1; Options for the C, ObjC, C++ and ObjC++ front ends.
2; Copyright (C) 2003-2014 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
24Language
25C
26
27Language
28ObjC
29
30Language
31C++
32
33Language
34ObjC++
35
36-all-warnings
37C ObjC C++ ObjC++ Warning Alias(Wall)
38
39-ansi
40C ObjC C++ ObjC++ Alias(ansi)
41
42-assert
43C ObjC C++ ObjC++ Separate Alias(A) MissingArgError(assertion missing after %qs)
44
45-assert=
46C ObjC C++ ObjC++ Joined Alias(A) MissingArgError(assertion missing after %qs)
47
48-comments
49C ObjC C++ ObjC++ Alias(C)
50
51-comments-in-macros
52C ObjC C++ ObjC++ Alias(CC)
53
54-define-macro
55C ObjC C++ ObjC++ Separate Alias(D) MissingArgError(macro name missing after %qs)
56
57-define-macro=
58C ObjC C++ ObjC++ Joined Alias(D) MissingArgError(macro name missing after %qs)
59
60-dependencies
61C ObjC C++ ObjC++ Alias(M)
62
63-dump
64C ObjC C++ ObjC++ Separate Alias(d)
65
66-dump=
67C ObjC C++ ObjC++ Joined Alias(d)
68
69-imacros
70C ObjC C++ ObjC++ Separate Alias(imacros) MissingArgError(missing filename after %qs)
71
72-imacros=
73C ObjC C++ ObjC++ Joined Alias(imacros) MissingArgError(missing filename after %qs)
74
75-include
76C ObjC C++ ObjC++ Separate Alias(include) MissingArgError(missing filename after %qs)
77
78-include=
79C ObjC C++ ObjC++ Joined Alias(include) MissingArgError(missing filename after %qs)
80
81-include-barrier
82C ObjC C++ ObjC++ Alias(I, -)
83
84-include-directory
85C ObjC C++ ObjC++ Separate Alias(I) MissingArgError(missing path after %qs)
86
87-include-directory=
88C ObjC C++ ObjC++ Joined Alias(I) MissingArgError(missing path after %qs)
89
90-include-directory-after
91C ObjC C++ ObjC++ Separate Alias(idirafter) MissingArgError(missing path after %qs)
92
93-include-directory-after=
94C ObjC C++ ObjC++ Joined Alias(idirafter) MissingArgError(missing path after %qs)
95
96-include-prefix
97C ObjC C++ ObjC++ Separate Alias(iprefix)
98
99-include-prefix=
100C ObjC C++ ObjC++ JoinedOrMissing Alias(iprefix)
101
102-include-with-prefix
103C ObjC C++ ObjC++ Separate Alias(iwithprefix)
104
105-include-with-prefix=
106C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
107
108-include-with-prefix-after
109C ObjC C++ ObjC++ Separate Alias(iwithprefix)
110
111-include-with-prefix-after=
112C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
113
114-include-with-prefix-before
115C ObjC C++ ObjC++ Separate Alias(iwithprefixbefore)
116
117-include-with-prefix-before=
118C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefixbefore)
119
120-no-integrated-cpp
121Driver Alias(no-integrated-cpp)
122
123-no-line-commands
124C ObjC C++ ObjC++ Alias(P)
125
126-no-standard-includes
127C ObjC C++ ObjC++ Alias(nostdinc)
128
129-no-warnings
130C ObjC C++ ObjC++ Alias(w)
131
132-output
133C ObjC C++ ObjC++ Separate Alias(o)
134
135-output=
136C ObjC C++ ObjC++ Joined Alias(o)
137
138-output-pch=
139C ObjC C++ ObjC++ Joined Separate
140
141-pedantic
142C ObjC C++ ObjC++ Alias(pedantic)
143
144-preprocess
145C ObjC C++ ObjC++ Undocumented Alias(E)
146
147-print-missing-file-dependencies
148C ObjC C++ ObjC++ Alias(MG)
149
150-trace-includes
151C ObjC C++ ObjC++ Alias(H)
152
153-traditional
154Driver Alias(traditional)
155
156-traditional-cpp
157C ObjC C++ ObjC++ Alias(traditional-cpp)
158
159-trigraphs
160C ObjC C++ ObjC++ Alias(trigraphs)
161
162-undefine-macro
163C ObjC C++ ObjC++ Separate Alias(U) MissingArgError(macro name missing after %qs)
164
165-undefine-macro=
166C ObjC C++ ObjC++ Joined Alias(U) MissingArgError(macro name missing after %qs)
167
168-user-dependencies
169C ObjC C++ ObjC++ Alias(MM)
170
171-verbose
172Common C ObjC C++ ObjC++ Alias(v)
173
174-write-dependencies
175C ObjC C++ ObjC++ NoDriverArg Separate Alias(MD) MissingArgError(missing filename after %qs)
176
177-write-user-dependencies
178C ObjC C++ ObjC++ NoDriverArg Separate Alias(MMD) MissingArgError(missing filename after %qs)
179
180A
181C ObjC C++ ObjC++ Joined Separate MissingArgError(assertion missing after %qs)
182-A<question>=<answer>	Assert the <answer> to <question>.  Putting '-' before <question> disables the <answer> to <question>
183
184C
185C ObjC C++ ObjC++
186Do not discard comments
187
188CC
189C ObjC C++ ObjC++
190Do not discard comments in macro expansions
191
192D
193C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
194-D<macro>[=<val>]	Define a <macro> with <val> as its value.  If just <macro> is given, <val> is taken to be 1
195
196E
197C ObjC C++ ObjC++ Undocumented Var(flag_preprocess_only)
198
199F
200Driver C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
201-F <dir>	Add <dir> to the end of the main framework include path
202
203H
204C ObjC C++ ObjC++
205Print the name of header files as they are used
206
207I
208C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
209-I <dir>	Add <dir> to the end of the main include path
210
211M
212C ObjC C++ ObjC++
213Generate make dependencies
214
215MD
216C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
217Generate make dependencies and compile
218
219MF
220C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
221-MF <file>	Write dependency output to the given file
222
223MG
224C ObjC C++ ObjC++
225Treat missing header files as generated files
226
227MM
228C ObjC C++ ObjC++
229Like -M but ignore system header files
230
231MMD
232C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
233Like -MD but ignore system header files
234
235MP
236C ObjC C++ ObjC++
237Generate phony targets for all headers
238
239MQ
240C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
241-MQ <target>	Add a MAKE-quoted target
242
243MT
244C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
245-MT <target>	Add an unquoted target
246
247P
248C ObjC C++ ObjC++
249Do not generate #line directives
250
251U
252C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
253-U<macro>	Undefine <macro>
254
255Wabi
256C ObjC C++ ObjC++ LTO Var(warn_abi) Warning
257Warn about things that will change when compiling with an ABI-compliant compiler
258
259Wabi-tag
260C++ ObjC++ Var(warn_abi_tag) Warning
261Warn if a subobject has an abi_tag attribute that the complete object type does not have
262
263Wpsabi
264C ObjC C++ ObjC++ LTO Var(warn_psabi) Init(1) Undocumented
265
266Waddress
267C ObjC C++ ObjC++ Var(warn_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
268Warn about suspicious uses of memory addresses
269
270Wall
271C ObjC C++ ObjC++ Warning
272Enable most warning messages
273
274Warray-bounds
275LangEnabledBy(C ObjC C++ ObjC++,Wall)
276; in common.opt
277
278Wassign-intercept
279ObjC ObjC++ Var(warn_assign_intercept) Warning
280Warn whenever an Objective-C assignment is being intercepted by the garbage collector
281
282Wbad-function-cast
283C ObjC Var(warn_bad_function_cast) Warning
284Warn about casting functions to incompatible types
285
286Wbuiltin-macro-redefined
287C ObjC C++ ObjC++ Warning
288Warn when a built-in preprocessor macro is undefined or redefined
289
290Wc++-compat
291C ObjC Var(warn_cxx_compat) Warning
292Warn about C constructs that are not in the common subset of C and C++
293
294Wc++0x-compat
295C++ ObjC++ Var(warn_cxx0x_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
296Deprecated in favor of -Wc++11-compat
297
298Wc++11-compat
299C++ ObjC++ Warning Alias(Wc++0x-compat)
300Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011
301
302Wcast-qual
303C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
304Warn about casts which discard qualifiers
305
306Wchar-subscripts
307C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
308Warn about subscripts whose type is \"char\"
309
310Wclobbered
311C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
312Warn about variables that might be changed by \"longjmp\" or \"vfork\"
313
314Wcomment
315C ObjC C++ ObjC++ Warning
316Warn about possibly nested block comments, and C++ comments spanning more than one physical line
317
318Wcomments
319C ObjC C++ ObjC++ Warning Alias(Wcomment)
320Synonym for -Wcomment
321
322Wconditionally-supported
323C++ ObjC++ Var(warn_conditionally_supported) Warning
324Warn for conditionally-supported constructs
325
326Wconversion
327C ObjC C++ ObjC++ Var(warn_conversion) Warning
328Warn for implicit type conversions that may change a value
329
330Wconversion-null
331C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
332Warn for converting NULL from/to a non-pointer type
333
334Wctor-dtor-privacy
335C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
336Warn when all constructors and destructors are private
337
338Wdeclaration-after-statement
339C ObjC Var(warn_declaration_after_statement) Warning
340Warn when a declaration is found after a statement
341
342Wdelete-incomplete
343C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
344Warn when deleting a pointer to incomplete type
345
346Wdelete-non-virtual-dtor
347C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall)
348Warn about deleting polymorphic objects with non-virtual destructors
349
350Wdelete-non-virtual-dtor
351LangEnabledBy(C++ ObjC++,Weffc++)
352;
353
354Wdeprecated
355C C++ ObjC ObjC++ Var(warn_deprecated) Init(1) Warning
356Warn if a deprecated compiler feature, class, method, or field is used
357
358Wdiv-by-zero
359C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
360Warn about compile-time integer division by zero
361
362Weffc++
363C++ ObjC++ Var(warn_ecpp) Warning
364Warn about violations of Effective C++ style rules
365
366Wempty-body
367C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
368Warn about an empty body in an if or else statement
369
370Wendif-labels
371C ObjC C++ ObjC++ Warning
372Warn about stray tokens after #elif and #endif
373
374Wenum-compare
375C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall)
376Warn about comparison of different enum types
377
378Wenum-compare
379LangEnabledBy(C ObjC,Wc++-compat)
380;
381
382Werror
383C ObjC C++ ObjC++
384; Documented in common.opt
385
386Werror-implicit-function-declaration
387C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
388This switch is deprecated; use -Werror=implicit-function-declaration instead
389
390Wfloat-conversion
391C ObjC C++ ObjC++ Var(warn_float_conversion) LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
392Warn for implicit type conversions that cause loss of floating point precision
393
394Wfloat-equal
395C ObjC C++ ObjC++ Var(warn_float_equal) Warning
396Warn if testing floating point numbers for equality
397
398Wformat
399C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
400Warn about printf/scanf/strftime/strfmon format string anomalies
401
402Wformat-contains-nul
403C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
404Warn about format strings that contain NUL bytes
405
406Wformat-extra-args
407C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
408Warn if passing too many arguments to a function for its format string
409
410Wformat-nonliteral
411C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
412Warn about format strings that are not literals
413
414Wformat-security
415C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
416Warn about possible security problems with format functions
417
418Wformat-y2k
419C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
420Warn about strftime formats yielding 2-digit years
421
422Wformat-zero-length
423C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
424Warn about zero-length formats
425
426Wformat=
427C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
428Warn about printf/scanf/strftime/strfmon format string anomalies
429
430Wignored-qualifiers
431C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
432Warn whenever type qualifiers are ignored.
433
434Winit-self
435C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
436Warn about variables which are initialized to themselves
437
438Wimplicit
439C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
440Warn about implicit declarations
441
442Wdouble-promotion
443C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
444Warn about implicit conversions from \"float\" to \"double\"
445
446Wimplicit-function-declaration
447C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
448Warn about implicit function declarations
449
450Wimplicit-int
451C ObjC Var(warn_implicit_int) Warning LangEnabledBy(C ObjC,Wimplicit)
452Warn when a declaration does not specify a type
453
454Wimport
455C ObjC C++ ObjC++ Undocumented Ignore
456
457Winherited-variadic-ctor
458C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
459Warn about C++11 inheriting constructors when the base has a variadic constructor
460
461Wint-to-pointer-cast
462C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
463Warn when there is a cast to a pointer from an integer of a different size
464
465Winvalid-offsetof
466C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
467Warn about invalid uses of the \"offsetof\" macro
468
469Winvalid-pch
470C ObjC C++ ObjC++ Warning
471Warn about PCH files that are found but not used
472
473Wjump-misses-init
474C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
475Warn when a jump misses a variable initialization
476
477Wliteral-suffix
478C++ ObjC++ Warning
479Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.
480
481Wlogical-op
482C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
483Warn when a logical operator is suspiciously always evaluating to true or false
484
485Wlong-long
486C ObjC C++ ObjC++ Var(warn_long_long) Init(-1) Warning
487Do not warn about using \"long long\" when -pedantic
488
489Wmain
490C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
491Warn about suspicious declarations of \"main\"
492
493Wmain
494LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
495;
496
497Wmissing-braces
498C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
499Warn about possibly missing braces around initializers
500
501Wmissing-declarations
502C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
503Warn about global functions without previous declarations
504
505Wmissing-field-initializers
506C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
507Warn about missing fields in struct initializers
508
509Wsizeof-pointer-memaccess
510C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
511
512Wsuggest-attribute=format
513C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
514Warn about functions which might be candidates for format attributes
515
516Wswitch
517C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
518Warn about enumerated switches, with no default, missing a case
519
520Wswitch-default
521C ObjC C++ ObjC++ Var(warn_switch_default) Warning
522Warn about enumerated switches missing a \"default:\" statement
523
524Wswitch-enum
525C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
526Warn about all enumerated switches missing a specific case
527
528Wmissing-format-attribute
529C ObjC C++ ObjC++ Alias(Wsuggest-attribute=format)
530;
531
532Wmissing-include-dirs
533C ObjC C++ ObjC++ Warning
534Warn about user-specified include directories that do not exist
535
536Wmissing-parameter-type
537C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
538Warn about function parameters declared without a type specifier in K&R-style functions
539
540Wmissing-prototypes
541C ObjC Var(warn_missing_prototypes) Warning
542Warn about global functions without prototypes
543
544Wmudflap
545C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
546
547Wmultichar
548C ObjC C++ ObjC++ Warning
549Warn about use of multi-character character constants
550
551Wnarrowing
552C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall)
553Warn about narrowing conversions within { } that are ill-formed in C++11
554
555Wnarrowing
556C ObjC C++ ObjC++ LangEnabledBy(C++ ObjC++,Wc++0x-compat)
557;
558
559Wnested-externs
560C ObjC Var(warn_nested_externs) Warning
561Warn about \"extern\" declarations not at file scope
562
563Wnoexcept
564C++ ObjC++ Var(warn_noexcept) Warning
565Warn when a noexcept expression evaluates to false even though the expression can't actually throw
566
567Wnon-template-friend
568C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
569Warn when non-templatized friend functions are declared within a template
570
571Wnon-virtual-dtor
572C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
573Warn about non-virtual destructors
574
575Wnonnull
576C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
577Warn about NULL being passed to argument slots marked as requiring non-NULL
578
579Wnonnull
580C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
581;
582
583Wnormalized=
584C ObjC C++ ObjC++ Joined Warning
585-Wnormalized=<id|nfc|nfkc>	Warn about non-normalised Unicode strings
586
587Wold-style-cast
588C++ ObjC++ Var(warn_old_style_cast) Warning
589Warn if a C-style cast is used in a program
590
591Wold-style-declaration
592C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
593Warn for obsolescent usage in a declaration
594
595Wold-style-definition
596C ObjC Var(warn_old_style_definition) Warning
597Warn if an old-style parameter definition is used
598
599Wopenmp-simd
600C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
601Warn if a simd directive is overridden by the vectorizer cost model
602
603Woverlength-strings
604C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
605Warn if a string is longer than the maximum portable length specified by the standard
606
607Woverloaded-virtual
608C++ ObjC++ Var(warn_overloaded_virtual) Warning
609Warn about overloaded virtual function names
610
611Woverride-init
612C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
613Warn about overriding initializers without side effects
614
615Wpacked-bitfield-compat
616C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
617Warn about packed bit-fields whose offset changed in GCC 4.4
618
619Wparentheses
620C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
621Warn about possibly missing parentheses
622
623Wpedantic
624C ObjC C++ ObjC++ Warning
625; Documented in common.opt
626
627Wpmf-conversions
628C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
629Warn when converting the type of pointers to member functions
630
631Wpointer-arith
632C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
633Warn about function pointer arithmetic
634
635Wpointer-sign
636C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall)
637Warn when a pointer differs in signedness in an assignment
638
639Wpointer-sign
640C ObjC LangEnabledBy(C ObjC,Wpedantic)
641;
642
643Wpointer-to-int-cast
644C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
645Warn when a pointer is cast to an integer of a different size
646
647Wpragmas
648C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
649Warn about misuses of pragmas
650
651Wdate-time
652Common Var(cpp_warn_date_time) Warning
653Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage
654
655Wproperty-assign-default
656ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
657Warn if a property for an Objective-C object has no assign semantics specified
658
659Wprotocol
660ObjC ObjC++ Var(warn_protocol) Init(1) Warning
661Warn if inherited methods are unimplemented
662
663Wredundant-decls
664C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
665Warn about multiple declarations of the same object
666
667Wreorder
668C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
669Warn when the compiler reorders code
670
671Wreturn-local-addr
672C ObjC C++ ObjC++ Var(warn_return_local_addr) Init(1) Warning
673Warn about returning a pointer/reference to a local or temporary variable.
674
675Wreturn-type
676C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
677Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
678
679Wselector
680ObjC ObjC++ Var(warn_selector) Warning
681Warn if a selector has multiple methods
682
683Wsequence-point
684C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
685Warn about possible violations of sequence point rules
686
687Wsign-compare
688C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
689Warn about signed-unsigned comparisons
690
691Wsign-compare
692C ObjC C++ ObjC++ EnabledBy(Wextra)
693;
694
695Wsign-conversion
696C ObjC C++ ObjC++ Var(warn_sign_conversion) LangEnabledBy(C ObjC,Wconversion)
697Warn for implicit type conversions between signed and unsigned integers
698
699Wsign-promo
700C++ ObjC++ Var(warn_sign_promo) Warning
701Warn when overload promotes from unsigned to signed
702
703Wstrict-null-sentinel
704C++ ObjC++ Warning Var(warn_strict_null_sentinel)
705Warn about uncasted NULL used as sentinel
706
707Wstrict-prototypes
708C ObjC Var(warn_strict_prototypes) Warning
709Warn about unprototyped function declarations
710
711Wstrict-aliasing=
712C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0)
713;
714
715Wstrict-overflow=
716C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
717;
718
719Wstrict-selector-match
720ObjC ObjC++ Var(warn_strict_selector_match) Warning
721Warn if type signatures of candidate methods do not match exactly
722
723Wsync-nand
724C C++ Var(warn_sync_nand) Init(1) Warning
725Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
726
727Wsynth
728C++ ObjC++ Var(warn_synth) Warning
729Deprecated.  This switch has no effect
730
731Wsystem-headers
732C ObjC C++ ObjC++ Warning
733; Documented in common.opt
734
735Wtraditional
736C ObjC Var(warn_traditional) Warning
737Warn about features not present in traditional C
738
739Wtraditional-conversion
740C ObjC Var(warn_traditional_conversion) Warning
741Warn of prototypes causing type conversions different from what would happen in the absence of prototype
742
743Wtrigraphs
744C ObjC C++ ObjC++ Warning
745Warn if trigraphs are encountered that might affect the meaning of the program
746
747Wundeclared-selector
748ObjC ObjC++ Var(warn_undeclared_selector) Warning
749Warn about @selector()s without previously declared methods
750
751Wundef
752C ObjC C++ ObjC++ Warning
753Warn if an undefined macro is used in an #if directive
754
755Wuninitialized
756C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
757;
758
759Wmaybe-uninitialized
760C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
761;
762
763Wunknown-pragmas
764C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
765Warn about unrecognized pragmas
766
767Wunsuffixed-float-constants
768C ObjC Var(warn_unsuffixed_float_constants) Warning
769Warn about unsuffixed float constants
770
771Wunused
772C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
773; documented in common.opt
774
775Wunused-local-typedefs
776C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
777Warn when typedefs locally defined in a function are not used
778
779Wunused-macros
780C ObjC C++ ObjC++ Var(cpp_warn_unused_macros) Warning
781Warn about macros defined in the main file that are not used
782
783Wunused-result
784C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
785Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value
786
787Wvariadic-macros
788C ObjC C++ ObjC++ Var(cpp_warn_variadic_macros) Init(1) Warning
789Warn about using variadic macros
790
791Wvarargs
792C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
793Warn about questionable usage of the macros used to retrieve variable arguments
794
795Wvla
796C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
797Warn if a variable length array is used
798
799Wvolatile-register-var
800C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
801Warn when a register variable is declared volatile
802
803Wvirtual-move-assign
804C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
805Warn if a virtual base has a non-trivial move assignment operator
806
807Wwrite-strings
808C ObjC C++ ObjC++ Var(warn_write_strings) Warning
809In 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.
810
811Wzero-as-null-pointer-constant
812C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
813Warn when a literal '0' is used as null pointer
814
815Wuseless-cast
816C++ ObjC++ Var(warn_useless_cast) Warning
817Warn about useless casts
818
819ansi
820C ObjC C++ ObjC++
821A synonym for -std=c89 (for C) or -std=c++98 (for C++)
822
823d
824C ObjC C++ ObjC++ Joined
825; Documented in common.opt.  FIXME - what about -dI, -dD, -dN and -dD?
826
827faccess-control
828C++ ObjC++ Var(flag_access_control) Init(1)
829Enforce class member access control semantics
830
831fada-spec-parent=
832C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
833-fada-spec-parent=unit  Dump Ada specs as child units of given parent
834
835fall-virtual
836C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
837
838fallow-parameterless-variadic-functions
839C ObjC Var(flag_allow_parameterless_variadic_functions)
840Allow variadic functions without named parameter
841
842falt-external-templates
843C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
844No longer supported
845
846fasm
847C ObjC C++ ObjC++ Var(flag_no_asm, 0)
848Recognize the \"asm\" keyword
849
850; Define extra predefined macros for use in libgcc.
851fbuilding-libgcc
852C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)
853
854fbuiltin
855C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
856Recognize built-in functions
857
858fbuiltin-
859C ObjC C++ ObjC++ Joined
860
861fcanonical-system-headers
862C ObjC C++ ObjC++
863Where shorter, use canonicalized paths to systems headers.
864
865fcilkplus
866C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
867Enable Cilk Plus
868
869fcond-mismatch
870C ObjC C++ ObjC++
871Allow the arguments of the '?' operator to have different types
872
873fconserve-space
874C++ ObjC++ Var(flag_conserve_space)
875Does nothing.  Preserved for backward compatibility.
876
877fconstant-string-class=
878ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
879-fconst-string-class=<name>	Use class <name> for constant strings
880
881fconstexpr-depth=
882C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
883-fconstexpr-depth=<number>	Specify maximum constexpr recursion depth
884
885fdebug-cpp
886C ObjC C++ ObjC++
887Emit debug annotations during preprocessing
888
889fdeduce-init-list
890C++ ObjC++ Var(flag_deduce_init_list) Init(0)
891-fdeduce-init-list	enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list
892
893fdeclone-ctor-dtor
894C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
895Factor complex constructors and destructors to favor space over speed
896
897fdefault-inline
898C++ ObjC++ Ignore
899Does nothing.  Preserved for backward compatibility.
900
901fdirectives-only
902C ObjC C++ ObjC++
903Preprocess directives only.
904
905fdollars-in-identifiers
906C ObjC C++ ObjC++
907Permit '$' as an identifier character
908
909fdump-ada-spec
910C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
911Write all declarations as Ada code transitively
912
913fdump-ada-spec-slim
914C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
915Write all declarations as Ada code for the given file only
916
917felide-constructors
918C++ ObjC++ Var(flag_elide_constructors) Init(1)
919
920fenforce-eh-specs
921C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
922Generate code to check exception specifications
923
924fenum-int-equiv
925C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
926
927fexec-charset=
928C ObjC C++ ObjC++ Joined RejectNegative
929-fexec-charset=<cset>	Convert all strings and character constants to character set <cset>
930
931fextended-identifiers
932C ObjC C++ ObjC++
933Permit universal character names (\\u and \\U) in identifiers
934
935finput-charset=
936C ObjC C++ ObjC++ Joined RejectNegative
937-finput-charset=<cset>	Specify the default character set for source files
938
939fextern-tls-init
940C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
941Support dynamic initialization of thread-local variables in a different translation unit
942
943fexternal-templates
944C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
945
946ffor-scope
947C++ ObjC++ Var(flag_new_for_scope) Init(1)
948Scope of for-init-statement variables is local to the loop
949
950ffreestanding
951C ObjC C++ ObjC++
952Do not assume that standard C libraries and \"main\" exist
953
954fgnu-keywords
955C++ ObjC++ Var(flag_no_gnu_keywords, 0)
956Recognize GNU-defined keywords
957
958fgnu-runtime
959ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
960Generate code for GNU runtime environment
961
962fgnu89-inline
963C ObjC Var(flag_gnu89_inline) Init(-1)
964Use traditional GNU semantics for inline functions
965
966fguiding-decls
967C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
968
969fhandle-exceptions
970C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})
971
972fhonor-std
973C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
974
975fhosted
976C ObjC
977Assume normal C execution environment
978
979fhuge-objects
980C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
981No longer supported
982
983fimplement-inlines
984C++ ObjC++ Var(flag_implement_inlines) Init(1)
985Export functions even if they can be inlined
986
987fimplicit-inline-templates
988C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
989Emit implicit instantiations of inline templates
990
991fimplicit-templates
992C++ ObjC++ Var(flag_implicit_templates) Init(1)
993Emit implicit instantiations of templates
994
995ffriend-injection
996C++ ObjC++ Var(flag_friend_injection)
997Inject friend functions into enclosing namespace
998
999fkeep-inline-dllexport
1000C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
1001Don't emit dllexported inline functions unless needed
1002
1003flabels-ok
1004C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1005
1006flax-vector-conversions
1007C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
1008Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
1009
1010fms-extensions
1011C ObjC C++ ObjC++ Var(flag_ms_extensions)
1012Don't warn about uses of Microsoft extensions
1013
1014fmudflap
1015C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1016
1017fmudflapth
1018C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1019
1020fmudflapir
1021C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1022
1023fname-mangling-version-
1024C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)
1025
1026fnew-abi
1027C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1028
1029fnext-runtime
1030ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime)
1031Generate code for NeXT (Apple Mac OS X) runtime environment
1032
1033fnil-receivers
1034ObjC ObjC++ Var(flag_nil_receivers) Init(1)
1035Assume that receivers of Objective-C messages may be nil
1036
1037fnonansi-builtins
1038C++ ObjC++ Var(flag_no_nonansi_builtin, 0)
1039
1040fnonnull-objects
1041C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1042
1043fnothrow-opt
1044C++ ObjC++ Optimization Var(flag_nothrow_opt)
1045Treat a throw() exception specification as noexcept to improve code size
1046
1047fobjc-abi-version=
1048ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi)
1049Specify which ABI to use for Objective-C family code and meta-data generation.
1050
1051; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
1052; to initialize any non-POD ivars in Objective-C++ classes.
1053fobjc-call-cxx-cdtors
1054ObjC++ Var(flag_objc_call_cxx_cdtors)
1055Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
1056
1057fobjc-direct-dispatch
1058ObjC ObjC++ Var(flag_objc_direct_dispatch)
1059Allow fast jumps to the message dispatcher
1060
1061; Nonzero means that we will allow new ObjC exception syntax (@throw,
1062; @try, etc.) in source code.
1063fobjc-exceptions
1064ObjC ObjC++ Var(flag_objc_exceptions)
1065Enable Objective-C exception and synchronization syntax
1066
1067fobjc-gc
1068ObjC ObjC++ LTO Var(flag_objc_gc)
1069Enable garbage collection (GC) in Objective-C/Objective-C++ programs
1070
1071fobjc-nilcheck
1072ObjC ObjC++ Var(flag_objc_nilcheck,1)
1073Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.
1074
1075; Nonzero means that we generate NeXT setjmp based exceptions.
1076fobjc-sjlj-exceptions
1077ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
1078Enable Objective-C setjmp exception handling runtime
1079
1080fobjc-std=objc1
1081ObjC ObjC++ Var(flag_objc1_only)
1082Conform to the Objective-C 1.0 language as implemented in GCC 4.0
1083
1084fopenmp
1085C ObjC C++ ObjC++ Var(flag_openmp)
1086Enable OpenMP (implies -frecursive in Fortran)
1087
1088fopenmp-simd
1089C ObjC C++ ObjC++ Var(flag_openmp_simd)
1090Enable OpenMP's SIMD directives
1091
1092foperator-names
1093C++ ObjC++
1094Recognize C++ keywords like \"compl\" and \"xor\"
1095
1096foptional-diags
1097C++ ObjC++ Ignore
1098Does nothing.  Preserved for backward compatibility.
1099
1100fpch-deps
1101C ObjC C++ ObjC++
1102
1103fpch-preprocess
1104C ObjC C++ ObjC++
1105Look for and use PCH files even when preprocessing
1106
1107fpermissive
1108C++ ObjC++ Var(flag_permissive)
1109Downgrade conformance errors to warnings
1110
1111fplan9-extensions
1112C ObjC Var(flag_plan9_extensions)
1113Enable Plan 9 language extensions
1114
1115fpreprocessed
1116C ObjC C++ ObjC++
1117Treat the input file as already preprocessed
1118
1119ftrack-macro-expansion
1120C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1121; converted into ftrack-macro-expansion=
1122
1123ftrack-macro-expansion=
1124C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1125-ftrack-macro-expansion=<0|1|2>  Track locations of tokens coming from macro expansion and display them in error messages
1126
1127fpretty-templates
1128C++ ObjC++ Var(flag_pretty_templates) Init(1)
1129-fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments
1130
1131freplace-objc-classes
1132ObjC ObjC++ LTO Var(flag_replace_objc_classes)
1133Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
1134
1135frepo
1136C++ ObjC++
1137Enable automatic template instantiation
1138
1139frtti
1140C++ ObjC++ Optimization Var(flag_rtti) Init(1)
1141Generate run time type descriptor information
1142
1143fshort-double
1144C ObjC C++ ObjC++ LTO Optimization Var(flag_short_double)
1145Use the same size for double as for float
1146
1147fshort-enums
1148C ObjC C++ ObjC++ Optimization Var(flag_short_enums)
1149Use the narrowest integer type possible for enumeration types
1150
1151fshort-wchar
1152C ObjC C++ ObjC++ Optimization Var(flag_short_wchar)
1153Force the underlying type for \"wchar_t\" to be \"unsigned short\"
1154
1155fsigned-bitfields
1156C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
1157When \"signed\" or \"unsigned\" is not given make the bitfield signed
1158
1159fsigned-char
1160C ObjC C++ ObjC++ LTO Var(flag_signed_char)
1161Make \"char\" signed by default
1162
1163fsquangle
1164C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1165
1166fstats
1167C++ ObjC++ Var(flag_detailed_statistics)
1168Display statistics accumulated during compilation
1169
1170fstrict-enums
1171C++ ObjC++ Optimization Var(flag_strict_enums)
1172Assume that values of enumeration type are always within the minimum range of that type
1173
1174fstrict-prototype
1175C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1176
1177ftabstop=
1178C ObjC C++ ObjC++ Joined RejectNegative UInteger
1179-ftabstop=<number>	Distance between tab stops for column reporting
1180
1181ftemplate-backtrace-limit=
1182C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
1183Set the maximum number of template instantiation notes for a single warning or error
1184
1185ftemplate-depth-
1186C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)
1187
1188ftemplate-depth=
1189C++ ObjC++ Joined RejectNegative UInteger
1190-ftemplate-depth=<number>	Specify maximum template instantiation depth
1191
1192fthis-is-variable
1193C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1194
1195fthreadsafe-statics
1196C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
1197-fno-threadsafe-statics	Do not generate thread-safe code for initializing local statics
1198
1199funsigned-bitfields
1200C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
1201When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
1202
1203funsigned-char
1204C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
1205Make \"char\" unsigned by default
1206
1207fuse-cxa-atexit
1208C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
1209Use __cxa_atexit to register destructors
1210
1211fuse-cxa-get-exception-ptr
1212C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
1213Use __cxa_get_exception_ptr in exception handling
1214
1215fvisibility-inlines-hidden
1216C++ ObjC++
1217Marks all inlined functions and methods as having hidden visibility
1218
1219fvisibility-ms-compat
1220C++ ObjC++ Var(flag_visibility_ms_compat)
1221Changes visibility to match Microsoft Visual Studio by default
1222
1223fvtable-gc
1224C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1225No longer supported
1226
1227fvtable-thunks
1228C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1229No longer supported
1230
1231fweak
1232C++ ObjC++ Var(flag_weak) Init(1)
1233Emit common-like symbols as weak symbols
1234
1235fwide-exec-charset=
1236C ObjC C++ ObjC++ Joined RejectNegative
1237-fwide-exec-charset=<cset>	Convert all wide strings and character constants to character set <cset>
1238
1239fworking-directory
1240C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
1241Generate a #line directive pointing at the current working directory
1242
1243fxref
1244C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1245No longer supported
1246
1247fzero-link
1248ObjC ObjC++ Var(flag_zero_link)
1249Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
1250
1251gen-decls
1252ObjC ObjC++ Var(flag_gen_declaration)
1253Dump declarations to a .decl file
1254
1255femit-struct-debug-baseonly
1256C ObjC C++ ObjC++
1257-femit-struct-debug-baseonly	Aggressive reduced debug info for structs
1258
1259femit-struct-debug-reduced
1260C ObjC C++ ObjC++
1261-femit-struct-debug-reduced	Conservative reduced debug info for structs
1262
1263femit-struct-debug-detailed=
1264C ObjC C++ ObjC++ Joined
1265-femit-struct-debug-detailed=<spec-list>	Detailed reduced debug info for structs
1266
1267fext-numeric-literals
1268C++ ObjC++
1269Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding
1270number literal rather than a user-defined number literal.
1271
1272idirafter
1273C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1274-idirafter <dir>	Add <dir> to the end of the system include path
1275
1276imacros
1277C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1278-imacros <file>	Accept definition of macros in <file>
1279
1280imultilib
1281C ObjC C++ ObjC++ Joined Separate
1282-imultilib <dir>	Set <dir> to be the multilib include subdirectory
1283
1284include
1285C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1286-include <file>	Include the contents of <file> before other files
1287
1288iprefix
1289C ObjC C++ ObjC++ Joined Separate
1290-iprefix <path>	Specify <path> as a prefix for next two options
1291
1292isysroot
1293C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1294-isysroot <dir>	Set <dir> to be the system root directory
1295
1296isystem
1297C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1298-isystem <dir>	Add <dir> to the start of the system include path
1299
1300iquote
1301C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1302-iquote <dir>	Add <dir> to the end of the quote include path
1303
1304iwithprefix
1305C ObjC C++ ObjC++ Joined Separate
1306-iwithprefix <dir>	Add <dir> to the end of the system include path
1307
1308iwithprefixbefore
1309C ObjC C++ ObjC++ Joined Separate
1310-iwithprefixbefore <dir>	Add <dir> to the end of the main include path
1311
1312lang-asm
1313C Undocumented RejectDriver
1314
1315no-integrated-cpp
1316Driver
1317
1318nostdinc
1319C ObjC C++ ObjC++
1320Do not search standard system include directories (those specified with -isystem will still be used)
1321
1322nostdinc++
1323C++ ObjC++
1324Do not search standard system include directories for C++
1325
1326o
1327C ObjC C++ ObjC++ Joined Separate
1328; Documented in common.opt
1329
1330pedantic
1331C ObjC C++ ObjC++ Alias(Wpedantic)
1332; Documented in common.opt
1333
1334print-objc-runtime-info
1335ObjC ObjC++
1336Generate C header of platform-specific features
1337
1338remap
1339C ObjC C++ ObjC++
1340Remap file names when including files
1341
1342std=c++98
1343C++ ObjC++
1344Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1345
1346std=c++03
1347C++ ObjC++ Alias(std=c++98)
1348Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1349
1350std=c++11
1351C++ ObjC++
1352Conform to the ISO 2011 C++ standard
1353
1354std=c++0x
1355C++ ObjC++ Alias(std=c++11) Undocumented
1356Deprecated in favor of -std=c++11
1357
1358std=c++1y
1359C++ ObjC++
1360Conform to the ISO 2014(?) C++ draft standard (experimental and incomplete support)
1361
1362std=c++14
1363C++ ObjC++ Alias(std=c++1y) Undocumented
1364
1365std=c11
1366C ObjC
1367Conform to the ISO 2011 C standard (experimental and incomplete support)
1368
1369std=c1x
1370C ObjC Alias(std=c11)
1371Deprecated in favor of -std=c11
1372
1373std=c89
1374C ObjC Alias(std=c90)
1375Conform to the ISO 1990 C standard
1376
1377std=c90
1378C ObjC
1379Conform to the ISO 1990 C standard
1380
1381std=c99
1382C ObjC
1383Conform to the ISO 1999 C standard
1384
1385std=c9x
1386C ObjC Alias(std=c99)
1387Deprecated in favor of -std=c99
1388
1389std=gnu++98
1390C++ ObjC++
1391Conform to the ISO 1998 C++ standard revised by the 2003 technical
1392corrigendum with GNU extensions
1393
1394std=gnu++03
1395C++ ObjC++ Alias(std=gnu++98)
1396Conform to the ISO 1998 C++ standard revised by the 2003 technical
1397corrigendum with GNU extensions
1398
1399std=gnu++11
1400C++ ObjC++
1401Conform to the ISO 2011 C++ standard with GNU extensions (experimental and incomplete support)
1402
1403std=gnu++0x
1404C++ ObjC++ Alias(std=gnu++11)
1405Deprecated in favor of -std=gnu++11
1406
1407std=gnu++1y
1408C++ ObjC++
1409Conform to the ISO 201y(7?) C++ draft standard with GNU extensions (experimental and incomplete support)
1410
1411std=gnu++14
1412C++ ObjC++ Alias(std=gnu++1y) Undocumented
1413
1414std=gnu11
1415C ObjC
1416Conform to the ISO 2011 C standard with GNU extensions (experimental and incomplete support)
1417
1418std=gnu1x
1419C ObjC Alias(std=gnu11)
1420Deprecated in favor of -std=gnu11
1421
1422std=gnu89
1423C ObjC Alias(std=gnu90)
1424Conform to the ISO 1990 C standard with GNU extensions
1425
1426std=gnu90
1427C ObjC
1428Conform to the ISO 1990 C standard with GNU extensions
1429
1430std=gnu99
1431C ObjC
1432Conform to the ISO 1999 C standard with GNU extensions
1433
1434std=gnu9x
1435C ObjC Alias(std=gnu99)
1436Deprecated in favor of -std=gnu99
1437
1438std=iso9899:1990
1439C ObjC Alias(std=c90)
1440Conform to the ISO 1990 C standard
1441
1442std=iso9899:199409
1443C ObjC
1444Conform to the ISO 1990 C standard as amended in 1994
1445
1446std=iso9899:1999
1447C ObjC Alias(std=c99)
1448Conform to the ISO 1999 C standard
1449
1450std=iso9899:199x
1451C ObjC Alias(std=c99)
1452Deprecated in favor of -std=iso9899:1999
1453
1454std=iso9899:2011
1455C ObjC Alias(std=c11)
1456Conform to the ISO 2011 C standard (experimental and incomplete support)
1457
1458traditional
1459Driver
1460
1461traditional-cpp
1462C ObjC C++ ObjC++
1463Enable traditional preprocessing
1464
1465trigraphs
1466C ObjC C++ ObjC++
1467-trigraphs	Support ISO C trigraphs
1468
1469undef
1470C ObjC C++ ObjC++ Var(flag_undef)
1471Do not predefine system-specific and GCC-specific macros
1472
1473v
1474C ObjC C++ ObjC++
1475; Documented in common.opt
1476
1477w
1478C ObjC C++ ObjC++
1479; Documented in common.opt
1480
1481; This comment is to ensure we retain the blank line above.
1482