1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003, 2004, 2005, 2006 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 2, 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 COPYING. If not, write to the Free
18 ; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
21 ; See the GCC internals manual for a description of this file's format.
23 ; Please try to keep this file in ASCII collating order.
38 C ObjC C++ ObjC++ Joined Separate
41 C ObjC C++ ObjC++ Joined Separate
42 -A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
46 Do not discard comments
50 Do not discard comments in macro expansions
53 C ObjC C++ ObjC++ Joined Separate
54 -D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
57 C ObjC C++ ObjC++ Undocumented
60 C ObjC C++ ObjC++ Joined Separate
61 -F <dir> Add <dir> to the end of the main framework include path
65 Print the name of header files as they are used
68 C ObjC C++ ObjC++ Joined Separate
69 -I <dir> Add <dir> to the end of the main include path
73 Generate make dependencies
76 C ObjC C++ ObjC++ Separate
77 Generate make dependencies and compile
80 C ObjC C++ ObjC++ Joined Separate
81 -MF <file> Write dependency output to the given file
85 Treat missing header files as generated files
89 Like -M but ignore system header files
92 C ObjC C++ ObjC++ Separate
93 Like -MD but ignore system header files
97 Generate phony targets for all headers
100 C ObjC C++ ObjC++ Joined Separate
101 -MQ <target> Add a MAKE-quoted target
104 C ObjC C++ ObjC++ Joined Separate
105 -MT <target> Add an unquoted target
109 Do not generate #line directives
112 C ObjC C++ ObjC++ Joined Separate
113 -U<macro> Undefine <macro>
116 C++ ObjC++ Var(warn_abi)
117 Warn about things that will change when compiling with an ABI-compliant compiler
121 Enable most warning messages
124 ObjC ObjC++ Var(warn_assign_intercept)
125 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
128 C ObjC Var(warn_bad_function_cast)
129 Warn about casting functions to incompatible types
132 C Var(warn_cxx_compat)
133 Warn about C constructs that are not in the common subset of C and C++
137 C ObjC C++ ObjC++ Var(warn_cast_qual)
138 Warn about casts which discard qualifiers
141 C ObjC C++ ObjC++ Var(warn_char_subscripts)
142 Warn about subscripts whose type is \"char\"
145 C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1)
146 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
150 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
154 Synonym for -Wcomment
157 C ObjC C++ ObjC++ Var(warn_conversion)
158 Warn for implicit type conversions that may change a value
161 C++ ObjC++ Var(warn_ctor_dtor_privacy)
162 Warn when all constructors and destructors are private
164 Wdeclaration-after-statement
165 C ObjC Var(warn_declaration_after_statement)
166 Warn when a declaration is found after a statement
169 C++ ObjC++ Var(warn_deprecated) Init(1)
170 Warn about deprecated compiler features
173 C ObjC C++ Var(warn_div_by_zero) Init(1)
174 Warn about compile-time integer division by zero
177 C++ ObjC++ Var(warn_ecpp)
178 Warn about violations of Effective C++ style rules
181 C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1)
182 Warn about an empty body in an if or else statement
186 Warn about stray tokens after #elif and #endif
190 ; Documented in common.opt
192 Werror-implicit-function-declaration
193 C ObjC RejectNegative
194 Make implicit function declarations an error
197 C ObjC C++ ObjC++ Var(warn_float_equal)
198 Warn if testing floating point numbers for equality
202 Warn about printf/scanf/strftime/strfmon format string anomalies
205 C ObjC C++ ObjC++ Var(warn_format_extra_args)
206 Warn if passing too many arguments to a function for its format string
209 C ObjC C++ ObjC++ Var(warn_format_nonliteral)
210 Warn about format strings that are not literals
213 C ObjC C++ ObjC++ Var(warn_format_security)
214 Warn about possible security problems with format functions
217 C ObjC C++ ObjC++ Var(warn_format_y2k)
218 Warn about strftime formats yielding 2-digit years
221 C ObjC Var(warn_format_zero_length)
222 Warn about zero-length formats
225 C ObjC C++ ObjC++ Joined
228 C ObjC C++ ObjC++ Var(warn_init_self)
229 Warn about variables which are initialized to themselves
234 Wimplicit-function-declaration
235 C ObjC Var(mesg_implicit_function_declaration) Init(-1)
236 Warn about implicit function declarations
239 C ObjC Var(warn_implicit_int)
240 Warn when a declaration does not specify a type
244 Deprecated. This switch has no effect
247 C ObjC Var(warn_int_to_pointer_cast) Init(1)
248 Warn when there is a cast to a pointer from an integer of a different size
251 C++ ObjC++ Var(warn_invalid_offsetof) Init(1)
252 Warn about invalid uses of the \"offsetof\" macro
256 Warn about PCH files that are found but not used
259 C ObjC C++ ObjC++ Var(warn_long_long) Init(1)
260 Do not warn about using \"long long\" when -pedantic
264 Warn about suspicious declarations of \"main\"
267 C ObjC C++ ObjC++ Var(warn_missing_braces)
268 Warn about possibly missing braces around initializers
270 Wmissing-declarations
271 C ObjC C++ ObjC++ Var(warn_missing_declarations)
272 Warn about global functions without previous declarations
274 Wmissing-field-initializers
275 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1)
276 Warn about missing fields in struct initializers
278 Wmissing-format-attribute
279 C ObjC C++ ObjC++ Var(warn_missing_format_attribute)
280 Warn about functions which might be candidates for format attributes
282 Wmissing-include-dirs
284 Warn about user-specified include directories that do not exist
286 Wmissing-parameter-type
287 C ObjC Var(warn_missing_parameter_type) Init(-1)
288 Warn about function parameters declared without a type specifier in K&R-style functions
291 C ObjC Var(warn_missing_prototypes)
292 Warn about global functions without prototypes
296 Warn about use of multi-character character constants
299 C ObjC Var(warn_nested_externs)
300 Warn about \"extern\" declarations not at file scope
303 C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
304 Warn when non-templatized friend functions are declared within a template
307 C++ ObjC++ Var(warn_nonvdtor)
308 Warn about non-virtual destructors
311 C ObjC Var(warn_nonnull)
312 Warn about NULL being passed to argument slots marked as requiring non-NULL
315 C ObjC C++ ObjC++ Joined
316 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
319 C++ ObjC++ Var(warn_old_style_cast)
320 Warn if a C-style cast is used in a program
322 Wold-style-declaration
323 C ObjC Var(warn_old_style_declaration) Init(-1)
324 Warn for obsolescent usage in a declaration
326 Wold-style-definition
327 C ObjC Var(warn_old_style_definition)
328 Warn if an old-style parameter definition is used
331 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1)
332 Warn if a string is longer than the maximum portable length specified by the standard
335 C++ ObjC++ Var(warn_overloaded_virtual)
336 Warn about overloaded virtual function names
339 C ObjC Var(warn_override_init) Init(-1)
340 Warn about overriding initializers without side effects
343 C ObjC C++ ObjC++ Var(warn_parentheses)
344 Warn about possibly missing parentheses
347 C++ ObjC++ Var(warn_pmf2ptr) Init(1)
348 Warn when converting the type of pointers to member functions
351 C ObjC C++ ObjC++ Var(warn_pointer_arith)
352 Warn about function pointer arithmetic
355 C ObjC Var(warn_pointer_to_int_cast) Init(1)
356 Warn when a pointer is cast to an integer of a different size
359 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1)
360 Warn about misuses of pragmas
363 ObjC ObjC++ Var(warn_protocol) Init(1)
364 Warn if inherited methods are unimplemented
367 C ObjC C++ ObjC++ Var(warn_redundant_decls)
368 Warn about multiple declarations of the same object
371 C++ ObjC++ Var(warn_reorder)
372 Warn when the compiler reorders code
375 C ObjC C++ ObjC++ Var(warn_return_type)
376 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
379 ObjC ObjC++ Var(warn_selector)
380 Warn if a selector has multiple methods
383 C ObjC C++ ObjC++ Var(warn_sequence_point)
384 Warn about possible violations of sequence point rules
387 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
388 Warn about signed-unsigned comparisons
391 C++ ObjC++ Var(warn_sign_promo)
392 Warn when overload promotes from unsigned to signed
394 Wstrict-null-sentinel
396 Warn about uncasted NULL used as sentinel
399 C ObjC Var(warn_strict_prototypes)
400 Warn about unprototyped function declarations
402 Wstrict-selector-match
403 ObjC ObjC++ Var(warn_strict_selector_match)
404 Warn if type signatures of candidate methods do not match exactly
407 C++ ObjC++ Var(warn_synth)
408 Warn when synthesis behavior differs from Cfront
412 Do not suppress warnings from system headers
415 C ObjC Var(warn_traditional)
416 Warn about features not present in traditional C
418 Wtraditional-conversion
419 C ObjC Var(warn_traditional_conversion)
420 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
424 Warn if trigraphs are encountered that might affect the meaning of the program
427 ObjC ObjC++ Var(warn_undeclared_selector)
428 Warn about @selector()s without previously declared methods
432 Warn if an undefined macro is used in an #if directive
436 Warn about unrecognized pragmas
440 Warn about macros defined in the main file that are not used
444 Do not warn about using variadic macros when -pedantic
447 C ObjC C++ ObjC++ Var(warn_write_strings)
448 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.
451 C ObjC Var(warn_pointer_sign) Init(-1)
452 Warn when a pointer differs in signedness in an assignment
456 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
459 C ObjC C++ ObjC++ Joined
460 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
464 Enforce class member access control semantics
469 falt-external-templates
471 Change when template instances are emitted
475 Recognize the \"asm\" keyword
479 Recognize built-in functions
482 C ObjC C++ ObjC++ Joined
486 Check the return value of new
490 Allow the arguments of the '?' operator to have different types
494 Reduce the size of object files
496 fconstant-string-class=
498 -fconst-string-class=<name> Use class <name> for constant strings
502 Inline member functions by default
504 fdollars-in-identifiers
506 Permit '$' as an identifier character
513 Generate code to check exception specifications
519 C ObjC C++ ObjC++ Joined RejectNegative
520 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
522 fextended-identifiers
524 Permit universal character names (\\u and \\U) in identifiers
527 C ObjC C++ ObjC++ Joined RejectNegative
528 -finput-charset=<cset> Specify the default character set for source files
536 Scope of for-init-statement variables is local to the loop
540 Do not assume that standard C libraries and \"main\" exist
544 Recognize GNU-defined keywords
548 Generate code for GNU runtime environment
561 Assume normal C execution environment
565 Enable support for huge objects
569 Export functions even if they can be inlined
571 fimplicit-inline-templates
573 Emit implicit instantiations of inline templates
577 Emit implicit instantiations of templates
580 C++ Var(flag_friend_injection)
581 Inject friend functions into enclosing namespace
586 flax-vector-conversions
588 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
592 Don't warn about uses of Microsoft extensions
594 fname-mangling-version-
602 Generate code for NeXT (Apple Mac OS X) runtime environment
606 Assume that receivers of Objective-C messages may be nil
614 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
615 ; to initialize any non-POD ivars in Objective-C++ classes.
616 fobjc-call-cxx-cdtors
617 ObjC++ Var(flag_objc_call_cxx_cdtors)
618 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
620 fobjc-direct-dispatch
621 ObjC ObjC++ Var(flag_objc_direct_dispatch)
622 Allow fast jumps to the message dispatcher
624 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
625 ; @try, etc.) in source code.
627 ObjC ObjC++ Var(flag_objc_exceptions)
628 Enable Objective-C exception and synchronization syntax
631 ObjC ObjC++ Var(flag_objc_gc)
632 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
634 ; Nonzero means that we generate NeXT setjmp based exceptions.
635 fobjc-sjlj-exceptions
636 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
637 Enable Objective-C setjmp exception handling runtime
640 C ObjC C++ ObjC++ Var(flag_openmp)
645 Recognize C++ kewords like \"compl\" and \"xor\"
649 Enable optional diagnostics
656 Look for and use PCH files even when preprocessing
660 Downgrade conformance errors to warnings
664 Treat the input file as already preprocessed
666 freplace-objc-classes
668 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
672 Enable automatic template instantiation
676 Generate run time type descriptor information
680 Use the same size for double as for float
684 Use the narrowest integer type possible for enumeration types
688 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
692 When \"signed\" or \"unsigned\" is not given make the bitfield signed
696 Make \"char\" signed by default
703 Display statistics accumulated during compilation
709 C ObjC C++ ObjC++ Joined RejectNegative UInteger
710 -ftabstop=<number> Distance between tab stops for column reporting
713 C++ ObjC++ Joined RejectNegative UInteger
714 -ftemplate-depth-<number> Specify maximum template instantiation depth
721 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
725 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
729 Make \"char\" unsigned by default
733 Use __cxa_atexit to register destructors
735 fuse-cxa-get-exception-ptr
737 Use __cxa_get_exception_ptr in exception handling
739 fvisibility-inlines-hidden
741 Marks all inlined methods as having hidden visibility
745 Discard unused virtual functions
749 Implement vtables using thunks
753 Emit common-like symbols as weak symbols
756 C ObjC C++ ObjC++ Joined RejectNegative
757 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
761 Generate a #line directive pointing at the current working directory
765 Emit cross referencing information
769 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
773 Dump declarations to a .decl file
776 C ObjC C++ ObjC++ Joined Separate
777 -idirafter <dir> Add <dir> to the end of the system include path
780 C ObjC C++ ObjC++ Joined Separate
781 -imacros <file> Accept definition of macros in <file>
784 C ObjC C++ ObjC++ Joined Separate
785 -imultilib <dir> Set <dir> to be the multilib include subdirectory
788 C ObjC C++ ObjC++ Joined Separate
789 -include <file> Include the contents of <file> before other files
792 C ObjC C++ ObjC++ Joined Separate
793 -iprefix <path> Specify <path> as a prefix for next two options
796 C ObjC C++ ObjC++ Joined Separate
797 -isysroot <dir> Set <dir> to be the system root directory
800 C ObjC C++ ObjC++ Joined Separate
801 -isystem <dir> Add <dir> to the start of the system include path
804 C ObjC C++ ObjC++ Joined Separate
805 -iquote <dir> Add <dir> to the end of the quote include path
808 C ObjC C++ ObjC++ Joined Separate
809 -iwithprefix <dir> Add <dir> to the end of the system include path
812 C ObjC C++ ObjC++ Joined Separate
813 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
822 C ObjC C++ ObjC++ Undocumented
826 Do not search standard system include directories (those specified with -isystem will still be used)
830 Do not search standard system include directories for C++
833 C ObjC C++ ObjC++ Joined Separate
834 ; Documented in common.opt
838 ; Documented in common.opt
842 ; Documented in common.opt
844 print-objc-runtime-info
846 Generate C header of platform-specific features
850 Print a checksum of the executable for PCH validity checking, and stop
854 Remap file names when including files
858 Conform to the ISO 1998 C++ standard
862 Conform to the ISO 1998 C++ standard, with extensions that are likely to
863 become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
864 extensions enabled by this mode are experimental and may be removed in
865 future releases of GCC.
869 Conform to the ISO 1990 C standard
873 Conform to the ISO 1999 C standard
877 Deprecated in favor of -std=c99
881 Conform to the ISO 1998 C++ standard with GNU extensions
885 Conform to the ISO 1998 C++ standard, with GNU extensions and
886 extensions that are likely to become a part of the upcoming ISO C++
887 standard, dubbed C++0x. Note that the extensions enabled by this mode
888 are experimental and may be removed in future releases of GCC.
892 Conform to the ISO 1990 C standard with GNU extensions
896 Conform to the ISO 1999 C standard with GNU extensions
900 Deprecated in favor of -std=gnu99
904 Conform to the ISO 1990 C standard
908 Conform to the ISO 1990 C standard as amended in 1994
912 Conform to the ISO 1999 C standard
916 Deprecated in favor of -std=iso9899:1999
920 Enable traditional preprocessing
924 -trigraphs Support ISO C trigraphs
928 Do not predefine system-specific and GCC-specific macros
932 Enable verbose output
936 ; Documented in common.opt
938 ; This comment is to ensure we retain the blank line above.