1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003-2015 Free Software Foundation, Inc.
4 ; This file is part of GCC.
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
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
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/>.
20 ; See the GCC internals manual for a description of this file's format.
22 ; Please try to keep this file in ASCII collating order.
37 C ObjC C++ ObjC++ Warning Alias(Wall)
40 C ObjC C++ ObjC++ Alias(ansi)
43 C ObjC C++ ObjC++ Separate Alias(A) MissingArgError(assertion missing after %qs)
46 C ObjC C++ ObjC++ Joined Alias(A) MissingArgError(assertion missing after %qs)
49 C ObjC C++ ObjC++ Alias(C)
52 C ObjC C++ ObjC++ Alias(CC)
55 C ObjC C++ ObjC++ Separate Alias(D) MissingArgError(macro name missing after %qs)
58 C ObjC C++ ObjC++ Joined Alias(D) MissingArgError(macro name missing after %qs)
61 C ObjC C++ ObjC++ Alias(M)
64 C ObjC C++ ObjC++ Separate Alias(d)
67 C ObjC C++ ObjC++ Joined Alias(d)
70 C ObjC C++ ObjC++ Separate Alias(imacros) MissingArgError(missing filename after %qs)
73 C ObjC C++ ObjC++ Joined Alias(imacros) MissingArgError(missing filename after %qs)
76 C ObjC C++ ObjC++ Separate Alias(include) MissingArgError(missing filename after %qs)
79 C ObjC C++ ObjC++ Joined Alias(include) MissingArgError(missing filename after %qs)
82 C ObjC C++ ObjC++ Alias(I, -)
85 C ObjC C++ ObjC++ Separate Alias(I) MissingArgError(missing path after %qs)
88 C ObjC C++ ObjC++ Joined Alias(I) MissingArgError(missing path after %qs)
90 -include-directory-after
91 C ObjC C++ ObjC++ Separate Alias(idirafter) MissingArgError(missing path after %qs)
93 -include-directory-after=
94 C ObjC C++ ObjC++ Joined Alias(idirafter) MissingArgError(missing path after %qs)
97 C ObjC C++ ObjC++ Separate Alias(iprefix)
100 C ObjC C++ ObjC++ JoinedOrMissing Alias(iprefix)
103 C ObjC C++ ObjC++ Separate Alias(iwithprefix)
105 -include-with-prefix=
106 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
108 -include-with-prefix-after
109 C ObjC C++ ObjC++ Separate Alias(iwithprefix)
111 -include-with-prefix-after=
112 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
114 -include-with-prefix-before
115 C ObjC C++ ObjC++ Separate Alias(iwithprefixbefore)
117 -include-with-prefix-before=
118 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefixbefore)
121 Driver Alias(no-integrated-cpp)
124 C ObjC C++ ObjC++ Alias(P)
126 -no-standard-includes
127 C ObjC C++ ObjC++ Alias(nostdinc)
130 C ObjC C++ ObjC++ Alias(w)
133 C ObjC C++ ObjC++ Separate Alias(o)
136 C ObjC C++ ObjC++ Joined Alias(o)
139 C ObjC C++ ObjC++ Joined Separate
142 C ObjC C++ ObjC++ Alias(pedantic)
145 C ObjC C++ ObjC++ Undocumented Alias(E)
147 -print-missing-file-dependencies
148 C ObjC C++ ObjC++ Alias(MG)
151 C ObjC C++ ObjC++ Alias(H)
154 Driver Alias(traditional)
157 C ObjC C++ ObjC++ Alias(traditional-cpp)
160 C ObjC C++ ObjC++ Alias(trigraphs)
163 C ObjC C++ ObjC++ Separate Alias(U) MissingArgError(macro name missing after %qs)
166 C ObjC C++ ObjC++ Joined Alias(U) MissingArgError(macro name missing after %qs)
169 C ObjC C++ ObjC++ Alias(MM)
172 Common C ObjC C++ ObjC++ Alias(v)
175 C ObjC C++ ObjC++ NoDriverArg Separate Alias(MD) MissingArgError(missing filename after %qs)
177 -write-user-dependencies
178 C ObjC C++ ObjC++ NoDriverArg Separate Alias(MMD) MissingArgError(missing filename after %qs)
181 C 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>
186 Do not discard comments
190 Do not discard comments in macro expansions
193 C 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
197 C ObjC C++ ObjC++ Undocumented Var(flag_preprocess_only)
200 Driver 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
205 Print the name of header files as they are used
208 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
209 -I <dir> Add <dir> to the end of the main include path
213 Generate make dependencies
216 C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
217 Generate make dependencies and compile
220 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
221 -MF <file> Write dependency output to the given file
225 Treat missing header files as generated files
229 Like -M but ignore system header files
232 C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
233 Like -MD but ignore system header files
237 Generate phony targets for all headers
240 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
241 -MQ <target> Add a MAKE-quoted target
244 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
245 -MT <target> Add an unquoted target
249 Do not generate #line directives
252 C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
253 -U<macro> Undefine <macro>
256 C ObjC C++ ObjC++ LTO Var(warn_abi) Warning
257 Warn about things that will change when compiling with an ABI-compliant compiler
260 C ObjC C++ ObjC++ LTO Joined RejectNegative UInteger Warning
261 Warn about things that change between the current -fabi-version and the specified version
264 C++ ObjC++ Var(warn_abi_tag) Warning
265 Warn if a subobject has an abi_tag attribute that the complete object type does not have
268 C ObjC C++ ObjC++ LTO Var(warn_psabi) Init(1) Undocumented LangEnabledBy(C ObjC C++ ObjC++,Wabi)
271 C ObjC C++ ObjC++ Var(warn_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
272 Warn about suspicious uses of memory addresses
275 C ObjC C++ ObjC++ Warning
276 Enable most warning messages
279 LangEnabledBy(C ObjC C++ ObjC++,Wall)
283 ObjC ObjC++ Var(warn_assign_intercept) Warning
284 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
287 C ObjC Var(warn_bad_function_cast) Warning
288 Warn about casting functions to incompatible types
291 C ObjC C++ ObjC++ Var(warn_bool_compare) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
292 Warn about boolean expression compared with an integer value different from true/false
294 Wbuiltin-macro-redefined
295 C ObjC C++ ObjC++ CPP(warn_builtin_macro_redefined) CppReason(CPP_W_BUILTIN_MACRO_REDEFINED) Var(cpp_warn_builtin_macro_redefined) Init(1) Warning
296 Warn when a built-in preprocessor macro is undefined or redefined
299 C ObjC CPP(cpp_warn_c90_c99_compat) CppReason(CPP_W_C90_C99_COMPAT) Var(warn_c90_c99_compat) Init(-1) Warning
300 Warn about features not present in ISO C90, but present in ISO C99
303 C ObjC Var(warn_c99_c11_compat) Init(-1) Warning
304 Warn about features not present in ISO C99, but present in ISO C11
307 C ObjC Var(warn_cxx_compat) CPP(warn_cxx_operator_names) CppReason(CPP_W_CXX_OPERATOR_NAMES) Init(0) Warning
308 Warn about C constructs that are not in the common subset of C and C++
311 C++ ObjC++ Var(warn_cxx0x_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
312 Deprecated in favor of -Wc++11-compat
315 C++ ObjC++ Warning Alias(Wc++0x-compat)
316 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011
319 C++ ObjC++ Var(warn_cxx14_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
320 Warn about C++ constructs whose meaning differs between ISO C++ 2011 and ISO C++ 2014
323 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
324 Warn about casts which discard qualifiers
327 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
328 Warn about subscripts whose type is \"char\"
331 C ObjC C++ ObjC++ Var(warn_chkp) Warning EnabledBy(Wall)
332 Warn about memory access errors found by Pointer Bounds Checker
335 C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
336 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
339 C ObjC C++ ObjC++ CPP(warn_comments) CppReason(CPP_W_COMMENTS) Var(cpp_warn_comment) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
340 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
343 C ObjC C++ ObjC++ Warning Alias(Wcomment)
344 Synonym for -Wcomment
346 Wconditionally-supported
347 C++ ObjC++ Var(warn_conditionally_supported) Warning
348 Warn for conditionally-supported constructs
351 C ObjC C++ ObjC++ Var(warn_conversion) Warning
352 Warn for implicit type conversions that may change a value
355 C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
356 Warn for converting NULL from/to a non-pointer type
359 C ObjC C++ ObjC++ CppReason(CPP_W_WARNING_DIRECTIVE)
360 ; Documented in common.opt
363 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
364 Warn when all constructors and destructors are private
367 C ObjC C++ ObjC++ CPP(warn_date_time) CppReason(CPP_W_DATE_TIME) Var(cpp_warn_date_time) Init(0) Warning
368 Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage
370 Wdeclaration-after-statement
371 C ObjC Var(warn_declaration_after_statement) Init(-1) Warning
372 Warn when a declaration is found after a statement
375 C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
376 Warn when deleting a pointer to incomplete type
378 Wdelete-non-virtual-dtor
379 C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall || Weffc++)
380 Warn about deleting polymorphic objects with non-virtual destructors
383 C C++ ObjC ObjC++ CPP(cpp_warn_deprecated) CppReason(CPP_W_DEPRECATED) Var(warn_deprecated) Init(1) Warning
384 Warn if a deprecated compiler feature, class, method, or field is used
387 C ObjC Var(warn_designated_init) Init(1) Warning
388 Warn about positional initialization of structs requiring designated initializers
390 Wdiscarded-array-qualifiers
391 C ObjC Var(warn_discarded_array_qualifiers) Init(1) Warning
392 Warn if qualifiers on arrays which are pointer targets are discarded
394 Wdiscarded-qualifiers
395 C ObjC Var(warn_discarded_qualifiers) Init(1) Warning
396 Warn if type qualifiers on pointers are discarded
399 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
400 Warn about compile-time integer division by zero
403 C++ ObjC++ Var(warn_ecpp) Warning
404 Warn about violations of Effective C++ style rules
407 C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
408 Warn about an empty body in an if or else statement
411 C ObjC C++ ObjC++ CPP(warn_endif_labels) CppReason(CPP_W_ENDIF_LABELS) Var(cpp_warn_endif_labels) Init(1) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
412 Warn about stray tokens after #elif and #endif
415 C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall || Wc++-compat)
416 Warn about comparison of different enum types
420 ; Documented in common.opt
422 Werror-implicit-function-declaration
423 C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
424 This switch is deprecated; use -Werror=implicit-function-declaration instead
427 C ObjC C++ ObjC++ Var(warn_float_conversion) LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
428 Warn for implicit type conversions that cause loss of floating point precision
431 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
432 Warn if testing floating point numbers for equality
435 C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
436 Warn about printf/scanf/strftime/strfmon format string anomalies
439 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
440 Warn about format strings that contain NUL bytes
443 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
444 Warn if passing too many arguments to a function for its format string
447 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
448 Warn about format strings that are not literals
451 C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
452 Warn about possible security problems with format functions
455 C ObjC C++ ObjC++ Var(warn_format_signedness) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
456 Warn about sign differences with format functions
459 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
460 Warn about strftime formats yielding 2-digit years
463 C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
464 Warn about zero-length formats
467 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
468 Warn about printf/scanf/strftime/strfmon format string anomalies
471 C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
472 Warn whenever type qualifiers are ignored.
474 Wincompatible-pointer-types
475 C ObjC Var(warn_incompatible_pointer_types) Init(1) Warning
476 Warn when there is a conversion between pointers that have incompatible types
479 C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
480 Warn about variables which are initialized to themselves
483 C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
484 Warn about implicit declarations
487 C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
488 Warn about implicit conversions from \"float\" to \"double\"
490 Wimplicit-function-declaration
491 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
492 Warn about implicit function declarations
495 C ObjC Var(warn_implicit_int) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
496 Warn when a declaration does not specify a type
499 C ObjC C++ ObjC++ Undocumented Ignore
501 Winherited-variadic-ctor
502 C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
503 Warn about C++11 inheriting constructors when the base has a variadic constructor
506 C ObjC Var(warn_int_conversion) Init(1) Warning
507 Warn about incompatible integer to pointer and pointer to integer conversions
510 C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
511 Warn when there is a cast to a pointer from an integer of a different size
514 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
515 Warn about invalid uses of the \"offsetof\" macro
518 C ObjC C++ ObjC++ CPP(warn_invalid_pch) CppReason(CPP_W_INVALID_PCH) Var(cpp_warn_invalid_pch) Init(0) Warning
519 Warn about PCH files that are found but not used
522 C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
523 Warn when a jump misses a variable initialization
526 C++ ObjC++ CPP(warn_literal_suffix) CppReason(CPP_W_LITERAL_SUFFIX) Var(cpp_warn_literal_suffix) Init(1) Warning
527 Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.
530 C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
531 Warn when a logical operator is suspiciously always evaluating to true or false
533 Wlogical-not-parentheses
534 C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
535 Warn when logical not is used on the left hand side operand of a comparison
538 C ObjC C++ ObjC++ CPP(cpp_warn_long_long) CppReason(CPP_W_LONG_LONG) Var(warn_long_long) Init(-1) Warning LangEnabledBy(C ObjC,Wc90-c99-compat)
539 Do not warn about using \"long long\" when -pedantic
542 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
543 Warn about suspicious declarations of \"main\"
546 LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
549 Wmemset-transposed-args
550 C ObjC C++ ObjC++ Var(warn_memset_transposed_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
551 Warn about suspicious calls to memset where the third argument is constant literal zero and the second is not
554 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
555 Warn about possibly missing braces around initializers
557 Wmissing-declarations
558 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
559 Warn about global functions without previous declarations
561 Wmissing-field-initializers
562 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
563 Warn about missing fields in struct initializers
566 C++ ObjC++ Var(warn_sized_deallocation) Warning EnabledBy(Wextra)
567 Warn about missing sized deallocation functions
569 Wsizeof-pointer-memaccess
570 C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
571 Warn about suspicious length parameters to certain string functions if the argument uses sizeof
573 Wsizeof-array-argument
574 C ObjC C++ ObjC++ Var(warn_sizeof_array_argument) Warning Init(1)
575 Warn when sizeof is applied on a parameter declared as an array
577 Wsuggest-attribute=format
578 C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
579 Warn about functions which might be candidates for format attributes
582 C++ ObjC++ Var(warn_override) Warning
583 Suggest that the override keyword be used when the declaration of a virtual
584 function overrides another.
587 C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
588 Warn about enumerated switches, with no default, missing a case
591 C ObjC C++ ObjC++ Var(warn_switch_default) Warning
592 Warn about enumerated switches missing a \"default:\" statement
595 C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
596 Warn about all enumerated switches missing a specific case
599 C ObjC C++ ObjC++ Var(warn_switch_bool) Warning Init(1)
600 Warn about switches with boolean controlling expression
602 Wmissing-format-attribute
603 C ObjC C++ ObjC++ Alias(Wsuggest-attribute=format)
606 Wmissing-include-dirs
607 C ObjC C++ ObjC++ CPP(warn_missing_include_dirs) CppReason(CPP_W_MISSING_INCLUDE_DIRS) Var(cpp_warn_missing_include_dirs) Init(0) Warning
608 Warn about user-specified include directories that do not exist
610 Wmissing-parameter-type
611 C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
612 Warn about function parameters declared without a type specifier in K&R-style functions
615 C ObjC Var(warn_missing_prototypes) Warning
616 Warn about global functions without prototypes
619 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
622 C ObjC C++ ObjC++ CPP(warn_multichar) CppReason(CPP_W_MULTICHAR) Var(cpp_warn_multichar) Init(0) Warning
623 Warn about use of multi-character character constants
626 C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall || Wc++0x-compat)
627 Warn about narrowing conversions within { } that are ill-formed in C++11
630 C ObjC Var(warn_nested_externs) Warning
631 Warn about \"extern\" declarations not at file scope
634 C++ ObjC++ Var(warn_noexcept) Warning
635 Warn when a noexcept expression evaluates to false even though the expression can't actually throw
638 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
639 Warn when non-templatized friend functions are declared within a template
642 C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
643 Warn about non-virtual destructors
646 C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
647 Warn about NULL being passed to argument slots marked as requiring non-NULL
650 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
654 C ObjC C++ ObjC++ Alias(Wnormalized=,nfc,none)
658 C ObjC C++ ObjC++ RejectNegative Joined Warning CPP(warn_normalize) CppReason(CPP_W_NORMALIZE) Init(normalized_C) Var(cpp_warn_normalize) Enum(cpp_normalize_level)
659 -Wnormalized=<none|id|nfc|nfkc> Warn about non-normalised Unicode strings
661 ; Required for these enum values.
666 Name(cpp_normalize_level) Type(int) UnknownError(argument %qs to %<-Wnormalized%> not recognized)
669 Enum(cpp_normalize_level) String(none) Value(normalized_none)
672 Enum(cpp_normalize_level) String(nfkc) Value(normalized_KC)
675 Enum(cpp_normalize_level) String(id) Value(normalized_identifier_C)
678 Enum(cpp_normalize_level) String(nfc) Value(normalized_C)
681 C++ ObjC++ Var(warn_old_style_cast) Warning
682 Warn if a C-style cast is used in a program
684 Wold-style-declaration
685 C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
686 Warn for obsolescent usage in a declaration
688 Wold-style-definition
689 C ObjC Var(warn_old_style_definition) Warning
690 Warn if an old-style parameter definition is used
693 C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
694 Warn if a simd directive is overridden by the vectorizer cost model
697 C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
698 Warn if a string is longer than the maximum portable length specified by the standard
701 C++ ObjC++ Var(warn_overloaded_virtual) Warning
702 Warn about overloaded virtual function names
705 C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
706 Warn about overriding initializers without side effects
708 Wpacked-bitfield-compat
709 C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
710 Warn about packed bit-fields whose offset changed in GCC 4.4
713 C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
714 Warn about possibly missing parentheses
717 C ObjC C++ ObjC++ CPP(cpp_pedantic) CppReason(CPP_W_PEDANTIC) Warning
718 ; Documented in common.opt
721 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
722 Warn when converting the type of pointers to member functions
725 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
726 Warn about function pointer arithmetic
729 C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall || Wpedantic)
730 Warn when a pointer differs in signedness in an assignment
733 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
734 Warn when a pointer is cast to an integer of a different size
737 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
738 Warn about misuses of pragmas
740 Wproperty-assign-default
741 ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
742 Warn if a property for an Objective-C object has no assign semantics specified
745 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
746 Warn if inherited methods are unimplemented
749 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
750 Warn about multiple declarations of the same object
753 C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
754 Warn when the compiler reorders code
757 C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
758 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
761 ObjC ObjC++ Var(warn_selector) Warning
762 Warn if a selector has multiple methods
765 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
766 Warn about possible violations of sequence point rules
769 ObjC ObjC++ Var(warn_shadow_ivar) EnabledBy(Wshadow) Init(1) Warning
770 Warn if a local declaration hides an instance variable
772 Wshift-count-negative
773 C ObjC C++ ObjC++ Var(warn_shift_count_negative) Init(1) Warning
774 Warn if shift count is negative
776 Wshift-count-overflow
777 C ObjC C++ ObjC++ Var(warn_shift_count_overflow) Init(1) Warning
778 Warn if shift count >= width of type
781 C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
782 Warn about signed-unsigned comparisons
785 C ObjC C++ ObjC++ EnabledBy(Wextra)
789 C ObjC C++ ObjC++ Var(warn_sign_conversion) LangEnabledBy(C ObjC,Wconversion)
790 Warn for implicit type conversions between signed and unsigned integers
793 C++ ObjC++ Var(warn_sign_promo) Warning
794 Warn when overload promotes from unsigned to signed
796 Wstrict-null-sentinel
797 C++ ObjC++ Warning Var(warn_strict_null_sentinel)
798 Warn about uncasted NULL used as sentinel
801 C ObjC Var(warn_strict_prototypes) Warning
802 Warn about unprototyped function declarations
805 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0)
809 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
812 Wstrict-selector-match
813 ObjC ObjC++ Var(warn_strict_selector_match) Warning
814 Warn if type signatures of candidate methods do not match exactly
817 C C++ Var(warn_sync_nand) Init(1) Warning
818 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
821 C++ ObjC++ Var(warn_synth) Warning
822 Deprecated. This switch has no effect
825 C ObjC C++ ObjC++ Warning
826 ; Documented in common.opt
829 C ObjC CPP(cpp_warn_traditional) CppReason(CPP_W_TRADITIONAL) Var(warn_traditional) Init(0) Warning
830 Warn about features not present in traditional C
832 Wtraditional-conversion
833 C ObjC Var(warn_traditional_conversion) Warning
834 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
837 C ObjC C++ ObjC++ CPP(warn_trigraphs) CppReason(CPP_W_TRIGRAPHS) Var(cpp_warn_trigraphs) Init(2) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
838 Warn if trigraphs are encountered that might affect the meaning of the program
841 ObjC ObjC++ Var(warn_undeclared_selector) Warning
842 Warn about @selector()s without previously declared methods
845 C ObjC C++ ObjC++ CPP(warn_undef) CppReason(CPP_W_UNDEF) Var(cpp_warn_undef) Init(0) Warning
846 Warn if an undefined macro is used in an #if directive
849 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
853 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
857 C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
858 Warn about unrecognized pragmas
860 Wunsuffixed-float-constants
861 C ObjC Var(warn_unsuffixed_float_constants) Warning
862 Warn about unsuffixed float constants
865 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
866 ; documented in common.opt
868 Wunused-local-typedefs
869 C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
870 Warn when typedefs locally defined in a function are not used
873 C ObjC C++ ObjC++ CppReason(CPP_W_UNUSED_MACROS) Var(cpp_warn_unused_macros) Warning
874 Warn about macros defined in the main file that are not used
877 C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
878 Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value
881 C ObjC C++ ObjC++ CPP(warn_variadic_macros) CppReason(CPP_W_VARIADIC_MACROS) Var(cpp_warn_variadic_macros) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic || Wtraditional)
882 Warn about using variadic macros
885 C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
886 Warn about questionable usage of the macros used to retrieve variable arguments
889 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
890 Warn if a variable length array is used
892 Wvolatile-register-var
893 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
894 Warn when a register variable is declared volatile
897 C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
898 Warn if a virtual base has a non-trivial move assignment operator
901 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
902 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.
904 Wzero-as-null-pointer-constant
905 C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
906 Warn when a literal '0' is used as null pointer
909 C++ ObjC++ Var(warn_useless_cast) Warning
910 Warn about useless casts
914 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
917 C ObjC C++ ObjC++ Joined
918 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
921 C++ ObjC++ Joined RejectNegative UInteger Var(flag_abi_compat_version) Init(-1)
922 The version of the C++ ABI used for -Wabi warnings and link compatibility aliases
925 C++ ObjC++ Var(flag_access_control) Init(1)
926 Enforce class member access control semantics
929 C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
930 -fada-spec-parent=unit Dump Ada specs as child units of given parent
933 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
935 fallow-parameterless-variadic-functions
936 C ObjC Var(flag_allow_parameterless_variadic_functions)
937 Allow variadic functions without named parameter
939 falt-external-templates
940 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
944 C ObjC C++ ObjC++ Var(flag_no_asm, 0)
945 Recognize the \"asm\" keyword
947 ; Define extra predefined macros for use in libgcc.
949 C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)
952 C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
953 Recognize built-in functions
956 C ObjC C++ ObjC++ Joined
958 fcanonical-system-headers
960 Where shorter, use canonicalized paths to systems headers.
962 fcheck-pointer-bounds
963 Common Report Var(flag_check_pointer_bounds)
964 Add Pointer Bounds Checker instrumentation. fchkp-* flags are used to
965 control instrumentation. Currently available for C, C++ and ObjC.
967 fchkp-check-incomplete-type
968 C ObjC C++ ObjC++ Report Var(flag_chkp_incomplete_type) Init(1)
969 Generate pointer bounds checks for variables with incomplete type
971 fchkp-zero-input-bounds-for-main
972 C ObjC C++ ObjC++ Report Var(flag_chkp_zero_input_bounds_for_main) Init(0)
973 Use zero bounds for all incoming arguments in 'main' function. It helps when
974 instrumented binaries are used with legacy libs.
976 fchkp-first-field-has-own-bounds
977 C ObjC C++ ObjC++ RejectNegative Report Var(flag_chkp_first_field_has_own_bounds)
978 Forces Pointer Bounds Checker to use narrowed bounds for address of the first
979 field in the structure. By default pointer to the first field has the same
980 bounds as pointer to the whole structure.
983 C ObjC C++ ObjC++ Report Var(flag_chkp_narrow_bounds) Init(1)
984 Control how Pointer Bounds Checker handle pointers to object fields. When
985 narrowing is on, field bounds are used. Otherwise full object bounds are used.
987 fchkp-narrow-to-innermost-array
988 C ObjC C++ ObjC++ RejectNegative Report Var(flag_chkp_narrow_to_innermost_arrray)
989 Forces Pointer Bounds Checker to use bounds of the innermost arrays in case of
990 nested static arryas access. By default outermost array is used.
993 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_optimize) Init(-1)
994 Allow Pointer Bounds Checker optimizations. By default allowed
995 on optimization levels >0.
997 fchkp-use-fast-string-functions
998 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_fast_string_functions) Init(0)
999 Allow to use *_nobnd versions of string functions by Pointer Bounds Checker.
1001 fchkp-use-nochk-string-functions
1002 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_nochk_string_functions) Init(0)
1003 Allow to use *_nochk versions of string functions by Pointer Bounds Checker.
1005 fchkp-use-static-bounds
1006 C ObjC C++ ObjC++ Report Var(flag_chkp_use_static_bounds) Init(1)
1007 Use statically initialized variable for vars bounds instead of
1008 generating them each time it is required.
1010 fchkp-use-static-const-bounds
1011 C ObjC C++ ObjC++ Report Var(flag_chkp_use_static_const_bounds) Init(-1)
1012 Use statically initialized variable for constant bounds instead of
1013 generating them each time it is required.
1015 fchkp-treat-zero-dynamic-size-as-infinite
1016 C ObjC C++ ObjC++ Report Var(flag_chkp_zero_dynamic_size_as_infinite) Init(0)
1017 With this option zero size obtained dynamically for objects with
1018 incomplete type will be treated as infinite.
1021 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_read) Init(1)
1022 Generate checks for all read accesses to memory.
1025 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_write) Init(1)
1026 Generate checks for all write accesses to memory.
1029 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_store_bounds) Init(1)
1030 Generate bounds stores for pointer writes.
1032 fchkp-instrument-calls
1033 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_calls) Init(1)
1034 Generate bounds passing for calls.
1036 fchkp-instrument-marked-only
1037 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_marked_only) Init(0)
1038 Instrument only functions marked with bnd_instrument attribute.
1041 C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
1046 Allow the arguments of the '?' operator to have different types
1049 C++ ObjC++ Var(flag_conserve_space)
1050 Does nothing. Preserved for backward compatibility.
1052 fconstant-string-class=
1053 ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
1054 -fconst-string-class=<name> Use class <name> for constant strings
1057 C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
1058 -fconstexpr-depth=<number> Specify maximum constexpr recursion depth
1062 Emit debug annotations during preprocessing
1065 C++ ObjC++ Var(flag_deduce_init_list) Init(0)
1066 -fdeduce-init-list enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list
1069 C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
1070 Factor complex constructors and destructors to favor space over speed
1074 Does nothing. Preserved for backward compatibility.
1078 Preprocess directives only.
1080 fdollars-in-identifiers
1082 Permit '$' as an identifier character
1085 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
1086 Write all declarations as Ada code transitively
1089 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
1090 Write all declarations as Ada code for the given file only
1093 C++ ObjC++ Var(flag_elide_constructors) Init(1)
1096 C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
1097 Generate code to check exception specifications
1100 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1103 C ObjC C++ ObjC++ Joined RejectNegative
1104 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
1106 fextended-identifiers
1108 Permit universal character names (\\u and \\U) in identifiers
1111 C ObjC C++ ObjC++ Joined RejectNegative
1112 -finput-charset=<cset> Specify the default character set for source files
1115 C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
1116 Support dynamic initialization of thread-local variables in a different translation unit
1119 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1122 C++ ObjC++ Var(flag_new_for_scope) Init(1)
1123 Scope of for-init-statement variables is local to the loop
1127 Do not assume that standard C libraries and \"main\" exist
1130 C++ ObjC++ Var(flag_no_gnu_keywords, 0)
1131 Recognize GNU-defined keywords
1134 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
1135 Generate code for GNU runtime environment
1138 C ObjC Var(flag_gnu89_inline) Init(-1)
1139 Use traditional GNU semantics for inline functions
1142 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1145 C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})
1148 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1152 Assume normal C execution environment
1155 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1159 C++ ObjC++ Var(flag_implement_inlines) Init(1)
1160 Export functions even if they can be inlined
1162 fimplicit-inline-templates
1163 C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
1164 Emit implicit instantiations of inline templates
1167 C++ ObjC++ Var(flag_implicit_templates) Init(1)
1168 Emit implicit instantiations of templates
1171 C++ ObjC++ Var(flag_friend_injection)
1172 Inject friend functions into enclosing namespace
1174 fkeep-inline-dllexport
1175 C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
1176 Don't emit dllexported inline functions unless needed
1179 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1181 flax-vector-conversions
1182 C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
1183 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
1186 C ObjC C++ ObjC++ Var(flag_ms_extensions)
1187 Don't warn about uses of Microsoft extensions
1190 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1193 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1196 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1198 fname-mangling-version-
1199 C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)
1202 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1205 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime)
1206 Generate code for NeXT (Apple Mac OS X) runtime environment
1209 ObjC ObjC++ Var(flag_nil_receivers) Init(1)
1210 Assume that receivers of Objective-C messages may be nil
1213 ObjC ObjC++ Var(flag_local_ivars) Init(1)
1214 Allow access to instance variables as if they were local declarations within instance method implementations.
1217 ObjC ObjC++ Joined RejectNegative Enum(ivar_visibility) Var(default_ivar_visibility) Init(IVAR_VISIBILITY_PROTECTED)
1218 -fvisibility=[private|protected|public|package] Set the default symbol visibility
1221 Name(ivar_visibility) Type(enum ivar_visibility) UnknownError(unrecognized ivar visibility value %qs)
1224 Enum(ivar_visibility) String(private) Value(IVAR_VISIBILITY_PRIVATE)
1227 Enum(ivar_visibility) String(protected) Value(IVAR_VISIBILITY_PROTECTED)
1230 Enum(ivar_visibility) String(public) Value(IVAR_VISIBILITY_PUBLIC)
1233 Enum(ivar_visibility) String(package) Value(IVAR_VISIBILITY_PACKAGE)
1236 C++ ObjC++ Var(flag_no_nonansi_builtin, 0)
1239 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1242 C++ ObjC++ Optimization Var(flag_nothrow_opt)
1243 Treat a throw() exception specification as noexcept to improve code size
1246 ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi)
1247 Specify which ABI to use for Objective-C family code and meta-data generation.
1249 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
1250 ; to initialize any non-POD ivars in Objective-C++ classes.
1251 fobjc-call-cxx-cdtors
1252 ObjC++ Var(flag_objc_call_cxx_cdtors)
1253 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
1255 fobjc-direct-dispatch
1256 ObjC ObjC++ Var(flag_objc_direct_dispatch)
1257 Allow fast jumps to the message dispatcher
1259 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
1260 ; @try, etc.) in source code.
1262 ObjC ObjC++ Var(flag_objc_exceptions)
1263 Enable Objective-C exception and synchronization syntax
1266 ObjC ObjC++ LTO Var(flag_objc_gc)
1267 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
1270 ObjC ObjC++ Var(flag_objc_nilcheck,1)
1271 Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.
1273 ; Nonzero means that we generate NeXT setjmp based exceptions.
1274 fobjc-sjlj-exceptions
1275 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
1276 Enable Objective-C setjmp exception handling runtime
1279 ObjC ObjC++ Var(flag_objc1_only)
1280 Conform to the Objective-C 1.0 language as implemented in GCC 4.0
1283 C ObjC C++ ObjC++ Var(flag_openacc)
1287 C ObjC C++ ObjC++ Var(flag_openmp)
1288 Enable OpenMP (implies -frecursive in Fortran)
1291 C ObjC C++ ObjC++ Var(flag_openmp_simd)
1292 Enable OpenMP's SIMD directives
1296 Recognize C++ keywords like \"compl\" and \"xor\"
1300 Does nothing. Preserved for backward compatibility.
1307 Look for and use PCH files even when preprocessing
1310 C++ ObjC++ Var(flag_permissive)
1311 Downgrade conformance errors to warnings
1314 C ObjC Var(flag_plan9_extensions)
1315 Enable Plan 9 language extensions
1319 Treat the input file as already preprocessed
1321 ftrack-macro-expansion
1322 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1323 ; converted into ftrack-macro-expansion=
1325 ftrack-macro-expansion=
1326 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1327 -ftrack-macro-expansion=<0|1|2> Track locations of tokens coming from macro expansion and display them in error messages
1330 C++ ObjC++ Var(flag_pretty_templates) Init(1)
1331 -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments
1333 freplace-objc-classes
1334 ObjC ObjC++ LTO Var(flag_replace_objc_classes)
1335 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
1339 Enable automatic template instantiation
1342 C++ ObjC++ Optimization Var(flag_rtti) Init(1)
1343 Generate run time type descriptor information
1346 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_double)
1347 Use the same size for double as for float
1350 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_enums)
1351 Use the narrowest integer type possible for enumeration types
1354 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_wchar)
1355 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
1358 C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
1359 When \"signed\" or \"unsigned\" is not given make the bitfield signed
1362 C ObjC C++ ObjC++ LTO Var(flag_signed_char)
1363 Make \"char\" signed by default
1366 C++ ObjC++ Var(flag_sized_deallocation) Init(-1)
1367 Enable C++14 sized deallocation support
1370 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1373 C++ ObjC++ Var(flag_detailed_statistics)
1374 Display statistics accumulated during compilation
1377 C++ ObjC++ Optimization Var(flag_strict_enums)
1378 Assume that values of enumeration type are always within the minimum range of that type
1381 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1384 C ObjC C++ ObjC++ Joined RejectNegative UInteger
1385 -ftabstop=<number> Distance between tab stops for column reporting
1387 ftemplate-backtrace-limit=
1388 C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
1389 Set the maximum number of template instantiation notes for a single warning or error
1392 C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)
1395 C++ ObjC++ Joined RejectNegative UInteger
1396 -ftemplate-depth=<number> Specify maximum template instantiation depth
1399 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1402 C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
1403 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
1406 C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
1407 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
1410 C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
1411 Make \"char\" unsigned by default
1414 C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
1415 Use __cxa_atexit to register destructors
1417 fuse-cxa-get-exception-ptr
1418 C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
1419 Use __cxa_get_exception_ptr in exception handling
1421 fvisibility-inlines-hidden
1423 Marks all inlined functions and methods as having hidden visibility
1425 fvisibility-ms-compat
1426 C++ ObjC++ Var(flag_visibility_ms_compat)
1427 Changes visibility to match Microsoft Visual Studio by default
1430 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1434 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1438 C++ ObjC++ Var(flag_weak) Init(1)
1439 Emit common-like symbols as weak symbols
1442 C ObjC C++ ObjC++ Joined RejectNegative
1443 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
1446 C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
1447 Generate a #line directive pointing at the current working directory
1450 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1454 ObjC ObjC++ Var(flag_zero_link)
1455 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
1458 ObjC ObjC++ Var(flag_gen_declaration)
1459 Dump declarations to a .decl file
1461 femit-struct-debug-baseonly
1463 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
1465 femit-struct-debug-reduced
1467 -femit-struct-debug-reduced Conservative reduced debug info for structs
1469 femit-struct-debug-detailed=
1470 C ObjC C++ ObjC++ Joined
1471 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
1473 fext-numeric-literals
1475 Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding
1476 number literal rather than a user-defined number literal.
1479 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1480 -idirafter <dir> Add <dir> to the end of the system include path
1483 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1484 -imacros <file> Accept definition of macros in <file>
1487 C ObjC C++ ObjC++ Joined Separate
1488 -imultilib <dir> Set <dir> to be the multilib include subdirectory
1491 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1492 -include <file> Include the contents of <file> before other files
1495 C ObjC C++ ObjC++ Joined Separate
1496 -iprefix <path> Specify <path> as a prefix for next two options
1499 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1500 -isysroot <dir> Set <dir> to be the system root directory
1503 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1504 -isystem <dir> Add <dir> to the start of the system include path
1507 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1508 -iquote <dir> Add <dir> to the end of the quote include path
1511 C ObjC C++ ObjC++ Joined Separate
1512 -iwithprefix <dir> Add <dir> to the end of the system include path
1515 C ObjC C++ ObjC++ Joined Separate
1516 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
1519 C Undocumented RejectDriver
1526 Do not search standard system include directories (those specified with -isystem will still be used)
1530 Do not search standard system include directories for C++
1533 C ObjC C++ ObjC++ Joined Separate
1534 ; Documented in common.opt
1537 C ObjC C++ ObjC++ Alias(Wpedantic)
1538 ; Documented in common.opt
1540 print-objc-runtime-info
1542 Generate C header of platform-specific features
1546 Remap file names when including files
1550 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1553 C++ ObjC++ Alias(std=c++98)
1554 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1558 Conform to the ISO 2011 C++ standard
1561 C++ ObjC++ Alias(std=c++11) Undocumented
1562 Deprecated in favor of -std=c++11
1565 C++ ObjC++ Alias(std=c++14) Undocumented
1566 Deprecated in favor of -std=c++14
1569 C++ ObjC++ Undocumented
1570 Conform to the ISO 2014 C++ standard (experimental and incomplete support)
1574 Conform to the ISO 2017(?) C++ draft standard (experimental and incomplete support)
1577 C++ ObjC++ Alias(std=c++1z) Undocumented
1581 Conform to the ISO 2011 C standard (experimental and incomplete support)
1584 C ObjC Alias(std=c11)
1585 Deprecated in favor of -std=c11
1588 C ObjC Alias(std=c90)
1589 Conform to the ISO 1990 C standard
1593 Conform to the ISO 1990 C standard
1597 Conform to the ISO 1999 C standard
1600 C ObjC Alias(std=c99)
1601 Deprecated in favor of -std=c99
1605 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1606 corrigendum with GNU extensions
1609 C++ ObjC++ Alias(std=gnu++98)
1610 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1611 corrigendum with GNU extensions
1615 Conform to the ISO 2011 C++ standard with GNU extensions (experimental and incomplete support)
1618 C++ ObjC++ Alias(std=gnu++11)
1619 Deprecated in favor of -std=gnu++11
1622 C++ ObjC++ Alias(std=gnu++14) Undocumented
1626 Conform to the ISO 2014 C++ standard with GNU extensions (experimental and incomplete support)
1630 Conform to the ISO 201z(7?) C++ draft standard with GNU extensions (experimental and incomplete support)
1633 C++ ObjC++ Alias(std=gnu++1z) Undocumented
1637 Conform to the ISO 2011 C standard with GNU extensions (experimental and incomplete support)
1640 C ObjC Alias(std=gnu11)
1641 Deprecated in favor of -std=gnu11
1644 C ObjC Alias(std=gnu90)
1645 Conform to the ISO 1990 C standard with GNU extensions
1649 Conform to the ISO 1990 C standard with GNU extensions
1653 Conform to the ISO 1999 C standard with GNU extensions
1656 C ObjC Alias(std=gnu99)
1657 Deprecated in favor of -std=gnu99
1660 C ObjC Alias(std=c90)
1661 Conform to the ISO 1990 C standard
1665 Conform to the ISO 1990 C standard as amended in 1994
1668 C ObjC Alias(std=c99)
1669 Conform to the ISO 1999 C standard
1672 C ObjC Alias(std=c99)
1673 Deprecated in favor of -std=iso9899:1999
1676 C ObjC Alias(std=c11)
1677 Conform to the ISO 2011 C standard (experimental and incomplete support)
1684 Enable traditional preprocessing
1688 -trigraphs Support ISO C trigraphs
1691 C ObjC C++ ObjC++ Var(flag_undef)
1692 Do not predefine system-specific and GCC-specific macros
1696 ; Documented in common.opt
1700 ; Documented in common.opt
1702 ; This comment is to ensure we retain the blank line above.