1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003-2014 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 C++ ObjC++ Var(warn_cast_qual) Warning
320 Warn about casts which discard qualifiers
323 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
324 Warn about subscripts whose type is \"char\"
327 C ObjC C++ ObjC++ Var(warn_chkp) Warning EnabledBy(Wall)
328 Warn about memory access errors found by Pointer Bounds Checker
331 C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
332 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
335 C ObjC C++ ObjC++ CPP(warn_comments) CppReason(CPP_W_COMMENTS) Var(cpp_warn_comment) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
336 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
339 C ObjC C++ ObjC++ Warning Alias(Wcomment)
340 Synonym for -Wcomment
342 Wconditionally-supported
343 C++ ObjC++ Var(warn_conditionally_supported) Warning
344 Warn for conditionally-supported constructs
347 C ObjC C++ ObjC++ Var(warn_conversion) Warning
348 Warn for implicit type conversions that may change a value
351 C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
352 Warn for converting NULL from/to a non-pointer type
355 C ObjC C++ ObjC++ CppReason(CPP_W_WARNING_DIRECTIVE)
356 ; Documented in common.opt
359 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
360 Warn when all constructors and destructors are private
363 C ObjC C++ ObjC++ CPP(warn_date_time) CppReason(CPP_W_DATE_TIME) Var(cpp_warn_date_time) Init(0) Warning
364 Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage
366 Wdeclaration-after-statement
367 C ObjC Var(warn_declaration_after_statement) Init(-1) Warning
368 Warn when a declaration is found after a statement
371 C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
372 Warn when deleting a pointer to incomplete type
374 Wdelete-non-virtual-dtor
375 C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall || Weffc++)
376 Warn about deleting polymorphic objects with non-virtual destructors
379 C C++ ObjC ObjC++ CPP(cpp_warn_deprecated) CppReason(CPP_W_DEPRECATED) Var(warn_deprecated) Init(1) Warning
380 Warn if a deprecated compiler feature, class, method, or field is used
383 C ObjC Var(warn_designated_init) Init(1) Warning
384 Warn about positional initialization of structs requiring designated initializers
386 Wdiscarded-qualifiers
387 C ObjC Var(warn_discarded_qualifiers) Init(1) Warning
388 Warn if type qualifiers on pointers are discarded
391 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
392 Warn about compile-time integer division by zero
395 C++ ObjC++ Var(warn_ecpp) Warning
396 Warn about violations of Effective C++ style rules
399 C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
400 Warn about an empty body in an if or else statement
403 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)
404 Warn about stray tokens after #elif and #endif
407 C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall || Wc++-compat)
408 Warn about comparison of different enum types
412 ; Documented in common.opt
414 Werror-implicit-function-declaration
415 C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
416 This switch is deprecated; use -Werror=implicit-function-declaration instead
419 C ObjC C++ ObjC++ Var(warn_float_conversion) LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
420 Warn for implicit type conversions that cause loss of floating point precision
423 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
424 Warn if testing floating point numbers for equality
427 C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
428 Warn about printf/scanf/strftime/strfmon format string anomalies
431 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
432 Warn about format strings that contain NUL bytes
435 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
436 Warn if passing too many arguments to a function for its format string
439 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
440 Warn about format strings that are not literals
443 C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
444 Warn about possible security problems with format functions
447 C ObjC C++ ObjC++ Var(warn_format_signedness) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
448 Warn about sign differences with format functions
451 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
452 Warn about strftime formats yielding 2-digit years
455 C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
456 Warn about zero-length formats
459 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
460 Warn about printf/scanf/strftime/strfmon format string anomalies
463 C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
464 Warn whenever type qualifiers are ignored.
466 Wincompatible-pointer-types
467 C ObjC Var(warn_incompatible_pointer_types) Init(1) Warning
468 Warn when there is a conversion between pointers that have incompatible types
471 C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
472 Warn about variables which are initialized to themselves
475 C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
476 Warn about implicit declarations
479 C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
480 Warn about implicit conversions from \"float\" to \"double\"
482 Wimplicit-function-declaration
483 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
484 Warn about implicit function declarations
487 C ObjC Var(warn_implicit_int) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
488 Warn when a declaration does not specify a type
491 C ObjC C++ ObjC++ Undocumented Ignore
493 Winherited-variadic-ctor
494 C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
495 Warn about C++11 inheriting constructors when the base has a variadic constructor
498 C ObjC Var(warn_int_conversion) Init(1) Warning
499 Warn about incompatible integer to pointer and pointer to integer conversions
502 C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
503 Warn when there is a cast to a pointer from an integer of a different size
506 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
507 Warn about invalid uses of the \"offsetof\" macro
510 C ObjC C++ ObjC++ CPP(warn_invalid_pch) CppReason(CPP_W_INVALID_PCH) Var(cpp_warn_invalid_pch) Init(0) Warning
511 Warn about PCH files that are found but not used
514 C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
515 Warn when a jump misses a variable initialization
518 C++ ObjC++ CPP(warn_literal_suffix) CppReason(CPP_W_LITERAL_SUFFIX) Var(cpp_warn_literal_suffix) Init(1) Warning
519 Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.
522 C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
523 Warn when a logical operator is suspiciously always evaluating to true or false
525 Wlogical-not-parentheses
526 C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
527 Warn when logical not is used on the left hand side operand of a comparison
530 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)
531 Do not warn about using \"long long\" when -pedantic
534 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
535 Warn about suspicious declarations of \"main\"
538 LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
541 Wmemset-transposed-args
542 C ObjC C++ ObjC++ Var(warn_memset_transposed_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
543 Warn about suspicious calls to memset where the third argument is constant literal zero and the second is not
546 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
547 Warn about possibly missing braces around initializers
549 Wmissing-declarations
550 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
551 Warn about global functions without previous declarations
553 Wmissing-field-initializers
554 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
555 Warn about missing fields in struct initializers
557 Wsizeof-pointer-memaccess
558 C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
559 Warn about suspicious length parameters to certain string functions if the argument uses sizeof
561 Wsizeof-array-argument
562 C ObjC C++ ObjC++ Var(warn_sizeof_array_argument) Warning Init(1)
563 Warn when sizeof is applied on a parameter declared as an array
565 Wsuggest-attribute=format
566 C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
567 Warn about functions which might be candidates for format attributes
570 C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
571 Warn about enumerated switches, with no default, missing a case
574 C ObjC C++ ObjC++ Var(warn_switch_default) Warning
575 Warn about enumerated switches missing a \"default:\" statement
578 C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
579 Warn about all enumerated switches missing a specific case
582 C ObjC C++ ObjC++ Var(warn_switch_bool) Warning Init(1)
583 Warn about switches with boolean controlling expression
585 Wmissing-format-attribute
586 C ObjC C++ ObjC++ Alias(Wsuggest-attribute=format)
589 Wmissing-include-dirs
590 C ObjC C++ ObjC++ CPP(warn_missing_include_dirs) CppReason(CPP_W_MISSING_INCLUDE_DIRS) Var(cpp_warn_missing_include_dirs) Init(0) Warning
591 Warn about user-specified include directories that do not exist
593 Wmissing-parameter-type
594 C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
595 Warn about function parameters declared without a type specifier in K&R-style functions
598 C ObjC Var(warn_missing_prototypes) Warning
599 Warn about global functions without prototypes
602 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
605 C ObjC C++ ObjC++ CPP(warn_multichar) CppReason(CPP_W_MULTICHAR) Var(cpp_warn_multichar) Init(0) Warning
606 Warn about use of multi-character character constants
609 C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall || Wc++0x-compat)
610 Warn about narrowing conversions within { } that are ill-formed in C++11
613 C ObjC Var(warn_nested_externs) Warning
614 Warn about \"extern\" declarations not at file scope
617 C++ ObjC++ Var(warn_noexcept) Warning
618 Warn when a noexcept expression evaluates to false even though the expression can't actually throw
621 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
622 Warn when non-templatized friend functions are declared within a template
625 C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
626 Warn about non-virtual destructors
629 C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
630 Warn about NULL being passed to argument slots marked as requiring non-NULL
633 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
637 C ObjC C++ ObjC++ Alias(Wnormalized=,nfc,none)
641 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)
642 -Wnormalized=<none|id|nfc|nfkc> Warn about non-normalised Unicode strings
644 ; Required for these enum values.
649 Name(cpp_normalize_level) Type(int) UnknownError(argument %qs to %<-Wnormalized%> not recognized)
652 Enum(cpp_normalize_level) String(none) Value(normalized_none)
655 Enum(cpp_normalize_level) String(nfkc) Value(normalized_KC)
658 Enum(cpp_normalize_level) String(id) Value(normalized_identifier_C)
661 Enum(cpp_normalize_level) String(nfc) Value(normalized_C)
664 C++ ObjC++ Var(warn_old_style_cast) Warning
665 Warn if a C-style cast is used in a program
667 Wold-style-declaration
668 C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
669 Warn for obsolescent usage in a declaration
671 Wold-style-definition
672 C ObjC Var(warn_old_style_definition) Warning
673 Warn if an old-style parameter definition is used
676 C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
677 Warn if a simd directive is overridden by the vectorizer cost model
680 C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
681 Warn if a string is longer than the maximum portable length specified by the standard
684 C++ ObjC++ Var(warn_overloaded_virtual) Warning
685 Warn about overloaded virtual function names
688 C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
689 Warn about overriding initializers without side effects
691 Wpacked-bitfield-compat
692 C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
693 Warn about packed bit-fields whose offset changed in GCC 4.4
696 C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
697 Warn about possibly missing parentheses
700 C ObjC C++ ObjC++ CPP(cpp_pedantic) CppReason(CPP_W_PEDANTIC) Warning
701 ; Documented in common.opt
704 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
705 Warn when converting the type of pointers to member functions
708 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
709 Warn about function pointer arithmetic
712 C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall || Wpedantic)
713 Warn when a pointer differs in signedness in an assignment
716 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
717 Warn when a pointer is cast to an integer of a different size
720 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
721 Warn about misuses of pragmas
723 Wproperty-assign-default
724 ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
725 Warn if a property for an Objective-C object has no assign semantics specified
728 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
729 Warn if inherited methods are unimplemented
732 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
733 Warn about multiple declarations of the same object
736 C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
737 Warn when the compiler reorders code
740 C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
741 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
744 ObjC ObjC++ Var(warn_selector) Warning
745 Warn if a selector has multiple methods
748 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
749 Warn about possible violations of sequence point rules
752 ObjC ObjC++ Var(warn_shadow_ivar) EnabledBy(Wshadow) Init(1) Warning
753 Warn if a local declaration hides an instance variable
755 Wshift-count-negative
756 C ObjC C++ ObjC++ Var(warn_shift_count_negative) Init(1) Warning
757 Warn if shift count is negative
759 Wshift-count-overflow
760 C ObjC C++ ObjC++ Var(warn_shift_count_overflow) Init(1) Warning
761 Warn if shift count >= width of type
764 C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
765 Warn about signed-unsigned comparisons
768 C ObjC C++ ObjC++ EnabledBy(Wextra)
772 C ObjC C++ ObjC++ Var(warn_sign_conversion) LangEnabledBy(C ObjC,Wconversion)
773 Warn for implicit type conversions between signed and unsigned integers
776 C++ ObjC++ Var(warn_sign_promo) Warning
777 Warn when overload promotes from unsigned to signed
779 Wstrict-null-sentinel
780 C++ ObjC++ Warning Var(warn_strict_null_sentinel)
781 Warn about uncasted NULL used as sentinel
784 C ObjC Var(warn_strict_prototypes) Warning
785 Warn about unprototyped function declarations
788 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0)
792 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
795 Wstrict-selector-match
796 ObjC ObjC++ Var(warn_strict_selector_match) Warning
797 Warn if type signatures of candidate methods do not match exactly
800 C C++ Var(warn_sync_nand) Init(1) Warning
801 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
804 C++ ObjC++ Var(warn_synth) Warning
805 Deprecated. This switch has no effect
808 C ObjC C++ ObjC++ Warning
809 ; Documented in common.opt
812 C ObjC CPP(cpp_warn_traditional) CppReason(CPP_W_TRADITIONAL) Var(warn_traditional) Init(0) Warning
813 Warn about features not present in traditional C
815 Wtraditional-conversion
816 C ObjC Var(warn_traditional_conversion) Warning
817 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
820 C ObjC C++ ObjC++ CPP(warn_trigraphs) CppReason(CPP_W_TRIGRAPHS) Var(cpp_warn_trigraphs) Init(2) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
821 Warn if trigraphs are encountered that might affect the meaning of the program
824 ObjC ObjC++ Var(warn_undeclared_selector) Warning
825 Warn about @selector()s without previously declared methods
828 C ObjC C++ ObjC++ CPP(warn_undef) CppReason(CPP_W_UNDEF) Var(cpp_warn_undef) Init(0) Warning
829 Warn if an undefined macro is used in an #if directive
832 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
836 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
840 C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
841 Warn about unrecognized pragmas
843 Wunsuffixed-float-constants
844 C ObjC Var(warn_unsuffixed_float_constants) Warning
845 Warn about unsuffixed float constants
848 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
849 ; documented in common.opt
851 Wunused-local-typedefs
852 C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
853 Warn when typedefs locally defined in a function are not used
856 C ObjC C++ ObjC++ CppReason(CPP_W_UNUSED_MACROS) Var(cpp_warn_unused_macros) Warning
857 Warn about macros defined in the main file that are not used
860 C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
861 Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value
864 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)
865 Warn about using variadic macros
868 C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
869 Warn about questionable usage of the macros used to retrieve variable arguments
872 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
873 Warn if a variable length array is used
875 Wvolatile-register-var
876 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
877 Warn when a register variable is declared volatile
880 C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
881 Warn if a virtual base has a non-trivial move assignment operator
884 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
885 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.
887 Wzero-as-null-pointer-constant
888 C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
889 Warn when a literal '0' is used as null pointer
892 C++ ObjC++ Var(warn_useless_cast) Warning
893 Warn about useless casts
897 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
900 C ObjC C++ ObjC++ Joined
901 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
904 C++ ObjC++ Joined RejectNegative UInteger Var(flag_abi_compat_version) Init(-1)
905 The version of the C++ ABI used for -Wabi warnings and link compatibility aliases
908 C++ ObjC++ Var(flag_access_control) Init(1)
909 Enforce class member access control semantics
912 C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
913 -fada-spec-parent=unit Dump Ada specs as child units of given parent
916 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
918 fallow-parameterless-variadic-functions
919 C ObjC Var(flag_allow_parameterless_variadic_functions)
920 Allow variadic functions without named parameter
922 falt-external-templates
923 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
927 C ObjC C++ ObjC++ Var(flag_no_asm, 0)
928 Recognize the \"asm\" keyword
930 ; Define extra predefined macros for use in libgcc.
932 C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)
935 C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
936 Recognize built-in functions
939 C ObjC C++ ObjC++ Joined
941 fcanonical-system-headers
943 Where shorter, use canonicalized paths to systems headers.
945 fcheck-pointer-bounds
946 Common Report Var(flag_check_pointer_bounds)
947 Add Pointer Bounds Checker instrumentation. fchkp-* flags are used to
948 control instrumentation. Currently available for C, C++ and ObjC.
950 fchkp-check-incomplete-type
951 C ObjC C++ ObjC++ Report Var(flag_chkp_incomplete_type) Init(1)
952 Generate pointer bounds checks for variables with incomplete type
954 fchkp-zero-input-bounds-for-main
955 C ObjC C++ ObjC++ Report Var(flag_chkp_zero_input_bounds_for_main) Init(0)
956 Use zero bounds for all incoming arguments in 'main' function. It helps when
957 instrumented binaries are used with legacy libs.
959 fchkp-first-field-has-own-bounds
960 C ObjC C++ ObjC++ RejectNegative Report Var(flag_chkp_first_field_has_own_bounds)
961 Forces Pointer Bounds Checker to use narrowed bounds for address of the first
962 field in the structure. By default pointer to the first field has the same
963 bounds as pointer to the whole structure.
966 C ObjC C++ ObjC++ Report Var(flag_chkp_narrow_bounds) Init(1)
967 Control how Pointer Bounds Checker handle pointers to object fields. When
968 narrowing is on, field bounds are used. Otherwise full object bounds are used.
970 fchkp-narrow-to-innermost-array
971 C ObjC C++ ObjC++ RejectNegative Report Var(flag_chkp_narrow_to_innermost_arrray)
972 Forces Pointer Bounds Checker to use bounds of the innermost arrays in case of
973 nested static arryas access. By default outermost array is used.
976 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_optimize) Init(-1)
977 Allow Pointer Bounds Checker optimizations. By default allowed
978 on optimization levels >0.
980 fchkp-use-fast-string-functions
981 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_fast_string_functions) Init(0)
982 Allow to use *_nobnd versions of string functions by Pointer Bounds Checker.
984 fchkp-use-nochk-string-functions
985 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_nochk_string_functions) Init(0)
986 Allow to use *_nochk versions of string functions by Pointer Bounds Checker.
988 fchkp-use-static-bounds
989 C ObjC C++ ObjC++ Report Var(flag_chkp_use_static_bounds) Init(1)
990 Use statically initialized variable for vars bounds instead of
991 generating them each time it is required.
993 fchkp-use-static-const-bounds
994 C ObjC C++ ObjC++ Report Var(flag_chkp_use_static_const_bounds) Init(-1)
995 Use statically initialized variable for constant bounds instead of
996 generating them each time it is required.
998 fchkp-treat-zero-dynamic-size-as-infinite
999 C ObjC C++ ObjC++ Report Var(flag_chkp_zero_dynamic_size_as_infinite) Init(0)
1000 With this option zero size obtained dynamically for objects with
1001 incomplete type will be treated as infinite.
1004 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_read) Init(1)
1005 Generate checks for all read accesses to memory.
1008 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_write) Init(1)
1009 Generate checks for all write accesses to memory.
1012 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_store_bounds) Init(1)
1013 Generate bounds stores for pointer writes.
1015 fchkp-instrument-calls
1016 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_calls) Init(1)
1017 Generate bounds passing for calls.
1019 fchkp-instrument-marked-only
1020 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_marked_only) Init(0)
1021 Instrument only functions marked with bnd_instrument attribute.
1024 C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
1029 Allow the arguments of the '?' operator to have different types
1032 C++ ObjC++ Var(flag_conserve_space)
1033 Does nothing. Preserved for backward compatibility.
1035 fconstant-string-class=
1036 ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
1037 -fconst-string-class=<name> Use class <name> for constant strings
1040 C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
1041 -fconstexpr-depth=<number> Specify maximum constexpr recursion depth
1045 Emit debug annotations during preprocessing
1048 C++ ObjC++ Var(flag_deduce_init_list) Init(0)
1049 -fdeduce-init-list enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list
1052 C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
1053 Factor complex constructors and destructors to favor space over speed
1057 Does nothing. Preserved for backward compatibility.
1061 Preprocess directives only.
1063 fdollars-in-identifiers
1065 Permit '$' as an identifier character
1068 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
1069 Write all declarations as Ada code transitively
1072 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
1073 Write all declarations as Ada code for the given file only
1076 C++ ObjC++ Var(flag_elide_constructors) Init(1)
1079 C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
1080 Generate code to check exception specifications
1083 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1086 C ObjC C++ ObjC++ Joined RejectNegative
1087 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
1089 fextended-identifiers
1091 Permit universal character names (\\u and \\U) in identifiers
1094 C ObjC C++ ObjC++ Joined RejectNegative
1095 -finput-charset=<cset> Specify the default character set for source files
1098 C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
1099 Support dynamic initialization of thread-local variables in a different translation unit
1102 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1105 C++ ObjC++ Var(flag_new_for_scope) Init(1)
1106 Scope of for-init-statement variables is local to the loop
1110 Do not assume that standard C libraries and \"main\" exist
1113 C++ ObjC++ Var(flag_no_gnu_keywords, 0)
1114 Recognize GNU-defined keywords
1117 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
1118 Generate code for GNU runtime environment
1121 C ObjC Var(flag_gnu89_inline) Init(-1)
1122 Use traditional GNU semantics for inline functions
1125 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1128 C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})
1131 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1135 Assume normal C execution environment
1138 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1142 C++ ObjC++ Var(flag_implement_inlines) Init(1)
1143 Export functions even if they can be inlined
1145 fimplicit-inline-templates
1146 C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
1147 Emit implicit instantiations of inline templates
1150 C++ ObjC++ Var(flag_implicit_templates) Init(1)
1151 Emit implicit instantiations of templates
1154 C++ ObjC++ Var(flag_friend_injection)
1155 Inject friend functions into enclosing namespace
1157 fkeep-inline-dllexport
1158 C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
1159 Don't emit dllexported inline functions unless needed
1162 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1164 flax-vector-conversions
1165 C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
1166 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
1169 C ObjC C++ ObjC++ Var(flag_ms_extensions)
1170 Don't warn about uses of Microsoft extensions
1173 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1176 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1179 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1181 fname-mangling-version-
1182 C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)
1185 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1188 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime)
1189 Generate code for NeXT (Apple Mac OS X) runtime environment
1192 ObjC ObjC++ Var(flag_nil_receivers) Init(1)
1193 Assume that receivers of Objective-C messages may be nil
1196 ObjC ObjC++ Var(flag_local_ivars) Init(1)
1197 Allow access to instance variables as if they were local declarations within instance method implementations.
1200 ObjC ObjC++ Joined RejectNegative Enum(ivar_visibility) Var(default_ivar_visibility) Init(IVAR_VISIBILITY_PROTECTED)
1201 -fvisibility=[private|protected|public|package] Set the default symbol visibility
1204 Name(ivar_visibility) Type(enum ivar_visibility) UnknownError(unrecognized ivar visibility value %qs)
1207 Enum(ivar_visibility) String(private) Value(IVAR_VISIBILITY_PRIVATE)
1210 Enum(ivar_visibility) String(protected) Value(IVAR_VISIBILITY_PROTECTED)
1213 Enum(ivar_visibility) String(public) Value(IVAR_VISIBILITY_PUBLIC)
1216 Enum(ivar_visibility) String(package) Value(IVAR_VISIBILITY_PACKAGE)
1219 C++ ObjC++ Var(flag_no_nonansi_builtin, 0)
1222 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1225 C++ ObjC++ Optimization Var(flag_nothrow_opt)
1226 Treat a throw() exception specification as noexcept to improve code size
1229 ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi)
1230 Specify which ABI to use for Objective-C family code and meta-data generation.
1232 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
1233 ; to initialize any non-POD ivars in Objective-C++ classes.
1234 fobjc-call-cxx-cdtors
1235 ObjC++ Var(flag_objc_call_cxx_cdtors)
1236 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
1238 fobjc-direct-dispatch
1239 ObjC ObjC++ Var(flag_objc_direct_dispatch)
1240 Allow fast jumps to the message dispatcher
1242 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
1243 ; @try, etc.) in source code.
1245 ObjC ObjC++ Var(flag_objc_exceptions)
1246 Enable Objective-C exception and synchronization syntax
1249 ObjC ObjC++ LTO Var(flag_objc_gc)
1250 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
1253 ObjC ObjC++ Var(flag_objc_nilcheck,1)
1254 Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.
1256 ; Nonzero means that we generate NeXT setjmp based exceptions.
1257 fobjc-sjlj-exceptions
1258 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
1259 Enable Objective-C setjmp exception handling runtime
1262 ObjC ObjC++ Var(flag_objc1_only)
1263 Conform to the Objective-C 1.0 language as implemented in GCC 4.0
1266 C ObjC C++ ObjC++ Var(flag_openmp)
1267 Enable OpenMP (implies -frecursive in Fortran)
1270 C ObjC C++ ObjC++ Var(flag_openmp_simd)
1271 Enable OpenMP's SIMD directives
1275 Recognize C++ keywords like \"compl\" and \"xor\"
1279 Does nothing. Preserved for backward compatibility.
1286 Look for and use PCH files even when preprocessing
1289 C++ ObjC++ Var(flag_permissive)
1290 Downgrade conformance errors to warnings
1293 C ObjC Var(flag_plan9_extensions)
1294 Enable Plan 9 language extensions
1298 Treat the input file as already preprocessed
1300 ftrack-macro-expansion
1301 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1302 ; converted into ftrack-macro-expansion=
1304 ftrack-macro-expansion=
1305 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1306 -ftrack-macro-expansion=<0|1|2> Track locations of tokens coming from macro expansion and display them in error messages
1309 C++ ObjC++ Var(flag_pretty_templates) Init(1)
1310 -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments
1312 freplace-objc-classes
1313 ObjC ObjC++ LTO Var(flag_replace_objc_classes)
1314 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
1318 Enable automatic template instantiation
1321 C++ ObjC++ Optimization Var(flag_rtti) Init(1)
1322 Generate run time type descriptor information
1325 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_double)
1326 Use the same size for double as for float
1329 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_enums)
1330 Use the narrowest integer type possible for enumeration types
1333 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_wchar)
1334 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
1337 C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
1338 When \"signed\" or \"unsigned\" is not given make the bitfield signed
1341 C ObjC C++ ObjC++ LTO Var(flag_signed_char)
1342 Make \"char\" signed by default
1345 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1348 C++ ObjC++ Var(flag_detailed_statistics)
1349 Display statistics accumulated during compilation
1352 C++ ObjC++ Optimization Var(flag_strict_enums)
1353 Assume that values of enumeration type are always within the minimum range of that type
1356 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1359 C ObjC C++ ObjC++ Joined RejectNegative UInteger
1360 -ftabstop=<number> Distance between tab stops for column reporting
1362 ftemplate-backtrace-limit=
1363 C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
1364 Set the maximum number of template instantiation notes for a single warning or error
1367 C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)
1370 C++ ObjC++ Joined RejectNegative UInteger
1371 -ftemplate-depth=<number> Specify maximum template instantiation depth
1374 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1377 C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
1378 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
1381 C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
1382 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
1385 C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
1386 Make \"char\" unsigned by default
1389 C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
1390 Use __cxa_atexit to register destructors
1392 fuse-cxa-get-exception-ptr
1393 C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
1394 Use __cxa_get_exception_ptr in exception handling
1396 fvisibility-inlines-hidden
1398 Marks all inlined functions and methods as having hidden visibility
1400 fvisibility-ms-compat
1401 C++ ObjC++ Var(flag_visibility_ms_compat)
1402 Changes visibility to match Microsoft Visual Studio by default
1405 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1409 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1413 C++ ObjC++ Var(flag_weak) Init(1)
1414 Emit common-like symbols as weak symbols
1417 C ObjC C++ ObjC++ Joined RejectNegative
1418 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
1421 C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
1422 Generate a #line directive pointing at the current working directory
1425 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1429 ObjC ObjC++ Var(flag_zero_link)
1430 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
1433 ObjC ObjC++ Var(flag_gen_declaration)
1434 Dump declarations to a .decl file
1436 femit-struct-debug-baseonly
1438 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
1440 femit-struct-debug-reduced
1442 -femit-struct-debug-reduced Conservative reduced debug info for structs
1444 femit-struct-debug-detailed=
1445 C ObjC C++ ObjC++ Joined
1446 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
1448 fext-numeric-literals
1450 Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding
1451 number literal rather than a user-defined number literal.
1454 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1455 -idirafter <dir> Add <dir> to the end of the system include path
1458 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1459 -imacros <file> Accept definition of macros in <file>
1462 C ObjC C++ ObjC++ Joined Separate
1463 -imultilib <dir> Set <dir> to be the multilib include subdirectory
1466 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1467 -include <file> Include the contents of <file> before other files
1470 C ObjC C++ ObjC++ Joined Separate
1471 -iprefix <path> Specify <path> as a prefix for next two options
1474 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1475 -isysroot <dir> Set <dir> to be the system root directory
1478 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1479 -isystem <dir> Add <dir> to the start of the system include path
1482 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1483 -iquote <dir> Add <dir> to the end of the quote include path
1486 C ObjC C++ ObjC++ Joined Separate
1487 -iwithprefix <dir> Add <dir> to the end of the system include path
1490 C ObjC C++ ObjC++ Joined Separate
1491 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
1494 C Undocumented RejectDriver
1501 Do not search standard system include directories (those specified with -isystem will still be used)
1505 Do not search standard system include directories for C++
1508 C ObjC C++ ObjC++ Joined Separate
1509 ; Documented in common.opt
1512 C ObjC C++ ObjC++ Alias(Wpedantic)
1513 ; Documented in common.opt
1515 print-objc-runtime-info
1517 Generate C header of platform-specific features
1521 Remap file names when including files
1525 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1528 C++ ObjC++ Alias(std=c++98)
1529 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1533 Conform to the ISO 2011 C++ standard
1536 C++ ObjC++ Alias(std=c++11) Undocumented
1537 Deprecated in favor of -std=c++11
1540 C++ ObjC++ Alias(std=c++14) Undocumented
1541 Deprecated in favor of -std=c++14
1544 C++ ObjC++ Undocumented
1545 Conform to the ISO 2014 C++ standard (experimental and incomplete support)
1549 Conform to the ISO 2017(?) C++ draft standard (experimental and incomplete support)
1552 C++ ObjC++ Alias(std=c++1z) Undocumented
1556 Conform to the ISO 2011 C standard (experimental and incomplete support)
1559 C ObjC Alias(std=c11)
1560 Deprecated in favor of -std=c11
1563 C ObjC Alias(std=c90)
1564 Conform to the ISO 1990 C standard
1568 Conform to the ISO 1990 C standard
1572 Conform to the ISO 1999 C standard
1575 C ObjC Alias(std=c99)
1576 Deprecated in favor of -std=c99
1580 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1581 corrigendum with GNU extensions
1584 C++ ObjC++ Alias(std=gnu++98)
1585 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1586 corrigendum with GNU extensions
1590 Conform to the ISO 2011 C++ standard with GNU extensions (experimental and incomplete support)
1593 C++ ObjC++ Alias(std=gnu++11)
1594 Deprecated in favor of -std=gnu++11
1597 C++ ObjC++ Alias(std=gnu++14) Undocumented
1601 Conform to the ISO 2014 C++ standard with GNU extensions (experimental and incomplete support)
1605 Conform to the ISO 201z(7?) C++ draft standard with GNU extensions (experimental and incomplete support)
1608 C++ ObjC++ Alias(std=gnu++1z) Undocumented
1612 Conform to the ISO 2011 C standard with GNU extensions (experimental and incomplete support)
1615 C ObjC Alias(std=gnu11)
1616 Deprecated in favor of -std=gnu11
1619 C ObjC Alias(std=gnu90)
1620 Conform to the ISO 1990 C standard with GNU extensions
1624 Conform to the ISO 1990 C standard with GNU extensions
1628 Conform to the ISO 1999 C standard with GNU extensions
1631 C ObjC Alias(std=gnu99)
1632 Deprecated in favor of -std=gnu99
1635 C ObjC Alias(std=c90)
1636 Conform to the ISO 1990 C standard
1640 Conform to the ISO 1990 C standard as amended in 1994
1643 C ObjC Alias(std=c99)
1644 Conform to the ISO 1999 C standard
1647 C ObjC Alias(std=c99)
1648 Deprecated in favor of -std=iso9899:1999
1651 C ObjC Alias(std=c11)
1652 Conform to the ISO 2011 C standard (experimental and incomplete support)
1659 Enable traditional preprocessing
1663 -trigraphs Support ISO C trigraphs
1666 C ObjC C++ ObjC++ Var(flag_undef)
1667 Do not predefine system-specific and GCC-specific macros
1671 ; Documented in common.opt
1675 ; Documented in common.opt
1677 ; This comment is to ensure we retain the blank line above.