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