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 ObjC ObjC++ Var(warn_assign_intercept) Warning
128 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
131 C ObjC Var(warn_bad_function_cast) Warning
132 Warn about casting functions to incompatible types
134 Wbuiltin-macro-redefined
135 C ObjC C++ ObjC++ Warning
136 Warn when a built-in preprocessor macro is undefined or redefined
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 C++ ObjC 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
203 C++ ObjC++ Var(warn_enum_compare) Init(1) Warning
204 Warn about comparison of different enum types
208 ; Documented in common.opt
210 Werror-implicit-function-declaration
211 C ObjC RejectNegative Warning
212 This switch is deprecated; use -Werror=implicit-function-declaration instead
215 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
216 Warn if testing floating point numbers for equality
219 C ObjC C++ ObjC++ Warning
220 Warn about printf/scanf/strftime/strfmon format string anomalies
223 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning
224 Warn if passing too many arguments to a function for its format string
227 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning
228 Warn about format strings that are not literals
231 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning
232 Warn about format strings that contain NUL bytes
235 C ObjC C++ ObjC++ Var(warn_format_security) Warning
236 Warn about possible security problems with format functions
239 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning
240 Warn about strftime formats yielding 2-digit years
243 C ObjC Var(warn_format_zero_length) Warning
244 Warn about zero-length formats
247 C ObjC C++ ObjC++ Joined Warning
250 C C++ Var(warn_ignored_qualifiers) Init(-1) Warning
251 Warn whenever type qualifiers are ignored.
254 C ObjC C++ ObjC++ Var(warn_init_self) Warning
255 Warn about variables which are initialized to themselves
258 C ObjC C++ ObjC++ Warning
260 Wimplicit-function-declaration
261 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning
262 Warn about implicit function declarations
265 C ObjC Var(warn_implicit_int) Warning
266 Warn when a declaration does not specify a type
269 C ObjC C++ ObjC++ Undocumented
272 C ObjC Var(warn_int_to_pointer_cast) Init(1) Warning
273 Warn when there is a cast to a pointer from an integer of a different size
276 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
277 Warn about invalid uses of the \"offsetof\" macro
280 C ObjC C++ ObjC++ Warning
281 Warn about PCH files that are found but not used
284 C ObjC C++ ObjC++ Var(warn_long_long) Init(1) Warning
285 Do not warn about using \"long long\" when -pedantic
288 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning
289 Warn about suspicious declarations of \"main\"
292 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning
293 Warn about possibly missing braces around initializers
295 Wmissing-declarations
296 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
297 Warn about global functions without previous declarations
299 Wmissing-field-initializers
300 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) Warning
301 Warn about missing fields in struct initializers
303 Wmissing-format-attribute
304 C ObjC C++ ObjC++ Var(warn_missing_format_attribute) Warning
305 Warn about functions which might be candidates for format attributes
307 Wmissing-include-dirs
308 C ObjC C++ ObjC++ Warning
309 Warn about user-specified include directories that do not exist
311 Wmissing-parameter-type
312 C ObjC Var(warn_missing_parameter_type) Init(-1) Warning
313 Warn about function parameters declared without a type specifier in K&R-style functions
316 C ObjC Var(warn_missing_prototypes) Warning
317 Warn about global functions without prototypes
320 C ObjC C++ ObjC++ Warning
321 Warn about use of multi-character character constants
324 C ObjC Var(warn_nested_externs) Warning
325 Warn about \"extern\" declarations not at file scope
328 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
329 Warn when non-templatized friend functions are declared within a template
332 C++ ObjC++ Var(warn_nonvdtor) Warning
333 Warn about non-virtual destructors
336 C ObjC Var(warn_nonnull) Warning
337 Warn about NULL being passed to argument slots marked as requiring non-NULL
340 C ObjC C++ ObjC++ Joined Warning
341 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
344 C++ ObjC++ Var(warn_old_style_cast) Warning
345 Warn if a C-style cast is used in a program
347 Wold-style-declaration
348 C ObjC Var(warn_old_style_declaration) Init(-1) Warning
349 Warn for obsolescent usage in a declaration
351 Wold-style-definition
352 C ObjC Var(warn_old_style_definition) Warning
353 Warn if an old-style parameter definition is used
356 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) Warning
357 Warn if a string is longer than the maximum portable length specified by the standard
360 C++ ObjC++ Var(warn_overloaded_virtual) Warning
361 Warn about overloaded virtual function names
364 C ObjC Var(warn_override_init) Init(-1) Warning
365 Warn about overriding initializers without side effects
368 C ObjC C++ ObjC++ Var(warn_parentheses) Warning
369 Warn about possibly missing parentheses
372 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
373 Warn when converting the type of pointers to member functions
376 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning
377 Warn about function pointer arithmetic
380 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
381 Warn when a pointer is cast to an integer of a different size
384 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
385 Warn about misuses of pragmas
388 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
389 Warn if inherited methods are unimplemented
392 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
393 Warn about multiple declarations of the same object
396 C++ ObjC++ Var(warn_reorder) Warning
397 Warn when the compiler reorders code
400 C ObjC C++ ObjC++ Var(warn_return_type) Warning
401 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
404 ObjC ObjC++ Var(warn_selector) Warning
405 Warn if a selector has multiple methods
408 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning
409 Warn about possible violations of sequence point rules
412 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) Warning
413 Warn about signed-unsigned comparisons
416 C++ ObjC++ Var(warn_sign_promo) Warning
417 Warn when overload promotes from unsigned to signed
419 Wstrict-null-sentinel
421 Warn about uncasted NULL used as sentinel
424 C ObjC Var(warn_strict_prototypes) Warning
425 Warn about unprototyped function declarations
427 Wstrict-selector-match
428 ObjC ObjC++ Var(warn_strict_selector_match) Warning
429 Warn if type signatures of candidate methods do not match exactly
432 C C++ Var(warn_sync_nand) Init(1) Warning
433 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
436 C++ ObjC++ Var(warn_synth) Warning
437 Deprecated. This switch has no effect
440 C ObjC C++ ObjC++ Warning
441 Do not suppress warnings from system headers
444 C ObjC Var(warn_traditional) Warning
445 Warn about features not present in traditional C
447 Wtraditional-conversion
448 C ObjC Var(warn_traditional_conversion) Warning
449 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
452 C ObjC C++ ObjC++ Warning
453 Warn if trigraphs are encountered that might affect the meaning of the program
456 ObjC ObjC++ Var(warn_undeclared_selector) Warning
457 Warn about @selector()s without previously declared methods
460 C ObjC C++ ObjC++ Warning
461 Warn if an undefined macro is used in an #if directive
464 C ObjC C++ ObjC++ Warning
465 Warn about unrecognized pragmas
468 C ObjC C++ ObjC++ Warning
469 Warn about macros defined in the main file that are not used
472 C ObjC C++ ObjC++ Warning
473 Do not warn about using variadic macros when -pedantic
476 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
477 Warn if a variable length array is used
479 Wvolatile-register-var
480 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning
481 Warn when a register variable is declared volatile
484 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
485 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.
488 C ObjC Var(warn_pointer_sign) Init(-1) Warning
489 Warn when a pointer differs in signedness in an assignment
493 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
496 C ObjC C++ ObjC++ Joined
497 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
501 Enforce class member access control semantics
506 falt-external-templates
508 Change when template instances are emitted
512 Recognize the \"asm\" keyword
516 Recognize built-in functions
519 C ObjC C++ ObjC++ Joined
523 Check the return value of new
527 Allow the arguments of the '?' operator to have different types
531 Reduce the size of object files
533 fconstant-string-class=
535 -fconst-string-class=<name> Use class <name> for constant strings
539 Inline member functions by default
543 Preprocess directives only.
545 fdollars-in-identifiers
547 Permit '$' as an identifier character
554 Generate code to check exception specifications
560 C ObjC C++ ObjC++ Joined RejectNegative
561 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
563 fextended-identifiers
565 Permit universal character names (\\u and \\U) in identifiers
568 C ObjC C++ ObjC++ Joined RejectNegative
569 -finput-charset=<cset> Specify the default character set for source files
577 Scope of for-init-statement variables is local to the loop
581 Do not assume that standard C libraries and \"main\" exist
585 Recognize GNU-defined keywords
589 Generate code for GNU runtime environment
592 C ObjC Var(flag_gnu89_inline) Init(-1)
593 Use traditional GNU semantics for inline functions
599 C++ ObjC++ Optimization
606 Assume normal C execution environment
610 Enable support for huge objects
614 Export functions even if they can be inlined
616 fimplicit-inline-templates
618 Emit implicit instantiations of inline templates
622 Emit implicit instantiations of templates
625 C++ ObjC++ Var(flag_friend_injection)
626 Inject friend functions into enclosing namespace
631 flax-vector-conversions
633 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
637 Don't warn about uses of Microsoft extensions
639 fname-mangling-version-
647 Generate code for NeXT (Apple Mac OS X) runtime environment
651 Assume that receivers of Objective-C messages may be nil
659 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
660 ; to initialize any non-POD ivars in Objective-C++ classes.
661 fobjc-call-cxx-cdtors
662 ObjC++ Var(flag_objc_call_cxx_cdtors)
663 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
665 fobjc-direct-dispatch
666 ObjC ObjC++ Var(flag_objc_direct_dispatch)
667 Allow fast jumps to the message dispatcher
669 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
670 ; @try, etc.) in source code.
672 ObjC ObjC++ Var(flag_objc_exceptions)
673 Enable Objective-C exception and synchronization syntax
676 ObjC ObjC++ Var(flag_objc_gc)
677 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
679 ; Nonzero means that we generate NeXT setjmp based exceptions.
680 fobjc-sjlj-exceptions
681 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
682 Enable Objective-C setjmp exception handling runtime
685 C ObjC C++ ObjC++ Var(flag_openmp)
690 Recognize C++ keywords like \"compl\" and \"xor\"
694 Enable optional diagnostics
701 Look for and use PCH files even when preprocessing
705 Downgrade conformance errors to warnings
709 Treat the input file as already preprocessed
711 freplace-objc-classes
713 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
717 Enable automatic template instantiation
720 C++ ObjC++ Optimization
721 Generate run time type descriptor information
724 C ObjC C++ ObjC++ Optimization
725 Use the same size for double as for float
728 C ObjC C++ ObjC++ Optimization
729 Use the narrowest integer type possible for enumeration types
732 C ObjC C++ ObjC++ Optimization
733 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
737 When \"signed\" or \"unsigned\" is not given make the bitfield signed
741 Make \"char\" signed by default
748 Display statistics accumulated during compilation
754 C ObjC C++ ObjC++ Joined RejectNegative UInteger
755 -ftabstop=<number> Distance between tab stops for column reporting
758 C++ ObjC++ Joined RejectNegative UInteger
759 -ftemplate-depth-<number> Specify maximum template instantiation depth
765 C++ ObjC++ Optimization
766 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
770 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
774 Make \"char\" unsigned by default
778 Use __cxa_atexit to register destructors
780 fuse-cxa-get-exception-ptr
782 Use __cxa_get_exception_ptr in exception handling
784 fvisibility-inlines-hidden
786 Marks all inlined methods as having hidden visibility
788 fvisibility-ms-compat
789 C++ ObjC++ Var(flag_visibility_ms_compat)
790 Changes visibility to match Microsoft Visual Studio by default
794 Discard unused virtual functions
798 Implement vtables using thunks
802 Emit common-like symbols as weak symbols
805 C ObjC C++ ObjC++ Joined RejectNegative
806 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
810 Generate a #line directive pointing at the current working directory
814 Emit cross referencing information
818 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
822 Dump declarations to a .decl file
824 femit-struct-debug-baseonly
826 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
828 femit-struct-debug-reduced
830 -femit-struct-debug-reduced Conservative reduced debug info for structs
832 femit-struct-debug-detailed=
833 C ObjC C++ ObjC++ Joined
834 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
837 C ObjC C++ ObjC++ Joined Separate
838 -idirafter <dir> Add <dir> to the end of the system include path
841 C ObjC C++ ObjC++ Joined Separate
842 -imacros <file> Accept definition of macros in <file>
845 C ObjC C++ ObjC++ Joined Separate
846 -imultilib <dir> Set <dir> to be the multilib include subdirectory
849 C ObjC C++ ObjC++ Joined Separate
850 -include <file> Include the contents of <file> before other files
853 C ObjC C++ ObjC++ Joined Separate
854 -iprefix <path> Specify <path> as a prefix for next two options
857 C ObjC C++ ObjC++ Joined Separate
858 -isysroot <dir> Set <dir> to be the system root directory
861 C ObjC C++ ObjC++ Joined Separate
862 -isystem <dir> Add <dir> to the start of the system include path
865 C ObjC C++ ObjC++ Joined Separate
866 -iquote <dir> Add <dir> to the end of the quote include path
869 C ObjC C++ ObjC++ Joined Separate
870 -iwithprefix <dir> Add <dir> to the end of the system include path
873 C ObjC C++ ObjC++ Joined Separate
874 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
880 C ObjC C++ ObjC++ Undocumented
884 Do not search standard system include directories (those specified with -isystem will still be used)
888 Do not search standard system include directories for C++
891 C ObjC C++ ObjC++ Joined Separate
892 ; Documented in common.opt
896 ; Documented in common.opt
900 ; Documented in common.opt
902 print-objc-runtime-info
904 Generate C header of platform-specific features
908 Print a checksum of the executable for PCH validity checking, and stop
912 Remap file names when including files
916 Conform to the ISO 1998 C++ standard
920 Conform to the ISO 1998 C++ standard, with extensions that are likely to
921 become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
922 extensions enabled by this mode are experimental and may be removed in
923 future releases of GCC.
927 Conform to the ISO 1990 C standard
931 Conform to the ISO 1999 C standard
935 Deprecated in favor of -std=c99
939 Conform to the ISO 1998 C++ standard with GNU extensions
943 Conform to the ISO 1998 C++ standard, with GNU extensions and
944 extensions that are likely to become a part of the upcoming ISO C++
945 standard, dubbed C++0x. Note that the extensions enabled by this mode
946 are experimental and may be removed in future releases of GCC.
950 Conform to the ISO 1990 C standard with GNU extensions
954 Conform to the ISO 1999 C standard with GNU extensions
958 Deprecated in favor of -std=gnu99
962 Conform to the ISO 1990 C standard
966 Conform to the ISO 1990 C standard as amended in 1994
970 Conform to the ISO 1999 C standard
974 Deprecated in favor of -std=iso9899:1999
978 Enable traditional preprocessing
982 -trigraphs Support ISO C trigraphs
986 Do not predefine system-specific and GCC-specific macros
989 Common C ObjC C++ ObjC++
990 Enable verbose output
994 ; Documented in common.opt
996 ; This comment is to ensure we retain the blank line above.