gcc/fortran/lang.opt

   1 ; Options for the Fortran 95 front end.
   2 ; Copyright (C) 2003-2017 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 Warning Var(warn_argument_mismatch) Init(1)
 214 Warn about type and rank mismatches between arguments and parameters.
 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 Wextra
 241 Fortran Warning
 242 ; Documented in common
 243
 244 Wfunction-elimination
 245 Fortran Warning Var(warn_function_elimination)
 246 Warn about function call elimination.
 247
 248 Wimplicit-interface
 249 Fortran Warning Var(warn_implicit_interface)
 250 Warn about calls with implicit interface.
 251
 252 Wimplicit-procedure
 253 Fortran Warning Var(warn_implicit_procedure)
 254 Warn about called procedures not explicitly declared.
 255
 256 Winteger-division
 257 Fortran Warning Var(warn_integer_division) LangEnabledBy(Fortran,Wall)
 258 Warn about constant integer divisions with truncated results.
 259
 260 Wline-truncation
 261 Fortran Warning Var(warn_line_truncation) LangEnabledBy(Fortran,Wall) Init(-1)
 262 Warn about truncated source lines.
 263
 264 Wintrinsics-std
 265 Fortran Var(warn_intrinsics_std) Warning LangEnabledBy(Fortran,Wall)
 266 Warn on intrinsics not part of the selected standard.
 267
 268 Wmaybe-uninitialized
 269 Fortran LangEnabledBy(Fortran,Wall)
 270 ; Documented in common.opt
 271
 272 Wmissing-include-dirs
 273 Fortran
 274 ; Documented in C/C++
 275
 276 Wuse-without-only
 277 Fortran Var(warn_use_without_only) Warning
 278 Warn about USE statements that have no ONLY qualifier.
 279
 280 Wopenmp-simd
 281 Fortran
 282 ; Documented in C
 283
 284 Wpedantic
 285 Fortran
 286 ; Documented in common.opt
 287
 288 Wreal-q-constant
 289 Fortran Warning Var(warn_real_q_constant) LangEnabledBy(Fortran,Wall)
 290 Warn about real-literal-constants with 'q' exponent-letter.
 291
 292 Wrealloc-lhs
 293 Fortran Warning Var(warn_realloc_lhs) LangEnabledBy(Fortran,Wrealloc-lhs-all)
 294 Warn when a left-hand-side array variable is reallocated.
 295
 296 Wrealloc-lhs-all
 297 Fortran Warning Var(warn_realloc_lhs_all)
 298 Warn when a left-hand-side variable is reallocated.
 299
 300 Wtarget-lifetime
 301 Fortran Warning Var(warn_target_lifetime) LangEnabledBy(Fortran,Wall)
 302 Warn if the pointer in a pointer assignment might outlive its target.
 303
 304 Wreturn-type
 305 Fortran Warning LangEnabledBy(Fortran,Wall)
 306 ; Documented in C
 307
 308 Wsurprising
 309 Fortran Warning Var(warn_surprising) LangEnabledBy(Fortran,Wall)
 310 Warn about \"suspicious\" constructs.
 311
 312 Wtabs
 313 Fortran Warning Var(warn_tabs) LangEnabledBy(Fortran,Wall || Wpedantic)
 314 Permit nonconforming uses of the tab character.
 315
 316 Wundefined-do-loop
 317 Fortran Warning Var(warn_undefined_do_loop) LangEnabledBy(Fortran,Wall)
 318 Warn about an invalid DO loop.
 319
 320 Wunderflow
 321 Fortran Warning Var(warn_underflow) Init(1)
 322 Warn about underflow of numerical constant expressions.
 323
 324 Wuninitialized
 325 Fortran LangEnabledBy(Fortran,Wall)
 326 ; Documented in common.opt
 327
 328 Wintrinsic-shadow
 329 Fortran Warning Var(warn_intrinsic_shadow) LangEnabledBy(Fortran,Wall)
 330 Warn if a user-procedure has the same name as an intrinsic.
 331
 332 Wunused
 333 LangEnabledBy(Fortran,Wall)
 334 ; Documented in common.opt
 335
 336 Wunused-dummy-argument
 337 Fortran Warning Var(warn_unused_dummy_argument) LangEnabledBy(Fortran,Wall)
 338 Warn about unused dummy arguments.
 339
 340 Wzerotrip
 341 Fortran Warning Var(warn_zerotrip) LangEnabledBy(Fortran,Wall)
 342 Warn about zero-trip DO loops.
 343
 344 cpp
 345 Fortran Negative(nocpp)
 346 Enable preprocessing.
 347
 348 cpp=
 349 Fortran Joined Negative(nocpp) Undocumented NoDWARFRecord
 350 ; Internal option generated by specs from -cpp.
 351
 352 nocpp
 353 Fortran Negative(cpp)
 354 Disable preprocessing.
 355
 356 d
 357 Fortran Joined
 358 ; Documented in common.opt
 359
 360 faggressive-function-elimination
 361 Fortran Var(flag_aggressive_function_elimination)
 362 Eliminate multiple function invocations also for impure functions.
 363
 364 falign-commons
 365 Fortran Var(flag_align_commons) Init(1)
 366 Enable alignment of COMMON blocks.
 367
 368 fall-intrinsics
 369 Fortran RejectNegative Var(flag_all_intrinsics)
 370 All intrinsics procedures are available regardless of selected standard.
 371
 372 fallow-leading-underscore
 373 Fortran Undocumented Var(flag_allow_leading_underscore)
 374 ; For internal use only: allow the first character of symbol names to be an underscore
 375
 376 fautomatic
 377 Fortran Var(flag_automatic) Init(1)
 378 Do not treat local variables and COMMON blocks as if they were named in SAVE statements.
 379
 380 fbackslash
 381 Fortran Var(flag_backslash)
 382 Specify that backslash in string introduces an escape character.
 383
 384 fbacktrace
 385 Fortran Var(flag_backtrace) Init(1)
 386 Produce a backtrace when a runtime error is encountered.
 387
 388 fblas-matmul-limit=
 389 Fortran RejectNegative Joined UInteger Var(flag_blas_matmul_limit) Init(30)
 390 -fblas-matmul-limit=<n> Size of the smallest matrix for which matmul will use BLAS.
 391
 392 fcheck-array-temporaries
 393 Fortran
 394 Produce a warning at runtime if a array temporary has been created for a procedure argument.
 395
 396 fconvert=
 397 Fortran RejectNegative Joined Enum(gfc_convert) Var(flag_convert) Init(GFC_FLAG_CONVERT_NATIVE)
 398 -fconvert=<big-endian|little-endian|native|swap> The endianness used for unformatted files.
 399
 400 Enum
 401 Name(gfc_convert) Type(enum gfc_convert) UnknownError(Unrecognized option to endianness value: %qs)
 402
 403 EnumValue
 404 Enum(gfc_convert) String(big-endian) Value(GFC_FLAG_CONVERT_BIG)
 405
 406 EnumValue
 407 Enum(gfc_convert) String(little-endian) Value(GFC_FLAG_CONVERT_LITTLE)
 408
 409 EnumValue
 410 Enum(gfc_convert) String(native) Value(GFC_FLAG_CONVERT_NATIVE)
 411
 412 EnumValue
 413 Enum(gfc_convert) String(swap) Value(GFC_FLAG_CONVERT_SWAP)
 414
 415 fcray-pointer
 416 Fortran Var(flag_cray_pointer)
 417 Use the Cray Pointer extension.
 418
 419 fc-prototypes
 420 Fortran Var(flag_c_prototypes)
 421 Generate C prototypes from BIND(C) declarations.
 422
 423 fd-lines-as-code
 424 Fortran RejectNegative
 425 Ignore 'D' in column one in fixed form.
 426
 427 fd-lines-as-comments
 428 Fortran RejectNegative
 429 Treat lines with 'D' in column one as comments.
 430
 431 fdec
 432 Fortran Var(flag_dec)
 433 Enable all DEC language extensions.
 434
 435 fdec-intrinsic-ints
 436 Fortran Var(flag_dec_intrinsic_ints)
 437 Enable kind-specific variants of integer intrinsic functions.
 438
 439 fdec-math
 440 Fortran Var(flag_dec_math)
 441 Enable legacy math intrinsics for compatibility.
 442
 443 fdec-structure
 444 Fortran Var(flag_dec_structure)
 445 Enable support for DEC STRUCTURE/RECORD.
 446
 447 fdec-static
 448 Fortran Var(flag_dec_static)
 449 Enable DEC-style STATIC and AUTOMATIC attributes.
 450
 451 fdefault-double-8
 452 Fortran Var(flag_default_double)
 453 Set the default double precision kind to an 8 byte wide type.
 454
 455 fdefault-integer-8
 456 Fortran Var(flag_default_integer)
 457 Set the default integer kind to an 8 byte wide type.
 458
 459 fdefault-real-8
 460 Fortran Var(flag_default_real)
 461 Set the default real kind to an 8 byte wide type.
 462
 463 fdollar-ok
 464 Fortran Var(flag_dollar_ok)
 465 Allow dollar signs in entity names.
 466
 467 fdump-core
 468 Fortran Ignore
 469 Does nothing. Preserved for backward compatibility.
 470
 471 fdump-fortran-original
 472 Fortran Var(flag_dump_fortran_original)
 473 Display the code tree after parsing.
 474
 475 fdump-fortran-optimized
 476 Fortran Var(flag_dump_fortran_optimized)
 477 Display the code tree after front end optimization.
 478
 479 fdump-parse-tree
 480 Fortran Alias(fdump-fortran-original)
 481 Display the code tree after parsing; deprecated option.
 482
 483 fexternal-blas
 484 Fortran Var(flag_external_blas)
 485 Specify that an external BLAS library should be used for matmul calls on large-size arrays.
 486
 487 ff2c
 488 Fortran Var(flag_f2c)
 489 Use f2c calling convention.
 490
 491 ffixed-form
 492 Fortran RejectNegative
 493 Assume that the source file is fixed form.
 494
 495 ftest-forall-temp
 496 Fortran Var(flag_test_forall_temp) Init(0)
 497 Force creation of temporary to test infrequently-executed forall code.
 498
 499 finteger-4-integer-8
 500 Fortran RejectNegative Var(flag_integer4_kind,8)
 501 Interpret any INTEGER(4) as an INTEGER(8).
 502
 503 fintrinsic-modules-path
 504 Fortran RejectNegative Separate
 505 Specify where to find the compiled intrinsic modules.
 506
 507 fintrinsic-modules-path=
 508 Fortran RejectNegative Joined
 509 Specify where to find the compiled intrinsic modules.
 510
 511 ffixed-line-length-none
 512 Fortran RejectNegative Var(flag_fixed_line_length,0)
 513 Allow arbitrary character line width in fixed mode.
 514
 515 ffixed-line-length-
 516 Fortran RejectNegative Joined UInteger Var(flag_fixed_line_length) Init(72)
 517 -ffixed-line-length-<n> Use n as character line width in fixed mode.
 518
 519 ffpe-trap=
 520 Fortran RejectNegative JoinedOrMissing
 521 -ffpe-trap=[...]        Stop on following floating point exceptions.
 522
 523 ffpe-summary=
 524 Fortran RejectNegative JoinedOrMissing
 525 -ffpe-summary=[...]     Print summary of floating point exceptions.
 526
 527 ffree-form
 528 Fortran RejectNegative
 529 Assume that the source file is free form.
 530
 531 ffree-line-length-none
 532 Fortran RejectNegative Var(flag_free_line_length,0)
 533 Allow arbitrary character line width in free mode.
 534
 535 ffree-line-length-
 536 Fortran RejectNegative Joined UInteger Var(flag_free_line_length) Init(132)
 537 -ffree-line-length-<n>  Use n as character line width in free mode.
 538
 539 ffrontend-optimize
 540 Fortran Var(flag_frontend_optimize) Init(-1)
 541 Enable front end optimization.
 542
 543 fimplicit-none
 544 Fortran Var(flag_implicit_none)
 545 Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements.
 546
 547 finit-character=
 548 Fortran RejectNegative Joined UInteger
 549 -finit-character=<n>    Initialize local character variables to ASCII value n.
 550
 551 finit-derived
 552 Fortran Var(flag_init_derived)
 553 Initialize components of derived type variables according to other init flags.
 554
 555 finit-integer=
 556 Fortran RejectNegative Joined
 557 -finit-integer=<n>      Initialize local integer variables to n.
 558
 559 finit-local-zero
 560 Fortran
 561 Initialize local variables to zero (from g77).
 562
 563 finit-logical=
 564 Fortran RejectNegative Joined
 565 -finit-logical=<true|false>     Initialize local logical variables.
 566
 567 finit-real=
 568 Fortran RejectNegative ToLower Joined Enum(gfc_init_local_real) Var(flag_init_real) Init(GFC_INIT_REAL_OFF)
 569 -finit-real=<zero|snan|nan|inf|-inf>    Initialize local real variables.
 570
 571 Enum
 572 Name(gfc_init_local_real) Type(enum gfc_init_local_real) UnknownError(Unrecognized option to floating-point init value: %qs)
 573
 574 EnumValue
 575 Enum(gfc_init_local_real) String(zero) Value(GFC_INIT_REAL_ZERO)
 576
 577 EnumValue
 578 Enum(gfc_init_local_real) String(snan) Value(GFC_INIT_REAL_SNAN)
 579
 580 EnumValue
 581 Enum(gfc_init_local_real) String(nan) Value(GFC_INIT_REAL_NAN)
 582
 583 EnumValue
 584 Enum(gfc_init_local_real) String(inf) Value(GFC_INIT_REAL_INF)
 585
 586 EnumValue
 587 Enum(gfc_init_local_real) String(-inf) Value(GFC_INIT_REAL_NEG_INF)
 588
 589 finline-matmul-limit=
 590 Fortran RejectNegative Joined UInteger Var(flag_inline_matmul_limit) Init(-1)
 591 -finline-matmul-limit=<n>       Specify the size of the largest matrix for which matmul will be inlined.
 592
 593 fmax-array-constructor=
 594 Fortran RejectNegative Joined UInteger Var(flag_max_array_constructor) Init(65535)
 595 -fmax-array-constructor=<n>     Maximum number of objects in an array constructor.
 596
 597 fmax-identifier-length=
 598 Fortran RejectNegative Joined UInteger
 599 -fmax-identifier-length=<n>     Maximum identifier length.
 600
 601 fmax-subrecord-length=
 602 Fortran RejectNegative Joined UInteger Var(flag_max_subrecord_length)
 603 -fmax-subrecord-length=<n>      Maximum length for subrecords.
 604
 605 fmax-stack-var-size=
 606 Fortran RejectNegative Joined UInteger Var(flag_max_stack_var_size) Init(-2)
 607 -fmax-stack-var-size=<n>        Size in bytes of the largest array that will be put on the stack.
 608
 609 fstack-arrays
 610 Fortran Var(flag_stack_arrays) Init(-1)
 611 Put all local arrays on stack.
 612
 613 fmodule-private
 614 Fortran Var(flag_module_private)
 615 Set default accessibility of module entities to PRIVATE.
 616
 617 fopenacc
 618 Fortran LTO
 619 ; Documented in C
 620
 621 fopenacc-dim=
 622 Fortran LTO Joined Var(flag_openacc_dims)
 623 ; Documented in C
 624
 625 fopenmp
 626 Fortran LTO
 627 ; Documented in C
 628
 629 fopenmp-simd
 630 Fortran
 631 ; Documented in C
 632
 633 fpack-derived
 634 Fortran Var(flag_pack_derived)
 635 Try to lay out derived types as compactly as possible.
 636
 637 fpreprocessed
 638 Fortran
 639 ; Documented in C
 640
 641 fprotect-parens
 642 Fortran Var(flag_protect_parens) Init(-1)
 643 Protect parentheses in expressions.
 644
 645 frange-check
 646 Fortran Var(flag_range_check) Init(1)
 647 Enable range checking during compilation.
 648
 649 freal-4-real-8
 650 Fortran RejectNegative Var(flag_real4_kind,8)
 651 Interpret any REAL(4) as a REAL(8).
 652
 653 freal-4-real-10
 654 Fortran RejectNegative Var(flag_real4_kind,10)
 655 Interpret any REAL(4) as a REAL(10).
 656
 657 freal-4-real-16
 658 Fortran RejectNegative Var(flag_real4_kind,16)
 659 Interpret any REAL(4) as a REAL(16).
 660
 661 freal-8-real-4
 662 Fortran RejectNegative Var(flag_real8_kind,4)
 663 Interpret any REAL(8) as a REAL(4).
 664
 665 freal-8-real-10
 666 Fortran RejectNegative Var(flag_real8_kind,10)
 667 Interpret any REAL(8) as a REAL(10).
 668
 669 freal-8-real-16
 670 Fortran RejectNegative Var(flag_real8_kind,16)
 671 Interpret any REAL(8) as a REAL(16).
 672
 673 frealloc-lhs
 674 Fortran Var(flag_realloc_lhs) Init(-1)
 675 Reallocate the LHS in assignments.
 676
 677 frecord-marker=4
 678 Fortran RejectNegative Var(flag_record_marker,4)
 679 Use a 4-byte record marker for unformatted files.
 680
 681 frecord-marker=8
 682 Fortran RejectNegative Var(flag_record_marker,8)
 683 Use an 8-byte record marker for unformatted files.
 684
 685 frecursive
 686 Fortran Var(flag_recursive)
 687 Allocate local variables on the stack to allow indirect recursion.
 688
 689 frepack-arrays
 690 Fortran Var(flag_repack_arrays)
 691 Copy array sections into a contiguous block on procedure entry.
 692
 693 fcoarray=
 694 Fortran RejectNegative Joined Enum(gfc_fcoarray) Var(flag_coarray) Init(GFC_FCOARRAY_NONE)
 695 -fcoarray=<none|single|lib>     Specify which coarray parallelization should be used.
 696
 697 Enum
 698 Name(gfc_fcoarray) Type(enum gfc_fcoarray) UnknownError(Unrecognized option: %qs)
 699
 700 EnumValue
 701 Enum(gfc_fcoarray) String(none) Value(GFC_FCOARRAY_NONE)
 702
 703 EnumValue
 704 Enum(gfc_fcoarray) String(single) Value(GFC_FCOARRAY_SINGLE)
 705
 706 EnumValue
 707 Enum(gfc_fcoarray) String(lib) Value(GFC_FCOARRAY_LIB)
 708
 709 fcheck=
 710 Fortran RejectNegative JoinedOrMissing
 711 -fcheck=[...]   Specify which runtime checks are to be performed.
 712
 713 fsecond-underscore
 714 Fortran Var(flag_second_underscore) Init(-1)
 715 Append a second underscore if the name already contains an underscore.
 716
 717 fshort-enums
 718 Fortran Var(flag_short_enums)
 719 ; Documented in C
 720
 721 fsign-zero
 722 Fortran Var(flag_sign_zero) Init(1)
 723 Apply negative sign to zero values.
 724
 725 funderscoring
 726 Fortran Var(flag_underscoring) Init(1)
 727 Append underscores to externally visible names.
 728
 729 fwhole-file
 730 Fortran Ignore
 731 Does nothing.  Preserved for backward compatibility.
 732
 733 fworking-directory
 734 Fortran
 735 ; Documented in C
 736
 737 idirafter
 738 Fortran Joined Separate
 739 ; Documented in C
 740
 741 imultilib
 742 Fortran Joined Separate
 743 ; Documented in C
 744
 745 iprefix
 746 Fortran Joined Separate
 747 ; Documented in C
 748
 749 iquote
 750 Fortran Joined Separate
 751 ; Documented in C
 752
 753 isysroot
 754 Fortran Joined Separate
 755 ; Documented in C
 756
 757 isystem
 758 Fortran Joined Separate
 759 ; Documented in C
 760
 761 nostdinc
 762 Fortran
 763 ; Documented in C
 764
 765 o
 766 Fortran Joined Separate
 767 ; Documented in common.opt
 768
 769 static-libgfortran
 770 Fortran
 771 Statically link the GNU Fortran helper library (libgfortran).
 772
 773 std=f2003
 774 Fortran
 775 Conform to the ISO Fortran 2003 standard.
 776
 777 std=f2008
 778 Fortran
 779 Conform to the ISO Fortran 2008 standard.
 780
 781 std=f2008ts
 782 Fortran
 783 Conform to the ISO Fortran 2008 standard including TS 29113.
 784
 785 std=f95
 786 Fortran
 787 Conform to the ISO Fortran 95 standard.
 788
 789 std=gnu
 790 Fortran
 791 Conform to nothing in particular.
 792
 793 std=legacy
 794 Fortran
 795 Accept extensions to support legacy code.
 796
 797 undef
 798 Fortran
 799 ; Documented in C
 800
 801 v
 802 Fortran
 803 ; Documented in C
 804
 805 ; This comment is to ensure we retain the blank line above.