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<prefix>, --prefix <arg>, --prefix=<arg> 22 23Search $prefix/$triple-$file and $prefix$file for executables, libraries, includes, and data files used by the compiler. $prefix may or may not be a directory 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\|sarif-html\|text). 106 107.. option:: -arch <arg> 108 109.. program:: clang1 110.. option:: -arch\_errors\_fatal 111.. program:: clang 112 113.. program:: clang2 114.. option:: -arch\_only <arg> 115.. program:: clang 116 117.. option:: -arcmt-migrate-emit-errors 118 119Emit ARC errors even if the migrator can fix them 120 121.. option:: -arcmt-migrate-report-output <arg> 122 123Output path for the plist report 124 125.. option:: --autocomplete=<arg> 126 127.. option:: -bind\_at\_load 128 129.. option:: -bundle 130 131.. program:: clang1 132.. option:: -bundle\_loader <arg> 133.. program:: clang 134 135.. option:: -client\_name<arg> 136 137.. option:: -compatibility\_version<arg> 138 139.. option:: --config <arg> 140 141Specifies configuration file 142 143.. option:: --constant-cfstrings 144 145.. option:: --cuda-compile-host-device 146 147Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations. 148 149.. option:: --cuda-device-only 150 151Compile CUDA code for device only 152 153.. option:: --cuda-host-only 154 155Compile CUDA code for host only. Has no effect on non-CUDA compilations. 156 157.. option:: --cuda-include-ptx=<arg>, --no-cuda-include-ptx=<arg> 158 159Include PTX for the following GPU architecture (e.g. sm\_35) or 'all'. May be specified more than once. 160 161.. option:: --cuda-noopt-device-debug, --no-cuda-noopt-device-debug 162 163Enable device-side debug info generation. Disables ptxas optimizations. 164 165.. option:: -cuid=<arg> 166 167An ID for compilation unit, which should be the same for the same compilation unit but different for different compilation units. It is used to externalize device-side static variables for single source offloading languages CUDA and HIP so that they can be accessed by the host code of the same compilation unit. 168 169.. option:: -current\_version<arg> 170 171.. option:: -dead\_strip 172 173.. option:: -dependency-dot <arg> 174 175Filename to write DOT-formatted header dependencies to 176 177.. option:: -dependency-file <arg> 178 179Filename (or -) to write dependency output to 180 181.. option:: -dsym-dir<dir> 182 183Directory to output dSYM's (if any) to 184 185.. option:: -dumpmachine 186 187.. option:: -dumpversion 188 189.. option:: --dyld-prefix=<arg>, --dyld-prefix <arg> 190 191.. option:: -dylib\_file <arg> 192 193.. option:: -dylinker 194 195.. program:: clang1 196.. option:: -dylinker\_install\_name<arg> 197.. program:: clang 198 199.. option:: -dynamic 200 201.. option:: -dynamiclib 202 203.. option:: -emit-ast 204 205Emit Clang AST files for source inputs 206 207.. option:: --emit-static-lib 208 209Enable linker job to emit a static library. 210 211.. option:: -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 212 213Trivial 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 214 215.. option:: --end-no-unused-arguments 216 217Start emitting warnings for unused driver arguments 218 219.. option:: -exported\_symbols\_list <arg> 220 221.. option:: -faligned-new=<arg> 222 223.. option:: -fautomatic 224 225.. option:: -ffixed-r19 226 227Reserve register r19 (Hexagon only) 228 229.. option:: -fgpu-flush-denormals-to-zero, -fcuda-flush-denormals-to-zero, -fno-gpu-flush-denormals-to-zero 230 231Flush denormal floating point values to zero in CUDA/HIP device mode. 232 233.. option:: -fheinous-gnu-extensions 234 235.. option:: -flat\_namespace 236 237.. option:: -fopenmp-targets=<arg1>,<arg2>... 238 239Specify comma-separated list of triples OpenMP offloading targets to be supported 240 241.. option:: -force\_cpusubtype\_ALL 242 243.. program:: clang1 244.. option:: -force\_flat\_namespace 245.. program:: clang 246 247.. program:: clang2 248.. option:: -force\_load <arg> 249.. program:: clang 250 251.. option:: -fplugin-arg-<name>-<arg> 252 253Pass <arg> to plugin <name> 254 255.. option:: -framework <arg> 256 257.. option:: -frtlib-add-rpath, -fno-rtlib-add-rpath 258 259Add -rpath with architecture-specific resource directory to the linker flags 260 261.. option:: -fsanitize-system-ignorelist=<arg>, -fsanitize-system-blacklist=<arg> 262 263Path to system ignorelist file for sanitizers 264 265.. option:: -fshow-skipped-includes 266 267#include files may be "skipped" due to include guard optimization 268 or #pragma once. This flag makes -H show also such includes. 269 270.. option:: -fsystem-module 271 272Build this module as a system module. Only used with -emit-module 273 274.. option:: -fuse-cuid=<arg> 275 276Method to generate ID's for compilation units for single source offloading languages CUDA and HIP: 'hash' (ID's generated by hashing file path and command line options) \| 'random' (ID's generated as random numbers) \| 'none' (disabled). Default is 'hash'. This option will be overridden by option '-cuid=\[ID\]' if it is specified. 277 278.. option:: --gcc-toolchain=<arg> 279 280Search for GCC installation in the specified directory on targets which commonly use GCC. The directory usually contains 'lib{,32,64}/gcc{,-cross}/$triple' and 'include'. If specified, sysroot is skipped for GCC detection. Note: executables (e.g. ld) used by the compiler are not overridden by the selected GCC installation 281 282.. option:: -gcodeview 283 284Generate CodeView debug information 285 286.. option:: -gcodeview-ghash, -gno-codeview-ghash 287 288Emit type record hashes in a .debug$H section 289 290.. option:: --gpu-instrument-lib=<arg> 291 292Instrument device library for HIP, which is a LLVM bitcode containing \_\_cyg\_profile\_func\_enter and \_\_cyg\_profile\_func\_exit 293 294.. option:: --gpu-max-threads-per-block=<arg> 295 296Default max threads per block for kernel launch bounds for HIP 297 298.. option:: -headerpad\_max\_install\_names<arg> 299 300.. option:: -help, --help 301 302Display available options 303 304.. option:: --help-hidden 305 306Display help for hidden options 307 308.. option:: --hip-link 309 310Link clang-offload-bundler bundles for HIP 311 312.. option:: --hip-version=<arg> 313 314HIP version in the format of major.minor.patch 315 316.. option:: -ibuiltininc 317 318Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it 319 320.. option:: -image\_base <arg> 321 322.. option:: -index-header-map 323 324Make the next included directory (-I or -F) an indexer header map 325 326.. option:: -init <arg> 327 328.. option:: -install\_name <arg> 329 330.. option:: -interface-stub-version=<arg> 331 332.. option:: -keep\_private\_externs 333 334.. option:: -lazy\_framework <arg> 335 336.. program:: clang1 337.. option:: -lazy\_library <arg> 338.. program:: clang 339 340.. option:: -mbig-endian, -EB 341 342.. option:: -mbranch-protection=<arg> 343 344Enforce targets of indirect branches and function returns 345 346.. option:: -menable-unsafe-fp-math 347 348Allow unsafe floating-point math optimizations which may decrease precision 349 350.. option:: -mharden-sls=<arg> 351 352Select straight-line speculation hardening scope 353 354.. option:: --migrate 355 356Run the migrator 357 358.. option:: -mios-simulator-version-min=<arg>, -miphonesimulator-version-min=<arg> 359 360.. option:: -mlinker-version=<arg> 361 362.. option:: -mlittle-endian, -EL 363 364.. option:: -mllvm <arg> 365 366Additional arguments to forward to LLVM's option processing 367 368.. option:: -module-dependency-dir <arg> 369 370Directory to dump module dependencies to 371 372.. option:: -mtvos-simulator-version-min=<arg>, -mappletvsimulator-version-min=<arg> 373 374.. option:: -multi\_module 375 376.. option:: -multiply\_defined <arg> 377 378.. program:: clang1 379.. option:: -multiply\_defined\_unused <arg> 380.. program:: clang 381 382.. option:: -mwatchos-simulator-version-min=<arg>, -mwatchsimulator-version-min=<arg> 383 384.. option:: --no-cuda-version-check 385 386Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture. 387 388.. option:: -no-integrated-cpp, --no-integrated-cpp 389 390.. option:: -no\_dead\_strip\_inits\_and\_terms 391 392.. option:: -nobuiltininc 393 394Disable builtin #include directories 395 396.. option:: -nodefaultlibs 397 398.. option:: -nofixprebinding 399 400.. option:: -nogpuinc, -nocudainc 401 402Do not add include paths for CUDA/HIP and do not include the default CUDA/HIP wrapper headers 403 404.. option:: -nogpulib, -nocudalib 405 406Do not link device library for CUDA/HIP device compilation 407 408.. option:: -nohipwrapperinc 409 410Do not include the default HIP wrapper headers and include paths 411 412.. option:: -nolibc 413 414.. option:: -nomultidefs 415 416.. option:: -nopie, -no-pie 417 418.. option:: -noprebind 419 420.. option:: -noprofilelib 421 422.. option:: -noseglinkedit 423 424.. option:: -nostdinc, --no-standard-includes 425 426.. program:: clang1 427.. option:: -nostdinc++ 428.. program:: clang 429 430Disable standard #include directories for the C++ standard library 431 432.. option:: -nostdlib++ 433 434.. option:: -nostdlibinc 435 436.. option:: -o<file>, --output <arg>, --output=<arg> 437 438Write output to <file> 439 440.. option:: -objcmt-allowlist-dir-path=<arg>, -objcmt-white-list-dir-path=<arg>, -objcmt-whitelist-dir-path=<arg> 441 442Only modify files with a filename contained in the provided directory path 443 444.. option:: -objcmt-atomic-property 445 446Make migration to 'atomic' properties 447 448.. option:: -objcmt-migrate-all 449 450Enable migration to modern ObjC 451 452.. option:: -objcmt-migrate-annotation 453 454Enable migration to property and method annotations 455 456.. option:: -objcmt-migrate-designated-init 457 458Enable migration to infer NS\_DESIGNATED\_INITIALIZER for initializer methods 459 460.. option:: -objcmt-migrate-instancetype 461 462Enable migration to infer instancetype for method result type 463 464.. option:: -objcmt-migrate-literals 465 466Enable migration to modern ObjC literals 467 468.. option:: -objcmt-migrate-ns-macros 469 470Enable migration to NS\_ENUM/NS\_OPTIONS macros 471 472.. option:: -objcmt-migrate-property 473 474Enable migration to modern ObjC property 475 476.. option:: -objcmt-migrate-property-dot-syntax 477 478Enable migration of setter/getter messages to property-dot syntax 479 480.. option:: -objcmt-migrate-protocol-conformance 481 482Enable migration to add protocol conformance on classes 483 484.. option:: -objcmt-migrate-readonly-property 485 486Enable migration to modern ObjC readonly property 487 488.. option:: -objcmt-migrate-readwrite-property 489 490Enable migration to modern ObjC readwrite property 491 492.. option:: -objcmt-migrate-subscripting 493 494Enable migration to modern ObjC subscripting 495 496.. option:: -objcmt-ns-nonatomic-iosonly 497 498Enable migration to use NS\_NONATOMIC\_IOSONLY macro for setting property's 'atomic' attribute 499 500.. option:: -objcmt-returns-innerpointer-property 501 502Enable migration to annotate property with NS\_RETURNS\_INNER\_POINTER 503 504.. option:: -object 505 506.. option:: -object-file-name=<file>, -object-file-name <arg> 507 508Set the output <file> for debug infos 509 510.. option:: --offload-arch=<arg>, --cuda-gpu-arch=<arg>, --no-offload-arch=<arg> 511 512CUDA 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+:sramecc-). May be specified more than once. 513 514.. option:: --offload=<arg1>,<arg2>... 515 516Specify comma-separated list of offloading target triples (HIP only) 517 518.. option:: -p, --profile 519 520.. option:: -pagezero\_size<arg> 521 522.. option:: -pg 523 524Enable mcount instrumentation 525 526.. option:: -pipe, --pipe 527 528Use pipes between commands, when possible 529 530.. option:: -prebind 531 532.. program:: clang1 533.. option:: -prebind\_all\_twolevel\_modules 534.. program:: clang 535 536.. option:: -preload 537 538.. option:: --print-diagnostic-categories 539 540.. option:: -print-effective-triple, --print-effective-triple 541 542Print the effective target triple 543 544.. option:: -print-file-name=<file>, --print-file-name=<file>, --print-file-name <arg> 545 546Print the full library path of <file> 547 548.. option:: -print-ivar-layout 549 550Enable Objective-C Ivar layout bitmap print trace 551 552.. option:: -print-libgcc-file-name, --print-libgcc-file-name 553 554Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang\_rt.builtins.\*.a") 555 556.. option:: -print-multi-directory, --print-multi-directory 557 558.. option:: -print-multi-lib, --print-multi-lib 559 560.. option:: -print-multiarch, --print-multiarch 561 562Print the multiarch target triple 563 564.. option:: -print-prog-name=<name>, --print-prog-name=<name>, --print-prog-name <arg> 565 566Print the full program path of <name> 567 568.. option:: -print-resource-dir, --print-resource-dir 569 570Print the resource directory pathname 571 572.. option:: -print-rocm-search-dirs, --print-rocm-search-dirs 573 574Print the paths used for finding ROCm installation 575 576.. option:: -print-runtime-dir, --print-runtime-dir 577 578Print the directory pathname containing clangs runtime libraries 579 580.. option:: -print-search-dirs, --print-search-dirs 581 582Print the paths used for finding libraries and programs 583 584.. option:: -print-target-triple, --print-target-triple 585 586Print the normalized target triple 587 588.. option:: -print-targets, --print-targets 589 590Print the registered targets 591 592.. option:: -private\_bundle 593 594.. option:: -pthread, -no-pthread 595 596Support POSIX threads in generated code 597 598.. option:: -pthreads 599 600.. option:: -read\_only\_relocs <arg> 601 602.. option:: -relocatable-pch, --relocatable-pch 603 604Whether to build a relocatable precompiled header 605 606.. option:: -remap 607 608.. option:: -rewrite-legacy-objc 609 610Rewrite Legacy Objective-C source to C++ 611 612.. option:: -rtlib=<arg>, --rtlib=<arg>, --rtlib <arg> 613 614Compiler runtime library to use 615 616.. option:: -save-stats=<arg>, --save-stats=<arg>, -save-stats (equivalent to -save-stats=cwd), --save-stats (equivalent to -save-stats=cwd) 617 618Save llvm statistics. 619 620.. option:: -save-temps=<arg>, --save-temps=<arg>, -save-temps (equivalent to -save-temps=cwd), --save-temps (equivalent to -save-temps=cwd) 621 622Save intermediate compilation results. 623 624.. option:: -sectalign <arg1> <arg2> <arg3> 625 626.. option:: -sectcreate <arg1> <arg2> <arg3> 627 628.. option:: -sectobjectsymbols <arg1> <arg2> 629 630.. option:: -sectorder <arg1> <arg2> <arg3> 631 632.. option:: -seg1addr<arg> 633 634.. option:: -seg\_addr\_table <arg> 635 636.. program:: clang1 637.. option:: -seg\_addr\_table\_filename <arg> 638.. program:: clang 639 640.. option:: -segaddr <arg1> <arg2> 641 642.. option:: -segcreate <arg1> <arg2> <arg3> 643 644.. option:: -seglinkedit 645 646.. option:: -segprot <arg1> <arg2> <arg3> 647 648.. option:: -segs\_read\_<arg> 649 650.. program:: clang1 651.. option:: -segs\_read\_only\_addr <arg> 652.. program:: clang 653 654.. program:: clang2 655.. option:: -segs\_read\_write\_addr <arg> 656.. program:: clang 657 658.. option:: -serialize-diagnostics <arg>, --serialize-diagnostics <arg> 659 660Serialize compiler diagnostics to a file 661 662.. option:: -shared-libgcc 663 664.. option:: -shared-libsan, -shared-libasan 665 666Dynamically link the sanitizer runtime 667 668.. option:: -single\_module 669 670.. option:: --start-no-unused-arguments 671 672Don't emit warnings about unused arguments for the following arguments 673 674.. option:: -static-libgcc 675 676.. option:: -static-libsan 677 678Statically link the sanitizer runtime 679 680.. option:: -static-libstdc++ 681 682.. option:: -static-openmp 683 684Use the static host OpenMP runtime while linking. 685 686.. option:: -std-default=<arg> 687 688.. option:: -stdlib=<arg>, --stdlib=<arg>, --stdlib <arg> 689 690C++ standard library to use 691 692.. option:: -sub\_library<arg> 693 694.. program:: clang1 695.. option:: -sub\_umbrella<arg> 696.. program:: clang 697 698.. option:: --sysroot=<arg>, --sysroot <arg> 699 700.. option:: --target-help 701 702.. option:: --target=<arg>, -target <arg> 703 704Generate code for the given target 705 706.. option:: -time 707 708Time individual commands 709 710.. option:: -traditional, --traditional 711 712.. option:: -traditional-cpp, --traditional-cpp 713 714Enable some traditional CPP emulation 715 716.. option:: -twolevel\_namespace 717 718.. program:: clang1 719.. option:: -twolevel\_namespace\_hints 720.. program:: clang 721 722.. option:: -umbrella <arg> 723 724.. option:: -unexported\_symbols\_list <arg> 725 726.. option:: -unwindlib=<arg>, --unwindlib=<arg> 727 728Unwind library to use 729 730.. option:: -v, --verbose 731 732Show commands to run and use verbose output 733 734.. option:: --verify-debug-info 735 736Verify the binary representation of debug output 737 738.. option:: --version 739 740Print version information 741 742.. option:: -w, --no-warnings 743 744Suppress all warnings 745 746.. option:: -weak-l<arg> 747 748.. option:: -weak\_framework <arg> 749 750.. program:: clang1 751.. option:: -weak\_library <arg> 752.. program:: clang 753 754.. program:: clang2 755.. option:: -weak\_reference\_mismatches <arg> 756.. program:: clang 757 758.. option:: -whatsloaded 759 760.. option:: -why\_load, -whyload 761 762.. option:: -working-directory<arg>, -working-directory=<arg> 763 764Resolve file paths relative to the specified directory 765 766.. option:: -x<language>, --language <arg>, --language=<arg> 767 768Treat subsequent input files as having type <language> 769 770.. option:: -y<arg> 771 772Actions 773======= 774The action to perform on the input. 775 776.. option:: -E, --preprocess 777 778Only run the preprocessor 779 780.. option:: -S, --assemble 781 782Only run preprocess and compilation steps 783 784.. option:: -c, --compile 785 786Only run preprocess, compile, and assemble steps 787 788.. option:: -emit-interface-stubs 789 790Generate Interface Stub Files. 791 792.. option:: -emit-llvm 793 794Use the LLVM representation for assembler and object files 795 796.. option:: -emit-merged-ifs 797 798Generate Interface Stub Files, emit merged text not binary. 799 800.. option:: -fsyntax-only 801 802.. option:: -module-file-info 803 804Provide information about a particular module file 805 806.. option:: --precompile 807 808Only precompile the input 809 810.. option:: -rewrite-objc 811 812Rewrite Objective-C source to C++ 813 814.. option:: -verify-pch 815 816Load and verify that a pre-compiled header file is not stale 817 818Compilation flags 819================= 820 821Flags controlling the behavior of Clang during compilation. These flags have 822no effect during actions that do not perform compilation. 823 824.. option:: -Xassembler <arg> 825 826Pass <arg> to the assembler 827 828.. option:: -Xclang <arg> 829 830Pass <arg> to the clang compiler 831 832.. option:: -ansi, --ansi 833 834.. option:: -fc++-abi=<arg> 835 836C++ ABI to use. This will override the target C++ ABI. 837 838.. option:: -fclang-abi-compat=<version> 839 840Attempt to match the ABI of Clang <version> 841 842.. option:: -fcomment-block-commands=<arg>,<arg2>... 843 844Treat each comma separated argument in <arg> as a documentation comment block command 845 846.. option:: -fcomplete-member-pointers, -fno-complete-member-pointers 847 848Require member pointer base types to be complete if they would be significant under the Microsoft ABI 849 850.. option:: -fcrash-diagnostics-dir=<dir> 851 852Put crash-report files in <dir> 853 854.. option:: -fdeclspec, -fno-declspec 855 856Allow \_\_declspec as a keyword 857 858.. option:: -fdepfile-entry=<arg> 859 860.. option:: -fdiagnostics-fixit-info, -fno-diagnostics-fixit-info 861 862.. option:: -fdiagnostics-format=<arg> 863 864.. option:: -fdiagnostics-parseable-fixits 865 866Print fix-its in machine parseable form 867 868.. option:: -fdiagnostics-print-source-range-info 869 870Print source range spans in numeric form 871 872.. option:: -fdiagnostics-show-category=<arg> 873 874.. option:: -fdiscard-value-names, -fno-discard-value-names 875 876Discard value names in LLVM IR 877 878.. option:: -fexperimental-relative-c++-abi-vtables, -fno-experimental-relative-c++-abi-vtables 879 880Use the experimental C++ class ABI for classes with virtual tables 881 882.. option:: -fexperimental-strict-floating-point 883 884Enables experimental strict floating point in LLVM. 885 886.. option:: -ffine-grained-bitfield-accesses, -fno-fine-grained-bitfield-accesses 887 888Use separate accesses for consecutive bitfield runs with legal widths and alignments. 889 890.. option:: -fglobal-isel, -fexperimental-isel, -fno-global-isel 891 892Enables the global instruction selector 893 894.. option:: -finline-functions, -fno-inline-functions 895 896Inline suitable functions 897 898.. option:: -finline-hint-functions 899 900Inline functions which are (explicitly or implicitly) marked inline 901 902.. option:: -flegacy-pass-manager, -fno-experimental-new-pass-manager, -fno-legacy-pass-manager 903 904Use the legacy pass manager in LLVM (deprecated, to be removed in a future release) 905 906.. option:: -fno-crash-diagnostics 907 908Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash 909 910.. option:: -fno-sanitize-ignorelist, -fno-sanitize-blacklist 911 912Don't use ignorelist file for sanitizers 913 914.. option:: -fparse-all-comments 915 916.. option:: -frecord-command-line, -fno-record-command-line, -frecord-gcc-switches 917 918.. option:: -fsanitize-address-destructor=<arg> 919 920Set destructor type used in ASan instrumentation 921 922.. option:: -fsanitize-address-field-padding=<arg> 923 924Level of field padding for AddressSanitizer 925 926.. option:: -fsanitize-address-globals-dead-stripping 927 928Enable linker dead stripping of globals in AddressSanitizer 929 930.. option:: -fsanitize-address-outline-instrumentation, -fno-sanitize-address-outline-instrumentation 931 932Always generate function calls for address sanitizer instrumentation 933 934.. option:: -fsanitize-address-poison-custom-array-cookie, -fno-sanitize-address-poison-custom-array-cookie 935 936Enable poisoning array cookies when using custom operator new\[\] in AddressSanitizer 937 938.. option:: -fsanitize-address-use-after-return=<mode> 939 940Select the mode of detecting stack use-after-return in AddressSanitizer: never \| runtime (default) \| always 941 942.. option:: -fsanitize-address-use-after-scope, -fno-sanitize-address-use-after-scope 943 944Enable use-after-scope detection in AddressSanitizer 945 946.. option:: -fsanitize-address-use-odr-indicator, -fno-sanitize-address-use-odr-indicator 947 948Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size 949 950.. option:: -fsanitize-cfi-canonical-jump-tables, -fno-sanitize-cfi-canonical-jump-tables 951 952Make the jump table addresses canonical in the symbol table 953 954.. option:: -fsanitize-cfi-cross-dso, -fno-sanitize-cfi-cross-dso 955 956Enable control flow integrity (CFI) checks for cross-DSO calls. 957 958.. option:: -fsanitize-cfi-icall-generalize-pointers 959 960Generalize pointers in CFI indirect call type signature checks 961 962.. option:: -fsanitize-coverage-allowlist=<arg>, -fsanitize-coverage-whitelist=<arg> 963 964Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones 965 966.. option:: -fsanitize-coverage-ignorelist=<arg>, -fsanitize-coverage-blacklist=<arg> 967 968Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones 969 970.. option:: -fsanitize-coverage=<arg1>,<arg2>..., -fno-sanitize-coverage=<arg1>,<arg2>... 971 972Specify the type of coverage instrumentation for Sanitizers 973 974.. option:: -fsanitize-hwaddress-abi=<arg> 975 976Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused. 977 978.. option:: -fsanitize-hwaddress-experimental-aliasing, -fno-sanitize-hwaddress-experimental-aliasing 979 980Enable aliasing mode in HWAddressSanitizer 981 982.. option:: -fsanitize-ignorelist=<arg>, -fsanitize-blacklist=<arg> 983 984Path to ignorelist file for sanitizers 985 986.. option:: -fsanitize-link-c++-runtime, -fno-sanitize-link-c++-runtime 987 988.. option:: -fsanitize-link-runtime, -fno-sanitize-link-runtime 989 990.. option:: -fsanitize-memory-track-origins, -fno-sanitize-memory-track-origins 991 992Enable origins tracking in MemorySanitizer 993 994.. program:: clang1 995.. option:: -fsanitize-memory-track-origins=<arg> 996.. program:: clang 997 998Enable origins tracking in MemorySanitizer 999 1000.. option:: -fsanitize-memory-use-after-dtor, -fno-sanitize-memory-use-after-dtor 1001 1002Enable use-after-destroy detection in MemorySanitizer 1003 1004.. option:: -fsanitize-minimal-runtime, -fno-sanitize-minimal-runtime 1005 1006.. option:: -fsanitize-recover=<arg1>,<arg2>..., -fno-sanitize-recover=<arg1>,<arg2>..., -fsanitize-recover (equivalent to -fsanitize-recover=all) 1007 1008Enable recovery for specified sanitizers 1009 1010.. option:: -fsanitize-stats, -fno-sanitize-stats 1011 1012Enable sanitizer statistics gathering. 1013 1014.. option:: -fsanitize-thread-atomics, -fno-sanitize-thread-atomics 1015 1016Enable atomic operations instrumentation in ThreadSanitizer (default) 1017 1018.. option:: -fsanitize-thread-func-entry-exit, -fno-sanitize-thread-func-entry-exit 1019 1020Enable function entry/exit instrumentation in ThreadSanitizer (default) 1021 1022.. option:: -fsanitize-thread-memory-access, -fno-sanitize-thread-memory-access 1023 1024Enable memory access instrumentation in ThreadSanitizer (default) 1025 1026.. 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) 1027 1028Enable trapping for specified sanitizers 1029 1030.. option:: -fsanitize-undefined-strip-path-components=<number> 1031 1032Strip (or keep only, if negative) a given number of path components when emitting check metadata. 1033 1034.. option:: -fsanitize=<check>,<arg2>..., -fno-sanitize=<arg1>,<arg2>... 1035 1036Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks 1037 1038.. option:: -moutline, -mno-outline 1039 1040Enable function outlining (AArch64 only) 1041 1042.. option:: -moutline-atomics, -mno-outline-atomics 1043 1044Generate local calls to out-of-line atomic operations 1045 1046.. option:: --param <arg>, --param=<arg> 1047 1048.. option:: -print-supported-cpus, --print-supported-cpus, -mcpu=?, -mtune=? 1049 1050Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target) 1051 1052.. option:: -std=<arg>, --std=<arg>, --std <arg> 1053 1054Language standard to compile for 1055 1056Preprocessor flags 1057~~~~~~~~~~~~~~~~~~ 1058 1059Flags controlling the behavior of the Clang preprocessor. 1060 1061.. option:: -C, --comments 1062 1063Include comments in preprocessed output 1064 1065.. option:: -CC, --comments-in-macros 1066 1067Include comments from within macros in preprocessed output 1068 1069.. option:: -D<macro>=<value>, --define-macro <arg>, --define-macro=<arg> 1070 1071Define <macro> to <value> (or 1 if <value> omitted) 1072 1073.. option:: -H, --trace-includes 1074 1075Show header includes and nesting depth 1076 1077.. option:: -P, --no-line-commands 1078 1079Disable linemarker output in -E mode 1080 1081.. option:: -U<macro>, --undefine-macro <arg>, --undefine-macro=<arg> 1082 1083Undefine macro <macro> 1084 1085.. option:: -Wp,<arg>,<arg2>... 1086 1087Pass the comma separated arguments in <arg> to the preprocessor 1088 1089.. option:: -Xpreprocessor <arg> 1090 1091Pass <arg> to the preprocessor 1092 1093Include path management 1094----------------------- 1095 1096Flags controlling how ``#include``\s are resolved to files. 1097 1098.. option:: -I<dir>, --include-directory <arg>, --include-directory=<arg> 1099 1100Add directory to include search path. For C++ inputs, if 1101there are multiple -I options, these directories are searched 1102in the order they are given before the standard system directories 1103are searched. If the same directory is in the SYSTEM include search 1104paths, for example if also specified with -isystem, the -I option 1105will be ignored 1106 1107.. option:: -I-, --include-barrier 1108 1109Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path 1110 1111.. option:: --amdgpu-arch-tool=<arg> 1112 1113Tool used for detecting AMD GPU arch in the system. 1114 1115.. option:: --cuda-path-ignore-env 1116 1117Ignore environment variables to detect CUDA installation 1118 1119.. option:: --cuda-path=<arg> 1120 1121CUDA installation path 1122 1123.. option:: -cxx-isystem<directory> 1124 1125Add directory to the C++ SYSTEM include search path 1126 1127.. option:: -fbuild-session-file=<file> 1128 1129Use the last modification time of <file> as the build session timestamp 1130 1131.. option:: -fbuild-session-timestamp=<time since Epoch in seconds> 1132 1133Time when the current build session started 1134 1135.. option:: -fmodule-file=\[<name>=\]<file> 1136 1137Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. 1138 1139.. option:: -fmodules-cache-path=<directory> 1140 1141Specify the module cache path 1142 1143.. option:: -fmodules-disable-diagnostic-validation 1144 1145Disable validation of the diagnostic options when loading the module 1146 1147.. option:: -fmodules-prune-after=<seconds> 1148 1149Specify the interval (in seconds) after which a module file will be considered unused 1150 1151.. option:: -fmodules-prune-interval=<seconds> 1152 1153Specify the interval (in seconds) between attempts to prune the module cache 1154 1155.. option:: -fmodules-user-build-path <directory> 1156 1157Specify the module user build path 1158 1159.. option:: -fmodules-validate-once-per-build-session 1160 1161Don't verify input files for the modules if the module has been successfully validated or loaded during this build session 1162 1163.. option:: -fmodules-validate-system-headers, -fno-modules-validate-system-headers 1164 1165Validate the system headers that a module depends on when loading the module 1166 1167.. option:: -fprebuilt-module-path=<directory> 1168 1169Specify the prebuilt module path 1170 1171.. option:: --hip-path=<arg> 1172 1173HIP runtime installation path, used for finding HIP version and adding HIP include path. 1174 1175.. option:: -idirafter<arg>, --include-directory-after <arg>, --include-directory-after=<arg> 1176 1177Add directory to AFTER include search path 1178 1179.. option:: -iframework<arg> 1180 1181Add directory to SYSTEM framework search path 1182 1183.. option:: -iframeworkwithsysroot<directory> 1184 1185Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot 1186 1187.. option:: -imacros<file>, --imacros<file>, --imacros=<arg> 1188 1189Include macros from file before parsing 1190 1191.. option:: -include<file>, --include<file>, --include=<arg> 1192 1193Include file before parsing 1194 1195.. option:: -include-pch <file> 1196 1197Include precompiled header file 1198 1199.. option:: -iprefix<dir>, --include-prefix <arg>, --include-prefix=<arg> 1200 1201Set the -iwithprefix/-iwithprefixbefore prefix 1202 1203.. option:: -iquote<directory> 1204 1205Add directory to QUOTE include search path 1206 1207.. option:: -isysroot<dir> 1208 1209Set the system root directory (usually /) 1210 1211.. option:: -isystem<directory> 1212 1213Add directory to SYSTEM include search path 1214 1215.. option:: -isystem-after<directory> 1216 1217Add directory to end of the SYSTEM include search path 1218 1219.. option:: -ivfsoverlay<arg> 1220 1221Overlay the virtual filesystem described by file over the real file system 1222 1223.. option:: -iwithprefix<dir>, --include-with-prefix <arg>, --include-with-prefix-after <arg>, --include-with-prefix-after=<arg>, --include-with-prefix=<arg> 1224 1225Set directory to SYSTEM include search path with prefix 1226 1227.. option:: -iwithprefixbefore<dir>, --include-with-prefix-before <arg>, --include-with-prefix-before=<arg> 1228 1229Set directory to include search path with prefix 1230 1231.. option:: -iwithsysroot<directory> 1232 1233Add directory to SYSTEM include search path, absolute paths are relative to -isysroot 1234 1235.. option:: --libomptarget-amdgcn-bc-path=<arg> 1236 1237Path to libomptarget-amdgcn bitcode library 1238 1239.. option:: --libomptarget-nvptx-bc-path=<arg> 1240 1241Path to libomptarget-nvptx bitcode library 1242 1243.. option:: --ptxas-path=<arg> 1244 1245Path to ptxas (used for compiling CUDA code) 1246 1247.. option:: --rocm-path=<arg> 1248 1249ROCm installation path, used for finding and automatically linking required bitcode libraries. 1250 1251.. program:: clang1 1252.. option:: -stdlib++-isystem<directory> 1253.. program:: clang 1254 1255Use directory as the C++ standard library include path 1256 1257.. option:: --system-header-prefix=<prefix>, --no-system-header-prefix=<prefix>, --system-header-prefix <arg> 1258 1259Treat all #include paths starting with <prefix> as including a system header. 1260 1261Dependency file generation 1262-------------------------- 1263 1264Flags controlling generation of a dependency file for ``make``-like build 1265systems. 1266 1267.. option:: -M, --dependencies 1268 1269Like -MD, but also implies -E and writes to stdout by default 1270 1271.. option:: -MD, --write-dependencies 1272 1273Write a depfile containing user and system headers 1274 1275.. option:: -MF<file> 1276 1277Write depfile output from -MMD, -MD, -MM, or -M to <file> 1278 1279.. option:: -MG, --print-missing-file-dependencies 1280 1281Add missing headers to depfile 1282 1283.. option:: -MJ<arg> 1284 1285Write a compilation database entry per input 1286 1287.. option:: -MM, --user-dependencies 1288 1289Like -MMD, but also implies -E and writes to stdout by default 1290 1291.. option:: -MMD, --write-user-dependencies 1292 1293Write a depfile containing user headers 1294 1295.. option:: -MP 1296 1297Create phony target for each dependency (other than main file) 1298 1299.. option:: -MQ<arg> 1300 1301Specify name of main file output to quote in depfile 1302 1303.. option:: -MT<arg> 1304 1305Specify name of main file output in depfile 1306 1307.. option:: -MV 1308 1309Use NMake/Jom format for the depfile 1310 1311Dumping preprocessor state 1312-------------------------- 1313 1314Flags allowing the state of the preprocessor to be dumped in various ways. 1315 1316.. option:: -d 1317 1318.. program:: clang1 1319.. option:: -d<arg> 1320.. program:: clang 1321 1322.. option:: -dD 1323 1324Print macro definitions in -E mode in addition to normal output 1325 1326.. option:: -dI 1327 1328Print include directives in -E mode in addition to normal output 1329 1330.. option:: -dM 1331 1332Print macro definitions in -E mode instead of normal output 1333 1334Diagnostic flags 1335~~~~~~~~~~~~~~~~ 1336 1337Flags controlling which warnings, errors, and remarks Clang will generate. 1338See the :doc:`full list of warning and remark flags <DiagnosticsReference>`. 1339 1340.. option:: -R<remark> 1341 1342Enable the specified remark 1343 1344.. option:: -Rpass-analysis=<arg> 1345 1346Report transformation analysis from optimization passes whose name matches the given POSIX regular expression 1347 1348.. option:: -Rpass-missed=<arg> 1349 1350Report missed transformations by optimization passes whose name matches the given POSIX regular expression 1351 1352.. option:: -Rpass=<arg> 1353 1354Report transformations performed by optimization passes whose name matches the given POSIX regular expression 1355 1356.. option:: -W<warning>, --extra-warnings, --warn-<arg>, --warn-=<arg> 1357 1358Enable the specified warning 1359 1360.. option:: -Wdeprecated, -Wno-deprecated 1361 1362Enable warnings for deprecated constructs and define \_\_DEPRECATED 1363 1364.. option:: -Wframe-larger-than=<arg>, -Wframe-larger-than 1365 1366.. option:: -Wnonportable-cfstrings<arg>, -Wno-nonportable-cfstrings<arg> 1367 1368Target-independent compilation options 1369~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1370.. option:: -fPIC, -fno-PIC 1371 1372.. option:: -fPIE, -fno-PIE 1373 1374.. option:: -faccess-control, -fno-access-control 1375 1376.. option:: -faddrsig, -fno-addrsig 1377 1378Emit an address-significance table 1379 1380.. option:: -falign-functions, -fno-align-functions 1381 1382.. program:: clang1 1383.. option:: -falign-functions=<arg> 1384.. program:: clang 1385 1386.. option:: -falign-loops=<N> 1387 1388N must be a power of two. Align loops to the boundary 1389 1390.. program:: clang1 1391.. option:: -faligned-allocation, -faligned-new, -fno-aligned-allocation 1392.. program:: clang 1393 1394Enable C++17 aligned allocation functions 1395 1396.. option:: -fallow-editor-placeholders, -fno-allow-editor-placeholders 1397 1398Treat editor placeholders as valid source code 1399 1400.. option:: -fallow-unsupported 1401 1402.. option:: -faltivec, -fno-altivec 1403 1404.. option:: -faltivec-src-compat=<arg> 1405 1406Source-level compatibility for Altivec vectors (for PowerPC targets). This includes results of vector comparison (scalar for 'xl', vector for 'gcc') as well as behavior when initializing with a scalar (splatting for 'xl', element zero only for 'gcc'). For 'mixed', the compatibility is as 'gcc' for 'vector bool/vector pixel' and as 'xl' for other types. Current default is 'mixed'. 1407 1408.. option:: -fansi-escape-codes 1409 1410Use ANSI escape codes for diagnostics 1411 1412.. option:: -fapple-kext, -findirect-virtual-calls, -fterminated-vtables 1413 1414Use Apple's kernel extensions ABI 1415 1416.. option:: -fapple-link-rtlib 1417 1418Force linking the clang builtins runtime library 1419 1420.. option:: -fapple-pragma-pack, -fno-apple-pragma-pack 1421 1422Enable Apple gcc-compatible #pragma pack handling 1423 1424.. option:: -fapplication-extension, -fno-application-extension 1425 1426Restrict code to those available for App Extensions 1427 1428.. option:: -fapprox-func, -fno-approx-func 1429 1430Allow certain math function calls to be replaced with an approximately equivalent calculation 1431 1432.. option:: -fasm, -fno-asm 1433 1434.. option:: -fasm-blocks, -fno-asm-blocks 1435 1436.. option:: -fassociative-math, -fno-associative-math 1437 1438.. option:: -fassume-sane-operator-new, -fno-assume-sane-operator-new 1439 1440.. option:: -fast 1441 1442.. option:: -fastcp 1443 1444.. option:: -fastf 1445 1446.. option:: -fasync-exceptions, -fno-async-exceptions 1447 1448Enable EH Asynchronous exceptions 1449 1450.. option:: -fasynchronous-unwind-tables, -fno-asynchronous-unwind-tables 1451 1452.. option:: -fautolink, -fno-autolink 1453 1454.. option:: -fbasic-block-sections=<arg> 1455 1456Generate labels for each basic block or place each basic block or a subset of basic blocks in its own section. 1457 1458.. option:: -fbinutils-version=<major.minor> 1459 1460Produced object files can use all ELF features supported by this binutils version and newer. If -fno-integrated-as is specified, the generated assembly will consider GNU as support. 'none' means that all ELF features can be used, regardless of binutils support. Defaults to 2.26. 1461 1462.. option:: -fblocks, -fno-blocks 1463 1464Enable the 'blocks' language feature 1465 1466.. option:: -fbootclasspath=<arg>, --bootclasspath <arg>, --bootclasspath=<arg> 1467 1468.. option:: -fborland-extensions, -fno-borland-extensions 1469 1470Accept non-standard constructs supported by the Borland compiler 1471 1472.. option:: -fbracket-depth=<arg> 1473 1474.. option:: -fbuiltin, -fno-builtin 1475 1476.. option:: -fbuiltin-module-map 1477 1478Load the clang builtins module map file. 1479 1480.. program:: clang1 1481.. option:: -fc++-static-destructors, -fno-c++-static-destructors 1482.. program:: clang 1483 1484.. option:: -fcaret-diagnostics, -fno-caret-diagnostics 1485 1486.. option:: -fcf-protection=<arg>, -fcf-protection (equivalent to -fcf-protection=full) 1487 1488Instrument control-flow architecture protection. Options: return, branch, full, none. 1489 1490.. option:: -fcf-runtime-abi=<arg> 1491 1492.. option:: -fchar8\_t, -fno-char8\_t 1493 1494Enable C++ builtin type char8\_t 1495 1496.. option:: -fclasspath=<arg>, --CLASSPATH <arg>, --CLASSPATH=<arg>, --classpath <arg>, --classpath=<arg> 1497 1498.. option:: -fcolor-diagnostics, -fno-color-diagnostics 1499 1500Enable colors in diagnostics 1501 1502.. option:: -fcommon, -fno-common 1503 1504Place uninitialized global variables in a common block 1505 1506.. option:: -fcompile-resource=<arg>, --resource <arg>, --resource=<arg> 1507 1508.. option:: -fconstant-cfstrings, -fno-constant-cfstrings 1509 1510.. option:: -fconstant-string-class=<arg> 1511 1512.. option:: -fconstexpr-backtrace-limit=<arg> 1513 1514.. option:: -fconstexpr-depth=<arg> 1515 1516.. option:: -fconstexpr-steps=<arg> 1517 1518.. option:: -fconvergent-functions 1519 1520Assume functions may be convergent 1521 1522.. option:: -fcoroutines-ts, -fno-coroutines-ts 1523 1524Enable support for the C++ Coroutines TS 1525 1526.. option:: -fcoverage-compilation-dir=<arg> 1527 1528The compilation directory to embed in the coverage mapping. 1529 1530.. option:: -fcoverage-mapping, -fno-coverage-mapping 1531 1532Generate coverage mapping to enable code coverage analysis 1533 1534.. option:: -fcoverage-prefix-map=<arg> 1535 1536remap file source paths in coverage mapping 1537 1538.. option:: -fcreate-profile 1539 1540.. option:: -fcs-profile-generate 1541 1542Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1543 1544.. program:: clang1 1545.. option:: -fcs-profile-generate=<directory> 1546.. program:: clang 1547 1548Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 1549 1550.. option:: -fcuda-approx-transcendentals, -fno-cuda-approx-transcendentals 1551 1552Use approximate transcendental functions 1553 1554.. option:: -fcuda-short-ptr, -fno-cuda-short-ptr 1555 1556Use 32-bit pointers for accessing const/local/shared address spaces 1557 1558.. option:: -fcxx-exceptions, -fno-cxx-exceptions 1559 1560Enable C++ exceptions 1561 1562.. option:: -fcxx-modules, -fno-cxx-modules 1563 1564Enable modules for C++ 1565 1566.. option:: -fdata-sections, -fno-data-sections 1567 1568Place each data in its own section 1569 1570.. option:: -fdebug-compilation-dir=<arg>, -fdebug-compilation-dir <arg> 1571 1572The compilation directory to embed in the debug info 1573 1574.. option:: -fdebug-default-version=<arg> 1575 1576Default DWARF version to use, if a -g option caused DWARF debug info to be produced 1577 1578.. option:: -fdebug-info-for-profiling, -fno-debug-info-for-profiling 1579 1580Emit extra debug info to make sample profile more accurate 1581 1582.. option:: -fdebug-macro, -fno-debug-macro 1583 1584Emit macro debug information 1585 1586.. option:: -fdebug-pass-arguments 1587 1588.. option:: -fdebug-pass-structure 1589 1590.. option:: -fdebug-prefix-map=<arg> 1591 1592remap file source paths in debug info 1593 1594.. option:: -fdebug-ranges-base-address, -fno-debug-ranges-base-address 1595 1596Use DWARF base address selection entries in .debug\_ranges 1597 1598.. option:: -fdebug-types-section, -fno-debug-types-section 1599 1600Place debug types in their own section (ELF Only) 1601 1602.. option:: -fdelayed-template-parsing, -fno-delayed-template-parsing 1603 1604Parse templated function definitions at the end of the translation unit 1605 1606.. option:: -fdelete-null-pointer-checks, -fno-delete-null-pointer-checks 1607 1608Treat usage of null pointers as undefined behavior (default) 1609 1610.. option:: -fdenormal-fp-math=<arg> 1611 1612.. option:: -fdiagnostics-absolute-paths 1613 1614Print absolute paths in diagnostics 1615 1616.. option:: -fdiagnostics-color, -fno-diagnostics-color 1617 1618.. program:: clang1 1619.. option:: -fdiagnostics-color=<arg> 1620.. program:: clang 1621 1622.. option:: -fdiagnostics-hotness-threshold=<value> 1623 1624Prevent optimization remarks from being output if they do not have at least this profile count. Use 'auto' to apply the threshold from profile summary 1625 1626.. option:: -fdiagnostics-show-hotness, -fno-diagnostics-show-hotness 1627 1628Enable profile hotness information in diagnostic line 1629 1630.. option:: -fdiagnostics-show-note-include-stack, -fno-diagnostics-show-note-include-stack 1631 1632Display include stacks for diagnostic notes 1633 1634.. option:: -fdiagnostics-show-option, -fno-diagnostics-show-option 1635 1636Print option name with mappable diagnostics 1637 1638.. option:: -fdiagnostics-show-template-tree 1639 1640Print a template comparison tree for differing templates 1641 1642.. option:: -fdigraphs, -fno-digraphs 1643 1644Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) 1645 1646.. option:: -fdirect-access-external-data, -fno-direct-access-external-data 1647 1648Don't use GOT indirection to reference external data symbols 1649 1650.. option:: -fdollars-in-identifiers, -fno-dollars-in-identifiers 1651 1652Allow '$' in identifiers 1653 1654.. option:: -fdouble-square-bracket-attributes, -fno-double-square-bracket-attributes 1655 1656Enable '\[\[\]\]' attributes in all C and C++ language modes 1657 1658.. option:: -fdwarf-directory-asm, -fno-dwarf-directory-asm 1659 1660.. option:: -fdwarf-exceptions 1661 1662Use DWARF style exceptions 1663 1664.. option:: -felide-constructors, -fno-elide-constructors 1665 1666.. option:: -feliminate-unused-debug-symbols, -fno-eliminate-unused-debug-symbols 1667 1668.. option:: -feliminate-unused-debug-types, -fno-eliminate-unused-debug-types 1669 1670Do not emit debug info for defined but unused types 1671 1672.. option:: -fembed-bitcode=<option>, -fembed-bitcode (equivalent to -fembed-bitcode=all), -fembed-bitcode-marker (equivalent to -fembed-bitcode=marker) 1673 1674Embed LLVM bitcode (option: off, all, bitcode, marker) 1675 1676.. option:: -femit-all-decls 1677 1678Emit all declarations, even if unused 1679 1680.. option:: -femulated-tls, -fno-emulated-tls 1681 1682Use emutls functions to access thread\_local variables 1683 1684.. option:: -fenable-matrix 1685 1686Enable matrix data type and related builtin functions 1687 1688.. option:: -fencoding=<arg>, --encoding <arg>, --encoding=<arg> 1689 1690.. option:: -ferror-limit=<arg> 1691 1692.. option:: -fescaping-block-tail-calls, -fno-escaping-block-tail-calls 1693 1694.. option:: -fexceptions, -fno-exceptions 1695 1696Enable support for exception handling 1697 1698.. option:: -fexec-charset=<arg> 1699 1700.. option:: -fexperimental-new-constant-interpreter 1701 1702Enable the experimental new constant interpreter 1703 1704.. option:: -fextdirs=<arg>, --extdirs <arg>, --extdirs=<arg> 1705 1706.. option:: -fextend-arguments=<arg> 1707 1708Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions 1709 1710.. option:: -ffast-math, -fno-fast-math 1711 1712Allow aggressive, lossy floating-point optimizations 1713 1714.. option:: -ffile-compilation-dir=<arg> 1715 1716The compilation directory to embed in the debug info and coverage mapping. 1717 1718.. option:: -ffile-prefix-map=<arg> 1719 1720remap file source paths in debug info, predefined preprocessor macros and \_\_builtin\_FILE() 1721 1722.. option:: -ffinite-loops, -fno-finite-loops 1723 1724Assume all loops are finite. 1725 1726.. option:: -ffinite-math-only, -fno-finite-math-only 1727 1728.. option:: -ffixed-point, -fno-fixed-point 1729 1730Enable fixed point types 1731 1732.. option:: -ffor-scope, -fno-for-scope 1733 1734.. option:: -fforce-dwarf-frame, -fno-force-dwarf-frame 1735 1736Always emit a debug frame section 1737 1738.. option:: -fforce-emit-vtables, -fno-force-emit-vtables 1739 1740Emits more virtual tables to improve devirtualization 1741 1742.. option:: -fforce-enable-int128, -fno-force-enable-int128 1743 1744Enable support for int128\_t type 1745 1746.. option:: -ffp-contract=<arg> 1747 1748Form fused FP ops (e.g. FMAs): fast (fuses across statements disregarding pragmas) \| on (only fuses in the same statement unless dictated by pragmas) \| off (never fuses) \| fast-honor-pragmas (fuses across statements unless diectated by pragmas). Default is 'fast' for CUDA, 'fast-honor-pragmas' for HIP, and 'on' otherwise. 1749 1750.. option:: -ffp-exception-behavior=<arg> 1751 1752Specifies the exception behavior of floating-point operations. 1753 1754.. option:: -ffp-model=<arg> 1755 1756Controls the semantics of floating-point calculations. 1757 1758.. option:: -ffreestanding 1759 1760Assert that the compilation takes place in a freestanding environment 1761 1762.. option:: -ffunction-sections, -fno-function-sections 1763 1764Place each function in its own section 1765 1766.. option:: -fgnu-inline-asm, -fno-gnu-inline-asm 1767 1768.. option:: -fgnu-keywords, -fno-gnu-keywords 1769 1770Allow GNU-extension keywords regardless of language standard 1771 1772.. option:: -fgnu-runtime 1773 1774Generate output compatible with the standard GNU Objective-C runtime 1775 1776.. option:: -fgnu89-inline, -fno-gnu89-inline 1777 1778Use the gnu89 inline semantics 1779 1780.. option:: -fgnuc-version=<arg> 1781 1782Sets various macros to claim compatibility with the given GCC version (default is 4.2.1) 1783 1784.. option:: -fgpu-allow-device-init, -fno-gpu-allow-device-init 1785 1786Allow device side init function in HIP (experimental) 1787 1788.. option:: -fgpu-defer-diag, -fno-gpu-defer-diag 1789 1790Defer host/device related diagnostic messages for CUDA/HIP 1791 1792.. option:: -fgpu-rdc, -fcuda-rdc, -fno-gpu-rdc 1793 1794Generate relocatable device code, also known as separate compilation mode 1795 1796.. option:: -fgpu-sanitize, -fno-gpu-sanitize 1797 1798Enable sanitizer for AMDGPU target 1799 1800.. option:: -fhip-fp32-correctly-rounded-divide-sqrt, -fno-hip-fp32-correctly-rounded-divide-sqrt 1801 1802Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only) 1803 1804.. option:: -fhip-new-launch-api, -fno-hip-new-launch-api 1805 1806Use new kernel launching API for HIP 1807 1808.. option:: -fhonor-infinities, -fhonor-infinites, -fno-honor-infinities 1809 1810.. option:: -fhonor-nans, -fno-honor-nans 1811 1812.. option:: -fhosted 1813 1814.. option:: -fignore-exceptions 1815 1816Enable support for ignoring exception handling constructs 1817 1818.. option:: -fimplicit-module-maps, -fmodule-maps, -fno-implicit-module-maps 1819 1820Implicitly search the file system for module map files. 1821 1822.. option:: -fimplicit-modules, -fno-implicit-modules 1823 1824.. option:: -finput-charset=<arg> 1825 1826Specify the default character set for source files 1827 1828.. option:: -finstrument-function-entry-bare 1829 1830Instrument function entry only, after inlining, without arguments to the instrumentation call 1831 1832.. option:: -finstrument-functions 1833 1834Generate calls to instrument function entry and exit 1835 1836.. option:: -finstrument-functions-after-inlining 1837 1838Like -finstrument-functions, but insert the calls after inlining 1839 1840.. option:: -fintegrated-as, -fno-integrated-as, -integrated-as 1841 1842Enable the integrated assembler 1843 1844.. option:: -fintegrated-cc1, -fno-integrated-cc1 1845 1846Run cc1 in-process 1847 1848.. option:: -fjump-tables, -fno-jump-tables 1849 1850Use jump tables for lowering switches 1851 1852.. option:: -fkeep-static-consts, -fno-keep-static-consts 1853 1854Keep static const variables if unused 1855 1856.. option:: -flax-vector-conversions=<arg>, -flax-vector-conversions (equivalent to -flax-vector-conversions=integer), -fno-lax-vector-conversions (equivalent to -flax-vector-conversions=none) 1857 1858Enable implicit vector bit-casts 1859 1860.. option:: -flimited-precision=<arg> 1861 1862.. option:: -flto-jobs=<arg> 1863 1864Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) 1865 1866.. option:: -flto=<arg>, -flto (equivalent to -flto=full), -flto=auto (equivalent to -flto=full), -flto=jobserver (equivalent to -flto=full) 1867 1868Set LTO mode to either 'full' or 'thin' 1869 1870.. option:: -fmacro-backtrace-limit=<arg> 1871 1872.. option:: -fmacro-prefix-map=<arg> 1873 1874remap file source paths in predefined preprocessor macros and \_\_builtin\_FILE() 1875 1876.. option:: -fmath-errno, -fno-math-errno 1877 1878Require math functions to indicate errors by setting errno 1879 1880.. option:: -fmax-tokens=<arg> 1881 1882Max total number of preprocessed tokens for -Wmax-tokens. 1883 1884.. option:: -fmax-type-align=<arg> 1885 1886Specify the maximum alignment to enforce on pointers lacking an explicit alignment 1887 1888.. option:: -fmemory-profile, -fno-memory-profile 1889 1890Enable heap memory profiling 1891 1892.. program:: clang1 1893.. option:: -fmemory-profile=<directory> 1894.. program:: clang 1895 1896Enable heap memory profiling and dump results into <directory> 1897 1898.. option:: -fmerge-all-constants, -fno-merge-all-constants 1899 1900Allow merging of constants 1901 1902.. option:: -fmessage-length=<arg> 1903 1904Format message diagnostics so that they fit within N columns 1905 1906.. option:: -fminimize-whitespace, -fno-minimize-whitespace 1907 1908Minimize whitespace when emitting preprocessor output 1909 1910.. option:: -fmodule-file-deps, -fno-module-file-deps 1911 1912.. option:: -fmodule-map-file=<file> 1913 1914Load this module map file 1915 1916.. option:: -fmodule-name=<name>, -fmodule-implementation-of <arg> 1917 1918Specify the name of the module to build 1919 1920.. option:: -fmodules, -fno-modules 1921 1922Enable the 'modules' language feature 1923 1924.. option:: -fmodules-decluse, -fno-modules-decluse 1925 1926Require declaration of modules used within a module 1927 1928.. option:: -fmodules-ignore-macro=<arg> 1929 1930Ignore the definition of the given macro when building and loading modules 1931 1932.. option:: -fmodules-search-all, -fno-modules-search-all 1933 1934Search even non-imported modules to resolve references 1935 1936.. option:: -fmodules-strict-decluse 1937 1938Like -fmodules-decluse but requires all headers to be in modules 1939 1940.. option:: -fmodules-ts 1941 1942Enable support for the C++ Modules TS 1943 1944.. option:: -fmodules-validate-input-files-content 1945 1946Validate PCM input files based on content if mtime differs 1947 1948.. option:: -fms-compatibility, -fno-ms-compatibility 1949 1950Enable full Microsoft Visual C++ compatibility 1951 1952.. option:: -fms-compatibility-version=<arg> 1953 1954Dot-separated value representing the Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1955 1956.. option:: -fms-extensions, -fno-ms-extensions 1957 1958Accept some non-standard constructs supported by the Microsoft compiler 1959 1960.. option:: -fms-memptr-rep=<arg> 1961 1962.. option:: -fms-volatile 1963 1964.. option:: -fmsc-version=<arg> 1965 1966Microsoft compiler version number to report in \_MSC\_VER (0 = don't define it (default)) 1967 1968.. option:: -fmudflap 1969 1970.. option:: -fmudflapth 1971 1972.. option:: -fnested-functions 1973 1974.. option:: -fnew-alignment=<align>, -fnew-alignment <arg> 1975 1976Specifies the largest alignment guaranteed by '::operator new(size\_t)' 1977 1978.. option:: -fnew-infallible, -fno-new-infallible 1979 1980Enable treating throwing global C++ operator new as always returning valid memory (annotates with \_\_attribute\_\_((returns\_nonnull)) and throw()). This is detectable in source. 1981 1982.. option:: -fnext-runtime 1983 1984.. option:: -fno-builtin-<arg> 1985 1986Disable implicit builtin knowledge of a specific function 1987 1988.. option:: -fno-elide-type 1989 1990Do not elide types when printing diagnostics 1991 1992.. option:: -fno-max-type-align 1993 1994.. option:: -fno-strict-modules-decluse 1995 1996.. option:: -fno-temp-file 1997 1998Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes 1999 2000.. option:: -fno-working-directory 2001 2002.. option:: -fno\_modules-validate-input-files-content 2003 2004.. program:: clang1 2005.. option:: -fno\_pch-validate-input-files-content 2006.. program:: clang 2007 2008.. option:: -fnoxray-link-deps 2009 2010.. option:: -fobjc-abi-version=<arg> 2011 2012.. option:: -fobjc-arc, -fno-objc-arc 2013 2014Synthesize retain and release calls for Objective-C pointers 2015 2016.. option:: -fobjc-arc-exceptions, -fno-objc-arc-exceptions 2017 2018Use EH-safe code when synthesizing retains and releases in -fobjc-arc 2019 2020.. option:: -fobjc-convert-messages-to-runtime-calls, -fno-objc-convert-messages-to-runtime-calls 2021 2022.. option:: -fobjc-disable-direct-methods-for-testing 2023 2024Ignore attribute objc\_direct so that direct methods can be tested 2025 2026.. option:: -fobjc-encode-cxx-class-template-spec, -fno-objc-encode-cxx-class-template-spec 2027 2028Fully encode c++ class template specialization 2029 2030.. option:: -fobjc-exceptions, -fno-objc-exceptions 2031 2032Enable Objective-C exceptions 2033 2034.. option:: -fobjc-infer-related-result-type, -fno-objc-infer-related-result-type 2035 2036.. option:: -fobjc-legacy-dispatch, -fno-objc-legacy-dispatch 2037 2038.. option:: -fobjc-link-runtime 2039 2040.. option:: -fobjc-nonfragile-abi, -fno-objc-nonfragile-abi 2041 2042.. option:: -fobjc-nonfragile-abi-version=<arg> 2043 2044.. option:: -fobjc-runtime=<arg> 2045 2046Specify the target Objective-C runtime kind and version 2047 2048.. option:: -fobjc-sender-dependent-dispatch 2049 2050.. option:: -fobjc-weak, -fno-objc-weak 2051 2052Enable ARC-style weak references in Objective-C 2053 2054.. option:: -foffload-lto=<arg>, -foffload-lto (equivalent to -foffload-lto=full) 2055 2056Set LTO mode to either 'full' or 'thin' for offload compilation 2057 2058.. option:: -fomit-frame-pointer, -fno-omit-frame-pointer 2059 2060.. option:: -fopenmp, -fno-openmp 2061 2062Parse OpenMP pragmas and generate parallel code. 2063 2064.. option:: -fopenmp-extensions, -fno-openmp-extensions 2065 2066Enable all Clang extensions for OpenMP directives and clauses 2067 2068.. option:: -fopenmp-simd, -fno-openmp-simd 2069 2070Emit OpenMP code only for SIMD-based constructs. 2071 2072.. option:: -fopenmp-target-debug, -fno-openmp-target-debug 2073 2074Enable debugging in the OpenMP offloading device RTL 2075 2076.. option:: -fopenmp-target-new-runtime, -fno-openmp-target-new-runtime 2077 2078Use the new bitcode library for OpenMP offloading 2079 2080.. option:: -fopenmp-version=<arg> 2081 2082Set OpenMP version (e.g. 45 for OpenMP 4.5, 50 for OpenMP 5.0). Default value is 50. 2083 2084.. program:: clang1 2085.. option:: -fopenmp=<arg> 2086.. program:: clang 2087 2088.. option:: -foperator-arrow-depth=<arg> 2089 2090.. option:: -foperator-names, -fno-operator-names 2091 2092.. option:: -foptimization-record-file=<file> 2093 2094Specify 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. 2095 2096.. option:: -foptimization-record-passes=<regex> 2097 2098Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) 2099 2100.. option:: -foptimize-sibling-calls, -fno-optimize-sibling-calls 2101 2102.. option:: -forder-file-instrumentation 2103 2104Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 2105 2106.. option:: -foutput-class-dir=<arg>, --output-class-directory <arg>, --output-class-directory=<arg> 2107 2108.. option:: -fpack-struct, -fno-pack-struct 2109 2110.. program:: clang1 2111.. option:: -fpack-struct=<arg> 2112.. program:: clang 2113 2114Specify the default maximum struct packing alignment 2115 2116.. option:: -fpascal-strings, -fno-pascal-strings, -mpascal-strings 2117 2118Recognize and construct Pascal-style string literals 2119 2120.. option:: -fpass-plugin=<dsopath> 2121 2122Load pass plugin from a dynamic shared object file (only with new pass manager). 2123 2124.. option:: -fpatchable-function-entry=<N,M> 2125 2126Generate M NOPs before function entry and N-M NOPs after function entry 2127 2128.. option:: -fpcc-struct-return 2129 2130Override the default ABI to return all structs on the stack 2131 2132.. option:: -fpch-codegen, -fno-pch-codegen 2133 2134Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH 2135 2136.. option:: -fpch-debuginfo, -fno-pch-debuginfo 2137 2138Generate debug info for types in an object file built from this PCH and do not generate them elsewhere 2139 2140.. option:: -fpch-instantiate-templates, -fno-pch-instantiate-templates 2141 2142Instantiate templates already while building a PCH 2143 2144.. option:: -fpch-preprocess 2145 2146.. option:: -fpch-validate-input-files-content 2147 2148Validate PCH input files based on content if mtime differs 2149 2150.. option:: -fpic, -fno-pic 2151 2152.. option:: -fpie, -fno-pie 2153 2154.. option:: -fplt, -fno-plt 2155 2156.. option:: -fplugin=<dsopath> 2157 2158Load the named plugin (dynamic shared object) 2159 2160.. option:: -fprebuilt-implicit-modules, -fno-prebuilt-implicit-modules 2161 2162Look up implicit modules in the prebuilt module path 2163 2164.. option:: -fpreserve-as-comments, -fno-preserve-as-comments 2165 2166.. option:: -fproc-stat-report<arg> 2167 2168Print subprocess statistics 2169 2170.. program:: clang1 2171.. option:: -fproc-stat-report=<arg> 2172.. program:: clang 2173 2174Save subprocess statistics to the given file 2175 2176.. option:: -fprofile-arcs, -fno-profile-arcs 2177 2178.. option:: -fprofile-dir=<arg> 2179 2180.. option:: -fprofile-exclude-files=<arg> 2181 2182Instrument only functions from files where names don't match all the regexes separated by a semi-colon 2183 2184.. option:: -fprofile-filter-files=<arg> 2185 2186Instrument only functions from files where names match any regex separated by a semi-colon 2187 2188.. option:: -fprofile-generate, -fno-profile-generate 2189 2190Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 2191 2192.. program:: clang1 2193.. option:: -fprofile-generate=<directory> 2194.. program:: clang 2195 2196Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM\_PROFILE\_FILE env var) 2197 2198.. option:: -fprofile-instr-generate, -fno-profile-instr-generate 2199 2200Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM\_PROFILE\_FILE env var) 2201 2202.. program:: clang1 2203.. option:: -fprofile-instr-generate=<file> 2204.. program:: clang 2205 2206Generate instrumented code to collect execution counts into <file> (overridden by LLVM\_PROFILE\_FILE env var) 2207 2208.. option:: -fprofile-instr-use, -fno-profile-instr-use, -fprofile-use 2209 2210.. program:: clang1 2211.. option:: -fprofile-instr-use=<arg> 2212.. program:: clang 2213 2214Use instrumentation data for profile-guided optimization 2215 2216.. option:: -fprofile-list=<arg> 2217 2218Filename defining the list of functions/files to instrument 2219 2220.. option:: -fprofile-remapping-file=<file> 2221 2222Use the remappings described in <file> to match the profile data against names in the program 2223 2224.. option:: -fprofile-sample-accurate, -fauto-profile-accurate, -fno-profile-sample-accurate 2225 2226Specifies that the sample profile is accurate. If the sample 2227 profile is accurate, callsites without profile samples are marked 2228 as cold. Otherwise, treat callsites without profile samples as if 2229 we have no profile 2230 2231.. option:: -fprofile-sample-use, -fauto-profile, -fno-profile-sample-use 2232 2233.. program:: clang1 2234.. option:: -fprofile-sample-use=<arg>, -fauto-profile=<arg> 2235.. program:: clang 2236 2237Enable sample-based profile guided optimizations 2238 2239.. option:: -fprofile-update=<method> 2240 2241Set update method of profile counters (atomic,prefer-atomic,single) 2242 2243.. program:: clang1 2244.. option:: -fprofile-use=<pathname> 2245.. program:: clang 2246 2247Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>. 2248 2249.. option:: -fprotect-parens, -fno-protect-parens 2250 2251Determines whether the optimizer honors parentheses when floating-point expressions are evaluated 2252 2253.. option:: -fpseudo-probe-for-profiling, -fno-pseudo-probe-for-profiling 2254 2255Emit pseudo probes for sample profiling 2256 2257.. option:: -freciprocal-math, -fno-reciprocal-math 2258 2259Allow division operations to be reassociated 2260 2261.. option:: -freg-struct-return 2262 2263Override the default ABI to return small structs in registers 2264 2265.. option:: -fregister-global-dtors-with-atexit, -fno-register-global-dtors-with-atexit 2266 2267Use atexit or \_\_cxa\_atexit to register global destructors 2268 2269.. option:: -frelaxed-template-template-args, -fno-relaxed-template-template-args 2270 2271Enable C++17 relaxed template template argument matching 2272 2273.. option:: -freroll-loops, -fno-reroll-loops 2274 2275Turn on loop reroller 2276 2277.. option:: -fretain-comments-from-system-headers 2278 2279.. option:: -frewrite-imports, -fno-rewrite-imports 2280 2281.. option:: -frewrite-includes, -fno-rewrite-includes 2282 2283.. option:: -frewrite-map-file=<arg> 2284 2285.. option:: -fropi, -fno-ropi 2286 2287Generate read-only position independent code (ARM only) 2288 2289.. option:: -frounding-math, -fno-rounding-math 2290 2291.. option:: -frtti, -fno-rtti 2292 2293.. option:: -frtti-data, -fno-rtti-data 2294 2295.. option:: -frwpi, -fno-rwpi 2296 2297Generate read-write position independent code (ARM only) 2298 2299.. option:: -fsave-optimization-record, -fno-save-optimization-record 2300 2301Generate a YAML optimization record file 2302 2303.. program:: clang1 2304.. option:: -fsave-optimization-record=<format> 2305.. program:: clang 2306 2307Generate an optimization record file in a specific format 2308 2309.. option:: -fseh-exceptions 2310 2311Use SEH style exceptions 2312 2313.. option:: -fsemantic-interposition, -fno-semantic-interposition 2314 2315.. option:: -fshort-enums, -fno-short-enums 2316 2317Allocate to an enum type only as many bytes as it needs for the declared range of possible values 2318 2319.. option:: -fshort-wchar, -fno-short-wchar 2320 2321Force wchar\_t to be a short unsigned int 2322 2323.. option:: -fshow-column, -fno-show-column 2324 2325.. option:: -fshow-overloads=<arg> 2326 2327Which overload candidates to show when overload resolution fails: best\|all; defaults to all 2328 2329.. option:: -fshow-source-location, -fno-show-source-location 2330 2331.. option:: -fsignaling-math, -fno-signaling-math 2332 2333.. option:: -fsigned-bitfields 2334 2335.. option:: -fsigned-char, -fno-signed-char, --signed-char 2336 2337char is signed 2338 2339.. option:: -fsigned-zeros, -fno-signed-zeros 2340 2341.. option:: -fsized-deallocation, -fno-sized-deallocation 2342 2343Enable C++14 sized global deallocation functions 2344 2345.. option:: -fsjlj-exceptions 2346 2347Use SjLj style exceptions 2348 2349.. option:: -fslp-vectorize, -fno-slp-vectorize, -ftree-slp-vectorize 2350 2351Enable the superword-level parallelism vectorization passes 2352 2353.. option:: -fspell-checking, -fno-spell-checking 2354 2355.. option:: -fspell-checking-limit=<arg> 2356 2357.. option:: -fsplit-dwarf-inlining, -fno-split-dwarf-inlining 2358 2359Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF 2360 2361.. option:: -fsplit-lto-unit, -fno-split-lto-unit 2362 2363Enables splitting of the LTO unit 2364 2365.. option:: -fsplit-machine-functions, -fno-split-machine-functions 2366 2367Enable late function splitting using profile information (x86 ELF) 2368 2369.. option:: -fsplit-stack, -fno-split-stack 2370 2371Use segmented stack 2372 2373.. option:: -fstack-clash-protection, -fno-stack-clash-protection 2374 2375Enable stack clash protection 2376 2377.. option:: -fstack-protector, -fno-stack-protector 2378 2379Enable 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. 2380 2381.. option:: -fstack-protector-all 2382 2383Enable stack protectors for all functions 2384 2385.. option:: -fstack-protector-strong 2386 2387Enable 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 2388 2389.. option:: -fstack-size-section, -fno-stack-size-section 2390 2391Emit section containing metadata on function stack sizes 2392 2393.. option:: -fstack-usage 2394 2395Emit .su file containing information on function stack sizes 2396 2397.. option:: -fstandalone-debug, -fno-limit-debug-info, -fno-standalone-debug 2398 2399Emit full debug info for all types used by the program 2400 2401.. option:: -fstrict-aliasing, -fno-strict-aliasing 2402 2403.. option:: -fstrict-enums, -fno-strict-enums 2404 2405Enable optimizations based on the strict definition of an enum's value range 2406 2407.. option:: -fstrict-float-cast-overflow, -fno-strict-float-cast-overflow 2408 2409Assume that overflowing float-to-int casts are undefined (default) 2410 2411.. option:: -fstrict-overflow, -fno-strict-overflow 2412 2413.. option:: -fstrict-return, -fno-strict-return 2414 2415.. option:: -fstrict-vtable-pointers, -fno-strict-vtable-pointers 2416 2417Enable optimizations based on the strict rules for overwriting polymorphic C++ objects 2418 2419.. option:: -fstruct-path-tbaa, -fno-struct-path-tbaa 2420 2421.. option:: -fswift-async-fp=<option> 2422 2423Control emission of Swift async extended frame info (option: auto, always, never) 2424 2425.. option:: -fsymbol-partition=<arg> 2426 2427.. option:: -ftabstop=<arg> 2428 2429.. option:: -ftemplate-backtrace-limit=<arg> 2430 2431.. option:: -ftemplate-depth-<arg> 2432 2433.. option:: -ftemplate-depth=<arg> 2434 2435.. option:: -ftest-coverage, -fno-test-coverage 2436 2437.. option:: -fthin-link-bitcode=<arg> 2438 2439Write minimized bitcode to <file> for the ThinLTO thin link only 2440 2441.. option:: -fthinlto-index=<arg> 2442 2443Perform ThinLTO importing using provided function summary index 2444 2445.. option:: -fthreadsafe-statics, -fno-threadsafe-statics 2446 2447.. option:: -ftime-report 2448 2449.. program:: clang1 2450.. option:: -ftime-report=<arg> 2451.. program:: clang 2452 2453(For new pass manager) "per-pass": one report for each pass; "per-pass-run": one report for each pass invocation 2454 2455.. option:: -ftime-trace 2456 2457 2458Turn on time profiler. Generates JSON file based on output filename. Results 2459can be analyzed with chrome://tracing or `Speedscope App 2460<https://www.speedscope.app>`_ for flamegraph visualization. 2461 2462.. option:: -ftime-trace-granularity=<arg> 2463 2464Minimum time granularity (in microseconds) traced by time profiler 2465 2466.. option:: -ftls-model=<arg> 2467 2468.. option:: -ftrap-function=<arg> 2469 2470Issue call to specified function rather than a trap instruction 2471 2472.. option:: -ftrapping-math, -fno-trapping-math 2473 2474.. option:: -ftrapv 2475 2476Trap on integer overflow 2477 2478.. option:: -ftrapv-handler <arg> 2479 2480.. program:: clang1 2481.. option:: -ftrapv-handler=<function name> 2482.. program:: clang 2483 2484Specify the function to be called on overflow 2485 2486.. option:: -ftrigraphs, -fno-trigraphs, -trigraphs, --trigraphs 2487 2488Process trigraph sequences 2489 2490.. option:: -ftrivial-auto-var-init-stop-after=<arg> 2491 2492Stop initializing trivial automatic stack variables after the specified number of instances 2493 2494.. option:: -ftrivial-auto-var-init=<arg> 2495 2496Initialize trivial automatic stack variables: uninitialized (default) \| pattern 2497 2498.. option:: -funique-basic-block-section-names, -fno-unique-basic-block-section-names 2499 2500Use unique names for basic block sections (ELF Only) 2501 2502.. option:: -funique-internal-linkage-names, -fno-unique-internal-linkage-names 2503 2504Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path 2505 2506.. option:: -funique-section-names, -fno-unique-section-names 2507 2508.. option:: -funit-at-a-time, -fno-unit-at-a-time 2509 2510.. option:: -funroll-loops, -fno-unroll-loops 2511 2512Turn on loop unroller 2513 2514.. option:: -funsafe-math-optimizations, -fno-unsafe-math-optimizations 2515 2516.. option:: -funsigned-bitfields 2517 2518.. option:: -funsigned-char, -fno-unsigned-char, --unsigned-char 2519 2520.. option:: -funwind-tables, -fno-unwind-tables 2521 2522.. option:: -fuse-cxa-atexit, -fno-use-cxa-atexit 2523 2524.. option:: -fuse-init-array, -fno-use-init-array 2525 2526.. option:: -fuse-ld=<arg> 2527 2528.. option:: -fuse-line-directives, -fno-use-line-directives 2529 2530Use #line in preprocessed output 2531 2532.. option:: -fvalidate-ast-input-files-content 2533 2534Compute 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 2535 2536.. option:: -fveclib=<arg> 2537 2538Use the given vector functions library 2539 2540.. option:: -fvectorize, -fno-vectorize, -ftree-vectorize 2541 2542Enable the loop vectorization passes 2543 2544.. option:: -fverbose-asm, -dA, -fno-verbose-asm 2545 2546Generate verbose assembly output 2547 2548.. option:: -fvirtual-function-elimination, -fno-virtual-function-elimination 2549 2550Enables dead virtual function elimination optimization. Requires -flto=full 2551 2552.. option:: -fvisibility-dllexport=<arg> 2553 2554The visibility for dllexport definitions \[-fvisibility-from-dllstorageclass\] 2555 2556.. option:: -fvisibility-externs-dllimport=<arg> 2557 2558The visibility for dllimport external declarations \[-fvisibility-from-dllstorageclass\] 2559 2560.. option:: -fvisibility-externs-nodllstorageclass=<arg> 2561 2562The visibility for external declarations without an explicit DLL dllstorageclass \[-fvisibility-from-dllstorageclass\] 2563 2564.. option:: -fvisibility-from-dllstorageclass, -fno-visibility-from-dllstorageclass 2565 2566Set the visibility of symbols in the generated code from their DLL storage class 2567 2568.. option:: -fvisibility-global-new-delete-hidden 2569 2570Give global C++ operator new and delete declarations hidden visibility 2571 2572.. option:: -fvisibility-inlines-hidden, -fno-visibility-inlines-hidden 2573 2574Give inline C++ member functions hidden visibility by default 2575 2576.. option:: -fvisibility-inlines-hidden-static-local-var, -fno-visibility-inlines-hidden-static-local-var 2577 2578When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default 2579 2580.. option:: -fvisibility-ms-compat 2581 2582Give global types 'default' visibility and global functions and variables 'hidden' visibility by default 2583 2584.. option:: -fvisibility-nodllstorageclass=<arg> 2585 2586The visibility for defintiions without an explicit DLL export class \[-fvisibility-from-dllstorageclass\] 2587 2588.. option:: -fvisibility=<arg> 2589 2590Set the default symbol visibility for all global declarations 2591 2592.. option:: -fwasm-exceptions 2593 2594Use WebAssembly style exceptions 2595 2596.. option:: -fwhole-program-vtables, -fno-whole-program-vtables 2597 2598Enables whole-program vtable optimization. Requires -flto 2599 2600.. option:: -fwrapv, -fno-wrapv 2601 2602Treat signed integer overflow as two's complement 2603 2604.. option:: -fwritable-strings 2605 2606Store string literals as writable data 2607 2608.. option:: -fxl-pragma-pack, -fno-xl-pragma-pack 2609 2610Enable IBM XL #pragma pack handling 2611 2612.. option:: -fxray-always-emit-customevents, -fno-xray-always-emit-customevents 2613 2614Always emit \_\_xray\_customevent(...) calls even if the containing function is not always instrumented 2615 2616.. option:: -fxray-always-emit-typedevents, -fno-xray-always-emit-typedevents 2617 2618Always emit \_\_xray\_typedevent(...) calls even if the containing function is not always instrumented 2619 2620.. option:: -fxray-always-instrument=<arg> 2621 2622DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. 2623 2624.. option:: -fxray-attr-list=<arg> 2625 2626Filename defining the list of functions/types for imbuing XRay attributes. 2627 2628.. option:: -fxray-function-groups=<arg> 2629 2630Only instrument 1 of N groups 2631 2632.. option:: -fxray-function-index, -fno-xray-function-index 2633 2634.. option:: -fxray-ignore-loops, -fno-xray-ignore-loops 2635 2636Don't instrument functions with loops unless they also meet the minimum function size 2637 2638.. option:: -fxray-instruction-threshold<arg> 2639 2640.. program:: clang1 2641.. option:: -fxray-instruction-threshold=<arg> 2642.. program:: clang 2643 2644Sets the minimum function size to instrument with XRay 2645 2646.. option:: -fxray-instrument, -fno-xray-instrument 2647 2648Generate XRay instrumentation sleds on function entry and exit 2649 2650.. option:: -fxray-instrumentation-bundle=<arg> 2651 2652Select 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'. 2653 2654.. option:: -fxray-link-deps 2655 2656Tells clang to add the link dependencies for XRay. 2657 2658.. option:: -fxray-modes=<arg> 2659 2660List of modes to link in by default into XRay instrumented binaries. 2661 2662.. option:: -fxray-never-instrument=<arg> 2663 2664DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. 2665 2666.. option:: -fxray-selected-function-group=<arg> 2667 2668When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1 2669 2670.. option:: -fzero-initialized-in-bss, -fno-zero-initialized-in-bss 2671 2672.. option:: -fzvector, -fno-zvector, -mzvector 2673 2674Enable System z vector language extension 2675 2676.. option:: --gpu-bundle-output, --no-gpu-bundle-output 2677 2678Bundle output files of HIP device compilation 2679 2680.. option:: -pedantic, --pedantic, -no-pedantic, --no-pedantic 2681 2682Warn on language extensions 2683 2684.. option:: -pedantic-errors, --pedantic-errors 2685 2686OpenCL flags 2687------------ 2688.. option:: -cl-denorms-are-zero 2689 2690OpenCL only. Allow denormals to be flushed to zero. 2691 2692.. option:: -cl-fast-relaxed-math 2693 2694OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines \_\_FAST\_RELAXED\_MATH\_\_. 2695 2696.. option:: -cl-finite-math-only 2697 2698OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf. 2699 2700.. option:: -cl-fp32-correctly-rounded-divide-sqrt 2701 2702OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded. 2703 2704.. option:: -cl-kernel-arg-info 2705 2706OpenCL only. Generate kernel argument metadata. 2707 2708.. option:: -cl-mad-enable 2709 2710OpenCL only. Allow use of less precise MAD computations in the generated binary. 2711 2712.. option:: -cl-no-signed-zeros 2713 2714OpenCL only. Allow use of less precise no signed zeros computations in the generated binary. 2715 2716.. option:: -cl-no-stdinc 2717 2718OpenCL only. Disables all standard includes containing non-native compiler types and functions. 2719 2720.. option:: -cl-opt-disable 2721 2722OpenCL only. This option disables all optimizations. By default optimizations are enabled. 2723 2724.. option:: -cl-single-precision-constant 2725 2726OpenCL only. Treat double precision floating-point constant as single precision constant. 2727 2728.. option:: -cl-std=<arg> 2729 2730OpenCL language standard to compile for. 2731 2732.. option:: -cl-strict-aliasing 2733 2734OpenCL only. This option is added for compatibility with OpenCL 1.0. 2735 2736.. option:: -cl-uniform-work-group-size 2737 2738OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel 2739 2740.. option:: -cl-unsafe-math-optimizations 2741 2742OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable. 2743 2744SYCL flags 2745---------- 2746.. option:: -fsycl, -fno-sycl 2747 2748Enables SYCL kernels compilation for device 2749 2750.. option:: -sycl-std=<arg> 2751 2752SYCL language standard to compile for. 2753 2754Target-dependent compilation options 2755~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2756.. option:: -G<size>, -G=<arg>, -msmall-data-limit=<arg>, -msmall-data-threshold=<arg> 2757 2758Put objects of at most <size> bytes into small data section (MIPS / Hexagon) 2759 2760.. option:: -ffixed-x1 2761 2762Reserve the x1 register (AArch64/RISC-V only) 2763 2764.. option:: -ffixed-x10 2765 2766Reserve the x10 register (AArch64/RISC-V only) 2767 2768.. option:: -ffixed-x11 2769 2770Reserve the x11 register (AArch64/RISC-V only) 2771 2772.. option:: -ffixed-x12 2773 2774Reserve the x12 register (AArch64/RISC-V only) 2775 2776.. option:: -ffixed-x13 2777 2778Reserve the x13 register (AArch64/RISC-V only) 2779 2780.. option:: -ffixed-x14 2781 2782Reserve the x14 register (AArch64/RISC-V only) 2783 2784.. option:: -ffixed-x15 2785 2786Reserve the x15 register (AArch64/RISC-V only) 2787 2788.. option:: -ffixed-x16 2789 2790Reserve the x16 register (AArch64/RISC-V only) 2791 2792.. option:: -ffixed-x17 2793 2794Reserve the x17 register (AArch64/RISC-V only) 2795 2796.. option:: -ffixed-x18 2797 2798Reserve the x18 register (AArch64/RISC-V only) 2799 2800.. option:: -ffixed-x19 2801 2802Reserve the x19 register (AArch64/RISC-V only) 2803 2804.. option:: -ffixed-x2 2805 2806Reserve the x2 register (AArch64/RISC-V only) 2807 2808.. option:: -ffixed-x20 2809 2810Reserve the x20 register (AArch64/RISC-V only) 2811 2812.. option:: -ffixed-x21 2813 2814Reserve the x21 register (AArch64/RISC-V only) 2815 2816.. option:: -ffixed-x22 2817 2818Reserve the x22 register (AArch64/RISC-V only) 2819 2820.. option:: -ffixed-x23 2821 2822Reserve the x23 register (AArch64/RISC-V only) 2823 2824.. option:: -ffixed-x24 2825 2826Reserve the x24 register (AArch64/RISC-V only) 2827 2828.. option:: -ffixed-x25 2829 2830Reserve the x25 register (AArch64/RISC-V only) 2831 2832.. option:: -ffixed-x26 2833 2834Reserve the x26 register (AArch64/RISC-V only) 2835 2836.. option:: -ffixed-x27 2837 2838Reserve the x27 register (AArch64/RISC-V only) 2839 2840.. option:: -ffixed-x28 2841 2842Reserve the x28 register (AArch64/RISC-V only) 2843 2844.. option:: -ffixed-x29 2845 2846Reserve the x29 register (AArch64/RISC-V only) 2847 2848.. option:: -ffixed-x3 2849 2850Reserve the x3 register (AArch64/RISC-V only) 2851 2852.. option:: -ffixed-x30 2853 2854Reserve the x30 register (AArch64/RISC-V only) 2855 2856.. option:: -ffixed-x31 2857 2858Reserve the x31 register (AArch64/RISC-V only) 2859 2860.. option:: -ffixed-x4 2861 2862Reserve the x4 register (AArch64/RISC-V only) 2863 2864.. option:: -ffixed-x5 2865 2866Reserve the x5 register (AArch64/RISC-V only) 2867 2868.. option:: -ffixed-x6 2869 2870Reserve the x6 register (AArch64/RISC-V only) 2871 2872.. option:: -ffixed-x7 2873 2874Reserve the x7 register (AArch64/RISC-V only) 2875 2876.. option:: -ffixed-x8 2877 2878Reserve the x8 register (AArch64/RISC-V only) 2879 2880.. option:: -ffixed-x9 2881 2882Reserve the x9 register (AArch64/RISC-V only) 2883 2884.. option:: -ffuchsia-api-level=<arg> 2885 2886Set Fuchsia API level 2887 2888.. option:: -inline-asm=<arg> 2889 2890.. option:: -m16 2891 2892.. option:: -m32 2893 2894.. option:: -m64 2895 2896.. option:: -mabi=<arg> 2897 2898.. program:: clang1 2899.. option:: -mabi=vec-default 2900.. program:: clang 2901 2902Enable the default Altivec ABI on AIX (AIX only). Uses only volatile vector registers. 2903 2904.. program:: clang2 2905.. option:: -mabi=vec-extabi 2906.. program:: clang 2907 2908Enable the extended Altivec ABI on AIX (AIX only). Uses volatile and nonvolatile vector registers 2909 2910.. option:: -maix-struct-return 2911 2912Return all structs in memory (PPC32 only) 2913 2914.. option:: -malign-branch-boundary=<arg> 2915 2916Specify the boundary's size to align branches 2917 2918.. option:: -malign-branch=<arg1>,<arg2>... 2919 2920Specify types of branches to align 2921 2922.. option:: -malign-double 2923 2924Align doubles to two words in structs (x86 only) 2925 2926.. option:: -mamdgpu-ieee, -mno-amdgpu-ieee 2927 2928Sets the IEEE bit in the expected default floating point mode register. Floating point opcodes that support exception flag gathering quiet and propagate signaling NaN inputs per IEEE 754-2008. This option changes the ABI. (AMDGPU only) 2929 2930.. option:: -march=<arg> 2931 2932.. option:: -masm=<arg> 2933 2934.. option:: -mbackchain, -mno-backchain 2935 2936Link stack frames through backchain on System Z 2937 2938.. option:: -mbranches-within-32B-boundaries 2939 2940Align selected branches (fused, jcc, jmp) within 32-byte boundary 2941 2942.. option:: -mcmodel=<arg>, -mcmodel=medany (equivalent to -mcmodel=medium), -mcmodel=medlow (equivalent to -mcmodel=small) 2943 2944.. option:: -mcode-object-v3, -mno-code-object-v3 2945 2946Legacy option to specify code object ABI V3 (AMDGPU only) 2947 2948.. option:: -mcode-object-version=<version> 2949 2950Specify code object ABI version. Defaults to 3. (AMDGPU only) 2951 2952.. option:: -mconsole<arg> 2953 2954.. program:: clang1 2955.. 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), -mv68 (equivalent to -mcpu=hexagonv68), -mv69 (equivalent to -mcpu=hexagonv69) 2956.. program:: clang 2957 2958.. option:: -mcrc, -mno-crc 2959 2960Allow use of CRC instructions (ARM/Mips only) 2961 2962.. option:: -mdefault-build-attributes<arg>, -mno-default-build-attributes<arg> 2963 2964.. option:: -mdll<arg> 2965 2966.. option:: -mdouble=<arg> 2967 2968Force double to be 32 bits or 64 bits 2969 2970.. option:: -mdynamic-no-pic<arg> 2971 2972.. option:: -meabi <arg> 2973 2974Set EABI type, e.g. 4, 5 or gnu (default depends on triple) 2975 2976.. option:: -menable-experimental-extensions 2977 2978Enable use of experimental RISC-V extensions. 2979 2980.. option:: -mfentry 2981 2982Insert calls to fentry at function entry (x86/SystemZ only) 2983 2984.. option:: -mfloat-abi=<arg> 2985 2986.. option:: -mfpmath=<arg> 2987 2988.. option:: -mfpu=<arg> 2989 2990.. option:: -mgeneral-regs-only 2991 2992Generate code which only uses the general purpose registers (AArch64/x86 only) 2993 2994.. option:: -mglobal-merge, -mno-global-merge 2995 2996Enable merging of globals 2997 2998.. option:: -mhard-float 2999 3000.. option:: -mhwdiv=<arg>, --mhwdiv <arg>, --mhwdiv=<arg> 3001 3002.. option:: -mhwmult=<arg> 3003 3004.. option:: -miamcu, -mno-iamcu 3005 3006Use Intel MCU ABI 3007 3008.. option:: -mignore-xcoff-visibility 3009 3010Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file 3011 3012.. option:: -mimplicit-float, -mno-implicit-float 3013 3014.. option:: -mimplicit-it=<arg> 3015 3016.. option:: -mincremental-linker-compatible, -mno-incremental-linker-compatible 3017 3018(integrated-as) Emit an object file which can be used with an incremental linker 3019 3020.. option:: -miphoneos-version-min=<arg>, -mios-version-min=<arg> 3021 3022.. option:: -mkernel 3023 3024.. option:: -mlong-calls, -mno-long-calls 3025 3026Generate branches with extended addressability, usually via indirect jumps. 3027 3028.. option:: -mlvi-cfi, -mno-lvi-cfi 3029 3030Enable only control-flow mitigations for Load Value Injection (LVI) 3031 3032.. option:: -mlvi-hardening, -mno-lvi-hardening 3033 3034Enable all mitigations for Load Value Injection (LVI) 3035 3036.. option:: -mmacosx-version-min=<arg>, -mmacos-version-min=<arg> 3037 3038Set Mac OS X deployment target 3039 3040.. option:: -mmcu=<arg> 3041 3042.. option:: -mms-bitfields, -mno-ms-bitfields 3043 3044Set the default structure layout to be compatible with the Microsoft compiler standard 3045 3046.. option:: -mnop-mcount 3047 3048Generate mcount/\_\_fentry\_\_ calls as nops. To activate they need to be patched in. 3049 3050.. option:: -momit-leaf-frame-pointer, -mno-omit-leaf-frame-pointer 3051 3052Omit frame pointer setup for leaf functions 3053 3054.. option:: -moslib=<arg> 3055 3056.. option:: -mpacked-stack, -mno-packed-stack 3057 3058Use packed stack layout (SystemZ only). 3059 3060.. option:: -mpad-max-prefix-size=<arg> 3061 3062Specify maximum number of prefixes to use for padding 3063 3064.. option:: -mprefer-vector-width=<arg> 3065 3066Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. 3067 3068.. option:: -mqdsp6-compat 3069 3070Enable hexagon-qdsp6 backward compatibility 3071 3072.. option:: -mrecip 3073 3074.. program:: clang1 3075.. option:: -mrecip=<arg1>,<arg2>... 3076.. program:: clang 3077 3078.. option:: -mrecord-mcount 3079 3080Generate a \_\_mcount\_loc section entry for each \_\_fentry\_\_ call. 3081 3082.. option:: -mred-zone, -mno-red-zone 3083 3084.. option:: -mregparm=<arg> 3085 3086.. option:: -mrelax, -mno-relax 3087 3088Enable linker relaxation 3089 3090.. option:: -mrelax-all, -mno-relax-all 3091 3092(integrated-as) Relax all machine instructions 3093 3094.. option:: -mretpoline, -mno-retpoline 3095 3096.. option:: -mrtd, -mno-rtd 3097 3098Make StdCall calling convention the default 3099 3100.. option:: -mseses, -mno-seses 3101 3102Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations 3103 3104.. option:: -msign-return-address=<arg> 3105 3106Select return address signing scope 3107 3108.. option:: -msim 3109 3110.. option:: -mskip-rax-setup, -mno-skip-rax-setup 3111 3112Skip setting up RAX register when passing variable arguments (x86 only) 3113 3114.. option:: -msoft-float, -mno-soft-float 3115 3116Use software floating point 3117 3118.. option:: -mspeculative-load-hardening, -mno-speculative-load-hardening 3119 3120.. option:: -mstack-alignment=<arg> 3121 3122Set the stack alignment 3123 3124.. option:: -mstack-arg-probe, -mno-stack-arg-probe 3125 3126Enable stack probes 3127 3128.. option:: -mstack-probe-size=<arg> 3129 3130Set the stack probe size 3131 3132.. option:: -mstack-protector-guard-offset=<arg> 3133 3134Use the given offset for addressing the stack-protector guard 3135 3136.. option:: -mstack-protector-guard-reg=<arg> 3137 3138Use the given reg for addressing the stack-protector guard 3139 3140.. option:: -mstack-protector-guard=<arg> 3141 3142Use the given guard (global, tls) for addressing the stack-protector guard 3143 3144.. option:: -mstackrealign, -mno-stackrealign 3145 3146Force realign the stack at entry to every function 3147 3148.. option:: -msvr4-struct-return 3149 3150Return small structs in registers (PPC32 only) 3151 3152.. option:: -mtargetos=<arg> 3153 3154Set the deployment target to be the specified OS and OS version 3155 3156.. option:: -mthread-model <arg> 3157 3158The thread model to use, e.g. posix, single (posix by default) 3159 3160.. option:: -mthreads<arg> 3161 3162.. option:: -mthumb, -mno-thumb 3163 3164.. option:: -mtls-direct-seg-refs, -mno-tls-direct-seg-refs 3165 3166Enable direct TLS access through segment registers (default) 3167 3168.. option:: -mtls-size=<arg> 3169 3170Specify 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) 3171 3172.. program:: clang1 3173.. option:: -mtune=<arg> 3174.. program:: clang 3175 3176Only supported on X86 and RISC-V. Otherwise accepted for compatibility with GCC. 3177 3178.. option:: -mtvos-version-min=<arg>, -mappletvos-version-min=<arg> 3179 3180.. option:: -municode<arg> 3181 3182.. option:: -munsafe-fp-atomics, -mno-unsafe-fp-atomics 3183 3184Enable unsafe floating point atomic instructions (AMDGPU only) 3185 3186.. option:: -mvx, -mno-vx 3187 3188.. option:: -mwarn-nonportable-cfstrings, -mno-warn-nonportable-cfstrings 3189 3190.. option:: -mwatchos-version-min=<arg> 3191 3192.. option:: -mwavefrontsize64, -mno-wavefrontsize64 3193 3194Specify wavefront size 64 mode (AMDGPU only) 3195 3196.. option:: -mwindows<arg> 3197 3198.. option:: -mx32 3199 3200AARCH64 3201------- 3202.. option:: -fcall-saved-x10 3203 3204Make the x10 register call-saved (AArch64 only) 3205 3206.. option:: -fcall-saved-x11 3207 3208Make the x11 register call-saved (AArch64 only) 3209 3210.. option:: -fcall-saved-x12 3211 3212Make the x12 register call-saved (AArch64 only) 3213 3214.. option:: -fcall-saved-x13 3215 3216Make the x13 register call-saved (AArch64 only) 3217 3218.. option:: -fcall-saved-x14 3219 3220Make the x14 register call-saved (AArch64 only) 3221 3222.. option:: -fcall-saved-x15 3223 3224Make the x15 register call-saved (AArch64 only) 3225 3226.. option:: -fcall-saved-x18 3227 3228Make the x18 register call-saved (AArch64 only) 3229 3230.. option:: -fcall-saved-x8 3231 3232Make the x8 register call-saved (AArch64 only) 3233 3234.. option:: -fcall-saved-x9 3235 3236Make the x9 register call-saved (AArch64 only) 3237 3238.. option:: -mfix-cortex-a53-835769, -mno-fix-cortex-a53-835769 3239 3240Workaround Cortex-A53 erratum 835769 (AArch64 only) 3241 3242.. option:: -mmark-bti-property 3243 3244Add .note.gnu.property with BTI to assembly files (AArch64 only) 3245 3246.. option:: -msve-vector-bits=<arg> 3247 3248Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only) 3249 3250.. option:: -mvscale-max=<arg> 3251 3252Specify the vscale maximum. Defaults to the vector length agnostic value of "0". (AArch64 only) 3253 3254.. option:: -mvscale-min=<arg> 3255 3256Specify the vscale minimum. Defaults to "1". (AArch64 only) 3257 3258AMDGPU 3259------ 3260.. option:: -mcumode, -mno-cumode 3261 3262Specify CU wavefront execution mode (AMDGPU only) 3263 3264.. option:: -mtgsplit, -mno-tgsplit 3265 3266Enable threadgroup split execution mode (AMDGPU only) 3267 3268ARM 3269--- 3270.. option:: -faapcs-bitfield-load 3271 3272Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only). 3273 3274.. option:: -faapcs-bitfield-width, -fno-aapcs-bitfield-width 3275 3276Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only). 3277 3278.. option:: -ffixed-r9 3279 3280Reserve the r9 register (ARM only) 3281 3282.. option:: -mcmse 3283 3284Allow use of CMSE (Armv8-M Security Extensions) 3285 3286.. option:: -mexecute-only, -mno-execute-only, -mpure-code 3287 3288Disallow generation of data access to code sections (ARM only) 3289 3290.. option:: -mfix-cmse-cve-2021-35465, -mno-fix-cmse-cve-2021-35465 3291 3292Work around VLLDM erratum CVE-2021-35465 (ARM only) 3293 3294.. option:: -mno-bti-at-return-twice 3295 3296Do not add a BTI instruction after a setjmp or other return-twice construct (Arm only) 3297 3298.. option:: -mno-movt 3299 3300Disallow use of movt/movw pairs (ARM only) 3301 3302.. option:: -mno-neg-immediates 3303 3304Disallow converting instructions with negative immediates to their negation or inversion. 3305 3306.. option:: -mnocrc 3307 3308Disallow use of CRC instructions (ARM only) 3309 3310.. option:: -mrestrict-it, -mno-restrict-it 3311 3312Disallow generation of deprecated IT blocks for ARMv8. It is on by default for ARMv8 Thumb mode. 3313 3314.. option:: -mtp=<arg> 3315 3316Thread pointer access method (AArch32/AArch64 only) 3317 3318.. option:: -munaligned-access, -mno-unaligned-access 3319 3320Allow memory accesses to be unaligned (AArch32/AArch64 only) 3321 3322Hexagon 3323------- 3324.. option:: -mhvx-ieee-fp, -mno-hvx-ieee-fp 3325 3326Enable Hexagon HVX IEEE floating-point 3327 3328.. option:: -mieee-rnd-near 3329 3330.. option:: -mmemops, -mno-memops 3331 3332Enable generation of memop instructions 3333 3334.. option:: -mnvj, -mno-nvj 3335 3336Enable generation of new-value jumps 3337 3338.. option:: -mnvs, -mno-nvs 3339 3340Enable generation of new-value stores 3341 3342.. option:: -mpackets, -mno-packets 3343 3344Enable generation of instruction packets 3345 3346Hexagon 3347------- 3348.. option:: -mhvx, -mno-hvx 3349 3350Enable Hexagon Vector eXtensions 3351 3352.. option:: -mhvx-length=<arg> 3353 3354Set Hexagon Vector Length 3355 3356.. option:: -mhvx-qfloat, -mno-hvx-qfloat 3357 3358Enable Hexagon HVX QFloat instructions 3359 3360.. program:: clang1 3361.. option:: -mhvx=<arg> 3362.. program:: clang 3363 3364Enable Hexagon Vector eXtensions 3365 3366M68k 3367---- 3368.. option:: -ffixed-a0 3369 3370Reserve the a0 register (M68k only) 3371 3372.. option:: -ffixed-a1 3373 3374Reserve the a1 register (M68k only) 3375 3376.. option:: -ffixed-a2 3377 3378Reserve the a2 register (M68k only) 3379 3380.. option:: -ffixed-a3 3381 3382Reserve the a3 register (M68k only) 3383 3384.. option:: -ffixed-a4 3385 3386Reserve the a4 register (M68k only) 3387 3388.. option:: -ffixed-a5 3389 3390Reserve the a5 register (M68k only) 3391 3392.. option:: -ffixed-a6 3393 3394Reserve the a6 register (M68k only) 3395 3396.. option:: -ffixed-d0 3397 3398Reserve the d0 register (M68k only) 3399 3400.. option:: -ffixed-d1 3401 3402Reserve the d1 register (M68k only) 3403 3404.. option:: -ffixed-d2 3405 3406Reserve the d2 register (M68k only) 3407 3408.. option:: -ffixed-d3 3409 3410Reserve the d3 register (M68k only) 3411 3412.. option:: -ffixed-d4 3413 3414Reserve the d4 register (M68k only) 3415 3416.. option:: -ffixed-d5 3417 3418Reserve the d5 register (M68k only) 3419 3420.. option:: -ffixed-d6 3421 3422Reserve the d6 register (M68k only) 3423 3424.. option:: -ffixed-d7 3425 3426Reserve the d7 register (M68k only) 3427 3428.. option:: -m68000 3429 3430.. option:: -m68010 3431 3432.. option:: -m68020 3433 3434.. option:: -m68030 3435 3436.. option:: -m68040 3437 3438.. option:: -m68060 3439 3440MIPS 3441---- 3442.. option:: -mabicalls, -mno-abicalls 3443 3444Enable SVR4-style position-independent code (Mips only) 3445 3446.. option:: -mabs=<arg> 3447 3448.. option:: -mcheck-zero-division, -mno-check-zero-division 3449 3450.. option:: -mcompact-branches=<arg> 3451 3452.. option:: -mdouble-float 3453 3454.. option:: -mdsp, -mno-dsp 3455 3456.. option:: -mdspr2, -mno-dspr2 3457 3458.. option:: -membedded-data, -mno-embedded-data 3459 3460Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS) 3461 3462.. option:: -mextern-sdata, -mno-extern-sdata 3463 3464Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS) 3465 3466.. option:: -mfix4300 3467 3468.. option:: -mfp32 3469 3470Use 32-bit floating point registers (MIPS only) 3471 3472.. option:: -mfp64 3473 3474Use 64-bit floating point registers (MIPS only) 3475 3476.. option:: -mginv, -mno-ginv 3477 3478.. option:: -mgpopt, -mno-gpopt 3479 3480Use GP relative accesses for symbols known to be in a small data section (MIPS) 3481 3482.. option:: -mindirect-jump=<arg> 3483 3484Change indirect jump instructions to inhibit speculation 3485 3486.. option:: -mips16 3487 3488.. option:: -mldc1-sdc1, -mno-ldc1-sdc1 3489 3490.. option:: -mlocal-sdata, -mno-local-sdata 3491 3492Extend the -G behaviour to object local data (MIPS) 3493 3494.. option:: -mmadd4, -mno-madd4 3495 3496Enable the generation of 4-operand madd.s, madd.d and related instructions. 3497 3498.. option:: -mmicromips, -mno-micromips 3499 3500.. option:: -mmsa, -mno-msa 3501 3502Enable MSA ASE (MIPS only) 3503 3504.. option:: -mmt, -mno-mt 3505 3506Enable MT ASE (MIPS only) 3507 3508.. option:: -mnan=<arg> 3509 3510.. option:: -mno-mips16 3511 3512.. option:: -msingle-float 3513 3514.. option:: -mvirt, -mno-virt 3515 3516.. option:: -mxgot, -mno-xgot 3517 3518PowerPC 3519------- 3520.. option:: -maltivec, -mno-altivec 3521 3522.. option:: -mcmpb, -mno-cmpb 3523 3524.. option:: -mcrbits, -mno-crbits 3525 3526.. option:: -mcrypto, -mno-crypto 3527 3528.. option:: -mdirect-move, -mno-direct-move 3529 3530.. option:: -mefpu2 3531 3532.. option:: -mfloat128, -mno-float128 3533 3534.. option:: -mfprnd, -mno-fprnd 3535 3536.. option:: -mhtm, -mno-htm 3537 3538.. option:: -minvariant-function-descriptors, -mno-invariant-function-descriptors 3539 3540.. option:: -misel, -mno-isel 3541 3542.. option:: -mlongcall, -mno-longcall 3543 3544.. option:: -mmfocrf, -mmfcrf, -mno-mfocrf 3545 3546.. option:: -mmma, -mno-mma 3547 3548.. option:: -mpaired-vector-memops, -mno-paired-vector-memops 3549 3550.. option:: -mpcrel, -mno-pcrel 3551 3552.. option:: -mpopcntd, -mno-popcntd 3553 3554.. option:: -mpower10-vector, -mno-power10-vector 3555 3556.. option:: -mpower8-vector, -mno-power8-vector 3557 3558.. option:: -mpower9-vector, -mno-power9-vector 3559 3560.. option:: -mprefixed, -mno-prefixed 3561 3562.. option:: -mprivileged 3563 3564.. option:: -mrop-protect 3565 3566.. option:: -msecure-plt 3567 3568.. option:: -mspe, -mno-spe 3569 3570.. option:: -mvsx, -mno-vsx 3571 3572WebAssembly 3573----------- 3574.. option:: -matomics, -mno-atomics 3575 3576.. option:: -mbulk-memory, -mno-bulk-memory 3577 3578.. option:: -mexception-handling, -mno-exception-handling 3579 3580.. option:: -mmultivalue, -mno-multivalue 3581 3582.. option:: -mmutable-globals, -mno-mutable-globals 3583 3584.. option:: -mnontrapping-fptoint, -mno-nontrapping-fptoint 3585 3586.. option:: -mreference-types, -mno-reference-types 3587 3588.. option:: -mrelaxed-simd, -mno-relaxed-simd 3589 3590.. option:: -msign-ext, -mno-sign-ext 3591 3592.. option:: -msimd128, -mno-simd128 3593 3594.. option:: -mtail-call, -mno-tail-call 3595 3596WebAssembly Driver 3597------------------ 3598.. option:: -mexec-model=<arg> 3599 3600Execution model (WebAssembly only) 3601 3602X86 3603--- 3604.. option:: -m3dnow, -mno-3dnow 3605 3606.. option:: -m3dnowa, -mno-3dnowa 3607 3608.. option:: -madx, -mno-adx 3609 3610.. option:: -maes, -mno-aes 3611 3612.. option:: -mamx-bf16, -mno-amx-bf16 3613 3614.. option:: -mamx-int8, -mno-amx-int8 3615 3616.. option:: -mamx-tile, -mno-amx-tile 3617 3618.. option:: -mavx, -mno-avx 3619 3620.. option:: -mavx2, -mno-avx2 3621 3622.. option:: -mavx512bf16, -mno-avx512bf16 3623 3624.. option:: -mavx512bitalg, -mno-avx512bitalg 3625 3626.. option:: -mavx512bw, -mno-avx512bw 3627 3628.. option:: -mavx512cd, -mno-avx512cd 3629 3630.. option:: -mavx512dq, -mno-avx512dq 3631 3632.. option:: -mavx512er, -mno-avx512er 3633 3634.. option:: -mavx512f, -mno-avx512f 3635 3636.. option:: -mavx512fp16, -mno-avx512fp16 3637 3638.. option:: -mavx512ifma, -mno-avx512ifma 3639 3640.. option:: -mavx512pf, -mno-avx512pf 3641 3642.. option:: -mavx512vbmi, -mno-avx512vbmi 3643 3644.. option:: -mavx512vbmi2, -mno-avx512vbmi2 3645 3646.. option:: -mavx512vl, -mno-avx512vl 3647 3648.. option:: -mavx512vnni, -mno-avx512vnni 3649 3650.. option:: -mavx512vp2intersect, -mno-avx512vp2intersect 3651 3652.. option:: -mavx512vpopcntdq, -mno-avx512vpopcntdq 3653 3654.. option:: -mavxvnni, -mno-avxvnni 3655 3656.. option:: -mbmi, -mno-bmi 3657 3658.. option:: -mbmi2, -mno-bmi2 3659 3660.. option:: -mcldemote, -mno-cldemote 3661 3662.. option:: -mclflushopt, -mno-clflushopt 3663 3664.. option:: -mclwb, -mno-clwb 3665 3666.. option:: -mclzero, -mno-clzero 3667 3668.. option:: -mcrc32, -mno-crc32 3669 3670.. option:: -mcx16, -mno-cx16 3671 3672.. option:: -menqcmd, -mno-enqcmd 3673 3674.. option:: -mf16c, -mno-f16c 3675 3676.. option:: -mfma, -mno-fma 3677 3678.. option:: -mfma4, -mno-fma4 3679 3680.. option:: -mfsgsbase, -mno-fsgsbase 3681 3682.. option:: -mfxsr, -mno-fxsr 3683 3684.. option:: -mgfni, -mno-gfni 3685 3686.. option:: -mhreset, -mno-hreset 3687 3688.. option:: -minvpcid, -mno-invpcid 3689 3690.. option:: -mkl, -mno-kl 3691 3692.. option:: -mlwp, -mno-lwp 3693 3694.. option:: -mlzcnt, -mno-lzcnt 3695 3696.. option:: -mmmx, -mno-mmx 3697 3698.. option:: -mmovbe, -mno-movbe 3699 3700.. option:: -mmovdir64b, -mno-movdir64b 3701 3702.. option:: -mmovdiri, -mno-movdiri 3703 3704.. option:: -mmwaitx, -mno-mwaitx 3705 3706.. option:: -mpclmul, -mno-pclmul 3707 3708.. option:: -mpconfig, -mno-pconfig 3709 3710.. option:: -mpku, -mno-pku 3711 3712.. option:: -mpopcnt, -mno-popcnt 3713 3714.. option:: -mprefetchwt1, -mno-prefetchwt1 3715 3716.. option:: -mprfchw, -mno-prfchw 3717 3718.. option:: -mptwrite, -mno-ptwrite 3719 3720.. option:: -mrdpid, -mno-rdpid 3721 3722.. option:: -mrdrnd, -mno-rdrnd 3723 3724.. option:: -mrdseed, -mno-rdseed 3725 3726.. option:: -mretpoline-external-thunk, -mno-retpoline-external-thunk 3727 3728.. option:: -mrtm, -mno-rtm 3729 3730.. option:: -msahf, -mno-sahf 3731 3732.. option:: -mserialize, -mno-serialize 3733 3734.. option:: -msgx, -mno-sgx 3735 3736.. option:: -msha, -mno-sha 3737 3738.. option:: -mshstk, -mno-shstk 3739 3740.. option:: -msse, -mno-sse 3741 3742.. option:: -msse2, -mno-sse2 3743 3744.. option:: -msse3, -mno-sse3 3745 3746.. option:: -msse4.1, -mno-sse4.1 3747 3748.. program:: clang1 3749.. option:: -msse4.2, -mno-sse4.2, -msse4 3750.. program:: clang 3751 3752.. option:: -msse4a, -mno-sse4a 3753 3754.. option:: -mssse3, -mno-ssse3 3755 3756.. option:: -mtbm, -mno-tbm 3757 3758.. option:: -mtsxldtrk, -mno-tsxldtrk 3759 3760.. option:: -muintr, -mno-uintr 3761 3762.. option:: -mvaes, -mno-vaes 3763 3764.. option:: -mvpclmulqdq, -mno-vpclmulqdq 3765 3766.. option:: -mvzeroupper, -mno-vzeroupper 3767 3768.. option:: -mwaitpkg, -mno-waitpkg 3769 3770.. option:: -mwbnoinvd, -mno-wbnoinvd 3771 3772.. option:: -mwidekl, -mno-widekl 3773 3774.. option:: -mx87, -m80387, -mno-x87 3775 3776.. option:: -mxop, -mno-xop 3777 3778.. option:: -mxsave, -mno-xsave 3779 3780.. option:: -mxsavec, -mno-xsavec 3781 3782.. option:: -mxsaveopt, -mno-xsaveopt 3783 3784.. option:: -mxsaves, -mno-xsaves 3785 3786RISCV 3787----- 3788.. option:: -msave-restore, -mno-save-restore 3789 3790Enable using library calls for save and restore 3791 3792Long double flags 3793----------------- 3794Selects the long double implementation 3795 3796.. option:: -mlong-double-128 3797 3798Force long double to be 128 bits 3799 3800.. option:: -mlong-double-64 3801 3802Force long double to be 64 bits 3803 3804.. option:: -mlong-double-80 3805 3806Force long double to be 80 bits, padded to 128 bits for storage 3807 3808Optimization level 3809~~~~~~~~~~~~~~~~~~ 3810 3811Flags controlling how much optimization should be performed. 3812 3813.. option:: -O<arg>, -O (equivalent to -O1), --optimize, --optimize=<arg> 3814 3815.. option:: -Ofast<arg> 3816 3817Debug information generation 3818~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3819 3820Flags controlling how much and what kind of debug information should be 3821generated. 3822 3823Kind and level of debug information 3824----------------------------------- 3825.. option:: -g, --debug, --debug=<arg> 3826 3827Generate source-level debug information 3828 3829.. option:: -gdwarf 3830 3831Generate source-level debug information with the default dwarf version 3832 3833.. option:: -gdwarf-2 3834 3835Generate source-level debug information with dwarf version 2 3836 3837.. option:: -gdwarf-3 3838 3839Generate source-level debug information with dwarf version 3 3840 3841.. option:: -gdwarf-4 3842 3843Generate source-level debug information with dwarf version 4 3844 3845.. option:: -gdwarf-5 3846 3847Generate source-level debug information with dwarf version 5 3848 3849.. option:: -gdwarf32 3850 3851Enables DWARF32 format for ELF binaries, if debug information emission is enabled. 3852 3853.. option:: -gdwarf64 3854 3855Enables DWARF64 format for ELF binaries, if debug information emission is enabled. 3856 3857.. option:: -gfull 3858 3859.. option:: -ginline-line-tables, -gno-inline-line-tables 3860 3861.. option:: -gused 3862 3863Debug level 3864___________ 3865.. option:: -g0 3866 3867.. option:: -g2 3868 3869.. option:: -g3 3870 3871.. option:: -ggdb0 3872 3873.. option:: -ggdb1 3874 3875.. option:: -ggdb2 3876 3877.. option:: -ggdb3 3878 3879.. option:: -gline-directives-only 3880 3881Emit debug line info directives only 3882 3883.. option:: -gline-tables-only, -g1, -gmlt 3884 3885Emit debug line number tables only 3886 3887.. option:: -gmodules 3888 3889Generate debug info with external references to clang modules or precompiled headers 3890 3891Debugger to tune debug information for 3892______________________________________ 3893.. option:: -gdbx 3894 3895.. option:: -ggdb 3896 3897.. option:: -glldb 3898 3899.. option:: -gsce 3900 3901Debug information flags 3902----------------------- 3903.. option:: -gcolumn-info, -gno-column-info 3904 3905.. option:: -gdwarf-aranges 3906 3907.. option:: -gembed-source, -gno-embed-source 3908 3909Embed source text in DWARF debug sections 3910 3911.. option:: -ggnu-pubnames, -gno-gnu-pubnames 3912 3913.. option:: -gpubnames, -gno-pubnames 3914 3915.. option:: -grecord-command-line, -gno-record-command-line, -grecord-gcc-switches 3916 3917.. option:: -gsimple-template-names, -gno-simple-template-names 3918 3919.. option:: -gsplit-dwarf, -gno-split-dwarf 3920 3921.. program:: clang1 3922.. option:: -gsplit-dwarf=<arg> 3923.. program:: clang 3924 3925Set DWARF fission mode to either 'split' or 'single' 3926 3927.. option:: -gstrict-dwarf, -gno-strict-dwarf 3928 3929.. option:: -gz=<arg>, -gz (equivalent to -gz=zlib) 3930 3931DWARF debug sections compression type 3932 3933Static analyzer flags 3934===================== 3935 3936Flags controlling the behavior of the Clang Static Analyzer. 3937 3938.. option:: -Xanalyzer <arg> 3939 3940Pass <arg> to the static analyzer 3941 3942Fortran compilation flags 3943========================= 3944 3945Flags that will be passed onto the ``gfortran`` compiler when Clang is given 3946a Fortran input. 3947 3948.. option:: -A<arg>, --assert <arg>, --assert=<arg> 3949 3950.. option:: -A-<arg> 3951 3952.. option:: -faggressive-function-elimination, -fno-aggressive-function-elimination 3953 3954.. option:: -falign-commons, -fno-align-commons 3955 3956.. option:: -fall-intrinsics, -fno-all-intrinsics 3957 3958.. option:: -fbacktrace, -fno-backtrace 3959 3960.. option:: -fblas-matmul-limit=<arg> 3961 3962.. option:: -fbounds-check, -fno-bounds-check 3963 3964.. option:: -fcheck-array-temporaries, -fno-check-array-temporaries 3965 3966.. option:: -fcheck=<arg> 3967 3968.. option:: -fcoarray=<arg> 3969 3970.. option:: -fconvert=<arg> 3971 3972.. option:: -fcray-pointer, -fno-cray-pointer 3973 3974.. option:: -fd-lines-as-code, -fno-d-lines-as-code 3975 3976.. option:: -fd-lines-as-comments, -fno-d-lines-as-comments 3977 3978.. option:: -fdollar-ok, -fno-dollar-ok 3979 3980.. option:: -fdump-fortran-optimized, -fno-dump-fortran-optimized 3981 3982.. option:: -fdump-fortran-original, -fno-dump-fortran-original 3983 3984.. option:: -fdump-parse-tree, -fno-dump-parse-tree 3985 3986.. option:: -fexternal-blas, -fno-external-blas 3987 3988.. option:: -ff2c, -fno-f2c 3989 3990.. option:: -ffpe-trap=<arg> 3991 3992.. option:: -ffree-line-length-<arg> 3993 3994.. option:: -ffrontend-optimize, -fno-frontend-optimize 3995 3996.. option:: -finit-character=<arg> 3997 3998.. option:: -finit-integer=<arg> 3999 4000.. option:: -finit-local-zero, -fno-init-local-zero 4001 4002.. option:: -finit-logical=<arg> 4003 4004.. option:: -finit-real=<arg> 4005 4006.. option:: -finteger-4-integer-8, -fno-integer-4-integer-8 4007 4008.. option:: -fmax-array-constructor=<arg> 4009 4010.. option:: -fmax-errors=<arg> 4011 4012.. option:: -fmax-identifier-length, -fno-max-identifier-length 4013 4014.. option:: -fmax-stack-var-size=<arg> 4015 4016.. option:: -fmax-subrecord-length=<arg> 4017 4018.. option:: -fmodule-private, -fno-module-private 4019 4020.. option:: -fpack-derived, -fno-pack-derived 4021 4022.. option:: -frange-check, -fno-range-check 4023 4024.. option:: -freal-4-real-10, -fno-real-4-real-10 4025 4026.. option:: -freal-4-real-16, -fno-real-4-real-16 4027 4028.. option:: -freal-4-real-8, -fno-real-4-real-8 4029 4030.. option:: -freal-8-real-10, -fno-real-8-real-10 4031 4032.. option:: -freal-8-real-16, -fno-real-8-real-16 4033 4034.. option:: -freal-8-real-4, -fno-real-8-real-4 4035 4036.. option:: -frealloc-lhs, -fno-realloc-lhs 4037 4038.. option:: -frecord-marker=<arg> 4039 4040.. option:: -frecursive, -fno-recursive 4041 4042.. option:: -frepack-arrays, -fno-repack-arrays 4043 4044.. option:: -fsecond-underscore, -fno-second-underscore 4045 4046.. option:: -fsign-zero, -fno-sign-zero 4047 4048.. option:: -fstack-arrays, -fno-stack-arrays 4049 4050.. option:: -funderscoring, -fno-underscoring 4051 4052.. option:: -fwhole-file, -fno-whole-file 4053 4054.. option:: -imultilib <arg> 4055 4056.. option:: -static-libgfortran 4057 4058Linker flags 4059============ 4060Flags that are passed on to the linker 4061 4062.. option:: -L<dir>, --library-directory <arg>, --library-directory=<arg> 4063 4064Add directory to library search path 4065 4066.. option:: -Mach 4067 4068.. option:: -T<script> 4069 4070Specify <script> as linker script 4071 4072.. option:: -Tbss<addr> 4073 4074Set starting address of BSS to <addr> 4075 4076.. option:: -Tdata<addr> 4077 4078Set starting address of DATA to <addr> 4079 4080.. option:: -Ttext<addr> 4081 4082Set starting address of TEXT to <addr> 4083 4084.. option:: -Wl,<arg>,<arg2>... 4085 4086Pass the comma separated arguments in <arg> to the linker 4087 4088.. option:: -X 4089 4090.. option:: -Xlinker <arg>, --for-linker <arg>, --for-linker=<arg> 4091 4092Pass <arg> to the linker 4093 4094.. program:: clang1 4095.. option:: -Z 4096.. program:: clang 4097 4098.. option:: -b<arg> 4099 4100Pass -b <arg> to the linker on AIX (only). 4101 4102.. option:: -coverage, --coverage 4103 4104.. option:: -e<arg>, --entry 4105 4106.. option:: -filelist <arg> 4107 4108.. option:: --hip-device-lib=<arg> 4109 4110HIP device library 4111 4112.. option:: --hipspv-pass-plugin=<dsopath> 4113 4114path to a pass plugin for HIP to SPIR-V passes. 4115 4116.. option:: -l<arg> 4117 4118.. option:: --ld-path=<arg> 4119 4120.. option:: -nostartfiles 4121 4122.. program:: clang1 4123.. option:: -nostdlib, --no-standard-libraries 4124.. program:: clang 4125 4126.. option:: -pie 4127 4128.. option:: -r 4129 4130.. option:: -rdynamic 4131 4132.. option:: --rocm-device-lib-path=<arg>, --hip-device-lib-path=<arg> 4133 4134ROCm device library path. Alternative to rocm-path. 4135 4136.. option:: -rpath <arg> 4137 4138.. option:: -s 4139 4140.. option:: -shared, --shared 4141 4142.. option:: -specs=<arg>, --specs=<arg> 4143 4144.. option:: -static, --static 4145 4146.. option:: -static-pie 4147 4148.. option:: -t 4149 4150.. option:: -u<arg>, --force-link <arg>, --force-link=<arg> 4151 4152.. option:: -undef 4153 4154undef all system defines 4155 4156.. option:: -undefined<arg>, --no-undefined 4157 4158.. option:: -z <arg> 4159 4160Pass -z <arg> to the linker 4161 4162