gcc/fortran/lang.opt

   1 ; Options for the Fortran front end.
   2 ; Copyright (C) 2003-2019 Free Software Foundation, Inc.
   3 ;
   4 ; This file is part of GCC.
   5 ;
   6 ; GCC is free software; you can redistribute it and/or modify it under
   7 ; the terms of the GNU General Public License as published by the Free
   8 ; Software Foundation; either version 3, or (at your option) any later
   9 ; version.
  10 ;
  11 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 ; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 ; for more details.
  15 ;
  16 ; You should have received a copy of the GNU General Public License
  17 ; along with GCC; see the file COPYING3.  If not see
  18 ; <http://www.gnu.org/licenses/>.
  19
  20 ; See the GCC internals manual for a description of this file's format.
  21
  22 ; Please try to keep this file in ASCII collating order.
  23
  24 Language
  25 Fortran
  26
  27 -all-warnings
  28 Fortran Alias(Wall)
  29
  30 -assert
  31 Fortran Separate Alias(A)
  32
  33 -assert=
  34 Fortran Joined Alias(A)
  35
  36 -comments
  37 Fortran Alias(C)
  38
  39 -comments-in-macros
  40 Fortran Alias(CC)
  41
  42 -define-macro
  43 Fortran Separate Alias(D)
  44
  45 -define-macro=
  46 Fortran Joined Alias(D)
  47
  48 -dependencies
  49 Fortran Alias(M)
  50
  51 -dump
  52 Fortran Separate Alias(d)
  53
  54 -dump=
  55 Fortran Joined Alias(d)
  56
  57 -include-barrier
  58 Fortran Alias(I, -)
  59
  60 -include-directory
  61 Fortran Separate Alias(I)
  62
  63 -include-directory=
  64 Fortran Joined Alias(I)
  65
  66 -include-directory-after
  67 Fortran Separate Alias(idirafter)
  68
  69 -include-directory-after=
  70 Fortran Joined Alias(idirafter)
  71
  72 -include-prefix
  73 Fortran Separate Alias(iprefix)
  74
  75 -include-prefix=
  76 Fortran JoinedOrMissing Alias(iprefix)
  77
  78 -no-line-commands
  79 Fortran Alias(P)
  80
  81 -no-standard-includes
  82 Fortran Alias(nostdinc)
  83
  84 -output
  85 Fortran Separate Alias(o)
  86
  87 -output=
  88 Fortran Joined Alias(o)
  89
  90 -preprocess
  91 Fortran Undocumented Alias(E)
  92
  93 -print-missing-file-dependencies
  94 Fortran Alias(MG)
  95
  96 -trace-includes
  97 Fortran Alias(H)
  98
  99 -undefine-macro
 100 Fortran Separate Alias(U)
 101
 102 -undefine-macro=
 103 Fortran Joined Alias(U)
 104
 105 -user-dependencies
 106 Fortran Alias(MM)
 107
 108 -verbose
 109 Fortran Alias(v)
 110
 111 -write-dependencies
 112 Fortran NoDriverArg Separate Alias(MD)
 113
 114 -write-user-dependencies
 115 Fortran NoDriverArg Separate Alias(MMD)
 116
 117 A
 118 Fortran Joined Separate
 119 ; Documented in C
 120
 121 C
 122 Fortran
 123 ; Documented in C
 124
 125 CC
 126 Fortran
 127 ; Documented in C
 128
 129 D
 130 Fortran Joined Separate
 131 ; Documented in C
 132
 133 E
 134 Fortran Undocumented
 135
 136 H
 137 Fortran
 138 ; Documented in C
 139
 140 I
 141 Fortran Joined Separate
 142 ; Documented in C
 143
 144 J
 145 Fortran Joined Separate
 146 -J<directory>   Put MODULE files in 'directory'.
 147
 148 M
 149 Fortran
 150 ; Documented in C
 151
 152 MD
 153 Fortran Separate NoDriverArg
 154 ; Documented in C
 155
 156 MF
 157 Fortran Joined Separate
 158 ; Documented in C
 159
 160 MG
 161 Fortran
 162 ; Documented in C
 163
 164 MM
 165 Fortran
 166 ; Documented in C
 167
 168 MMD
 169 Fortran Separate NoDriverArg
 170 ; Documented in C
 171
 172 MP
 173 Fortran
 174 ; Documented in C
 175
 176 MT
 177 Fortran Joined Separate
 178 ; Documented in C
 179
 180 MQ
 181 Fortran Joined Separate
 182 ; Documented in C
 183
 184 P
 185 Fortran
 186 ; Documented in C
 187
 188 U
 189 Fortran Joined Separate
 190 ; Documented in C
 191
 192 Wall
 193 Fortran
 194 ; Documented in C
 195
 196 Waliasing
 197 Fortran Warning Var(warn_aliasing) LangEnabledBy(Fortran,Wall)
 198 Warn about possible aliasing of dummy arguments.
 199
 200 Walign-commons
 201 Fortran Warning Var(warn_align_commons) Init(1)
 202 Warn about alignment of COMMON blocks.
 203
 204 Wampersand
 205 Fortran Warning Var(warn_ampersand) LangEnabledBy(Fortran,Wall || Wpedantic)
 206 Warn about missing ampersand in continued character constants.
 207
 208 Warray-temporaries
 209 Fortran Warning Var(warn_array_temporaries)
 210 Warn about creation of array temporaries.
 211
 212 Wargument-mismatch
 213 Fortran WarnRemoved
 214 Does nothing. Preserved for backward compatibility.
 215
 216 Wc-binding-type
 217 Fortran Var(warn_c_binding_type) Warning LangEnabledBy(Fortran,Wall)
 218 Warn if the type of a variable might be not interoperable with C.
 219
 220 Wdate-time
 221 Fortran
 222 ; Documented in C
 223
 224 Wcharacter-truncation
 225 Fortran Var(warn_character_truncation) Warning LangEnabledBy(Fortran,Wall)
 226 Warn about truncated character expressions.
 227
 228 Wcompare-reals
 229 Fortran Warning Var(warn_compare_reals) LangEnabledBy(Fortran,Wextra)
 230 Warn about equality comparisons involving REAL or COMPLEX expressions.
 231
 232 Wconversion
 233 Fortran Var(warn_conversion) Warning LangEnabledBy(Fortran,Wall)
 234 ; Documented in C
 235
 236 Wconversion-extra
 237 Fortran Var(warn_conversion_extra) Warning
 238 Warn about most implicit conversions.
 239
 240 Wdo-subscript
 241 Fortran Var(warn_do_subscript) Warning LangEnabledBy(Fortran,Wextra)
 242 Warn about possibly incorrect subscripts in do loops.
 243
 244 Wextra
 245 Fortran Warning
 246 ; Documented in common
 247
 248 Wfrontend-loop-interchange
 249 Fortran Var(flag_warn_frontend_loop_interchange)
 250 Warn if loops have been interchanged.
 251
 252 Wfunction-elimination
 253 Fortran Warning Var(warn_function_elimination) LangEnabledBy(Fortran,Wextra)
 254 Warn about function call elimination.
 255
 256 Wimplicit-interface
 257 Fortran Warning Var(warn_implicit_interface)
 258 Warn about calls with implicit interface.
 259
 260 Wimplicit-procedure
 261 Fortran Warning Var(warn_implicit_procedure)
 262 Warn about called procedures not explicitly declared.
 263
 264 Winteger-division
 265 Fortran Warning Var(warn_integer_division) LangEnabledBy(Fortran,Wall)
 266 Warn about constant integer divisions with truncated results.
 267
 268 Wline-truncation
 269 Fortran Warning Var(warn_line_truncation) LangEnabledBy(Fortran,Wall) Init(-1)
 270 Warn about truncated source lines.
 271
 272 Wintrinsics-std
 273 Fortran Var(warn_intrinsics_std) Warning LangEnabledBy(Fortran,Wall)
 274 Warn on intrinsics not part of the selected standard.
 275
 276 Wmaybe-uninitialized
 277 Fortran LangEnabledBy(Fortran,Wall)
 278 ; Documented in common.opt
 279
 280 Wmissing-include-dirs
 281 Fortran
 282 ; Documented in C/C++
 283
 284 Wuse-without-only
 285 Fortran Var(warn_use_without_only) Warning
 286 Warn about USE statements that have no ONLY qualifier.
 287
 288 Wopenmp-simd
 289 Fortran
 290 ; Documented in C
 291
 292 Woverwrite-recursive
 293 Fortran Warning Var(warn_overwrite_recursive) Init(1)
 294 Warn that -fno-automatic may break recursion.
 295
 296 Wpedantic
 297 Fortran
 298 ; Documented in common.opt
 299
 300 Wreal-q-constant
 301 Fortran Warning Var(warn_real_q_constant) LangEnabledBy(Fortran,Wall)
 302 Warn about real-literal-constants with 'q' exponent-letter.
 303
 304 Wrealloc-lhs
 305 Fortran Warning Var(warn_realloc_lhs) LangEnabledBy(Fortran,Wrealloc-lhs-all)
 306 Warn when a left-hand-side array variable is reallocated.
 307
 308 Wrealloc-lhs-all
 309 Fortran Warning Var(warn_realloc_lhs_all)
 310 Warn when a left-hand-side variable is reallocated.
 311
 312 Wtarget-lifetime
 313 Fortran Warning Var(warn_target_lifetime) LangEnabledBy(Fortran,Wall)
 314 Warn if the pointer in a pointer assignment might outlive its target.
 315
 316 Wreturn-type
 317 Fortran Warning LangEnabledBy(Fortran,Wall)
 318 ; Documented in C
 319
 320 Wsurprising
 321 Fortran Warning Var(warn_surprising) LangEnabledBy(Fortran,Wall)
 322 Warn about \"suspicious\" constructs.
 323
 324 Wtabs
 325 Fortran Warning Var(warn_tabs) LangEnabledBy(Fortran,Wall || Wpedantic)
 326 Permit nonconforming uses of the tab character.
 327
 328 Wundefined-do-loop
 329 Fortran Warning Var(warn_undefined_do_loop) LangEnabledBy(Fortran,Wall)
 330 Warn about an invalid DO loop.
 331
 332 Wunderflow
 333 Fortran Warning Var(warn_underflow) Init(1)
 334 Warn about underflow of numerical constant expressions.
 335
 336 Wuninitialized
 337 Fortran LangEnabledBy(Fortran,Wall)
 338 ; Documented in common.opt
 339
 340 Wintrinsic-shadow
 341 Fortran Warning Var(warn_intrinsic_shadow) LangEnabledBy(Fortran,Wall)
 342 Warn if a user-procedure has the same name as an intrinsic.
 343
 344 Wunused
 345 LangEnabledBy(Fortran,Wall)
 346 ; Documented in common.opt
 347
 348 Wunused-dummy-argument
 349 Fortran Warning Var(warn_unused_dummy_argument) LangEnabledBy(Fortran,Wall)
 350 Warn about unused dummy arguments.
 351
 352 Wzerotrip
 353 Fortran Warning Var(warn_zerotrip) LangEnabledBy(Fortran,Wall)
 354 Warn about zero-trip DO loops.
 355
 356 cpp
 357 Fortran Negative(nocpp)
 358 Enable preprocessing.
 359
 360 cpp=
 361 Fortran Joined Negative(nocpp) Undocumented NoDWARFRecord
 362 ; Internal option generated by specs from -cpp.
 363
 364 nocpp
 365 Fortran Negative(cpp)
 366 Disable preprocessing.
 367
 368 d
 369 Fortran Joined
 370 ; Documented in common.opt
 371
 372 fallow-argument-mismatch
 373 Fortran Var(flag_allow_argument_mismatch) LangEnabledBy(Fortran,std=legacy)
 374 Accept argument mismatches in procedure calls.
 375
 376 faggressive-function-elimination
 377 Fortran Var(flag_aggressive_function_elimination)
 378 Eliminate multiple function invocations also for impure functions.
 379
 380 falign-commons
 381 Fortran Var(flag_align_commons) Init(1)
 382 Enable alignment of COMMON blocks.
 383
 384 fall-intrinsics
 385 Fortran RejectNegative Var(flag_all_intrinsics)
 386 All intrinsics procedures are available regardless of selected standard.
 387
 388 fallow-invalid-boz
 389 Fortran RejectNegative Var(flag_allow_invalid_boz)
 390 Allow a BOZ literal constant to appear in an invalid context.
 391
 392 fallow-leading-underscore
 393 Fortran Undocumented Var(flag_allow_leading_underscore)
 394 ; For internal use only: allow the first character of symbol names to be an underscore
 395
 396 fautomatic
 397 Fortran Var(flag_automatic) Init(1)
 398 Do not treat local variables and COMMON blocks as if they were named in SAVE statements.
 399
 400 fbackslash
 401 Fortran Var(flag_backslash)
 402 Specify that backslash in string introduces an escape character.
 403
 404 fbacktrace
 405 Fortran Var(flag_backtrace) Init(1)
 406 Produce a backtrace when a runtime error is encountered.
 407
 408 fblas-matmul-limit=
 409 Fortran RejectNegative Joined UInteger Var(flag_blas_matmul_limit) Init(30)
 410 -fblas-matmul-limit=<n> Size of the smallest matrix for which matmul will use BLAS.
 411
 412 fcheck-array-temporaries
 413 Fortran
 414 Produce a warning at runtime if a array temporary has been created for a procedure argument.
 415
 416 fconvert=
 417 Fortran RejectNegative Joined Enum(gfc_convert) Var(flag_convert) Init(GFC_FLAG_CONVERT_NATIVE)
 418 -fconvert=<big-endian|little-endian|native|swap> The endianness used for unformatted files.
 419
 420 Enum
 421 Name(gfc_convert) Type(enum gfc_convert) UnknownError(Unrecognized option to endianness value: %qs)
 422
 423 EnumValue
 424 Enum(gfc_convert) String(big-endian) Value(GFC_FLAG_CONVERT_BIG)
 425
 426 EnumValue
 427 Enum(gfc_convert) String(little-endian) Value(GFC_FLAG_CONVERT_LITTLE)
 428
 429 EnumValue
 430 Enum(gfc_convert) String(native) Value(GFC_FLAG_CONVERT_NATIVE)
 431
 432 EnumValue
 433 Enum(gfc_convert) String(swap) Value(GFC_FLAG_CONVERT_SWAP)
 434
 435 fcray-pointer
 436 Fortran Var(flag_cray_pointer)
 437 Use the Cray Pointer extension.
 438
 439 fc-prototypes
 440 Fortran Var(flag_c_prototypes)
 441 Generate C prototypes from BIND(C) declarations.
 442
 443 fc-prototypes-external
 444 Fortran Var(flag_c_prototypes_external)
 445 Generate C prototypes from non-BIND(C) external procedure definitions.
 446
 447 fd-lines-as-code
 448 Fortran RejectNegative
 449 Ignore 'D' in column one in fixed form.
 450
 451 fd-lines-as-comments
 452 Fortran RejectNegative
 453 Treat lines with 'D' in column one as comments.
 454
 455 fdec
 456 Fortran Var(flag_dec)
 457 Enable all DEC language extensions.
 458
 459 fdec-blank-format-item
 460 Fortran Var(flag_dec_blank_format_item)
 461 Enable the use of blank format items in format strings.
 462
 463 fdec-char-conversions
 464 Fortran Var(flag_dec_char_conversions)
 465 Enable the use of character literals in assignments and data statements
 466 for non-character variables.
 467
 468 fdec-include
 469 Fortran Var(flag_dec_include)
 470 Enable legacy parsing of INCLUDE as statement.
 471
 472 fdec-format-defaults
 473 Fortran Var(flag_dec_format_defaults)
 474 Enable default widths for i, f and g format specifiers.
 475
 476 fdec-intrinsic-ints
 477 Fortran Var(flag_dec_intrinsic_ints)
 478 Enable kind-specific variants of integer intrinsic functions.
 479
 480 fdec-math
 481 Fortran Var(flag_dec_math)
 482 Enable legacy math intrinsics for compatibility.
 483
 484 fdec-structure
 485 Fortran Var(flag_dec_structure)
 486 Enable support for DEC STRUCTURE/RECORD.
 487
 488 fdec-static
 489 Fortran Var(flag_dec_static)
 490 Enable DEC-style STATIC and AUTOMATIC attributes.
 491
 492 fdefault-double-8
 493 Fortran Var(flag_default_double)
 494 Set the default double precision kind to an 8 byte wide type.
 495
 496 fdefault-integer-8
 497 Fortran Var(flag_default_integer)
 498 Set the default integer kind to an 8 byte wide type.
 499
 500 fdefault-real-8
 501 Fortran Var(flag_default_real_8)
 502 Set the default real kind to an 8 byte wide type.
 503
 504 fdefault-real-10
 505 Fortran Var(flag_default_real_10)
 506 Set the default real kind to an 10 byte wide type.
 507
 508 fdefault-real-16
 509 Fortran Var(flag_default_real_16)
 510 Set the default real kind to an 16 byte wide type.
 511
 512 fdollar-ok
 513 Fortran Var(flag_dollar_ok)
 514 Allow dollar signs in entity names.
 515
 516 fdump-core
 517 Fortran Ignore
 518 Does nothing. Preserved for backward compatibility.
 519
 520 fdump-fortran-original
 521 Fortran Var(flag_dump_fortran_original)
 522 Display the code tree after parsing.
 523
 524 fdump-fortran-optimized
 525 Fortran Var(flag_dump_fortran_optimized)
 526 Display the code tree after front end optimization.
 527
 528 fdump-fortran-global
 529 Fortran Var(flag_dump_fortran_global)
 530 Display the global symbol table after parsing.
 531
 532 fdump-parse-tree
 533 Fortran Alias(fdump-fortran-original)
 534 Display the code tree after parsing; deprecated option.
 535
 536 fexternal-blas
 537 Fortran Var(flag_external_blas)
 538 Specify that an external BLAS library should be used for matmul calls on large-size arrays.
 539
 540 ff2c
 541 Fortran Var(flag_f2c)
 542 Use f2c calling convention.
 543
 544 ffixed-form
 545 Fortran RejectNegative
 546 Assume that the source file is fixed form.
 547
 548 ftest-forall-temp
 549 Fortran Var(flag_test_forall_temp) Init(0)
 550 Force creation of temporary to test infrequently-executed forall code.
 551
 552 finteger-4-integer-8
 553 Fortran RejectNegative Var(flag_integer4_kind,8)
 554 Interpret any INTEGER(4) as an INTEGER(8).
 555
 556 fintrinsic-modules-path
 557 Fortran RejectNegative Separate
 558 Specify where to find the compiled intrinsic modules.
 559
 560 fintrinsic-modules-path=
 561 Fortran RejectNegative Joined
 562 Specify where to find the compiled intrinsic modules.
 563
 564 ffixed-line-length-none
 565 Fortran RejectNegative Var(flag_fixed_line_length,0)
 566 Allow arbitrary character line width in fixed mode.
 567
 568 ffixed-line-length-
 569 Fortran RejectNegative Joined UInteger Var(flag_fixed_line_length) Init(72)
 570 -ffixed-line-length-<n> Use n as character line width in fixed mode.
 571
 572 fpad-source
 573 Fortran Var(flag_pad_source) Init(1)
 574 Pad shorter fixed form lines to line width with spaces.
 575
 576 ffpe-trap=
 577 Fortran RejectNegative JoinedOrMissing
 578 -ffpe-trap=[...]        Stop on following floating point exceptions.
 579
 580 ffpe-summary=
 581 Fortran RejectNegative JoinedOrMissing
 582 -ffpe-summary=[...]     Print summary of floating point exceptions.
 583
 584 ffree-form
 585 Fortran RejectNegative
 586 Assume that the source file is free form.
 587
 588 ffree-line-length-none
 589 Fortran RejectNegative Var(flag_free_line_length,0)
 590 Allow arbitrary character line width in free mode.
 591
 592 ffree-line-length-
 593 Fortran RejectNegative Joined UInteger Var(flag_free_line_length) Init(132)
 594 -ffree-line-length-<n>  Use n as character line width in free mode.
 595
 596 ffrontend-loop-interchange
 597 Fortran Var(flag_frontend_loop_interchange) Init(-1)
 598 Try to interchange loops if profitable.
 599
 600 ffrontend-optimize
 601 Fortran Var(flag_frontend_optimize) Init(-1)
 602 Enable front end optimization.
 603
 604 fimplicit-none
 605 Fortran Var(flag_implicit_none)
 606 Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements.
 607
 608 finit-character=
 609 Fortran RejectNegative Joined UInteger
 610 -finit-character=<n>    Initialize local character variables to ASCII value n.
 611
 612 finit-derived
 613 Fortran Var(flag_init_derived)
 614 Initialize components of derived type variables according to other init flags.
 615
 616 finit-integer=
 617 Fortran RejectNegative Joined
 618 -finit-integer=<n>      Initialize local integer variables to n.
 619
 620 finit-local-zero
 621 Fortran
 622 Initialize local variables to zero (from g77).
 623
 624 finit-logical=
 625 Fortran RejectNegative Joined
 626 -finit-logical=<true|false>     Initialize local logical variables.
 627
 628 finit-real=
 629 Fortran RejectNegative ToLower Joined Enum(gfc_init_local_real) Var(flag_init_real) Init(GFC_INIT_REAL_OFF)
 630 -finit-real=<zero|snan|nan|inf|-inf>    Initialize local real variables.
 631
 632 Enum
 633 Name(gfc_init_local_real) Type(enum gfc_init_local_real) UnknownError(Unrecognized option to floating-point init value: %qs)
 634
 635 EnumValue
 636 Enum(gfc_init_local_real) String(zero) Value(GFC_INIT_REAL_ZERO)
 637
 638 EnumValue
 639 Enum(gfc_init_local_real) String(snan) Value(GFC_INIT_REAL_SNAN)
 640
 641 EnumValue
 642 Enum(gfc_init_local_real) String(nan) Value(GFC_INIT_REAL_NAN)
 643
 644 EnumValue
 645 Enum(gfc_init_local_real) String(inf) Value(GFC_INIT_REAL_INF)
 646
 647 EnumValue
 648 Enum(gfc_init_local_real) String(-inf) Value(GFC_INIT_REAL_NEG_INF)
 649
 650 finline-arg-packing
 651 Fortran  Var(flag_inline_arg_packing) Init(-1)
 652 -finline-arg-packing    Perform argument packing inline
 653
 654 finline-matmul-limit=
 655 Fortran RejectNegative Joined UInteger Var(flag_inline_matmul_limit) Init(-1)
 656 -finline-matmul-limit=<n>       Specify the size of the largest matrix for which matmul will be inlined.
 657
 658 fmax-array-constructor=
 659 Fortran RejectNegative Joined UInteger Var(flag_max_array_constructor) Init(65535)
 660 -fmax-array-constructor=<n>     Maximum number of objects in an array constructor.
 661
 662 fmax-identifier-length=
 663 Fortran RejectNegative Joined UInteger
 664 -fmax-identifier-length=<n>     Maximum identifier length.
 665
 666 fmax-subrecord-length=
 667 Fortran RejectNegative Joined UInteger Var(flag_max_subrecord_length)
 668 -fmax-subrecord-length=<n>      Maximum length for subrecords.
 669
 670 fmax-stack-var-size=
 671 Fortran RejectNegative Joined UInteger Var(flag_max_stack_var_size) Init(-2)
 672 -fmax-stack-var-size=<n>        Size in bytes of the largest array that will be put on the stack.
 673
 674 fstack-arrays
 675 Fortran Var(flag_stack_arrays) Init(-1)
 676 Put all local arrays on stack.
 677
 678 fmodule-private
 679 Fortran Var(flag_module_private)
 680 Set default accessibility of module entities to PRIVATE.
 681
 682 fopenacc
 683 Fortran LTO
 684 ; Documented in C
 685
 686 fopenacc-dim=
 687 Fortran LTO Joined Var(flag_openacc_dims)
 688 ; Documented in C
 689
 690 fopenmp
 691 Fortran LTO
 692 ; Documented in C
 693
 694 fopenmp-simd
 695 Fortran
 696 ; Documented in C
 697
 698 fpack-derived
 699 Fortran Var(flag_pack_derived)
 700 Try to lay out derived types as compactly as possible.
 701
 702 fpreprocessed
 703 Fortran
 704 ; Documented in C
 705
 706 fprotect-parens
 707 Fortran Var(flag_protect_parens) Init(-1)
 708 Protect parentheses in expressions.
 709
 710 fpre-include=
 711 Fortran RejectNegative Joined Var(flag_pre_include) Undocumented
 712 Path to header file that should be pre-included before each compilation unit.
 713
 714 frange-check
 715 Fortran Var(flag_range_check) Init(1)
 716 Enable range checking during compilation.
 717
 718 freal-4-real-8
 719 Fortran RejectNegative Var(flag_real4_kind,8)
 720 Interpret any REAL(4) as a REAL(8).
 721
 722 freal-4-real-10
 723 Fortran RejectNegative Var(flag_real4_kind,10)
 724 Interpret any REAL(4) as a REAL(10).
 725
 726 freal-4-real-16
 727 Fortran RejectNegative Var(flag_real4_kind,16)
 728 Interpret any REAL(4) as a REAL(16).
 729
 730 freal-8-real-4
 731 Fortran RejectNegative Var(flag_real8_kind,4)
 732 Interpret any REAL(8) as a REAL(4).
 733
 734 freal-8-real-10
 735 Fortran RejectNegative Var(flag_real8_kind,10)
 736 Interpret any REAL(8) as a REAL(10).
 737
 738 freal-8-real-16
 739 Fortran RejectNegative Var(flag_real8_kind,16)
 740 Interpret any REAL(8) as a REAL(16).
 741
 742 frealloc-lhs
 743 Fortran Var(flag_realloc_lhs) Init(-1)
 744 Reallocate the LHS in assignments.
 745
 746 frecord-marker=4
 747 Fortran RejectNegative Var(flag_record_marker,4)
 748 Use a 4-byte record marker for unformatted files.
 749
 750 frecord-marker=8
 751 Fortran RejectNegative Var(flag_record_marker,8)
 752 Use an 8-byte record marker for unformatted files.
 753
 754 frecursive
 755 Fortran Var(flag_recursive)
 756 Allocate local variables on the stack to allow indirect recursion.
 757
 758 frepack-arrays
 759 Fortran Var(flag_repack_arrays)
 760 Copy array sections into a contiguous block on procedure entry.
 761
 762 fcoarray=
 763 Fortran RejectNegative Joined Enum(gfc_fcoarray) Var(flag_coarray) Init(GFC_FCOARRAY_NONE)
 764 -fcoarray=<none|single|lib>     Specify which coarray parallelization should be used.
 765
 766 Enum
 767 Name(gfc_fcoarray) Type(enum gfc_fcoarray) UnknownError(Unrecognized option: %qs)
 768
 769 EnumValue
 770 Enum(gfc_fcoarray) String(none) Value(GFC_FCOARRAY_NONE)
 771
 772 EnumValue
 773 Enum(gfc_fcoarray) String(single) Value(GFC_FCOARRAY_SINGLE)
 774
 775 EnumValue
 776 Enum(gfc_fcoarray) String(lib) Value(GFC_FCOARRAY_LIB)
 777
 778 fcheck=
 779 Fortran RejectNegative JoinedOrMissing
 780 -fcheck=[...]   Specify which runtime checks are to be performed.
 781
 782 fsecond-underscore
 783 Fortran Var(flag_second_underscore) Init(-1)
 784 Append a second underscore if the name already contains an underscore.
 785
 786 fshort-enums
 787 Fortran Var(flag_short_enums)
 788 ; Documented in C
 789
 790 fsign-zero
 791 Fortran Var(flag_sign_zero) Init(1)
 792 Apply negative sign to zero values.
 793
 794 ftail-call-workaround
 795 Fortran Alias(ftail-call-workaround=,1,0)
 796
 797 ftail-call-workaround=
 798 Fortran RejectNegative Joined UInteger IntegerRange(0, 2) Var(flag_tail_call_workaround) Init(1)
 799 Disallow tail call optimization when a calling routine may have omitted character lengths.
 800
 801 funderscoring
 802 Fortran Var(flag_underscoring) Init(1)
 803 Append underscores to externally visible names.
 804
 805 fwhole-file
 806 Fortran Ignore
 807 Does nothing.  Preserved for backward compatibility.
 808
 809 fworking-directory
 810 Fortran
 811 ; Documented in C
 812
 813 idirafter
 814 Fortran Joined Separate
 815 ; Documented in C
 816
 817 imultilib
 818 Fortran Joined Separate
 819 ; Documented in C
 820
 821 iprefix
 822 Fortran Joined Separate
 823 ; Documented in C
 824
 825 iquote
 826 Fortran Joined Separate
 827 ; Documented in C
 828
 829 isysroot
 830 Fortran Joined Separate
 831 ; Documented in C
 832
 833 isystem
 834 Fortran Joined Separate
 835 ; Documented in C
 836
 837 nostdinc
 838 Fortran
 839 ; Documented in C
 840
 841 o
 842 Fortran Joined Separate
 843 ; Documented in common.opt
 844
 845 static-libgfortran
 846 Fortran
 847 Statically link the GNU Fortran helper library (libgfortran).
 848
 849 std=f2003
 850 Fortran
 851 Conform to the ISO Fortran 2003 standard.
 852
 853 std=f2008
 854 Fortran
 855 Conform to the ISO Fortran 2008 standard.
 856
 857 std=f2008ts
 858 Fortran
 859 Conform to the ISO Fortran 2008 standard including TS 29113.
 860
 861 std=f2018
 862 Fortran
 863 Conform to the ISO Fortran 2018 standard.
 864
 865 std=f95
 866 Fortran
 867 Conform to the ISO Fortran 95 standard.
 868
 869 std=gnu
 870 Fortran
 871 Conform to nothing in particular.
 872
 873 std=legacy
 874 Fortran
 875 Accept extensions to support legacy code.
 876
 877 undef
 878 Fortran
 879 ; Documented in C
 880
 881 v
 882 Fortran
 883 ; Documented in C
 884
 885 ; This comment is to ensure we retain the blank line above.