aboutsummaryrefslogtreecommitdiff
path: root/gcc/fortran/lang.opt
blob: cf397129d55b528495c68d23d3b003b5b18167b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
; Options for the Fortran front end.
; Copyright (C) 2003-2022 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
; GCC is free software; you can redistribute it and/or modify it under
; the terms of the GNU General Public License as published by the Free
; Software Foundation; either version 3, or (at your option) any later
; version.
; 
; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
; WARRANTY; without even the implied warranty of MERCHANTABILITY or
; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
; for more details.
; 
; You should have received a copy of the GNU General Public License
; along with GCC; see the file COPYING3.  If not see
; <http://www.gnu.org/licenses/>.

; See the GCC internals manual for a description of this file's format.

; Please try to keep this file in ASCII collating order.

Language
Fortran

-all-warnings
Fortran Alias(Wall)

-assert
Fortran Separate Alias(A)

-assert=
Fortran Joined Alias(A)

-comments
Fortran Alias(C)

-comments-in-macros
Fortran Alias(CC)

-define-macro
Fortran Separate Alias(D)

-define-macro=
Fortran Joined Alias(D)

-dependencies
Fortran Alias(M)

-dump
Fortran Separate Alias(d)

-dump=
Fortran Joined Alias(d)

-include-barrier
Fortran Alias(I, -)

-include-directory
Fortran Separate Alias(I)

-include-directory=
Fortran Joined Alias(I)

-include-directory-after
Fortran Separate Alias(idirafter)

-include-directory-after=
Fortran Joined Alias(idirafter)

-include-prefix
Fortran Separate Alias(iprefix)

-include-prefix=
Fortran JoinedOrMissing Alias(iprefix)

-no-line-commands
Fortran Alias(P)

-no-standard-includes
Fortran Alias(nostdinc)

-output
Fortran Separate Alias(o)

-output=
Fortran Joined Alias(o)

-preprocess
Fortran Undocumented Alias(E)

-print-missing-file-dependencies
Fortran Alias(MG)

-trace-includes
Fortran Alias(H)

-undefine-macro
Fortran Separate Alias(U)

-undefine-macro=
Fortran Joined Alias(U)

-user-dependencies
Fortran Alias(MM)

-verbose
Fortran Alias(v)

-write-dependencies
Fortran NoDriverArg Separate Alias(MD)

-write-user-dependencies
Fortran NoDriverArg Separate Alias(MMD)

A
Fortran Joined Separate
; Documented in C

C
Fortran
; Documented in C

CC
Fortran
; Documented in C

D
Fortran Joined Separate
; Documented in C

E
Fortran Undocumented

H
Fortran
; Documented in C

I
Fortran Joined Separate
; Documented in C

J
Fortran Joined Separate
-J<directory>	Put MODULE files in 'directory'.

M
Fortran
; Documented in C

MD
Fortran Separate NoDriverArg
; Documented in C

MF
Fortran Joined Separate
; Documented in C

MG
Fortran
; Documented in C

MM
Fortran
; Documented in C

MMD
Fortran Separate NoDriverArg
; Documented in C

MP
Fortran
; Documented in C

MT
Fortran Joined Separate
; Documented in C

MQ
Fortran Joined Separate
; Documented in C

P
Fortran
; Documented in C

U
Fortran Joined Separate
; Documented in C

Wall
Fortran
; Documented in C

Waliasing
Fortran Warning Var(warn_aliasing) LangEnabledBy(Fortran,Wall)
Warn about possible aliasing of dummy arguments.

Walign-commons
Fortran Warning Var(warn_align_commons) Init(1)
Warn about alignment of COMMON blocks.

Wampersand
Fortran Warning Var(warn_ampersand) LangEnabledBy(Fortran,Wall || Wpedantic)
Warn about missing ampersand in continued character constants.

Warray-temporaries
Fortran Warning Var(warn_array_temporaries)
Warn about creation of array temporaries.

Wargument-mismatch
Fortran WarnRemoved
Does nothing. Preserved for backward compatibility.

Wc-binding-type
Fortran Var(warn_c_binding_type) Warning LangEnabledBy(Fortran,Wall)
Warn if the type of a variable might be not interoperable with C.

Wdate-time
Fortran
; Documented in C

Wcharacter-truncation
Fortran Var(warn_character_truncation) Warning LangEnabledBy(Fortran,Wall)
Warn about truncated character expressions.

Wcompare-reals
Fortran Warning Var(warn_compare_reals) LangEnabledBy(Fortran,Wextra)
Warn about equality comparisons involving REAL or COMPLEX expressions.

Wconversion
Fortran Var(warn_conversion) Warning LangEnabledBy(Fortran,Wall)
; Documented in C

Wconversion-extra
Fortran Var(warn_conversion_extra) Warning
Warn about most implicit conversions.

Wdo-subscript
Fortran Var(warn_do_subscript) Warning LangEnabledBy(Fortran,Wextra)
Warn about possibly incorrect subscripts in do loops.

Wextra
Fortran Warning
; Documented in common

Wfrontend-loop-interchange
Fortran Var(flag_warn_frontend_loop_interchange)
Warn if loops have been interchanged.

Wfunction-elimination
Fortran Warning Var(warn_function_elimination) LangEnabledBy(Fortran,Wextra)
Warn about function call elimination.

Wimplicit-interface
Fortran Warning Var(warn_implicit_interface)
Warn about calls with implicit interface.

Wimplicit-procedure
Fortran Warning Var(warn_implicit_procedure)
Warn about called procedures not explicitly declared.

Winteger-division
Fortran Warning Var(warn_integer_division) LangEnabledBy(Fortran,Wall)
Warn about constant integer divisions with truncated results.

Wline-truncation
Fortran Warning Var(warn_line_truncation) LangEnabledBy(Fortran,Wall) Init(-1)
Warn about truncated source lines.

Wintrinsics-std
Fortran Var(warn_intrinsics_std) Warning LangEnabledBy(Fortran,Wall)
Warn on intrinsics not part of the selected standard.

Wmaybe-uninitialized
Fortran LangEnabledBy(Fortran,Wall)
; Documented in common.opt

Wmissing-include-dirs
Fortran
; Documented in C/C++

Wuse-without-only
Fortran Var(warn_use_without_only) Warning
Warn about USE statements that have no ONLY qualifier.

Wopenacc-parallelism
Fortran
; Documented in C

Wopenmp-simd
Fortran
; Documented in C

Woverwrite-recursive
Fortran Warning Var(warn_overwrite_recursive) Init(1)
Warn that -fno-automatic may break recursion.

Wpedantic
Fortran
; Documented in common.opt

Wreal-q-constant
Fortran Warning Var(warn_real_q_constant) LangEnabledBy(Fortran,Wall)
Warn about real-literal-constants with 'q' exponent-letter.

Wrealloc-lhs
Fortran Warning Var(warn_realloc_lhs) LangEnabledBy(Fortran,Wrealloc-lhs-all)
Warn when a left-hand-side array variable is reallocated.

Wrealloc-lhs-all
Fortran Warning Var(warn_realloc_lhs_all)
Warn when a left-hand-side variable is reallocated.

Wtarget-lifetime
Fortran Warning Var(warn_target_lifetime) LangEnabledBy(Fortran,Wall)
Warn if the pointer in a pointer assignment might outlive its target.

Wreturn-type
Fortran Warning LangEnabledBy(Fortran,Wall)
; Documented in C

Wsurprising
Fortran Warning Var(warn_surprising) LangEnabledBy(Fortran,Wall)
Warn about \"suspicious\" constructs.

Wtabs
Fortran Warning Var(warn_tabs) LangEnabledBy(Fortran,Wall || Wpedantic)
Permit nonconforming uses of the tab character.

Wundefined-do-loop
Fortran Warning Var(warn_undefined_do_loop) LangEnabledBy(Fortran,Wall)
Warn about an invalid DO loop.

Wunderflow
Fortran Warning Var(warn_underflow) Init(1)
Warn about underflow of numerical constant expressions.

Wuninitialized
Fortran LangEnabledBy(Fortran,Wall)
; Documented in common.opt

Wintrinsic-shadow
Fortran Warning Var(warn_intrinsic_shadow) LangEnabledBy(Fortran,Wall)
Warn if a user-procedure has the same name as an intrinsic.

Wunused
LangEnabledBy(Fortran,Wall)
; Documented in common.opt

Wunused-dummy-argument
Fortran Warning Var(warn_unused_dummy_argument) LangEnabledBy(Fortran,Wall)
Warn about unused dummy arguments.

Wzerotrip
Fortran Warning Var(warn_zerotrip) LangEnabledBy(Fortran,Wall)
Warn about zero-trip DO loops.

cpp
Fortran Negative(nocpp)
Enable preprocessing.

cpp=
Fortran Joined Negative(nocpp) Undocumented NoDWARFRecord
; Internal option generated by specs from -cpp.

nocpp
Fortran Negative(cpp)
Disable preprocessing.

d
Fortran Joined
; Documented in common.opt

fallow-argument-mismatch
Fortran Var(flag_allow_argument_mismatch) LangEnabledBy(Fortran,std=legacy)
Accept argument mismatches in procedure calls.

faggressive-function-elimination
Fortran Var(flag_aggressive_function_elimination)
Eliminate multiple function invocations also for impure functions.

falign-commons
Fortran Var(flag_align_commons) Init(1)
Enable alignment of COMMON blocks.

fall-intrinsics
Fortran RejectNegative Var(flag_all_intrinsics)
All intrinsics procedures are available regardless of selected standard.

fallow-invalid-boz
Fortran RejectNegative Var(flag_allow_invalid_boz)
Allow a BOZ literal constant to appear in an invalid context and with X instead of Z.

fallow-leading-underscore
Fortran Undocumented Var(flag_allow_leading_underscore)
; For internal use only: allow the first character of symbol names to be an underscore

fautomatic
Fortran Var(flag_automatic) Init(1)
Do not treat local variables and COMMON blocks as if they were named in SAVE statements.

fbackslash
Fortran Var(flag_backslash)
Specify that backslash in string introduces an escape character.

fbacktrace
Fortran Var(flag_backtrace) Init(1)
Produce a backtrace when a runtime error is encountered.

fblas-matmul-limit=
Fortran RejectNegative Joined UInteger Var(flag_blas_matmul_limit) Init(30)
-fblas-matmul-limit=<n>	Size of the smallest matrix for which matmul will use BLAS.

fbuilding-libgfortran
Fortran Undocumented Var(flag_building_libgfortran)

fcheck-array-temporaries
Fortran
Produce a warning at runtime if a array temporary has been created for a procedure argument.

fconvert=
Fortran RejectNegative Joined Enum(gfc_convert) EnumSet Var(flag_convert) Init(GFC_FLAG_CONVERT_NATIVE)
-fconvert=<big-endian|little-endian|native|swap|r16_ieee|r16_ibm>	The endianness used for unformatted files.

Enum
Name(gfc_convert) Type(enum gfc_convert) UnknownError(Unrecognized option to endianness value: %qs)

EnumValue
Enum(gfc_convert) String(big-endian) Value(GFC_FLAG_CONVERT_BIG) Set(1)

EnumValue
Enum(gfc_convert) String(little-endian) Value(GFC_FLAG_CONVERT_LITTLE) Set(1)

EnumValue
Enum(gfc_convert) String(native) Value(GFC_FLAG_CONVERT_NATIVE) Set(1)

EnumValue
Enum(gfc_convert) String(swap) Value(GFC_FLAG_CONVERT_SWAP) Set(1)

EnumValue
Enum(gfc_convert) String(r16_ieee) Value(GFC_FLAG_CONVERT_R16_IEEE) Set(2)

EnumValue
Enum(gfc_convert) String(r16_ibm) Value(GFC_FLAG_CONVERT_R16_IBM) Set(2)

fcray-pointer
Fortran Var(flag_cray_pointer)
Use the Cray Pointer extension.

fc-prototypes
Fortran Var(flag_c_prototypes)
Generate C prototypes from BIND(C) declarations.

fc-prototypes-external
Fortran Var(flag_c_prototypes_external)
Generate C prototypes from non-BIND(C) external procedure definitions.

fd-lines-as-code
Fortran RejectNegative
Ignore 'D' in column one in fixed form.

fd-lines-as-comments
Fortran RejectNegative
Treat lines with 'D' in column one as comments.

fdebug-aux-vars
Fortran Var(flag_debug_aux_vars)
Issue debug information for compiler-generated auxiliary variables.

fdec
Fortran Var(flag_dec)
Enable all DEC language extensions.

fdec-blank-format-item
Fortran Var(flag_dec_blank_format_item)
Enable the use of blank format items in format strings.

fdec-char-conversions
Fortran Var(flag_dec_char_conversions)
Enable the use of character literals in assignments and data statements
for non-character variables.

fdec-include
Fortran Var(flag_dec_include)
Enable legacy parsing of INCLUDE as statement.

fdec-format-defaults
Fortran Var(flag_dec_format_defaults)
Enable default widths for i, f and g format specifiers.

fdec-intrinsic-ints
Fortran Var(flag_dec_intrinsic_ints)
Enable kind-specific variants of integer intrinsic functions.

fdec-math
Fortran Var(flag_dec_math)
Enable legacy math intrinsics for compatibility.

fdec-structure
Fortran Var(flag_dec_structure)
Enable support for DEC STRUCTURE/RECORD.

fdec-static
Fortran Var(flag_dec_static)
Enable DEC-style STATIC and AUTOMATIC attributes.

fdefault-double-8
Fortran Var(flag_default_double)
Set the default double precision kind to an 8 byte wide type.

fdefault-integer-8
Fortran Var(flag_default_integer)
Set the default integer kind to an 8 byte wide type.

fdefault-real-8
Fortran Var(flag_default_real_8)
Set the default real kind to an 8 byte wide type.

fdefault-real-10
Fortran Var(flag_default_real_10)
Set the default real kind to an 10 byte wide type.

fdefault-real-16
Fortran Var(flag_default_real_16)
Set the default real kind to an 16 byte wide type.

fdollar-ok
Fortran Var(flag_dollar_ok)
Allow dollar signs in entity names.

fdump-core
Fortran Ignore
Does nothing. Preserved for backward compatibility.

fdump-fortran-original
Fortran Var(flag_dump_fortran_original)
Display the code tree after parsing.

fdump-fortran-optimized
Fortran Var(flag_dump_fortran_optimized)
Display the code tree after front end optimization.

fdump-fortran-global
Fortran Var(flag_dump_fortran_global)
Display the global symbol table after parsing.

fdump-parse-tree
Fortran Alias(fdump-fortran-original)
Display the code tree after parsing; deprecated option.

fexternal-blas
Fortran Var(flag_external_blas)
Specify that an external BLAS library should be used for matmul calls on large-size arrays.

ff2c
Fortran Var(flag_f2c)
Use f2c calling convention.

ffixed-form
Fortran RejectNegative
Assume that the source file is fixed form.

ftest-forall-temp
Fortran Var(flag_test_forall_temp) Init(0)
Force creation of temporary to test infrequently-executed forall code.

finteger-4-integer-8
Fortran RejectNegative Var(flag_integer4_kind,8)
Interpret any INTEGER(4) as an INTEGER(8).

fintrinsic-modules-path
Fortran RejectNegative Separate
Specify where to find the compiled intrinsic modules.

fintrinsic-modules-path=
Fortran RejectNegative Joined
Specify where to find the compiled intrinsic modules.

ffixed-line-length-none
Fortran RejectNegative Var(flag_fixed_line_length,0)
Allow arbitrary character line width in fixed mode.

ffixed-line-length-
Fortran RejectNegative Joined UInteger Var(flag_fixed_line_length) Init(72)
-ffixed-line-length-<n>	Use n as character line width in fixed mode.

fpad-source
Fortran Var(flag_pad_source) Init(1)
Pad shorter fixed form lines to line width with spaces.

ffpe-trap=
Fortran RejectNegative JoinedOrMissing
-ffpe-trap=[...]	Stop on following floating point exceptions.

ffpe-summary=
Fortran RejectNegative JoinedOrMissing
-ffpe-summary=[...]	Print summary of floating point exceptions.

ffree-form
Fortran RejectNegative
Assume that the source file is free form.

ffree-line-length-none
Fortran RejectNegative Var(flag_free_line_length,0)
Allow arbitrary character line width in free mode.

ffree-line-length-
Fortran RejectNegative Joined UInteger Var(flag_free_line_length) Init(132)
-ffree-line-length-<n>	Use n as character line width in free mode.

ffrontend-loop-interchange
Fortran Var(flag_frontend_loop_interchange) Init(-1)
Try to interchange loops if profitable.

ffrontend-optimize
Fortran Var(flag_frontend_optimize) Init(-1)
Enable front end optimization.

fimplicit-none
Fortran Var(flag_implicit_none)
Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements.

finit-character=
Fortran RejectNegative Joined UInteger
-finit-character=<n>	Initialize local character variables to ASCII value n.

finit-derived
Fortran Var(flag_init_derived)
Initialize components of derived type variables according to other init flags.

finit-integer=
Fortran RejectNegative Joined
-finit-integer=<n>	Initialize local integer variables to n.

finit-local-zero
Fortran
Initialize local variables to zero (from g77).

finit-logical=
Fortran RejectNegative Joined
-finit-logical=<true|false>	Initialize local logical variables.

finit-real=
Fortran RejectNegative ToLower Joined Enum(gfc_init_local_real) Var(flag_init_real) Init(GFC_INIT_REAL_OFF)
-finit-real=<zero|snan|nan|inf|-inf>	Initialize local real variables.

Enum
Name(gfc_init_local_real) Type(enum gfc_init_local_real) UnknownError(Unrecognized option to floating-point init value: %qs)

EnumValue
Enum(gfc_init_local_real) String(zero) Value(GFC_INIT_REAL_ZERO)

EnumValue
Enum(gfc_init_local_real) String(snan) Value(GFC_INIT_REAL_SNAN)

EnumValue
Enum(gfc_init_local_real) String(nan) Value(GFC_INIT_REAL_NAN)

EnumValue
Enum(gfc_init_local_real) String(inf) Value(GFC_INIT_REAL_INF)

EnumValue
Enum(gfc_init_local_real) String(-inf) Value(GFC_INIT_REAL_NEG_INF)

finline-arg-packing
Fortran  Var(flag_inline_arg_packing) Init(-1)
-finline-arg-packing	Perform argument packing inline.

finline-matmul-limit=
Fortran RejectNegative Joined UInteger Var(flag_inline_matmul_limit) Init(-1)
-finline-matmul-limit=<n>	Specify the size of the largest matrix for which matmul will be inlined.

fmax-array-constructor=
Fortran RejectNegative Joined UInteger Var(flag_max_array_constructor) Init(65535)
-fmax-array-constructor=<n>	Maximum number of objects in an array constructor.

fmax-identifier-length=
Fortran RejectNegative Joined UInteger
-fmax-identifier-length=<n>	Maximum identifier length.

fmax-subrecord-length=
Fortran RejectNegative Joined UInteger Var(flag_max_subrecord_length)
-fmax-subrecord-length=<n>	Maximum length for subrecords.

fmax-stack-var-size=
Fortran RejectNegative Joined UInteger Var(flag_max_stack_var_size) Init(-2)
-fmax-stack-var-size=<n>	Size in bytes of the largest array that will be put on the stack.

fstack-arrays
Fortran Var(flag_stack_arrays) Init(-1)
Put all local arrays on stack.

fmodule-private
Fortran Var(flag_module_private)
Set default accessibility of module entities to PRIVATE.

fopenacc
Fortran LTO
; Documented in C

fopenacc-dim=
Fortran LTO Joined Var(flag_openacc_dims)
; Documented in C

fopenmp
Fortran LTO
; Documented in C

fopenmp-simd
Fortran
; Documented in C

fpack-derived
Fortran Var(flag_pack_derived)
Try to lay out derived types as compactly as possible.

fpreprocessed
Fortran
; Documented in C

fprotect-parens
Fortran Var(flag_protect_parens) Init(-1)
Protect parentheses in expressions.

fpre-include=
Fortran RejectNegative Joined Var(flag_pre_include) Undocumented
Path to header file that should be pre-included before each compilation unit.

frange-check
Fortran Var(flag_range_check) Init(1)
Enable range checking during compilation.

freal-4-real-8
Fortran RejectNegative Var(flag_real4_kind,8)
Interpret any REAL(4) as a REAL(8).

freal-4-real-10
Fortran RejectNegative Var(flag_real4_kind,10)
Interpret any REAL(4) as a REAL(10).

freal-4-real-16
Fortran RejectNegative Var(flag_real4_kind,16)
Interpret any REAL(4) as a REAL(16).

freal-8-real-4
Fortran RejectNegative Var(flag_real8_kind,4)
Interpret any REAL(8) as a REAL(4).

freal-8-real-10
Fortran RejectNegative Var(flag_real8_kind,10)
Interpret any REAL(8) as a REAL(10).

freal-8-real-16
Fortran RejectNegative Var(flag_real8_kind,16)
Interpret any REAL(8) as a REAL(16).

frealloc-lhs
Fortran Var(flag_realloc_lhs) Init(-1)
Reallocate the LHS in assignments.

frecord-marker=4
Fortran RejectNegative Var(flag_record_marker,4)
Use a 4-byte record marker for unformatted files.

frecord-marker=8
Fortran RejectNegative Var(flag_record_marker,8)
Use an 8-byte record marker for unformatted files.

frecursive
Fortran Var(flag_recursive)
Allocate local variables on the stack to allow indirect recursion.

frepack-arrays
Fortran Var(flag_repack_arrays)
Copy array sections into a contiguous block on procedure entry.

fcoarray=
Fortran RejectNegative Joined Enum(gfc_fcoarray) Var(flag_coarray) Init(GFC_FCOARRAY_NONE)
-fcoarray=<none|single|lib>	Specify which coarray parallelization should be used.

Enum
Name(gfc_fcoarray) Type(enum gfc_fcoarray) UnknownError(Unrecognized option: %qs)

EnumValue
Enum(gfc_fcoarray) String(none) Value(GFC_FCOARRAY_NONE)

EnumValue
Enum(gfc_fcoarray) String(single) Value(GFC_FCOARRAY_SINGLE)

EnumValue
Enum(gfc_fcoarray) String(lib) Value(GFC_FCOARRAY_LIB)

fcheck=
Fortran RejectNegative JoinedOrMissing
-fcheck=[...]	Specify which runtime checks are to be performed.

fsecond-underscore
Fortran Var(flag_second_underscore) Init(-1)
Append a second underscore if the name already contains an underscore.

fshort-enums
Fortran Var(flag_short_enums)
; Documented in C

fsign-zero
Fortran Var(flag_sign_zero) Init(1)
Apply negative sign to zero values.

ftail-call-workaround
Fortran Alias(ftail-call-workaround=,1,0)

ftail-call-workaround=
Fortran RejectNegative Joined UInteger IntegerRange(0, 2) Var(flag_tail_call_workaround) Init(1)
Disallow tail call optimization when a calling routine may have omitted character lengths.

funderscoring
Fortran Var(flag_underscoring) Init(1)
Append underscores to externally visible names.

fwhole-file
Fortran Ignore
Does nothing.  Preserved for backward compatibility.

fworking-directory
Fortran
; Documented in C

idirafter
Fortran Joined Separate
; Documented in C

imultilib
Fortran Joined Separate
; Documented in C

iprefix
Fortran Joined Separate
; Documented in C

iquote
Fortran Joined Separate
; Documented in C

isysroot
Fortran Joined Separate
; Documented in C

isystem
Fortran Joined Separate
; Documented in C

nostdinc
Fortran
; Documented in C

o
Fortran Joined Separate
; Documented in common.opt

static-libgfortran
Fortran
Statically link the GNU Fortran helper library (libgfortran).

std=f2003
Fortran
Conform to the ISO Fortran 2003 standard.

std=f2008
Fortran
Conform to the ISO Fortran 2008 standard.

std=f2008ts
Fortran
Conform to the ISO Fortran 2008 standard including TS 29113.

std=f2018
Fortran
Conform to the ISO Fortran 2018 standard.

std=f95
Fortran
Conform to the ISO Fortran 95 standard.

std=gnu
Fortran
Conform to nothing in particular.

std=legacy
Fortran
Accept extensions to support legacy code.

undef
Fortran
; Documented in C

v
Fortran
; Documented in C

; This comment is to ensure we retain the blank line above.