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 C++ 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 C++ ObjC++ Var(warn_overlength_strings) Init(-1)
316 Warn if a string is longer than the maximum portable length specified by the standard
319 C++ ObjC++ Var(warn_overloaded_virtual)
320 Warn about overloaded virtual function names
323 C ObjC C++ ObjC++ Var(warn_parentheses)
324 Warn about possibly missing parentheses
327 C++ ObjC++ Var(warn_pmf2ptr) Init(1)
328 Warn when converting the type of pointers to member functions
331 C ObjC C++ ObjC++ Var(warn_pointer_arith)
332 Warn about function pointer arithmetic
335 C ObjC Var(warn_pointer_to_int_cast) Init(1)
336 Warn when a pointer is cast to an integer of a different size
339 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1)
340 Warn about misuses of pragmas
343 ObjC ObjC++ Var(warn_protocol) Init(1)
344 Warn if inherited methods are unimplemented
347 C ObjC C++ ObjC++ Var(warn_redundant_decls)
348 Warn about multiple declarations of the same object
351 C++ ObjC++ Var(warn_reorder)
352 Warn when the compiler reorders code
355 C ObjC C++ ObjC++ Var(warn_return_type)
356 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
359 ObjC ObjC++ Var(warn_selector)
360 Warn if a selector has multiple methods
363 C ObjC C++ ObjC++ Var(warn_sequence_point)
364 Warn about possible violations of sequence point rules
367 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
368 Warn about signed-unsigned comparisons
371 C++ ObjC++ Var(warn_sign_promo)
372 Warn when overload promotes from unsigned to signed
374 Wstrict-null-sentinel
376 Warn about uncasted NULL used as sentinel
379 C ObjC Var(warn_strict_prototypes)
380 Warn about unprototyped function declarations
382 Wstrict-selector-match
383 ObjC ObjC++ Var(warn_strict_selector_match)
384 Warn if type signatures of candidate methods do not match exactly
387 C++ ObjC++ Var(warn_synth)
388 Warn when synthesis behavior differs from Cfront
392 Do not suppress warnings from system headers
395 C ObjC Var(warn_traditional)
396 Warn about features not present in traditional C
400 Warn if trigraphs are encountered that might affect the meaning of the program
403 ObjC ObjC++ Var(warn_undeclared_selector)
404 Warn about @selector()s without previously declared methods
408 Warn if an undefined macro is used in an #if directive
412 Warn about unrecognized pragmas
416 Warn about macros defined in the main file that are not used
420 Do not warn about using variadic macros when -pedantic
423 C ObjC C++ ObjC++ Var(warn_write_strings)
424 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.
427 C ObjC Var(warn_pointer_sign) Init(-1)
428 Warn when a pointer differs in signedness in an assignment
432 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
435 C ObjC C++ ObjC++ Joined
436 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
440 Enforce class member access control semantics
445 falt-external-templates
447 Change when template instances are emitted
451 Recognize the \"asm\" keyword
455 Recognize built-in functions
458 C ObjC C++ ObjC++ Joined
462 Check the return value of new
466 Allow the arguments of the '?' operator to have different types
470 Reduce the size of object files
472 fconstant-string-class=
474 -fconst-string-class=<name> Use class <name> for constant strings
478 Inline member functions by default
480 fdollars-in-identifiers
482 Permit '$' as an identifier character
489 Generate code to check exception specifications
495 C ObjC C++ ObjC++ Joined RejectNegative
496 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
498 fextended-identifiers
500 Permit universal character names (\\u and \\U) in identifiers
503 C ObjC C++ ObjC++ Joined RejectNegative
504 -finput-charset=<cset> Specify the default character set for source files
513 ffixed-line-length-none
521 Scope of for-init-statement variables is local to the loop
525 Do not assume that standard C libraries and \"main\" exist
529 Recognize GNU-defined keywords
533 Generate code for GNU runtime environment
546 Assume normal C execution environment
550 Enable support for huge objects
554 Export functions even if they can be inlined
556 fimplicit-inline-templates
558 Emit implicit instantiations of inline templates
562 Emit implicit instantiations of templates
565 C++ Var(flag_friend_injection)
566 Inject friend functions into enclosing namespace
573 Don't warn about uses of Microsoft extensions
575 fname-mangling-version-
583 Generate code for NeXT (Apple Mac OS X) runtime environment
587 Assume that receivers of Objective-C messages may be nil
595 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
596 ; to initialize any non-POD ivars in Objective-C++ classes.
597 fobjc-call-cxx-cdtors
598 ObjC++ Var(flag_objc_call_cxx_cdtors)
599 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
601 fobjc-direct-dispatch
602 ObjC ObjC++ Var(flag_objc_direct_dispatch)
603 Allow fast jumps to the message dispatcher
605 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
606 ; @try, etc.) in source code.
608 ObjC ObjC++ Var(flag_objc_exceptions)
609 Enable Objective-C exception and synchronization syntax
612 ObjC ObjC++ Var(flag_objc_gc)
613 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
615 ; Nonzero means that we generate NeXT setjmp based exceptions.
616 fobjc-sjlj-exceptions
617 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
618 Enable Objective-C setjmp exception handling runtime
621 C ObjC C++ ObjC++ Var(flag_openmp)
626 Recognize C++ kewords like \"compl\" and \"xor\"
630 Enable optional diagnostics
637 Look for and use PCH files even when preprocessing
641 Downgrade conformance errors to warnings
645 Treat the input file as already preprocessed
647 freplace-objc-classes
649 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
653 Enable automatic template instantiation
657 Generate run time type descriptor information
661 Use the same size for double as for float
665 Use the narrowest integer type possible for enumeration types
669 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
673 When \"signed\" or \"unsigned\" is not given make the bitfield signed
677 Make \"char\" signed by default
684 Display statistics accumulated during compilation
690 C ObjC C++ ObjC++ Joined RejectNegative UInteger
691 -ftabstop=<number> Distance between tab stops for column reporting
694 C++ ObjC++ Joined RejectNegative UInteger
695 -ftemplate-depth-<number> Specify maximum template instantiation depth
702 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
706 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
710 Make \"char\" unsigned by default
714 Use __cxa_atexit to register destructors
716 fuse-cxa-get-exception-ptr
718 Use __cxa_get_exception_ptr in exception handling
720 fvisibility-inlines-hidden
722 Marks all inlined methods as having hidden visibility
726 Discard unused virtual functions
730 Implement vtables using thunks
734 Emit common-like symbols as weak symbols
737 C ObjC C++ ObjC++ Joined RejectNegative
738 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
742 Generate a #line directive pointing at the current working directory
746 Emit cross referencing information
750 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
754 Dump declarations to a .decl file
757 C ObjC C++ ObjC++ Joined Separate
758 -idirafter <dir> Add <dir> to the end of the system include path
761 C ObjC C++ ObjC++ Joined Separate
762 -imacros <file> Accept definition of macros in <file>
765 C ObjC C++ ObjC++ Joined Separate
766 -imultilib <dir> Set <dir> to be the multilib include subdirectory
769 C ObjC C++ ObjC++ Joined Separate
770 -include <file> Include the contents of <file> before other files
773 C ObjC C++ ObjC++ Joined Separate
774 -iprefix <path> Specify <path> as a prefix for next two options
777 C ObjC C++ ObjC++ Joined Separate
778 -isysroot <dir> Set <dir> to be the system root directory
781 C ObjC C++ ObjC++ Joined Separate
782 -isystem <dir> Add <dir> to the start of the system include path
785 C ObjC C++ ObjC++ Joined Separate
786 -iquote <dir> Add <dir> to the end of the quote include path
789 C ObjC C++ ObjC++ Joined Separate
790 -iwithprefix <dir> Add <dir> to the end of the system include path
793 C ObjC C++ ObjC++ Joined Separate
794 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
803 C ObjC C++ ObjC++ Undocumented
807 Do not search standard system include directories (those specified with -isystem will still be used)
811 Do not search standard system include directories for C++
814 C ObjC C++ ObjC++ Joined Separate
815 ; Documented in common.opt
819 ; Documented in common.opt
823 ; Documented in common.opt
825 print-objc-runtime-info
827 Generate C header of platform-specific features
831 Print a checksum of the executable for PCH validity checking, and stop
835 Remap file names when including files
839 Conform to the ISO 1998 C++ standard
843 Conform to the ISO 1990 C standard
847 Conform to the ISO 1999 C standard
851 Deprecated in favor of -std=c99
855 Conform to the ISO 1998 C++ standard with GNU extensions
859 Conform to the ISO 1990 C standard with GNU extensions
863 Conform to the ISO 1999 C standard with GNU extensions
867 Deprecated in favor of -std=gnu99
871 Conform to the ISO 1990 C standard
875 Conform to the ISO 1990 C standard as amended in 1994
879 Conform to the ISO 1999 C standard
883 Deprecated in favor of -std=iso9899:1999
887 Enable traditional preprocessing
891 -trigraphs Support ISO C trigraphs
895 Do not predefine system-specific and GCC-specific macros
899 Enable verbose output
903 ; Documented in common.opt
905 ; This comment is to ensure we retain the blank line above.