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-bc-path=<arg> 1147 1148Path to libomptarget-nvptx bitcode library 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.. program:: clang1 2049.. option:: -fprofile-list=<file> 2050.. program:: clang 2051 2052Filename defining the list of functions/files to instrument. The file uses the sanitizer special case list format. 2053 2054.. option:: -freciprocal-math, -fno-reciprocal-math 2055 2056Allow division operations to be reassociated 2057 2058.. option:: -freg-struct-return 2059 2060Override the default ABI to return small structs in registers 2061 2062.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 2063 2064Use atexit or \_\_cxa\_atexit to register global destructors 2065 2066.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 2067 2068Enable C++17 relaxed template template argument matching 2069 2070.. option:: -freroll-loops, -fno-reroll-loops 2071 2072Turn on loop reroller 2073 2074.. option:: -fretain-comments-from-system-headers 2075 2076.. option:: -frewrite-imports, -fno-rewrite-imports 2077 2078.. option:: -frewrite-includes, -fno-rewrite-includes 2079 2080.. option:: -frewrite-map-file <arg> 2081 2082.. program:: clang1 2083.. option:: -frewrite-map-file=<arg> 2084.. program:: clang 2085 2086.. option:: -fropi, -fno-ropi 2087 2088Generate read-only position independent code (ARM only) 2089 2090.. option:: -frounding-math, -fno-rounding-math 2091 2092.. option:: -frtti, -fno-rtti 2093 2094.. option:: -frtti-data, -fno-rtti-data 2095 2096.. option:: -frwpi, -fno-rwpi 2097 2098Generate read-write position independent code (ARM only) 2099 2100.. option:: -fsave-optimization-record, -fno-save-optimization-record 2101 2102Generate a YAML optimization record file 2103 2104.. program:: clang1 2105.. option:: -fsave-optimization-record=<format> 2106.. program:: clang 2107 2108Generate an optimization record file in a specific format 2109 2110.. option:: -fseh-exceptions 2111 2112Use SEH style exceptions 2113 2114.. option:: -fsemantic-interposition, -fno-semantic-interposition 2115 2116.. option:: -fshort-enums, -fno-short-enums 2117 2118Allocate to an enum type only as many bytes as it needs for the declared range of possible values 2119 2120.. option:: -fshort-wchar, -fno-short-wchar 2121 2122Force wchar\_t to be a short unsigned int 2123 2124.. option:: -fshow-column, -fno-show-column 2125 2126.. option:: -fshow-overloads=<arg> 2127 2128Which overload candidates to show when overload resolution fails: best\|all; defaults to all 2129 2130.. option:: -fshow-source-location, -fno-show-source-location 2131 2132.. option:: -fsignaling-math, -fno-signaling-math 2133 2134.. option:: -fsigned-bitfields 2135 2136.. option:: -fsigned-char, -fno-signed-char, --signed-char 2137 2138char is signed 2139 2140.. option:: -fsigned-zeros, -fno-signed-zeros 2141 2142.. option:: -fsized-deallocation, -fno-sized-deallocation 2143 2144Enable C++14 sized global deallocation functions 2145 2146.. option:: -fsjlj-exceptions 2147 2148Use SjLj style exceptions 2149 2150.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 2151 2152Enable the superword-level parallelism vectorization passes 2153 2154.. option:: -fspell-checking, -fno-spell-checking 2155 2156.. option:: -fspell-checking-limit=<arg> 2157 2158.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 2159 2160Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 2161 2162.. option:: -fsplit-lto-unit, -fno-split-lto-unit 2163 2164Enables splitting of the LTO unit 2165 2166.. option:: -fsplit-machine-functions, -fno-split-machine-functions 2167 2168Enable late function splitting using profile information (x86 ELF) 2169 2170.. option:: -fsplit-stack 2171 2172.. option:: -fstack-clash-protection, -fno-stack-clash-protection 2173 2174Enable stack clash protection 2175 2176.. option:: -fstack-protector, -fno-stack-protector 2177 2178Enable 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. 2179 2180.. option:: -fstack-protector-all 2181 2182Enable stack protectors for all functions 2183 2184.. option:: -fstack-protector-strong 2185 2186Enable 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 2187 2188.. option:: -fstack-size-section, -fno-stack-size-section 2189 2190Emit section containing metadata on function stack sizes 2191 2192.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 2193 2194Emit full debug info for all types used by the program 2195 2196.. option:: -fstrict-aliasing, -fno-strict-aliasing 2197 2198.. option:: -fstrict-enums, -fno-strict-enums 2199 2200Enable optimizations based on the strict definition of an enum's value range 2201 2202.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 2203 2204Assume that overflowing float-to-int casts are undefined (default) 2205 2206.. option:: -fstrict-overflow, -fno-strict-overflow 2207 2208.. option:: -fstrict-return, -fno-strict-return 2209 2210.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 2211 2212Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 2213 2214.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 2215 2216.. option:: -fsymbol-partition=<arg> 2217 2218.. option:: -ftabstop=<arg> 2219 2220.. option:: -ftemplate-backtrace-limit=<arg> 2221 2222.. option:: -ftemplate-depth-<arg> 2223 2224.. option:: -ftemplate-depth=<arg> 2225 2226.. option:: -ftest-coverage, -fno-test-coverage 2227 2228.. option:: -fthin-link-bitcode=<arg> 2229 2230Write minimized bitcode to <file> for the ThinLTO thin link only 2231 2232.. option:: -fthinlto-index=<arg> 2233 2234Perform ThinLTO importing using provided function summary index 2235 2236.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 2237 2238.. option:: -ftime-report 2239 2240.. option:: -ftime-trace 2241 2242 2243Turn on time profiler. Generates JSON file based on output filename. Results 2244can be analyzed with chrome://tracing or `Speedscope App 2245<https://www.speedscope.app>`_ for flamegraph visualization. 2246 2247.. option:: -ftime-trace-granularity=<arg> 2248 2249Minimum time granularity (in microseconds) traced by time profiler 2250 2251.. option:: -ftls-model=<arg> 2252 2253.. option:: -ftrap-function=<arg> 2254 2255Issue call to specified function rather than a trap instruction 2256 2257.. option:: -ftrapping-math, -fno-trapping-math 2258 2259.. option:: -ftrapv 2260 2261Trap on integer overflow 2262 2263.. option:: -ftrapv-handler <arg> 2264 2265.. program:: clang1 2266.. option:: -ftrapv-handler=<function name> 2267.. program:: clang 2268 2269Specify the function to be called on overflow 2270 2271.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 2272 2273Process trigraph sequences 2274 2275.. option:: -ftrivial-auto-var-init-stop-after=<arg> 2276 2277Stop initializing trivial automatic stack variables after the specified number of instances 2278 2279.. option:: -ftrivial-auto-var-init=<arg> 2280 2281Initialize trivial automatic stack variables: uninitialized (default) \| pattern 2282 2283.. option:: -funique-basic-block-section-names, -fno-unique-basic-block-section-names 2284 2285Use unique names for basic block sections (ELF Only) 2286 2287.. option:: -funique-internal-linkage-names, -fno-unique-internal-linkage-names 2288 2289Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path 2290 2291.. option:: -funique-section-names, -fno-unique-section-names 2292 2293.. option:: -funit-at-a-time, -fno-unit-at-a-time 2294 2295.. option:: -funroll-loops, -fno-unroll-loops 2296 2297Turn on loop unroller 2298 2299.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 2300 2301.. option:: -funsigned-bitfields 2302 2303.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 2304 2305.. option:: -funwind-tables, -fno-unwind-tables 2306 2307.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 2308 2309.. option:: -fuse-init-array, -fno-use-init-array 2310 2311.. option:: -fuse-ld=<arg> 2312 2313.. option:: -fuse-line-directives, -fno-use-line-directives 2314 2315Use #line in preprocessed output 2316 2317.. option:: -fvalidate-ast-input-files-content 2318 2319Compute 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 2320 2321.. option:: -fveclib=<arg> 2322 2323Use the given vector functions library 2324 2325.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2326 2327Enable the loop vectorization passes 2328 2329.. option:: -fverbose-asm, -dA, -fno-verbose-asm 2330 2331Generate verbose assembly output 2332 2333.. option:: -fvirtual-function-elimination, -fno-virtual-function-elimination 2334 2335Enables dead virtual function elimination optimization. Requires -flto=full 2336 2337.. option:: -fvisibility-global-new-delete-hidden 2338 2339Give global C++ operator new and delete declarations hidden visibility 2340 2341.. option:: -fvisibility-inlines-hidden 2342 2343Give inline C++ member functions hidden visibility by default 2344 2345.. option:: -fvisibility-inlines-hidden-static-local-var, -fno-visibility-inlines-hidden-static-local-var 2346 2347When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default 2348 2349.. option:: -fvisibility-ms-compat 2350 2351Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2352 2353.. option:: -fvisibility=<arg> 2354 2355Set the default symbol visibility for all global declarations 2356 2357.. option:: -fwasm-exceptions 2358 2359Use WebAssembly style exceptions 2360 2361.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2362 2363Enables whole-program vtable optimization. Requires -flto 2364 2365.. option:: -fwrapv, -fno-wrapv 2366 2367Treat signed integer overflow as two's complement 2368 2369.. option:: -fwritable-strings 2370 2371Store string literals as writable data 2372 2373.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2374 2375Always emit \_\_xray\_customevent(...) calls even if the containing function is not always instrumented 2376 2377.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2378 2379Always emit \_\_xray\_typedevent(...) calls even if the containing function is not always instrumented 2380 2381.. option:: -fxray-always-instrument=<arg> 2382 2383DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2384 2385.. option:: -fxray-attr-list=<arg> 2386 2387Filename defining the list of functions/types for imbuing XRay attributes. 2388 2389.. option:: -fxray-function-groups=<arg> 2390 2391Only instrument 1 of N groups 2392 2393.. option:: -fxray-function-index, -fno-xray-function-index 2394 2395.. option:: -fxray-ignore-loops, -fno-xray-ignore-loops 2396 2397Don't instrument functions with loops unless they also meet the minimum function size 2398 2399.. option:: -fxray-instruction-threshold<arg> 2400 2401.. program:: clang1 2402.. option:: -fxray-instruction-threshold=<arg> 2403.. program:: clang 2404 2405Sets the minimum function size to instrument with XRay 2406 2407.. option:: -fxray-instrument, -fno-xray-instrument 2408 2409Generate XRay instrumentation sleds on function entry and exit 2410 2411.. option:: -fxray-instrumentation-bundle=<arg> 2412 2413Select 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'. 2414 2415.. option:: -fxray-link-deps 2416 2417Tells clang to add the link dependencies for XRay. 2418 2419.. option:: -fxray-modes=<arg> 2420 2421List of modes to link in by default into XRay instrumented binaries. 2422 2423.. option:: -fxray-never-instrument=<arg> 2424 2425DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2426 2427.. option:: -fxray-selected-function-group=<arg> 2428 2429When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1 2430 2431.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2432 2433.. option:: -fzvector, -fno-zvector, -mzvector 2434 2435Enable System z vector language extension 2436 2437.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2438 2439.. option:: -pedantic-errors, --pedantic-errors 2440 2441OpenCL flags 2442------------ 2443.. option:: -cl-denorms-are-zero 2444 2445OpenCL only. Allow denormals to be flushed to zero. 2446 2447.. option:: -cl-fast-relaxed-math 2448 2449OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2450 2451.. option:: -cl-finite-math-only 2452 2453OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2454 2455.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2456 2457OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2458 2459.. option:: -cl-kernel-arg-info 2460 2461OpenCL only. Generate kernel argument metadata. 2462 2463.. option:: -cl-mad-enable 2464 2465OpenCL only. Allow use of less precise MAD computations in the generated binary. 2466 2467.. option:: -cl-no-signed-zeros 2468 2469OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2470 2471.. option:: -cl-opt-disable 2472 2473OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2474 2475.. option:: -cl-single-precision-constant 2476 2477OpenCL only. Treat double precision floating-point constant as single precision constant. 2478 2479.. option:: -cl-std=<arg> 2480 2481OpenCL language standard to compile for. 2482 2483.. option:: -cl-strict-aliasing 2484 2485OpenCL only. This option is added for compatibility with OpenCL 1.0. 2486 2487.. option:: -cl-uniform-work-group-size 2488 2489OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2490 2491.. option:: -cl-unsafe-math-optimizations 2492 2493OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2494 2495SYCL flags 2496---------- 2497.. option:: -fsycl, -fno-sycl 2498 2499Enable SYCL kernels compilation for device 2500 2501.. option:: -sycl-std=<arg> 2502 2503SYCL language standard to compile for. 2504 2505Target-dependent compilation options 2506~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2507.. option:: -G<size>, -G=<arg>, -msmall-data-limit=<arg>, -msmall-data-threshold=<arg> 2508 2509Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2510 2511.. option:: -ffixed-x1 2512 2513Reserve the x1 register (AArch64/RISC-V only) 2514 2515.. option:: -ffixed-x10 2516 2517Reserve the x10 register (AArch64/RISC-V only) 2518 2519.. option:: -ffixed-x11 2520 2521Reserve the x11 register (AArch64/RISC-V only) 2522 2523.. option:: -ffixed-x12 2524 2525Reserve the x12 register (AArch64/RISC-V only) 2526 2527.. option:: -ffixed-x13 2528 2529Reserve the x13 register (AArch64/RISC-V only) 2530 2531.. option:: -ffixed-x14 2532 2533Reserve the x14 register (AArch64/RISC-V only) 2534 2535.. option:: -ffixed-x15 2536 2537Reserve the x15 register (AArch64/RISC-V only) 2538 2539.. option:: -ffixed-x16 2540 2541Reserve the x16 register (AArch64/RISC-V only) 2542 2543.. option:: -ffixed-x17 2544 2545Reserve the x17 register (AArch64/RISC-V only) 2546 2547.. option:: -ffixed-x18 2548 2549Reserve the x18 register (AArch64/RISC-V only) 2550 2551.. option:: -ffixed-x19 2552 2553Reserve the x19 register (AArch64/RISC-V only) 2554 2555.. option:: -ffixed-x2 2556 2557Reserve the x2 register (AArch64/RISC-V only) 2558 2559.. option:: -ffixed-x20 2560 2561Reserve the x20 register (AArch64/RISC-V only) 2562 2563.. option:: -ffixed-x21 2564 2565Reserve the x21 register (AArch64/RISC-V only) 2566 2567.. option:: -ffixed-x22 2568 2569Reserve the x22 register (AArch64/RISC-V only) 2570 2571.. option:: -ffixed-x23 2572 2573Reserve the x23 register (AArch64/RISC-V only) 2574 2575.. option:: -ffixed-x24 2576 2577Reserve the x24 register (AArch64/RISC-V only) 2578 2579.. option:: -ffixed-x25 2580 2581Reserve the x25 register (AArch64/RISC-V only) 2582 2583.. option:: -ffixed-x26 2584 2585Reserve the x26 register (AArch64/RISC-V only) 2586 2587.. option:: -ffixed-x27 2588 2589Reserve the x27 register (AArch64/RISC-V only) 2590 2591.. option:: -ffixed-x28 2592 2593Reserve the x28 register (AArch64/RISC-V only) 2594 2595.. option:: -ffixed-x29 2596 2597Reserve the x29 register (AArch64/RISC-V only) 2598 2599.. option:: -ffixed-x3 2600 2601Reserve the x3 register (AArch64/RISC-V only) 2602 2603.. option:: -ffixed-x30 2604 2605Reserve the x30 register (AArch64/RISC-V only) 2606 2607.. option:: -ffixed-x31 2608 2609Reserve the x31 register (AArch64/RISC-V only) 2610 2611.. option:: -ffixed-x4 2612 2613Reserve the x4 register (AArch64/RISC-V only) 2614 2615.. option:: -ffixed-x5 2616 2617Reserve the x5 register (AArch64/RISC-V only) 2618 2619.. option:: -ffixed-x6 2620 2621Reserve the x6 register (AArch64/RISC-V only) 2622 2623.. option:: -ffixed-x7 2624 2625Reserve the x7 register (AArch64/RISC-V only) 2626 2627.. option:: -ffixed-x8 2628 2629Reserve the x8 register (AArch64/RISC-V only) 2630 2631.. option:: -ffixed-x9 2632 2633Reserve the x9 register (AArch64/RISC-V only) 2634 2635.. option:: -m16 2636 2637.. option:: -m32 2638 2639.. option:: -m64 2640 2641.. option:: -mabi=<arg> 2642 2643.. option:: -maix-struct-return 2644 2645Return all structs in memory (PPC32 only) 2646 2647.. option:: -malign-branch-boundary=<arg> 2648 2649Specify the boundary's size to align branches 2650 2651.. option:: -malign-branch=<arg1>,<arg2>... 2652 2653Specify types of branches to align 2654 2655.. option:: -malign-double 2656 2657Align doubles to two words in structs (x86 only) 2658 2659.. option:: -march=<arg> 2660 2661.. option:: -masm=<arg> 2662 2663.. option:: -mbackchain, -mno-backchain 2664 2665Link stack frames through backchain on System Z 2666 2667.. option:: -mbranches-within-32B-boundaries 2668 2669Align selected branches (fused, jcc, jmp) within 32-byte boundary 2670 2671.. option:: -mcmodel=<arg>, -mcmodel=medany (equivalent to -mcmodel=medium), -mcmodel=medlow (equivalent to -mcmodel=small) 2672 2673.. option:: -mcode-object-v3, -mno-code-object-v3 2674 2675Legacy option to specify code object ABI V2 (-mnocode-object-v3) or V3 (-mcode-object-v3) (AMDGPU only) 2676 2677.. option:: -mcode-object-version=<version> 2678 2679Specify code object ABI version. Defaults to 4. (AMDGPU only) 2680 2681.. option:: -mconsole<arg> 2682 2683.. program:: clang1 2684.. 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) 2685.. program:: clang 2686 2687.. option:: -mcrc, -mno-crc 2688 2689Allow use of CRC instructions (ARM/Mips only) 2690 2691.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2692 2693.. option:: -mdll<arg> 2694 2695.. option:: -mdouble=<arg> 2696 2697Force double to be 32 bits or 64 bits 2698 2699.. option:: -mdynamic-no-pic<arg> 2700 2701.. option:: -meabi <arg> 2702 2703Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2704 2705.. option:: -menable-experimental-extensions 2706 2707Enable use of experimental RISC-V extensions. 2708 2709.. option:: -mfentry 2710 2711Insert calls to fentry at function entry (x86/SystemZ only) 2712 2713.. option:: -mfloat-abi=<arg> 2714 2715.. option:: -mfpmath=<arg> 2716 2717.. option:: -mfpu=<arg> 2718 2719.. option:: -mglobal-merge, -mno-global-merge 2720 2721Enable merging of globals 2722 2723.. option:: -mhard-float 2724 2725.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 2726 2727.. option:: -mhwmult=<arg> 2728 2729.. option:: -miamcu, -mno-iamcu 2730 2731Use Intel MCU ABI 2732 2733.. option:: -mignore-xcoff-visibility 2734 2735Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file 2736 2737.. option:: -mimplicit-float, -mno-implicit-float 2738 2739.. option:: -mimplicit-it=<arg> 2740 2741.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 2742 2743(integrated-as) Emit an object file which can be used with an incremental linker 2744 2745.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 2746 2747.. option:: -mkernel 2748 2749.. option:: -mlong-calls, -mno-long-calls 2750 2751Generate branches with extended addressability, usually via indirect jumps. 2752 2753.. option:: -mlvi-cfi, -mno-lvi-cfi 2754 2755Enable only control-flow mitigations for Load Value Injection (LVI) 2756 2757.. option:: -mlvi-hardening, -mno-lvi-hardening 2758 2759Enable all mitigations for Load Value Injection (LVI) 2760 2761.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 2762 2763Set Mac OS X deployment target 2764 2765.. option:: -mmcu=<arg> 2766 2767.. option:: -mms-bitfields, -mno-ms-bitfields 2768 2769Set the default structure layout to be compatible with the Microsoft compiler standard 2770 2771.. option:: -mnop-mcount 2772 2773Generate mcount/\_\_fentry\_\_ calls as nops. To activate they need to be patched in. 2774 2775.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 2776 2777Omit frame pointer setup for leaf functions 2778 2779.. option:: -moslib=<arg> 2780 2781.. option:: -mpacked-stack, -mno-packed-stack 2782 2783Use packed stack layout (SystemZ only). 2784 2785.. option:: -mpad-max-prefix-size=<arg> 2786 2787Specify maximum number of prefixes to use for padding 2788 2789.. option:: -mpie-copy-relocations, -mno-pie-copy-relocations 2790 2791Use copy relocations support for PIE builds 2792 2793.. option:: -mprefer-vector-width=<arg> 2794 2795Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 2796 2797.. option:: -mqdsp6-compat 2798 2799Enable hexagon-qdsp6 backward compatibility 2800 2801.. option:: -mrecip 2802 2803.. program:: clang1 2804.. option:: -mrecip=<arg1>,<arg2>... 2805.. program:: clang 2806 2807.. option:: -mrecord-mcount 2808 2809Generate a \_\_mcount\_loc section entry for each \_\_fentry\_\_ call. 2810 2811.. option:: -mred-zone, -mno-red-zone 2812 2813.. option:: -mregparm=<arg> 2814 2815.. option:: -mrelax, -mno-relax 2816 2817Enable linker relaxation 2818 2819.. option:: -mrelax-all, -mno-relax-all 2820 2821(integrated-as) Relax all machine instructions 2822 2823.. option:: -mretpoline, -mno-retpoline 2824 2825.. option:: -mrtd, -mno-rtd 2826 2827Make StdCall calling convention the default 2828 2829.. option:: -mseses, -mno-seses 2830 2831Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations 2832 2833.. option:: -msign-return-address=<arg> 2834 2835Select return address signing scope 2836 2837.. option:: -msim 2838 2839.. option:: -msoft-float, -mno-soft-float 2840 2841Use software floating point 2842 2843.. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening 2844 2845.. option:: -mstack-alignment=<arg> 2846 2847Set the stack alignment 2848 2849.. option:: -mstack-arg-probe, -mno-stack-arg-probe 2850 2851Enable stack probes 2852 2853.. option:: -mstack-probe-size=<arg> 2854 2855Set the stack probe size 2856 2857.. option:: -mstack-protector-guard-offset=<arg> 2858 2859Use the given offset for addressing the stack-protector guard 2860 2861.. option:: -mstack-protector-guard-reg=<arg> 2862 2863Use the given reg for addressing the stack-protector guard 2864 2865.. option:: -mstack-protector-guard=<arg> 2866 2867Use the given guard (global, tls) for addressing the stack-protector guard 2868 2869.. option:: -mstackrealign, -mno-stackrealign 2870 2871Force realign the stack at entry to every function 2872 2873.. option:: -msvr4-struct-return 2874 2875Return small structs in registers (PPC32 only) 2876 2877.. option:: -mthread-model <arg> 2878 2879The thread model to use, e.g. posix, single (posix by default) 2880 2881.. option:: -mthreads<arg> 2882 2883.. option:: -mthumb, -mno-thumb 2884 2885.. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs 2886 2887Enable direct TLS access through segment registers (default) 2888 2889.. option:: -mtls-size=<arg> 2890 2891Specify 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) 2892 2893.. program:: clang1 2894.. option:: -mtune=<arg> 2895.. program:: clang 2896 2897Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC. 2898 2899.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 2900 2901.. option:: -municode<arg> 2902 2903.. option:: -mabi=vec-extabi, -mabi=vec-default 2904 2905Only 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. 2906 2907.. option:: -mvx, -mno-vx 2908 2909.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 2910 2911.. option:: -mwatchos-version-min=<arg> 2912 2913.. option:: -mwavefrontsize64, -mno-wavefrontsize64 2914 2915Specify wavefront size 64 mode (AMDGPU only) 2916 2917.. option:: -mwindows<arg> 2918 2919.. option:: -mx32 2920 2921AARCH64 2922------- 2923.. option:: -fcall-saved-x10 2924 2925Make the x10 register call-saved (AArch64 only) 2926 2927.. option:: -fcall-saved-x11 2928 2929Make the x11 register call-saved (AArch64 only) 2930 2931.. option:: -fcall-saved-x12 2932 2933Make the x12 register call-saved (AArch64 only) 2934 2935.. option:: -fcall-saved-x13 2936 2937Make the x13 register call-saved (AArch64 only) 2938 2939.. option:: -fcall-saved-x14 2940 2941Make the x14 register call-saved (AArch64 only) 2942 2943.. option:: -fcall-saved-x15 2944 2945Make the x15 register call-saved (AArch64 only) 2946 2947.. option:: -fcall-saved-x18 2948 2949Make the x18 register call-saved (AArch64 only) 2950 2951.. option:: -fcall-saved-x8 2952 2953Make the x8 register call-saved (AArch64 only) 2954 2955.. option:: -fcall-saved-x9 2956 2957Make the x9 register call-saved (AArch64 only) 2958 2959.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 2960 2961Workaround Cortex-A53 erratum 835769 (AArch64 only) 2962 2963.. option:: -mgeneral-regs-only 2964 2965Generate code which only uses the general purpose registers (AArch64 only) 2966 2967.. option:: -mmark-bti-property 2968 2969Add .note.gnu.property with BTI to assembly files (AArch64 only) 2970 2971.. option:: -msve-vector-bits=<arg> 2972 2973Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only) 2974 2975AMDGPU 2976------ 2977.. option:: -mcumode, -mno-cumode 2978 2979Specify CU (-mcumode) or WGP (-mno-cumode) wavefront execution mode (AMDGPU only) 2980 2981.. option:: -msram-ecc, -mno-sram-ecc 2982 2983Specify SRAM ECC mode (AMDGPU only) 2984 2985.. option:: -mxnack, -mno-xnack 2986 2987Specify XNACK mode (AMDGPU only) 2988 2989ARM 2990--- 2991.. option:: -faapcs-bitfield-load 2992 2993Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only). 2994 2995.. option:: -faapcs-bitfield-width, -fno-aapcs-bitfield-width 2996 2997Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only). 2998 2999.. option:: -ffixed-r9 3000 3001Reserve the r9 register (ARM only) 3002 3003.. option:: -mcmse 3004 3005Allow use of CMSE (Armv8-M Security Extensions) 3006 3007.. option:: -mexecute-only, -mno-execute-only, -mpure-code 3008 3009Disallow generation of data access to code sections (ARM only) 3010 3011.. option:: -mno-movt 3012 3013Disallow use of movt/movw pairs (ARM only) 3014 3015.. option:: -mno-neg-immediates 3016 3017Disallow converting instructions with negative immediates to their negation or inversion. 3018 3019.. option:: -mnocrc 3020 3021Disallow use of CRC instructions (ARM only) 3022 3023.. option:: -mrestrict-it, -mno-restrict-it 3024 3025Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 3026 3027.. option:: -mtp=<arg> 3028 3029Thread pointer access method (AArch32/AArch64 only) 3030 3031.. option:: -munaligned-access, -mno-unaligned-access 3032 3033Allow memory accesses to be unaligned (AArch32/AArch64 only) 3034 3035Hexagon 3036------- 3037.. option:: -mieee-rnd-near 3038 3039.. option:: -mmemops, -mno-memops 3040 3041Enable generation of memop instructions 3042 3043.. option:: -mnvj, -mno-nvj 3044 3045Enable generation of new-value jumps 3046 3047.. option:: -mnvs, -mno-nvs 3048 3049Enable generation of new-value stores 3050 3051.. option:: -mpackets, -mno-packets 3052 3053Enable generation of instruction packets 3054 3055Hexagon 3056------- 3057.. option:: -mhvx, -mno-hvx 3058 3059Enable Hexagon Vector eXtensions 3060 3061.. option:: -mhvx-length=<arg> 3062 3063Set Hexagon Vector Length 3064 3065.. program:: clang1 3066.. option:: -mhvx=<arg> 3067.. program:: clang 3068 3069Enable Hexagon Vector eXtensions 3070 3071MIPS 3072---- 3073.. option:: -mabicalls, -mno-abicalls 3074 3075Enable SVR4-style position-independent code (Mips only) 3076 3077.. option:: -mabs=<arg> 3078 3079.. option:: -mcheck-zero-division, -mno-check-zero-division 3080 3081.. option:: -mcompact-branches=<arg> 3082 3083.. option:: -mdouble-float 3084 3085.. option:: -mdsp, -mno-dsp 3086 3087.. option:: -mdspr2, -mno-dspr2 3088 3089.. option:: -membedded-data, -mno-embedded-data 3090 3091Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 3092 3093.. option:: -mextern-sdata, -mno-extern-sdata 3094 3095Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 3096 3097.. option:: -mfp32 3098 3099Use 32-bit floating point registers (MIPS only) 3100 3101.. option:: -mfp64 3102 3103Use 64-bit floating point registers (MIPS only) 3104 3105.. option:: -mginv, -mno-ginv 3106 3107.. option:: -mgpopt, -mno-gpopt 3108 3109Use GP relative accesses for symbols known to be in a small data section (MIPS) 3110 3111.. option:: -mindirect-jump=<arg> 3112 3113Change indirect jump instructions to inhibit speculation 3114 3115.. option:: -mips16 3116 3117.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 3118 3119.. option:: -mlocal-sdata, -mno-local-sdata 3120 3121Extend the -G behaviour to object local data (MIPS) 3122 3123.. option:: -mmadd4, -mno-madd4 3124 3125Enable the generation of 4-operand madd.s, madd.d and related instructions. 3126 3127.. option:: -mmicromips, -mno-micromips 3128 3129.. option:: -mmsa, -mno-msa 3130 3131Enable MSA ASE (MIPS only) 3132 3133.. option:: -mmt, -mno-mt 3134 3135Enable MT ASE (MIPS only) 3136 3137.. option:: -mnan=<arg> 3138 3139.. option:: -mno-mips16 3140 3141.. option:: -msingle-float 3142 3143.. option:: -mvirt, -mno-virt 3144 3145.. option:: -mxgot, -mno-xgot 3146 3147PowerPC 3148------- 3149.. option:: -maltivec, -mno-altivec 3150 3151.. option:: -mcmpb, -mno-cmpb 3152 3153.. option:: -mcrbits, -mno-crbits 3154 3155.. option:: -mcrypto, -mno-crypto 3156 3157.. option:: -mdirect-move, -mno-direct-move 3158 3159.. option:: -mefpu2 3160 3161.. option:: -mfloat128, -mno-float128 3162 3163.. option:: -mfprnd, -mno-fprnd 3164 3165.. option:: -mhtm, -mno-htm 3166 3167.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 3168 3169.. option:: -misel, -mno-isel 3170 3171.. option:: -mlongcall, -mno-longcall 3172 3173.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 3174 3175.. option:: -mmma, -mno-mma 3176 3177.. option:: -mpaired-vector-memops, -mno-paired-vector-memops 3178 3179.. option:: -mpcrel, -mno-pcrel 3180 3181.. option:: -mpopcntd, -mno-popcntd 3182 3183.. option:: -mpower10-vector, -mno-power10-vector 3184 3185.. option:: -mpower8-vector, -mno-power8-vector 3186 3187.. option:: -mpower9-vector, -mno-power9-vector 3188 3189.. option:: -msecure-plt 3190 3191.. option:: -mspe, -mno-spe 3192 3193.. option:: -mvsx, -mno-vsx 3194 3195WebAssembly 3196----------- 3197.. option:: -matomics, -mno-atomics 3198 3199.. option:: -mbulk-memory, -mno-bulk-memory 3200 3201.. option:: -mexception-handling, -mno-exception-handling 3202 3203.. option:: -mmultivalue, -mno-multivalue 3204 3205.. option:: -mmutable-globals, -mno-mutable-globals 3206 3207.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 3208 3209.. option:: -mreference-types, -mno-reference-types 3210 3211.. option:: -msign-ext, -mno-sign-ext 3212 3213.. option:: -msimd128, -mno-simd128 3214 3215.. option:: -mtail-call, -mno-tail-call 3216 3217.. option:: -munimplemented-simd128, -mno-unimplemented-simd128 3218 3219WebAssembly Driver 3220------------------ 3221.. option:: -mexec-model=<arg> 3222 3223Execution model (WebAssembly only) 3224 3225X86 3226--- 3227.. option:: -m3dnow, -mno-3dnow 3228 3229.. option:: -m3dnowa, -mno-3dnowa 3230 3231.. option:: -madx, -mno-adx 3232 3233.. option:: -maes, -mno-aes 3234 3235.. option:: -mamx-bf16, -mno-amx-bf16 3236 3237.. option:: -mamx-int8, -mno-amx-int8 3238 3239.. option:: -mamx-tile, -mno-amx-tile 3240 3241.. option:: -mavx, -mno-avx 3242 3243.. option:: -mavx2, -mno-avx2 3244 3245.. option:: -mavx512bf16, -mno-avx512bf16 3246 3247.. option:: -mavx512bitalg, -mno-avx512bitalg 3248 3249.. option:: -mavx512bw, -mno-avx512bw 3250 3251.. option:: -mavx512cd, -mno-avx512cd 3252 3253.. option:: -mavx512dq, -mno-avx512dq 3254 3255.. option:: -mavx512er, -mno-avx512er 3256 3257.. option:: -mavx512f, -mno-avx512f 3258 3259.. option:: -mavx512ifma, -mno-avx512ifma 3260 3261.. option:: -mavx512pf, -mno-avx512pf 3262 3263.. option:: -mavx512vbmi, -mno-avx512vbmi 3264 3265.. option:: -mavx512vbmi2, -mno-avx512vbmi2 3266 3267.. option:: -mavx512vl, -mno-avx512vl 3268 3269.. option:: -mavx512vnni, -mno-avx512vnni 3270 3271.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 3272 3273.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 3274 3275.. option:: -mavxvnni, -mno-avxvnni 3276 3277.. option:: -mbmi, -mno-bmi 3278 3279.. option:: -mbmi2, -mno-bmi2 3280 3281.. option:: -mcldemote, -mno-cldemote 3282 3283.. option:: -mclflushopt, -mno-clflushopt 3284 3285.. option:: -mclwb, -mno-clwb 3286 3287.. option:: -mclzero, -mno-clzero 3288 3289.. option:: -mcx16, -mno-cx16 3290 3291.. option:: -menqcmd, -mno-enqcmd 3292 3293.. option:: -mf16c, -mno-f16c 3294 3295.. option:: -mfma, -mno-fma 3296 3297.. option:: -mfma4, -mno-fma4 3298 3299.. option:: -mfsgsbase, -mno-fsgsbase 3300 3301.. option:: -mfxsr, -mno-fxsr 3302 3303.. option:: -mgfni, -mno-gfni 3304 3305.. option:: -mhreset, -mno-hreset 3306 3307.. option:: -minvpcid, -mno-invpcid 3308 3309.. option:: -mkl, -mno-kl 3310 3311.. option:: -mlwp, -mno-lwp 3312 3313.. option:: -mlzcnt, -mno-lzcnt 3314 3315.. option:: -mmmx, -mno-mmx 3316 3317.. option:: -mmovbe, -mno-movbe 3318 3319.. option:: -mmovdir64b, -mno-movdir64b 3320 3321.. option:: -mmovdiri, -mno-movdiri 3322 3323.. option:: -mmwaitx, -mno-mwaitx 3324 3325.. option:: -mpclmul, -mno-pclmul 3326 3327.. option:: -mpconfig, -mno-pconfig 3328 3329.. option:: -mpku, -mno-pku 3330 3331.. option:: -mpopcnt, -mno-popcnt 3332 3333.. option:: -mprefetchwt1, -mno-prefetchwt1 3334 3335.. option:: -mprfchw, -mno-prfchw 3336 3337.. option:: -mptwrite, -mno-ptwrite 3338 3339.. option:: -mrdpid, -mno-rdpid 3340 3341.. option:: -mrdrnd, -mno-rdrnd 3342 3343.. option:: -mrdseed, -mno-rdseed 3344 3345.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 3346 3347.. option:: -mrtm, -mno-rtm 3348 3349.. option:: -msahf, -mno-sahf 3350 3351.. option:: -mserialize, -mno-serialize 3352 3353.. option:: -msgx, -mno-sgx 3354 3355.. option:: -msha, -mno-sha 3356 3357.. option:: -mshstk, -mno-shstk 3358 3359.. option:: -msse, -mno-sse 3360 3361.. option:: -msse2, -mno-sse2 3362 3363.. option:: -msse3, -mno-sse3 3364 3365.. option:: -msse4.1, -mno-sse4.1 3366 3367.. program:: clang1 3368.. option:: -msse4.2, -mno-sse4.2, -msse4 3369.. program:: clang 3370 3371.. option:: -msse4a, -mno-sse4a 3372 3373.. option:: -mssse3, -mno-ssse3 3374 3375.. option:: -mtbm, -mno-tbm 3376 3377.. option:: -mtsxldtrk, -mno-tsxldtrk 3378 3379.. option:: -muintr, -mno-uintr 3380 3381.. option:: -mvaes, -mno-vaes 3382 3383.. option:: -mvpclmulqdq, -mno-vpclmulqdq 3384 3385.. option:: -mvzeroupper, -mno-vzeroupper 3386 3387.. option:: -mwaitpkg, -mno-waitpkg 3388 3389.. option:: -mwbnoinvd, -mno-wbnoinvd 3390 3391.. option:: -mwidekl, -mno-widekl 3392 3393.. option:: -mx87, -m80387, -mno-x87 3394 3395.. option:: -mxop, -mno-xop 3396 3397.. option:: -mxsave, -mno-xsave 3398 3399.. option:: -mxsavec, -mno-xsavec 3400 3401.. option:: -mxsaveopt, -mno-xsaveopt 3402 3403.. option:: -mxsaves, -mno-xsaves 3404 3405RISCV 3406----- 3407.. option:: -msave-restore, -mno-save-restore 3408 3409Enable using library calls for save and restore 3410 3411Long double flags 3412----------------- 3413Selects the long double implementation 3414 3415.. option:: -mlong-double-128 3416 3417Force long double to be 128 bits 3418 3419.. option:: -mlong-double-64 3420 3421Force long double to be 64 bits 3422 3423.. option:: -mlong-double-80 3424 3425Force long double to be 80 bits, padded to 128 bits for storage 3426 3427Optimization level 3428~~~~~~~~~~~~~~~~~~ 3429 3430Flags controlling how much optimization should be performed. 3431 3432.. option:: -O<arg>, -O (equivalent to -O1), --optimize, --optimize=<arg> 3433 3434.. option:: -Ofast<arg> 3435 3436Debug information generation 3437~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3438 3439Flags controlling how much and what kind of debug information should be 3440generated. 3441 3442Kind and level of debug information 3443----------------------------------- 3444.. option:: -g, --debug, --debug=<arg> 3445 3446Generate source-level debug information 3447 3448.. option:: -gdwarf 3449 3450Generate source-level debug information with the default dwarf version 3451 3452.. option:: -gdwarf-2 3453 3454Generate source-level debug information with dwarf version 2 3455 3456.. option:: -gdwarf-3 3457 3458Generate source-level debug information with dwarf version 3 3459 3460.. option:: -gdwarf-4 3461 3462Generate source-level debug information with dwarf version 4 3463 3464.. option:: -gdwarf-5 3465 3466Generate source-level debug information with dwarf version 5 3467 3468.. option:: -gfull 3469 3470.. option:: -gused 3471 3472Debug level 3473___________ 3474.. option:: -g0 3475 3476.. option:: -g2 3477 3478.. option:: -g3 3479 3480.. option:: -ggdb0 3481 3482.. option:: -ggdb1 3483 3484.. option:: -ggdb2 3485 3486.. option:: -ggdb3 3487 3488.. option:: -gline-directives-only 3489 3490Emit debug line info directives only 3491 3492.. option:: -gline-tables-only, -g1, -gmlt 3493 3494Emit debug line number tables only 3495 3496.. option:: -gmodules 3497 3498Generate debug info with external references to clang modules or precompiled headers 3499 3500Debugger to tune debug information for 3501______________________________________ 3502.. option:: -ggdb 3503 3504.. option:: -glldb 3505 3506.. option:: -gsce 3507 3508Debug information flags 3509----------------------- 3510.. option:: -gcolumn-info, -gno-column-info 3511 3512.. option:: -gdwarf-aranges 3513 3514.. option:: -gembed-source, -gno-embed-source 3515 3516Embed source text in DWARF debug sections 3517 3518.. option:: -ggnu-pubnames, -gno-gnu-pubnames 3519 3520.. option:: -gpubnames, -gno-pubnames 3521 3522.. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches 3523 3524.. option:: -gsplit-dwarf 3525 3526.. program:: clang1 3527.. option:: -gsplit-dwarf=<arg> 3528.. program:: clang 3529 3530Set DWARF fission mode to either 'split' or 'single' 3531 3532.. option:: -gstrict-dwarf, -gno-strict-dwarf 3533 3534.. option:: -gz=<arg>, -gz (equivalent to -gz=zlib) 3535 3536DWARF debug sections compression type 3537 3538Static analyzer flags 3539===================== 3540 3541Flags controlling the behavior of the Clang Static Analyzer. 3542 3543.. option:: -Xanalyzer <arg> 3544 3545Pass <arg> to the static analyzer 3546 3547Fortran compilation flags 3548========================= 3549 3550Flags that will be passed onto the ``gfortran`` compiler when Clang is given 3551a Fortran input. 3552 3553.. option:: -A<arg>, --assert <arg>, --assert=<arg> 3554 3555.. option:: -A-<arg> 3556 3557.. option:: -J<arg> 3558 3559.. option:: -cpp 3560 3561.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 3562 3563.. option:: -falign-commons, -fno-align-commons 3564 3565.. option:: -fall-intrinsics, -fno-all-intrinsics 3566 3567.. option:: -fautomatic, -fno-automatic 3568 3569.. option:: -fbackslash, -fno-backslash 3570 3571.. option:: -fbacktrace, -fno-backtrace 3572 3573.. option:: -fblas-matmul-limit=<arg> 3574 3575.. option:: -fbounds-check, -fno-bounds-check 3576 3577.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 3578 3579.. option:: -fcheck=<arg> 3580 3581.. option:: -fcoarray=<arg> 3582 3583.. option:: -fconvert=<arg> 3584 3585.. option:: -fcray-pointer, -fno-cray-pointer 3586 3587.. option:: -fd-lines-as-code, -fno-d-lines-as-code 3588 3589.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 3590 3591.. option:: -fdefault-double-8, -fno-default-double-8 3592 3593.. option:: -fdefault-integer-8, -fno-default-integer-8 3594 3595.. option:: -fdefault-real-8, -fno-default-real-8 3596 3597.. option:: -fdollar-ok, -fno-dollar-ok 3598 3599.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 3600 3601.. option:: -fdump-fortran-original, -fno-dump-fortran-original 3602 3603.. option:: -fdump-parse-tree, -fno-dump-parse-tree 3604 3605.. option:: -fexternal-blas, -fno-external-blas 3606 3607.. option:: -ff2c, -fno-f2c 3608 3609.. option:: -ffixed-form, -fno-fixed-form 3610 3611.. option:: -ffixed-line-length-<arg> 3612 3613.. option:: -ffpe-trap=<arg> 3614 3615.. option:: -ffree-form, -fno-free-form 3616 3617.. option:: -ffree-line-length-<arg> 3618 3619.. option:: -ffrontend-optimize, -fno-frontend-optimize 3620 3621.. option:: -fimplicit-none, -fno-implicit-none 3622 3623.. option:: -finit-character=<arg> 3624 3625.. option:: -finit-integer=<arg> 3626 3627.. option:: -finit-local-zero, -fno-init-local-zero 3628 3629.. option:: -finit-logical=<arg> 3630 3631.. option:: -finit-real=<arg> 3632 3633.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 3634 3635.. option:: -fintrinsic-modules-path, -fno-intrinsic-modules-path 3636 3637.. option:: -fmax-array-constructor=<arg> 3638 3639.. option:: -fmax-errors=<arg> 3640 3641.. option:: -fmax-identifier-length, -fno-max-identifier-length 3642 3643.. option:: -fmax-stack-var-size=<arg> 3644 3645.. option:: -fmax-subrecord-length=<arg> 3646 3647.. option:: -fmodule-private, -fno-module-private 3648 3649.. option:: -fpack-derived, -fno-pack-derived 3650 3651.. option:: -fprotect-parens, -fno-protect-parens 3652 3653.. option:: -frange-check, -fno-range-check 3654 3655.. option:: -freal-4-real-10, -fno-real-4-real-10 3656 3657.. option:: -freal-4-real-16, -fno-real-4-real-16 3658 3659.. option:: -freal-4-real-8, -fno-real-4-real-8 3660 3661.. option:: -freal-8-real-10, -fno-real-8-real-10 3662 3663.. option:: -freal-8-real-16, -fno-real-8-real-16 3664 3665.. option:: -freal-8-real-4, -fno-real-8-real-4 3666 3667.. option:: -frealloc-lhs, -fno-realloc-lhs 3668 3669.. option:: -frecord-marker=<arg> 3670 3671.. option:: -frecursive, -fno-recursive 3672 3673.. option:: -frepack-arrays, -fno-repack-arrays 3674 3675.. option:: -fsecond-underscore, -fno-second-underscore 3676 3677.. option:: -fsign-zero, -fno-sign-zero 3678 3679.. option:: -fstack-arrays, -fno-stack-arrays 3680 3681.. option:: -funderscoring, -fno-underscoring 3682 3683.. option:: -fwhole-file, -fno-whole-file 3684 3685.. option:: -imultilib <arg> 3686 3687.. option:: -nocpp 3688 3689.. option:: -static-libgfortran 3690 3691Linker flags 3692============ 3693Flags that are passed on to the linker 3694 3695.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 3696 3697Add directory to library search path 3698 3699.. option:: -Mach 3700 3701.. option:: -T<script> 3702 3703Specify <script> as linker script 3704 3705.. option:: -Tbss<addr> 3706 3707Set starting address of BSS to <addr> 3708 3709.. option:: -Tdata<addr> 3710 3711Set starting address of DATA to <addr> 3712 3713.. option:: -Ttext<addr> 3714 3715Set starting address of TEXT to <addr> 3716 3717.. option:: -Wl,<arg>,<arg2>... 3718 3719Pass the comma separated arguments in <arg> to the linker 3720 3721.. option:: -X 3722 3723.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 3724 3725Pass <arg> to the linker 3726 3727.. program:: clang1 3728.. option:: -Z 3729.. program:: clang 3730 3731.. option:: -coverage, --coverage 3732 3733.. option:: -e<arg>, --entry 3734 3735.. option:: -filelist <arg> 3736 3737.. option:: --hip-device-lib=<arg> 3738 3739HIP device library 3740 3741.. option:: -l<arg> 3742 3743.. option:: --ld-path=<arg> 3744 3745.. option:: -nostartfiles 3746 3747.. program:: clang1 3748.. option:: -nostdlib, --no-standard-libraries 3749.. program:: clang 3750 3751.. option:: -pie 3752 3753.. option:: -r 3754 3755.. option:: -rdynamic 3756 3757.. option:: --rocm-device-lib-path=<arg>, --hip-device-lib-path=<arg> 3758 3759ROCm device library path. Alternative to rocm-path. 3760 3761.. option:: -rpath <arg> 3762 3763.. option:: -s 3764 3765.. option:: -shared, --shared 3766 3767.. option:: -specs=<arg>, --specs=<arg> 3768 3769.. option:: -static, --static 3770 3771.. option:: -static-pie 3772 3773.. option:: -t 3774 3775.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 3776 3777.. option:: -undef 3778 3779undef all system defines 3780 3781.. option:: -undefined<arg>, --no-undefined 3782 3783.. option:: -z <arg> 3784 3785Pass -z <arg> to the linker 3786 3787