 1773.. option:: -fsignaling-math, -fno-signaling-math 1774 1775.. option:: -fsigned-bitfields 1776 1777.. option:: -fsigned-char, -fno-signed-char, --signed-char 1778 1779.. option:: -fsigned-zeros, -fno-signed-zeros 1780 1781.. option:: -fsized-deallocation, -fno-sized-deallocation 1782 1783Enable C++14 sized global deallocation functions 1784 1785.. option:: -fsjlj-exceptions 1786 1787Use SjLj style exceptions 1788 1789.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 1790 1791Enable the superword-level parallelism vectorization passes 1792 1793.. option:: -fspell-checking, -fno-spell-checking 1794 1795.. option:: -fspell-checking-limit=<arg> 1796 1797.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 1798 1799Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 1800 1801.. option:: -fsplit-stack 1802 1803.. option:: -fstack-protector, -fno-stack-protector 1804 1805Enable stack protectors for functions potentially vulnerable to stack smashing 1806 1807.. option:: -fstack-protector-all 1808 1809Force the usage of stack protectors for all functions 1810 1811.. option:: -fstack-protector-strong 1812 1813Use a strong heuristic to apply stack protectors to functions 1814 1815.. option:: -fstack-size-section, -fno-stack-size-section 1816 1817Emit section containing metadata on function stack sizes 1818 1819.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 1820 1821Emit full debug info for all types used by the program 1822 1823.. option:: -fstrict-aliasing, -fno-strict-aliasing 1824 1825.. option:: -fstrict-enums, -fno-strict-enums 1826 1827Enable optimizations based on the strict definition of an enum's value range 1828 1829.. option:: -fstrict-overflow, -fno-strict-overflow 1830 1831.. option:: -fstrict-return, -fno-strict-return 1832 1833Always treat control flow paths that fall off the end of a non-void function as unreachable 1834 1835.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 1836 1837Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 1838 1839.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 1840 1841.. option:: -ftabstop=<arg> 1842 1843.. option:: -ftemplate-backtrace-limit=<arg> 1844 1845.. option:: -ftemplate-depth-<arg> 1846 1847.. option:: -ftemplate-depth=<arg> 1848 1849.. option:: -ftest-coverage 1850 1851.. option:: -fthinlto-index=<arg> 1852 1853Perform ThinLTO importing using provided function summary index 1854 1855.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 1856 1857.. option:: -ftime-report 1858 1859.. option:: -ftls-model=<arg> 1860 1861.. option:: -ftrap-function=<arg> 1862 1863Issue call to specified function rather than a trap instruction 1864 1865.. option:: -ftrapping-math, -fno-trapping-math 1866 1867.. option:: -ftrapv 1868 1869Trap on integer overflow 1870 1871.. option:: -ftrapv-handler <arg> 1872 1873.. program:: clang1 1874.. option:: -ftrapv-handler=<function name> 1875.. program:: clang 1876 1877Specify the function to be called on overflow 1878 1879.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 1880 1881Process trigraph sequences 1882 1883.. option:: -funique-section-names, -fno-unique-section-names 1884 1885Use unique names for text and data sections (ELF Only) 1886 1887.. option:: -funit-at-a-time, -fno-unit-at-a-time 1888 1889.. option:: -funroll-loops, -fno-unroll-loops 1890 1891Turn on loop unroller 1892 1893.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 1894 1895.. option:: -funsigned-bitfields 1896 1897.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 1898 1899.. option:: -funwind-tables, -fno-unwind-tables 1900 1901.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 1902 1903.. option:: -fuse-init-array, -fno-use-init-array 1904 1905Use .init\_array instead of .ctors 1906 1907.. option:: -fuse-ld=<arg> 1908 1909.. option:: -fuse-line-directives, -fno-use-line-directives 1910 1911.. option:: -fveclib=<arg> 1912 1913Use the given vector functions library 1914 1915.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 1916 1917Enable the loop vectorization passes 1918 1919.. option:: -fverbose-asm, -fno-verbose-asm 1920 1921.. option:: -fvisibility-inlines-hidden 1922 1923Give inline C++ member functions default visibility by default 1924 1925.. option:: -fvisibility-ms-compat 1926 1927Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 1928 1929.. option:: -fvisibility=<arg> 1930 1931Set the default symbol visibility for all global declarations 1932 1933.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 1934 1935Enables whole-program vtable optimization. Requires -flto 1936 1937.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1938 1939In order to improve devirtualization, forces emitting of vtables even in 1940modules where it isn't necessary. It causes more inline virtual functions 1941to be emitted. 1942 1943.. option:: -fwrapv, -fno-wrapv 1944 1945Treat signed integer overflow as two's complement 1946 1947.. option:: -fwritable-strings 1948 1949Store string literals as writable data 1950 1951.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 1952 1953Determine whether to always emit \_\_xray\_customevent(...) calls even if the function it appears in is not always instrumented. 1954 1955.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 1956 1957Determine whether to always emit \_\_xray\_typedevent(...) calls even if the function it appears in is not always instrumented. 1958 1959.. option:: -fxray-always-instrument=<arg> 1960 1961DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 1962 1963.. option:: -fxray-attr-list=<arg> 1964 1965Filename defining the list of functions/types for imbuing XRay attributes. 1966 1967.. option:: -fxray-instruction-threshold<arg> 1968 1969.. program:: clang1 1970.. option:: -fxray-instruction-threshold=<arg> 1971.. program:: clang 1972 1973Sets the minimum function size to instrument with XRay 1974 1975.. option:: -fxray-instrument, -fno-xray-instrument 1976 1977Generate XRay instrumentation sleds on function entry and exit 1978 1979.. option:: -fxray-instrumentation-bundle=<arg> 1980 1981Select which XRay instrumentation points to emit. Options: all, none, function, custom. Default is 'all'. 1982 1983.. option:: -fxray-link-deps 1984 1985Tells clang to add the link dependencies for XRay. 1986 1987.. option:: -fxray-modes=<arg> 1988 1989List of modes to link in by default into XRay instrumented binaries. 1990 1991.. option:: -fxray-never-instrument=<arg> 1992 1993DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 1994 1995.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 1996 1997.. option:: -fzvector, -fno-zvector, -mzvector 1998 1999Enable System z vector language extension 2000 2001.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2002 2003.. option:: -pedantic-errors, --pedantic-errors 2004 2005OpenCL flags 2006------------ 2007.. option:: -cl-denorms-are-zero 2008 2009OpenCL only. Allow denormals to be flushed to zero. 2010 2011.. option:: -cl-fast-relaxed-math 2012 2013OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2014 2015.. option:: -cl-finite-math-only 2016 2017OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2018 2019.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2020 2021OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2022 2023.. option:: -cl-kernel-arg-info 2024 2025OpenCL only. Generate kernel argument metadata. 2026 2027.. option:: -cl-mad-enable 2028 2029OpenCL only. Allow use of less precise MAD computations in the generated binary. 2030 2031.. option:: -cl-no-signed-zeros 2032 2033OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2034 2035.. option:: -cl-opt-disable 2036 2037OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2038 2039.. option:: -cl-single-precision-constant 2040 2041OpenCL only. Treat double precision floating-point constant as single precision constant. 2042 2043.. option:: -cl-std=<arg> 2044 2045OpenCL language standard to compile for. 2046 2047.. option:: -cl-strict-aliasing 2048 2049OpenCL only. This option is added for compatibility with OpenCL 1.0. 2050 2051.. option:: -cl-uniform-work-group-size 2052 2053OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2054 2055.. option:: -cl-unsafe-math-optimizations 2056 2057OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2058 2059Target-dependent compilation options 2060~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2061.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg> 2062 2063Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2064 2065.. option:: -m16 2066 2067.. option:: -m32 2068 2069.. option:: -m64 2070 2071.. option:: -mabi=<arg> 2072 2073.. option:: -mabicalls, -mno-abicalls 2074 2075Enable SVR4-style position-independent code (Mips only) 2076 2077.. option:: -mabs=<arg> 2078 2079.. option:: -malign-double 2080 2081Align doubles to two words in structs (x86 only) 2082 2083.. option:: -march=<arg> 2084 2085.. option:: -masm=<arg> 2086 2087.. option:: -mbackchain, -mno-backchain 2088 2089Link stack frames through backchain on System Z 2090 2091.. option:: -mcheck-zero-division, -mno-check-zero-division 2092 2093.. option:: -mcmodel=<arg> 2094 2095.. option:: -mcompact-branches=<arg> 2096 2097.. option:: -mconsole<arg> 2098 2099.. option:: -mcpu=<arg>, -mv4 (equivalent to -mcpu=hexagonv4), -mv5 (equivalent to -mcpu=hexagonv5), -mv55 (equivalent to -mcpu=hexagonv55), -mv60 (equivalent to -mcpu=hexagonv60), -mv62 (equivalent to -mcpu=hexagonv62), -mv65 (equivalent to -mcpu=hexagonv65) 2100 2101.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2102 2103.. option:: -mdll<arg> 2104 2105.. option:: -mdouble-float 2106 2107.. option:: -mdsp, -mno-dsp 2108 2109.. option:: -mdspr2, -mno-dspr2 2110 2111.. option:: -mdynamic-no-pic<arg> 2112 2113.. option:: -meabi <arg> 2114 2115Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2116 2117.. option:: -membedded-data, -mno-embedded-data 2118 2119Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 2120 2121.. option:: -mextern-sdata, -mno-extern-sdata 2122 2123Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 2124 2125.. option:: -mfentry 2126 2127Insert calls to fentry at function entry (x86 only) 2128 2129.. option:: -mfloat-abi=<arg> 2130 2131.. option:: -mfp32 2132 2133Use 32-bit floating point registers (MIPS only) 2134 2135.. option:: -mfp64 2136 2137Use 64-bit floating point registers (MIPS only) 2138 2139.. option:: -mfpmath=<arg> 2140 2141.. option:: -mfpu=<arg> 2142 2143.. option:: -mglobal-merge, -mno-global-merge 2144 2145Enable merging of globals 2146 2147.. option:: -mgpopt, -mno-gpopt 2148 2149Use GP relative accesses for symbols known to be in a small data section (MIPS) 2150 2151.. option:: -mhard-float 2152 2153.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2154 2155.. option:: -miamcu, -mno-iamcu 2156 2157Use Intel MCU ABI 2158 2159.. option:: -mimplicit-float, -mno-implicit-float 2160 2161.. option:: -mimplicit-it=<arg> 2162 2163.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2164 2165(integrated-as) Emit an object file which can be used with an incremental linker 2166 2167.. option:: -mindirect-jump=<arg> 2168 2169Change indirect jump instructions to inhibit speculation 2170 2171.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2172 2173.. option:: -mips16 2174 2175.. option:: -mkernel 2176 2177.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 2178 2179.. option:: -mlocal-sdata, -mno-local-sdata 2180 2181Extend the -G behaviour to object local data (MIPS) 2182 2183.. option:: -mlong-calls, -mno-long-calls 2184 2185Generate branches with extended addressability, usually via indirect jumps. 2186 2187.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2188 2189Set Mac OS X deployment target 2190 2191.. option:: -mmadd4, -mno-madd4 2192 2193Enable the generation of 4-operand madd.s, madd.d and related instructions. 2194 2195.. option:: -mmcu=<arg> 2196 2197.. option:: -mmicromips, -mno-micromips 2198 2199.. option:: -mms-bitfields, -mno-ms-bitfields 2200 2201Set the default structure layout to be compatible with the Microsoft compiler standard 2202 2203.. option:: -mmsa, -mno-msa 2204 2205Enable MSA ASE (MIPS only) 2206 2207.. option:: -mmt, -mno-mt 2208 2209Enable MT ASE (MIPS only) 2210 2211.. option:: -mnan=<arg> 2212 2213.. option:: -mno-mips16 2214 2215.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2216 2217Omit frame pointer setup for leaf functions 2218 2219.. option:: -moslib=<arg> 2220 2221.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2222 2223Use copy relocations support for PIE builds 2224 2225.. option:: -mprefer-vector-width=<arg> 2226 2227Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2228 2229.. option:: -mqdsp6-compat 2230 2231Enable hexagon-qdsp6 backward compatibility 2232 2233.. option:: -mrecip 2234 2235.. program:: clang1 2236.. option:: -mrecip=<arg1>,<arg2>... 2237.. program:: clang 2238 2239.. option:: -mred-zone, -mno-red-zone 2240 2241.. option:: -mregparm=<arg> 2242 2243.. option:: -mrelax-all, -mno-relax-all 2244 2245(integrated-as) Relax all machine instructions 2246 2247.. option:: -mrtd, -mno-rtd 2248 2249Make StdCall calling convention the default 2250 2251.. option:: -msingle-float 2252 2253.. option:: -msoft-float, -mno-soft-float 2254 2255Use software floating point 2256 2257.. option:: -mstack-alignment=<arg> 2258 2259Set the stack alignment 2260 2261.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2262 2263Enable stack probes 2264 2265.. option:: -mstack-probe-size=<arg> 2266 2267Set the stack probe size 2268 2269.. option:: -mstackrealign, -mno-stackrealign 2270 2271Force realign the stack at entry to every function 2272 2273.. option:: -mthread-model <arg> 2274 2275The thread model to use, e.g. posix, single (posix by default) 2276 2277.. option:: -mthreads<arg> 2278 2279.. option:: -mthumb, -mno-thumb 2280 2281.. option:: -mtune=<arg> 2282 2283.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2284 2285.. option:: -municode<arg> 2286 2287.. option:: -mvx, -mno-vx 2288 2289.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2290 2291.. option:: -mwatchos-version-min=<arg> 2292 2293.. option:: -mwindows<arg> 2294 2295.. option:: -mx32 2296 2297.. option:: -mxgot, -mno-xgot 2298 2299AARCH64 2300------- 2301.. option:: -ffixed-x18 2302 2303Reserve the x18 register (AArch64 only) 2304 2305.. option:: -ffixed-x20 2306 2307Reserve the x20 register (AArch64 only) 2308 2309.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2310 2311Workaround Cortex-A53 erratum 835769 (AArch64 only) 2312 2313.. option:: -mgeneral-regs-only 2314 2315Generate code which only uses the general purpose registers (AArch64 only) 2316 2317AMDGPU 2318------ 2319.. option:: -mxnack, -mno-xnack 2320 2321Enable XNACK (AMDGPU only) 2322 2323ARM 2324--- 2325.. option:: -ffixed-r9 2326 2327Reserve the r9 register (ARM only) 2328 2329.. option:: -mcrc 2330 2331Allow use of CRC instructions (ARM only) 2332 2333.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2334 2335Disallow generation of data access to code sections (ARM only) 2336 2337.. option:: -mno-movt 2338 2339Disallow use of movt/movw pairs (ARM only) 2340 2341.. option:: -mno-neg-immediates 2342 2343Disallow converting instructions with negative immediates to their negation or inversion. 2344 2345.. option:: -mnocrc 2346 2347Disallow use of CRC instructions (ARM only) 2348 2349.. option:: -mrestrict-it, -mno-restrict-it 2350 2351Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2352 2353.. option:: -mtp=<arg> 2354 2355Read thread pointer from coprocessor register (ARM only) 2356 2357.. option:: -munaligned-access, -mno-unaligned-access 2358 2359Allow memory accesses to be unaligned (AArch32/AArch64 only) 2360 2361Hexagon 2362------- 2363.. option:: -mieee-rnd-near 2364 2365.. option:: -mpackets, -mno-packets 2366 2367Enable generation of instruction packets 2368 2369Hexagon 2370------- 2371.. option:: -mhvx, -mno-hvx 2372 2373Enable Hexagon Vector eXtensions 2374 2375.. option:: -mhvx-length=<arg> 2376 2377Set Hexagon Vector Length 2378 2379.. program:: clang1 2380.. option:: -mhvx=<arg> 2381.. program:: clang 2382 2383Enable Hexagon Vector eXtensions 2384 2385PowerPC 2386------- 2387.. option:: -maltivec, -mno-altivec 2388 2389.. option:: -mcmpb, -mno-cmpb 2390 2391.. option:: -mcrbits, -mno-crbits 2392 2393.. option:: -mcrypto, -mno-crypto 2394 2395.. option:: -mdirect-move, -mno-direct-move 2396 2397.. option:: -mfloat128, -mno-float128 2398 2399.. option:: -mfprnd, -mno-fprnd 2400 2401.. option:: -mhtm, -mno-htm 2402 2403.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 2404 2405.. option:: -misel, -mno-isel 2406 2407.. option:: -mlongcall, -mno-longcall 2408 2409.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 2410 2411.. option:: -mpopcntd, -mno-popcntd 2412 2413.. option:: -mpower8-vector, -mno-power8-vector 2414 2415.. option:: -mpower9-vector, -mno-power9-vector 2416 2417.. option:: -mqpx, -mno-qpx 2418 2419.. option:: -msecure-plt 2420 2421.. option:: -mvsx, -mno-vsx 2422 2423WebAssembly 2424----------- 2425.. option:: -mexception-handling, -mno-exception-handling 2426 2427.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 2428 2429.. option:: -msign-ext, -mno-sign-ext 2430 2431.. option:: -msimd128, -mno-simd128 2432 2433X86 2434--- 2435.. option:: -m3dnow, -mno-3dnow 2436 2437.. option:: -m3dnowa, -mno-3dnowa 2438 2439.. option:: -madx, -mno-adx 2440 2441.. option:: -maes, -mno-aes 2442 2443.. option:: -mavx, -mno-avx 2444 2445.. option:: -mavx2, -mno-avx2 2446 2447.. option:: -mavx512bitalg, -mno-avx512bitalg 2448 2449.. option:: -mavx512bw, -mno-avx512bw 2450 2451.. option:: -mavx512cd, -mno-avx512cd 2452 2453.. option:: -mavx512dq, -mno-avx512dq 2454 2455.. option:: -mavx512er, -mno-avx512er 2456 2457.. option:: -mavx512f, -mno-avx512f 2458 2459.. option:: -mavx512ifma, -mno-avx512ifma 2460 2461.. option:: -mavx512pf, -mno-avx512pf 2462 2463.. option:: -mavx512vbmi, -mno-avx512vbmi 2464 2465.. option:: -mavx512vbmi2, -mno-avx512vbmi2 2466 2467.. option:: -mavx512vl, -mno-avx512vl 2468 2469.. option:: -mavx512vnni, -mno-avx512vnni 2470 2471.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 2472 2473.. option:: -mbmi, -mno-bmi 2474 2475.. option:: -mbmi2, -mno-bmi2 2476 2477.. option:: -mcldemote, -mno-cldemote 2478 2479.. option:: -mclflushopt, -mno-clflushopt 2480 2481.. option:: -mclwb, -mno-clwb 2482 2483.. option:: -mclzero, -mno-clzero 2484 2485.. option:: -mcx16, -mno-cx16 2486 2487.. option:: -mf16c, -mno-f16c 2488 2489.. option:: -mfma, -mno-fma 2490 2491.. option:: -mfma4, -mno-fma4 2492 2493.. option:: -mfsgsbase, -mno-fsgsbase 2494 2495.. option:: -mfxsr, -mno-fxsr 2496 2497.. option:: -mgfni, -mno-gfni 2498 2499.. option:: -mlwp, -mno-lwp 2500 2501.. option:: -mlzcnt, -mno-lzcnt 2502 2503.. option:: -mmmx, -mno-mmx 2504 2505.. option:: -mmovbe, -mno-movbe 2506 2507.. option:: -mmovdiri, -mno-movdiri 2508 2509.. option:: -mmovdir64b, -mno-movdir64b 2510 2511.. option:: -mmpx, -mno-mpx 2512 2513.. option:: -mmwaitx, -mno-mwaitx 2514 2515.. option:: -mpclmul, -mno-pclmul 2516 2517.. option:: -mpku, -mno-pku 2518 2519.. option:: -mpopcnt, -mno-popcnt 2520 2521.. option:: -mprefetchwt1, -mno-prefetchwt1 2522 2523.. option:: -mprfchw, -mno-prfchw 2524 2525.. option:: -mrdpid, -mno-rdpid 2526 2527.. option:: -mrdrnd, -mno-rdrnd 2528 2529.. option:: -mrdseed, -mno-rdseed 2530 2531.. option:: -mretpoline, -mno-retpoline 2532 2533.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 2534 2535.. option:: -mrtm, -mno-rtm 2536 2537.. option:: -msahf, -mno-sahf 2538 2539.. option:: -msgx, -mno-sgx 2540 2541.. option:: -msha, -mno-sha 2542 2543.. option:: -mshstk, -mno-shstk 2544 2545.. option:: -msse, -mno-sse 2546 2547.. option:: -msse2, -mno-sse2 2548 2549.. option:: -msse3, -mno-sse3 2550 2551.. option:: -msse4.1, -mno-sse4.1 2552 2553.. program:: clang1 2554.. option:: -msse4.2, -mno-sse4.2, -msse4 2555.. program:: clang 2556 2557.. option:: -msse4a, -mno-sse4a 2558 2559.. option:: -mssse3, -mno-ssse3 2560 2561.. option:: -mtbm, -mno-tbm 2562 2563.. option:: -mvaes, -mno-vaes 2564 2565.. option:: -mvpclmulqdq, -mno-vpclmulqdq 2566 2567.. option:: -mwaitpkg, -mno-waitpkg 2568 2569.. option:: -mwbnoinvd, -mno-wbnoinvd 2570 2571.. option:: -mx87, -m80387, -mno-x87 2572 2573.. option:: -mxop, -mno-xop 2574 2575.. option:: -mxsave, -mno-xsave 2576 2577.. option:: -mxsavec, -mno-xsavec 2578 2579.. option:: -mxsaveopt, -mno-xsaveopt 2580 2581.. option:: -mxsaves, -mno-xsaves 2582 2583Optimization level 2584~~~~~~~~~~~~~~~~~~ 2585 2586Flags controlling how much optimization should be performed. 2587 2588.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg> 2589 2590.. option:: -Ofast<arg> 2591 2592Debug information generation 2593~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2594 2595Flags controlling how much and what kind of debug information should be 2596generated. 2597 2598Kind and level of debug information 2599----------------------------------- 2600.. option:: -g, --debug, --debug=<arg> 2601 2602Generate source-level debug information 2603 2604.. option:: -gdwarf-2 2605 2606Generate source-level debug information with dwarf version 2 2607 2608.. option:: -gdwarf-3 2609 2610Generate source-level debug information with dwarf version 3 2611 2612.. option:: -gdwarf-4, -gdwarf 2613 2614Generate source-level debug information with dwarf version 4 2615 2616.. option:: -gdwarf-5 2617 2618Generate source-level debug information with dwarf version 5 2619 2620.. option:: -gfull 2621 2622.. option:: -gused 2623 2624Debug level 2625___________ 2626.. option:: -g0 2627 2628.. option:: -g2 2629 2630.. option:: -g3 2631 2632.. option:: -ggdb0 2633 2634.. option:: -ggdb1 2635 2636.. option:: -ggdb2 2637 2638.. option:: -ggdb3 2639 2640.. option:: -gline-tables-only, -g1, -gmlt 2641 2642Emit debug line number tables only 2643 2644.. option:: -gmodules 2645 2646Generate debug info with external references to clang modules or precompiled headers 2647 2648Debugger to tune debug information for 2649______________________________________ 2650.. option:: -ggdb 2651 2652.. option:: -glldb 2653 2654.. option:: -gsce 2655 2656Debug information flags 2657----------------------- 2658.. option:: -gcolumn-info, -gno-column-info 2659 2660.. option:: -gdwarf-aranges 2661 2662.. option:: -gembed-source, -gno-embed-source 2663 2664Embed source text in DWARF debug sections 2665 2666.. option:: -ggnu-pubnames 2667 2668.. option:: -grecord-gcc-switches, -gno-record-gcc-switches 2669 2670.. option:: -gsplit-dwarf 2671 2672.. option:: -gstrict-dwarf, -gno-strict-dwarf 2673 2674.. option:: -gz 2675 2676DWARF debug sections compression type 2677 2678.. program:: clang1 2679.. option:: -gz=<arg> 2680.. program:: clang 2681 2682DWARF debug sections compression type 2683 2684Static analyzer flags 2685===================== 2686 2687Flags controlling the behavior of the Clang Static Analyzer. 2688 2689.. option:: -Xanalyzer <arg> 2690 2691Pass <arg> to the static analyzer 2692 2693Fortran compilation flags 2694========================= 2695 2696Flags that will be passed onto the ``gfortran`` compiler when Clang is given 2697a Fortran input. 2698 2699.. option:: -A<arg>, --assert <arg>, --assert=<arg> 2700 2701.. option:: -A-<arg> 2702 2703.. option:: -J<arg> 2704 2705.. option:: -cpp 2706 2707.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 2708 2709.. option:: -falign-commons, -fno-align-commons 2710 2711.. option:: -fall-intrinsics, -fno-all-intrinsics 2712 2713.. option:: -fautomatic, -fno-automatic 2714 2715.. option:: -fbackslash, -fno-backslash 2716 2717.. option:: -fbacktrace, -fno-backtrace 2718 2719.. option:: -fblas-matmul-limit=<arg> 2720 2721.. option:: -fbounds-check, -fno-bounds-check 2722 2723.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 2724 2725.. option:: -fcheck=<arg> 2726 2727.. option:: -fcoarray=<arg> 2728 2729.. option:: -fconvert=<arg> 2730 2731.. option:: -fcray-pointer, -fno-cray-pointer 2732 2733.. option:: -fd-lines-as-code, -fno-d-lines-as-code 2734 2735.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 2736 2737.. option:: -fdefault-double-8, -fno-default-double-8 2738 2739.. option:: -fdefault-integer-8, -fno-default-integer-8 2740 2741.. option:: -fdefault-real-8, -fno-default-real-8 2742 2743.. option:: -fdollar-ok, -fno-dollar-ok 2744 2745.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 2746 2747.. option:: -fdump-fortran-original, -fno-dump-fortran-original 2748 2749.. option:: -fdump-parse-tree, -fno-dump-parse-tree 2750 2751.. option:: -fexternal-blas, -fno-external-blas 2752 2753.. option:: -ff2c, -fno-f2c 2754 2755.. option:: -ffixed-form, -fno-fixed-form 2756 2757.. option:: -ffixed-line-length-<arg> 2758 2759.. option:: -ffpe-trap=<arg> 2760 2761.. option:: -ffree-form, -fno-free-form 2762 2763.. option:: -ffree-line-length-<arg> 2764 2765.. option:: -ffrontend-optimize, -fno-frontend-optimize 2766 2767.. option:: -fimplicit-none, -fno-implicit-none 2768 2769.. option:: -finit-character=<arg> 2770 2771.. option:: -finit-integer=<arg> 2772 2773.. option:: -finit-local-zero, -fno-init-local-zero 2774 2775.. option:: -finit-logical=<arg> 2776 2777.. option:: -finit-real=<arg> 2778 2779.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 2780 2781.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 2782 2783.. option:: -fmax-array-constructor=<arg> 2784 2785.. option:: -fmax-errors=<arg> 2786 2787.. option:: -fmax-identifier-length, -fno-max-identifier-length 2788 2789.. option:: -fmax-stack-var-size=<arg> 2790 2791.. option:: -fmax-subrecord-length=<arg> 2792 2793.. option:: -fmodule-private, -fno-module-private 2794 2795.. option:: -fpack-derived, -fno-pack-derived 2796 2797.. option:: -fprotect-parens, -fno-protect-parens 2798 2799.. option:: -frange-check, -fno-range-check 2800 2801.. option:: -freal-4-real-10, -fno-real-4-real-10 2802 2803.. option:: -freal-4-real-16, -fno-real-4-real-16 2804 2805.. option:: -freal-4-real-8, -fno-real-4-real-8 2806 2807.. option:: -freal-8-real-10, -fno-real-8-real-10 2808 2809.. option:: -freal-8-real-16, -fno-real-8-real-16 2810 2811.. option:: -freal-8-real-4, -fno-real-8-real-4 2812 2813.. option:: -frealloc-lhs, -fno-realloc-lhs 2814 2815.. option:: -frecord-marker=<arg> 2816 2817.. option:: -frecursive, -fno-recursive 2818 2819.. option:: -frepack-arrays, -fno-repack-arrays 2820 2821.. option:: -fsecond-underscore, -fno-second-underscore 2822 2823.. option:: -fsign-zero, -fno-sign-zero 2824 2825.. option:: -fstack-arrays, -fno-stack-arrays 2826 2827.. option:: -funderscoring, -fno-underscoring 2828 2829.. option:: -fwhole-file, -fno-whole-file 2830 2831.. option:: -imultilib <arg> 2832 2833.. option:: -nocpp 2834 2835.. option:: -static-libgfortran 2836 2837Linker flags 2838============ 2839Flags that are passed on to the linker 2840 2841.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 2842 2843Add directory to library search path 2844 2845.. option:: -Mach 2846 2847.. option:: -T<script> 2848 2849Specify <script> as linker script 2850 2851.. option:: -Tbss<addr> 2852 2853Set starting address of BSS to <addr> 2854 2855.. option:: -Tdata<addr> 2856 2857Set starting address of DATA to <addr> 2858 2859.. option:: -Ttext<addr> 2860 2861Set starting address of TEXT to <addr> 2862 2863.. option:: -Wl,<arg>,<arg2>... 2864 2865Pass the comma separated arguments in <arg> to the linker 2866 2867.. option:: -X 2868 2869.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 2870 2871Pass <arg> to the linker 2872 2873.. program:: clang1 2874.. option:: -Z 2875.. program:: clang 2876 2877.. option:: -e<arg>, --entry 2878 2879.. option:: -filelist <arg> 2880 2881.. option:: -l<arg> 2882 2883.. option:: -r 2884 2885.. option:: -rpath <arg> 2886 2887.. option:: -s 2888 2889.. option:: -t 2890 2891.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 2892 2893.. option:: -undef 2894 2895undef all system defines 2896 2897.. option:: -undefined<arg>, --no-undefined 2898 2899.. option:: -z <arg> 2900 2901Pass -z <arg> to the linker 2902 2903