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\"
146 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
150 Synonym for -Wcomment
153 C ObjC C++ ObjC++ Var(warn_conversion)
154 Warn about possibly confusing type conversions
157 C++ ObjC++ Var(warn_ctor_dtor_privacy)
158 Warn when all constructors and destructors are private
160 Wdeclaration-after-statement
161 C ObjC Var(warn_declaration_after_statement)
162 Warn when a declaration is found after a statement
165 C++ ObjC++ Var(warn_deprecated) Init(1)
166 Warn about deprecated compiler features
169 C ObjC Var(warn_div_by_zero) Init(1)
170 Warn about compile-time integer division by zero
173 C++ ObjC++ Var(warn_ecpp)
174 Warn about violations of Effective C++ style rules
178 Warn about stray tokens after #elif and #endif
182 ; Documented in common.opt
184 Werror-implicit-function-declaration
185 C ObjC RejectNegative
186 Make implicit function declarations an error
189 C ObjC C++ ObjC++ Var(warn_float_equal)
190 Warn if testing floating point numbers for equality
194 Warn about printf/scanf/strftime/strfmon format string anomalies
197 C ObjC C++ ObjC++ Var(warn_format_extra_args)
198 Warn if passing too many arguments to a function for its format string
201 C ObjC C++ ObjC++ Var(warn_format_nonliteral)
202 Warn about format strings that are not literals
205 C ObjC C++ ObjC++ Var(warn_format_security)
206 Warn about possible security problems with format functions
209 C ObjC C++ ObjC++ Var(warn_format_y2k)
210 Warn about strftime formats yielding 2-digit years
213 C ObjC Var(warn_format_zero_length)
214 Warn about zero-length formats
217 C ObjC C++ ObjC++ Joined
220 C ObjC C++ ObjC++ Var(warn_init_self)
221 Warn about variables which are initialized to themselves
226 Wimplicit-function-declaration
227 C ObjC Var(mesg_implicit_function_declaration) Init(-1)
228 Warn about implicit function declarations
231 C ObjC Var(warn_implicit_int)
232 Warn when a declaration does not specify a type
236 Deprecated. This switch has no effect
239 C ObjC Var(warn_int_to_pointer_cast) Init(1)
240 Warn when there is a cast to a pointer from an integer of a different size
243 C++ ObjC++ Var(warn_invalid_offsetof) Init(1)
244 Warn about invalid uses of the \"offsetof\" macro
248 Warn about PCH files that are found but not used
251 C ObjC C++ ObjC++ Var(warn_long_long) Init(1)
252 Do not warn about using \"long long\" when -pedantic
256 Warn about suspicious declarations of \"main\"
259 C ObjC C++ ObjC++ Var(warn_missing_braces)
260 Warn about possibly missing braces around initializers
262 Wmissing-declarations
263 C ObjC Var(warn_missing_declarations)
264 Warn about global functions without previous declarations
266 Wmissing-field-initializers
267 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1)
268 Warn about missing fields in struct initializers
270 Wmissing-format-attribute
271 C ObjC C++ ObjC++ Var(warn_missing_format_attribute)
272 Warn about functions which might be candidates for format attributes
274 Wmissing-include-dirs
276 Warn about user-specified include directories that do not exist
279 C ObjC Var(warn_missing_prototypes)
280 Warn about global functions without prototypes
284 Warn about use of multi-character character constants
287 C ObjC Var(warn_nested_externs)
288 Warn about \"extern\" declarations not at file scope
291 C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
292 Warn when non-templatized friend functions are declared within a template
295 C++ ObjC++ Var(warn_nonvdtor)
296 Warn about non-virtual destructors
299 C ObjC Var(warn_nonnull)
300 Warn about NULL being passed to argument slots marked as requiring non-NULL
303 C ObjC C++ ObjC++ Joined
304 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
307 C++ ObjC++ Var(warn_old_style_cast)
308 Warn if a C-style cast is used in a program
310 Wold-style-definition
311 C ObjC Var(warn_old_style_definition)
312 Warn if an old-style parameter definition is used
315 C++ ObjC++ Var(warn_overloaded_virtual)
316 Warn about overloaded virtual function names
319 C ObjC C++ ObjC++ Var(warn_parentheses)
320 Warn about possibly missing parentheses
323 C++ ObjC++ Var(warn_pmf2ptr) Init(1)
324 Warn when converting the type of pointers to member functions
327 C ObjC C++ ObjC++ Var(warn_pointer_arith)
328 Warn about function pointer arithmetic
331 C ObjC Var(warn_pointer_to_int_cast) Init(1)
332 Warn when a pointer is cast to an integer of a different size
335 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1)
336 Warn about misuses of pragmas
339 ObjC ObjC++ Var(warn_protocol) Init(1)
340 Warn if inherited methods are unimplemented
343 C ObjC C++ ObjC++ Var(warn_redundant_decls)
344 Warn about multiple declarations of the same object
347 C++ ObjC++ Var(warn_reorder)
348 Warn when the compiler reorders code
351 C ObjC C++ ObjC++ Var(warn_return_type)
352 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
355 ObjC ObjC++ Var(warn_selector)
356 Warn if a selector has multiple methods
359 C ObjC C++ ObjC++ Var(warn_sequence_point)
360 Warn about possible violations of sequence point rules
363 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
364 Warn about signed-unsigned comparisons
367 C++ ObjC++ Var(warn_sign_promo)
368 Warn when overload promotes from unsigned to signed
370 Wstrict-null-sentinel
372 Warn about uncasted NULL used as sentinel
375 C ObjC Var(warn_strict_prototypes)
376 Warn about unprototyped function declarations
378 Wstrict-selector-match
379 ObjC ObjC++ Var(warn_strict_selector_match)
380 Warn if type signatures of candidate methods do not match exactly
383 C++ ObjC++ Var(warn_synth)
384 Warn when synthesis behavior differs from Cfront
388 Do not suppress warnings from system headers
391 C ObjC Var(warn_traditional)
392 Warn about features not present in traditional C
396 Warn if trigraphs are encountered that might affect the meaning of the program
399 ObjC ObjC++ Var(warn_undeclared_selector)
400 Warn about @selector()s without previously declared methods
404 Warn if an undefined macro is used in an #if directive
408 Warn about unrecognized pragmas
412 Warn about macros defined in the main file that are not used
416 Do not warn about using variadic macros when -pedantic
420 Give strings the type \"array of char\"
423 C ObjC Var(warn_pointer_sign) Init(-1)
424 Warn when a pointer differs in signedness in an assignment
428 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
430 ; This should really just be C++/ObjC++ but we (NetBSD) use it when
431 ; calling C and ObjC compilers as well.
433 C ObjC C++ ObjC++ Joined Separate
434 -cxx-isystem <dir> Add <dir> to the start of the C++ system include path
437 C ObjC C++ ObjC++ Joined
438 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
442 Enforce class member access control semantics
447 falt-external-templates
449 Change when template instances are emitted
453 Recognize the \"asm\" keyword
457 Recognize built-in functions
460 C ObjC C++ ObjC++ Joined
464 Check the return value of new
468 Allow the arguments of the '?' operator to have different types
472 Reduce the size of object files
476 Make string literals \"const char[]\" not \"char[]\"
478 fconstant-string-class=
480 -fconst-string-class=<name> Use class <name> for constant strings
484 Inline member functions by default
486 fdollars-in-identifiers
488 Permit '$' as an identifier character
495 Generate code to check exception specifications
501 C ObjC C++ ObjC++ Joined RejectNegative
502 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
504 fextended-identifiers
506 Permit universal character names (\\u and \\U) in identifiers
509 C ObjC C++ ObjC++ Joined RejectNegative
510 -finput-charset=<cset> Specify the default character set for source files
519 ffixed-line-length-none
527 Scope of for-init-statement variables is local to the loop
531 Do not assume that standard C libraries and \"main\" exist
535 Recognize GNU-defined keywords
539 Generate code for GNU runtime environment
542 C Var(flag_gnu89_inline) Init(-1)
543 Use traditional GNU semantics for inline functions
556 Assume normal C execution environment
560 Enable support for huge objects
564 Export functions even if they can be inlined
566 fimplicit-inline-templates
568 Emit implicit instantiations of inline templates
572 Emit implicit instantiations of templates
575 C++ Var(flag_friend_injection)
576 Inject friend functions into enclosing namespace
583 Don't warn about uses of Microsoft extensions
585 fname-mangling-version-
593 Generate code for NeXT (Apple Mac OS X) runtime environment
597 Assume that receivers of Objective-C messages may be nil
605 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
606 ; to initialize any non-POD ivars in Objective-C++ classes.
607 fobjc-call-cxx-cdtors
608 ObjC++ Var(flag_objc_call_cxx_cdtors)
609 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
611 fobjc-direct-dispatch
612 ObjC ObjC++ Var(flag_objc_direct_dispatch)
613 Allow fast jumps to the message dispatcher
615 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
616 ; @try, etc.) in source code.
618 ObjC ObjC++ Var(flag_objc_exceptions)
619 Enable Objective-C exception and synchronization syntax
622 ObjC ObjC++ Var(flag_objc_gc)
623 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
625 ; Nonzero means that we generate NeXT setjmp based exceptions.
626 fobjc-sjlj-exceptions
627 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
628 Enable Objective-C setjmp exception handling runtime
632 Recognize C++ kewords like \"compl\" and \"xor\"
636 Enable optional diagnostics
643 Look for and use PCH files even when preprocessing
647 Downgrade conformance errors to warnings
651 Treat the input file as already preprocessed
653 freplace-objc-classes
655 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
659 Enable automatic template instantiation
663 Generate run time type descriptor information
667 Use the same size for double as for float
671 Use the narrowest integer type possible for enumeration types
675 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
679 When \"signed\" or \"unsigned\" is not given make the bitfield signed
683 Make \"char\" signed by default
690 Display statistics accumulated during compilation
696 C ObjC C++ ObjC++ Joined RejectNegative UInteger
697 -ftabstop=<number> Distance between tab stops for column reporting
700 C++ ObjC++ Joined RejectNegative UInteger
701 -ftemplate-depth-<number> Specify maximum template instantiation depth
708 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
712 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
716 Make \"char\" unsigned by default
720 Use __cxa_atexit to register destructors
722 fvisibility-inlines-hidden
724 Marks all inlined methods as having hidden visibility
728 Discard unused virtual functions
732 Implement vtables using thunks
736 Emit common-like symbols as weak symbols
739 C ObjC C++ ObjC++ Joined RejectNegative
740 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
744 Generate a #line directive pointing at the current working directory
748 Emit cross referencing information
752 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
756 Dump declarations to a .decl file
759 C ObjC C++ ObjC++ Joined Separate
760 -idirafter <dir> Add <dir> to the end of the system include path
763 C ObjC C++ ObjC++ Joined Separate
764 -imacros <file> Accept definition of macros in <file>
767 C ObjC C++ ObjC++ Joined Separate
768 -include <file> Include the contents of <file> before other files
771 C ObjC C++ ObjC++ Joined Separate
772 -iprefix <path> Specify <path> as a prefix for next two options
775 C ObjC C++ ObjC++ Joined Separate
776 -isysroot <dir> Set <dir> to be the system root directory
779 C ObjC C++ ObjC++ Joined Separate
780 -isystem <dir> Add <dir> to the start of the system include path
783 C ObjC C++ ObjC++ Joined Separate
784 -iquote <dir> Add <dir> to the end of the quote include path
787 C ObjC C++ ObjC++ Joined Separate
788 -iremap <src:dst> Convert <src> to <dst> if it occurs as prefix in __FILE__.
791 C ObjC C++ ObjC++ Joined Separate
792 -iwithprefix <dir> Add <dir> to the end of the system include path
795 C ObjC C++ ObjC++ Joined Separate
796 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
805 C ObjC C++ ObjC++ Undocumented
809 Do not search standard system include directories (those specified with -isystem will still be used)
813 Do not search standard system include directories for C++
816 C ObjC C++ ObjC++ Joined Separate
817 ; Documented in common.opt
821 ; Documented in common.opt
825 ; Documented in common.opt
827 print-objc-runtime-info
829 Generate C header of platform-specific features
833 Print a checksum of the executable for PCH validity checking, and stop
837 Remap file names when including files
841 Conform to the ISO 1998 C++ standard
845 Conform to the ISO 1990 C standard
849 Conform to the ISO 1999 C standard
853 Deprecated in favor of -std=c99
857 Conform to the ISO 1998 C++ standard with GNU extensions
861 Conform to the ISO 1990 C standard with GNU extensions
865 Conform to the ISO 1999 C standard with GNU extensions
869 Deprecated in favor of -std=gnu99
873 Conform to the ISO 1990 C standard
877 Conform to the ISO 1990 C standard as amended in 1994
881 Conform to the ISO 1999 C standard
885 Deprecated in favor of -std=iso9899:1999
889 Enable traditional preprocessing
893 -trigraphs Support ISO C trigraphs
897 Do not predefine system-specific and GCC-specific macros
901 Enable verbose output
905 ; Documented in common.opt
907 ; This comment is to ensure we retain the blank line above.