1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003, 2004, 2005 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, 59 Temple Place - Suite 330, 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 ObjC ObjC++ Var(warn_protocol) Init(1)
336 Warn if inherited methods are unimplemented
339 C ObjC C++ ObjC++ Var(warn_redundant_decls)
340 Warn about multiple declarations of the same object
343 C++ ObjC++ Var(warn_reorder)
344 Warn when the compiler reorders code
347 C ObjC C++ ObjC++ Var(warn_return_type)
348 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
351 ObjC ObjC++ Var(warn_selector)
352 Warn if a selector has multiple methods
355 C ObjC C++ ObjC++ Var(warn_sequence_point)
356 Warn about possible violations of sequence point rules
359 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
360 Warn about signed-unsigned comparisons
363 C++ ObjC++ Var(warn_sign_promo)
364 Warn when overload promotes from unsigned to signed
366 Wstrict-null-sentinel
368 Warn about uncasted NULL used as sentinel
371 C ObjC Var(warn_strict_prototypes)
372 Warn about unprototyped function declarations
374 Wstrict-selector-match
375 ObjC ObjC++ Var(warn_strict_selector_match)
376 Warn if type signatures of candidate methods do not match exactly
379 C++ ObjC++ Var(warn_synth)
380 Warn when synthesis behavior differs from Cfront
384 Do not suppress warnings from system headers
387 C ObjC Var(warn_traditional)
388 Warn about features not present in traditional C
392 Warn if trigraphs are encountered that might affect the meaning of the program
395 ObjC ObjC++ Var(warn_undeclared_selector)
396 Warn about @selector()s without previously declared methods
400 Warn if an undefined macro is used in an #if directive
404 Warn about unrecognized pragmas
408 Warn about macros defined in the main file that are not used
412 Do not warn about using variadic macros when -pedantic
416 Give strings the type \"array of char\"
419 C ObjC Var(warn_pointer_sign) Init(1)
420 Warn when a pointer differs in signedness in an assignment.
424 A synonym for -std=c89 (for C) or -std=c++98 (for C++).
427 C ObjC C++ ObjC++ Joined
428 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
432 Enforce class member access control semantics
437 falt-external-templates
439 Change when template instances are emitted
443 Recognize the \"asm\" keyword
447 Recognize built-in functions
450 C ObjC C++ ObjC++ Joined
454 Check the return value of new
458 Allow the arguments of the '?' operator to have different types
462 Reduce the size of object files
466 Make string literals \"const char[]\" not \"char[]\"
468 fconstant-string-class=
470 -fconst-string-class=<name> Use class <name> for constant strings
474 Inline member functions by default
476 fdollars-in-identifiers
478 Permit '$' as an identifier character
485 Generate code to check exception specifications
491 C ObjC C++ ObjC++ Joined RejectNegative
492 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
495 C ObjC C++ ObjC++ Joined RejectNegative
496 -finput-charset=<cset> Specify the default character set for source files.
510 Scope of for-init-statement variables is local to the loop
514 Do not assume that standard C libraries and \"main\" exist
518 Recognize GNU-defined keywords
522 Generate code for GNU runtime environment
535 Assume normal C execution environment
539 Enable support for huge objects
543 Export functions even if they can be inlined
545 fimplicit-inline-templates
547 Emit implicit instantiations of inline templates
551 Emit implicit instantiations of templates
558 Don't warn about uses of Microsoft extensions
560 fname-mangling-version-
568 Generate code for NeXT (Apple Mac OS X) runtime environment
572 Assume that receivers of Objective-C messages may be nil
580 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
581 ; to initialize any non-POD ivars in Objective-C++ classes.
582 fobjc-call-cxx-cdtors
583 ObjC++ Var(flag_objc_call_cxx_cdtors)
584 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
586 fobjc-direct-dispatch
587 ObjC ObjC++ Var(flag_objc_direct_dispatch)
588 Allow fast jumps to the message dispatcher
590 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
591 ; @try, etc.) in source code.
593 ObjC ObjC++ Var(flag_objc_exceptions)
594 Enable Objective-C exception and synchronization syntax
597 ObjC ObjC++ Var(flag_objc_gc)
598 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
600 ; Nonzero means that we generate NeXT setjmp based exceptions.
601 fobjc-sjlj-exceptions
602 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
603 Enable Objective-C setjmp exception handling runtime
607 Recognize C++ kewords like \"compl\" and \"xor\"
611 Enable optional diagnostics
618 Look for and use PCH files even when preprocessing
622 Downgrade conformance errors to warnings
626 Treat the input file as already preprocessed
628 freplace-objc-classes
630 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
634 Enable automatic template instantiation
638 Generate run time type descriptor information
642 Use the same size for double as for float
646 Use the narrowest integer type possible for enumeration types
650 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
654 When \"signed\" or \"unsigned\" is not given make the bitfield signed
658 Make \"char\" signed by default
665 Display statistics accumulated during compilation
671 C ObjC C++ ObjC++ Joined RejectNegative UInteger
672 -ftabstop=<number> Distance between tab stops for column reporting
675 C++ ObjC++ Joined RejectNegative UInteger
676 -ftemplate-depth-<number> Specify maximum template instantiation depth
683 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics.
687 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
691 Make \"char\" unsigned by default
695 Use __cxa_atexit to register destructors
697 fvisibility-inlines-hidden
699 Marks all inlined methods as having hidden visibility
703 Discard unused virtual functions
707 Implement vtables using thunks
711 Emit common-like symbols as weak symbols
714 C ObjC C++ ObjC++ Joined RejectNegative
715 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
719 Generate a #line directive pointing at the current working directory
723 Emit cross referencing information
727 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
731 Dump declarations to a .decl file
734 C ObjC C++ ObjC++ Joined Separate
735 -idirafter <dir> Add <dir> to the end of the system include path
738 C ObjC C++ ObjC++ Joined Separate
739 -imacros <file> Accept definition of macros in <file>
742 C ObjC C++ ObjC++ Joined Separate
743 -include <file> Include the contents of <file> before other files
746 C ObjC C++ ObjC++ Joined Separate
747 -iprefix <path> Specify <path> as a prefix for next two options
750 C ObjC C++ ObjC++ Joined Separate
751 -isysroot <dir> Set <dir> to be the system root directory
754 C ObjC C++ ObjC++ Joined Separate
755 -isystem <dir> Add <dir> to the start of the system include path
758 C ObjC C++ ObjC++ Joined Separate
759 -iquote <dir> Add <dir> to the end of the quote include path
762 C ObjC C++ ObjC++ Joined Separate
763 -iwithprefix <dir> Add <dir> to the end of the system include path
766 C ObjC C++ ObjC++ Joined Separate
767 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
773 C ObjC C++ ObjC++ Undocumented
777 Do not search standard system include directories (those specified with -isystem will still be used)
781 Do not search standard system include directories for C++
784 C ObjC C++ ObjC++ Joined Separate
785 ; Documented in common.opt
789 ; Documented in common.opt
793 ; Documented in common.opt
795 print-objc-runtime-info
797 Generate C header of platform-specific features
801 Print a checksum of the executable for PCH validity checking, and stop.
805 Remap file names when including files
809 Conform to the ISO 1998 C++ standard
813 Conform to the ISO 1990 C standard
817 Conform to the ISO 1999 C standard
821 Deprecated in favor of -std=c99
825 Conform to the ISO 1998 C++ standard with GNU extensions
829 Conform to the ISO 1990 C standard with GNU extensions
833 Conform to the ISO 1999 C standard with GNU extensions
837 Deprecated in favor of -std=gnu99
841 Conform to the ISO 1990 C standard
845 Conform to the ISO 1990 C standard as amended in 1994
849 Conform to the ISO 1999 C standard
853 Deprecated in favor of -std=iso9899:1999
857 Enable traditional preprocessing
861 -trigraphs Support ISO C trigraphs
865 Do not predefine system-specific and GCC-specific macros
869 Enable verbose output
873 ; Documented in common.opt
875 ; This comment is to ensure we retain the blank line above.