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:: -Qunused-arguments 40 41Don't emit warning for unused driver arguments 42 43.. option:: -Wa,<arg>,<arg2>... 44 45Pass the comma separated arguments in <arg> to the assembler 46 47.. option:: -Wlarge-by-value-copy=<arg> 48 49.. option:: -Xarch\_<arg1> <arg2> 50 51.. option:: -Xcuda-fatbinary <arg> 52 53Pass <arg> to fatbinary invocation 54 55.. option:: -Xcuda-ptxas <arg> 56 57Pass <arg> to the ptxas assembler 58 59.. option:: -Xopenmp-target <arg> 60 61Pass <arg> to the target offloading toolchain. 62 63.. program:: clang1 64.. option:: -Xopenmp-target=<arg> <arg2> 65.. program:: clang 66 67Pass <arg> to the specified target offloading toolchain. The triple that identifies the toolchain must be provided after the equals sign. 68 69.. option:: -Z<arg> 70 71.. option:: -a<arg>, --profile-blocks 72 73.. option:: -all\_load 74 75.. option:: -allowable\_client <arg> 76 77.. option:: --analyze 78 79Run the static analyzer 80 81.. option:: --analyze-auto 82 83.. option:: --analyzer-no-default-checks 84 85.. option:: --analyzer-output<arg> 86 87Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|text). 88 89.. option:: -ansi, --ansi 90 91.. option:: -arch <arg> 92 93.. program:: clang1 94.. option:: -arch\_errors\_fatal 95.. program:: clang 96 97.. program:: clang2 98.. option:: -arch\_only <arg> 99.. program:: clang 100 101.. option:: -arcmt-migrate-emit-errors 102 103Emit ARC errors even if the migrator can fix them 104 105.. option:: -arcmt-migrate-report-output <arg> 106 107Output path for the plist report 108 109.. option:: --autocomplete=<arg> 110 111.. option:: -bind\_at\_load 112 113.. option:: -bundle 114 115.. program:: clang1 116.. option:: -bundle\_loader <arg> 117.. program:: clang 118 119.. option:: -client\_name<arg> 120 121.. option:: -compatibility\_version<arg> 122 123.. option:: --config <arg> 124 125Specifies configuration file 126 127.. option:: --constant-cfstrings 128 129.. option:: -coverage, --coverage 130 131.. option:: --cuda-compile-host-device 132 133Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 134 135.. option:: --cuda-device-only 136 137Compile CUDA code for device only 138 139.. option:: --cuda-gpu-arch=<arg>, --no-cuda-gpu-arch=<arg> 140 141CUDA GPU architecture (e.g. sm\_35). May be specified more than once. 142 143.. option:: --cuda-host-only 144 145Compile CUDA code for host only. Has no effect on non-CUDA compilations. 146 147.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 148 149Enable device-side debug info generation. Disables ptxas optimizations. 150 151.. option:: -current\_version<arg> 152 153.. option:: -dead\_strip 154 155.. option:: -dependency-dot <arg> 156 157Filename to write DOT-formatted header dependencies to 158 159.. option:: -dependency-file <arg> 160 161Filename (or -) to write dependency output to 162 163.. option:: -dumpmachine 164 165.. option:: -dumpversion 166 167.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 168 169.. option:: -dylib\_file <arg> 170 171.. option:: -dylinker 172 173.. program:: clang1 174.. option:: -dylinker\_install\_name<arg> 175.. program:: clang 176 177.. option:: -dynamic 178 179.. option:: -dynamiclib 180 181.. option:: -emit-ast 182 183Emit Clang AST files for source inputs 184 185.. option:: -exported\_symbols\_list <arg> 186 187.. option:: -faligned-new=<arg> 188 189.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 190 191Use approximate transcendental functions 192 193.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero 194 195Flush denormal floating point values to zero in CUDA device mode. 196 197.. option:: -fheinous-gnu-extensions 198 199.. option:: -flat\_namespace 200 201.. option:: -fopenmp-targets=<arg1>,<arg2>... 202 203Specify comma-separated list of triples OpenMP offloading targets to be supported 204 205.. option:: -force\_cpusubtype\_ALL 206 207.. program:: clang1 208.. option:: -force\_flat\_namespace 209.. program:: clang 210 211.. program:: clang2 212.. option:: -force\_load <arg> 213.. program:: clang 214 215.. option:: -framework <arg> 216 217.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 218 219Add -rpath with architecture-specific resource directory to the linker flags 220 221.. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> 222 223Use the gcc toolchain at the given directory 224 225.. option:: -gcodeview 226 227Generate CodeView debug information 228 229.. option:: -headerpad\_max\_install\_names<arg> 230 231.. option:: -help, --help 232 233Display available options 234 235.. option:: --help-hidden 236 237.. option:: -image\_base <arg> 238 239.. option:: -index-header-map 240 241Make the next included directory (-I or -F) an indexer header map 242 243.. option:: -init <arg> 244 245.. option:: -install\_name <arg> 246 247.. option:: -keep\_private\_externs 248 249.. option:: -lazy\_framework <arg> 250 251.. program:: clang1 252.. option:: -lazy\_library <arg> 253.. program:: clang 254 255.. option:: -mbig-endian, -EB 256 257.. option:: --migrate 258 259Run the migrator 260 261.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 262 263.. option:: -mlinker-version=<arg> 264 265.. option:: -mlittle-endian, -EL 266 267.. option:: -mllvm <arg> 268 269Additional arguments to forward to LLVM's option processing 270 271.. option:: -module-dependency-dir <arg> 272 273Directory to dump module dependencies to 274 275.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 276 277.. option:: -multi\_module 278 279.. option:: -multiply\_defined <arg> 280 281.. program:: clang1 282.. option:: -multiply\_defined\_unused <arg> 283.. program:: clang 284 285.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 286 287.. option:: --no-cuda-version-check 288 289Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 290 291.. option:: -no-integrated-cpp, --no-integrated-cpp 292 293.. option:: -no\_dead\_strip\_inits\_and\_terms 294 295.. option:: -nobuiltininc 296 297Disable builtin #include directories 298 299.. option:: -nocudainc 300 301.. option:: -nocudalib 302 303.. option:: -nodefaultlibs 304 305.. option:: -nofixprebinding 306 307.. option:: -nolibc 308 309.. option:: -nomultidefs 310 311.. option:: -nopie, -no-pie 312 313.. option:: -noprebind 314 315.. option:: -noseglinkedit 316 317.. option:: -nostartfiles 318 319.. option:: -nostdinc, --no-standard-includes 320 321.. program:: clang1 322.. option:: -nostdinc++ 323.. program:: clang 324 325Disable standard #include directories for the C++ standard library 326 327.. option:: -nostdlib, --no-standard-libraries 328 329.. program:: clang1 330.. option:: -nostdlib++ 331.. program:: clang 332 333.. option:: -nostdlibinc 334 335.. option:: -o<file>, --output <arg>, --output=<arg> 336 337Write output to <file> 338 339.. option:: -objcmt-atomic-property 340 341Make migration to 'atomic' properties 342 343.. option:: -objcmt-migrate-all 344 345Enable migration to modern ObjC 346 347.. option:: -objcmt-migrate-annotation 348 349Enable migration to property and method annotations 350 351.. option:: -objcmt-migrate-designated-init 352 353Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 354 355.. option:: -objcmt-migrate-instancetype 356 357Enable migration to infer instancetype for method result type 358 359.. option:: -objcmt-migrate-literals 360 361Enable migration to modern ObjC literals 362 363.. option:: -objcmt-migrate-ns-macros 364 365Enable migration to NS\_ENUM/NS\_OPTIONS macros 366 367.. option:: -objcmt-migrate-property 368 369Enable migration to modern ObjC property 370 371.. option:: -objcmt-migrate-property-dot-syntax 372 373Enable migration of setter/getter messages to property-dot syntax 374 375.. option:: -objcmt-migrate-protocol-conformance 376 377Enable migration to add protocol conformance on classes 378 379.. option:: -objcmt-migrate-readonly-property 380 381Enable migration to modern ObjC readonly property 382 383.. option:: -objcmt-migrate-readwrite-property 384 385Enable migration to modern ObjC readwrite property 386 387.. option:: -objcmt-migrate-subscripting 388 389Enable migration to modern ObjC subscripting 390 391.. option:: -objcmt-ns-nonatomic-iosonly 392 393Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 394 395.. option:: -objcmt-returns-innerpointer-property 396 397Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 398 399.. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> 400 401Only modify files with a filename contained in the provided directory path 402 403.. option:: -object 404 405.. option:: -p, --profile 406 407.. option:: -pagezero\_size<arg> 408 409.. option:: -pg 410 411Enable mcount instrumentation 412 413.. option:: -pie 414 415.. option:: -pipe, --pipe 416 417Use pipes between commands, when possible 418 419.. option:: -prebind 420 421.. program:: clang1 422.. option:: -prebind\_all\_twolevel\_modules 423.. program:: clang 424 425.. option:: -preload 426 427.. option:: --print-diagnostic-categories 428 429.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 430 431Print the full library path of <file> 432 433.. option:: -print-ivar-layout 434 435Enable Objective-C Ivar layout bitmap print trace 436 437.. option:: -print-libgcc-file-name, --print-libgcc-file-name 438 439Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 440 441.. option:: -print-multi-directory, --print-multi-directory 442 443.. option:: -print-multi-lib, --print-multi-lib 444 445.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 446 447Print the full program path of <name> 448 449.. option:: -print-resource-dir, --print-resource-dir 450 451Print the resource directory pathname 452 453.. option:: -print-search-dirs, --print-search-dirs 454 455Print the paths used for finding libraries and programs 456 457.. option:: -private\_bundle 458 459.. option:: -pthread, -no-pthread 460 461Support POSIX threads in generated code 462 463.. option:: -pthreads 464 465.. option:: -rdynamic 466 467.. option:: -read\_only\_relocs <arg> 468 469.. option:: -relocatable-pch, --relocatable-pch 470 471Whether to build a relocatable precompiled header 472 473.. option:: -remap 474 475.. option:: -rewrite-legacy-objc 476 477Rewrite Legacy Objective-C source to C++ 478 479.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 480 481Compiler runtime library to use 482 483.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 484 485Save llvm statistics. 486 487.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 488 489Save intermediate compilation results. 490 491.. option:: -sectalign <arg1> <arg2> <arg3> 492 493.. option:: -sectcreate <arg1> <arg2> <arg3> 494 495.. option:: -sectobjectsymbols <arg1> <arg2> 496 497.. option:: -sectorder <arg1> <arg2> <arg3> 498 499.. option:: -seg1addr<arg> 500 501.. option:: -seg\_addr\_table <arg> 502 503.. program:: clang1 504.. option:: -seg\_addr\_table\_filename <arg> 505.. program:: clang 506 507.. option:: -segaddr <arg1> <arg2> 508 509.. option:: -segcreate <arg1> <arg2> <arg3> 510 511.. option:: -seglinkedit 512 513.. option:: -segprot <arg1> <arg2> <arg3> 514 515.. option:: -segs\_read\_<arg> 516 517.. program:: clang1 518.. option:: -segs\_read\_only\_addr <arg> 519.. program:: clang 520 521.. program:: clang2 522.. option:: -segs\_read\_write\_addr <arg> 523.. program:: clang 524 525.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 526 527Serialize compiler diagnostics to a file 528 529.. option:: -shared, --shared 530 531.. option:: -shared-libgcc 532 533.. option:: -shared-libsan, -shared-libasan 534 535.. option:: -single\_module 536 537.. option:: -specs=<arg>, --specs=<arg> 538 539.. option:: -static, --static 540 541.. option:: -static-libgcc 542 543.. option:: -static-libsan 544 545.. option:: -static-libstdc++ 546 547.. option:: -std-default=<arg> 548 549.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 550 551C++ standard library to use 552 553.. option:: -sub\_library<arg> 554 555.. program:: clang1 556.. option:: -sub\_umbrella<arg> 557.. program:: clang 558 559.. option:: --sysroot=<arg>, --sysroot <arg> 560 561.. option:: --target-help 562 563.. option:: --target=<arg>, -target <arg> 564 565Generate code for the given target 566 567.. option:: -time 568 569Time individual commands 570 571.. option:: -traditional, --traditional 572 573.. option:: -traditional-cpp, --traditional-cpp 574 575Enable some traditional CPP emulation 576 577.. option:: -twolevel\_namespace 578 579.. program:: clang1 580.. option:: -twolevel\_namespace\_hints 581.. program:: clang 582 583.. option:: -umbrella <arg> 584 585.. option:: -unexported\_symbols\_list <arg> 586 587.. option:: -v, --verbose 588 589Show commands to run and use verbose output 590 591.. option:: --verify-debug-info 592 593Verify the binary representation of debug output 594 595.. option:: --version 596 597Print version information 598 599.. option:: -w, --no-warnings 600 601Suppress all warnings 602 603.. option:: -weak-l<arg> 604 605.. option:: -weak\_framework <arg> 606 607.. program:: clang1 608.. option:: -weak\_library <arg> 609.. program:: clang 610 611.. program:: clang2 612.. option:: -weak\_reference\_mismatches <arg> 613.. program:: clang 614 615.. option:: -whatsloaded 616 617.. option:: -whyload 618 619.. option:: -working-directory<arg>, -working-directory=<arg> 620 621Resolve file paths relative to the specified directory 622 623.. option:: -x<language>, --language <arg>, --language=<arg> 624 625Treat subsequent input files as having type <language> 626 627.. option:: -y<arg> 628 629Actions 630======= 631The action to perform on the input. 632 633.. option:: -E, --preprocess 634 635Only run the preprocessor 636 637.. option:: -S, --assemble 638 639Only run preprocess and compilation steps 640 641.. option:: -c, --compile 642 643Only run preprocess, compile, and assemble steps 644 645.. option:: -emit-llvm 646 647Use the LLVM representation for assembler and object files 648 649.. option:: -fsyntax-only 650 651.. option:: -module-file-info 652 653Provide information about a particular module file 654 655.. option:: --precompile 656 657Only precompile the input 658 659.. option:: -rewrite-objc 660 661Rewrite Objective-C source to C++ 662 663.. option:: -verify-pch 664 665Load and verify that a pre-compiled header file is not stale 666 667Compilation flags 668================= 669 670Flags controlling the behavior of Clang during compilation. These flags have 671no effect during actions that do not perform compilation. 672 673.. option:: -Xassembler <arg> 674 675Pass <arg> to the assembler 676 677.. option:: -Xclang <arg> 678 679Pass <arg> to the clang compiler 680 681.. option:: -fclang-abi-compat=<version> 682 683Attempt to match the ABI of Clang <version> 684 685.. option:: -fcomment-block-commands=<arg>,<arg2>... 686 687Treat each comma separated argument in <arg> as a documentation comment block command 688 689.. option:: -fdeclspec, -fno-declspec 690 691Allow \_\_declspec as a keyword 692 693.. option:: -fdepfile-entry=<arg> 694 695.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 696 697.. option:: -fdiagnostics-format=<arg> 698 699.. option:: -fdiagnostics-parseable-fixits 700 701Print fix-its in machine parseable form 702 703.. option:: -fdiagnostics-print-source-range-info 704 705Print source range spans in numeric form 706 707.. option:: -fdiagnostics-show-category=<arg> 708 709.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 710 711Enables an experimental new pass manager in LLVM. 712 713.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 714 715Use separate accesses for bitfields with legal widths and alignments. 716 717.. option:: -finline-functions, -fno-inline-functions 718 719Inline suitable functions 720 721.. option:: -finline-hint-functions 722 723Inline functions which are (explicitly or implicitly) marked inline 724 725.. option:: -fno-crash-diagnostics 726 727Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 728 729.. option:: -fno-sanitize-blacklist 730 731Don't use blacklist file for sanitizers 732 733.. option:: -fparse-all-comments 734 735.. option:: -fsanitize-address-field-padding=<arg> 736 737Level of field padding for AddressSanitizer 738 739.. option:: -fsanitize-address-globals-dead-stripping 740 741Enable linker dead stripping of globals in AddressSanitizer 742 743.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 744 745Enable use-after-scope detection in AddressSanitizer 746 747.. option:: -fsanitize-blacklist=<arg> 748 749Path to blacklist file for sanitizers 750 751.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 752 753Enable control flow integrity (CFI) checks for cross-DSO calls. 754 755.. option:: -fsanitize-cfi-icall-generalize-pointers 756 757Generalize pointers in CFI indirect call type signature checks 758 759.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 760 761Specify the type of coverage instrumentation for Sanitizers 762 763.. option:: -fsanitize-link-c++-runtime 764 765.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 766 767Enable origins tracking in MemorySanitizer 768 769.. program:: clang1 770.. option:: -fsanitize-memory-track-origins=<arg> 771.. program:: clang 772 773Enable origins tracking in MemorySanitizer 774 775.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 776 777Enable use-after-destroy detection in MemorySanitizer 778 779.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 780 781.. option:: -fsanitize-recover, -fno-sanitize-recover 782 783.. program:: clang1 784.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>... 785.. program:: clang 786 787Enable recovery for specified sanitizers 788 789.. option:: -fsanitize-stats, -fno-sanitize-stats 790 791Enable sanitizer statistics gathering. 792 793.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 794 795Enable atomic operations instrumentation in ThreadSanitizer (default) 796 797.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 798 799Enable function entry/exit instrumentation in ThreadSanitizer (default) 800 801.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 802 803Enable memory access instrumentation in ThreadSanitizer (default) 804 805.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>... 806 807Enable trapping for specified sanitizers 808 809.. option:: -fsanitize-undefined-strip-path-components=<number> 810 811Strip (or keep only, if negative) a given number of path components when emitting check metadata. 812 813.. option:: -fsanitize-undefined-trap-on-error, -fno-sanitize-undefined-trap-on-error 814 815.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 816 817Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 818 819.. option:: --param <arg>, --param=<arg> 820 821.. option:: -std=<arg>, --std=<arg>, --std <arg> 822 823Language standard to compile for 824 825Preprocessor flags 826~~~~~~~~~~~~~~~~~~ 827 828Flags controlling the behavior of the Clang preprocessor. 829 830.. option:: -C, --comments 831 832Include comments in preprocessed output 833 834.. option:: -CC, --comments-in-macros 835 836Include comments from within macros in preprocessed output 837 838.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 839 840Define <macro> to <value> (or 1 if <value> omitted) 841 842.. option:: -H, --trace-includes 843 844Show header includes and nesting depth 845 846.. option:: -P, --no-line-commands 847 848Disable linemarker output in -E mode 849 850.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 851 852Undefine macro <macro> 853 854.. option:: -Wp,<arg>,<arg2>... 855 856Pass the comma separated arguments in <arg> to the preprocessor 857 858.. option:: -Xpreprocessor <arg> 859 860Pass <arg> to the preprocessor 861 862Include path management 863----------------------- 864 865Flags controlling how ``#include``\s are resolved to files. 866 867.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 868 869Add directory to include search path 870 871.. option:: -I-, --include-barrier 872 873Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 874 875.. option:: --cuda-path=<arg> 876 877CUDA installation path 878 879.. option:: -cxx-isystem<directory> 880 881Add directory to the C++ SYSTEM include search path 882 883.. option:: -fbuild-session-file=<file> 884 885Use the last modification time of <file> as the build session timestamp 886 887.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 888 889Time when the current build session started 890 891.. option:: -fmodule-file=\[<name>=\]<file> 892 893Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 894 895.. option:: -fmodules-cache-path=<directory> 896 897Specify the module cache path 898 899.. option:: -fmodules-disable-diagnostic-validation 900 901Disable validation of the diagnostic options when loading the module 902 903.. option:: -fmodules-prune-after=<seconds> 904 905Specify the interval (in seconds) after which a module file will be considered unused 906 907.. option:: -fmodules-prune-interval=<seconds> 908 909Specify the interval (in seconds) between attempts to prune the module cache 910 911.. option:: -fmodules-user-build-path <directory> 912 913Specify the module user build path 914 915.. option:: -fmodules-validate-once-per-build-session 916 917Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 918 919.. option:: -fmodules-validate-system-headers 920 921Validate the system headers that a module depends on when loading the module 922 923.. option:: -fprebuilt-module-path=<directory> 924 925Specify the prebuilt module path 926 927.. option:: -i<arg> 928 929.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 930 931Add directory to AFTER include search path 932 933.. option:: -iframework<arg> 934 935Add directory to SYSTEM framework search path 936 937.. option:: -iframeworkwithsysroot<directory> 938 939Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 940 941.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 942 943Include macros from file before parsing 944 945.. option:: -include<file>, --include<file>, --include=<arg> 946 947Include file before parsing 948 949.. option:: -include-pch <file> 950 951Include precompiled header file 952 953.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 954 955Set the -iwithprefix/-iwithprefixbefore prefix 956 957.. option:: -iquote<directory> 958 959Add directory to QUOTE include search path 960 961.. option:: -isysroot<dir> 962 963Set the system root directory (usually /) 964 965.. option:: -isystem<directory> 966 967Add directory to SYSTEM include search path 968 969.. option:: -isystem-after<directory> 970 971Add directory to end of the SYSTEM include search path 972 973.. option:: -ivfsoverlay<arg> 974 975Overlay the virtual filesystem described by file over the real file system 976 977.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 978 979Set directory to SYSTEM include search path with prefix 980 981.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 982 983Set directory to include search path with prefix 984 985.. option:: -iwithsysroot<directory> 986 987Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 988 989.. option:: --ptxas-path=<arg> 990 991Path to ptxas (used for compiling CUDA code) 992 993.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 994 995Treat all #include paths starting with <prefix> as including a system header. 996 997Dependency file generation 998-------------------------- 999 1000Flags controlling generation of a dependency file for ``make``-like build 1001systems. 1002 1003.. option:: -M, --dependencies 1004 1005Like -MD, but also implies -E and writes to stdout by default 1006 1007.. option:: -MD, --write-dependencies 1008 1009Write a depfile containing user and system headers 1010 1011.. option:: -MF<file> 1012 1013Write depfile output from -MMD, -MD, -MM, or -M to <file> 1014 1015.. option:: -MG, --print-missing-file-dependencies 1016 1017Add missing headers to depfile 1018 1019.. option:: -MJ<arg> 1020 1021Write a compilation database entry per input 1022 1023.. option:: -MM, --user-dependencies 1024 1025Like -MMD, but also implies -E and writes to stdout by default 1026 1027.. option:: -MMD, --write-user-dependencies 1028 1029Write a depfile containing user headers 1030 1031.. option:: -MP 1032 1033Create phony target for each dependency (other than main file) 1034 1035.. option:: -MQ<arg> 1036 1037Specify name of main file output to quote in depfile 1038 1039.. option:: -MT<arg> 1040 1041Specify name of main file output in depfile 1042 1043.. option:: -MV 1044 1045Use NMake/Jom format for the depfile 1046 1047Dumping preprocessor state 1048-------------------------- 1049 1050Flags allowing the state of the preprocessor to be dumped in various ways. 1051 1052.. option:: -d 1053 1054.. program:: clang1 1055.. option:: -d<arg> 1056.. program:: clang 1057 1058.. option:: -dA 1059 1060.. option:: -dD 1061 1062Print macro definitions in -E mode in addition to normal output 1063 1064.. option:: -dI 1065 1066Print include directives in -E mode in addition to normal output 1067 1068.. option:: -dM 1069 1070Print macro definitions in -E mode instead of normal output 1071 1072Diagnostic flags 1073~~~~~~~~~~~~~~~~ 1074 1075Flags controlling which warnings, errors, and remarks Clang will generate. 1076See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1077 1078.. option:: -R<remark> 1079 1080Enable the specified remark 1081 1082.. option:: -Rpass-analysis=<arg> 1083 1084Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1085 1086.. option:: -Rpass-missed=<arg> 1087 1088Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1089 1090.. option:: -Rpass=<arg> 1091 1092Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1093 1094.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1095 1096Enable the specified warning 1097 1098.. option:: -Wdeprecated, -Wno-deprecated 1099 1100Enable warnings for deprecated constructs and define \_\_DEPRECATED 1101 1102.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1103 1104Target-independent compilation options 1105~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1106.. option:: -Wframe-larger-than=<arg> 1107 1108.. option:: -fPIC, -fno-PIC 1109 1110.. option:: -fPIE, -fno-PIE 1111 1112.. option:: -faccess-control, -fno-access-control 1113 1114.. program:: clang1 1115.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1116.. program:: clang 1117 1118Enable C++17 aligned allocation functions 1119 1120.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1121 1122Treat editor placeholders as valid source code 1123 1124.. option:: -fallow-unsupported 1125 1126.. option:: -faltivec, -fno-altivec 1127 1128.. option:: -fansi-escape-codes 1129 1130Use ANSI escape codes for diagnostics 1131 1132.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1133 1134Use Apple's kernel extensions ABI 1135 1136.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1137 1138Enable Apple gcc-compatible #pragma pack handling 1139 1140.. option:: -fapplication-extension, -fno-application-extension 1141 1142Restrict code to those available for App Extensions 1143 1144.. option:: -fasm, -fno-asm 1145 1146.. option:: -fasm-blocks, -fno-asm-blocks 1147 1148.. option:: -fassociative-math, -fno-associative-math 1149 1150.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1151 1152.. option:: -fast 1153 1154.. option:: -fastcp 1155 1156.. option:: -fastf 1157 1158.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1159 1160.. option:: -fautolink, -fno-autolink 1161 1162.. option:: -fblocks, -fno-blocks 1163 1164Enable the 'blocks' language feature 1165 1166.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1167 1168.. option:: -fborland-extensions, -fno-borland-extensions 1169 1170Accept non-standard constructs supported by the Borland compiler 1171 1172.. option:: -fbracket-depth=<arg> 1173 1174.. option:: -fbuiltin, -fno-builtin 1175 1176.. option:: -fbuiltin-module-map 1177 1178Load the clang builtins module map file. 1179 1180.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1181 1182.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1183 1184.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1185 1186Use colors in diagnostics 1187 1188.. option:: -fcommon, -fno-common 1189 1190.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1191 1192.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1193 1194.. option:: -fconstant-string-class=<arg> 1195 1196.. option:: -fconstexpr-backtrace-limit=<arg> 1197 1198.. option:: -fconstexpr-depth=<arg> 1199 1200.. option:: -fconstexpr-steps=<arg> 1201 1202.. option:: -fcoroutines-ts, -fno-coroutines-ts 1203 1204Enable support for the C++ Coroutines TS 1205 1206.. option:: -fcoverage-mapping, -fno-coverage-mapping 1207 1208Generate coverage mapping to enable code coverage analysis 1209 1210.. option:: -fcreate-profile 1211 1212.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1213 1214Enable C++ exceptions 1215 1216.. option:: -fcxx-modules, -fno-cxx-modules 1217 1218.. option:: -fdata-sections, -fno-data-sections 1219 1220Place each data in its own section (ELF Only) 1221 1222.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1223 1224Emit extra debug info to make sample profile more accurate. 1225 1226.. option:: -fdebug-macro, -fno-debug-macro 1227 1228Emit macro debug information 1229 1230.. option:: -fdebug-pass-arguments 1231 1232.. option:: -fdebug-pass-structure 1233 1234.. option:: -fdebug-prefix-map=<arg> 1235 1236remap file source paths in debug info 1237 1238.. option:: -fdebug-types-section, -fno-debug-types-section 1239 1240Place debug types in their own section (ELF Only) 1241 1242.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1243 1244Parse templated function definitions at the end of the translation unit 1245 1246.. option:: -fdenormal-fp-math=<arg> 1247 1248.. option:: -fdiagnostics-absolute-paths 1249 1250Print absolute paths in diagnostics 1251 1252.. option:: -fdiagnostics-color, -fno-diagnostics-color 1253 1254.. program:: clang1 1255.. option:: -fdiagnostics-color=<arg> 1256.. program:: clang 1257 1258.. option:: -fdiagnostics-hotness-threshold=<number> 1259 1260Prevent optimization remarks from being output if they do not have at least this profile count 1261 1262.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1263 1264Enable profile hotness information in diagnostic line 1265 1266.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1267 1268Display include stacks for diagnostic notes 1269 1270.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1271 1272Print option name with mappable diagnostics 1273 1274.. option:: -fdiagnostics-show-template-tree 1275 1276Print a template comparison tree for differing templates 1277 1278.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1279 1280Allow '$' in identifiers 1281 1282.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1283 1284Enable '\[\[\]\]' attributes in all C and C++ language modes 1285 1286.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1287 1288.. option:: -fdwarf-exceptions 1289 1290Use DWARF style exceptions 1291 1292.. option:: -felide-constructors, -fno-elide-constructors 1293 1294.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1295 1296.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1297 1298Embed LLVM bitcode (option: off, all, bitcode, marker) 1299 1300.. option:: -femit-all-decls 1301 1302Emit all declarations, even if unused 1303 1304.. option:: -femulated-tls, -fno-emulated-tls 1305 1306Use emutls functions to access thread\_local variables 1307 1308.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1309 1310.. option:: -ferror-limit=<arg> 1311 1312.. option:: -fexceptions, -fno-exceptions 1313 1314Enable support for exception handling 1315 1316.. option:: -fexec-charset=<arg> 1317 1318.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1319 1320.. option:: -ffast-math, -fno-fast-math 1321 1322Allow aggressive, lossy floating-point optimizations 1323 1324.. option:: -ffinite-math-only, -fno-finite-math-only 1325 1326.. option:: -ffor-scope, -fno-for-scope 1327 1328.. option:: -ffp-contract=<arg> 1329 1330Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma, default) \| off (never fuse) 1331 1332.. option:: -ffreestanding 1333 1334Assert that the compilation takes place in a freestanding environment 1335 1336.. option:: -ffunction-sections, -fno-function-sections 1337 1338Place each function in its own section (ELF Only) 1339 1340.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1341 1342.. option:: -fgnu-keywords, -fno-gnu-keywords 1343 1344Allow GNU-extension keywords regardless of language standard 1345 1346.. option:: -fgnu-runtime 1347 1348Generate output compatible with the standard GNU Objective-C runtime 1349 1350.. option:: -fgnu89-inline, -fno-gnu89-inline 1351 1352Use the gnu89 inline semantics 1353 1354.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1355 1356.. option:: -fhonor-nans, -fno-honor-nans 1357 1358.. option:: -fhosted 1359 1360.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1361 1362Implicitly search the file system for module map files. 1363 1364.. option:: -fimplicit-modules, -fno-implicit-modules 1365 1366.. option:: -finput-charset=<arg> 1367 1368.. option:: -finstrument-function-entry-bare 1369 1370Instrument function entry only, after inlining, without arguments to the instrumentation call 1371 1372.. option:: -finstrument-functions 1373 1374Generate calls to instrument function entry and exit 1375 1376.. option:: -finstrument-functions-after-inlining 1377 1378Like -finstrument-functions, but insert the calls after inlining 1379 1380.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1381 1382Enable the integrated assembler 1383 1384.. option:: -fjump-tables, -fno-jump-tables 1385 1386.. option:: -flax-vector-conversions, -fno-lax-vector-conversions 1387 1388.. option:: -flimited-precision=<arg> 1389 1390.. option:: -flto, -fno-lto 1391 1392Enable LTO in 'full' mode 1393 1394.. option:: -flto-jobs=<arg> 1395 1396Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1397 1398.. program:: clang1 1399.. option:: -flto=<arg> 1400.. program:: clang 1401 1402Set LTO mode to either 'full' or 'thin' 1403 1404.. option:: -fmacro-backtrace-limit=<arg> 1405 1406.. option:: -fmath-errno, -fno-math-errno 1407 1408Require math functions to indicate errors by setting errno 1409 1410.. option:: -fmax-type-align=<arg> 1411 1412Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1413 1414.. option:: -fmerge-all-constants, -fno-merge-all-constants 1415 1416.. option:: -fmessage-length=<arg> 1417 1418.. option:: -fmodule-file-deps, -fno-module-file-deps 1419 1420.. option:: -fmodule-map-file=<file> 1421 1422Load this module map file 1423 1424.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1425 1426Specify the name of the module to build 1427 1428.. option:: -fmodules, -fno-modules 1429 1430Enable the 'modules' language feature 1431 1432.. option:: -fmodules-decluse, -fno-modules-decluse 1433 1434Require declaration of modules used within a module 1435 1436.. option:: -fmodules-ignore-macro=<arg> 1437 1438Ignore the definition of the given macro when building and loading modules 1439 1440.. option:: -fmodules-search-all, -fno-modules-search-all 1441 1442Search even non-imported modules to resolve references 1443 1444.. option:: -fmodules-strict-decluse 1445 1446Like -fmodules-decluse but requires all headers to be in modules 1447 1448.. option:: -fmodules-ts 1449 1450Enable support for the C++ Modules TS 1451 1452.. option:: -fms-compatibility, -fno-ms-compatibility 1453 1454Enable full Microsoft Visual C++ compatibility 1455 1456.. option:: -fms-compatibility-version=<arg> 1457 1458Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1459 1460.. option:: -fms-extensions, -fno-ms-extensions 1461 1462Accept some non-standard constructs supported by the Microsoft compiler 1463 1464.. option:: -fms-memptr-rep=<arg> 1465 1466.. option:: -fms-volatile<arg> 1467 1468.. option:: -fmsc-version=<arg> 1469 1470Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1471 1472.. option:: -fmudflap 1473 1474.. option:: -fmudflapth 1475 1476.. option:: -fnested-functions 1477 1478.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1479 1480Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1481 1482.. option:: -fnext-runtime 1483 1484.. option:: -fno-builtin-<arg> 1485 1486Disable implicit builtin knowledge of a specific function 1487 1488.. option:: -fno-elide-type 1489 1490Do not elide types when printing diagnostics 1491 1492.. option:: -fno-max-type-align 1493 1494.. option:: -fno-operator-names 1495 1496Do not treat C++ operator name keywords as synonyms for operators 1497 1498.. option:: -fno-strict-modules-decluse 1499 1500.. option:: -fno-working-directory 1501 1502.. option:: -fnoopenmp-relocatable-target 1503 1504Do not compile OpenMP target code as relocatable. 1505 1506.. option:: -fnoopenmp-use-tls 1507 1508.. option:: -fobjc-abi-version=<arg> 1509 1510.. option:: -fobjc-arc, -fno-objc-arc 1511 1512Synthesize retain and release calls for Objective-C pointers 1513 1514.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1515 1516Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1517 1518.. option:: -fobjc-exceptions, -fno-objc-exceptions 1519 1520Enable Objective-C exceptions 1521 1522.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1523 1524.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1525 1526.. option:: -fobjc-link-runtime 1527 1528.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1529 1530.. option:: -fobjc-nonfragile-abi-version=<arg> 1531 1532.. option:: -fobjc-runtime=<arg> 1533 1534Specify the target Objective-C runtime kind and version 1535 1536.. option:: -fobjc-sender-dependent-dispatch 1537 1538.. option:: -fobjc-weak, -fno-objc-weak 1539 1540Enable ARC-style weak references in Objective-C 1541 1542.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1543 1544.. option:: -fopenmp, -fno-openmp 1545 1546.. option:: -fopenmp-dump-offload-linker-script 1547 1548.. option:: -fopenmp-relocatable-target 1549 1550OpenMP target code is compiled as relocatable using the -c flag. For OpenMP targets the code is relocatable by default. 1551 1552.. option:: -fopenmp-simd, -fno-openmp-simd 1553 1554Emit OpenMP code only for SIMD-based constructs. 1555 1556.. option:: -fopenmp-use-tls 1557 1558.. option:: -fopenmp-version=<arg> 1559 1560.. program:: clang1 1561.. option:: -fopenmp=<arg> 1562.. program:: clang 1563 1564.. option:: -foperator-arrow-depth=<arg> 1565 1566.. option:: -foptimization-record-file=<arg> 1567 1568Specify the file name of any generated YAML optimization record 1569 1570.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1571 1572.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1573 1574.. option:: -fpack-struct, -fno-pack-struct 1575 1576.. program:: clang1 1577.. option:: -fpack-struct=<arg> 1578.. program:: clang 1579 1580Specify the default maximum struct packing alignment 1581 1582.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1583 1584Recognize and construct Pascal-style string literals 1585 1586.. option:: -fpcc-struct-return 1587 1588Override the default ABI to return all structs on the stack 1589 1590.. option:: -fpch-preprocess 1591 1592.. option:: -fpic, -fno-pic 1593 1594.. option:: -fpie, -fno-pie 1595 1596.. option:: -fplt, -fno-plt 1597 1598Use the PLT to make function calls 1599 1600.. option:: -fplugin=<dsopath> 1601 1602Load the named plugin (dynamic shared object) 1603 1604.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1605 1606.. option:: -fprofile-arcs, -fno-profile-arcs 1607 1608.. option:: -fprofile-dir=<arg> 1609 1610.. option:: -fprofile-generate, -fno-profile-generate 1611 1612Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1613 1614.. program:: clang1 1615.. option:: -fprofile-generate=<directory> 1616.. program:: clang 1617 1618Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1619 1620.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 1621 1622Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1623 1624.. program:: clang1 1625.. option:: -fprofile-instr-generate=<file> 1626.. program:: clang 1627 1628Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 1629 1630.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 1631 1632.. program:: clang1 1633.. option:: -fprofile-instr-use=<arg> 1634.. program:: clang 1635 1636Use instrumentation data for profile-guided optimization 1637 1638.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 1639 1640Specifies that the sample profile is accurate. If the sample 1641 profile is accurate, callsites without profile samples are marked 1642 as cold. Otherwise, treat callsites without profile samples as if 1643 we have no profile 1644 1645.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 1646 1647.. program:: clang1 1648.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 1649.. program:: clang 1650 1651Enable sample-based profile guided optimizations 1652 1653.. program:: clang1 1654.. option:: -fprofile-use=<pathname> 1655.. program:: clang 1656 1657Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 1658 1659.. option:: -freciprocal-math, -fno-reciprocal-math 1660 1661Allow division operations to be reassociated 1662 1663.. option:: -freg-struct-return 1664 1665Override the default ABI to return small structs in registers 1666 1667.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 1668 1669Enable C++17 relaxed template template argument matching 1670 1671.. option:: -freroll-loops, -fno-reroll-loops 1672 1673Turn on loop reroller 1674 1675.. option:: -fretain-comments-from-system-headers 1676 1677.. option:: -frewrite-imports, -fno-rewrite-imports 1678 1679.. option:: -frewrite-includes, -fno-rewrite-includes 1680 1681.. option:: -frewrite-map-file <arg> 1682 1683.. program:: clang1 1684.. option:: -frewrite-map-file=<arg> 1685.. program:: clang 1686 1687.. option:: -fropi, -fno-ropi 1688 1689.. option:: -frtti, -fno-rtti 1690 1691.. option:: -frwpi, -fno-rwpi 1692 1693.. option:: -fsave-optimization-record, -fno-save-optimization-record 1694 1695Generate a YAML optimization record file 1696 1697.. option:: -fseh-exceptions 1698 1699Use SEH style exceptions 1700 1701.. option:: -fshort-enums, -fno-short-enums 1702 1703Allocate to an enum type only as many bytes as it needs for the declared range of possible values 1704 1705.. option:: -fshort-wchar, -fno-short-wchar 1706 1707Force wchar\_t to be a short unsigned int 1708 1709.. option:: -fshow-column, -fno-show-column 1710 1711.. option:: -fshow-overloads=<arg> 1712 1713Which overload candidates to show when overload resolution fails: best\|all; defaults to all 1714 1715.. option:: -fshow-source-location, -fno-show-source-location 1716 1717.. option:: -fsignaling-math, -fno-signaling-math 1718 1719.. option:: -fsigned-bitfields 1720 1721.. option:: -fsigned-char, -fno-signed-char, --signed-char 1722 1723.. option:: -fsigned-zeros, -fno-signed-zeros 1724 1725.. option:: -fsized-deallocation, -fno-sized-deallocation 1726 1727Enable C++14 sized global deallocation functions 1728 1729.. option:: -fsjlj-exceptions 1730 1731Use SjLj style exceptions 1732 1733.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 1734 1735Enable the superword-level parallelism vectorization passes 1736 1737.. option:: -fspell-checking, -fno-spell-checking 1738 1739.. option:: -fspell-checking-limit=<arg> 1740 1741.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 1742 1743Place debug types in their own section (ELF Only) 1744 1745.. option:: -fsplit-stack 1746 1747.. option:: -fstack-protector, -fno-stack-protector 1748 1749Enable stack protectors for functions potentially vulnerable to stack smashing 1750 1751.. option:: -fstack-protector-all 1752 1753Force the usage of stack protectors for all functions 1754 1755.. option:: -fstack-protector-strong 1756 1757Use a strong heuristic to apply stack protectors to functions 1758 1759.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 1760 1761Emit full debug info for all types used by the program 1762 1763.. option:: -fstrict-aliasing, -fno-strict-aliasing 1764 1765.. option:: -fstrict-enums, -fno-strict-enums 1766 1767Enable optimizations based on the strict definition of an enum's value range 1768 1769.. option:: -fstrict-overflow, -fno-strict-overflow 1770 1771.. option:: -fstrict-return, -fno-strict-return 1772 1773Always treat control flow paths that fall off the end of a non-void function as unreachable 1774 1775.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 1776 1777Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 1778 1779.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 1780 1781.. option:: -ftabstop=<arg> 1782 1783.. option:: -ftemplate-backtrace-limit=<arg> 1784 1785.. option:: -ftemplate-depth-<arg> 1786 1787.. option:: -ftemplate-depth=<arg> 1788 1789.. option:: -ftest-coverage 1790 1791.. option:: -fthinlto-index=<arg> 1792 1793Perform ThinLTO importing using provided function summary index 1794 1795.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 1796 1797.. option:: -ftime-report 1798 1799.. option:: -ftls-model=<arg> 1800 1801.. option:: -ftrap-function=<arg> 1802 1803Issue call to specified function rather than a trap instruction 1804 1805.. option:: -ftrapping-math, -fno-trapping-math 1806 1807.. option:: -ftrapv 1808 1809Trap on integer overflow 1810 1811.. option:: -ftrapv-handler <arg> 1812 1813.. program:: clang1 1814.. option:: -ftrapv-handler=<function name> 1815.. program:: clang 1816 1817Specify the function to be called on overflow 1818 1819.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 1820 1821Process trigraph sequences 1822 1823.. option:: -funique-section-names, -fno-unique-section-names 1824 1825Use unique names for text and data sections (ELF Only) 1826 1827.. option:: -funit-at-a-time, -fno-unit-at-a-time 1828 1829.. option:: -funroll-loops, -fno-unroll-loops 1830 1831Turn on loop unroller 1832 1833.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 1834 1835.. option:: -funsigned-bitfields 1836 1837.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 1838 1839.. option:: -funwind-tables, -fno-unwind-tables 1840 1841.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 1842 1843.. option:: -fuse-init-array, -fno-use-init-array 1844 1845Use .init\_array instead of .ctors 1846 1847.. option:: -fuse-ld=<arg> 1848 1849.. option:: -fuse-line-directives, -fno-use-line-directives 1850 1851.. option:: -fveclib=<arg> 1852 1853Use the given vector functions library 1854 1855.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 1856 1857Enable the loop vectorization passes 1858 1859.. option:: -fverbose-asm, -fno-verbose-asm 1860 1861.. option:: -fvisibility-inlines-hidden 1862 1863Give inline C++ member functions default visibility by default 1864 1865.. option:: -fvisibility-ms-compat 1866 1867Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 1868 1869.. option:: -fvisibility=<arg> 1870 1871Set the default symbol visibility for all global declarations 1872 1873.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 1874 1875Enables whole-program vtable optimization. Requires -flto 1876 1877.. option:: -fwrapv, -fno-wrapv 1878 1879Treat signed integer overflow as two's complement 1880 1881.. option:: -fwritable-strings 1882 1883Store string literals as writable data 1884 1885.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 1886 1887Determine whether to always emit \_\_xray\_customevent(...) calls even if the function it appears in is not always instrumented. 1888 1889.. option:: -fxray-always-instrument=<arg> 1890 1891Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 1892 1893.. option:: -fxray-instruction-threshold<arg> 1894 1895.. program:: clang1 1896.. option:: -fxray-instruction-threshold=<arg> 1897.. program:: clang 1898 1899Sets the minimum function size to instrument with XRay 1900 1901.. option:: -fxray-instrument, -fno-xray-instrument 1902 1903Generate XRay instrumentation sleds on function entry and exit 1904 1905.. option:: -fxray-never-instrument=<arg> 1906 1907Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 1908 1909.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 1910 1911.. option:: -fzvector, -fno-zvector, -mzvector 1912 1913Enable System z vector language extension 1914 1915.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 1916 1917.. option:: -pedantic-errors, --pedantic-errors 1918 1919OpenCL flags 1920------------ 1921.. option:: -cl-denorms-are-zero 1922 1923OpenCL only. Allow denormals to be flushed to zero. 1924 1925.. option:: -cl-fast-relaxed-math 1926 1927OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 1928 1929.. option:: -cl-finite-math-only 1930 1931OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 1932 1933.. option:: -cl-fp32-correctly-rounded-divide-sqrt 1934 1935OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 1936 1937.. option:: -cl-kernel-arg-info 1938 1939OpenCL only. Generate kernel argument metadata. 1940 1941.. option:: -cl-mad-enable 1942 1943OpenCL only. Allow use of less precise MAD computations in the generated binary. 1944 1945.. option:: -cl-no-signed-zeros 1946 1947OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 1948 1949.. option:: -cl-opt-disable 1950 1951OpenCL only. This option disables all optimizations. By default optimizations are enabled. 1952 1953.. option:: -cl-single-precision-constant 1954 1955OpenCL only. Treat double precision floating-point constant as single precision constant. 1956 1957.. option:: -cl-std=<arg> 1958 1959OpenCL language standard to compile for. 1960 1961.. option:: -cl-strict-aliasing 1962 1963OpenCL only. This option is added for compatibility with OpenCL 1.0. 1964 1965.. option:: -cl-unsafe-math-optimizations 1966 1967OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 1968 1969Target-dependent compilation options 1970~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1971.. option:: -G<size>, -G=<arg>, -msmall-data-threshold=<arg> 1972 1973Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 1974 1975.. option:: -m16 1976 1977.. option:: -m32 1978 1979.. option:: -m64 1980 1981.. option:: -mabi=<arg> 1982 1983.. option:: -mabicalls, -mno-abicalls 1984 1985Enable SVR4-style position-independent code (Mips only) 1986 1987.. option:: -mabs=<arg> 1988 1989.. option:: -malign-double 1990 1991Align doubles to two words in structs (x86 only) 1992 1993.. option:: -march=<arg> 1994 1995.. option:: -masm=<arg> 1996 1997.. option:: -mbackchain, -mno-backchain 1998 1999Link stack frames through backchain on System Z 2000 2001.. option:: -mcheck-zero-division, -mno-check-zero-division 2002 2003.. option:: -mcmodel=<arg> 2004 2005.. option:: -mcompact-branches=<arg> 2006 2007.. option:: -mconsole<arg> 2008 2009.. 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) 2010 2011.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2012 2013.. option:: -mdll<arg> 2014 2015.. option:: -mdouble-float 2016 2017.. option:: -mdsp, -mno-dsp 2018 2019.. option:: -mdspr2, -mno-dspr2 2020 2021.. option:: -mdynamic-no-pic<arg> 2022 2023.. option:: -meabi <arg> 2024 2025Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2026 2027.. option:: -membedded-data, -mno-embedded-data 2028 2029Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 2030 2031.. option:: -mextern-sdata, -mno-extern-sdata 2032 2033Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 2034 2035.. option:: -mfentry 2036 2037Insert calls to fentry at function entry (x86 only) 2038 2039.. option:: -mfloat-abi=<arg> 2040 2041.. option:: -mfp32 2042 2043Use 32-bit floating point registers (MIPS only) 2044 2045.. option:: -mfp64 2046 2047Use 64-bit floating point registers (MIPS only) 2048 2049.. option:: -mfpmath=<arg> 2050 2051.. option:: -mfpu=<arg> 2052 2053.. option:: -mglobal-merge, -mno-global-merge 2054 2055Enable merging of globals 2056 2057.. option:: -mgpopt, -mno-gpopt 2058 2059Use GP relative accesses for symbols known to be in a small data section (MIPS) 2060 2061.. option:: -mhard-float 2062 2063.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2064 2065.. option:: -miamcu, -mno-iamcu 2066 2067Use Intel MCU ABI 2068 2069.. option:: -mimplicit-float, -mno-implicit-float 2070 2071.. option:: -mimplicit-it=<arg> 2072 2073.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2074 2075(integrated-as) Emit an object file which can be used with an incremental linker 2076 2077.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2078 2079.. option:: -mips16 2080 2081.. option:: -mkernel 2082 2083.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 2084 2085.. option:: -mlocal-sdata, -mno-local-sdata 2086 2087Extend the -G behaviour to object local data (MIPS) 2088 2089.. option:: -mlong-calls, -mno-long-calls 2090 2091Generate branches with extended addressability, usually via indirect jumps. 2092 2093.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2094 2095Set Mac OS X deployment target 2096 2097.. option:: -mmadd4, -mno-madd4 2098 2099Enable the generation of 4-operand madd.s, madd.d and related instructions. 2100 2101.. option:: -mmcu=<arg> 2102 2103.. option:: -mmicromips, -mno-micromips 2104 2105.. option:: -mms-bitfields, -mno-ms-bitfields 2106 2107Set the default structure layout to be compatible with the Microsoft compiler standard 2108 2109.. option:: -mmsa, -mno-msa 2110 2111Enable MSA ASE (MIPS only) 2112 2113.. option:: -mmt, -mno-mt 2114 2115Enable MT ASE (MIPS only) 2116 2117.. option:: -mnan=<arg> 2118 2119.. option:: -mno-mips16 2120 2121.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2122 2123Omit frame pointer setup for leaf functions 2124 2125.. option:: -moslib=<arg> 2126 2127.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2128 2129Use copy relocations support for PIE builds 2130 2131.. option:: -mprefer-vector-width=<arg> 2132 2133Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2134 2135.. option:: -mqdsp6-compat 2136 2137Enable hexagon-qdsp6 backward compatibility 2138 2139.. option:: -mrecip 2140 2141.. program:: clang1 2142.. option:: -mrecip=<arg1>,<arg2>... 2143.. program:: clang 2144 2145.. option:: -mred-zone, -mno-red-zone 2146 2147.. option:: -mregparm=<arg> 2148 2149.. option:: -mrelax-all, -mno-relax-all 2150 2151(integrated-as) Relax all machine instructions 2152 2153.. option:: -mrtd, -mno-rtd 2154 2155Make StdCall calling convention the default 2156 2157.. option:: -msingle-float 2158 2159.. option:: -msoft-float, -mno-soft-float 2160 2161Use software floating point 2162 2163.. option:: -mstack-alignment=<arg> 2164 2165Set the stack alignment 2166 2167.. option:: -mstack-probe-size=<arg> 2168 2169Set the stack probe size 2170 2171.. option:: -mstackrealign, -mno-stackrealign 2172 2173Force realign the stack at entry to every function 2174 2175.. option:: -mthread-model <arg> 2176 2177The thread model to use, e.g. posix, single (posix by default) 2178 2179.. option:: -mthreads<arg> 2180 2181.. option:: -mthumb, -mno-thumb 2182 2183.. option:: -mtune=<arg> 2184 2185.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2186 2187.. option:: -municode<arg> 2188 2189.. option:: -mvx, -mno-vx 2190 2191.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2192 2193.. option:: -mwatchos-version-min=<arg> 2194 2195.. option:: -mwindows<arg> 2196 2197.. option:: -mx32 2198 2199.. option:: -mxgot, -mno-xgot 2200 2201AARCH64 2202------- 2203.. option:: -ffixed-x18 2204 2205Reserve the x18 register (AArch64 only) 2206 2207.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2208 2209Workaround Cortex-A53 erratum 835769 (AArch64 only) 2210 2211.. option:: -mgeneral-regs-only 2212 2213Generate code which only uses the general purpose registers (AArch64 only) 2214 2215AMDGPU 2216------ 2217.. option:: -mxnack, -mno-xnack 2218 2219Enable XNACK (AMDGPU only) 2220 2221ARM 2222--- 2223.. option:: -ffixed-r9 2224 2225Reserve the r9 register (ARM only) 2226 2227.. option:: -mcrc 2228 2229Allow use of CRC instructions (ARM only) 2230 2231.. option:: -mexecute-only, -mno-execute-only, -mpure-code 2232 2233Disallow generation of data access to code sections (ARM only) 2234 2235.. option:: -mno-movt 2236 2237Disallow use of movt/movw pairs (ARM only) 2238 2239.. option:: -mno-neg-immediates 2240 2241Disallow converting instructions with negative immediates to their negation or inversion. 2242 2243.. option:: -mnocrc 2244 2245Disallow use of CRC instructions (ARM only) 2246 2247.. option:: -mrestrict-it, -mno-restrict-it 2248 2249Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 2250 2251.. option:: -mtp=<arg> 2252 2253Read thread pointer from coprocessor register (ARM only) 2254 2255.. option:: -munaligned-access, -mno-unaligned-access 2256 2257Allow memory accesses to be unaligned (AArch32/AArch64 only) 2258 2259Hexagon 2260------- 2261.. option:: -mieee-rnd-near 2262 2263Hexagon 2264------- 2265.. option:: -mhvx, -mno-hvx 2266 2267Enable Hexagon Vector eXtensions 2268 2269.. option:: -mhvx-double, -mno-hvx-double 2270 2271Enable Hexagon Double Vector eXtensions 2272 2273.. option:: -mhvx-length=<arg> 2274 2275Set Hexagon Vector Length 2276 2277.. program:: clang1 2278.. option:: -mhvx=<arg> 2279.. program:: clang 2280 2281Enable Hexagon Vector eXtensions 2282 2283PowerPC 2284------- 2285.. option:: -maltivec, -mno-altivec 2286 2287.. option:: -mcmpb, -mno-cmpb 2288 2289.. option:: -mcrbits, -mno-crbits 2290 2291.. option:: -mcrypto, -mno-crypto 2292 2293.. option:: -mdirect-move, -mno-direct-move 2294 2295.. option:: -mfloat128, -mno-float128 2296 2297.. option:: -mfprnd, -mno-fprnd 2298 2299.. option:: -mhtm, -mno-htm 2300 2301.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 2302 2303.. option:: -misel, -mno-isel 2304 2305.. option:: -mlongcall, -mno-longcall 2306 2307.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 2308 2309.. option:: -mpopcntd, -mno-popcntd 2310 2311.. option:: -mpower8-vector, -mno-power8-vector 2312 2313.. option:: -mpower9-vector, -mno-power9-vector 2314 2315.. option:: -mqpx, -mno-qpx 2316 2317.. option:: -mvsx, -mno-vsx 2318 2319WebAssembly 2320----------- 2321.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 2322 2323.. option:: -msimd128, -mno-simd128 2324 2325X86 2326--- 2327.. option:: -m3dnow, -mno-3dnow 2328 2329.. option:: -m3dnowa, -mno-3dnowa 2330 2331.. option:: -madx, -mno-adx 2332 2333.. option:: -maes, -mno-aes 2334 2335.. option:: -mavx, -mno-avx 2336 2337.. option:: -mavx2, -mno-avx2 2338 2339.. option:: -mavx512bitalg, -mno-avx512bitalg 2340 2341.. option:: -mavx512bw, -mno-avx512bw 2342 2343.. option:: -mavx512cd, -mno-avx512cd 2344 2345.. option:: -mavx512dq, -mno-avx512dq 2346 2347.. option:: -mavx512er, -mno-avx512er 2348 2349.. option:: -mavx512f, -mno-avx512f 2350 2351.. option:: -mavx512ifma, -mno-avx512ifma 2352 2353.. option:: -mavx512pf, -mno-avx512pf 2354 2355.. option:: -mavx512vbmi, -mno-avx512vbmi 2356 2357.. option:: -mavx512vbmi2, -mno-avx512vbmi2 2358 2359.. option:: -mavx512vl, -mno-avx512vl 2360 2361.. option:: -mavx512vnni, -mno-avx512vnni 2362 2363.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 2364 2365.. option:: -mbmi, -mno-bmi 2366 2367.. option:: -mbmi2, -mno-bmi2 2368 2369.. option:: -mclflushopt, -mno-clflushopt 2370 2371.. option:: -mclwb, -mno-clwb 2372 2373.. option:: -mclzero, -mno-clzero 2374 2375.. option:: -mcx16, -mno-cx16 2376 2377.. option:: -mf16c, -mno-f16c 2378 2379.. option:: -mfma, -mno-fma 2380 2381.. option:: -mfma4, -mno-fma4 2382 2383.. option:: -mfsgsbase, -mno-fsgsbase 2384 2385.. option:: -mfxsr, -mno-fxsr 2386 2387.. option:: -mgfni, -mno-gfni 2388 2389.. option:: -mibt, -mno-ibt 2390 2391.. option:: -mlwp, -mno-lwp 2392 2393.. option:: -mlzcnt, -mno-lzcnt 2394 2395.. option:: -mmmx, -mno-mmx 2396 2397.. option:: -mmovbe, -mno-movbe 2398 2399.. option:: -mmpx, -mno-mpx 2400 2401.. option:: -mmwaitx, -mno-mwaitx 2402 2403.. option:: -mpclmul, -mno-pclmul 2404 2405.. option:: -mpku, -mno-pku 2406 2407.. option:: -mpopcnt, -mno-popcnt 2408 2409.. option:: -mprefetchwt1, -mno-prefetchwt1 2410 2411.. option:: -mprfchw, -mno-prfchw 2412 2413.. option:: -mrdrnd, -mno-rdrnd 2414 2415.. option:: -mrdseed, -mno-rdseed 2416 2417.. option:: -mrtm, -mno-rtm 2418 2419.. option:: -msgx, -mno-sgx 2420 2421.. option:: -msha, -mno-sha 2422 2423.. option:: -mshstk, -mno-shstk 2424 2425.. option:: -msse, -mno-sse 2426 2427.. option:: -msse2, -mno-sse2 2428 2429.. option:: -msse3, -mno-sse3 2430 2431.. option:: -msse4.1, -mno-sse4.1 2432 2433.. program:: clang1 2434.. option:: -msse4.2, -mno-sse4.2, -msse4 2435.. program:: clang 2436 2437.. option:: -msse4a, -mno-sse4a 2438 2439.. option:: -mssse3, -mno-ssse3 2440 2441.. option:: -mtbm, -mno-tbm 2442 2443.. option:: -mvaes, -mno-vaes 2444 2445.. option:: -mvpclmulqdq, -mno-vpclmulqdq 2446 2447.. option:: -mx87, -m80387, -mno-x87 2448 2449.. option:: -mxop, -mno-xop 2450 2451.. option:: -mxsave, -mno-xsave 2452 2453.. option:: -mxsavec, -mno-xsavec 2454 2455.. option:: -mxsaveopt, -mno-xsaveopt 2456 2457.. option:: -mxsaves, -mno-xsaves 2458 2459Optimization level 2460~~~~~~~~~~~~~~~~~~ 2461 2462Flags controlling how much optimization should be performed. 2463 2464.. option:: -O<arg>, -O (equivalent to -O2), --optimize, --optimize=<arg> 2465 2466.. option:: -Ofast<arg> 2467 2468Debug information generation 2469~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2470 2471Flags controlling how much and what kind of debug information should be 2472generated. 2473 2474Kind and level of debug information 2475----------------------------------- 2476.. option:: -g, --debug, --debug=<arg> 2477 2478Generate source-level debug information 2479 2480.. option:: -gdwarf-2 2481 2482Generate source-level debug information with dwarf version 2 2483 2484.. option:: -gdwarf-3 2485 2486Generate source-level debug information with dwarf version 3 2487 2488.. option:: -gdwarf-4, -gdwarf 2489 2490Generate source-level debug information with dwarf version 4 2491 2492.. option:: -gdwarf-5 2493 2494Generate source-level debug information with dwarf version 5 2495 2496.. option:: -gfull 2497 2498.. option:: -gused 2499 2500Debug level 2501___________ 2502.. option:: -g0 2503 2504.. option:: -g2 2505 2506.. option:: -g3 2507 2508.. option:: -ggdb0 2509 2510.. option:: -ggdb1 2511 2512.. option:: -ggdb2 2513 2514.. option:: -ggdb3 2515 2516.. option:: -gline-tables-only, -g1, -gmlt 2517 2518Emit debug line number tables only 2519 2520.. option:: -gmodules 2521 2522Generate debug info with external references to clang modules or precompiled headers 2523 2524Debugger to tune debug information for 2525______________________________________ 2526.. option:: -ggdb 2527 2528.. option:: -glldb 2529 2530.. option:: -gsce 2531 2532Debug information flags 2533----------------------- 2534.. option:: -gcolumn-info, -gno-column-info 2535 2536.. option:: -gdwarf-aranges 2537 2538.. option:: -ggnu-pubnames 2539 2540.. option:: -grecord-gcc-switches, -gno-record-gcc-switches 2541 2542.. option:: -gsplit-dwarf 2543 2544.. option:: -gstrict-dwarf, -gno-strict-dwarf 2545 2546.. option:: -gz 2547 2548DWARF debug sections compression type 2549 2550.. program:: clang1 2551.. option:: -gz=<arg> 2552.. program:: clang 2553 2554DWARF debug sections compression type 2555 2556Static analyzer flags 2557===================== 2558 2559Flags controlling the behavior of the Clang Static Analyzer. 2560 2561.. option:: -Xanalyzer <arg> 2562 2563Pass <arg> to the static analyzer 2564 2565Fortran compilation flags 2566========================= 2567 2568Flags that will be passed onto the ``gfortran`` compiler when Clang is given 2569a Fortran input. 2570 2571.. option:: -A<arg>, --assert <arg>, --assert=<arg> 2572 2573.. option:: -A-<arg> 2574 2575.. option:: -J<arg> 2576 2577.. option:: -cpp 2578 2579.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 2580 2581.. option:: -falign-commons, -fno-align-commons 2582 2583.. option:: -fall-intrinsics, -fno-all-intrinsics 2584 2585.. option:: -fautomatic, -fno-automatic 2586 2587.. option:: -fbackslash, -fno-backslash 2588 2589.. option:: -fbacktrace, -fno-backtrace 2590 2591.. option:: -fblas-matmul-limit=<arg> 2592 2593.. option:: -fbounds-check, -fno-bounds-check 2594 2595.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 2596 2597.. option:: -fcheck=<arg> 2598 2599.. option:: -fcoarray=<arg> 2600 2601.. option:: -fconvert=<arg> 2602 2603.. option:: -fcray-pointer, -fno-cray-pointer 2604 2605.. option:: -fd-lines-as-code, -fno-d-lines-as-code 2606 2607.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 2608 2609.. option:: -fdefault-double-8, -fno-default-double-8 2610 2611.. option:: -fdefault-integer-8, -fno-default-integer-8 2612 2613.. option:: -fdefault-real-8, -fno-default-real-8 2614 2615.. option:: -fdollar-ok, -fno-dollar-ok 2616 2617.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 2618 2619.. option:: -fdump-fortran-original, -fno-dump-fortran-original 2620 2621.. option:: -fdump-parse-tree, -fno-dump-parse-tree 2622 2623.. option:: -fexternal-blas, -fno-external-blas 2624 2625.. option:: -ff2c, -fno-f2c 2626 2627.. option:: -ffixed-form, -fno-fixed-form 2628 2629.. option:: -ffixed-line-length-<arg> 2630 2631.. option:: -ffpe-trap=<arg> 2632 2633.. option:: -ffree-form, -fno-free-form 2634 2635.. option:: -ffree-line-length-<arg> 2636 2637.. option:: -ffrontend-optimize, -fno-frontend-optimize 2638 2639.. option:: -fimplicit-none, -fno-implicit-none 2640 2641.. option:: -finit-character=<arg> 2642 2643.. option:: -finit-integer=<arg> 2644 2645.. option:: -finit-local-zero, -fno-init-local-zero 2646 2647.. option:: -finit-logical=<arg> 2648 2649.. option:: -finit-real=<arg> 2650 2651.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 2652 2653.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 2654 2655.. option:: -fmax-array-constructor=<arg> 2656 2657.. option:: -fmax-errors=<arg> 2658 2659.. option:: -fmax-identifier-length, -fno-max-identifier-length 2660 2661.. option:: -fmax-stack-var-size=<arg> 2662 2663.. option:: -fmax-subrecord-length=<arg> 2664 2665.. option:: -fmodule-private, -fno-module-private 2666 2667.. option:: -fpack-derived, -fno-pack-derived 2668 2669.. option:: -fprotect-parens, -fno-protect-parens 2670 2671.. option:: -frange-check, -fno-range-check 2672 2673.. option:: -freal-4-real-10, -fno-real-4-real-10 2674 2675.. option:: -freal-4-real-16, -fno-real-4-real-16 2676 2677.. option:: -freal-4-real-8, -fno-real-4-real-8 2678 2679.. option:: -freal-8-real-10, -fno-real-8-real-10 2680 2681.. option:: -freal-8-real-16, -fno-real-8-real-16 2682 2683.. option:: -freal-8-real-4, -fno-real-8-real-4 2684 2685.. option:: -frealloc-lhs, -fno-realloc-lhs 2686 2687.. option:: -frecord-marker=<arg> 2688 2689.. option:: -frecursive, -fno-recursive 2690 2691.. option:: -frepack-arrays, -fno-repack-arrays 2692 2693.. option:: -fsecond-underscore, -fno-second-underscore 2694 2695.. option:: -fsign-zero, -fno-sign-zero 2696 2697.. option:: -fstack-arrays, -fno-stack-arrays 2698 2699.. option:: -funderscoring, -fno-underscoring 2700 2701.. option:: -fwhole-file, -fno-whole-file 2702 2703.. option:: -nocpp 2704 2705.. option:: -static-libgfortran 2706 2707Linker flags 2708============ 2709Flags that are passed on to the linker 2710 2711.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 2712 2713Add directory to library search path 2714 2715.. option:: -Mach 2716 2717.. option:: -T<script> 2718 2719Specify <script> as linker script 2720 2721.. option:: -Tbss<addr> 2722 2723Set starting address of BSS to <addr> 2724 2725.. option:: -Tdata<addr> 2726 2727Set starting address of BSS to <addr> 2728 2729.. option:: -Ttext<addr> 2730 2731Set starting address of BSS to <addr> 2732 2733.. option:: -Wl,<arg>,<arg2>... 2734 2735Pass the comma separated arguments in <arg> to the linker 2736 2737.. option:: -X 2738 2739.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 2740 2741Pass <arg> to the linker 2742 2743.. program:: clang1 2744.. option:: -Z 2745.. program:: clang 2746 2747.. option:: -e<arg>, --entry 2748 2749.. option:: -filelist <arg> 2750 2751.. option:: -l<arg> 2752 2753.. option:: -r 2754 2755.. option:: -rpath <arg> 2756 2757.. option:: -s 2758 2759.. option:: -t 2760 2761.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 2762 2763.. option:: -undef 2764 2765undef all system defines 2766 2767.. option:: -undefined<arg>, --no-undefined 2768 2769.. option:: -z <arg> 2770 2771Pass -z <arg> to the linker 2772 2773