1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003, 2004, 2005, 2006, 2007 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++ Joined Separate
40 C ObjC C++ ObjC++ Joined Separate
41 -A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
45 Do not discard comments
49 Do not discard comments in macro expansions
52 C ObjC C++ ObjC++ Joined Separate
53 -D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
56 C ObjC C++ ObjC++ Undocumented
59 C ObjC C++ ObjC++ Joined Separate
60 -F <dir> Add <dir> to the end of the main framework include path
64 Print the name of header files as they are used
67 C ObjC C++ ObjC++ Joined Separate
68 -I <dir> Add <dir> to the end of the main include path
72 Generate make dependencies
75 C ObjC C++ ObjC++ Separate
76 Generate make dependencies and compile
79 C ObjC C++ ObjC++ Joined Separate
80 -MF <file> Write dependency output to the given file
84 Treat missing header files as generated files
88 Like -M but ignore system header files
91 C ObjC C++ ObjC++ Separate
92 Like -MD but ignore system header files
96 Generate phony targets for all headers
99 C ObjC C++ ObjC++ Joined Separate
100 -MQ <target> Add a MAKE-quoted target
103 C ObjC C++ ObjC++ Joined Separate
104 -MT <target> Add an unquoted target
108 Do not generate #line directives
111 C ObjC C++ ObjC++ Joined Separate
112 -U<macro> Undefine <macro>
115 C++ ObjC++ Var(warn_abi) Warning
116 Warn about things that will change when compiling with an ABI-compliant compiler
119 C ObjC C++ ObjC++ Var(warn_address) Warning
120 Warn about suspicious uses of memory addresses
123 C ObjC C++ ObjC++ Warning
124 Enable most warning messages
127 C ObjC C++ ObjC++ Var(warn_type_limits) Init(-1) Warning
128 Warn if a comparison is always true or always false due to the limited range of the data type
131 ObjC ObjC++ Var(warn_assign_intercept) Warning
132 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
135 C ObjC Var(warn_bad_function_cast) Warning
136 Warn about casting functions to incompatible types
139 C ObjC Var(warn_cxx_compat) Warning
140 Warn about C constructs that are not in the common subset of C and C++
143 C++ ObjC++ Var(warn_cxx0x_compat) Warning
144 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 200x
147 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
148 Warn about casts which discard qualifiers
151 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning
152 Warn about subscripts whose type is \"char\"
155 C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1) Warning
156 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
159 C ObjC C++ ObjC++ Warning
160 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
163 C ObjC C++ ObjC++ Warning
164 Synonym for -Wcomment
167 C ObjC C++ ObjC++ Var(warn_conversion) Warning
168 Warn for implicit type conversions that may change a value
171 C ObjC C++ ObjC++ Var(warn_sign_conversion) Init(-1)
172 Warn for implicit type conversions between signed and unsigned integers
175 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
176 Warn when all constructors and destructors are private
178 Wdeclaration-after-statement
179 C ObjC Var(warn_declaration_after_statement) Warning
180 Warn when a declaration is found after a statement
183 C++ ObjC++ Var(warn_deprecated) Init(1) Warning
184 Warn about deprecated compiler features
187 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
188 Warn about compile-time integer division by zero
191 C++ ObjC++ Var(warn_ecpp) Warning
192 Warn about violations of Effective C++ style rules
195 C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1) Warning
196 Warn about an empty body in an if or else statement
199 C ObjC C++ ObjC++ Warning
200 Warn about stray tokens after #elif and #endif
204 ; Documented in common.opt
206 Werror-implicit-function-declaration
207 C ObjC RejectNegative Warning
208 This switch is deprecated; use -Werror=implicit-function-declaration instead
211 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
212 Warn if testing floating point numbers for equality
215 C ObjC C++ ObjC++ Warning
216 Warn about printf/scanf/strftime/strfmon format string anomalies
219 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning
220 Warn if passing too many arguments to a function for its format string
223 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning
224 Warn about format strings that are not literals
227 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning
228 Warn about format strings that contain NUL bytes
231 C ObjC C++ ObjC++ Var(warn_format_security) Warning
232 Warn about possible security problems with format functions
235 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning
236 Warn about strftime formats yielding 2-digit years
239 C ObjC Var(warn_format_zero_length) Warning
240 Warn about zero-length formats
243 C ObjC C++ ObjC++ Joined Warning
246 C C++ Var(warn_ignored_qualifiers) Init(-1) Warning
247 Warn whenever type qualifiers are ignored.
250 C ObjC C++ ObjC++ Var(warn_init_self) Warning
251 Warn about variables which are initialized to themselves
254 C ObjC C++ ObjC++ Warning
256 Wimplicit-function-declaration
257 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning
258 Warn about implicit function declarations
261 C ObjC Var(warn_implicit_int) Warning
262 Warn when a declaration does not specify a type
266 Deprecated. This switch has no effect
269 C ObjC Var(warn_int_to_pointer_cast) Init(1) Warning
270 Warn when there is a cast to a pointer from an integer of a different size
273 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
274 Warn about invalid uses of the \"offsetof\" macro
277 C ObjC C++ ObjC++ Warning
278 Warn about PCH files that are found but not used
281 C ObjC C++ ObjC++ Var(warn_long_long) Init(1) Warning
282 Do not warn about using \"long long\" when -pedantic
285 C ObjC C++ ObjC++ Warning
286 Warn about suspicious declarations of \"main\"
289 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning
290 Warn about possibly missing braces around initializers
292 Wmissing-declarations
293 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
294 Warn about global functions without previous declarations
296 Wmissing-field-initializers
297 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) Warning
298 Warn about missing fields in struct initializers
300 Wmissing-format-attribute
301 C ObjC C++ ObjC++ Var(warn_missing_format_attribute) Warning
302 Warn about functions which might be candidates for format attributes
304 Wmissing-include-dirs
305 C ObjC C++ ObjC++ Warning
306 Warn about user-specified include directories that do not exist
308 Wmissing-parameter-type
309 C ObjC Var(warn_missing_parameter_type) Init(-1) Warning
310 Warn about function parameters declared without a type specifier in K&R-style functions
313 C ObjC Var(warn_missing_prototypes) Warning
314 Warn about global functions without prototypes
317 C ObjC C++ ObjC++ Warning
318 Warn about use of multi-character character constants
321 C ObjC Var(warn_nested_externs) Warning
322 Warn about \"extern\" declarations not at file scope
325 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
326 Warn when non-templatized friend functions are declared within a template
329 C++ ObjC++ Var(warn_nonvdtor) Warning
330 Warn about non-virtual destructors
333 C ObjC Var(warn_nonnull) Warning
334 Warn about NULL being passed to argument slots marked as requiring non-NULL
337 C ObjC C++ ObjC++ Joined Warning
338 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
341 C++ ObjC++ Var(warn_old_style_cast) Warning
342 Warn if a C-style cast is used in a program
344 Wold-style-declaration
345 C ObjC Var(warn_old_style_declaration) Init(-1) Warning
346 Warn for obsolescent usage in a declaration
348 Wold-style-definition
349 C ObjC Var(warn_old_style_definition) Warning
350 Warn if an old-style parameter definition is used
353 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) Warning
354 Warn if a string is longer than the maximum portable length specified by the standard
357 C++ ObjC++ Var(warn_overloaded_virtual) Warning
358 Warn about overloaded virtual function names
361 C ObjC Var(warn_override_init) Init(-1) Warning
362 Warn about overriding initializers without side effects
365 C ObjC C++ ObjC++ Var(warn_parentheses) Warning
366 Warn about possibly missing parentheses
369 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
370 Warn when converting the type of pointers to member functions
373 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning
374 Warn about function pointer arithmetic
377 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
378 Warn when a pointer is cast to an integer of a different size
381 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
382 Warn about misuses of pragmas
385 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
386 Warn if inherited methods are unimplemented
389 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
390 Warn about multiple declarations of the same object
393 C++ ObjC++ Var(warn_reorder) Warning
394 Warn when the compiler reorders code
397 C ObjC C++ ObjC++ Var(warn_return_type) Warning
398 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
401 ObjC ObjC++ Var(warn_selector) Warning
402 Warn if a selector has multiple methods
405 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning
406 Warn about possible violations of sequence point rules
409 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) Warning
410 Warn about signed-unsigned comparisons
413 C++ ObjC++ Var(warn_sign_promo) Warning
414 Warn when overload promotes from unsigned to signed
416 Wstrict-null-sentinel
418 Warn about uncasted NULL used as sentinel
421 C ObjC Var(warn_strict_prototypes) Warning
422 Warn about unprototyped function declarations
424 Wstrict-selector-match
425 ObjC ObjC++ Var(warn_strict_selector_match) Warning
426 Warn if type signatures of candidate methods do not match exactly
429 C++ ObjC++ Var(warn_synth) Warning
430 Warn when synthesis behavior differs from Cfront
433 C ObjC C++ ObjC++ Warning
434 Do not suppress warnings from system headers
437 C ObjC Var(warn_traditional) Warning
438 Warn about features not present in traditional C
440 Wtraditional-conversion
441 C ObjC Var(warn_traditional_conversion) Warning
442 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
445 C ObjC C++ ObjC++ Warning
446 Warn if trigraphs are encountered that might affect the meaning of the program
449 ObjC ObjC++ Var(warn_undeclared_selector) Warning
450 Warn about @selector()s without previously declared methods
453 C ObjC C++ ObjC++ Warning
454 Warn if an undefined macro is used in an #if directive
457 C ObjC C++ ObjC++ Warning
458 Warn about unrecognized pragmas
461 C ObjC C++ ObjC++ Warning
462 Warn about macros defined in the main file that are not used
465 C ObjC C++ ObjC++ Warning
466 Do not warn about using variadic macros when -pedantic
469 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
470 Warn if a variable length array is used
473 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
474 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.
477 C ObjC Var(warn_pointer_sign) Init(-1) Warning
478 Warn when a pointer differs in signedness in an assignment
482 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
485 C ObjC C++ ObjC++ Joined
486 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
490 Enforce class member access control semantics
495 falt-external-templates
497 Change when template instances are emitted
501 Recognize the \"asm\" keyword
505 Recognize built-in functions
508 C ObjC C++ ObjC++ Joined
512 Check the return value of new
516 Allow the arguments of the '?' operator to have different types
520 Reduce the size of object files
522 fconstant-string-class=
524 -fconst-string-class=<name> Use class <name> for constant strings
528 Inline member functions by default
532 Preprocess directives only.
534 fdollars-in-identifiers
536 Permit '$' as an identifier character
543 Generate code to check exception specifications
549 C ObjC C++ ObjC++ Joined RejectNegative
550 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
552 fextended-identifiers
554 Permit universal character names (\\u and \\U) in identifiers
557 C ObjC C++ ObjC++ Joined RejectNegative
558 -finput-charset=<cset> Specify the default character set for source files
566 Scope of for-init-statement variables is local to the loop
570 Do not assume that standard C libraries and \"main\" exist
574 Recognize GNU-defined keywords
578 Generate code for GNU runtime environment
581 C ObjC Var(flag_gnu89_inline) Init(-1)
582 Use traditional GNU semantics for inline functions
588 C++ ObjC++ Optimization
595 Assume normal C execution environment
599 Enable support for huge objects
603 Export functions even if they can be inlined
605 fimplicit-inline-templates
607 Emit implicit instantiations of inline templates
611 Emit implicit instantiations of templates
614 C++ ObjC++ Var(flag_friend_injection)
615 Inject friend functions into enclosing namespace
620 flax-vector-conversions
622 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
626 Don't warn about uses of Microsoft extensions
628 fname-mangling-version-
636 Generate code for NeXT (Apple Mac OS X) runtime environment
640 Assume that receivers of Objective-C messages may be nil
648 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
649 ; to initialize any non-POD ivars in Objective-C++ classes.
650 fobjc-call-cxx-cdtors
651 ObjC++ Var(flag_objc_call_cxx_cdtors)
652 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
654 fobjc-direct-dispatch
655 ObjC ObjC++ Var(flag_objc_direct_dispatch)
656 Allow fast jumps to the message dispatcher
658 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
659 ; @try, etc.) in source code.
661 ObjC ObjC++ Var(flag_objc_exceptions)
662 Enable Objective-C exception and synchronization syntax
665 ObjC ObjC++ Var(flag_objc_gc)
666 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
668 ; Nonzero means that we generate NeXT setjmp based exceptions.
669 fobjc-sjlj-exceptions
670 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
671 Enable Objective-C setjmp exception handling runtime
674 C ObjC C++ ObjC++ Var(flag_openmp)
679 Recognize C++ kewords like \"compl\" and \"xor\"
683 Enable optional diagnostics
690 Look for and use PCH files even when preprocessing
694 Downgrade conformance errors to warnings
698 Treat the input file as already preprocessed
700 freplace-objc-classes
702 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
706 Enable automatic template instantiation
709 C++ ObjC++ Optimization
710 Generate run time type descriptor information
713 C ObjC C++ ObjC++ Optimization
714 Use the same size for double as for float
717 C ObjC C++ ObjC++ Optimization
718 Use the narrowest integer type possible for enumeration types
721 C ObjC C++ ObjC++ Optimization
722 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
726 When \"signed\" or \"unsigned\" is not given make the bitfield signed
730 Make \"char\" signed by default
737 Display statistics accumulated during compilation
743 C ObjC C++ ObjC++ Joined RejectNegative UInteger
744 -ftabstop=<number> Distance between tab stops for column reporting
747 C++ ObjC++ Joined RejectNegative UInteger
748 -ftemplate-depth-<number> Specify maximum template instantiation depth
754 C++ ObjC++ Optimization
755 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
759 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
763 Make \"char\" unsigned by default
767 Use __cxa_atexit to register destructors
769 fuse-cxa-get-exception-ptr
771 Use __cxa_get_exception_ptr in exception handling
773 fvisibility-inlines-hidden
775 Marks all inlined methods as having hidden visibility
777 fvisibility-ms-compat
778 C++ ObjC++ Var(flag_visibility_ms_compat)
779 Changes visibility to match Microsoft Visual Studio by default
783 Discard unused virtual functions
787 Implement vtables using thunks
791 Emit common-like symbols as weak symbols
794 C ObjC C++ ObjC++ Joined RejectNegative
795 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
799 Generate a #line directive pointing at the current working directory
803 Emit cross referencing information
807 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
811 Dump declarations to a .decl file
813 femit-struct-debug-baseonly
815 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
817 femit-struct-debug-reduced
819 -femit-struct-debug-reduced Conservative reduced debug info for structs
821 femit-struct-debug-detailed=
822 C ObjC C++ ObjC++ Joined
823 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
826 C ObjC C++ ObjC++ Joined Separate
827 -idirafter <dir> Add <dir> to the end of the system include path
830 C ObjC C++ ObjC++ Joined Separate
831 -imacros <file> Accept definition of macros in <file>
834 C ObjC C++ ObjC++ Joined Separate
835 -imultilib <dir> Set <dir> to be the multilib include subdirectory
838 C ObjC C++ ObjC++ Joined Separate
839 -include <file> Include the contents of <file> before other files
842 C ObjC C++ ObjC++ Joined Separate
843 -iprefix <path> Specify <path> as a prefix for next two options
846 C ObjC C++ ObjC++ Joined Separate
847 -isysroot <dir> Set <dir> to be the system root directory
850 C ObjC C++ ObjC++ Joined Separate
851 -isystem <dir> Add <dir> to the start of the system include path
854 C ObjC C++ ObjC++ Joined Separate
855 -iquote <dir> Add <dir> to the end of the quote include path
858 C ObjC C++ ObjC++ Joined Separate
859 -iwithprefix <dir> Add <dir> to the end of the system include path
862 C ObjC C++ ObjC++ Joined Separate
863 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
872 C ObjC C++ ObjC++ Undocumented
876 Do not search standard system include directories (those specified with -isystem will still be used)
880 Do not search standard system include directories for C++
883 C ObjC C++ ObjC++ Joined Separate
884 ; Documented in common.opt
888 ; Documented in common.opt
892 ; Documented in common.opt
894 print-objc-runtime-info
896 Generate C header of platform-specific features
900 Print a checksum of the executable for PCH validity checking, and stop
904 Remap file names when including files
908 Conform to the ISO 1998 C++ standard
912 Conform to the ISO 1998 C++ standard, with extensions that are likely to
913 become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
914 extensions enabled by this mode are experimental and may be removed in
915 future releases of GCC.
919 Conform to the ISO 1990 C standard
923 Conform to the ISO 1999 C standard
927 Deprecated in favor of -std=c99
931 Conform to the ISO 1998 C++ standard with GNU extensions
935 Conform to the ISO 1998 C++ standard, with GNU extensions and
936 extensions that are likely to become a part of the upcoming ISO C++
937 standard, dubbed C++0x. Note that the extensions enabled by this mode
938 are experimental and may be removed in future releases of GCC.
942 Conform to the ISO 1990 C standard with GNU extensions
946 Conform to the ISO 1999 C standard with GNU extensions
950 Deprecated in favor of -std=gnu99
954 Conform to the ISO 1990 C standard
958 Conform to the ISO 1990 C standard as amended in 1994
962 Conform to the ISO 1999 C standard
966 Deprecated in favor of -std=iso9899:1999
970 Enable traditional preprocessing
974 -trigraphs Support ISO C trigraphs
978 Do not predefine system-specific and GCC-specific macros
982 Enable verbose output
986 ; Documented in common.opt
988 ; This comment is to ensure we retain the blank line above.