1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003-2018 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.
204 C Var(flag_gimple) Init(0)
205 Enable parsing GIMPLE.
209 Print the name of header files as they are used.
212 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
213 -I <dir> Add <dir> to the end of the main include path.
217 Generate make dependencies.
220 C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
221 Generate make dependencies and compile.
224 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
225 -MF <file> Write dependency output to the given file.
229 Treat missing header files as generated files.
233 Like -M but ignore system header files.
236 C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
237 Like -MD but ignore system header files.
241 Generate phony targets for all headers.
244 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
245 -MQ <target> Add a MAKE-quoted target.
248 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
249 -MT <target> Add an unquoted target.
253 Do not generate #line directives.
256 C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
257 -U<macro> Undefine <macro>.
260 C ObjC C++ ObjC++ LTO Var(warn_abi) Warning
261 Warn about things that will change when compiling with an ABI-compliant compiler.
264 C ObjC C++ ObjC++ LTO Joined RejectNegative UInteger Warning
265 Warn about things that change between the current -fabi-version and the specified version.
268 C++ ObjC++ Var(warn_abi_tag) Warning
269 Warn if a subobject has an abi_tag attribute that the complete object type does not have.
272 C ObjC C++ ObjC++ LTO Var(warn_psabi) Init(1) Warning Undocumented LangEnabledBy(C ObjC C++ ObjC++,Wabi)
275 C ObjC C++ ObjC++ Var(warn_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
276 Warn about suspicious uses of memory addresses.
279 Name(warn_aligned_new_level) Type(int) UnknownError(argument %qs to %<-Waligned-new%> not recognized)
282 Enum(warn_aligned_new_level) String(none) Value(0)
285 Enum(warn_aligned_new_level) String(global) Value(1)
288 Enum(warn_aligned_new_level) String(all) Value(2)
291 C++ ObjC++ Alias(Waligned-new=,global,none)
292 Warn about 'new' of type with extended alignment without -faligned-new.
295 C++ ObjC++ Var(warn_aligned_new) Enum(warn_aligned_new_level) Joined RejectNegative Warning LangEnabledBy(C++ ObjC++,Wall,1,0)
296 -Waligned-new=[none|global|all] Warn even if 'new' uses a class member allocation function.
299 C ObjC C++ ObjC++ Warning
300 Enable most warning messages.
303 C ObjC C++ ObjC++ Var(warn_alloca) Warning
304 Warn on any use of alloca.
306 Walloc-size-larger-than=
307 C ObjC C++ ObjC++ Var(warn_alloc_size_limit) Warning Joined LangEnabledBy(C ObjC C++ ObjC++,Wall)
308 -Walloc-size-larger-than=<bytes> Warn for calls to allocation functions that
309 attempt to allocate objects larger than the specified number of bytes.
312 C ObjC C++ ObjC++ Var(warn_alloc_zero) Warning
313 -Walloc-zero Warn for calls to allocation functions that specify zero bytes.
316 C ObjC C++ LTO ObjC++ Var(warn_alloca_limit) Warning Joined RejectNegative UInteger
317 -Walloca-larger-than=<number> Warn on unbounded uses of
318 alloca, and on bounded uses of alloca whose bound can be larger than
322 LangEnabledBy(C ObjC C++ ObjC++,Wall)
326 LangEnabledBy(C ObjC C++ ObjC++,Wall,1,0)
330 ObjC ObjC++ Var(warn_assign_intercept) Warning
331 Warn whenever an Objective-C assignment is being intercepted by the garbage collector.
334 C ObjC Var(warn_bad_function_cast) Warning
335 Warn about casting functions to incompatible types.
338 C ObjC C++ ObjC++ Var(warn_bool_compare) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
339 Warn about boolean expression compared with an integer value different from true/false.
342 C ObjC C++ ObjC++ Var(warn_bool_op) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
343 Warn about certain operations on boolean expressions.
346 C ObjC C++ ObjC++ Var(warn_frame_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
347 Warn when __builtin_frame_address or __builtin_return_address is used unsafely.
349 Wbuiltin-declaration-mismatch
350 C ObjC C++ ObjC++ Var(warn_builtin_declaraion_mismatch) Init(1) Warning
351 Warn when a built-in function is declared with the wrong signature.
353 Wbuiltin-macro-redefined
354 C ObjC C++ ObjC++ CPP(warn_builtin_macro_redefined) CppReason(CPP_W_BUILTIN_MACRO_REDEFINED) Var(cpp_warn_builtin_macro_redefined) Init(1) Warning
355 Warn when a built-in preprocessor macro is undefined or redefined.
358 C ObjC CPP(cpp_warn_c90_c99_compat) CppReason(CPP_W_C90_C99_COMPAT) Var(warn_c90_c99_compat) Init(-1) Warning
359 Warn about features not present in ISO C90, but present in ISO C99.
362 C ObjC Var(warn_c99_c11_compat) Init(-1) Warning
363 Warn about features not present in ISO C99, but present in ISO C11.
366 C ObjC Var(warn_cxx_compat) CPP(warn_cxx_operator_names) CppReason(CPP_W_CXX_OPERATOR_NAMES) Init(0) Warning
367 Warn about C constructs that are not in the common subset of C and C++.
370 C++ ObjC++ Warning Alias(Wc++11-compat) Undocumented
373 C++ ObjC++ Var(warn_cxx11_compat) Warning LangEnabledBy(C++ ObjC++,Wall) Init(0) CPP(cpp_warn_cxx11_compat) CppReason(CPP_W_CXX11_COMPAT)
374 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011.
377 C++ ObjC++ Var(warn_cxx14_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
378 Warn about C++ constructs whose meaning differs between ISO C++ 2011 and ISO C++ 2014.
381 C++ ObjC++ Warning Alias(Wc++17-compat) Undocumented
384 C++ ObjC++ Var(warn_cxx17_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
385 Warn about C++ constructs whose meaning differs between ISO C++ 2014 and ISO C++ 2017.
388 C ObjC C++ ObjC++ Var(warn_cast_function_type) Warning EnabledBy(Wextra)
389 Warn about casts between incompatible function types.
392 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
393 Warn about casts which discard qualifiers.
396 C++ ObjC++ Warning Alias(Wcatch-value=, 1, 0)
397 Warn about catch handlers of non-reference type.
400 C++ ObjC++ Var(warn_catch_value) Warning Joined RejectNegative UInteger LangEnabledBy(C++ ObjC++,Wall, 1, 0)
401 Warn about catch handlers of non-reference type.
404 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
405 Warn about subscripts whose type is \"char\".
408 C ObjC C++ ObjC++ Var(warn_chkp) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
409 Warn about memory access errors found by Pointer Bounds Checker.
412 C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
413 Warn about variables that might be changed by \"longjmp\" or \"vfork\".
416 C ObjC C++ ObjC++ CPP(warn_comments) CppReason(CPP_W_COMMENTS) Var(cpp_warn_comment) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
417 Warn about possibly nested block comments, and C++ comments spanning more than one physical line.
420 C ObjC C++ ObjC++ Warning Alias(Wcomment)
421 Synonym for -Wcomment.
423 Wconditionally-supported
424 C++ ObjC++ Var(warn_conditionally_supported) Warning
425 Warn for conditionally-supported constructs.
428 C ObjC C++ ObjC++ Var(warn_conversion) Warning
429 Warn for implicit type conversions that may change a value.
432 C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
433 Warn for converting NULL from/to a non-pointer type.
436 C ObjC C++ ObjC++ CppReason(CPP_W_WARNING_DIRECTIVE)
437 ; Documented in common.opt
440 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
441 Warn when all constructors and destructors are private.
444 C ObjC C++ ObjC++ Var(warn_dangling_else) Warning LangEnabledBy(C ObjC C++ ObjC++,Wparentheses)
445 Warn about dangling else.
448 C ObjC C++ ObjC++ CPP(warn_date_time) CppReason(CPP_W_DATE_TIME) Var(cpp_warn_date_time) Init(0) Warning
449 Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage.
451 Wdeclaration-after-statement
452 C ObjC Var(warn_declaration_after_statement) Init(-1) Warning
453 Warn when a declaration is found after a statement.
456 C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
457 Warn when deleting a pointer to incomplete type.
459 Wdelete-non-virtual-dtor
460 C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall || Weffc++)
461 Warn about deleting polymorphic objects with non-virtual destructors.
464 C C++ ObjC ObjC++ CPP(cpp_warn_deprecated) CppReason(CPP_W_DEPRECATED) Var(warn_deprecated) Init(1) Warning
465 Warn if a deprecated compiler feature, class, method, or field is used.
468 C ObjC Var(warn_designated_init) Init(1) Warning
469 Warn about positional initialization of structs requiring designated initializers.
471 Wdiscarded-array-qualifiers
472 C ObjC Var(warn_discarded_array_qualifiers) Init(1) Warning
473 Warn if qualifiers on arrays which are pointer targets are discarded.
475 Wdiscarded-qualifiers
476 C ObjC Var(warn_discarded_qualifiers) Init(1) Warning
477 Warn if type qualifiers on pointers are discarded.
480 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
481 Warn about compile-time integer division by zero.
484 C ObjC C++ ObjC++ Var(warn_duplicated_branches) Init(0) Warning
485 Warn about duplicated branches in if-else statements.
488 C ObjC C++ ObjC++ Var(warn_duplicated_cond) Init(0) Warning
489 Warn about duplicated conditions in an if-else-if chain.
492 C++ ObjC++ Var(warn_ecpp) Warning
493 Warn about violations of Effective C++ style rules.
496 C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
497 Warn about an empty body in an if or else statement.
500 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)
501 Warn about stray tokens after #else and #endif.
504 C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall || Wc++-compat)
505 Warn about comparison of different enum types.
509 ; Documented in common.opt
511 Werror-implicit-function-declaration
512 C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
513 This switch is deprecated; use -Werror=implicit-function-declaration instead.
516 C ObjC C++ ObjC++ Warning
520 C++ ObjC++ Var(warn_extra_semi) Warning
521 Warn about semicolon after in-class function definition.
524 C ObjC C++ ObjC++ Var(warn_float_conversion) Warning LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
525 Warn for implicit type conversions that cause loss of floating point precision.
528 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
529 Warn if testing floating point numbers for equality.
532 C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
533 Warn about printf/scanf/strftime/strfmon format string anomalies.
536 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
537 Warn about format strings that contain NUL bytes.
540 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
541 Warn if passing too many arguments to a function for its format string.
544 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
545 Warn about format strings that are not literals.
548 C ObjC C++ LTO ObjC++ Warning Alias(Wformat-overflow=, 1, 0) IntegerRange(0, 2)
549 Warn about function calls with format strings that write past the end
550 of the destination region. Same as -Wformat-overflow=1.
553 C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
554 Warn about possible security problems with format functions.
557 C ObjC C++ ObjC++ Var(warn_format_signedness) Warning
558 Warn about sign differences with format functions.
561 C ObjC C++ LTO ObjC++ Warning Alias(Wformat-truncation=, 1, 0)
562 Warn about calls to snprintf and similar functions that truncate output.
563 Same as -Wformat-truncation=1.
566 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
567 Warn about strftime formats yielding 2-digit years.
570 C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
571 Warn about zero-length formats.
574 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0) IntegerRange(0, 2)
575 Warn about printf/scanf/strftime/strfmon format string anomalies.
578 C ObjC C++ LTO ObjC++ Joined RejectNegative UInteger Var(warn_format_overflow) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0) IntegerRange(0, 2)
579 Warn about function calls with format strings that write past the end
580 of the destination region.
583 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format_trunc) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0) IntegerRange(0, 2)
584 Warn about calls to snprintf and similar functions that truncate output.
587 C ObjC C++ ObjC++ Var(warn_if_not_aligned) Init(1) Warning
588 Warn when the field in a struct is not aligned.
591 C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
592 Warn whenever type qualifiers are ignored.
595 C C++ Var(warn_ignored_attributes) Init(1) Warning
596 Warn whenever attributes are ignored.
598 Wincompatible-pointer-types
599 C ObjC Var(warn_incompatible_pointer_types) Init(1) Warning
600 Warn when there is a conversion between pointers that have incompatible types.
603 C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
604 Warn about variables which are initialized to themselves.
607 C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
608 Warn about implicit declarations.
610 Wimplicit-fallthrough=
611 LangEnabledBy(C ObjC C++ ObjC++,Wextra,3,0)
615 C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
616 Warn about implicit conversions from \"float\" to \"double\".
618 Wexpansion-to-defined
619 C ObjC C++ ObjC++ CPP(warn_expansion_to_defined) CppReason(CPP_W_EXPANSION_TO_DEFINED) Var(cpp_warn_expansion_to_defined) Init(0) Warning EnabledBy(Wextra || Wpedantic)
620 Warn if \"defined\" is used outside #if.
622 Wimplicit-function-declaration
623 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
624 Warn about implicit function declarations.
627 C ObjC Var(warn_implicit_int) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
628 Warn when a declaration does not specify a type.
631 C ObjC C++ ObjC++ Undocumented Ignore
633 Winherited-variadic-ctor
634 C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
635 Warn about C++11 inheriting constructors when the base has a variadic constructor.
638 C ObjC Var(warn_int_conversion) Init(1) Warning
639 Warn about incompatible integer to pointer and pointer to integer conversions.
642 C ObjC C++ ObjC++ Var(warn_int_in_bool_context) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
643 Warn for suspicious integer expressions in boolean context.
646 C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
647 Warn when there is a cast to a pointer from an integer of a different size.
650 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
651 Warn about invalid uses of the \"offsetof\" macro.
654 C ObjC C++ ObjC++ CPP(warn_invalid_pch) CppReason(CPP_W_INVALID_PCH) Var(cpp_warn_invalid_pch) Init(0) Warning
655 Warn about PCH files that are found but not used.
658 C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
659 Warn when a jump misses a variable initialization.
662 C++ ObjC++ CPP(warn_literal_suffix) CppReason(CPP_W_LITERAL_SUFFIX) Var(cpp_warn_literal_suffix) Init(1) Warning
663 Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.
666 C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
667 Warn when a logical operator is suspiciously always evaluating to true or false.
669 Wlogical-not-parentheses
670 C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
671 Warn when logical not is used on the left hand side operand of a comparison.
674 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)
675 Do not warn about using \"long long\" when -pedantic.
678 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
679 Warn about suspicious declarations of \"main\".
682 LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
685 Wmemset-transposed-args
686 C ObjC C++ ObjC++ Var(warn_memset_transposed_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
687 Warn about suspicious calls to memset where the third argument is constant literal zero and the second is not.
690 C ObjC C++ ObjC++ Var(warn_memset_elt_size) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
691 Warn about suspicious calls to memset where the third argument contains the number of elements not multiplied by the element size.
693 Wmisleading-indentation
694 C C++ Common Var(warn_misleading_indentation) Warning LangEnabledBy(C C++,Wall)
695 Warn when the indentation of the code does not reflect the block structure.
698 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
699 Warn about possibly missing braces around initializers.
701 Wmissing-declarations
702 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
703 Warn about global functions without previous declarations.
705 Wmissing-field-initializers
706 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
707 Warn about missing fields in struct initializers.
709 Wmultistatement-macros
710 C ObjC C++ ObjC++ Var(warn_multistatement_macros) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
711 Warn about unsafe macros expanding to multiple statements used as a body of a clause such as if, else, while, switch, or for.
713 Wmultiple-inheritance
714 C++ ObjC++ Var(warn_multiple_inheritance) Warning
715 Warn on direct multiple inheritance.
718 C++ ObjC++ Var(warn_namespaces) Warning
719 Warn on namespace definition.
722 C ObjC C++ ObjC++ Var(warn_packed_not_aligned) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
723 Warn when fields in a struct with the packed attribute are misaligned.
726 C++ ObjC++ Var(warn_sized_deallocation) Warning EnabledBy(Wextra)
727 Warn about missing sized deallocation functions.
730 C ObjC C++ ObjC++ Var(warn_sizeof_pointer_div) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
731 Warn about suspicious divisions of two sizeof expressions that don't work correctly with pointers.
733 Wsizeof-pointer-memaccess
734 C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
735 Warn about suspicious length parameters to certain string functions if the argument uses sizeof.
737 Wsizeof-array-argument
738 C ObjC C++ ObjC++ Var(warn_sizeof_array_argument) Warning Init(1)
739 Warn when sizeof is applied on a parameter declared as an array.
742 C ObjC C++ ObjC++ Warning Alias(Wstringop-overflow=, 2, 0)
743 Warn about buffer overflow in string manipulation functions like memcpy
747 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_stringop_overflow) Init(2) Warning LangEnabledBy(C ObjC C++ ObjC++, Wall, 2, 0) IntegerRange(0, 4)
748 Under the control of Object Size type, warn about buffer overflow in string
749 manipulation functions like memcpy and strcpy.
752 C ObjC C++ ObjC++ Var(warn_stringop_truncation) Warning Init (1) LangEnabledBy(C ObjC C++ ObjC++, Wall)
753 Warn about truncation in string manipulation functions like strncat and strncpy.
755 Wsuggest-attribute=format
756 C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
757 Warn about functions which might be candidates for format attributes.
760 C++ ObjC++ Var(warn_override) Warning
761 Suggest that the override keyword be used when the declaration of a virtual
762 function overrides another.
765 C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
766 Warn about enumerated switches, with no default, missing a case.
769 C ObjC C++ ObjC++ Var(warn_switch_default) Warning
770 Warn about enumerated switches missing a \"default:\" statement.
773 C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
774 Warn about all enumerated switches missing a specific case.
777 C ObjC C++ ObjC++ Var(warn_switch_bool) Warning Init(1)
778 Warn about switches with boolean controlling expression.
781 C++ ObjC++ Var(warn_templates) Warning
782 Warn on primary template declaration.
784 Wmissing-format-attribute
785 C ObjC C++ ObjC++ Warning Alias(Wsuggest-attribute=format)
788 Wmissing-include-dirs
789 C ObjC C++ ObjC++ CPP(warn_missing_include_dirs) CppReason(CPP_W_MISSING_INCLUDE_DIRS) Var(cpp_warn_missing_include_dirs) Init(0) Warning
790 Warn about user-specified include directories that do not exist.
792 Wmissing-parameter-type
793 C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
794 Warn about function parameters declared without a type specifier in K&R-style functions.
797 C ObjC Var(warn_missing_prototypes) Warning
798 Warn about global functions without prototypes.
801 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
804 C ObjC C++ ObjC++ CPP(warn_multichar) CppReason(CPP_W_MULTICHAR) Var(cpp_warn_multichar) Init(0) Warning
805 Warn about use of multi-character character constants.
808 C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall || Wc++11-compat)
809 Warn about narrowing conversions within { } that are ill-formed in C++11.
812 C ObjC Var(warn_nested_externs) Warning
813 Warn about \"extern\" declarations not at file scope.
816 C++ ObjC++ Var(warn_noexcept) Warning
817 Warn when a noexcept expression evaluates to false even though the expression can't actually throw.
820 C++ ObjC++ Warning Var(warn_noexcept_type) LangEnabledBy(C++ ObjC++,Wabi || Wc++17-compat)
821 Warn if C++17 noexcept function type will change the mangled name of a symbol.
824 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
825 Warn when non-templatized friend functions are declared within a template.
828 C++ ObjC++ Var(warn_class_memaccess) Warning LangEnabledBy(C++ ObjC++, Wall)
829 Warn for unsafe raw memory writes to objects of class types.
832 C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
833 Warn about non-virtual destructors.
836 C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
837 Warn about NULL being passed to argument slots marked as requiring non-NULL.
840 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
844 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
848 C ObjC C++ ObjC++ Warning Alias(Wnormalized=,nfc,none)
852 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)
853 -Wnormalized=[none|id|nfc|nfkc] Warn about non-normalized Unicode strings.
855 ; Required for these enum values.
860 Name(cpp_normalize_level) Type(int) UnknownError(argument %qs to %<-Wnormalized%> not recognized)
863 Enum(cpp_normalize_level) String(none) Value(normalized_none)
866 Enum(cpp_normalize_level) String(nfkc) Value(normalized_KC)
869 Enum(cpp_normalize_level) String(id) Value(normalized_identifier_C)
872 Enum(cpp_normalize_level) String(nfc) Value(normalized_C)
875 C++ ObjC++ Var(warn_old_style_cast) Warning
876 Warn if a C-style cast is used in a program.
878 Wold-style-declaration
879 C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
880 Warn for obsolescent usage in a declaration.
882 Wold-style-definition
883 C ObjC Var(warn_old_style_definition) Warning
884 Warn if an old-style parameter definition is used.
887 C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
888 Warn if a simd directive is overridden by the vectorizer cost model.
891 C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
892 Warn if a string is longer than the maximum portable length specified by the standard.
895 C++ ObjC++ Var(warn_overloaded_virtual) Warning
896 Warn about overloaded virtual function names.
899 C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
900 Warn about overriding initializers without side effects.
902 Woverride-init-side-effects
903 C ObjC Var(warn_override_init_side_effects) Init(1) Warning
904 Warn about overriding initializers with side effects.
906 Wpacked-bitfield-compat
907 C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
908 Warn about packed bit-fields whose offset changed in GCC 4.4.
911 C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
912 Warn about possibly missing parentheses.
915 C ObjC C++ ObjC++ CPP(cpp_pedantic) CppReason(CPP_W_PEDANTIC) Warning
916 ; Documented in common.opt
919 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
920 Warn when converting the type of pointers to member functions.
923 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
924 Warn about function pointer arithmetic.
927 C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall || Wpedantic)
928 Warn when a pointer differs in signedness in an assignment.
931 C ObjC C++ ObjC++ Var(warn_pointer_compare) Init(1) Warning
932 Warn when a pointer is compared with a zero character constant.
935 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
936 Warn when a pointer is cast to an integer of a different size.
939 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
940 Warn about misuses of pragmas.
942 Wproperty-assign-default
943 ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
944 Warn if a property for an Objective-C object has no assign semantics specified.
947 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
948 Warn if inherited methods are unimplemented.
951 C++ Warning Alias(Wplacement-new=, 1, 0)
952 Warn for placement new expressions with undefined behavior.
955 C++ Joined RejectNegative UInteger Var(warn_placement_new) Init(-1) Warning IntegerRange(0, 2)
956 Warn for placement new expressions with undefined behavior.
959 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
960 Warn about multiple declarations of the same object.
963 C++ ObjC++ Var(warn_register) Warning
964 Warn about uses of register storage specifier.
967 C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
968 Warn when the compiler reorders code.
971 C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) Init(-1)
972 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++).
974 Wscalar-storage-order
975 C ObjC C++ ObjC++ Init(1) Warning
976 Warn on suspicious constructs involving reverse scalar storage order.
979 ObjC ObjC++ Var(warn_selector) Warning
980 Warn if a selector has multiple methods.
983 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
984 Warn about possible violations of sequence point rules.
987 ObjC ObjC++ Var(warn_shadow_ivar) EnabledBy(Wshadow) Init(1) Warning
988 Warn if a local declaration hides an instance variable.
991 C ObjC C++ ObjC++ Warning Alias(Wshift-overflow=, 1, 0)
992 Warn if left shift of a signed value overflows.
995 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_shift_overflow) Init(-1) Warning IntegerRange(0, 2)
996 Warn if left shift of a signed value overflows.
998 Wshift-count-negative
999 C ObjC C++ ObjC++ Var(warn_shift_count_negative) Init(1) Warning
1000 Warn if shift count is negative.
1002 Wshift-count-overflow
1003 C ObjC C++ ObjC++ Var(warn_shift_count_overflow) Init(1) Warning
1004 Warn if shift count >= width of type.
1006 Wshift-negative-value
1007 C ObjC C++ ObjC++ Var(warn_shift_negative_value) Init(-1) Warning
1008 Warn if left shifting a negative value.
1011 C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
1012 Warn about signed-unsigned comparisons.
1015 C ObjC C++ ObjC++ EnabledBy(Wextra)
1019 C ObjC C++ ObjC++ Var(warn_sign_conversion) Warning LangEnabledBy(C ObjC,Wconversion)
1020 Warn for implicit type conversions between signed and unsigned integers.
1023 C++ ObjC++ Var(warn_sign_promo) Warning
1024 Warn when overload promotes from unsigned to signed.
1026 Wstrict-null-sentinel
1027 C++ ObjC++ Warning Var(warn_strict_null_sentinel)
1028 Warn about uncasted NULL used as sentinel.
1031 C ObjC Var(warn_strict_prototypes) Warning
1032 Warn about unprototyped function declarations.
1035 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0) IntegerRange(0, 3)
1039 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0) IntegerRange(0, 5)
1042 Wstrict-selector-match
1043 ObjC ObjC++ Var(warn_strict_selector_match) Warning
1044 Warn if type signatures of candidate methods do not match exactly.
1047 C C++ Var(warn_sync_nand) Init(1) Warning
1048 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used.
1051 C++ ObjC++ Var(warn_synth) Warning
1052 Deprecated. This switch has no effect.
1055 C ObjC C++ ObjC++ Warning
1056 ; Documented in common.opt
1058 Wtautological-compare
1059 C ObjC C++ ObjC++ Var(warn_tautological_compare) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
1060 Warn if a comparison always evaluates to true or false.
1063 C++ ObjC++ Warning Var(warn_terminate) Init(1)
1064 Warn if a throw expression will always result in a call to terminate().
1067 C ObjC CPP(cpp_warn_traditional) CppReason(CPP_W_TRADITIONAL) Var(warn_traditional) Init(0) Warning
1068 Warn about features not present in traditional C.
1070 Wtraditional-conversion
1071 C ObjC Var(warn_traditional_conversion) Warning
1072 Warn of prototypes causing type conversions different from what would happen in the absence of prototype.
1075 C ObjC C++ ObjC++ CPP(warn_trigraphs) CppReason(CPP_W_TRIGRAPHS) Var(cpp_warn_trigraphs) Init(2) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
1076 Warn if trigraphs are encountered that might affect the meaning of the program.
1078 Wundeclared-selector
1079 ObjC ObjC++ Var(warn_undeclared_selector) Warning
1080 Warn about @selector()s without previously declared methods.
1083 C ObjC C++ ObjC++ CPP(warn_undef) CppReason(CPP_W_UNDEF) Var(cpp_warn_undef) Init(0) Warning
1084 Warn if an undefined macro is used in an #if directive.
1087 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
1090 Wmaybe-uninitialized
1091 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
1095 C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
1096 Warn about unrecognized pragmas.
1098 Wunsuffixed-float-constants
1099 C ObjC Var(warn_unsuffixed_float_constants) Warning
1100 Warn about unsuffixed float constants.
1103 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
1104 ; documented in common.opt
1106 Wunused-local-typedefs
1107 C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
1108 Warn when typedefs locally defined in a function are not used.
1111 C ObjC C++ ObjC++ CppReason(CPP_W_UNUSED_MACROS) Var(cpp_warn_unused_macros) Warning
1112 Warn about macros defined in the main file that are not used.
1115 C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
1116 Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value.
1119 C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wunused)
1120 ; documented in common.opt
1122 Wunused-const-variable
1123 C ObjC C++ ObjC++ Warning Alias(Wunused-const-variable=, 2, 0)
1124 Warn when a const variable is unused.
1126 Wunused-const-variable=
1127 C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_unused_const_variable) Warning LangEnabledBy(C ObjC,Wunused-variable, 1, 0) IntegerRange(0, 2)
1128 Warn when a const variable is unused.
1131 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)
1132 Warn about using variadic macros.
1135 C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
1136 Warn about questionable usage of the macros used to retrieve variable arguments.
1139 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
1140 Warn if a variable length array is used.
1143 C ObjC C++ ObjC++ Var(warn_vla_limit) Warning Joined RejectNegative UInteger
1144 -Wvla-larger-than=<number> Warn on unbounded uses of variable-length arrays, and
1145 on bounded uses of variable-length arrays whose bound can be
1146 larger than <number> bytes.
1148 Wvolatile-register-var
1149 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
1150 Warn when a register variable is declared volatile.
1152 Wvirtual-inheritance
1153 C++ ObjC++ Var(warn_virtual_inheritance) Warning
1154 Warn on direct virtual inheritance.
1156 Wvirtual-move-assign
1157 C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
1158 Warn if a virtual base has a non-trivial move assignment operator.
1161 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
1162 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.
1164 Wzero-as-null-pointer-constant
1165 C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
1166 Warn when a literal '0' is used as null pointer.
1169 C++ ObjC++ Var(warn_useless_cast) Warning
1170 Warn about useless casts.
1173 C++ ObjC++ Var(warn_subobject_linkage) Warning Init(1)
1174 Warn if a class type has a base or a field whose type uses the anonymous namespace or depends on a type with no linkage.
1176 Wduplicate-decl-specifier
1177 C ObjC Var(warn_duplicate_decl_specifier) Warning LangEnabledBy(C ObjC,Wall)
1178 Warn when a declaration has duplicate const, volatile, restrict or _Atomic specifier.
1181 C ObjC C++ ObjC++ Var(warn_restrict) Warning LangEnabledBy(C ObjC C++ ObjC++, Wall)
1182 Warn when an argument passed to a restrict-qualified parameter aliases with
1187 A synonym for -std=c89 (for C) or -std=c++98 (for C++).
1190 C ObjC C++ ObjC++ Joined
1191 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
1193 fabi-compat-version=
1194 C++ ObjC++ Joined RejectNegative UInteger Var(flag_abi_compat_version) Init(-1)
1195 The version of the C++ ABI used for -Wabi warnings and link compatibility aliases.
1198 C++ ObjC++ Var(flag_access_control) Init(1)
1199 Enforce class member access control semantics.
1202 C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
1203 -fada-spec-parent=unit Dump Ada specs as child units of given parent.
1206 C++ ObjC++ Alias(faligned-new=,1,0)
1207 Support C++17 allocation of over-aligned types.
1210 C++ ObjC++ Joined RejectNegative Var(aligned_new_threshold) UInteger Init(-1)
1211 -faligned-new=<N> Use C++17 over-aligned type allocation for alignments greater than N.
1214 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1216 fallow-parameterless-variadic-functions
1217 C ObjC Var(flag_allow_parameterless_variadic_functions)
1218 Allow variadic functions without named parameter.
1220 falt-external-templates
1221 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1222 No longer supported.
1225 C ObjC C++ ObjC++ Var(flag_no_asm, 0)
1226 Recognize the \"asm\" keyword.
1228 ; Define extra predefined macros for use in libgcc.
1230 C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)
1233 C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
1234 Recognize built-in functions.
1237 C ObjC C++ ObjC++ Joined
1239 fcanonical-system-headers
1241 Where shorter, use canonicalized paths to systems headers.
1243 fcheck-pointer-bounds
1244 C ObjC C++ ObjC++ LTO Report Var(flag_check_pointer_bounds)
1245 Add Pointer Bounds Checker instrumentation. fchkp-* flags are used to
1246 control instrumentation. Currently available for C, C++ and ObjC.
1248 fchkp-check-incomplete-type
1249 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_incomplete_type) Init(1)
1250 Generate pointer bounds checks for variables with incomplete type.
1252 fchkp-zero-input-bounds-for-main
1253 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_zero_input_bounds_for_main) Init(0)
1254 Use zero bounds for all incoming arguments in 'main' function. It helps when
1255 instrumented binaries are used with legacy libs.
1257 fchkp-first-field-has-own-bounds
1258 C ObjC C++ ObjC++ LTO RejectNegative Report Var(flag_chkp_first_field_has_own_bounds)
1259 Forces Pointer Bounds Checker to use narrowed bounds for address of the first
1260 field in the structure. By default pointer to the first field has the same
1261 bounds as pointer to the whole structure.
1264 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_narrow_bounds) Init(1)
1265 Control how Pointer Bounds Checker handle pointers to object fields. When
1266 narrowing is on, field bounds are used. Otherwise full object bounds are used.
1268 fchkp-narrow-to-innermost-array
1269 C ObjC C++ ObjC++ LTO RejectNegative Report Var(flag_chkp_narrow_to_innermost_arrray)
1270 Forces Pointer Bounds Checker to use bounds of the innermost arrays in case of
1271 nested static arrays access. By default outermost array is used.
1273 fchkp-flexible-struct-trailing-arrays
1274 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_flexible_struct_trailing_arrays)
1275 Forces Pointer Bounds Checker to treat all trailing arrays in structures as
1276 possibly flexible. By default only arrays fields with zero length or that are
1277 marked with attribute bnd_variable_size are treated as flexible.
1280 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_optimize) Init(-1)
1281 Allow Pointer Bounds Checker optimizations. By default allowed
1282 on optimization levels >0.
1284 fchkp-use-fast-string-functions
1285 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_fast_string_functions) Init(0)
1286 Allow to use *_nobnd versions of string functions by Pointer Bounds Checker.
1288 fchkp-use-nochk-string-functions
1289 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_nochk_string_functions) Init(0)
1290 Allow to use *_nochk versions of string functions by Pointer Bounds Checker.
1292 fchkp-use-static-bounds
1293 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_static_bounds) Init(1)
1294 Use statically initialized variable for vars bounds instead of
1295 generating them each time it is required.
1297 fchkp-use-static-const-bounds
1298 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_static_const_bounds) Init(-1)
1299 Use statically initialized variable for constant bounds instead of
1300 generating them each time it is required.
1302 fchkp-treat-zero-dynamic-size-as-infinite
1303 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_zero_dynamic_size_as_infinite) Init(0)
1304 With this option zero size obtained dynamically for objects with
1305 incomplete type will be treated as infinite.
1308 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_read) Init(1)
1309 Generate checks for all read accesses to memory.
1312 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_write) Init(1)
1313 Generate checks for all write accesses to memory.
1316 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_store_bounds) Init(1)
1317 Generate bounds stores for pointer writes.
1319 fchkp-instrument-calls
1320 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_calls) Init(1)
1321 Generate bounds passing for calls.
1323 fchkp-instrument-marked-only
1324 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_marked_only) Init(0)
1325 Instrument only functions marked with bnd_instrument attribute.
1328 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_wrappers) Init(1)
1329 Transform instrumented builtin calls into calls to wrappers.
1334 static-libmpxwrappers
1337 fcilkplus Undocumented
1338 C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
1339 Deprecated in GCC 8. This switch has no effect.
1342 C++ ObjC++ Var(flag_concepts)
1343 Enable support for C++ concepts.
1347 Allow the arguments of the '?' operator to have different types.
1350 C++ ObjC++ Var(flag_conserve_space)
1351 Does nothing. Preserved for backward compatibility.
1353 fconstant-string-class=
1354 ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
1355 -fconst-string-class=<name> Use class <name> for constant strings.
1358 C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
1359 -fconstexpr-depth=<number> Specify maximum constexpr recursion depth.
1361 fconstexpr-loop-limit=
1362 C++ ObjC++ Joined RejectNegative UInteger Var(constexpr_loop_limit) Init(262144)
1363 -fconstexpr-loop-limit=<number> Specify maximum constexpr loop iteration count.
1367 Emit debug annotations during preprocessing.
1370 C++ ObjC++ Var(flag_deduce_init_list) Init(0)
1371 -fdeduce-init-list enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list.
1374 C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
1375 Factor complex constructors and destructors to favor space over speed.
1379 Does nothing. Preserved for backward compatibility.
1381 fdiagnostics-show-template-tree
1382 C++ ObjC++ Var(flag_diagnostics_show_template_tree) Init(0)
1383 Print hierarchical comparisons when template types are mismatched.
1387 Preprocess directives only.
1389 fdollars-in-identifiers
1391 Permit '$' as an identifier character.
1394 C ObjC C++ ObjC++ Joined RejectNegative
1395 -fmacro-prefix-map=<old>=<new> Map one directory name to another in __FILE__, __BASE_FILE__, and __builtin_FILE().
1398 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
1399 Write all declarations as Ada code transitively.
1402 C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
1403 Write all declarations as Ada code for the given file only.
1406 C++ ObjC++ Var(flag_elide_constructors) Init(1)
1409 C++ ObjC++ Var(flag_elide_type) Init(1)
1410 -fno-elide-type Do not elide common elements in template comparisons.
1413 C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
1414 Generate code to check exception specifications.
1417 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1420 C ObjC C++ ObjC++ Joined RejectNegative
1421 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>.
1423 fextended-identifiers
1425 Permit universal character names (\\u and \\U) in identifiers.
1428 C ObjC C++ ObjC++ Joined RejectNegative
1429 -finput-charset=<cset> Specify the default character set for source files.
1432 C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
1433 Support dynamic initialization of thread-local variables in a different translation unit.
1436 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1439 C++ ObjC++ Var(flag_new_for_scope) Init(1)
1440 Scope of for-init-statement variables is local to the loop.
1444 Do not assume that standard C libraries and \"main\" exist.
1447 C++ ObjC++ Var(flag_no_gnu_keywords, 0)
1448 Recognize GNU-defined keywords.
1451 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
1452 Generate code for GNU runtime environment.
1455 C ObjC Var(flag_gnu89_inline) Init(-1)
1456 Use traditional GNU semantics for inline functions.
1459 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1462 C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})
1465 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1469 Assume normal C execution environment.
1472 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1473 No longer supported.
1476 C++ ObjC++ Var(flag_implement_inlines) Init(1)
1477 Export functions even if they can be inlined.
1479 fimplicit-inline-templates
1480 C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
1481 Emit implicit instantiations of inline templates.
1484 C++ ObjC++ Var(flag_implicit_templates) Init(1)
1485 Emit implicit instantiations of templates.
1487 fnew-inheriting-ctors
1488 C++ ObjC++ Var(flag_new_inheriting_ctors) Init(1)
1489 Implement C++17 inheriting constructor semantics.
1492 C++ ObjC++ Var(flag_friend_injection)
1493 Inject friend functions into enclosing namespace.
1495 fkeep-inline-dllexport
1496 C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
1497 Don't emit dllexported inline functions unless needed.
1500 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1502 flax-vector-conversions
1503 C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
1504 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
1507 C ObjC C++ ObjC++ Var(flag_ms_extensions)
1508 Don't warn about uses of Microsoft extensions.
1511 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1514 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1517 C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1519 fname-mangling-version-
1520 C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)
1523 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1526 C++ ObjC++ Var(flag_new_ttp)
1527 Implement resolution of DR 150 for matching of template template arguments.
1530 ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime)
1531 Generate code for NeXT (Apple Mac OS X) runtime environment.
1534 ObjC ObjC++ Var(flag_nil_receivers) Init(1)
1535 Assume that receivers of Objective-C messages may be nil.
1538 ObjC ObjC++ Var(flag_local_ivars) Init(1)
1539 Allow access to instance variables as if they were local declarations within instance method implementations.
1542 ObjC ObjC++ Joined RejectNegative Enum(ivar_visibility) Var(default_ivar_visibility) Init(IVAR_VISIBILITY_PROTECTED)
1543 -fvisibility=[private|protected|public|package] Set the default symbol visibility.
1546 Name(ivar_visibility) Type(enum ivar_visibility) UnknownError(unrecognized ivar visibility value %qs)
1549 Enum(ivar_visibility) String(private) Value(IVAR_VISIBILITY_PRIVATE)
1552 Enum(ivar_visibility) String(protected) Value(IVAR_VISIBILITY_PROTECTED)
1555 Enum(ivar_visibility) String(public) Value(IVAR_VISIBILITY_PUBLIC)
1558 Enum(ivar_visibility) String(package) Value(IVAR_VISIBILITY_PACKAGE)
1561 C++ ObjC++ Var(flag_no_nonansi_builtin, 0)
1564 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1567 C++ ObjC++ Optimization Var(flag_nothrow_opt)
1568 Treat a throw() exception specification as noexcept to improve code size.
1571 ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi)
1572 Specify which ABI to use for Objective-C family code and meta-data generation.
1574 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
1575 ; to initialize any non-POD ivars in Objective-C++ classes.
1576 fobjc-call-cxx-cdtors
1577 ObjC++ Var(flag_objc_call_cxx_cdtors)
1578 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed.
1580 fobjc-direct-dispatch
1581 ObjC ObjC++ Var(flag_objc_direct_dispatch)
1582 Allow fast jumps to the message dispatcher.
1584 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
1585 ; @try, etc.) in source code.
1587 ObjC ObjC++ Var(flag_objc_exceptions)
1588 Enable Objective-C exception and synchronization syntax.
1591 ObjC ObjC++ LTO Var(flag_objc_gc)
1592 Enable garbage collection (GC) in Objective-C/Objective-C++ programs.
1595 ObjC ObjC++ Var(flag_objc_nilcheck,1)
1596 Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.
1598 ; Nonzero means that we generate NeXT setjmp based exceptions.
1599 fobjc-sjlj-exceptions
1600 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
1601 Enable Objective-C setjmp exception handling runtime.
1604 ObjC ObjC++ Var(flag_objc1_only)
1605 Conform to the Objective-C 1.0 language as implemented in GCC 4.0.
1608 C ObjC C++ ObjC++ LTO Var(flag_openacc)
1612 C ObjC C++ ObjC++ LTO Joined Var(flag_openacc_dims)
1613 Specify default OpenACC compute dimensions.
1616 C ObjC C++ ObjC++ LTO Var(flag_openmp)
1617 Enable OpenMP (implies -frecursive in Fortran).
1620 C ObjC C++ ObjC++ Var(flag_openmp_simd)
1621 Enable OpenMP's SIMD directives.
1625 Recognize C++ keywords like \"compl\" and \"xor\".
1629 Does nothing. Preserved for backward compatibility.
1636 Look for and use PCH files even when preprocessing.
1639 C++ ObjC++ Var(flag_permissive)
1640 Downgrade conformance errors to warnings.
1643 C ObjC Var(flag_plan9_extensions)
1644 Enable Plan 9 language extensions.
1648 Treat the input file as already preprocessed.
1650 ftrack-macro-expansion
1651 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1652 ; converted into ftrack-macro-expansion=
1654 ftrack-macro-expansion=
1655 C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
1656 -ftrack-macro-expansion=<0|1|2> Track locations of tokens coming from macro expansion and display them in error messages.
1659 C++ ObjC++ Var(flag_pretty_templates) Init(1)
1660 -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments.
1662 fprintf-return-value
1663 C ObjC C++ ObjC++ LTO Optimization Var(flag_printf_return_value) Init(1)
1664 Treat known sprintf return values as constants.
1666 freplace-objc-classes
1667 ObjC ObjC++ LTO Var(flag_replace_objc_classes)
1668 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime.
1672 Enable automatic template instantiation.
1675 C++ ObjC++ Optimization Var(flag_rtti) Init(1)
1676 Generate run time type descriptor information.
1679 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_enums)
1680 Use the narrowest integer type possible for enumeration types.
1683 C ObjC C++ ObjC++ LTO Optimization Var(flag_short_wchar)
1684 Force the underlying type for \"wchar_t\" to be \"unsigned short\".
1687 C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
1688 When \"signed\" or \"unsigned\" is not given make the bitfield signed.
1691 C ObjC C++ ObjC++ LTO Var(flag_signed_char)
1692 Make \"char\" signed by default.
1695 C++ ObjC++ Var(flag_sized_deallocation) Init(-1)
1696 Enable C++14 sized deallocation support.
1699 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1702 C ObjC Joined RejectNegative Enum(sso_struct) Var(default_sso) Init(SSO_NATIVE)
1703 -fsso-struct=[big-endian|little-endian|native] Set the default scalar storage order.
1706 Name(sso_struct) Type(enum scalar_storage_order_kind) UnknownError(unrecognized scalar storage order value %qs)
1709 Enum(sso_struct) String(big-endian) Value(SSO_BIG_ENDIAN)
1712 Enum(sso_struct) String(little-endian) Value(SSO_LITTLE_ENDIAN)
1715 Enum(sso_struct) String(native) Value(SSO_NATIVE)
1718 C++ ObjC++ Var(flag_detailed_statistics)
1719 Display statistics accumulated during compilation.
1722 C++ ObjC++ Optimization Var(flag_strict_enums)
1723 Assume that values of enumeration type are always within the minimum range of that type.
1726 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1729 C++ ObjC++ Common Alias(fstrong-eval-order=, all, none)
1730 Follow the C++17 evaluation order requirements for assignment expressions,
1731 shift, member function calls, etc.
1734 C++ ObjC++ Common Var(flag_strong_eval_order) Joined Enum(strong_eval_order) RejectNegative Init(-1)
1735 Follow the C++17 evaluation order requirements for assignment expressions,
1736 shift, member function calls, etc.
1739 Name(strong_eval_order) Type(int)
1742 Enum(strong_eval_order) String(none) Value(0)
1745 Enum(strong_eval_order) String(some) Value(1)
1748 Enum(strong_eval_order) String(all) Value(2)
1751 C ObjC C++ ObjC++ Joined RejectNegative UInteger
1752 -ftabstop=<number> Distance between tab stops for column reporting.
1754 ftemplate-backtrace-limit=
1755 C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
1756 Set the maximum number of template instantiation notes for a single warning or error.
1759 C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)
1762 C++ ObjC++ Joined RejectNegative UInteger
1763 -ftemplate-depth=<number> Specify maximum template instantiation depth.
1766 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1769 C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
1770 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics.
1773 C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
1774 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned.
1777 C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
1778 Make \"char\" unsigned by default.
1781 C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
1782 Use __cxa_atexit to register destructors.
1784 fuse-cxa-get-exception-ptr
1785 C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
1786 Use __cxa_get_exception_ptr in exception handling.
1788 fvisibility-inlines-hidden
1790 Marks all inlined functions and methods as having hidden visibility.
1792 fvisibility-ms-compat
1793 C++ ObjC++ Var(flag_visibility_ms_compat)
1794 Changes visibility to match Microsoft Visual Studio by default.
1797 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1798 No longer supported.
1801 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1802 No longer supported.
1805 C++ ObjC++ Var(flag_weak) Init(1)
1806 Emit common-like symbols as weak symbols.
1809 C ObjC C++ ObjC++ Joined RejectNegative
1810 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>.
1813 C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
1814 Generate a #line directive pointing at the current working directory.
1817 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1818 No longer supported.
1821 ObjC ObjC++ Var(flag_zero_link)
1822 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode.
1825 ObjC ObjC++ Driver Var(flag_gen_declaration) RejectNegative
1826 Dump declarations to a .decl file.
1828 femit-struct-debug-baseonly
1830 -femit-struct-debug-baseonly Aggressive reduced debug info for structs.
1832 femit-struct-debug-reduced
1834 -femit-struct-debug-reduced Conservative reduced debug info for structs.
1836 femit-struct-debug-detailed=
1837 C ObjC C++ ObjC++ Joined
1838 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs.
1840 fext-numeric-literals
1841 C++ ObjC++ Var(flag_ext_numeric_literals) Init(1)
1842 Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding
1843 number literal rather than a user-defined number literal.
1846 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1847 -idirafter <dir> Add <dir> to the end of the system include path.
1850 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1851 -imacros <file> Accept definition of macros in <file>.
1854 C ObjC C++ ObjC++ Joined Separate
1855 -imultilib <dir> Set <dir> to be the multilib include subdirectory.
1858 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1859 -include <file> Include the contents of <file> before other files.
1862 C ObjC C++ ObjC++ Joined Separate
1863 -iprefix <path> Specify <path> as a prefix for next two options.
1866 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1867 -isysroot <dir> Set <dir> to be the system root directory.
1870 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1871 -isystem <dir> Add <dir> to the start of the system include path.
1874 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1875 -iquote <dir> Add <dir> to the end of the quote include path.
1878 C ObjC C++ ObjC++ Joined Separate
1879 -iwithprefix <dir> Add <dir> to the end of the system include path.
1882 C ObjC C++ ObjC++ Joined Separate
1883 -iwithprefixbefore <dir> Add <dir> to the end of the main include path.
1886 C Undocumented RejectDriver
1893 Do not search standard system include directories (those specified with -isystem will still be used).
1897 Do not search standard system include directories for C++.
1900 C ObjC C++ ObjC++ Joined Separate
1901 ; Documented in common.opt
1904 C ObjC C++ ObjC++ Alias(Wpedantic)
1905 ; Documented in common.opt
1907 print-objc-runtime-info
1909 Generate C header of platform-specific features.
1913 Remap file names when including files.
1917 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum.
1920 C++ ObjC++ Alias(std=c++98)
1921 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum.
1925 Conform to the ISO 2011 C++ standard.
1928 C++ ObjC++ Alias(std=c++11) Undocumented
1929 Deprecated in favor of -std=c++11.
1932 C++ ObjC++ Alias(std=c++14) Undocumented
1933 Deprecated in favor of -std=c++14.
1937 Conform to the ISO 2014 C++ standard.
1940 C++ ObjC++ Alias(std=c++17) Undocumented
1941 Deprecated in favor of -std=c++17.
1945 Conform to the ISO 2017 C++ standard.
1949 Conform to the ISO 2020(?) C++ draft standard (experimental and incomplete support).
1953 Conform to the ISO 2011 C standard.
1956 C ObjC Alias(std=c11)
1957 Deprecated in favor of -std=c11.
1961 Conform to the ISO 2017 C standard (expected to be published in 2018).
1964 C ObjC Alias(std=c17)
1965 Conform to the ISO 2017 C standard (expected to be published in 2018).
1968 C ObjC Alias(std=c90)
1969 Conform to the ISO 1990 C standard.
1973 Conform to the ISO 1990 C standard.
1977 Conform to the ISO 1999 C standard.
1980 C ObjC Alias(std=c99)
1981 Deprecated in favor of -std=c99.
1985 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1986 corrigendum with GNU extensions.
1989 C++ ObjC++ Alias(std=gnu++98)
1990 Conform to the ISO 1998 C++ standard revised by the 2003 technical
1991 corrigendum with GNU extensions.
1995 Conform to the ISO 2011 C++ standard with GNU extensions.
1998 C++ ObjC++ Alias(std=gnu++11) Undocumented
1999 Deprecated in favor of -std=gnu++11.
2002 C++ ObjC++ Alias(std=gnu++14) Undocumented
2003 Deprecated in favor of -std=gnu++14.
2007 Conform to the ISO 2014 C++ standard with GNU extensions.
2010 C++ ObjC++ Alias(std=gnu++17) Undocumented
2011 Deprecated in favor of -std=gnu++17.
2015 Conform to the ISO 2017 C++ standard with GNU extensions.
2019 Conform to the ISO 2020(?) C++ draft standard with GNU extensions (experimental and incomplete support).
2023 Conform to the ISO 2011 C standard with GNU extensions.
2026 C ObjC Alias(std=gnu11)
2027 Deprecated in favor of -std=gnu11.
2031 Conform to the ISO 2017 C standard (expected to be published in 2018) with GNU extensions.
2034 C ObjC Alias(std=gnu17)
2035 Conform to the ISO 2017 C standard (expected to be published in 2018) with GNU extensions.
2038 C ObjC Alias(std=gnu90)
2039 Conform to the ISO 1990 C standard with GNU extensions.
2043 Conform to the ISO 1990 C standard with GNU extensions.
2047 Conform to the ISO 1999 C standard with GNU extensions.
2050 C ObjC Alias(std=gnu99)
2051 Deprecated in favor of -std=gnu99.
2054 C ObjC Alias(std=c90)
2055 Conform to the ISO 1990 C standard.
2059 Conform to the ISO 1990 C standard as amended in 1994.
2062 C ObjC Alias(std=c99)
2063 Conform to the ISO 1999 C standard.
2066 C ObjC Alias(std=c99)
2067 Deprecated in favor of -std=iso9899:1999.
2070 C ObjC Alias(std=c11)
2071 Conform to the ISO 2011 C standard.
2074 C ObjC Alias(std=c17)
2075 Conform to the ISO 2017 C standard (expected to be published in 2018).
2078 C ObjC Alias(std=c17)
2079 Conform to the ISO 2017 C standard (expected to be published in 2018).
2086 Enable traditional preprocessing.
2090 -trigraphs Support ISO C trigraphs.
2093 C ObjC C++ ObjC++ Var(flag_undef)
2094 Do not predefine system-specific and GCC-specific macros.
2098 ; Documented in common.opt
2102 ; Documented in common.opt
2104 ; This comment is to ensure we retain the blank line above.