1.. 2 ------------------------------------------------------------------- 3 NOTE: This file is automatically generated by running clang-tblgen 4 -gen-opt-docs. Do not edit this file by hand!! 5 ------------------------------------------------------------------- 6 7===================================== 8Clang command line argument reference 9===================================== 10.. contents:: 11 :local: 12 13Introduction 14============ 15 16This page lists the command line arguments currently supported by the 17GCC-compatible ``clang`` and ``clang++`` drivers. 18 19 20.. program:: clang 21.. option:: -B<dir>, --prefix <arg>, --prefix=<arg> 22 23Add <dir> to search path for binaries and object files used implicitly 24 25.. option:: -F<arg> 26 27Add directory to framework include search path 28 29.. option:: -ObjC 30 31Treat source input files as Objective-C inputs 32 33.. program:: clang1 34.. option:: -ObjC++ 35.. program:: clang 36 37Treat source input files as Objective-C++ inputs 38 39.. option:: -Qn, -fno-ident 40 41Do not emit metadata containing compiler name and version 42 43.. option:: -Qunused-arguments 44 45Don't emit warning for unused driver arguments 46 47.. option:: -Qy, -fident 48 49Emit metadata containing compiler name and version 50 51.. option:: -Wa,<arg>,<arg2>... 52 53Pass the comma separated arguments in <arg> to the assembler 54 55.. option:: -Wlarge-by-value-copy=<arg> 56 57.. option:: -Xarch\_<arg1> <arg2> 58 59.. program:: clang1 60.. option:: -Xarch\_device <arg> 61.. program:: clang 62 63Pass <arg> to the CUDA/HIP device compilation 64 65.. program:: clang2 66.. option:: -Xarch\_host <arg> 67.. program:: clang 68 69Pass <arg> to the CUDA/HIP host compilation 70 71.. option:: -Xcuda-fatbinary <arg> 72 73Pass <arg> to fatbinary invocation 74 75.. option:: -Xcuda-ptxas <arg> 76 77Pass <arg> to the ptxas assembler 78 79.. option:: -Xopenmp-target <arg> 80 81Pass <arg> to the target offloading toolchain. 82 83.. program:: clang1 84.. option:: -Xopenmp-target=<triple> <arg> 85.. program:: clang 86 87Pass <arg> to the target offloading toolchain identified by <triple>. 88 89.. option:: -Z<arg> 90 91.. option:: -a<arg>, --profile-blocks 92 93.. option:: -all\_load 94 95.. option:: -allowable\_client <arg> 96 97.. option:: --analyze 98 99Run the static analyzer 100 101.. option:: --analyzer-no-default-checks 102 103.. option:: --analyzer-output<arg> 104 105Static analyzer report output format (html\|plist\|plist-multi-file\|plist-html\|sarif\|text). 106 107.. option:: -ansi, --ansi 108 109.. option:: -arch <arg> 110 111.. program:: clang1 112.. option:: -arch\_errors\_fatal 113.. program:: clang 114 115.. program:: clang2 116.. option:: -arch\_only <arg> 117.. program:: clang 118 119.. option:: -arcmt-migrate-emit-errors 120 121Emit ARC errors even if the migrator can fix them 122 123.. option:: -arcmt-migrate-report-output <arg> 124 125Output path for the plist report 126 127.. option:: --autocomplete=<arg> 128 129.. option:: -bind\_at\_load 130 131.. option:: -bundle 132 133.. program:: clang1 134.. option:: -bundle\_loader <arg> 135.. program:: clang 136 137.. option:: -client\_name<arg> 138 139.. option:: -compatibility\_version<arg> 140 141.. option:: --config <arg> 142 143Specifies configuration file 144 145.. option:: --constant-cfstrings 146 147.. option:: --cuda-compile-host-device 148 149Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 150 151.. option:: --cuda-device-only 152 153Compile CUDA code for device only 154 155.. option:: --cuda-host-only 156 157Compile CUDA code for host only. Has no effect on non-CUDA compilations. 158 159.. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> 160 161Include PTX for the following GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. 162 163.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 164 165Enable device-side debug info generation. Disables ptxas optimizations. 166 167.. option:: -current\_version<arg> 168 169.. option:: -dead\_strip 170 171.. option:: -dependency-dot <arg> 172 173Filename to write DOT-formatted header dependencies to 174 175.. option:: -dependency-file <arg> 176 177Filename (or -) to write dependency output to 178 179.. option:: -dsym-dir<dir> 180 181Directory to output dSYM's (if any) to 182 183.. option:: -dumpmachine 184 185.. option:: -dumpversion 186 187.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 188 189.. option:: -dylib\_file <arg> 190 191.. option:: -dylinker 192 193.. program:: clang1 194.. option:: -dylinker\_install\_name<arg> 195.. program:: clang 196 197.. option:: -dynamic 198 199.. option:: -dynamiclib 200 201.. option:: -emit-ast 202 203Emit Clang AST files for source inputs 204 205.. option:: --emit-static-lib 206 207Enable linker job to emit a static library. 208 209.. option:: -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 210 211Trivial automatic variable initialization to zero is only here for benchmarks, it'll eventually be removed, and I'm OK with that because I'm only using it to benchmark 212 213.. option:: -exported\_symbols\_list <arg> 214 215.. option:: -faligned-new=<arg> 216 217.. option:: -fcuda-flush-denormals-to-zero, -fno-cuda-flush-denormals-to-zero 218 219Flush denormal floating point values to zero in CUDA device mode. 220 221.. option:: -ffixed-r19 222 223Reserve register r19 (Hexagon only) 224 225.. option:: -fheinous-gnu-extensions 226 227.. option:: -flat\_namespace 228 229.. option:: -fopenmp-targets=<arg1>,<arg2>... 230 231Specify comma-separated list of triples OpenMP offloading targets to be supported 232 233.. option:: -force\_cpusubtype\_ALL 234 235.. program:: clang1 236.. option:: -force\_flat\_namespace 237.. program:: clang 238 239.. program:: clang2 240.. option:: -force\_load <arg> 241.. program:: clang 242 243.. option:: -framework <arg> 244 245.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 246 247Add -rpath with architecture-specific resource directory to the linker flags 248 249.. option:: -fsanitize-system-blacklist=<arg> 250 251Path to system blacklist file for sanitizers 252 253.. option:: -fsystem-module 254 255Build this module as a system module. Only used with -emit-module 256 257.. option:: --gcc-toolchain=<arg>, -gcc-toolchain <arg> 258 259Use the gcc toolchain at the given directory 260 261.. option:: -gcodeview 262 263Generate CodeView debug information 264 265.. option:: -gcodeview-ghash, -gno-codeview-ghash 266 267Emit type record hashes in a .debug$H section 268 269.. option:: -ginline-line-tables, -gno-inline-line-tables 270 271.. option:: --gpu-instrument-lib=<arg> 272 273Instrument device library for HIP, which is a LLVM bitcode containing \_\_cyg\_profile\_func\_enter and \_\_cyg\_profile\_func\_exit 274 275.. option:: --gpu-max-threads-per-block=<arg> 276 277Default max threads per block for kernel launch bounds for HIP 278 279.. option:: -headerpad\_max\_install\_names<arg> 280 281.. option:: -help, --help 282 283Display available options 284 285.. option:: --help-hidden 286 287Display help for hidden options 288 289.. option:: --hip-link 290 291Link clang-offload-bundler bundles for HIP 292 293.. option:: --hip-version=<arg> 294 295HIP version in the format of major.minor.patch 296 297.. option:: -ibuiltininc 298 299Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it 300 301.. option:: -image\_base <arg> 302 303.. option:: -index-header-map 304 305Make the next included directory (-I or -F) an indexer header map 306 307.. option:: -init <arg> 308 309.. option:: -install\_name <arg> 310 311.. option:: -interface-stub-version=<arg> 312 313.. option:: -keep\_private\_externs 314 315.. option:: -lazy\_framework <arg> 316 317.. program:: clang1 318.. option:: -lazy\_library <arg> 319.. program:: clang 320 321.. option:: -mbig-endian, -EB 322 323.. option:: -mbranch-protection=<arg> 324 325Enforce targets of indirect branches and function returns 326 327.. option:: -mharden-sls=<arg> 328 329Select straight-line speculation hardening scope 330 331.. option:: --migrate 332 333Run the migrator 334 335.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 336 337.. option:: -mlinker-version=<arg> 338 339.. option:: -mlittle-endian, -EL 340 341.. option:: -mllvm <arg> 342 343Additional arguments to forward to LLVM's option processing 344 345.. option:: -module-dependency-dir <arg> 346 347Directory to dump module dependencies to 348 349.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 350 351.. option:: -multi\_module 352 353.. option:: -multiply\_defined <arg> 354 355.. program:: clang1 356.. option:: -multiply\_defined\_unused <arg> 357.. program:: clang 358 359.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 360 361.. option:: --no-cuda-version-check 362 363Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 364 365.. option:: -no-integrated-cpp, --no-integrated-cpp 366 367.. option:: -no\_dead\_strip\_inits\_and\_terms 368 369.. option:: -nobuiltininc 370 371Disable builtin #include directories 372 373.. option:: -nodefaultlibs 374 375.. option:: -nofixprebinding 376 377.. option:: -nogpuinc, -nocudainc 378 379.. option:: -nogpulib, -nocudalib 380 381Do not link device library for CUDA/HIP device compilation 382 383.. option:: -nolibc 384 385.. option:: -nomultidefs 386 387.. option:: -nopie, -no-pie 388 389.. option:: -noprebind 390 391.. option:: -noprofilelib 392 393.. option:: -noseglinkedit 394 395.. option:: -nostdinc, --no-standard-includes 396 397.. program:: clang1 398.. option:: -nostdinc++ 399.. program:: clang 400 401Disable standard #include directories for the C++ standard library 402 403.. option:: -nostdlib++ 404 405.. option:: -nostdlibinc 406 407.. option:: -o<file>, --output <arg>, --output=<arg> 408 409Write output to <file> 410 411.. option:: -objcmt-atomic-property 412 413Make migration to 'atomic' properties 414 415.. option:: -objcmt-migrate-all 416 417Enable migration to modern ObjC 418 419.. option:: -objcmt-migrate-annotation 420 421Enable migration to property and method annotations 422 423.. option:: -objcmt-migrate-designated-init 424 425Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 426 427.. option:: -objcmt-migrate-instancetype 428 429Enable migration to infer instancetype for method result type 430 431.. option:: -objcmt-migrate-literals 432 433Enable migration to modern ObjC literals 434 435.. option:: -objcmt-migrate-ns-macros 436 437Enable migration to NS\_ENUM/NS\_OPTIONS macros 438 439.. option:: -objcmt-migrate-property 440 441Enable migration to modern ObjC property 442 443.. option:: -objcmt-migrate-property-dot-syntax 444 445Enable migration of setter/getter messages to property-dot syntax 446 447.. option:: -objcmt-migrate-protocol-conformance 448 449Enable migration to add protocol conformance on classes 450 451.. option:: -objcmt-migrate-readonly-property 452 453Enable migration to modern ObjC readonly property 454 455.. option:: -objcmt-migrate-readwrite-property 456 457Enable migration to modern ObjC readwrite property 458 459.. option:: -objcmt-migrate-subscripting 460 461Enable migration to modern ObjC subscripting 462 463.. option:: -objcmt-ns-nonatomic-iosonly 464 465Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 466 467.. option:: -objcmt-returns-innerpointer-property 468 469Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 470 471.. option:: -objcmt-whitelist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg> 472 473Only modify files with a filename contained in the provided directory path 474 475.. option:: -object 476 477.. option:: --offload-arch=<arg>, --cuda-gpu-arch=<arg>, --no-offload-arch=<arg> 478 479CUDA offloading device architecture (e.g. sm\_35), or HIP offloading target ID in the form of a device architecture followed by target ID features delimited by a colon. Each target ID feature is a pre-defined string followed by a plus or minus sign (e.g. gfx908:xnack+:sram-ecc-). May be specified more than once. 480 481.. option:: -p, --profile 482 483.. option:: -pagezero\_size<arg> 484 485.. option:: -pg 486 487Enable mcount instrumentation 488 489.. option:: -pipe, --pipe 490 491Use pipes between commands, when possible 492 493.. option:: -prebind 494 495.. program:: clang1 496.. option:: -prebind\_all\_twolevel\_modules 497.. program:: clang 498 499.. option:: -preload 500 501.. option:: --print-diagnostic-categories 502 503.. option:: -print-effective-triple, --print-effective-triple 504 505Print the effective target triple 506 507.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 508 509Print the full library path of <file> 510 511.. option:: -print-ivar-layout 512 513Enable Objective-C Ivar layout bitmap print trace 514 515.. option:: -print-libgcc-file-name, --print-libgcc-file-name 516 517Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 518 519.. option:: -print-multi-directory, --print-multi-directory 520 521.. option:: -print-multi-lib, --print-multi-lib 522 523.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 524 525Print the full program path of <name> 526 527.. option:: -print-resource-dir, --print-resource-dir 528 529Print the resource directory pathname 530 531.. option:: -print-search-dirs, --print-search-dirs 532 533Print the paths used for finding libraries and programs 534 535.. option:: -print-target-triple, --print-target-triple 536 537Print the normalized target triple 538 539.. option:: -print-targets, --print-targets 540 541Print the registered targets 542 543.. option:: -private\_bundle 544 545.. option:: -pthread, -no-pthread 546 547Support POSIX threads in generated code 548 549.. option:: -pthreads 550 551.. option:: -read\_only\_relocs <arg> 552 553.. option:: -relocatable-pch, --relocatable-pch 554 555Whether to build a relocatable precompiled header 556 557.. option:: -remap 558 559.. option:: -rewrite-legacy-objc 560 561Rewrite Legacy Objective-C source to C++ 562 563.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 564 565Compiler runtime library to use 566 567.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 568 569Save llvm statistics. 570 571.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 572 573Save intermediate compilation results. 574 575.. option:: -sectalign <arg1> <arg2> <arg3> 576 577.. option:: -sectcreate <arg1> <arg2> <arg3> 578 579.. option:: -sectobjectsymbols <arg1> <arg2> 580 581.. option:: -sectorder <arg1> <arg2> <arg3> 582 583.. option:: -seg1addr<arg> 584 585.. option:: -seg\_addr\_table <arg> 586 587.. program:: clang1 588.. option:: -seg\_addr\_table\_filename <arg> 589.. program:: clang 590 591.. option:: -segaddr <arg1> <arg2> 592 593.. option:: -segcreate <arg1> <arg2> <arg3> 594 595.. option:: -seglinkedit 596 597.. option:: -segprot <arg1> <arg2> <arg3> 598 599.. option:: -segs\_read\_<arg> 600 601.. program:: clang1 602.. option:: -segs\_read\_only\_addr <arg> 603.. program:: clang 604 605.. program:: clang2 606.. option:: -segs\_read\_write\_addr <arg> 607.. program:: clang 608 609.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 610 611Serialize compiler diagnostics to a file 612 613.. option:: -shared-libgcc 614 615.. option:: -shared-libsan, -shared-libasan 616 617Dynamically link the sanitizer runtime 618 619.. option:: -single\_module 620 621.. option:: -static-libgcc 622 623.. option:: -static-libsan 624 625Statically link the sanitizer runtime 626 627.. option:: -static-libstdc++ 628 629.. option:: -static-openmp 630 631Use the static host OpenMP runtime while linking. 632 633.. option:: -std-default=<arg> 634 635.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 636 637C++ standard library to use 638 639.. option:: -sub\_library<arg> 640 641.. program:: clang1 642.. option:: -sub\_umbrella<arg> 643.. program:: clang 644 645.. option:: --sysroot=<arg>, --sysroot <arg> 646 647.. option:: --target-help 648 649.. option:: --target=<arg>, -target <arg> 650 651Generate code for the given target 652 653.. option:: -time 654 655Time individual commands 656 657.. option:: -traditional, --traditional 658 659.. option:: -traditional-cpp, --traditional-cpp 660 661Enable some traditional CPP emulation 662 663.. option:: -twolevel\_namespace 664 665.. program:: clang1 666.. option:: -twolevel\_namespace\_hints 667.. program:: clang 668 669.. option:: -umbrella <arg> 670 671.. option:: -unexported\_symbols\_list <arg> 672 673.. option:: -unwindlib=<arg>, --unwindlib=<arg> 674 675Unwind library to use 676 677.. option:: -v, --verbose 678 679Show commands to run and use verbose output 680 681.. option:: --verify-debug-info 682 683Verify the binary representation of debug output 684 685.. option:: --version 686 687Print version information 688 689.. option:: -w, --no-warnings 690 691Suppress all warnings 692 693.. option:: -weak-l<arg> 694 695.. option:: -weak\_framework <arg> 696 697.. program:: clang1 698.. option:: -weak\_library <arg> 699.. program:: clang 700 701.. program:: clang2 702.. option:: -weak\_reference\_mismatches <arg> 703.. program:: clang 704 705.. option:: -whatsloaded 706 707.. option:: -whyload 708 709.. option:: -working-directory<arg>, -working-directory=<arg> 710 711Resolve file paths relative to the specified directory 712 713.. option:: -x<language>, --language <arg>, --language=<arg> 714 715Treat subsequent input files as having type <language> 716 717.. option:: -y<arg> 718 719Actions 720======= 721The action to perform on the input. 722 723.. option:: -E, --preprocess 724 725Only run the preprocessor 726 727.. option:: -S, --assemble 728 729Only run preprocess and compilation steps 730 731.. option:: -c, --compile 732 733Only run preprocess, compile, and assemble steps 734 735.. option:: -emit-interface-stubs 736 737Generate Interface Stub Files. 738 739.. option:: -emit-llvm 740 741Use the LLVM representation for assembler and object files 742 743.. option:: -emit-merged-ifs 744 745Generate Interface Stub Files, emit merged text not binary. 746 747.. option:: -fsyntax-only 748 749.. option:: -module-file-info 750 751Provide information about a particular module file 752 753.. option:: --precompile 754 755Only precompile the input 756 757.. option:: -rewrite-objc 758 759Rewrite Objective-C source to C++ 760 761.. option:: -verify-pch 762 763Load and verify that a pre-compiled header file is not stale 764 765Compilation flags 766================= 767 768Flags controlling the behavior of Clang during compilation. These flags have 769no effect during actions that do not perform compilation. 770 771.. option:: -Xassembler <arg> 772 773Pass <arg> to the assembler 774 775.. option:: -Xclang <arg> 776 777Pass <arg> to the clang compiler 778 779.. option:: -fclang-abi-compat=<version> 780 781Attempt to match the ABI of Clang <version> 782 783.. option:: -fcomment-block-commands=<arg>,<arg2>... 784 785Treat each comma separated argument in <arg> as a documentation comment block command 786 787.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 788 789Require member pointer base types to be complete if they would be significant under the Microsoft ABI 790 791.. option:: -fcrash-diagnostics-dir=<arg> 792 793.. option:: -fdeclspec, -fno-declspec 794 795Allow \_\_declspec as a keyword 796 797.. option:: -fdepfile-entry=<arg> 798 799.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 800 801.. option:: -fdiagnostics-format=<arg> 802 803.. option:: -fdiagnostics-parseable-fixits 804 805Print fix-its in machine parseable form 806 807.. option:: -fdiagnostics-print-source-range-info 808 809Print source range spans in numeric form 810 811.. option:: -fdiagnostics-show-category=<arg> 812 813.. option:: -fdiscard-value-names, -fno-discard-value-names 814 815Discard value names in LLVM IR 816 817.. option:: -fexperimental-new-pass-manager, -fno-experimental-new-pass-manager 818 819Enables an experimental new pass manager in LLVM. 820 821.. option:: -fexperimental-strict-floating-point 822 823Enables experimental strict floating point in LLVM. 824 825.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 826 827Use separate accesses for consecutive bitfield runs with legal widths and alignments. 828 829.. option:: -fglobal-isel, -fexperimental-isel, -fno-global-isel 830 831Enables the global instruction selector 832 833.. option:: -finline-functions, -fno-inline-functions 834 835Inline suitable functions 836 837.. option:: -finline-hint-functions 838 839Inline functions which are (explicitly or implicitly) marked inline 840 841.. option:: -fno-crash-diagnostics 842 843Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 844 845.. option:: -fno-sanitize-blacklist 846 847Don't use blacklist file for sanitizers 848 849.. option:: -fparse-all-comments 850 851.. option:: -frecord-command-line, -fno-record-command-line, -frecord-gcc-switches 852 853.. option:: -fsanitize-address-field-padding=<arg> 854 855Level of field padding for AddressSanitizer 856 857.. option:: -fsanitize-address-globals-dead-stripping 858 859Enable linker dead stripping of globals in AddressSanitizer 860 861.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 862 863Enable poisoning array cookies when using custom operator new\[\] in AddressSanitizer 864 865.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 866 867Enable use-after-scope detection in AddressSanitizer 868 869.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 870 871Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 872 873.. option:: -fsanitize-blacklist=<arg> 874 875Path to blacklist file for sanitizers 876 877.. option:: -fsanitize-cfi-canonical-jump-tables, -fno-sanitize-cfi-canonical-jump-tables 878 879Make the jump table addresses canonical in the symbol table 880 881.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 882 883Enable control flow integrity (CFI) checks for cross-DSO calls. 884 885.. option:: -fsanitize-cfi-icall-generalize-pointers 886 887Generalize pointers in CFI indirect call type signature checks 888 889.. option:: -fsanitize-coverage-allowlist=<arg>, -fsanitize-coverage-whitelist=<arg> 890 891Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones 892 893.. option:: -fsanitize-coverage-blocklist=<arg>, -fsanitize-coverage-blacklist=<arg> 894 895Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones 896 897.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 898 899Specify the type of coverage instrumentation for Sanitizers 900 901.. option:: -fsanitize-hwaddress-abi=<arg> 902 903Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused. 904 905.. option:: -fsanitize-link-c++-runtime, -fno-sanitize-link-c++-runtime 906 907.. option:: -fsanitize-link-runtime, -fno-sanitize-link-runtime 908 909.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 910 911Enable origins tracking in MemorySanitizer 912 913.. program:: clang1 914.. option:: -fsanitize-memory-track-origins=<arg> 915.. program:: clang 916 917Enable origins tracking in MemorySanitizer 918 919.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 920 921Enable use-after-destroy detection in MemorySanitizer 922 923.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 924 925.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>..., -fsanitize-recover (equivalent to -fsanitize-recover=all) 926 927Enable recovery for specified sanitizers 928 929.. option:: -fsanitize-stats, -fno-sanitize-stats 930 931Enable sanitizer statistics gathering. 932 933.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 934 935Enable atomic operations instrumentation in ThreadSanitizer (default) 936 937.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 938 939Enable function entry/exit instrumentation in ThreadSanitizer (default) 940 941.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 942 943Enable memory access instrumentation in ThreadSanitizer (default) 944 945.. option:: -fsanitize-trap=<arg1>,<arg2>..., -fno-sanitize-trap=<arg1>,<arg2>..., -fsanitize-trap (equivalent to -fsanitize-trap=all), -fsanitize-undefined-trap-on-error (equivalent to -fsanitize-trap=undefined) 946 947Enable trapping for specified sanitizers 948 949.. option:: -fsanitize-undefined-strip-path-components=<number> 950 951Strip (or keep only, if negative) a given number of path components when emitting check metadata. 952 953.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 954 955Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 956 957.. option:: -moutline, -mno-outline 958 959Enable function outlining (AArch64 only) 960 961.. option:: --param <arg>, --param=<arg> 962 963.. option:: -print-supported-cpus, --print-supported-cpus, -mcpu=?, -mtune=? 964 965Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target) 966 967.. option:: -std=<arg>, --std=<arg>, --std <arg> 968 969Language standard to compile for 970 971Preprocessor flags 972~~~~~~~~~~~~~~~~~~ 973 974Flags controlling the behavior of the Clang preprocessor. 975 976.. option:: -C, --comments 977 978Include comments in preprocessed output 979 980.. option:: -CC, --comments-in-macros 981 982Include comments from within macros in preprocessed output 983 984.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 985 986Define <macro> to <value> (or 1 if <value> omitted) 987 988.. option:: -H, --trace-includes 989 990Show header includes and nesting depth 991 992.. option:: -P, --no-line-commands 993 994Disable linemarker output in -E mode 995 996.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 997 998Undefine macro <macro> 999 1000.. option:: -Wp,<arg>,<arg2>... 1001 1002Pass the comma separated arguments in <arg> to the preprocessor 1003 1004.. option:: -Xpreprocessor <arg> 1005 1006Pass <arg> to the preprocessor 1007 1008.. option:: -fmacro-prefix-map=<arg> 1009 1010remap file source paths in predefined preprocessor macros 1011 1012Include path management 1013----------------------- 1014 1015Flags controlling how ``#include``\s are resolved to files. 1016 1017.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 1018 1019Add directory to include search path. For C++ input, if 1020there are multiple -I options, these directories are searched 1021in the order they are given before the standard system directories 1022are searched. If the same directory is in the SYSTEM include search 1023paths, for example if also specified with -isystem, the -I option 1024will be ignored 1025 1026.. option:: -I-, --include-barrier 1027 1028Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 1029 1030.. option:: --cuda-path-ignore-env 1031 1032Ignore environment variables to detect CUDA installation 1033 1034.. option:: --cuda-path=<arg> 1035 1036CUDA installation path 1037 1038.. option:: -cxx-isystem<directory> 1039 1040Add directory to the C++ SYSTEM include search path 1041 1042.. option:: -fbuild-session-file=<file> 1043 1044Use the last modification time of <file> as the build session timestamp 1045 1046.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 1047 1048Time when the current build session started 1049 1050.. option:: -fmodule-file=\[<name>=\]<file> 1051 1052Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 1053 1054.. option:: -fmodules-cache-path=<directory> 1055 1056Specify the module cache path 1057 1058.. option:: -fmodules-disable-diagnostic-validation 1059 1060Disable validation of the diagnostic options when loading the module 1061 1062.. option:: -fmodules-prune-after=<seconds> 1063 1064Specify the interval (in seconds) after which a module file will be considered unused 1065 1066.. option:: -fmodules-prune-interval=<seconds> 1067 1068Specify the interval (in seconds) between attempts to prune the module cache 1069 1070.. option:: -fmodules-user-build-path <directory> 1071 1072Specify the module user build path 1073 1074.. option:: -fmodules-validate-once-per-build-session 1075 1076Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 1077 1078.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 1079 1080Validate the system headers that a module depends on when loading the module 1081 1082.. option:: -fprebuilt-module-path=<directory> 1083 1084Specify the prebuilt module path 1085 1086.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1087 1088Add directory to AFTER include search path 1089 1090.. option:: -iframework<arg> 1091 1092Add directory to SYSTEM framework search path 1093 1094.. option:: -iframeworkwithsysroot<directory> 1095 1096Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1097 1098.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1099 1100Include macros from file before parsing 1101 1102.. option:: -include<file>, --include<file>, --include=<arg> 1103 1104Include file before parsing 1105 1106.. option:: -include-pch <file> 1107 1108Include precompiled header file 1109 1110.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1111 1112Set the -iwithprefix/-iwithprefixbefore prefix 1113 1114.. option:: -iquote<directory> 1115 1116Add directory to QUOTE include search path 1117 1118.. option:: -isysroot<dir> 1119 1120Set the system root directory (usually /) 1121 1122.. option:: -isystem<directory> 1123 1124Add directory to SYSTEM include search path 1125 1126.. option:: -isystem-after<directory> 1127 1128Add directory to end of the SYSTEM include search path 1129 1130.. option:: -ivfsoverlay<arg> 1131 1132Overlay the virtual filesystem described by file over the real file system 1133 1134.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1135 1136Set directory to SYSTEM include search path with prefix 1137 1138.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1139 1140Set directory to include search path with prefix 1141 1142.. option:: -iwithsysroot<directory> 1143 1144Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1145 1146.. option:: --libomptarget-nvptx-path=<arg> 1147 1148Path to libomptarget-nvptx libraries 1149 1150.. option:: --ptxas-path=<arg> 1151 1152Path to ptxas (used for compiling CUDA code) 1153 1154.. option:: --rocm-path=<arg> 1155 1156ROCm installation path, used for finding and automatically linking required bitcode libraries. 1157 1158.. program:: clang1 1159.. option:: -stdlib++-isystem<directory> 1160.. program:: clang 1161 1162Use directory as the C++ standard library include path 1163 1164.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1165 1166Treat all #include paths starting with <prefix> as including a system header. 1167 1168Dependency file generation 1169-------------------------- 1170 1171Flags controlling generation of a dependency file for ``make``-like build 1172systems. 1173 1174.. option:: -M, --dependencies 1175 1176Like -MD, but also implies -E and writes to stdout by default 1177 1178.. option:: -MD, --write-dependencies 1179 1180Write a depfile containing user and system headers 1181 1182.. option:: -MF<file> 1183 1184Write depfile output from -MMD, -MD, -MM, or -M to <file> 1185 1186.. option:: -MG, --print-missing-file-dependencies 1187 1188Add missing headers to depfile 1189 1190.. option:: -MJ<arg> 1191 1192Write a compilation database entry per input 1193 1194.. option:: -MM, --user-dependencies 1195 1196Like -MMD, but also implies -E and writes to stdout by default 1197 1198.. option:: -MMD, --write-user-dependencies 1199 1200Write a depfile containing user headers 1201 1202.. option:: -MP 1203 1204Create phony target for each dependency (other than main file) 1205 1206.. option:: -MQ<arg> 1207 1208Specify name of main file output to quote in depfile 1209 1210.. option:: -MT<arg> 1211 1212Specify name of main file output in depfile 1213 1214.. option:: -MV 1215 1216Use NMake/Jom format for the depfile 1217 1218Dumping preprocessor state 1219-------------------------- 1220 1221Flags allowing the state of the preprocessor to be dumped in various ways. 1222 1223.. option:: -d 1224 1225.. program:: clang1 1226.. option:: -d<arg> 1227.. program:: clang 1228 1229.. option:: -dD 1230 1231Print macro definitions in -E mode in addition to normal output 1232 1233.. option:: -dI 1234 1235Print include directives in -E mode in addition to normal output 1236 1237.. option:: -dM 1238 1239Print macro definitions in -E mode instead of normal output 1240 1241Diagnostic flags 1242~~~~~~~~~~~~~~~~ 1243 1244Flags controlling which warnings, errors, and remarks Clang will generate. 1245See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1246 1247.. option:: -R<remark> 1248 1249Enable the specified remark 1250 1251.. option:: -Rpass-analysis=<arg> 1252 1253Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1254 1255.. option:: -Rpass-missed=<arg> 1256 1257Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1258 1259.. option:: -Rpass=<arg> 1260 1261Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1262 1263.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1264 1265Enable the specified warning 1266 1267.. option:: -Wdeprecated, -Wno-deprecated 1268 1269Enable warnings for deprecated constructs and define \_\_DEPRECATED 1270 1271.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1272 1273Target-independent compilation options 1274~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1275.. option:: -Wframe-larger-than=<arg> 1276 1277.. option:: -fPIC, -fno-PIC 1278 1279.. option:: -fPIE, -fno-PIE 1280 1281.. option:: -faddrsig, -fno-addrsig 1282 1283Emit an address-significance table 1284 1285.. option:: -falign-functions, -fno-align-functions 1286 1287.. program:: clang1 1288.. option:: -falign-functions=<arg> 1289.. program:: clang 1290 1291.. program:: clang1 1292.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1293.. program:: clang 1294 1295Enable C++17 aligned allocation functions 1296 1297.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1298 1299Treat editor placeholders as valid source code 1300 1301.. option:: -fallow-unsupported 1302 1303.. option:: -faltivec, -fno-altivec 1304 1305.. option:: -fansi-escape-codes 1306 1307Use ANSI escape codes for diagnostics 1308 1309.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1310 1311Use Apple's kernel extensions ABI 1312 1313.. option:: -fapple-link-rtlib 1314 1315Force linking the clang builtins runtime library 1316 1317.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1318 1319Enable Apple gcc-compatible #pragma pack handling 1320 1321.. option:: -fapplication-extension, -fno-application-extension 1322 1323Restrict code to those available for App Extensions 1324 1325.. option:: -fasm, -fno-asm 1326 1327.. option:: -fasm-blocks, -fno-asm-blocks 1328 1329.. option:: -fassociative-math, -fno-associative-math 1330 1331.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1332 1333.. option:: -fast 1334 1335.. option:: -fastcp 1336 1337.. option:: -fastf 1338 1339.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1340 1341.. option:: -fautolink, -fno-autolink 1342 1343.. option:: -fbasic-block-sections=<arg> 1344 1345Generate labels for each basic block or place each basic block or a subset of basic blocks in its own section. 1346 1347.. option:: -fblocks, -fno-blocks 1348 1349Enable the 'blocks' language feature 1350 1351.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1352 1353.. option:: -fborland-extensions, -fno-borland-extensions 1354 1355Accept non-standard constructs supported by the Borland compiler 1356 1357.. option:: -fbracket-depth=<arg> 1358 1359.. option:: -fbuiltin, -fno-builtin 1360 1361.. option:: -fbuiltin-module-map 1362 1363Load the clang builtins module map file. 1364 1365.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1366 1367.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1368 1369.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1370 1371Instrument control-flow architecture protection. Options: return, branch, full, none. 1372 1373.. option:: -fcf-runtime-abi=<arg> 1374 1375.. option:: -fchar8\_t, -fno-char8\_t 1376 1377Enable C++ builtin type char8\_t 1378 1379.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1380 1381.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1382 1383Enable colors in diagnostics 1384 1385.. option:: -fcommon, -fno-common 1386 1387Place uninitialized global variables in a common block 1388 1389.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1390 1391.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1392 1393.. option:: -fconstant-string-class=<arg> 1394 1395.. option:: -fconstexpr-backtrace-limit=<arg> 1396 1397.. option:: -fconstexpr-depth=<arg> 1398 1399.. option:: -fconstexpr-steps=<arg> 1400 1401.. option:: -fconvergent-functions 1402 1403Assume functions may be convergent 1404 1405.. option:: -fcoroutines-ts, -fno-coroutines-ts 1406 1407Enable support for the C++ Coroutines TS 1408 1409.. option:: -fcoverage-mapping, -fno-coverage-mapping 1410 1411Generate coverage mapping to enable code coverage analysis 1412 1413.. option:: -fcreate-profile 1414 1415.. option:: -fcs-profile-generate 1416 1417Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1418 1419.. program:: clang1 1420.. option:: -fcs-profile-generate=<directory> 1421.. program:: clang 1422 1423Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1424 1425.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 1426 1427Use approximate transcendental functions 1428 1429.. option:: -fcuda-short-ptr, -fno-cuda-short-ptr 1430 1431Use 32-bit pointers for accessing const/local/shared address spaces 1432 1433.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1434 1435Enable C++ exceptions 1436 1437.. option:: -fcxx-modules, -fno-cxx-modules 1438 1439.. option:: -fdata-sections, -fno-data-sections 1440 1441Place each data in its own section 1442 1443.. option:: -fdebug-compilation-dir <arg>, -fdebug-compilation-dir=<arg> 1444 1445The compilation directory to embed in the debug info. 1446 1447.. option:: -fdebug-default-version=<arg> 1448 1449Default DWARF version to use, if a -g option caused DWARF debug info to be produced 1450 1451.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1452 1453Emit extra debug info to make sample profile more accurate 1454 1455.. option:: -fdebug-macro, -fno-debug-macro 1456 1457Emit macro debug information 1458 1459.. option:: -fdebug-pass-arguments 1460 1461.. option:: -fdebug-pass-structure 1462 1463.. option:: -fdebug-prefix-map=<arg> 1464 1465remap file source paths in debug info 1466 1467.. option:: -fdebug-ranges-base-address, -fno-debug-ranges-base-address 1468 1469Use DWARF base address selection entries in .debug\_ranges 1470 1471.. option:: -fdebug-types-section, -fno-debug-types-section 1472 1473Place debug types in their own section (ELF Only) 1474 1475.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1476 1477Parse templated function definitions at the end of the translation unit 1478 1479.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1480 1481Treat usage of null pointers as undefined behavior (default) 1482 1483.. option:: -fdenormal-fp-math=<arg> 1484 1485.. option:: -fdiagnostics-absolute-paths 1486 1487Print absolute paths in diagnostics 1488 1489.. option:: -fdiagnostics-color, -fno-diagnostics-color 1490 1491.. program:: clang1 1492.. option:: -fdiagnostics-color=<arg> 1493.. program:: clang 1494 1495.. option:: -fdiagnostics-hotness-threshold=<number> 1496 1497Prevent optimization remarks from being output if they do not have at least this profile count 1498 1499.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1500 1501Enable profile hotness information in diagnostic line 1502 1503.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1504 1505Display include stacks for diagnostic notes 1506 1507.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1508 1509Print option name with mappable diagnostics 1510 1511.. option:: -fdiagnostics-show-template-tree 1512 1513Print a template comparison tree for differing templates 1514 1515.. option:: -fdigraphs, -fno-digraphs 1516 1517Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1518 1519.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1520 1521Allow '$' in identifiers 1522 1523.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1524 1525Enable '\[\[\]\]' attributes in all C and C++ language modes 1526 1527.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1528 1529.. option:: -fdwarf-exceptions 1530 1531Use DWARF style exceptions 1532 1533.. option:: -felide-constructors, -fno-elide-constructors 1534 1535.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1536 1537.. option:: -feliminate-unused-debug-types, -fno-eliminate-unused-debug-types 1538 1539Do not emit debug info for defined but unused types 1540 1541.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1542 1543Embed LLVM bitcode (option: off, all, bitcode, marker) 1544 1545.. option:: -femit-all-decls 1546 1547Emit all declarations, even if unused 1548 1549.. option:: -femulated-tls, -fno-emulated-tls 1550 1551Use emutls functions to access thread\_local variables 1552 1553.. option:: -fenable-matrix 1554 1555Enable matrix data type and related builtin functions 1556 1557.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1558 1559.. option:: -ferror-limit=<arg> 1560 1561.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1562 1563.. option:: -fexceptions, -fno-exceptions 1564 1565Enable support for exception handling 1566 1567.. option:: -fexec-charset=<arg> 1568 1569.. option:: -fexperimental-new-constant-interpreter 1570 1571Enable the experimental new constant interpreter 1572 1573.. option:: -fexperimental-relative-c++-abi-vtables, -fno-experimental-relative-c++-abi-vtables 1574 1575Use the experimental C++ class ABI for classes with virtual tables 1576 1577.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1578 1579.. option:: -ffast-math, -fno-fast-math 1580 1581Allow aggressive, lossy floating-point optimizations 1582 1583.. option:: -ffile-prefix-map=<arg> 1584 1585remap file source paths in debug info and predefined preprocessor macros 1586 1587.. option:: -ffinite-math-only, -fno-finite-math-only 1588 1589.. option:: -ffixed-point, -fno-fixed-point 1590 1591Enable fixed point types 1592 1593.. option:: -ffor-scope, -fno-for-scope 1594 1595.. option:: -fforce-dwarf-frame, -fno-force-dwarf-frame 1596 1597Always emit a debug frame section 1598 1599.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1600 1601Emits more virtual tables to improve devirtualization 1602 1603.. option:: -fforce-enable-int128, -fno-force-enable-int128 1604 1605Enable support for int128\_t type 1606 1607.. option:: -ffp-contract=<arg> 1608 1609Form fused FP ops (e.g. FMAs): fast (everywhere) \| on (according to FP\_CONTRACT pragma) \| off (never fuse). Default is 'fast' for CUDA/HIP and 'on' otherwise. 1610 1611.. option:: -ffp-exception-behavior=<arg> 1612 1613Specifies the exception behavior of floating-point operations. 1614 1615.. option:: -ffp-model=<arg> 1616 1617Controls the semantics of floating-point calculations. 1618 1619.. option:: -ffreestanding 1620 1621Assert that the compilation takes place in a freestanding environment 1622 1623.. option:: -ffunction-sections, -fno-function-sections 1624 1625Place each function in its own section 1626 1627.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1628 1629.. option:: -fgnu-keywords, -fno-gnu-keywords 1630 1631Allow GNU-extension keywords regardless of language standard 1632 1633.. option:: -fgnu-runtime 1634 1635Generate output compatible with the standard GNU Objective-C runtime 1636 1637.. option:: -fgnu89-inline, -fno-gnu89-inline 1638 1639Use the gnu89 inline semantics 1640 1641.. option:: -fgnuc-version=<arg> 1642 1643Sets various macros to claim compatibility with the given GCC version (default is 4.2.1) 1644 1645.. option:: -fgpu-allow-device-init, -fno-gpu-allow-device-init 1646 1647Allow device side init function in HIP 1648 1649.. option:: -fgpu-defer-diag, -fno-gpu-defer-diag 1650 1651Defer host/device related diagnostic messages for CUDA/HIP 1652 1653.. option:: -fgpu-rdc, -fcuda-rdc, -fno-gpu-rdc 1654 1655Generate relocatable device code, also known as separate compilation mode 1656 1657.. option:: -fhip-new-launch-api, -fno-hip-new-launch-api 1658 1659Use new kernel launching API for HIP 1660 1661.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1662 1663.. option:: -fhonor-nans, -fno-honor-nans 1664 1665.. option:: -fhosted 1666 1667.. option:: -fignore-exceptions 1668 1669Enable support for ignoring exception handling constructs 1670 1671.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1672 1673Implicitly search the file system for module map files. 1674 1675.. option:: -fimplicit-modules, -fno-implicit-modules 1676 1677.. option:: -finput-charset=<arg> 1678 1679.. option:: -finstrument-function-entry-bare 1680 1681Instrument function entry only, after inlining, without arguments to the instrumentation call 1682 1683.. option:: -finstrument-functions 1684 1685Generate calls to instrument function entry and exit 1686 1687.. option:: -finstrument-functions-after-inlining 1688 1689Like -finstrument-functions, but insert the calls after inlining 1690 1691.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1692 1693Enable the integrated assembler 1694 1695.. option:: -fintegrated-cc1, -fno-integrated-cc1 1696 1697Run cc1 in-process 1698 1699.. option:: -fjump-tables, -fno-jump-tables 1700 1701Use jump tables for lowering switches 1702 1703.. option:: -fkeep-static-consts, -fno-keep-static-consts 1704 1705Keep static const variables if unused 1706 1707.. option:: -flax-vector-conversions=<arg>, -flax-vector-conversions (equivalent to -flax-vector-conversions=integer), -fno-lax-vector-conversions (equivalent to -flax-vector-conversions=none) 1708 1709Enable implicit vector bit-casts 1710 1711.. option:: -flimited-precision=<arg> 1712 1713.. option:: -flto, -fno-lto 1714 1715Enable LTO in 'full' mode 1716 1717.. option:: -flto-jobs=<arg> 1718 1719Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1720 1721.. program:: clang1 1722.. option:: -flto=<arg> 1723.. program:: clang 1724 1725Set LTO mode to either 'full' or 'thin' 1726 1727.. option:: -fmacro-backtrace-limit=<arg> 1728 1729.. option:: -fmath-errno, -fno-math-errno 1730 1731Require math functions to indicate errors by setting errno 1732 1733.. option:: -fmax-tokens=<arg> 1734 1735Max total number of preprocessed tokens for -Wmax-tokens. 1736 1737.. option:: -fmax-type-align=<arg> 1738 1739Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1740 1741.. option:: -fmemory-profile, -fno-memory-profile 1742 1743Enable heap memory profiling 1744 1745.. option:: -fmerge-all-constants, -fno-merge-all-constants 1746 1747Allow merging of constants 1748 1749.. option:: -fmessage-length=<arg> 1750 1751Format message diagnostics so that they fit within N columns 1752 1753.. option:: -fmodule-file-deps, -fno-module-file-deps 1754 1755.. option:: -fmodule-map-file=<file> 1756 1757Load this module map file 1758 1759.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg>, -fmodule-name <arg> 1760 1761Specify the name of the module to build 1762 1763.. option:: -fmodules, -fno-modules 1764 1765Enable the 'modules' language feature 1766 1767.. option:: -fmodules-decluse, -fno-modules-decluse 1768 1769Require declaration of modules used within a module 1770 1771.. option:: -fmodules-ignore-macro=<arg> 1772 1773Ignore the definition of the given macro when building and loading modules 1774 1775.. option:: -fmodules-search-all, -fno-modules-search-all 1776 1777Search even non-imported modules to resolve references 1778 1779.. option:: -fmodules-strict-decluse 1780 1781Like -fmodules-decluse but requires all headers to be in modules 1782 1783.. option:: -fmodules-ts 1784 1785Enable support for the C++ Modules TS 1786 1787.. option:: -fmodules-validate-input-files-content 1788 1789Validate PCM input files based on content if mtime differs 1790 1791.. option:: -fms-compatibility, -fno-ms-compatibility 1792 1793Enable full Microsoft Visual C++ compatibility 1794 1795.. option:: -fms-compatibility-version=<arg> 1796 1797Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1798 1799.. option:: -fms-extensions, -fno-ms-extensions 1800 1801Accept some non-standard constructs supported by the Microsoft compiler 1802 1803.. option:: -fms-memptr-rep=<arg> 1804 1805.. option:: -fms-volatile 1806 1807.. option:: -fmsc-version=<arg> 1808 1809Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1810 1811.. option:: -fmudflap 1812 1813.. option:: -fmudflapth 1814 1815.. option:: -fnested-functions 1816 1817.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1818 1819Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1820 1821.. option:: -fnext-runtime 1822 1823.. option:: -fno-access-control, -fno-no-access-control 1824 1825.. option:: -fno-builtin-<arg> 1826 1827Disable implicit builtin knowledge of a specific function 1828 1829.. option:: -fno-elide-type 1830 1831Do not elide types when printing diagnostics 1832 1833.. option:: -fno-max-type-align 1834 1835.. option:: -fno-operator-names 1836 1837Do not treat C++ operator name keywords as synonyms for operators 1838 1839.. option:: -fno-strict-modules-decluse 1840 1841.. option:: -fno-temp-file 1842 1843Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes 1844 1845.. option:: -fno-working-directory 1846 1847.. option:: -fno\_modules-validate-input-files-content 1848 1849.. program:: clang1 1850.. option:: -fno\_pch-validate-input-files-content 1851.. program:: clang 1852 1853.. option:: -fnoxray-link-deps 1854 1855.. option:: -fobjc-abi-version=<arg> 1856 1857.. option:: -fobjc-arc, -fno-objc-arc 1858 1859Synthesize retain and release calls for Objective-C pointers 1860 1861.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 1862 1863Use EH-safe code when synthesizing retains and releases in -fobjc-arc 1864 1865.. option:: -fobjc-convert-messages-to-runtime-calls, -fno-objc-convert-messages-to-runtime-calls 1866 1867.. option:: -fobjc-exceptions, -fno-objc-exceptions 1868 1869Enable Objective-C exceptions 1870 1871.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 1872 1873.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 1874 1875.. option:: -fobjc-link-runtime 1876 1877.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 1878 1879.. option:: -fobjc-nonfragile-abi-version=<arg> 1880 1881.. option:: -fobjc-runtime=<arg> 1882 1883Specify the target Objective-C runtime kind and version 1884 1885.. option:: -fobjc-sender-dependent-dispatch 1886 1887.. option:: -fobjc-weak, -fno-objc-weak 1888 1889Enable ARC-style weak references in Objective-C 1890 1891.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 1892 1893.. option:: -fopenmp, -fno-openmp 1894 1895Parse OpenMP pragmas and generate parallel code. 1896 1897.. option:: -fopenmp-simd, -fno-openmp-simd 1898 1899Emit OpenMP code only for SIMD-based constructs. 1900 1901.. option:: -fopenmp-version=<arg> 1902 1903.. program:: clang1 1904.. option:: -fopenmp=<arg> 1905.. program:: clang 1906 1907.. option:: -foperator-arrow-depth=<arg> 1908 1909.. option:: -foptimization-record-file=<file> 1910 1911Specify the output name of the file containing the optimization remarks. Implies -fsave-optimization-record. On Darwin platforms, this cannot be used with multiple -arch <arch> options. 1912 1913.. option:: -foptimization-record-passes=<regex> 1914 1915Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) 1916 1917.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 1918 1919.. option:: -forder-file-instrumentation 1920 1921Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 1922 1923.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 1924 1925.. option:: -fpack-struct, -fno-pack-struct 1926 1927.. program:: clang1 1928.. option:: -fpack-struct=<arg> 1929.. program:: clang 1930 1931Specify the default maximum struct packing alignment 1932 1933.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 1934 1935Recognize and construct Pascal-style string literals 1936 1937.. option:: -fpass-plugin=<dsopath> 1938 1939Load pass plugin from a dynamic shared object file (only with new pass manager). 1940 1941.. option:: -fpatchable-function-entry=<N,M> 1942 1943Generate M NOPs before function entry and N-M NOPs after function entry 1944 1945.. option:: -fpcc-struct-return 1946 1947Override the default ABI to return all structs on the stack 1948 1949.. option:: -fpch-codegen, -fno-pch-codegen 1950 1951Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH 1952 1953.. option:: -fpch-debuginfo, -fno-pch-debuginfo 1954 1955Generate debug info for types in an object file built from this PCH and do not generate them elsewhere 1956 1957.. option:: -fpch-instantiate-templates, -fno-pch-instantiate-templates 1958 1959Instantiate templates already while building a PCH 1960 1961.. option:: -fpch-preprocess 1962 1963.. option:: -fpch-validate-input-files-content 1964 1965Validate PCH input files based on content if mtime differs 1966 1967.. option:: -fpic, -fno-pic 1968 1969.. option:: -fpie, -fno-pie 1970 1971.. option:: -fplt, -fno-plt 1972 1973.. option:: -fplugin=<dsopath> 1974 1975Load the named plugin (dynamic shared object) 1976 1977.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 1978 1979.. option:: -fprofile-arcs, -fno-profile-arcs 1980 1981.. option:: -fprofile-dir=<arg> 1982 1983.. option:: -fprofile-exclude-files=<arg> 1984 1985Instrument only functions from files where names don't match all the regexes separated by a semi-colon 1986 1987.. option:: -fprofile-filter-files=<arg> 1988 1989Instrument only functions from files where names match any regex separated by a semi-colon 1990 1991.. option:: -fprofile-generate, -fno-profile-generate 1992 1993Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1994 1995.. program:: clang1 1996.. option:: -fprofile-generate=<directory> 1997.. program:: clang 1998 1999Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 2000 2001.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 2002 2003Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 2004 2005.. program:: clang1 2006.. option:: -fprofile-instr-generate=<file> 2007.. program:: clang 2008 2009Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 2010 2011.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 2012 2013.. program:: clang1 2014.. option:: -fprofile-instr-use=<arg> 2015.. program:: clang 2016 2017Use instrumentation data for profile-guided optimization 2018 2019.. option:: -fprofile-remapping-file=<file>, -fprofile-remapping-file <arg> 2020 2021Use the remappings described in <file> to match the profile data against names in the program 2022 2023.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 2024 2025Specifies that the sample profile is accurate. If the sample 2026 profile is accurate, callsites without profile samples are marked 2027 as cold. Otherwise, treat callsites without profile samples as if 2028 we have no profile 2029 2030.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 2031 2032.. program:: clang1 2033.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 2034.. program:: clang 2035 2036Enable sample-based profile guided optimizations 2037 2038.. option:: -fprofile-update=<method> 2039 2040Set update method of profile counters (atomic,prefer-atomic,single) 2041 2042.. program:: clang1 2043.. option:: -fprofile-use=<pathname> 2044.. program:: clang 2045 2046Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 2047 2048.. option:: -freciprocal-math, -fno-reciprocal-math 2049 2050Allow division operations to be reassociated 2051 2052.. option:: -freg-struct-return 2053 2054Override the default ABI to return small structs in registers 2055 2056.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 2057 2058Use atexit or \_\_cxa\_atexit to register global destructors 2059 2060.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 2061 2062Enable C++17 relaxed template template argument matching 2063 2064.. option:: -freroll-loops, -fno-reroll-loops 2065 2066Turn on loop reroller 2067 2068.. option:: -fretain-comments-from-system-headers 2069 2070.. option:: -frewrite-imports, -fno-rewrite-imports 2071 2072.. option:: -frewrite-includes, -fno-rewrite-includes 2073 2074.. option:: -frewrite-map-file <arg> 2075 2076.. program:: clang1 2077.. option:: -frewrite-map-file=<arg> 2078.. program:: clang 2079 2080.. option:: -fropi, -fno-ropi 2081 2082Generate read-only position independent code (ARM only) 2083 2084.. option:: -frounding-math, -fno-rounding-math 2085 2086.. option:: -frtti, -fno-rtti 2087 2088.. option:: -frtti-data, -fno-rtti-data 2089 2090.. option:: -frwpi, -fno-rwpi 2091 2092Generate read-write position independent code (ARM only) 2093 2094.. option:: -fsave-optimization-record, -fno-save-optimization-record 2095 2096Generate a YAML optimization record file 2097 2098.. program:: clang1 2099.. option:: -fsave-optimization-record=<format> 2100.. program:: clang 2101 2102Generate an optimization record file in a specific format 2103 2104.. option:: -fseh-exceptions 2105 2106Use SEH style exceptions 2107 2108.. option:: -fsemantic-interposition, -fno-semantic-interposition 2109 2110.. option:: -fshort-enums, -fno-short-enums 2111 2112Allocate to an enum type only as many bytes as it needs for the declared range of possible values 2113 2114.. option:: -fshort-wchar, -fno-short-wchar 2115 2116Force wchar\_t to be a short unsigned int 2117 2118.. option:: -fshow-column, -fno-show-column 2119 2120.. option:: -fshow-overloads=<arg> 2121 2122Which overload candidates to show when overload resolution fails: best\|all; defaults to all 2123 2124.. option:: -fshow-source-location, -fno-show-source-location 2125 2126.. option:: -fsignaling-math, -fno-signaling-math 2127 2128.. option:: -fsigned-bitfields 2129 2130.. option:: -fsigned-char, -fno-signed-char, --signed-char 2131 2132char is signed 2133 2134.. option:: -fsigned-zeros, -fno-signed-zeros 2135 2136.. option:: -fsized-deallocation, -fno-sized-deallocation 2137 2138Enable C++14 sized global deallocation functions 2139 2140.. option:: -fsjlj-exceptions 2141 2142Use SjLj style exceptions 2143 2144.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 2145 2146Enable the superword-level parallelism vectorization passes 2147 2148.. option:: -fspell-checking, -fno-spell-checking 2149 2150.. option:: -fspell-checking-limit=<arg> 2151 2152.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 2153 2154Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 2155 2156.. option:: -fsplit-lto-unit, -fno-split-lto-unit 2157 2158Enables splitting of the LTO unit 2159 2160.. option:: -fsplit-machine-functions, -fno-split-machine-functions 2161 2162Enable late function splitting using profile information (x86 ELF) 2163 2164.. option:: -fsplit-stack 2165 2166.. option:: -fstack-clash-protection, -fno-stack-clash-protection 2167 2168Enable stack clash protection 2169 2170.. option:: -fstack-protector, -fno-stack-protector 2171 2172Enable stack protectors for some functions vulnerable to stack smashing. This uses a loose heuristic which considers functions vulnerable if they contain a char (or 8bit integer) array or constant sized calls to alloca , which are of greater size than ssp-buffer-size (default: 8 bytes). All variable sized calls to alloca are considered vulnerable. A function with a stack protector has a guard value added to the stack frame that is checked on function exit. The guard value must be positioned in the stack frame such that a buffer overflow from a vulnerable variable will overwrite the guard value before overwriting the function's return address. The reference stack guard value is stored in a global variable. 2173 2174.. option:: -fstack-protector-all 2175 2176Enable stack protectors for all functions 2177 2178.. option:: -fstack-protector-strong 2179 2180Enable stack protectors for some functions vulnerable to stack smashing. Compared to -fstack-protector, this uses a stronger heuristic that includes functions containing arrays of any size (and any type), as well as any calls to alloca or the taking of an address from a local variable 2181 2182.. option:: -fstack-size-section, -fno-stack-size-section 2183 2184Emit section containing metadata on function stack sizes 2185 2186.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 2187 2188Emit full debug info for all types used by the program 2189 2190.. option:: -fstrict-aliasing, -fno-strict-aliasing 2191 2192.. option:: -fstrict-enums, -fno-strict-enums 2193 2194Enable optimizations based on the strict definition of an enum's value range 2195 2196.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 2197 2198Assume that overflowing float-to-int casts are undefined (default) 2199 2200.. option:: -fstrict-overflow, -fno-strict-overflow 2201 2202.. option:: -fstrict-return, -fno-strict-return 2203 2204.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 2205 2206Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 2207 2208.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 2209 2210.. option:: -fsymbol-partition=<arg> 2211 2212.. option:: -ftabstop=<arg> 2213 2214.. option:: -ftemplate-backtrace-limit=<arg> 2215 2216.. option:: -ftemplate-depth-<arg> 2217 2218.. option:: -ftemplate-depth=<arg> 2219 2220.. option:: -ftest-coverage, -fno-test-coverage 2221 2222.. option:: -fthin-link-bitcode=<arg> 2223 2224Write minimized bitcode to <file> for the ThinLTO thin link only 2225 2226.. option:: -fthinlto-index=<arg> 2227 2228Perform ThinLTO importing using provided function summary index 2229 2230.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 2231 2232.. option:: -ftime-report 2233 2234.. option:: -ftime-trace 2235 2236 2237Turn on time profiler. Generates JSON file based on output filename. Results 2238can be analyzed with chrome://tracing or `Speedscope App 2239<https://www.speedscope.app>`_ for flamegraph visualization. 2240 2241.. option:: -ftime-trace-granularity=<arg> 2242 2243Minimum time granularity (in microseconds) traced by time profiler 2244 2245.. option:: -ftls-model=<arg> 2246 2247.. option:: -ftrap-function=<arg> 2248 2249Issue call to specified function rather than a trap instruction 2250 2251.. option:: -ftrapping-math, -fno-trapping-math 2252 2253.. option:: -ftrapv 2254 2255Trap on integer overflow 2256 2257.. option:: -ftrapv-handler <arg> 2258 2259.. program:: clang1 2260.. option:: -ftrapv-handler=<function name> 2261.. program:: clang 2262 2263Specify the function to be called on overflow 2264 2265.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 2266 2267Process trigraph sequences 2268 2269.. option:: -ftrivial-auto-var-init-stop-after=<arg> 2270 2271Stop initializing trivial automatic stack variables after the specified number of instances 2272 2273.. option:: -ftrivial-auto-var-init=<arg> 2274 2275Initialize trivial automatic stack variables: uninitialized (default) \| pattern 2276 2277.. option:: -funique-basic-block-section-names, -fno-unique-basic-block-section-names 2278 2279Use unique names for basic block sections (ELF Only) 2280 2281.. option:: -funique-internal-linkage-names, -fno-unique-internal-linkage-names 2282 2283Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path 2284 2285.. option:: -funique-section-names, -fno-unique-section-names 2286 2287.. option:: -funit-at-a-time, -fno-unit-at-a-time 2288 2289.. option:: -funroll-loops, -fno-unroll-loops 2290 2291Turn on loop unroller 2292 2293.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 2294 2295.. option:: -funsigned-bitfields 2296 2297.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 2298 2299.. option:: -funwind-tables, -fno-unwind-tables 2300 2301.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 2302 2303.. option:: -fuse-init-array, -fno-use-init-array 2304 2305.. option:: -fuse-ld=<arg> 2306 2307.. option:: -fuse-line-directives, -fno-use-line-directives 2308 2309Use #line in preprocessed output 2310 2311.. option:: -fvalidate-ast-input-files-content 2312 2313Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are considered valid if both contents is identical 2314 2315.. option:: -fveclib=<arg> 2316 2317Use the given vector functions library 2318 2319.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2320 2321Enable the loop vectorization passes 2322 2323.. option:: -fverbose-asm, -dA, -fno-verbose-asm 2324 2325Generate verbose assembly output 2326 2327.. option:: -fvirtual-function-elimination, -fno-virtual-function-elimination 2328 2329Enables dead virtual function elimination optimization. Requires -flto=full 2330 2331.. option:: -fvisibility-global-new-delete-hidden 2332 2333Give global C++ operator new and delete declarations hidden visibility 2334 2335.. option:: -fvisibility-inlines-hidden 2336 2337Give inline C++ member functions hidden visibility by default 2338 2339.. option:: -fvisibility-inlines-hidden-static-local-var, -fno-visibility-inlines-hidden-static-local-var 2340 2341When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default 2342 2343.. option:: -fvisibility-ms-compat 2344 2345Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2346 2347.. option:: -fvisibility=<arg> 2348 2349Set the default symbol visibility for all global declarations 2350 2351.. option:: -fwasm-exceptions 2352 2353Use WebAssembly style exceptions 2354 2355.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2356 2357Enables whole-program vtable optimization. Requires -flto 2358 2359.. option:: -fwrapv, -fno-wrapv 2360 2361Treat signed integer overflow as two's complement 2362 2363.. option:: -fwritable-strings 2364 2365Store string literals as writable data 2366 2367.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2368 2369Always emit \_\_xray\_customevent(...) calls even if the containing function is not always instrumented 2370 2371.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2372 2373Always emit \_\_xray\_typedevent(...) calls even if the containing function is not always instrumented 2374 2375.. option:: -fxray-always-instrument=<arg> 2376 2377DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2378 2379.. option:: -fxray-attr-list=<arg> 2380 2381Filename defining the list of functions/types for imbuing XRay attributes. 2382 2383.. option:: -fxray-function-groups=<arg> 2384 2385Only instrument 1 of N groups 2386 2387.. option:: -fxray-function-index, -fno-xray-function-index 2388 2389.. option:: -fxray-ignore-loops, -fno-xray-ignore-loops 2390 2391Don't instrument functions with loops unless they also meet the minimum function size 2392 2393.. option:: -fxray-instruction-threshold<arg> 2394 2395.. program:: clang1 2396.. option:: -fxray-instruction-threshold=<arg> 2397.. program:: clang 2398 2399Sets the minimum function size to instrument with XRay 2400 2401.. option:: -fxray-instrument, -fno-xray-instrument 2402 2403Generate XRay instrumentation sleds on function entry and exit 2404 2405.. option:: -fxray-instrumentation-bundle=<arg> 2406 2407Select which XRay instrumentation points to emit. Options: all, none, function-entry, function-exit, function, custom. Default is 'all'. 'function' includes both 'function-entry' and 'function-exit'. 2408 2409.. option:: -fxray-link-deps 2410 2411Tells clang to add the link dependencies for XRay. 2412 2413.. option:: -fxray-modes=<arg> 2414 2415List of modes to link in by default into XRay instrumented binaries. 2416 2417.. option:: -fxray-never-instrument=<arg> 2418 2419DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2420 2421.. option:: -fxray-selected-function-group=<arg> 2422 2423When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1 2424 2425.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2426 2427.. option:: -fzvector, -fno-zvector, -mzvector 2428 2429Enable System z vector language extension 2430 2431.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2432 2433.. option:: -pedantic-errors, --pedantic-errors 2434 2435OpenCL flags 2436------------ 2437.. option:: -cl-denorms-are-zero 2438 2439OpenCL only. Allow denormals to be flushed to zero. 2440 2441.. option:: -cl-fast-relaxed-math 2442 2443OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2444 2445.. option:: -cl-finite-math-only 2446 2447OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2448 2449.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2450 2451OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2452 2453.. option:: -cl-kernel-arg-info 2454 2455OpenCL only. Generate kernel argument metadata. 2456 2457.. option:: -cl-mad-enable 2458 2459OpenCL only. Allow use of less precise MAD computations in the generated binary. 2460 2461.. option:: -cl-no-signed-zeros 2462 2463OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2464 2465.. option:: -cl-opt-disable 2466 2467OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2468 2469.. option:: -cl-single-precision-constant 2470 2471OpenCL only. Treat double precision floating-point constant as single precision constant. 2472 2473.. option:: -cl-std=<arg> 2474 2475OpenCL language standard to compile for. 2476 2477.. option:: -cl-strict-aliasing 2478 2479OpenCL only. This option is added for compatibility with OpenCL 1.0. 2480 2481.. option:: -cl-uniform-work-group-size 2482 2483OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2484 2485.. option:: -cl-unsafe-math-optimizations 2486 2487OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2488 2489SYCL flags 2490---------- 2491.. option:: -fsycl, -fno-sycl 2492 2493Enable SYCL kernels compilation for device 2494 2495.. option:: -sycl-std=<arg> 2496 2497SYCL language standard to compile for. 2498 2499Target-dependent compilation options 2500~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2501.. option:: -G<size>, -G=<arg>, -msmall-data-limit=<arg>, -msmall-data-threshold=<arg> 2502 2503Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2504 2505.. option:: -ffixed-x1 2506 2507Reserve the x1 register (AArch64/RISC-V only) 2508 2509.. option:: -ffixed-x10 2510 2511Reserve the x10 register (AArch64/RISC-V only) 2512 2513.. option:: -ffixed-x11 2514 2515Reserve the x11 register (AArch64/RISC-V only) 2516 2517.. option:: -ffixed-x12 2518 2519Reserve the x12 register (AArch64/RISC-V only) 2520 2521.. option:: -ffixed-x13 2522 2523Reserve the x13 register (AArch64/RISC-V only) 2524 2525.. option:: -ffixed-x14 2526 2527Reserve the x14 register (AArch64/RISC-V only) 2528 2529.. option:: -ffixed-x15 2530 2531Reserve the x15 register (AArch64/RISC-V only) 2532 2533.. option:: -ffixed-x16 2534 2535Reserve the x16 register (AArch64/RISC-V only) 2536 2537.. option:: -ffixed-x17 2538 2539Reserve the x17 register (AArch64/RISC-V only) 2540 2541.. option:: -ffixed-x18 2542 2543Reserve the x18 register (AArch64/RISC-V only) 2544 2545.. option:: -ffixed-x19 2546 2547Reserve the x19 register (AArch64/RISC-V only) 2548 2549.. option:: -ffixed-x2 2550 2551Reserve the x2 register (AArch64/RISC-V only) 2552 2553.. option:: -ffixed-x20 2554 2555Reserve the x20 register (AArch64/RISC-V only) 2556 2557.. option:: -ffixed-x21 2558 2559Reserve the x21 register (AArch64/RISC-V only) 2560 2561.. option:: -ffixed-x22 2562 2563Reserve the x22 register (AArch64/RISC-V only) 2564 2565.. option:: -ffixed-x23 2566 2567Reserve the x23 register (AArch64/RISC-V only) 2568 2569.. option:: -ffixed-x24 2570 2571Reserve the x24 register (AArch64/RISC-V only) 2572 2573.. option:: -ffixed-x25 2574 2575Reserve the x25 register (AArch64/RISC-V only) 2576 2577.. option:: -ffixed-x26 2578 2579Reserve the x26 register (AArch64/RISC-V only) 2580 2581.. option:: -ffixed-x27 2582 2583Reserve the x27 register (AArch64/RISC-V only) 2584 2585.. option:: -ffixed-x28 2586 2587Reserve the x28 register (AArch64/RISC-V only) 2588 2589.. option:: -ffixed-x29 2590 2591Reserve the x29 register (AArch64/RISC-V only) 2592 2593.. option:: -ffixed-x3 2594 2595Reserve the x3 register (AArch64/RISC-V only) 2596 2597.. option:: -ffixed-x30 2598 2599Reserve the x30 register (AArch64/RISC-V only) 2600 2601.. option:: -ffixed-x31 2602 2603Reserve the x31 register (AArch64/RISC-V only) 2604 2605.. option:: -ffixed-x4 2606 2607Reserve the x4 register (AArch64/RISC-V only) 2608 2609.. option:: -ffixed-x5 2610 2611Reserve the x5 register (AArch64/RISC-V only) 2612 2613.. option:: -ffixed-x6 2614 2615Reserve the x6 register (AArch64/RISC-V only) 2616 2617.. option:: -ffixed-x7 2618 2619Reserve the x7 register (AArch64/RISC-V only) 2620 2621.. option:: -ffixed-x8 2622 2623Reserve the x8 register (AArch64/RISC-V only) 2624 2625.. option:: -ffixed-x9 2626 2627Reserve the x9 register (AArch64/RISC-V only) 2628 2629.. option:: -m16 2630 2631.. option:: -m32 2632 2633.. option:: -m64 2634 2635.. option:: -mabi=<arg> 2636 2637.. option:: -maix-struct-return 2638 2639Return all structs in memory (PPC32 only) 2640 2641.. option:: -malign-branch-boundary=<arg> 2642 2643Specify the boundary's size to align branches 2644 2645.. option:: -malign-branch=<arg1>,<arg2>... 2646 2647Specify types of branches to align 2648 2649.. option:: -malign-double 2650 2651Align doubles to two words in structs (x86 only) 2652 2653.. option:: -march=<arg> 2654 2655.. option:: -masm=<arg> 2656 2657.. option:: -mbackchain, -mno-backchain 2658 2659Link stack frames through backchain on System Z 2660 2661.. option:: -mbranches-within-32B-boundaries 2662 2663Align selected branches (fused, jcc, jmp) within 32-byte boundary 2664 2665.. option:: -mcmodel=<arg>, -mcmodel=medany (equivalent to -mcmodel=medium), -mcmodel=medlow (equivalent to -mcmodel=small) 2666 2667.. option:: -mcode-object-v3, -mno-code-object-v3 2668 2669Legacy option to specify code object ABI V2 (-mnocode-object-v3) or V3 (-mcode-object-v3) (AMDGPU only) 2670 2671.. option:: -mcode-object-version=<version> 2672 2673Specify code object ABI version. Defaults to 4. (AMDGPU only) 2674 2675.. option:: -mconsole<arg> 2676 2677.. program:: clang1 2678.. option:: -mcpu=<arg>, -mv5 (equivalent to -mcpu=hexagonv5), -mv55 (equivalent to -mcpu=hexagonv55), -mv60 (equivalent to -mcpu=hexagonv60), -mv62 (equivalent to -mcpu=hexagonv62), -mv65 (equivalent to -mcpu=hexagonv65), -mv66 (equivalent to -mcpu=hexagonv66), -mv67 (equivalent to -mcpu=hexagonv67), -mv67t (equivalent to -mcpu=hexagonv67t) 2679.. program:: clang 2680 2681.. option:: -mcrc, -mno-crc 2682 2683Allow use of CRC instructions (ARM/Mips only) 2684 2685.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2686 2687.. option:: -mdll<arg> 2688 2689.. option:: -mdouble=<arg> 2690 2691Force double to be 32 bits or 64 bits 2692 2693.. option:: -mdynamic-no-pic<arg> 2694 2695.. option:: -meabi <arg> 2696 2697Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2698 2699.. option:: -menable-experimental-extensions 2700 2701Enable use of experimental RISC-V extensions. 2702 2703.. option:: -mfentry 2704 2705Insert calls to fentry at function entry (x86/SystemZ only) 2706 2707.. option:: -mfloat-abi=<arg> 2708 2709.. option:: -mfpmath=<arg> 2710 2711.. option:: -mfpu=<arg> 2712 2713.. option:: -mglobal-merge, -mno-global-merge 2714 2715Enable merging of globals 2716 2717.. option:: -mhard-float 2718 2719.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2720 2721.. option:: -mhwmult=<arg> 2722 2723.. option:: -miamcu, -mno-iamcu 2724 2725Use Intel MCU ABI 2726 2727.. option:: -mignore-xcoff-visibility 2728 2729Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file 2730 2731.. option:: -mimplicit-float, -mno-implicit-float 2732 2733.. option:: -mimplicit-it=<arg> 2734 2735.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2736 2737(integrated-as) Emit an object file which can be used with an incremental linker 2738 2739.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2740 2741.. option:: -mkernel 2742 2743.. option:: -mlong-calls, -mno-long-calls 2744 2745Generate branches with extended addressability, usually via indirect jumps. 2746 2747.. option:: -mlvi-cfi, -mno-lvi-cfi 2748 2749Enable only control-flow mitigations for Load Value Injection (LVI) 2750 2751.. option:: -mlvi-hardening, -mno-lvi-hardening 2752 2753Enable all mitigations for Load Value Injection (LVI) 2754 2755.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2756 2757Set Mac OS X deployment target 2758 2759.. option:: -mmcu=<arg> 2760 2761.. option:: -mms-bitfields, -mno-ms-bitfields 2762 2763Set the default structure layout to be compatible with the Microsoft compiler standard 2764 2765.. option:: -mnop-mcount 2766 2767Generate mcount/\_\_fentry\_\_ calls as nops. To activate they need to be patched in. 2768 2769.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2770 2771Omit frame pointer setup for leaf functions 2772 2773.. option:: -moslib=<arg> 2774 2775.. option:: -mpacked-stack, -mno-packed-stack 2776 2777Use packed stack layout (SystemZ only). 2778 2779.. option:: -mpad-max-prefix-size=<arg> 2780 2781Specify maximum number of prefixes to use for padding 2782 2783.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2784 2785Use copy relocations support for PIE builds 2786 2787.. option:: -mprefer-vector-width=<arg> 2788 2789Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2790 2791.. option:: -mqdsp6-compat 2792 2793Enable hexagon-qdsp6 backward compatibility 2794 2795.. option:: -mrecip 2796 2797.. program:: clang1 2798.. option:: -mrecip=<arg1>,<arg2>... 2799.. program:: clang 2800 2801.. option:: -mrecord-mcount 2802 2803Generate a \_\_mcount\_loc section entry for each \_\_fentry\_\_ call. 2804 2805.. option:: -mred-zone, -mno-red-zone 2806 2807.. option:: -mregparm=<arg> 2808 2809.. option:: -mrelax, -mno-relax 2810 2811Enable linker relaxation 2812 2813.. option:: -mrelax-all, -mno-relax-all 2814 2815(integrated-as) Relax all machine instructions 2816 2817.. option:: -mretpoline, -mno-retpoline 2818 2819.. option:: -mrtd, -mno-rtd 2820 2821Make StdCall calling convention the default 2822 2823.. option:: -mseses, -mno-seses 2824 2825Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations 2826 2827.. option:: -msign-return-address=<arg> 2828 2829Select return address signing scope 2830 2831.. option:: -msim 2832 2833.. option:: -msoft-float, -mno-soft-float 2834 2835Use software floating point 2836 2837.. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening 2838 2839.. option:: -mstack-alignment=<arg> 2840 2841Set the stack alignment 2842 2843.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2844 2845Enable stack probes 2846 2847.. option:: -mstack-probe-size=<arg> 2848 2849Set the stack probe size 2850 2851.. option:: -mstack-protector-guard-offset=<arg> 2852 2853Use the given offset for addressing the stack-protector guard 2854 2855.. option:: -mstack-protector-guard-reg=<arg> 2856 2857Use the given reg for addressing the stack-protector guard 2858 2859.. option:: -mstack-protector-guard=<arg> 2860 2861Use the given guard (global, tls) for addressing the stack-protector guard 2862 2863.. option:: -mstackrealign, -mno-stackrealign 2864 2865Force realign the stack at entry to every function 2866 2867.. option:: -msvr4-struct-return 2868 2869Return small structs in registers (PPC32 only) 2870 2871.. option:: -mthread-model <arg> 2872 2873The thread model to use, e.g. posix, single (posix by default) 2874 2875.. option:: -mthreads<arg> 2876 2877.. option:: -mthumb, -mno-thumb 2878 2879.. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs 2880 2881Enable direct TLS access through segment registers (default) 2882 2883.. option:: -mtls-size=<arg> 2884 2885Specify bit size of immediate TLS offsets (AArch64 ELF only): 12 (for 4KB) \| 24 (for 16MB, default) \| 32 (for 4GB) \| 48 (for 256TB, needs -mcmodel=large) 2886 2887.. program:: clang1 2888.. option:: -mtune=<arg> 2889.. program:: clang 2890 2891Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC. 2892 2893.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2894 2895.. option:: -municode<arg> 2896 2897.. option:: -mabi=vec-extabi, -mabi=vec-default 2898 2899Only supported on AIX. Specify usage of the extended vector ABI on AIX and of non-volatile vector registers. Defaults to '-mabi=default' when Altivec is enabled. 2900 2901.. option:: -mvx, -mno-vx 2902 2903.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2904 2905.. option:: -mwatchos-version-min=<arg> 2906 2907.. option:: -mwavefrontsize64, -mno-wavefrontsize64 2908 2909Specify wavefront size 64 mode (AMDGPU only) 2910 2911.. option:: -mwindows<arg> 2912 2913.. option:: -mx32 2914 2915AARCH64 2916------- 2917.. option:: -fcall-saved-x10 2918 2919Make the x10 register call-saved (AArch64 only) 2920 2921.. option:: -fcall-saved-x11 2922 2923Make the x11 register call-saved (AArch64 only) 2924 2925.. option:: -fcall-saved-x12 2926 2927Make the x12 register call-saved (AArch64 only) 2928 2929.. option:: -fcall-saved-x13 2930 2931Make the x13 register call-saved (AArch64 only) 2932 2933.. option:: -fcall-saved-x14 2934 2935Make the x14 register call-saved (AArch64 only) 2936 2937.. option:: -fcall-saved-x15 2938 2939Make the x15 register call-saved (AArch64 only) 2940 2941.. option:: -fcall-saved-x18 2942 2943Make the x18 register call-saved (AArch64 only) 2944 2945.. option:: -fcall-saved-x8 2946 2947Make the x8 register call-saved (AArch64 only) 2948 2949.. option:: -fcall-saved-x9 2950 2951Make the x9 register call-saved (AArch64 only) 2952 2953.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2954 2955Workaround Cortex-A53 erratum 835769 (AArch64 only) 2956 2957.. option:: -mgeneral-regs-only 2958 2959Generate code which only uses the general purpose registers (AArch64 only) 2960 2961.. option:: -mmark-bti-property 2962 2963Add .note.gnu.property with BTI to assembly files (AArch64 only) 2964 2965.. option:: -msve-vector-bits=<arg> 2966 2967Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only) 2968 2969AMDGPU 2970------ 2971.. option:: -mcumode, -mno-cumode 2972 2973Specify CU (-mcumode) or WGP (-mno-cumode) wavefront execution mode (AMDGPU only) 2974 2975.. option:: -msram-ecc, -mno-sram-ecc 2976 2977Specify SRAM ECC mode (AMDGPU only) 2978 2979.. option:: -mxnack, -mno-xnack 2980 2981Specify XNACK mode (AMDGPU only) 2982 2983ARM 2984--- 2985.. option:: -faapcs-bitfield-load 2986 2987Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only). 2988 2989.. option:: -faapcs-bitfield-width, -fno-aapcs-bitfield-width 2990 2991Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only). 2992 2993.. option:: -ffixed-r9 2994 2995Reserve the r9 register (ARM only) 2996 2997.. option:: -mcmse 2998 2999Allow use of CMSE (Armv8-M Security Extensions) 3000 3001.. option:: -mexecute-only, -mno-execute-only, -mpure-code 3002 3003Disallow generation of data access to code sections (ARM only) 3004 3005.. option:: -mno-movt 3006 3007Disallow use of movt/movw pairs (ARM only) 3008 3009.. option:: -mno-neg-immediates 3010 3011Disallow converting instructions with negative immediates to their negation or inversion. 3012 3013.. option:: -mnocrc 3014 3015Disallow use of CRC instructions (ARM only) 3016 3017.. option:: -mrestrict-it, -mno-restrict-it 3018 3019Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 3020 3021.. option:: -mtp=<arg> 3022 3023Thread pointer access method (AArch32/AArch64 only) 3024 3025.. option:: -munaligned-access, -mno-unaligned-access 3026 3027Allow memory accesses to be unaligned (AArch32/AArch64 only) 3028 3029Hexagon 3030------- 3031.. option:: -mieee-rnd-near 3032 3033.. option:: -mmemops, -mno-memops 3034 3035Enable generation of memop instructions 3036 3037.. option:: -mnvj, -mno-nvj 3038 3039Enable generation of new-value jumps 3040 3041.. option:: -mnvs, -mno-nvs 3042 3043Enable generation of new-value stores 3044 3045.. option:: -mpackets, -mno-packets 3046 3047Enable generation of instruction packets 3048 3049Hexagon 3050------- 3051.. option:: -mhvx, -mno-hvx 3052 3053Enable Hexagon Vector eXtensions 3054 3055.. option:: -mhvx-length=<arg> 3056 3057Set Hexagon Vector Length 3058 3059.. program:: clang1 3060.. option:: -mhvx=<arg> 3061.. program:: clang 3062 3063Enable Hexagon Vector eXtensions 3064 3065MIPS 3066---- 3067.. option:: -mabicalls, -mno-abicalls 3068 3069Enable SVR4-style position-independent code (Mips only) 3070 3071.. option:: -mabs=<arg> 3072 3073.. option:: -mcheck-zero-division, -mno-check-zero-division 3074 3075.. option:: -mcompact-branches=<arg> 3076 3077.. option:: -mdouble-float 3078 3079.. option:: -mdsp, -mno-dsp 3080 3081.. option:: -mdspr2, -mno-dspr2 3082 3083.. option:: -membedded-data, -mno-embedded-data 3084 3085Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 3086 3087.. option:: -mextern-sdata, -mno-extern-sdata 3088 3089Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 3090 3091.. option:: -mfp32 3092 3093Use 32-bit floating point registers (MIPS only) 3094 3095.. option:: -mfp64 3096 3097Use 64-bit floating point registers (MIPS only) 3098 3099.. option:: -mginv, -mno-ginv 3100 3101.. option:: -mgpopt, -mno-gpopt 3102 3103Use GP relative accesses for symbols known to be in a small data section (MIPS) 3104 3105.. option:: -mindirect-jump=<arg> 3106 3107Change indirect jump instructions to inhibit speculation 3108 3109.. option:: -mips16 3110 3111.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 3112 3113.. option:: -mlocal-sdata, -mno-local-sdata 3114 3115Extend the -G behaviour to object local data (MIPS) 3116 3117.. option:: -mmadd4, -mno-madd4 3118 3119Enable the generation of 4-operand madd.s, madd.d and related instructions. 3120 3121.. option:: -mmicromips, -mno-micromips 3122 3123.. option:: -mmsa, -mno-msa 3124 3125Enable MSA ASE (MIPS only) 3126 3127.. option:: -mmt, -mno-mt 3128 3129Enable MT ASE (MIPS only) 3130 3131.. option:: -mnan=<arg> 3132 3133.. option:: -mno-mips16 3134 3135.. option:: -msingle-float 3136 3137.. option:: -mvirt, -mno-virt 3138 3139.. option:: -mxgot, -mno-xgot 3140 3141PowerPC 3142------- 3143.. option:: -maltivec, -mno-altivec 3144 3145.. option:: -mcmpb, -mno-cmpb 3146 3147.. option:: -mcrbits, -mno-crbits 3148 3149.. option:: -mcrypto, -mno-crypto 3150 3151.. option:: -mdirect-move, -mno-direct-move 3152 3153.. option:: -mefpu2 3154 3155.. option:: -mfloat128, -mno-float128 3156 3157.. option:: -mfprnd, -mno-fprnd 3158 3159.. option:: -mhtm, -mno-htm 3160 3161.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 3162 3163.. option:: -misel, -mno-isel 3164 3165.. option:: -mlongcall, -mno-longcall 3166 3167.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 3168 3169.. option:: -mmma, -mno-mma 3170 3171.. option:: -mpaired-vector-memops, -mno-paired-vector-memops 3172 3173.. option:: -mpcrel, -mno-pcrel 3174 3175.. option:: -mpopcntd, -mno-popcntd 3176 3177.. option:: -mpower10-vector, -mno-power10-vector 3178 3179.. option:: -mpower8-vector, -mno-power8-vector 3180 3181.. option:: -mpower9-vector, -mno-power9-vector 3182 3183.. option:: -msecure-plt 3184 3185.. option:: -mspe, -mno-spe 3186 3187.. option:: -mvsx, -mno-vsx 3188 3189WebAssembly 3190----------- 3191.. option:: -matomics, -mno-atomics 3192 3193.. option:: -mbulk-memory, -mno-bulk-memory 3194 3195.. option:: -mexception-handling, -mno-exception-handling 3196 3197.. option:: -mmultivalue, -mno-multivalue 3198 3199.. option:: -mmutable-globals, -mno-mutable-globals 3200 3201.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 3202 3203.. option:: -mreference-types, -mno-reference-types 3204 3205.. option:: -msign-ext, -mno-sign-ext 3206 3207.. option:: -msimd128, -mno-simd128 3208 3209.. option:: -mtail-call, -mno-tail-call 3210 3211.. option:: -munimplemented-simd128, -mno-unimplemented-simd128 3212 3213WebAssembly Driver 3214------------------ 3215.. option:: -mexec-model=<arg> 3216 3217Execution model (WebAssembly only) 3218 3219X86 3220--- 3221.. option:: -m3dnow, -mno-3dnow 3222 3223.. option:: -m3dnowa, -mno-3dnowa 3224 3225.. option:: -madx, -mno-adx 3226 3227.. option:: -maes, -mno-aes 3228 3229.. option:: -mamx-bf16, -mno-amx-bf16 3230 3231.. option:: -mamx-int8, -mno-amx-int8 3232 3233.. option:: -mamx-tile, -mno-amx-tile 3234 3235.. option:: -mavx, -mno-avx 3236 3237.. option:: -mavx2, -mno-avx2 3238 3239.. option:: -mavx512bf16, -mno-avx512bf16 3240 3241.. option:: -mavx512bitalg, -mno-avx512bitalg 3242 3243.. option:: -mavx512bw, -mno-avx512bw 3244 3245.. option:: -mavx512cd, -mno-avx512cd 3246 3247.. option:: -mavx512dq, -mno-avx512dq 3248 3249.. option:: -mavx512er, -mno-avx512er 3250 3251.. option:: -mavx512f, -mno-avx512f 3252 3253.. option:: -mavx512ifma, -mno-avx512ifma 3254 3255.. option:: -mavx512pf, -mno-avx512pf 3256 3257.. option:: -mavx512vbmi, -mno-avx512vbmi 3258 3259.. option:: -mavx512vbmi2, -mno-avx512vbmi2 3260 3261.. option:: -mavx512vl, -mno-avx512vl 3262 3263.. option:: -mavx512vnni, -mno-avx512vnni 3264 3265.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 3266 3267.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 3268 3269.. option:: -mavxvnni, -mno-avxvnni 3270 3271.. option:: -mbmi, -mno-bmi 3272 3273.. option:: -mbmi2, -mno-bmi2 3274 3275.. option:: -mcldemote, -mno-cldemote 3276 3277.. option:: -mclflushopt, -mno-clflushopt 3278 3279.. option:: -mclwb, -mno-clwb 3280 3281.. option:: -mclzero, -mno-clzero 3282 3283.. option:: -mcx16, -mno-cx16 3284 3285.. option:: -menqcmd, -mno-enqcmd 3286 3287.. option:: -mf16c, -mno-f16c 3288 3289.. option:: -mfma, -mno-fma 3290 3291.. option:: -mfma4, -mno-fma4 3292 3293.. option:: -mfsgsbase, -mno-fsgsbase 3294 3295.. option:: -mfxsr, -mno-fxsr 3296 3297.. option:: -mgfni, -mno-gfni 3298 3299.. option:: -mhreset, -mno-hreset 3300 3301.. option:: -minvpcid, -mno-invpcid 3302 3303.. option:: -mkl, -mno-kl 3304 3305.. option:: -mlwp, -mno-lwp 3306 3307.. option:: -mlzcnt, -mno-lzcnt 3308 3309.. option:: -mmmx, -mno-mmx 3310 3311.. option:: -mmovbe, -mno-movbe 3312 3313.. option:: -mmovdir64b, -mno-movdir64b 3314 3315.. option:: -mmovdiri, -mno-movdiri 3316 3317.. option:: -mmwaitx, -mno-mwaitx 3318 3319.. option:: -mpclmul, -mno-pclmul 3320 3321.. option:: -mpconfig, -mno-pconfig 3322 3323.. option:: -mpku, -mno-pku 3324 3325.. option:: -mpopcnt, -mno-popcnt 3326 3327.. option:: -mprefetchwt1, -mno-prefetchwt1 3328 3329.. option:: -mprfchw, -mno-prfchw 3330 3331.. option:: -mptwrite, -mno-ptwrite 3332 3333.. option:: -mrdpid, -mno-rdpid 3334 3335.. option:: -mrdrnd, -mno-rdrnd 3336 3337.. option:: -mrdseed, -mno-rdseed 3338 3339.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 3340 3341.. option:: -mrtm, -mno-rtm 3342 3343.. option:: -msahf, -mno-sahf 3344 3345.. option:: -mserialize, -mno-serialize 3346 3347.. option:: -msgx, -mno-sgx 3348 3349.. option:: -msha, -mno-sha 3350 3351.. option:: -mshstk, -mno-shstk 3352 3353.. option:: -msse, -mno-sse 3354 3355.. option:: -msse2, -mno-sse2 3356 3357.. option:: -msse3, -mno-sse3 3358 3359.. option:: -msse4.1, -mno-sse4.1 3360 3361.. program:: clang1 3362.. option:: -msse4.2, -mno-sse4.2, -msse4 3363.. program:: clang 3364 3365.. option:: -msse4a, -mno-sse4a 3366 3367.. option:: -mssse3, -mno-ssse3 3368 3369.. option:: -mtbm, -mno-tbm 3370 3371.. option:: -mtsxldtrk, -mno-tsxldtrk 3372 3373.. option:: -muintr, -mno-uintr 3374 3375.. option:: -mvaes, -mno-vaes 3376 3377.. option:: -mvpclmulqdq, -mno-vpclmulqdq 3378 3379.. option:: -mvzeroupper, -mno-vzeroupper 3380 3381.. option:: -mwaitpkg, -mno-waitpkg 3382 3383.. option:: -mwbnoinvd, -mno-wbnoinvd 3384 3385.. option:: -mwidekl, -mno-widekl 3386 3387.. option:: -mx87, -m80387, -mno-x87 3388 3389.. option:: -mxop, -mno-xop 3390 3391.. option:: -mxsave, -mno-xsave 3392 3393.. option:: -mxsavec, -mno-xsavec 3394 3395.. option:: -mxsaveopt, -mno-xsaveopt 3396 3397.. option:: -mxsaves, -mno-xsaves 3398 3399RISCV 3400----- 3401.. option:: -msave-restore, -mno-save-restore 3402 3403Enable using library calls for save and restore 3404 3405Long double flags 3406----------------- 3407Selects the long double implementation 3408 3409.. option:: -mlong-double-128 3410 3411Force long double to be 128 bits 3412 3413.. option:: -mlong-double-64 3414 3415Force long double to be 64 bits 3416 3417.. option:: -mlong-double-80 3418 3419Force long double to be 80 bits, padded to 128 bits for storage 3420 3421Optimization level 3422~~~~~~~~~~~~~~~~~~ 3423 3424Flags controlling how much optimization should be performed. 3425 3426.. option:: -O<arg>, -O (equivalent to -O1), --optimize, --optimize=<arg> 3427 3428.. option:: -Ofast<arg> 3429 3430Debug information generation 3431~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3432 3433Flags controlling how much and what kind of debug information should be 3434generated. 3435 3436Kind and level of debug information 3437----------------------------------- 3438.. option:: -g, --debug, --debug=<arg> 3439 3440Generate source-level debug information 3441 3442.. option:: -gdwarf 3443 3444Generate source-level debug information with the default dwarf version 3445 3446.. option:: -gdwarf-2 3447 3448Generate source-level debug information with dwarf version 2 3449 3450.. option:: -gdwarf-3 3451 3452Generate source-level debug information with dwarf version 3 3453 3454.. option:: -gdwarf-4 3455 3456Generate source-level debug information with dwarf version 4 3457 3458.. option:: -gdwarf-5 3459 3460Generate source-level debug information with dwarf version 5 3461 3462.. option:: -gfull 3463 3464.. option:: -gused 3465 3466Debug level 3467___________ 3468.. option:: -g0 3469 3470.. option:: -g2 3471 3472.. option:: -g3 3473 3474.. option:: -ggdb0 3475 3476.. option:: -ggdb1 3477 3478.. option:: -ggdb2 3479 3480.. option:: -ggdb3 3481 3482.. option:: -gline-directives-only 3483 3484Emit debug line info directives only 3485 3486.. option:: -gline-tables-only, -g1, -gmlt 3487 3488Emit debug line number tables only 3489 3490.. option:: -gmodules 3491 3492Generate debug info with external references to clang modules or precompiled headers 3493 3494Debugger to tune debug information for 3495______________________________________ 3496.. option:: -ggdb 3497 3498.. option:: -glldb 3499 3500.. option:: -gsce 3501 3502Debug information flags 3503----------------------- 3504.. option:: -gcolumn-info, -gno-column-info 3505 3506.. option:: -gdwarf-aranges 3507 3508.. option:: -gembed-source, -gno-embed-source 3509 3510Embed source text in DWARF debug sections 3511 3512.. option:: -ggnu-pubnames, -gno-gnu-pubnames 3513 3514.. option:: -gpubnames, -gno-pubnames 3515 3516.. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches 3517 3518.. option:: -gsplit-dwarf 3519 3520.. program:: clang1 3521.. option:: -gsplit-dwarf=<arg> 3522.. program:: clang 3523 3524Set DWARF fission mode to either 'split' or 'single' 3525 3526.. option:: -gstrict-dwarf, -gno-strict-dwarf 3527 3528.. option:: -gz=<arg>, -gz (equivalent to -gz=zlib) 3529 3530DWARF debug sections compression type 3531 3532Static analyzer flags 3533===================== 3534 3535Flags controlling the behavior of the Clang Static Analyzer. 3536 3537.. option:: -Xanalyzer <arg> 3538 3539Pass <arg> to the static analyzer 3540 3541Fortran compilation flags 3542========================= 3543 3544Flags that will be passed onto the ``gfortran`` compiler when Clang is given 3545a Fortran input. 3546 3547.. option:: -A<arg>, --assert <arg>, --assert=<arg> 3548 3549.. option:: -A-<arg> 3550 3551.. option:: -J<arg> 3552 3553.. option:: -cpp 3554 3555.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 3556 3557.. option:: -falign-commons, -fno-align-commons 3558 3559.. option:: -fall-intrinsics, -fno-all-intrinsics 3560 3561.. option:: -fautomatic, -fno-automatic 3562 3563.. option:: -fbackslash, -fno-backslash 3564 3565.. option:: -fbacktrace, -fno-backtrace 3566 3567.. option:: -fblas-matmul-limit=<arg> 3568 3569.. option:: -fbounds-check, -fno-bounds-check 3570 3571.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 3572 3573.. option:: -fcheck=<arg> 3574 3575.. option:: -fcoarray=<arg> 3576 3577.. option:: -fconvert=<arg> 3578 3579.. option:: -fcray-pointer, -fno-cray-pointer 3580 3581.. option:: -fd-lines-as-code, -fno-d-lines-as-code 3582 3583.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 3584 3585.. option:: -fdefault-double-8, -fno-default-double-8 3586 3587.. option:: -fdefault-integer-8, -fno-default-integer-8 3588 3589.. option:: -fdefault-real-8, -fno-default-real-8 3590 3591.. option:: -fdollar-ok, -fno-dollar-ok 3592 3593.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 3594 3595.. option:: -fdump-fortran-original, -fno-dump-fortran-original 3596 3597.. option:: -fdump-parse-tree, -fno-dump-parse-tree 3598 3599.. option:: -fexternal-blas, -fno-external-blas 3600 3601.. option:: -ff2c, -fno-f2c 3602 3603.. option:: -ffixed-form, -fno-fixed-form 3604 3605.. option:: -ffixed-line-length-<arg> 3606 3607.. option:: -ffpe-trap=<arg> 3608 3609.. option:: -ffree-form, -fno-free-form 3610 3611.. option:: -ffree-line-length-<arg> 3612 3613.. option:: -ffrontend-optimize, -fno-frontend-optimize 3614 3615.. option:: -fimplicit-none, -fno-implicit-none 3616 3617.. option:: -finit-character=<arg> 3618 3619.. option:: -finit-integer=<arg> 3620 3621.. option:: -finit-local-zero, -fno-init-local-zero 3622 3623.. option:: -finit-logical=<arg> 3624 3625.. option:: -finit-real=<arg> 3626 3627.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 3628 3629.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 3630 3631.. option:: -fmax-array-constructor=<arg> 3632 3633.. option:: -fmax-errors=<arg> 3634 3635.. option:: -fmax-identifier-length, -fno-max-identifier-length 3636 3637.. option:: -fmax-stack-var-size=<arg> 3638 3639.. option:: -fmax-subrecord-length=<arg> 3640 3641.. option:: -fmodule-private, -fno-module-private 3642 3643.. option:: -fpack-derived, -fno-pack-derived 3644 3645.. option:: -fprotect-parens, -fno-protect-parens 3646 3647.. option:: -frange-check, -fno-range-check 3648 3649.. option:: -freal-4-real-10, -fno-real-4-real-10 3650 3651.. option:: -freal-4-real-16, -fno-real-4-real-16 3652 3653.. option:: -freal-4-real-8, -fno-real-4-real-8 3654 3655.. option:: -freal-8-real-10, -fno-real-8-real-10 3656 3657.. option:: -freal-8-real-16, -fno-real-8-real-16 3658 3659.. option:: -freal-8-real-4, -fno-real-8-real-4 3660 3661.. option:: -frealloc-lhs, -fno-realloc-lhs 3662 3663.. option:: -frecord-marker=<arg> 3664 3665.. option:: -frecursive, -fno-recursive 3666 3667.. option:: -frepack-arrays, -fno-repack-arrays 3668 3669.. option:: -fsecond-underscore, -fno-second-underscore 3670 3671.. option:: -fsign-zero, -fno-sign-zero 3672 3673.. option:: -fstack-arrays, -fno-stack-arrays 3674 3675.. option:: -funderscoring, -fno-underscoring 3676 3677.. option:: -fwhole-file, -fno-whole-file 3678 3679.. option:: -imultilib <arg> 3680 3681.. option:: -nocpp 3682 3683.. option:: -static-libgfortran 3684 3685Linker flags 3686============ 3687Flags that are passed on to the linker 3688 3689.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3690 3691Add directory to library search path 3692 3693.. option:: -Mach 3694 3695.. option:: -T<script> 3696 3697Specify <script> as linker script 3698 3699.. option:: -Tbss<addr> 3700 3701Set starting address of BSS to <addr> 3702 3703.. option:: -Tdata<addr> 3704 3705Set starting address of DATA to <addr> 3706 3707.. option:: -Ttext<addr> 3708 3709Set starting address of TEXT to <addr> 3710 3711.. option:: -Wl,<arg>,<arg2>... 3712 3713Pass the comma separated arguments in <arg> to the linker 3714 3715.. option:: -X 3716 3717.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3718 3719Pass <arg> to the linker 3720 3721.. program:: clang1 3722.. option:: -Z 3723.. program:: clang 3724 3725.. option:: -coverage, --coverage 3726 3727.. option:: -e<arg>, --entry 3728 3729.. option:: -filelist <arg> 3730 3731.. option:: --hip-device-lib=<arg> 3732 3733HIP device library 3734 3735.. option:: -l<arg> 3736 3737.. option:: --ld-path=<arg> 3738 3739.. option:: -nostartfiles 3740 3741.. program:: clang1 3742.. option:: -nostdlib, --no-standard-libraries 3743.. program:: clang 3744 3745.. option:: -pie 3746 3747.. option:: -r 3748 3749.. option:: -rdynamic 3750 3751.. option:: --rocm-device-lib-path=<arg>, --hip-device-lib-path=<arg> 3752 3753ROCm device library path. Alternative to rocm-path. 3754 3755.. option:: -rpath <arg> 3756 3757.. option:: -s 3758 3759.. option:: -shared, --shared 3760 3761.. option:: -specs=<arg>, --specs=<arg> 3762 3763.. option:: -static, --static 3764 3765.. option:: -static-pie 3766 3767.. option:: -t 3768 3769.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3770 3771.. option:: -undef 3772 3773undef all system defines 3774 3775.. option:: -undefined<arg>, --no-undefined 3776 3777.. option:: -z <arg> 3778 3779Pass -z <arg> to the linker 3780 3781