mirrored from git://gcc.gnu.org/git/gcc.git
-
Notifications
You must be signed in to change notification settings - Fork 4.3k
/
c.opt
1547 lines (1143 loc) · 43.6 KB
/
c.opt
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
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
; Options for the C, ObjC, C++ and ObjC++ front ends.
; Copyright (C) 2003-2014 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
C
Language
ObjC
Language
C++
Language
ObjC++
-all-warnings
C ObjC C++ ObjC++ Warning Alias(Wall)
-ansi
C ObjC C++ ObjC++ Alias(ansi)
-assert
C ObjC C++ ObjC++ Separate Alias(A) MissingArgError(assertion missing after %qs)
-assert=
C ObjC C++ ObjC++ Joined Alias(A) MissingArgError(assertion missing after %qs)
-comments
C ObjC C++ ObjC++ Alias(C)
-comments-in-macros
C ObjC C++ ObjC++ Alias(CC)
-define-macro
C ObjC C++ ObjC++ Separate Alias(D) MissingArgError(macro name missing after %qs)
-define-macro=
C ObjC C++ ObjC++ Joined Alias(D) MissingArgError(macro name missing after %qs)
-dependencies
C ObjC C++ ObjC++ Alias(M)
-dump
C ObjC C++ ObjC++ Separate Alias(d)
-dump=
C ObjC C++ ObjC++ Joined Alias(d)
-imacros
C ObjC C++ ObjC++ Separate Alias(imacros) MissingArgError(missing filename after %qs)
-imacros=
C ObjC C++ ObjC++ Joined Alias(imacros) MissingArgError(missing filename after %qs)
-include
C ObjC C++ ObjC++ Separate Alias(include) MissingArgError(missing filename after %qs)
-include=
C ObjC C++ ObjC++ Joined Alias(include) MissingArgError(missing filename after %qs)
-include-barrier
C ObjC C++ ObjC++ Alias(I, -)
-include-directory
C ObjC C++ ObjC++ Separate Alias(I) MissingArgError(missing path after %qs)
-include-directory=
C ObjC C++ ObjC++ Joined Alias(I) MissingArgError(missing path after %qs)
-include-directory-after
C ObjC C++ ObjC++ Separate Alias(idirafter) MissingArgError(missing path after %qs)
-include-directory-after=
C ObjC C++ ObjC++ Joined Alias(idirafter) MissingArgError(missing path after %qs)
-include-prefix
C ObjC C++ ObjC++ Separate Alias(iprefix)
-include-prefix=
C ObjC C++ ObjC++ JoinedOrMissing Alias(iprefix)
-include-with-prefix
C ObjC C++ ObjC++ Separate Alias(iwithprefix)
-include-with-prefix=
C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
-include-with-prefix-after
C ObjC C++ ObjC++ Separate Alias(iwithprefix)
-include-with-prefix-after=
C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
-include-with-prefix-before
C ObjC C++ ObjC++ Separate Alias(iwithprefixbefore)
-include-with-prefix-before=
C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefixbefore)
-no-integrated-cpp
Driver Alias(no-integrated-cpp)
-no-line-commands
C ObjC C++ ObjC++ Alias(P)
-no-standard-includes
C ObjC C++ ObjC++ Alias(nostdinc)
-no-warnings
C ObjC C++ ObjC++ Alias(w)
-output
C ObjC C++ ObjC++ Separate Alias(o)
-output=
C ObjC C++ ObjC++ Joined Alias(o)
-output-pch=
C ObjC C++ ObjC++ Joined Separate
-pedantic
C ObjC C++ ObjC++ Alias(pedantic)
-preprocess
C ObjC C++ ObjC++ Undocumented Alias(E)
-print-missing-file-dependencies
C ObjC C++ ObjC++ Alias(MG)
-trace-includes
C ObjC C++ ObjC++ Alias(H)
-traditional
Driver Alias(traditional)
-traditional-cpp
C ObjC C++ ObjC++ Alias(traditional-cpp)
-trigraphs
C ObjC C++ ObjC++ Alias(trigraphs)
-undefine-macro
C ObjC C++ ObjC++ Separate Alias(U) MissingArgError(macro name missing after %qs)
-undefine-macro=
C ObjC C++ ObjC++ Joined Alias(U) MissingArgError(macro name missing after %qs)
-user-dependencies
C ObjC C++ ObjC++ Alias(MM)
-verbose
Common C ObjC C++ ObjC++ Alias(v)
-write-dependencies
C ObjC C++ ObjC++ NoDriverArg Separate Alias(MD) MissingArgError(missing filename after %qs)
-write-user-dependencies
C ObjC C++ ObjC++ NoDriverArg Separate Alias(MMD) MissingArgError(missing filename after %qs)
A
C ObjC C++ ObjC++ Joined Separate MissingArgError(assertion missing after %qs)
-A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
C
C ObjC C++ ObjC++
Do not discard comments
CC
C ObjC C++ ObjC++
Do not discard comments in macro expansions
D
C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
-D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
E
C ObjC C++ ObjC++ Undocumented Var(flag_preprocess_only)
F
Driver C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
-F <dir> Add <dir> to the end of the main framework include path
H
C ObjC C++ ObjC++
Print the name of header files as they are used
I
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
-I <dir> Add <dir> to the end of the main include path
M
C ObjC C++ ObjC++
Generate make dependencies
MD
C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
Generate make dependencies and compile
MF
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
-MF <file> Write dependency output to the given file
MG
C ObjC C++ ObjC++
Treat missing header files as generated files
MM
C ObjC C++ ObjC++
Like -M but ignore system header files
MMD
C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
Like -MD but ignore system header files
MP
C ObjC C++ ObjC++
Generate phony targets for all headers
MQ
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
-MQ <target> Add a MAKE-quoted target
MT
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
-MT <target> Add an unquoted target
P
C ObjC C++ ObjC++
Do not generate #line directives
U
C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
-U<macro> Undefine <macro>
Wabi
C ObjC C++ ObjC++ LTO Var(warn_abi) Warning
Warn about things that will change when compiling with an ABI-compliant compiler
Wabi=
C ObjC C++ ObjC++ LTO Joined RejectNegative UInteger Warning
Warn about things that change between the current -fabi-version and the specified version
Wabi-tag
C++ ObjC++ Var(warn_abi_tag) Warning
Warn if a subobject has an abi_tag attribute that the complete object type does not have
Wpsabi
C ObjC C++ ObjC++ LTO Var(warn_psabi) Init(1) Undocumented
Waddress
C ObjC C++ ObjC++ Var(warn_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about suspicious uses of memory addresses
Wall
C ObjC C++ ObjC++ Warning
Enable most warning messages
Warray-bounds
LangEnabledBy(C ObjC C++ ObjC++,Wall)
; in common.opt
Wassign-intercept
ObjC ObjC++ Var(warn_assign_intercept) Warning
Warn whenever an Objective-C assignment is being intercepted by the garbage collector
Wbad-function-cast
C ObjC Var(warn_bad_function_cast) Warning
Warn about casting functions to incompatible types
Wbuiltin-macro-redefined
C ObjC C++ ObjC++ Warning
Warn when a built-in preprocessor macro is undefined or redefined
Wc++-compat
C ObjC Var(warn_cxx_compat) Warning
Warn about C constructs that are not in the common subset of C and C++
Wc++0x-compat
C++ ObjC++ Var(warn_cxx0x_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
Deprecated in favor of -Wc++11-compat
Wc++11-compat
C++ ObjC++ Warning Alias(Wc++0x-compat)
Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011
Wcast-qual
C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
Warn about casts which discard qualifiers
Wchar-subscripts
C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about subscripts whose type is \"char\"
Wclobbered
C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
Warn about variables that might be changed by \"longjmp\" or \"vfork\"
Wcomment
C ObjC C++ ObjC++ Warning
Warn about possibly nested block comments, and C++ comments spanning more than one physical line
Wcomments
C ObjC C++ ObjC++ Warning Alias(Wcomment)
Synonym for -Wcomment
Wconditionally-supported
C++ ObjC++ Var(warn_conditionally_supported) Warning
Warn for conditionally-supported constructs
Wconversion
C ObjC C++ ObjC++ Var(warn_conversion) Warning
Warn for implicit type conversions that may change a value
Wconversion-null
C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
Warn for converting NULL from/to a non-pointer type
Wctor-dtor-privacy
C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
Warn when all constructors and destructors are private
Wdeclaration-after-statement
C ObjC Var(warn_declaration_after_statement) Warning
Warn when a declaration is found after a statement
Wdelete-incomplete
C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
Warn when deleting a pointer to incomplete type
Wdelete-non-virtual-dtor
C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall)
Warn about deleting polymorphic objects with non-virtual destructors
Wdelete-non-virtual-dtor
LangEnabledBy(C++ ObjC++,Weffc++)
;
Wdeprecated
C C++ ObjC ObjC++ Var(warn_deprecated) Init(1) Warning
Warn if a deprecated compiler feature, class, method, or field is used
Wdiscarded-qualifiers
C ObjC Var(warn_discarded_qualifiers) Init(1) Warning
Warn if type qualifiers on pointers are discarded
Wdiv-by-zero
C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
Warn about compile-time integer division by zero
Weffc++
C++ ObjC++ Var(warn_ecpp) Warning
Warn about violations of Effective C++ style rules
Wempty-body
C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
Warn about an empty body in an if or else statement
Wendif-labels
C ObjC C++ ObjC++ Warning
Warn about stray tokens after #elif and #endif
Wenum-compare
C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall)
Warn about comparison of different enum types
Wenum-compare
LangEnabledBy(C ObjC,Wc++-compat)
;
Werror
C ObjC C++ ObjC++
; Documented in common.opt
Werror-implicit-function-declaration
C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
This switch is deprecated; use -Werror=implicit-function-declaration instead
Wfloat-conversion
C ObjC C++ ObjC++ Var(warn_float_conversion) LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
Warn for implicit type conversions that cause loss of floating point precision
Wfloat-equal
C ObjC C++ ObjC++ Var(warn_float_equal) Warning
Warn if testing floating point numbers for equality
Wformat
C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
Warn about printf/scanf/strftime/strfmon format string anomalies
Wformat-contains-nul
C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
Warn about format strings that contain NUL bytes
Wformat-extra-args
C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
Warn if passing too many arguments to a function for its format string
Wformat-nonliteral
C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
Warn about format strings that are not literals
Wformat-security
C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
Warn about possible security problems with format functions
Wformat-signedness
C ObjC C++ ObjC++ Var(warn_format_signedness) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
Warn about sign differences with format functions
Wformat-y2k
C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
Warn about strftime formats yielding 2-digit years
Wformat-zero-length
C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
Warn about zero-length formats
Wformat=
C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
Warn about printf/scanf/strftime/strfmon format string anomalies
Wignored-qualifiers
C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
Warn whenever type qualifiers are ignored.
Winit-self
C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
Warn about variables which are initialized to themselves
Wimplicit
C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
Warn about implicit declarations
Wdouble-promotion
C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
Warn about implicit conversions from \"float\" to \"double\"
Wimplicit-function-declaration
C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
Warn about implicit function declarations
Wimplicit-int
C ObjC Var(warn_implicit_int) Warning LangEnabledBy(C ObjC,Wimplicit)
Warn when a declaration does not specify a type
Wimport
C ObjC C++ ObjC++ Undocumented Ignore
Winherited-variadic-ctor
C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
Warn about C++11 inheriting constructors when the base has a variadic constructor
Wint-to-pointer-cast
C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
Warn when there is a cast to a pointer from an integer of a different size
Winvalid-offsetof
C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
Warn about invalid uses of the \"offsetof\" macro
Winvalid-pch
C ObjC C++ ObjC++ Warning
Warn about PCH files that are found but not used
Wjump-misses-init
C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
Warn when a jump misses a variable initialization
Wliteral-suffix
C++ ObjC++ Warning
Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.
Wlogical-op
C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
Warn when a logical operator is suspiciously always evaluating to true or false
Wlogical-not-parentheses
C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning
Warn when logical not is used on the left hand side operand of a comparison
Wlong-long
C ObjC C++ ObjC++ Var(warn_long_long) Init(-1) Warning
Do not warn about using \"long long\" when -pedantic
Wmain
C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
Warn about suspicious declarations of \"main\"
Wmain
LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
;
Wmissing-braces
C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
Warn about possibly missing braces around initializers
Wmissing-declarations
C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
Warn about global functions without previous declarations
Wmissing-field-initializers
C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
Warn about missing fields in struct initializers
Wsizeof-pointer-memaccess
C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about suspicious length parameters to certain string functions if the argument uses sizeof
Wsuggest-attribute=format
C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
Warn about functions which might be candidates for format attributes
Wswitch
C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about enumerated switches, with no default, missing a case
Wswitch-default
C ObjC C++ ObjC++ Var(warn_switch_default) Warning
Warn about enumerated switches missing a \"default:\" statement
Wswitch-enum
C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
Warn about all enumerated switches missing a specific case
Wswitch-bool
C ObjC C++ ObjC++ Var(warn_switch_bool) Warning Init(1)
Warn about switches with boolean controlling expression
Wmissing-format-attribute
C ObjC C++ ObjC++ Alias(Wsuggest-attribute=format)
;
Wmissing-include-dirs
C ObjC C++ ObjC++ Warning
Warn about user-specified include directories that do not exist
Wmissing-parameter-type
C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
Warn about function parameters declared without a type specifier in K&R-style functions
Wmissing-prototypes
C ObjC Var(warn_missing_prototypes) Warning
Warn about global functions without prototypes
Wmudflap
C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
Wmultichar
C ObjC C++ ObjC++ Warning
Warn about use of multi-character character constants
Wnarrowing
C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall)
Warn about narrowing conversions within { } that are ill-formed in C++11
Wnarrowing
C ObjC C++ ObjC++ LangEnabledBy(C++ ObjC++,Wc++0x-compat)
;
Wnested-externs
C ObjC Var(warn_nested_externs) Warning
Warn about \"extern\" declarations not at file scope
Wnoexcept
C++ ObjC++ Var(warn_noexcept) Warning
Warn when a noexcept expression evaluates to false even though the expression can't actually throw
Wnon-template-friend
C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
Warn when non-templatized friend functions are declared within a template
Wnon-virtual-dtor
C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
Warn about non-virtual destructors
Wnonnull
C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
Warn about NULL being passed to argument slots marked as requiring non-NULL
Wnonnull
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
;
Wnormalized=
C ObjC C++ ObjC++ Joined Warning
-Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
Wold-style-cast
C++ ObjC++ Var(warn_old_style_cast) Warning
Warn if a C-style cast is used in a program
Wold-style-declaration
C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
Warn for obsolescent usage in a declaration
Wold-style-definition
C ObjC Var(warn_old_style_definition) Warning
Warn if an old-style parameter definition is used
Wopenmp-simd
C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
Warn if a simd directive is overridden by the vectorizer cost model
Woverlength-strings
C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
Warn if a string is longer than the maximum portable length specified by the standard
Woverloaded-virtual
C++ ObjC++ Var(warn_overloaded_virtual) Warning
Warn about overloaded virtual function names
Woverride-init
C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
Warn about overriding initializers without side effects
Wpacked-bitfield-compat
C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
Warn about packed bit-fields whose offset changed in GCC 4.4
Wparentheses
C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about possibly missing parentheses
Wpedantic
C ObjC C++ ObjC++ Warning
; Documented in common.opt
Wpmf-conversions
C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
Warn when converting the type of pointers to member functions
Wpointer-arith
C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
Warn about function pointer arithmetic
Wpointer-sign
C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall)
Warn when a pointer differs in signedness in an assignment
Wpointer-sign
C ObjC LangEnabledBy(C ObjC,Wpedantic)
;
Wpointer-to-int-cast
C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
Warn when a pointer is cast to an integer of a different size
Wpragmas
C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
Warn about misuses of pragmas
Wdate-time
Common Var(cpp_warn_date_time) Warning
Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage
Wproperty-assign-default
ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
Warn if a property for an Objective-C object has no assign semantics specified
Wprotocol
ObjC ObjC++ Var(warn_protocol) Init(1) Warning
Warn if inherited methods are unimplemented
Wredundant-decls
C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
Warn about multiple declarations of the same object
Wreorder
C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
Warn when the compiler reorders code
Wreturn-local-addr
C ObjC C++ ObjC++ Var(warn_return_local_addr) Init(1) Warning
Warn about returning a pointer/reference to a local or temporary variable.
Wreturn-type
C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
Wselector
ObjC ObjC++ Var(warn_selector) Warning
Warn if a selector has multiple methods
Wshadow-ivar
ObjC ObjC++ Var(warn_shadow_ivar) EnabledBy(Wshadow) Init(1) Warning
Warn if a local declaration hides an instance variable
Wsequence-point
C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about possible violations of sequence point rules
Wsign-compare
C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
Warn about signed-unsigned comparisons
Wsign-compare
C ObjC C++ ObjC++ EnabledBy(Wextra)
;
Wsign-conversion
C ObjC C++ ObjC++ Var(warn_sign_conversion) LangEnabledBy(C ObjC,Wconversion)
Warn for implicit type conversions between signed and unsigned integers
Wsign-promo
C++ ObjC++ Var(warn_sign_promo) Warning
Warn when overload promotes from unsigned to signed
Wstrict-null-sentinel
C++ ObjC++ Warning Var(warn_strict_null_sentinel)
Warn about uncasted NULL used as sentinel
Wstrict-prototypes
C ObjC Var(warn_strict_prototypes) Warning
Warn about unprototyped function declarations
Wstrict-aliasing=
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0)
;
Wstrict-overflow=
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
;
Wstrict-selector-match
ObjC ObjC++ Var(warn_strict_selector_match) Warning
Warn if type signatures of candidate methods do not match exactly
Wsync-nand
C C++ Var(warn_sync_nand) Init(1) Warning
Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
Wsynth
C++ ObjC++ Var(warn_synth) Warning
Deprecated. This switch has no effect
Wsystem-headers
C ObjC C++ ObjC++ Warning
; Documented in common.opt
Wtraditional
C ObjC Var(warn_traditional) Warning
Warn about features not present in traditional C
Wtraditional-conversion
C ObjC Var(warn_traditional_conversion) Warning
Warn of prototypes causing type conversions different from what would happen in the absence of prototype
Wtrigraphs
C ObjC C++ ObjC++ Warning
Warn if trigraphs are encountered that might affect the meaning of the program
Wundeclared-selector
ObjC ObjC++ Var(warn_undeclared_selector) Warning
Warn about @selector()s without previously declared methods
Wundef
C ObjC C++ ObjC++ Warning
Warn if an undefined macro is used in an #if directive
Wuninitialized
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
;
Wmaybe-uninitialized
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
;
Wunknown-pragmas
C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
Warn about unrecognized pragmas
Wunsuffixed-float-constants
C ObjC Var(warn_unsuffixed_float_constants) Warning
Warn about unsuffixed float constants
Wunused
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
; documented in common.opt
Wunused-local-typedefs
C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
Warn when typedefs locally defined in a function are not used
Wunused-macros
C ObjC C++ ObjC++ Var(cpp_warn_unused_macros) Warning
Warn about macros defined in the main file that are not used
Wunused-result
C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value
Wvariadic-macros
C ObjC C++ ObjC++ Var(cpp_warn_variadic_macros) Init(1) Warning
Warn about using variadic macros
Wvarargs
C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
Warn about questionable usage of the macros used to retrieve variable arguments
Wvla
C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
Warn if a variable length array is used
Wvolatile-register-var
C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn when a register variable is declared volatile
Wvirtual-move-assign
C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
Warn if a virtual base has a non-trivial move assignment operator
Wwrite-strings
C ObjC C++ ObjC++ Var(warn_write_strings) Warning
In C++, nonzero means warn about deprecated conversion from string literals to 'char *'. In C, similar warning, except that the conversion is of course not deprecated by the ISO C standard.
Wzero-as-null-pointer-constant
C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
Warn when a literal '0' is used as null pointer
Wuseless-cast
C++ ObjC++ Var(warn_useless_cast) Warning
Warn about useless casts
ansi
C ObjC C++ ObjC++
A synonym for -std=c89 (for C) or -std=c++98 (for C++)
d
C ObjC C++ ObjC++ Joined
; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
fabi-compat-version=
C++ ObjC++ Joined RejectNegative UInteger Var(flag_abi_compat_version) Init(-1)
The version of the C++ ABI used for -Wabi warnings and link compatibility aliases
faccess-control
C++ ObjC++ Var(flag_access_control) Init(1)
Enforce class member access control semantics
fada-spec-parent=
C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
-fada-spec-parent=unit Dump Ada specs as child units of given parent
fall-virtual
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
fallow-parameterless-variadic-functions
C ObjC Var(flag_allow_parameterless_variadic_functions)
Allow variadic functions without named parameter
falt-external-templates
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
No longer supported
fasm
C ObjC C++ ObjC++ Var(flag_no_asm, 0)
Recognize the \"asm\" keyword
; Define extra predefined macros for use in libgcc.
fbuilding-libgcc
C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)
fbuiltin
C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
Recognize built-in functions
fbuiltin-
C ObjC C++ ObjC++ Joined
fcanonical-system-headers
C ObjC C++ ObjC++
Where shorter, use canonicalized paths to systems headers.
fcilkplus
C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
Enable Cilk Plus
fcond-mismatch
C ObjC C++ ObjC++
Allow the arguments of the '?' operator to have different types
fconserve-space
C++ ObjC++ Var(flag_conserve_space)
Does nothing. Preserved for backward compatibility.
fconstant-string-class=
ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
-fconst-string-class=<name> Use class <name> for constant strings
fconstexpr-depth=
C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
-fconstexpr-depth=<number> Specify maximum constexpr recursion depth
fdebug-cpp
C ObjC C++ ObjC++
Emit debug annotations during preprocessing
fdeduce-init-list
C++ ObjC++ Var(flag_deduce_init_list) Init(0)
-fdeduce-init-list enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list
fdeclone-ctor-dtor
C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
Factor complex constructors and destructors to favor space over speed
fdefault-inline
C++ ObjC++ Ignore
Does nothing. Preserved for backward compatibility.
fdirectives-only
C ObjC C++ ObjC++
Preprocess directives only.
fdollars-in-identifiers
C ObjC C++ ObjC++
Permit '$' as an identifier character
fdump-ada-spec
C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
Write all declarations as Ada code transitively
fdump-ada-spec-slim
C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
Write all declarations as Ada code for the given file only
felide-constructors
C++ ObjC++ Var(flag_elide_constructors) Init(1)
fenforce-eh-specs
C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
Generate code to check exception specifications
fenum-int-equiv
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
fexec-charset=
C ObjC C++ ObjC++ Joined RejectNegative
-fexec-charset=<cset> Convert all strings and character constants to character set <cset>
fextended-identifiers
C ObjC C++ ObjC++
Permit universal character names (\\u and \\U) in identifiers
finput-charset=
C ObjC C++ ObjC++ Joined RejectNegative
-finput-charset=<cset> Specify the default character set for source files
fextern-tls-init
C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
Support dynamic initialization of thread-local variables in a different translation unit
fexternal-templates
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
ffor-scope
C++ ObjC++ Var(flag_new_for_scope) Init(1)
Scope of for-init-statement variables is local to the loop
ffreestanding
C ObjC C++ ObjC++
Do not assume that standard C libraries and \"main\" exist
fgnu-keywords
C++ ObjC++ Var(flag_no_gnu_keywords, 0)
Recognize GNU-defined keywords
fgnu-runtime
ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
Generate code for GNU runtime environment
fgnu89-inline
C ObjC Var(flag_gnu89_inline) Init(-1)
Use traditional GNU semantics for inline functions
fguiding-decls
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
fhandle-exceptions
C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})