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.
24 ; Please try to keep this file in ASCII collating order.
39 C ObjC C++ ObjC++ Joined Separate
42 C ObjC C++ ObjC++ Joined Separate
43 -A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
47 Do not discard comments
51 Do not discard comments in macro expansions
54 C ObjC C++ ObjC++ Joined Separate
55 -D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
58 C ObjC C++ ObjC++ Undocumented
61 C ObjC C++ ObjC++ Joined Separate
62 -F <dir> Add <dir> to the end of the main framework include path
66 Print the name of header files as they are used
69 C ObjC C++ ObjC++ Joined Separate
70 -I <dir> Add <dir> to the end of the main include path
74 Generate make dependencies
77 C ObjC C++ ObjC++ Separate
78 Generate make dependencies and compile
81 C ObjC C++ ObjC++ Joined Separate
82 -MF <file> Write dependency output to the given file
86 Treat missing header files as generated files
90 Like -M but ignore system header files
93 C ObjC C++ ObjC++ Separate
94 Like -MD but ignore system header files
98 Generate phony targets for all headers
101 C ObjC C++ ObjC++ Joined Separate
102 -MQ <target> Add a MAKE-quoted target
105 C ObjC C++ ObjC++ Joined Separate
106 -MT <target> Add an unquoted target
110 Do not generate #line directives
113 C ObjC C++ ObjC++ Joined Separate
114 -U<macro> Undefine <macro>
117 C++ ObjC++ Var(warn_abi)
118 Warn about things that will change when compiling with an ABI-compliant compiler
121 C ObjC C++ ObjC++ Var(warn_address)
122 Warn about suspicious uses of memory addresses
126 Enable most warning messages
129 ObjC ObjC++ Var(warn_assign_intercept)
130 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
133 C ObjC Var(warn_bad_function_cast)
134 Warn about casting functions to incompatible types
137 C ObjC Var(warn_cxx_compat)
138 Warn about C constructs that are not in the common subset of C and C++
142 C ObjC C++ ObjC++ Var(warn_cast_qual)
143 Warn about casts which discard qualifiers
146 C ObjC C++ ObjC++ Var(warn_char_subscripts)
147 Warn about subscripts whose type is \"char\"
151 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
155 Synonym for -Wcomment
158 C ObjC C++ ObjC++ Var(warn_conversion)
159 Warn about possibly confusing type conversions
162 C++ ObjC++ Var(warn_ctor_dtor_privacy)
163 Warn when all constructors and destructors are private
165 Wdeclaration-after-statement
166 C ObjC Var(warn_declaration_after_statement)
167 Warn when a declaration is found after a statement
170 C++ ObjC++ Var(warn_deprecated) Init(1)
171 Warn about deprecated compiler features
174 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1)
175 Warn about compile-time integer division by zero
178 C++ ObjC++ Var(warn_ecpp)
179 Warn about violations of Effective C++ style rules
183 Warn about stray tokens after #elif and #endif
187 ; Documented in common.opt
189 Werror-implicit-function-declaration
190 C ObjC RejectNegative
191 Make implicit function declarations an error
194 C ObjC C++ ObjC++ Var(warn_float_equal)
195 Warn if testing floating point numbers for equality
199 Warn about printf/scanf/strftime/strfmon format string anomalies
202 C ObjC C++ ObjC++ Var(warn_format_extra_args)
203 Warn if passing too many arguments to a function for its format string
206 C ObjC C++ ObjC++ Var(warn_format_nonliteral)
207 Warn about format strings that are not literals
210 C ObjC C++ ObjC++ Var(warn_format_security)
211 Warn about possible security problems with format functions
214 C ObjC C++ ObjC++ Var(warn_format_y2k)
215 Warn about strftime formats yielding 2-digit years
218 C ObjC Var(warn_format_zero_length)
219 Warn about zero-length formats
222 C ObjC C++ ObjC++ Joined
225 C ObjC C++ ObjC++ Var(warn_init_self)
226 Warn about variables which are initialized to themselves
231 Wimplicit-function-declaration
232 C ObjC Var(mesg_implicit_function_declaration) Init(-1)
233 Warn about implicit function declarations
236 C ObjC Var(warn_implicit_int)
237 Warn when a declaration does not specify a type
241 Deprecated. This switch has no effect
244 C ObjC Var(warn_int_to_pointer_cast) Init(1)
245 Warn when there is a cast to a pointer from an integer of a different size
248 C++ ObjC++ Var(warn_invalid_offsetof) Init(1)
249 Warn about invalid uses of the \"offsetof\" macro
253 Warn about PCH files that are found but not used
256 C ObjC C++ ObjC++ Var(warn_long_long) Init(1)
257 Do not warn about using \"long long\" when -pedantic
261 Warn about suspicious declarations of \"main\"
264 C ObjC C++ ObjC++ Var(warn_missing_braces)
265 Warn about possibly missing braces around initializers
267 Wmissing-declarations
268 C ObjC Var(warn_missing_declarations)
269 Warn about global functions without previous declarations
271 Wmissing-field-initializers
272 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1)
273 Warn about missing fields in struct initializers
275 Wmissing-format-attribute
276 C ObjC C++ ObjC++ Var(warn_missing_format_attribute)
277 Warn about functions which might be candidates for format attributes
279 Wmissing-include-dirs
281 Warn about user-specified include directories that do not exist
284 C ObjC Var(warn_missing_prototypes)
285 Warn about global functions without prototypes
289 Warn about use of multi-character character constants
292 C ObjC Var(warn_nested_externs)
293 Warn about \"extern\" declarations not at file scope
296 C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
297 Warn when non-templatized friend functions are declared within a template
300 C++ ObjC++ Var(warn_nonvdtor)
301 Warn about non-virtual destructors
304 C ObjC Var(warn_nonnull)
305 Warn about NULL being passed to argument slots marked as requiring non-NULL
308 C ObjC C++ ObjC++ Joined
309 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
312 C++ ObjC++ Var(warn_old_style_cast)
313 Warn if a C-style cast is used in a program
315 Wold-style-definition
316 C ObjC Var(warn_old_style_definition)
317 Warn if an old-style parameter definition is used
320 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1)
321 Warn if a string is longer than the maximum portable length specified by the standard
324 C++ ObjC++ Var(warn_overloaded_virtual)
325 Warn about overloaded virtual function names
328 C ObjC Var(warn_override_init) Init(-1)
329 Warn about overriding initializers without side effects
332 C ObjC C++ ObjC++ Var(warn_parentheses)
333 Warn about possibly missing parentheses
336 C++ ObjC++ Var(warn_pmf2ptr) Init(1)
337 Warn when converting the type of pointers to member functions
340 C ObjC C++ ObjC++ Var(warn_pointer_arith)
341 Warn about function pointer arithmetic
344 C ObjC Var(warn_pointer_to_int_cast) Init(1)
345 Warn when a pointer is cast to an integer of a different size
348 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1)
349 Warn about misuses of pragmas
352 ObjC ObjC++ Var(warn_protocol) Init(1)
353 Warn if inherited methods are unimplemented
356 C ObjC C++ ObjC++ Var(warn_redundant_decls)
357 Warn about multiple declarations of the same object
360 C++ ObjC++ Var(warn_reorder)
361 Warn when the compiler reorders code
364 C ObjC C++ ObjC++ Var(warn_return_type)
365 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
368 ObjC ObjC++ Var(warn_selector)
369 Warn if a selector has multiple methods
372 C ObjC C++ ObjC++ Var(warn_sequence_point)
373 Warn about possible violations of sequence point rules
376 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
377 Warn about signed-unsigned comparisons
380 C++ ObjC++ Var(warn_sign_promo)
381 Warn when overload promotes from unsigned to signed
383 Wstrict-null-sentinel
385 Warn about uncasted NULL used as sentinel
388 C ObjC Var(warn_strict_prototypes)
389 Warn about unprototyped function declarations
391 Wstrict-selector-match
392 ObjC ObjC++ Var(warn_strict_selector_match)
393 Warn if type signatures of candidate methods do not match exactly
396 C++ ObjC++ Var(warn_synth)
397 Warn when synthesis behavior differs from Cfront
401 Do not suppress warnings from system headers
404 C ObjC Var(warn_traditional)
405 Warn about features not present in traditional C
408 Common Var(warn_trampolines)
409 Warn when trampolines are emitted
413 Warn if trigraphs are encountered that might affect the meaning of the program
416 ObjC ObjC++ Var(warn_undeclared_selector)
417 Warn about @selector()s without previously declared methods
421 Warn if an undefined macro is used in an #if directive
425 Warn about unrecognized pragmas
429 Warn about macros defined in the main file that are not used
433 Do not warn about using variadic macros when -pedantic
436 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
437 Warn if a variable length array is used
440 C ObjC C++ ObjC++ Var(warn_write_strings)
441 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.
444 C ObjC Var(warn_pointer_sign) Init(-1)
445 Warn when a pointer differs in signedness in an assignment
449 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
452 C ObjC C++ ObjC++ Joined
453 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
457 Enforce class member access control semantics
462 falt-external-templates
464 Change when template instances are emitted
468 Recognize the \"asm\" keyword
472 Recognize built-in functions
475 C ObjC C++ ObjC++ Joined
479 Check the return value of new
483 Allow the arguments of the '?' operator to have different types
487 Reduce the size of object files
489 fconstant-string-class=
491 -fconst-string-class=<name> Use class <name> for constant strings
495 Inline member functions by default
499 Preprocess directives only.
501 fdollars-in-identifiers
503 Permit '$' as an identifier character
510 Generate code to check exception specifications
516 C ObjC C++ ObjC++ Joined RejectNegative
517 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
519 fextended-identifiers
521 Permit universal character names (\\u and \\U) in identifiers
524 C ObjC C++ ObjC++ Joined RejectNegative
525 -finput-charset=<cset> Specify the default character set for source files
533 Scope of for-init-statement variables is local to the loop
537 Do not assume that standard C libraries and \"main\" exist
541 Recognize GNU-defined keywords
545 Generate code for GNU runtime environment
548 C ObjC Var(flag_gnu89_inline) Init(-1)
549 Use traditional GNU semantics for inline functions
562 Assume normal C execution environment
566 Enable support for huge objects
570 Export functions even if they can be inlined
572 fimplicit-inline-templates
574 Emit implicit instantiations of inline templates
578 Emit implicit instantiations of templates
581 C++ ObjC++ Var(flag_friend_injection)
582 Inject friend functions into enclosing namespace
587 flax-vector-conversions
589 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
593 Don't warn about uses of Microsoft extensions
595 fname-mangling-version-
603 Generate code for NeXT (Apple Mac OS X) runtime environment
607 Assume that receivers of Objective-C messages may be nil
615 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
616 ; to initialize any non-POD ivars in Objective-C++ classes.
617 fobjc-call-cxx-cdtors
618 ObjC++ Var(flag_objc_call_cxx_cdtors)
619 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
621 fobjc-direct-dispatch
622 ObjC ObjC++ Var(flag_objc_direct_dispatch)
623 Allow fast jumps to the message dispatcher
625 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
626 ; @try, etc.) in source code.
628 ObjC ObjC++ Var(flag_objc_exceptions)
629 Enable Objective-C exception and synchronization syntax
632 ObjC ObjC++ Var(flag_objc_gc)
633 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
635 ; Nonzero means that we generate NeXT setjmp based exceptions.
636 fobjc-sjlj-exceptions
637 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
638 Enable Objective-C setjmp exception handling runtime
641 C ObjC C++ ObjC++ Var(flag_openmp)
646 Recognize C++ kewords like \"compl\" and \"xor\"
650 Enable optional diagnostics
657 Look for and use PCH files even when preprocessing
661 Downgrade conformance errors to warnings
665 Treat the input file as already preprocessed
667 freplace-objc-classes
669 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
673 Enable automatic template instantiation
677 Generate run time type descriptor information
681 Use the same size for double as for float
685 Use the narrowest integer type possible for enumeration types
689 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
693 When \"signed\" or \"unsigned\" is not given make the bitfield signed
697 Make \"char\" signed by default
704 Display statistics accumulated during compilation
710 C ObjC C++ ObjC++ Joined RejectNegative UInteger
711 -ftabstop=<number> Distance between tab stops for column reporting
714 C++ ObjC++ Joined RejectNegative UInteger
715 -ftemplate-depth-<number> Specify maximum template instantiation depth
722 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
726 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
730 Make \"char\" unsigned by default
734 Use __cxa_atexit to register destructors
736 fuse-cxa-get-exception-ptr
738 Use __cxa_get_exception_ptr in exception handling
740 fvisibility-inlines-hidden
742 Marks all inlined methods as having hidden visibility
746 Discard unused virtual functions
750 Implement vtables using thunks
754 Emit common-like symbols as weak symbols
757 C ObjC C++ ObjC++ Joined RejectNegative
758 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
762 Generate a #line directive pointing at the current working directory
766 Emit cross referencing information
770 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
774 Dump declarations to a .decl file
776 femit-struct-debug-baseonly
778 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
780 femit-struct-debug-reduced
782 -femit-struct-debug-reduced Conservative reduced debug info for structs
784 femit-struct-debug-detailed=
785 C ObjC C++ ObjC++ Joined
786 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
789 C ObjC C++ ObjC++ Joined Separate
790 -idirafter <dir> Add <dir> to the end of the system include path
793 C ObjC C++ ObjC++ Joined Separate
794 -imacros <file> Accept definition of macros in <file>
797 C ObjC C++ ObjC++ Joined Separate
798 -imultilib <dir> Set <dir> to be the multilib include subdirectory
801 C ObjC C++ ObjC++ Joined Separate
802 -include <file> Include the contents of <file> before other files
805 C ObjC C++ ObjC++ Joined Separate
806 -iprefix <path> Specify <path> as a prefix for next two options
809 C ObjC C++ ObjC++ Joined Separate
810 -isysroot <dir> Set <dir> to be the system root directory
813 C ObjC C++ ObjC++ Joined Separate
814 -isystem <dir> Add <dir> to the start of the system include path
817 C ObjC C++ ObjC++ Joined Separate
818 -iquote <dir> Add <dir> to the end of the quote include path
821 C ObjC C++ ObjC++ Joined Separate
822 -iwithprefix <dir> Add <dir> to the end of the system include path
825 C ObjC C++ ObjC++ Joined Separate
826 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
835 C ObjC C++ ObjC++ Undocumented
839 Do not search standard system include directories (those specified with -isystem will still be used)
843 Do not search standard system include directories for C++
846 C ObjC C++ ObjC++ Joined Separate
847 ; Documented in common.opt
851 ; Documented in common.opt
855 ; Documented in common.opt
857 print-objc-runtime-info
859 Generate C header of platform-specific features
863 Print a checksum of the executable for PCH validity checking, and stop
867 Remap file names when including files
871 Conform to the ISO 1998 C++ standard
875 Conform to the ISO 1990 C standard
879 Conform to the ISO 1999 C standard
883 Deprecated in favor of -std=c99
887 Conform to the ISO 1998 C++ standard with GNU extensions
891 Conform to the ISO 1990 C standard with GNU extensions
895 Conform to the ISO 1999 C standard with GNU extensions
899 Deprecated in favor of -std=gnu99
903 Conform to the ISO 1990 C standard
907 Conform to the ISO 1990 C standard as amended in 1994
911 Conform to the ISO 1999 C standard
915 Deprecated in favor of -std=iso9899:1999
919 Enable traditional preprocessing
923 -trigraphs Support ISO C trigraphs
927 Do not predefine system-specific and GCC-specific macros
931 Enable verbose output
935 ; Documented in common.opt
937 ; This comment is to ensure we retain the blank line above.