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