linux-common.h (LIBMPX_WRAPPERSSPEC): New.

[thirdparty/gcc.git] / gcc / c-family / c.opt

; Options for the C, ObjC, C++ and ObjC++ front ends.
; Copyright (C) 2003-2015 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
; GCC is free software; you can redistribute it and/or modify it under
; the terms of the GNU General Public License as published by the Free
; Software Foundation; either version 3, or (at your option) any later
; version.
;
; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
; WARRANTY; without even the implied warranty of MERCHANTABILITY or
; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
; for more details.
;
; You should have received a copy of the GNU General Public License
; along with GCC; see the file COPYING3.  If not see
; <http://www.gnu.org/licenses/>.

; See the GCC internals manual for a description of this file's format.

; Please try to keep this file in ASCII collating order.

Language
C

Language
ObjC

Language
C++

Language
ObjC++

-all-warnings
C ObjC C++ ObjC++ Warning Alias(Wall)

-ansi
C ObjC C++ ObjC++ Alias(ansi)

-assert
C ObjC C++ ObjC++ Separate Alias(A) MissingArgError(assertion missing after %qs)

-assert=
C ObjC C++ ObjC++ Joined Alias(A) MissingArgError(assertion missing after %qs)

-comments
C ObjC C++ ObjC++ Alias(C)

-comments-in-macros
C ObjC C++ ObjC++ Alias(CC)

-define-macro
C ObjC C++ ObjC++ Separate Alias(D) MissingArgError(macro name missing after %qs)

-define-macro=
C ObjC C++ ObjC++ Joined Alias(D) MissingArgError(macro name missing after %qs)

-dependencies
C ObjC C++ ObjC++ Alias(M)

-dump
C ObjC C++ ObjC++ Separate Alias(d)

-dump=
C ObjC C++ ObjC++ Joined Alias(d)

-imacros
C ObjC C++ ObjC++ Separate Alias(imacros) MissingArgError(missing filename after %qs)

-imacros=
C ObjC C++ ObjC++ Joined Alias(imacros) MissingArgError(missing filename after %qs)

-include
C ObjC C++ ObjC++ Separate Alias(include) MissingArgError(missing filename after %qs)

-include=
C ObjC C++ ObjC++ Joined Alias(include) MissingArgError(missing filename after %qs)

-include-barrier
C ObjC C++ ObjC++ Alias(I, -)

-include-directory
C ObjC C++ ObjC++ Separate Alias(I) MissingArgError(missing path after %qs)

-include-directory=
C ObjC C++ ObjC++ Joined Alias(I) MissingArgError(missing path after %qs)

-include-directory-after
C ObjC C++ ObjC++ Separate Alias(idirafter) MissingArgError(missing path after %qs)

-include-directory-after=
C ObjC C++ ObjC++ Joined Alias(idirafter) MissingArgError(missing path after %qs)

-include-prefix
C ObjC C++ ObjC++ Separate Alias(iprefix)

-include-prefix=
C ObjC C++ ObjC++ JoinedOrMissing Alias(iprefix)

-include-with-prefix
C ObjC C++ ObjC++ Separate Alias(iwithprefix)

-include-with-prefix=
C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)

-include-with-prefix-after
C ObjC C++ ObjC++ Separate Alias(iwithprefix)

-include-with-prefix-after=
C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)

-include-with-prefix-before
C ObjC C++ ObjC++ Separate Alias(iwithprefixbefore)

-include-with-prefix-before=
C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefixbefore)

-no-integrated-cpp
Driver Alias(no-integrated-cpp)

-no-line-commands
C ObjC C++ ObjC++ Alias(P)

-no-standard-includes
C ObjC C++ ObjC++ Alias(nostdinc)

-no-warnings
C ObjC C++ ObjC++ Alias(w)

-output
C ObjC C++ ObjC++ Separate Alias(o)

-output=
C ObjC C++ ObjC++ Joined Alias(o)

-output-pch=
C ObjC C++ ObjC++ Joined Separate

-pedantic
C ObjC C++ ObjC++ Alias(pedantic)

-preprocess
C ObjC C++ ObjC++ Undocumented Alias(E)

-print-missing-file-dependencies
C ObjC C++ ObjC++ Alias(MG)

-trace-includes
C ObjC C++ ObjC++ Alias(H)

-traditional
Driver Alias(traditional)

-traditional-cpp
C ObjC C++ ObjC++ Alias(traditional-cpp)

-trigraphs
C ObjC C++ ObjC++ Alias(trigraphs)

-undefine-macro
C ObjC C++ ObjC++ Separate Alias(U) MissingArgError(macro name missing after %qs)

-undefine-macro=
C ObjC C++ ObjC++ Joined Alias(U) MissingArgError(macro name missing after %qs)

-user-dependencies
C ObjC C++ ObjC++ Alias(MM)

-verbose
Common C ObjC C++ ObjC++ Alias(v)

-write-dependencies
C ObjC C++ ObjC++ NoDriverArg Separate Alias(MD) MissingArgError(missing filename after %qs)

-write-user-dependencies
C ObjC C++ ObjC++ NoDriverArg Separate Alias(MMD) MissingArgError(missing filename after %qs)

A
C ObjC C++ ObjC++ Joined Separate MissingArgError(assertion missing after %qs)
-A<question>=<answer>	Assert the <answer> to <question>.  Putting '-' before <question> disables the <answer> to <question>

C
C ObjC C++ ObjC++
Do not discard comments

CC
C ObjC C++ ObjC++
Do not discard comments in macro expansions

D
C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
-D<macro>[=<val>]	Define a <macro> with <val> as its value.  If just <macro> is given, <val> is taken to be 1

E
C ObjC C++ ObjC++ Undocumented Var(flag_preprocess_only)

F
Driver C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
-F <dir>	Add <dir> to the end of the main framework include path

H
C ObjC C++ ObjC++
Print the name of header files as they are used

I
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
-I <dir>	Add <dir> to the end of the main include path

M
C ObjC C++ ObjC++
Generate make dependencies

MD
C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
Generate make dependencies and compile

MF
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
-MF <file>	Write dependency output to the given file

MG
C ObjC C++ ObjC++
Treat missing header files as generated files

MM
C ObjC C++ ObjC++
Like -M but ignore system header files

MMD
C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
Like -MD but ignore system header files

MP
C ObjC C++ ObjC++
Generate phony targets for all headers

MQ
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
-MQ <target>	Add a MAKE-quoted target

MT
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
-MT <target>	Add an unquoted target

P
C ObjC C++ ObjC++
Do not generate #line directives

U
C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
-U<macro>	Undefine <macro>

Wabi
C ObjC C++ ObjC++ LTO Var(warn_abi) Warning
Warn about things that will change when compiling with an ABI-compliant compiler

Wabi=
C ObjC C++ ObjC++ LTO Joined RejectNegative UInteger Warning
Warn about things that change between the current -fabi-version and the specified version

Wabi-tag
C++ ObjC++ Var(warn_abi_tag) Warning
Warn if a subobject has an abi_tag attribute that the complete object type does not have

Wpsabi
C ObjC C++ ObjC++ LTO Var(warn_psabi) Init(1) Undocumented LangEnabledBy(C ObjC C++ ObjC++,Wabi)

Waddress
C ObjC C++ ObjC++ Var(warn_address) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about suspicious uses of memory addresses

Wall
C ObjC C++ ObjC++ Warning
Enable most warning messages

Warray-bounds
LangEnabledBy(C ObjC C++ ObjC++,Wall)
; in common.opt

Warray-bounds=
LangEnabledBy(C ObjC C++ ObjC++,Wall,1,0)
; in common.opt

Wassign-intercept
ObjC ObjC++ Var(warn_assign_intercept) Warning
Warn whenever an Objective-C assignment is being intercepted by the garbage collector

Wbad-function-cast
C ObjC Var(warn_bad_function_cast) Warning
Warn about casting functions to incompatible types

Wbool-compare
C ObjC C++ ObjC++ Var(warn_bool_compare) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about boolean expression compared with an integer value different from true/false

Wbuiltin-macro-redefined
C ObjC C++ ObjC++ CPP(warn_builtin_macro_redefined) CppReason(CPP_W_BUILTIN_MACRO_REDEFINED) Var(cpp_warn_builtin_macro_redefined) Init(1) Warning
Warn when a built-in preprocessor macro is undefined or redefined

Wc90-c99-compat
C ObjC CPP(cpp_warn_c90_c99_compat) CppReason(CPP_W_C90_C99_COMPAT) Var(warn_c90_c99_compat) Init(-1) Warning
Warn about features not present in ISO C90, but present in ISO C99

Wc99-c11-compat
C ObjC Var(warn_c99_c11_compat) Init(-1) Warning
Warn about features not present in ISO C99, but present in ISO C11

Wc++-compat
C ObjC Var(warn_cxx_compat) CPP(warn_cxx_operator_names) CppReason(CPP_W_CXX_OPERATOR_NAMES) Init(0) Warning
Warn about C constructs that are not in the common subset of C and C++

Wc++0x-compat
C++ ObjC++ Var(warn_cxx0x_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
Deprecated in favor of -Wc++11-compat

Wc++11-compat
C++ ObjC++ Warning Alias(Wc++0x-compat)
Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 2011

Wc++14-compat
C++ ObjC++ Var(warn_cxx14_compat) Warning LangEnabledBy(C++ ObjC++,Wall)
Warn about C++ constructs whose meaning differs between ISO C++ 2011 and ISO C++ 2014

Wcast-qual
C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
Warn about casts which discard qualifiers

Wchar-subscripts
C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about subscripts whose type is \"char\"

Wchkp
C ObjC C++ ObjC++ Var(warn_chkp) Warning EnabledBy(Wall)
Warn about memory access errors found by Pointer Bounds Checker

Wclobbered
C ObjC C++ ObjC++ Var(warn_clobbered) Warning EnabledBy(Wextra)
Warn about variables that might be changed by \"longjmp\" or \"vfork\"

Wcomment
C ObjC C++ ObjC++ CPP(warn_comments) CppReason(CPP_W_COMMENTS) Var(cpp_warn_comment) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about possibly nested block comments, and C++ comments spanning more than one physical line

Wcomments
C ObjC C++ ObjC++ Warning Alias(Wcomment)
Synonym for -Wcomment

Wconditionally-supported
C++ ObjC++ Var(warn_conditionally_supported) Warning
Warn for conditionally-supported constructs

Wconversion
C ObjC C++ ObjC++ Var(warn_conversion) Warning
Warn for implicit type conversions that may change a value

Wconversion-null
C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
Warn for converting NULL from/to a non-pointer type

Wcpp
C ObjC C++ ObjC++ CppReason(CPP_W_WARNING_DIRECTIVE)
; Documented in common.opt

Wctor-dtor-privacy
C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
Warn when all constructors and destructors are private

Wdate-time
C ObjC C++ ObjC++ CPP(warn_date_time) CppReason(CPP_W_DATE_TIME) Var(cpp_warn_date_time) Init(0) Warning
Warn about __TIME__, __DATE__ and __TIMESTAMP__ usage

Wdeclaration-after-statement
C ObjC Var(warn_declaration_after_statement) Init(-1) Warning
Warn when a declaration is found after a statement

Wdelete-incomplete
C++ ObjC++ Var(warn_delete_incomplete) Init(1) Warning
Warn when deleting a pointer to incomplete type

Wdelete-non-virtual-dtor
C++ ObjC++ Var(warn_delnonvdtor) Warning LangEnabledBy(C++ ObjC++,Wall || Weffc++)
Warn about deleting polymorphic objects with non-virtual destructors

Wdeprecated
C C++ ObjC ObjC++ CPP(cpp_warn_deprecated) CppReason(CPP_W_DEPRECATED) Var(warn_deprecated) Init(1) Warning
Warn if a deprecated compiler feature, class, method, or field is used

Wdesignated-init
C ObjC Var(warn_designated_init) Init(1) Warning
Warn about positional initialization of structs requiring designated initializers

Wdiscarded-array-qualifiers
C ObjC Var(warn_discarded_array_qualifiers) Init(1) Warning
Warn if qualifiers on arrays which are pointer targets are discarded

Wdiscarded-qualifiers
C ObjC Var(warn_discarded_qualifiers) Init(1) Warning
Warn if type qualifiers on pointers are discarded

Wdiv-by-zero
C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
Warn about compile-time integer division by zero

Weffc++
C++ ObjC++ Var(warn_ecpp) Warning
Warn about violations of Effective C++ style rules

Wempty-body
C ObjC C++ ObjC++ Var(warn_empty_body) Warning EnabledBy(Wextra)
Warn about an empty body in an if or else statement

Wendif-labels
C ObjC C++ ObjC++ CPP(warn_endif_labels) CppReason(CPP_W_ENDIF_LABELS) Var(cpp_warn_endif_labels) Init(1) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
Warn about stray tokens after #elif and #endif

Wenum-compare
C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning LangEnabledBy(C ObjC,Wall || Wc++-compat)
Warn about comparison of different enum types

Werror
C ObjC C++ ObjC++
; Documented in common.opt

Werror-implicit-function-declaration
C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
This switch is deprecated; use -Werror=implicit-function-declaration instead

Wfloat-conversion
C ObjC C++ ObjC++ Var(warn_float_conversion) LangEnabledBy(C ObjC C++ ObjC++,Wconversion)
Warn for implicit type conversions that cause loss of floating point precision

Wfloat-equal
C ObjC C++ ObjC++ Var(warn_float_equal) Warning
Warn if testing floating point numbers for equality

Wformat
C ObjC C++ ObjC++ Warning Alias(Wformat=, 1, 0)
Warn about printf/scanf/strftime/strfmon format string anomalies

Wformat-contains-nul
C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
Warn about format strings that contain NUL bytes

Wformat-extra-args
C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 1, 0)
Warn if passing too many arguments to a function for its format string

Wformat-nonliteral
C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
Warn about format strings that are not literals

Wformat-security
C ObjC C++ ObjC++ Var(warn_format_security) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=, warn_format >= 2, 0)
Warn about possible security problems with format functions

Wformat-signedness
C ObjC C++ ObjC++ Var(warn_format_signedness) Warning
Warn about sign differences with format functions

Wformat-y2k
C ObjC C++ ObjC++ Var(warn_format_y2k) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 2, 0)
Warn about strftime formats yielding 2-digit years

Wformat-zero-length
C ObjC C++ ObjC++ Var(warn_format_zero_length) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1, 0)
Warn about zero-length formats

Wformat=
C ObjC C++ ObjC++ Joined RejectNegative UInteger Var(warn_format) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
Warn about printf/scanf/strftime/strfmon format string anomalies

Wignored-qualifiers
C C++ Var(warn_ignored_qualifiers) Warning EnabledBy(Wextra)
Warn whenever type qualifiers are ignored.

Wincompatible-pointer-types
C ObjC Var(warn_incompatible_pointer_types) Init(1) Warning
Warn when there is a conversion between pointers that have incompatible types

Winit-self
C ObjC C++ ObjC++ Var(warn_init_self) Warning LangEnabledBy(C++ ObjC++,Wall)
Warn about variables which are initialized to themselves

Wimplicit
C ObjC Var(warn_implicit) Warning LangEnabledBy(C ObjC,Wall)
Warn about implicit declarations

Wdouble-promotion
C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
Warn about implicit conversions from \"float\" to \"double\"

Wimplicit-function-declaration
C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
Warn about implicit function declarations

Wimplicit-int
C ObjC Var(warn_implicit_int) Init(-1) Warning LangEnabledBy(C ObjC,Wimplicit)
Warn when a declaration does not specify a type

Wimport
C ObjC C++ ObjC++ Undocumented Ignore

Winherited-variadic-ctor
C++ ObjC++ Var(warn_inh_var_ctor) Init(1) Warning
Warn about C++11 inheriting constructors when the base has a variadic constructor

Wint-conversion
C ObjC Var(warn_int_conversion) Init(1) Warning
Warn about incompatible integer to pointer and pointer to integer conversions

Wint-to-pointer-cast
C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
Warn when there is a cast to a pointer from an integer of a different size

Winvalid-offsetof
C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
Warn about invalid uses of the \"offsetof\" macro

Winvalid-pch
C ObjC C++ ObjC++ CPP(warn_invalid_pch) CppReason(CPP_W_INVALID_PCH) Var(cpp_warn_invalid_pch) Init(0) Warning
Warn about PCH files that are found but not used

Wjump-misses-init
C ObjC Var(warn_jump_misses_init) Warning LangEnabledby(C ObjC,Wc++-compat)
Warn when a jump misses a variable initialization

Wliteral-suffix
C++ ObjC++ CPP(warn_literal_suffix) CppReason(CPP_W_LITERAL_SUFFIX) Var(cpp_warn_literal_suffix) Init(1) Warning
Warn when a string or character literal is followed by a ud-suffix which does not begin with an underscore.

Wlogical-op
C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning 
Warn when a logical operator is suspiciously always evaluating to true or false

Wlogical-not-parentheses
C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn when logical not is used on the left hand side operand of a comparison

Wlong-long
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)
Do not warn about using \"long long\" when -pedantic

Wmain
C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning LangEnabledBy(C ObjC,Wall, 2, 0)
Warn about suspicious declarations of \"main\"

Wmain
LangEnabledBy(C ObjC C++ ObjC++,Wpedantic, 2, 0)
;

Wmemset-transposed-args
C ObjC C++ ObjC++ Var(warn_memset_transposed_args) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about suspicious calls to memset where the third argument is constant literal zero and the second is not

Wmissing-braces
C ObjC C++ ObjC++ Var(warn_missing_braces) Warning LangEnabledBy(C ObjC,Wall)
Warn about possibly missing braces around initializers

Wmissing-declarations
C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
Warn about global functions without previous declarations

Wmissing-field-initializers
C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Warning EnabledBy(Wextra)
Warn about missing fields in struct initializers

Wsized-deallocation
C++ ObjC++ Var(warn_sized_deallocation) Warning EnabledBy(Wextra)
Warn about missing sized deallocation functions

Wsizeof-pointer-memaccess
C ObjC C++ ObjC++ Var(warn_sizeof_pointer_memaccess) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about suspicious length parameters to certain string functions if the argument uses sizeof

Wsizeof-array-argument
C ObjC C++ ObjC++ Var(warn_sizeof_array_argument) Warning Init(1)
Warn when sizeof is applied on a parameter declared as an array

Wsuggest-attribute=format
C ObjC C++ ObjC++ Var(warn_suggest_attribute_format) Warning
Warn about functions which might be candidates for format attributes

Wsuggest-override
C++ ObjC++ Var(warn_override) Warning
Suggest that the override keyword be used when the declaration of a virtual
function overrides another.

Wswitch
C ObjC C++ ObjC++ Var(warn_switch) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about enumerated switches, with no default, missing a case

Wswitch-default
C ObjC C++ ObjC++ Var(warn_switch_default) Warning
Warn about enumerated switches missing a \"default:\" statement

Wswitch-enum
C ObjC C++ ObjC++ Var(warn_switch_enum) Warning
Warn about all enumerated switches missing a specific case

Wswitch-bool
C ObjC C++ ObjC++ Var(warn_switch_bool) Warning Init(1)
Warn about switches with boolean controlling expression

Wmissing-format-attribute
C ObjC C++ ObjC++ Alias(Wsuggest-attribute=format)
;

Wmissing-include-dirs
C ObjC C++ ObjC++ CPP(warn_missing_include_dirs) CppReason(CPP_W_MISSING_INCLUDE_DIRS) Var(cpp_warn_missing_include_dirs) Init(0) Warning
Warn about user-specified include directories that do not exist

Wmissing-parameter-type
C ObjC Var(warn_missing_parameter_type) Warning EnabledBy(Wextra)
Warn about function parameters declared without a type specifier in K&R-style functions

Wmissing-prototypes
C ObjC Var(warn_missing_prototypes) Warning
Warn about global functions without prototypes

Wmudflap
C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

Wmultichar
C ObjC C++ ObjC++ CPP(warn_multichar) CppReason(CPP_W_MULTICHAR) Var(cpp_warn_multichar) Init(0) Warning
Warn about use of multi-character character constants

Wnarrowing
C ObjC C++ ObjC++ Warning Var(warn_narrowing) Init(-1) LangEnabledBy(C++ ObjC++,Wall || Wc++0x-compat)
Warn about narrowing conversions within { } that are ill-formed in C++11

Wnested-externs
C ObjC Var(warn_nested_externs) Warning
Warn about \"extern\" declarations not at file scope

Wnoexcept
C++ ObjC++ Var(warn_noexcept) Warning
Warn when a noexcept expression evaluates to false even though the expression can't actually throw

Wnon-template-friend
C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
Warn when non-templatized friend functions are declared within a template

Wnon-virtual-dtor
C++ ObjC++ Var(warn_nonvdtor) Warning LangEnabledBy(C++ ObjC++,Weffc++)
Warn about non-virtual destructors

Wnonnull
C ObjC C++ ObjC++ Var(warn_nonnull) Warning LangEnabledBy(C ObjC C++ ObjC++,Wformat=,warn_format >= 1,0)
Warn about NULL being passed to argument slots marked as requiring non-NULL

Wnonnull
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
;

Wnormalized
C ObjC C++ ObjC++ Alias(Wnormalized=,nfc,none)
;

Wnormalized=
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)
-Wnormalized=<none|id|nfc|nfkc>	Warn about non-normalised Unicode strings

; Required for these enum values.
SourceInclude
cpplib.h

Enum
Name(cpp_normalize_level) Type(int) UnknownError(argument %qs to %<-Wnormalized%> not recognized)

EnumValue
Enum(cpp_normalize_level) String(none) Value(normalized_none)

EnumValue
Enum(cpp_normalize_level) String(nfkc) Value(normalized_KC)

EnumValue
Enum(cpp_normalize_level) String(id) Value(normalized_identifier_C)

EnumValue
Enum(cpp_normalize_level) String(nfc) Value(normalized_C)

Wold-style-cast
C++ ObjC++ Var(warn_old_style_cast) Warning
Warn if a C-style cast is used in a program

Wold-style-declaration
C ObjC Var(warn_old_style_declaration) Warning EnabledBy(Wextra)
Warn for obsolescent usage in a declaration

Wold-style-definition
C ObjC Var(warn_old_style_definition) Warning
Warn if an old-style parameter definition is used

Wopenmp-simd
C C++ Var(warn_openmp_simd) Warning LangEnabledBy(C C++,Wall)
Warn if a simd directive is overridden by the vectorizer cost model

Woverlength-strings
C ObjC C++ ObjC++ Var(warn_overlength_strings) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
Warn if a string is longer than the maximum portable length specified by the standard

Woverloaded-virtual
C++ ObjC++ Var(warn_overloaded_virtual) Warning
Warn about overloaded virtual function names

Woverride-init
C ObjC Var(warn_override_init) Warning EnabledBy(Wextra)
Warn about overriding initializers without side effects

Wpacked-bitfield-compat
C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
Warn about packed bit-fields whose offset changed in GCC 4.4

Wparentheses
C ObjC C++ ObjC++ Var(warn_parentheses) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about possibly missing parentheses

Wpedantic
C ObjC C++ ObjC++ CPP(cpp_pedantic) CppReason(CPP_W_PEDANTIC) Warning
; Documented in common.opt

Wpmf-conversions
C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
Warn when converting the type of pointers to member functions

Wpointer-arith
C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic)
Warn about function pointer arithmetic

Wpointer-sign
C ObjC Var(warn_pointer_sign) Warning LangEnabledBy(C ObjC,Wall || Wpedantic)
Warn when a pointer differs in signedness in an assignment

Wpointer-to-int-cast
C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
Warn when a pointer is cast to an integer of a different size

Wpragmas
C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
Warn about misuses of pragmas

Wproperty-assign-default
ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
Warn if a property for an Objective-C object has no assign semantics specified

Wprotocol
ObjC ObjC++ Var(warn_protocol) Init(1) Warning
Warn if inherited methods are unimplemented

Wredundant-decls
C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
Warn about multiple declarations of the same object

Wreorder
C++ ObjC++ Var(warn_reorder) Warning LangEnabledBy(C++ ObjC++,Wall)
Warn when the compiler reorders code

Wreturn-type
C ObjC C++ ObjC++ Var(warn_return_type) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)

Wselector
ObjC ObjC++ Var(warn_selector) Warning
Warn if a selector has multiple methods

Wsequence-point
C ObjC C++ ObjC++ Var(warn_sequence_point) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn about possible violations of sequence point rules

Wshadow-ivar
ObjC ObjC++ Var(warn_shadow_ivar) EnabledBy(Wshadow) Init(1) Warning
Warn if a local declaration hides an instance variable

Wshift-count-negative
C ObjC C++ ObjC++ Var(warn_shift_count_negative) Init(1) Warning
Warn if shift count is negative

Wshift-count-overflow
C ObjC C++ ObjC++ Var(warn_shift_count_overflow) Init(1) Warning
Warn if shift count >= width of type

Wsign-compare
C ObjC C++ ObjC++ Var(warn_sign_compare) Warning LangEnabledBy(C++ ObjC++,Wall)
Warn about signed-unsigned comparisons

Wsign-compare
C ObjC C++ ObjC++ EnabledBy(Wextra)
;

Wsign-conversion
C ObjC C++ ObjC++ Var(warn_sign_conversion) LangEnabledBy(C ObjC,Wconversion)
Warn for implicit type conversions between signed and unsigned integers

Wsign-promo
C++ ObjC++ Var(warn_sign_promo) Warning
Warn when overload promotes from unsigned to signed

Wstrict-null-sentinel
C++ ObjC++ Warning Var(warn_strict_null_sentinel)
Warn about uncasted NULL used as sentinel

Wstrict-prototypes
C ObjC Var(warn_strict_prototypes) Warning
Warn about unprototyped function declarations

Wstrict-aliasing=
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 3, 0)
;

Wstrict-overflow=
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
;

Wstrict-selector-match
ObjC ObjC++ Var(warn_strict_selector_match) Warning
Warn if type signatures of candidate methods do not match exactly

Wsync-nand
C C++ Var(warn_sync_nand) Init(1) Warning
Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used

Wsynth
C++ ObjC++ Var(warn_synth) Warning
Deprecated.  This switch has no effect

Wsystem-headers
C ObjC C++ ObjC++ Warning
; Documented in common.opt

Wtraditional
C ObjC CPP(cpp_warn_traditional) CppReason(CPP_W_TRADITIONAL) Var(warn_traditional) Init(0) Warning
Warn about features not present in traditional C

Wtraditional-conversion
C ObjC Var(warn_traditional_conversion) Warning
Warn of prototypes causing type conversions different from what would happen in the absence of prototype

Wtrigraphs
C ObjC C++ ObjC++ CPP(warn_trigraphs) CppReason(CPP_W_TRIGRAPHS) Var(cpp_warn_trigraphs) Init(2) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn if trigraphs are encountered that might affect the meaning of the program

Wundeclared-selector
ObjC ObjC++ Var(warn_undeclared_selector) Warning
Warn about @selector()s without previously declared methods

Wundef
C ObjC C++ ObjC++ CPP(warn_undef) CppReason(CPP_W_UNDEF) Var(cpp_warn_undef) Init(0) Warning
Warn if an undefined macro is used in an #if directive

Wuninitialized
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
;

Wmaybe-uninitialized
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
;

Wunknown-pragmas
C ObjC C++ ObjC++ Warning Var(warn_unknown_pragmas) LangEnabledBy(C ObjC C++ ObjC++,Wall, 1, 0)
Warn about unrecognized pragmas

Wunsuffixed-float-constants
C ObjC Var(warn_unsuffixed_float_constants) Warning
Warn about unsuffixed float constants

Wunused
C ObjC C++ ObjC++ LangEnabledBy(C ObjC C++ ObjC++,Wall)
; documented in common.opt

Wunused-local-typedefs
C ObjC C++ ObjC++ Var(warn_unused_local_typedefs) Warning EnabledBy(Wunused)
Warn when typedefs locally defined in a function are not used

Wunused-macros
C ObjC C++ ObjC++ CppReason(CPP_W_UNUSED_MACROS) Var(cpp_warn_unused_macros) Warning
Warn about macros defined in the main file that are not used

Wunused-result
C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value

Wvariadic-macros
C ObjC C++ ObjC++ CPP(warn_variadic_macros) CppReason(CPP_W_VARIADIC_MACROS) Var(cpp_warn_variadic_macros) Init(0) Warning LangEnabledBy(C ObjC C++ ObjC++,Wpedantic || Wtraditional)
Warn about using variadic macros

Wvarargs
C ObjC C++ ObjC++ Warning Var(warn_varargs) Init(1)
Warn about questionable usage of the macros used to retrieve variable arguments

Wvla
C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
Warn if a variable length array is used

Wvolatile-register-var
C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall)
Warn when a register variable is declared volatile

Wvirtual-move-assign
C++ ObjC++ Var(warn_virtual_move_assign) Warning Init(1)
Warn if a virtual base has a non-trivial move assignment operator

Wwrite-strings
C ObjC C++ ObjC++ Var(warn_write_strings) Warning
In C++, nonzero means warn about deprecated conversion from string literals to 'char *'.  In C, similar warning, except that the conversion is of course not deprecated by the ISO C standard.

Wzero-as-null-pointer-constant
C++ ObjC++ Var(warn_zero_as_null_pointer_constant) Warning
Warn when a literal '0' is used as null pointer

Wuseless-cast
C++ ObjC++ Var(warn_useless_cast) Warning
Warn about useless casts

ansi
C ObjC C++ ObjC++
A synonym for -std=c89 (for C) or -std=c++98 (for C++)

d
C ObjC C++ ObjC++ Joined
; Documented in common.opt.  FIXME - what about -dI, -dD, -dN and -dD?

fabi-compat-version=
C++ ObjC++ Joined RejectNegative UInteger Var(flag_abi_compat_version) Init(-1)
The version of the C++ ABI used for -Wabi warnings and link compatibility aliases

faccess-control
C++ ObjC++ Var(flag_access_control) Init(1)
Enforce class member access control semantics

fada-spec-parent=
C ObjC C++ ObjC++ RejectNegative Joined Var(ada_specs_parent)
-fada-spec-parent=unit  Dump Ada specs as child units of given parent

fall-virtual
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fallow-parameterless-variadic-functions
C ObjC Var(flag_allow_parameterless_variadic_functions)
Allow variadic functions without named parameter

falt-external-templates
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
No longer supported

fasm
C ObjC C++ ObjC++ Var(flag_no_asm, 0)
Recognize the \"asm\" keyword

; Define extra predefined macros for use in libgcc.
fbuilding-libgcc
C ObjC C++ ObjC++ Undocumented Var(flag_building_libgcc)

fbuiltin
C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
Recognize built-in functions

fbuiltin-
C ObjC C++ ObjC++ Joined

fcanonical-system-headers
C ObjC C++ ObjC++
Where shorter, use canonicalized paths to systems headers.

fcheck-pointer-bounds
Common Report Var(flag_check_pointer_bounds)
Add Pointer Bounds Checker instrumentation.  fchkp-* flags are used to
control instrumentation.  Currently available for C, C++ and ObjC.

fchkp-check-incomplete-type
C ObjC C++ ObjC++ Report Var(flag_chkp_incomplete_type) Init(1)
Generate pointer bounds checks for variables with incomplete type

fchkp-zero-input-bounds-for-main
C ObjC C++ ObjC++ Report Var(flag_chkp_zero_input_bounds_for_main) Init(0)
Use zero bounds for all incoming arguments in 'main' function.  It helps when
instrumented binaries are used with legacy libs.

fchkp-first-field-has-own-bounds
C ObjC C++ ObjC++ RejectNegative Report Var(flag_chkp_first_field_has_own_bounds)
Forces Pointer Bounds Checker to use narrowed bounds for address of the first
field in the structure.  By default pointer to the first field has the same
bounds as pointer to the whole structure.

fchkp-narrow-bounds
C ObjC C++ ObjC++ Report Var(flag_chkp_narrow_bounds) Init(1)
Control how Pointer Bounds Checker handle pointers to object fields.  When
narrowing is on, field bounds are used.  Otherwise full object bounds are used.

fchkp-narrow-to-innermost-array
C ObjC C++ ObjC++ RejectNegative Report Var(flag_chkp_narrow_to_innermost_arrray)
Forces Pointer Bounds Checker to use bounds of the innermost arrays in case of
nested static arryas access.  By default outermost array is used.

fchkp-optimize
C ObjC C++ ObjC++ LTO Report Var(flag_chkp_optimize) Init(-1)
Allow Pointer Bounds Checker optimizations.  By default allowed
on optimization levels >0.

fchkp-use-fast-string-functions
C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_fast_string_functions) Init(0)
Allow to use *_nobnd versions of string functions by Pointer Bounds Checker.

fchkp-use-nochk-string-functions
C ObjC C++ ObjC++ LTO Report Var(flag_chkp_use_nochk_string_functions) Init(0)
Allow to use *_nochk versions of string functions by Pointer Bounds Checker.

fchkp-use-static-bounds
C ObjC C++ ObjC++ Report Var(flag_chkp_use_static_bounds) Init(1)
Use statically initialized variable for vars bounds instead of
generating them each time it is required.

fchkp-use-static-const-bounds
C ObjC C++ ObjC++ Report Var(flag_chkp_use_static_const_bounds) Init(-1)
Use statically initialized variable for constant bounds instead of
generating them each time it is required.

fchkp-treat-zero-dynamic-size-as-infinite
C ObjC C++ ObjC++ Report Var(flag_chkp_zero_dynamic_size_as_infinite) Init(0)
With this option zero size obtained dynamically for objects with
incomplete type will be treated as infinite.

fchkp-check-read
C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_read) Init(1)
Generate checks for all read accesses to memory.

fchkp-check-write
C ObjC C++ ObjC++ LTO Report Var(flag_chkp_check_write) Init(1)
Generate checks for all write accesses to memory.

fchkp-store-bounds
C ObjC C++ ObjC++ LTO Report Var(flag_chkp_store_bounds) Init(1)
Generate bounds stores for pointer writes.

fchkp-instrument-calls
C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_calls) Init(1)
Generate bounds passing for calls.

fchkp-instrument-marked-only
C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_marked_only) Init(0)
Instrument only functions marked with bnd_instrument attribute.

static-libmpx
Driver

static-libmpxwrappers
Driver

fcilkplus
C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
Enable Cilk Plus

fcond-mismatch
C ObjC C++ ObjC++
Allow the arguments of the '?' operator to have different types

fconserve-space
C++ ObjC++ Var(flag_conserve_space)
Does nothing.  Preserved for backward compatibility.

fconstant-string-class=
ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
-fconst-string-class=<name>	Use class <name> for constant strings

fconstexpr-depth=
C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
-fconstexpr-depth=<number>	Specify maximum constexpr recursion depth

fdebug-cpp
C ObjC C++ ObjC++
Emit debug annotations during preprocessing

fdeduce-init-list
C++ ObjC++ Var(flag_deduce_init_list) Init(0)
-fdeduce-init-list	enable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list

fdeclone-ctor-dtor
C++ ObjC++ Var(flag_declone_ctor_dtor) Init(-1)
Factor complex constructors and destructors to favor space over speed

fdefault-inline
C++ ObjC++ Ignore
Does nothing.  Preserved for backward compatibility.

fdirectives-only
C ObjC C++ ObjC++
Preprocess directives only.

fdollars-in-identifiers
C ObjC C++ ObjC++
Permit '$' as an identifier character

fdump-ada-spec
C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec)
Write all declarations as Ada code transitively

fdump-ada-spec-slim
C ObjC C++ ObjC++ RejectNegative Var(flag_dump_ada_spec_slim)
Write all declarations as Ada code for the given file only

felide-constructors
C++ ObjC++ Var(flag_elide_constructors) Init(1)

fenforce-eh-specs
C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
Generate code to check exception specifications

fenum-int-equiv
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fexec-charset=
C ObjC C++ ObjC++ Joined RejectNegative
-fexec-charset=<cset>	Convert all strings and character constants to character set <cset>

fextended-identifiers
C ObjC C++ ObjC++
Permit universal character names (\\u and \\U) in identifiers

finput-charset=
C ObjC C++ ObjC++ Joined RejectNegative
-finput-charset=<cset>	Specify the default character set for source files

fextern-tls-init
C++ ObjC++ Var(flag_extern_tls_init) Init(-1)
Support dynamic initialization of thread-local variables in a different translation unit

fexternal-templates
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

ffor-scope
C++ ObjC++ Var(flag_new_for_scope) Init(1)
Scope of for-init-statement variables is local to the loop

ffreestanding
C ObjC C++ ObjC++
Do not assume that standard C libraries and \"main\" exist

fgnu-keywords
C++ ObjC++ Var(flag_no_gnu_keywords, 0)
Recognize GNU-defined keywords

fgnu-runtime
ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime,0) Init(NEXT_OBJC_RUNTIME)
Generate code for GNU runtime environment

fgnu89-inline
C ObjC Var(flag_gnu89_inline) Init(-1)
Use traditional GNU semantics for inline functions

fguiding-decls
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fhandle-exceptions
C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})

fhonor-std
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fhosted
C ObjC
Assume normal C execution environment

fhuge-objects
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
No longer supported

fimplement-inlines
C++ ObjC++ Var(flag_implement_inlines) Init(1)
Export functions even if they can be inlined

fimplicit-inline-templates
C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
Emit implicit instantiations of inline templates

fimplicit-templates
C++ ObjC++ Var(flag_implicit_templates) Init(1)
Emit implicit instantiations of templates

ffriend-injection
C++ ObjC++ Var(flag_friend_injection)
Inject friend functions into enclosing namespace

fkeep-inline-dllexport
C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
Don't emit dllexported inline functions unless needed

flabels-ok
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

flax-vector-conversions
C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.

fms-extensions
C ObjC C++ ObjC++ Var(flag_ms_extensions)
Don't warn about uses of Microsoft extensions

fmudflap
C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fmudflapth
C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fmudflapir
C ObjC C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fname-mangling-version-
C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)

fnew-abi
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fnext-runtime
ObjC ObjC++ LTO Report RejectNegative Var(flag_next_runtime)
Generate code for NeXT (Apple Mac OS X) runtime environment

fnil-receivers
ObjC ObjC++ Var(flag_nil_receivers) Init(1)
Assume that receivers of Objective-C messages may be nil

flocal-ivars
ObjC ObjC++ Var(flag_local_ivars) Init(1)
Allow access to instance variables as if they were local declarations within instance method implementations.

fivar-visibility=
ObjC ObjC++ Joined RejectNegative Enum(ivar_visibility) Var(default_ivar_visibility) Init(IVAR_VISIBILITY_PROTECTED)
-fvisibility=[private|protected|public|package]	Set the default symbol visibility

Enum
Name(ivar_visibility) Type(enum ivar_visibility) UnknownError(unrecognized ivar visibility value %qs)

EnumValue
Enum(ivar_visibility) String(private) Value(IVAR_VISIBILITY_PRIVATE)

EnumValue
Enum(ivar_visibility) String(protected) Value(IVAR_VISIBILITY_PROTECTED)

EnumValue
Enum(ivar_visibility) String(public) Value(IVAR_VISIBILITY_PUBLIC)

EnumValue
Enum(ivar_visibility) String(package) Value(IVAR_VISIBILITY_PACKAGE)

fnonansi-builtins
C++ ObjC++ Var(flag_no_nonansi_builtin, 0)

fnonnull-objects
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fnothrow-opt
C++ ObjC++ Optimization Var(flag_nothrow_opt)
Treat a throw() exception specification as noexcept to improve code size

fobjc-abi-version=
ObjC ObjC++ LTO Joined Report RejectNegative UInteger Var(flag_objc_abi)
Specify which ABI to use for Objective-C family code and meta-data generation.

; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
; to initialize any non-POD ivars in Objective-C++ classes.
fobjc-call-cxx-cdtors
ObjC++ Var(flag_objc_call_cxx_cdtors)
Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed

fobjc-direct-dispatch
ObjC ObjC++ Var(flag_objc_direct_dispatch)
Allow fast jumps to the message dispatcher

; Nonzero means that we will allow new ObjC exception syntax (@throw,
; @try, etc.) in source code.
fobjc-exceptions
ObjC ObjC++ Var(flag_objc_exceptions)
Enable Objective-C exception and synchronization syntax

fobjc-gc
ObjC ObjC++ LTO Var(flag_objc_gc)
Enable garbage collection (GC) in Objective-C/Objective-C++ programs

fobjc-nilcheck
ObjC ObjC++ Var(flag_objc_nilcheck,1)
Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.

; Nonzero means that we generate NeXT setjmp based exceptions.
fobjc-sjlj-exceptions
ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
Enable Objective-C setjmp exception handling runtime

fobjc-std=objc1
ObjC ObjC++ Var(flag_objc1_only)
Conform to the Objective-C 1.0 language as implemented in GCC 4.0

fopenacc
C ObjC C++ ObjC++ LTO Var(flag_openacc)
Enable OpenACC

fopenmp
C ObjC C++ ObjC++ LTO Var(flag_openmp)
Enable OpenMP (implies -frecursive in Fortran)

fopenmp-simd
C ObjC C++ ObjC++ Var(flag_openmp_simd)
Enable OpenMP's SIMD directives

foperator-names
C++ ObjC++
Recognize C++ keywords like \"compl\" and \"xor\"

foptional-diags
C++ ObjC++ Ignore
Does nothing.  Preserved for backward compatibility.

fpch-deps
C ObjC C++ ObjC++

fpch-preprocess
C ObjC C++ ObjC++
Look for and use PCH files even when preprocessing

fpermissive
C++ ObjC++ Var(flag_permissive)
Downgrade conformance errors to warnings

fplan9-extensions
C ObjC Var(flag_plan9_extensions)
Enable Plan 9 language extensions

fpreprocessed
C ObjC C++ ObjC++
Treat the input file as already preprocessed

ftrack-macro-expansion
C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
; converted into ftrack-macro-expansion=

ftrack-macro-expansion=
C ObjC C++ ObjC++ JoinedOrMissing RejectNegative UInteger
-ftrack-macro-expansion=<0|1|2>  Track locations of tokens coming from macro expansion and display them in error messages

fpretty-templates
C++ ObjC++ Var(flag_pretty_templates) Init(1)
-fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments

freplace-objc-classes
ObjC ObjC++ LTO Var(flag_replace_objc_classes)
Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime

frepo
C++ ObjC++
Enable automatic template instantiation

frtti
C++ ObjC++ Optimization Var(flag_rtti) Init(1)
Generate run time type descriptor information

fshort-double
C ObjC C++ ObjC++ LTO Optimization Var(flag_short_double)
Use the same size for double as for float

fshort-enums
C ObjC C++ ObjC++ LTO Optimization Var(flag_short_enums)
Use the narrowest integer type possible for enumeration types

fshort-wchar
C ObjC C++ ObjC++ LTO Optimization Var(flag_short_wchar)
Force the underlying type for \"wchar_t\" to be \"unsigned short\"

fsigned-bitfields
C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
When \"signed\" or \"unsigned\" is not given make the bitfield signed

fsigned-char
C ObjC C++ ObjC++ LTO Var(flag_signed_char)
Make \"char\" signed by default

fsized-deallocation
C++ ObjC++ Var(flag_sized_deallocation) Init(-1)
Enable C++14 sized deallocation support

fsquangle
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fstats
C++ ObjC++ Var(flag_detailed_statistics)
Display statistics accumulated during compilation

fstrict-enums
C++ ObjC++ Optimization Var(flag_strict_enums)
Assume that values of enumeration type are always within the minimum range of that type

fstrict-prototype
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

ftabstop=
C ObjC C++ ObjC++ Joined RejectNegative UInteger
-ftabstop=<number>	Distance between tab stops for column reporting

ftemplate-backtrace-limit=
C++ ObjC++ Joined RejectNegative UInteger Var(template_backtrace_limit) Init(10)
Set the maximum number of template instantiation notes for a single warning or error

ftemplate-depth-
C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)

ftemplate-depth=
C++ ObjC++ Joined RejectNegative UInteger
-ftemplate-depth=<number>	Specify maximum template instantiation depth

fthis-is-variable
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)

fthreadsafe-statics
C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
-fno-threadsafe-statics	Do not generate thread-safe code for initializing local statics

funsigned-bitfields
C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
When \"signed\" or \"unsigned\" is not given make the bitfield unsigned

funsigned-char
C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
Make \"char\" unsigned by default

fuse-cxa-atexit
C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
Use __cxa_atexit to register destructors

fuse-cxa-get-exception-ptr
C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
Use __cxa_get_exception_ptr in exception handling

fvisibility-inlines-hidden
C++ ObjC++
Marks all inlined functions and methods as having hidden visibility

fvisibility-ms-compat
C++ ObjC++ Var(flag_visibility_ms_compat)
Changes visibility to match Microsoft Visual Studio by default

fvtable-gc
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
No longer supported

fvtable-thunks
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
No longer supported

fweak
C++ ObjC++ Var(flag_weak) Init(1)
Emit common-like symbols as weak symbols

fwide-exec-charset=
C ObjC C++ ObjC++ Joined RejectNegative
-fwide-exec-charset=<cset>	Convert all wide strings and character constants to character set <cset>

fworking-directory
C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
Generate a #line directive pointing at the current working directory

fxref
C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
No longer supported

fzero-link
ObjC ObjC++ Var(flag_zero_link)
Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode

gen-decls
ObjC ObjC++ Var(flag_gen_declaration)
Dump declarations to a .decl file

femit-struct-debug-baseonly
C ObjC C++ ObjC++
-femit-struct-debug-baseonly	Aggressive reduced debug info for structs

femit-struct-debug-reduced
C ObjC C++ ObjC++
-femit-struct-debug-reduced	Conservative reduced debug info for structs

femit-struct-debug-detailed=
C ObjC C++ ObjC++ Joined
-femit-struct-debug-detailed=<spec-list>	Detailed reduced debug info for structs

fext-numeric-literals
C++ ObjC++ 
Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding
number literal rather than a user-defined number literal.

idirafter
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
-idirafter <dir>	Add <dir> to the end of the system include path

imacros
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
-imacros <file>	Accept definition of macros in <file>

imultilib
C ObjC C++ ObjC++ Joined Separate
-imultilib <dir>	Set <dir> to be the multilib include subdirectory

include
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
-include <file>	Include the contents of <file> before other files

iprefix
C ObjC C++ ObjC++ Joined Separate
-iprefix <path>	Specify <path> as a prefix for next two options

isysroot
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
-isysroot <dir>	Set <dir> to be the system root directory

isystem
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
-isystem <dir>	Add <dir> to the start of the system include path

iquote
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
-iquote <dir>	Add <dir> to the end of the quote include path

iwithprefix
C ObjC C++ ObjC++ Joined Separate
-iwithprefix <dir>	Add <dir> to the end of the system include path

iwithprefixbefore
C ObjC C++ ObjC++ Joined Separate
-iwithprefixbefore <dir>	Add <dir> to the end of the main include path

lang-asm
C Undocumented RejectDriver

no-integrated-cpp
Driver

nostdinc
C ObjC C++ ObjC++
Do not search standard system include directories (those specified with -isystem will still be used)

nostdinc++
C++ ObjC++
Do not search standard system include directories for C++

o
C ObjC C++ ObjC++ Joined Separate
; Documented in common.opt

pedantic
C ObjC C++ ObjC++ Alias(Wpedantic)
; Documented in common.opt

print-objc-runtime-info
ObjC ObjC++
Generate C header of platform-specific features

remap
C ObjC C++ ObjC++
Remap file names when including files

std=c++98
C++ ObjC++
Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum

std=c++03
C++ ObjC++ Alias(std=c++98)
Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum

std=c++11
C++ ObjC++
Conform to the ISO 2011 C++ standard

std=c++0x
C++ ObjC++ Alias(std=c++11) Undocumented
Deprecated in favor of -std=c++11

std=c++1y
C++ ObjC++ Alias(std=c++14) Undocumented
Deprecated in favor of -std=c++14

std=c++14
C++ ObjC++ Undocumented
Conform to the ISO 2014 C++ standard (experimental and incomplete support)

std=c++1z
C++ ObjC++
Conform to the ISO 2017(?) C++ draft standard (experimental and incomplete support)

std=c++17
C++ ObjC++ Alias(std=c++1z) Undocumented

std=c11
C ObjC
Conform to the ISO 2011 C standard (experimental and incomplete support)

std=c1x
C ObjC Alias(std=c11)
Deprecated in favor of -std=c11

std=c89
C ObjC Alias(std=c90)
Conform to the ISO 1990 C standard

std=c90
C ObjC
Conform to the ISO 1990 C standard

std=c99
C ObjC
Conform to the ISO 1999 C standard

std=c9x
C ObjC Alias(std=c99)
Deprecated in favor of -std=c99

std=gnu++98
C++ ObjC++
Conform to the ISO 1998 C++ standard revised by the 2003 technical
corrigendum with GNU extensions

std=gnu++03
C++ ObjC++ Alias(std=gnu++98)
Conform to the ISO 1998 C++ standard revised by the 2003 technical
corrigendum with GNU extensions

std=gnu++11
C++ ObjC++
Conform to the ISO 2011 C++ standard with GNU extensions (experimental and incomplete support)

std=gnu++0x
C++ ObjC++ Alias(std=gnu++11)
Deprecated in favor of -std=gnu++11

std=gnu++1y
C++ ObjC++ Alias(std=gnu++14) Undocumented

std=gnu++14
C++ ObjC++
Conform to the ISO 2014 C++ standard with GNU extensions (experimental and incomplete support)

std=gnu++1z
C++ ObjC++
Conform to the ISO 201z(7?) C++ draft standard with GNU extensions (experimental and incomplete support)

std=gnu++17
C++ ObjC++ Alias(std=gnu++1z) Undocumented

std=gnu11
C ObjC
Conform to the ISO 2011 C standard with GNU extensions (experimental and incomplete support)

std=gnu1x
C ObjC Alias(std=gnu11)
Deprecated in favor of -std=gnu11

std=gnu89
C ObjC Alias(std=gnu90)
Conform to the ISO 1990 C standard with GNU extensions

std=gnu90
C ObjC
Conform to the ISO 1990 C standard with GNU extensions

std=gnu99
C ObjC
Conform to the ISO 1999 C standard with GNU extensions

std=gnu9x
C ObjC Alias(std=gnu99)
Deprecated in favor of -std=gnu99

std=iso9899:1990
C ObjC Alias(std=c90)
Conform to the ISO 1990 C standard

std=iso9899:199409
C ObjC
Conform to the ISO 1990 C standard as amended in 1994

std=iso9899:1999
C ObjC Alias(std=c99)
Conform to the ISO 1999 C standard

std=iso9899:199x
C ObjC Alias(std=c99)
Deprecated in favor of -std=iso9899:1999

std=iso9899:2011
C ObjC Alias(std=c11)
Conform to the ISO 2011 C standard (experimental and incomplete support)

traditional
Driver

traditional-cpp
C ObjC C++ ObjC++
Enable traditional preprocessing

trigraphs
C ObjC C++ ObjC++
-trigraphs	Support ISO C trigraphs

undef
C ObjC C++ ObjC++ Var(flag_undef)
Do not predefine system-specific and GCC-specific macros

v
C ObjC C++ ObjC++
; Documented in common.opt

w
C ObjC C++ ObjC++
; Documented in common.opt

; This comment is to ensure we retain the blank line above.