1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003 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
22 ; This file is processed by the script opts.sh. It is a database of
23 ; command line options, with each record separated by a blank line,
24 ; and each field appearing on its own line. The first field is the
25 ; command-line switch with the leading "-" removed. All options
26 ; beginning with "f" or "W" are implicitly assumed to take a "no-"
27 ; form; this form should not be listed. If you do not want this
28 ; negative form and you want it to be automatically rejected, add
29 ; RejectNegative to the second field.
31 ; The second field is a space-separated list of which parts of the
32 ; compiler recognize the switch, as declared by "Language" entries.
33 ; If the switch takes an argument, then you should also specify
34 ; "Joined" and/or "Separate" to indicate where the argument can
35 ; appear. If a Joined argument can legitimately be omitted, specify
36 ; "JoinedOrMissing" instead of "Joined". If the argument to a switch
37 ; is a non-negative integer, you can specify "UInteger" and the switch
38 ; decoder will convert the argument for you, or complain to the user
39 ; if the argument is invalid.
41 ; The third field is the help text to output with --help. This is
42 ; automatically line-wrapped on output. Normally the switch is output
43 ; automatically, with the help text on the right hand side of the
44 ; output. However, if the help text contains a tab character, the
45 ; text to the left of the tab is output instead of the switch, and the
46 ; text to its right forms the help. This is useful for elaborating on
47 ; what type of argument a switch takes, for example. If the second
48 ; field contains "Undocumented" then nothing is output with --help.
49 ; Only do this with good reason like the switch being internal between
50 ; the driver and the front end - it is not an excuse to leave a switch
53 ; Comments can appear on their own line anwhere in the file, preceded
54 ; by a semicolon. Whitespace is permitted before the semicolon.
56 ; For each switch XXX below, an enumeration constant is created by the
57 ; script opts.sh spelt OPT_XXX, but with all non-alphanumeric
58 ; characters replaced with an underscore.
60 ; Please try to keep this file in ASCII collating order.
75 C ObjC C++ ObjC++ Joined Separate
78 C ObjC C++ ObjC++ Joined Separate
79 -A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
83 Do not discard comments
87 Do not discard comments in macro expansions
90 C ObjC C++ ObjC++ Joined Separate
91 -D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
94 C ObjC C++ ObjC++ Undocumented
98 Print the name of header files as they are used
101 C ObjC C++ ObjC++ Joined Separate
102 -I <dir> Add <dir> to the end of the main include path. -I- gives more include path control; see info documentation
106 Generate make dependencies
109 C ObjC C++ ObjC++ Separate
110 Generate make dependencies and compile
113 C ObjC C++ ObjC++ Joined Separate
114 -MF <file> Write dependency output to the given file
118 Treat missing header files as generated files
122 Like -M but ignore system header files
125 C ObjC C++ ObjC++ Separate
126 Like -MD but ignore system header files
130 Generate phony targets for all headers
133 C ObjC C++ ObjC++ Joined Separate
134 -MQ <target> Add a MAKE-quoted target
137 C ObjC C++ ObjC++ Joined Separate
138 -MT <target> Add an unquoted target
142 Do not generate #line directives
145 C ObjC C++ ObjC++ Joined Separate
146 -U<macro> Undefine <macro>
153 Enable most warning messages
157 Warn about casting functions to incompatible types
161 Warn about casts which discard qualifiers
165 Warn about subscripts whose type is \"char\"
169 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
173 Synonym for -Wcomment
177 Warn about possibly confusing type conversions
181 Warn when all constructors and destructors are private
185 Warn about deprecated compiler features
189 Warn about compile-time integer division by zero
193 Warn about violations of Effective C++ style rules
197 Warn about stray tokens after #elif and #endif
201 ; Documented in common.opt
203 Werror-implicit-function-declaration
204 C ObjC RejectNegative
205 Make implicit function declarations an error
209 Warn if testing floating point numbers for equality
213 Warn about printf/scanf/strftime/strfmon format string anomalies
217 Warn if passing too many arguments to a function for its format string
221 Warn about format strings that are not literals
225 Warn about possible security problems with format functions
229 Warn about strftime formats yielding 2-digit years
235 C ObjC C++ ObjC++ Joined
240 Wimplicit-function-declaration
242 Warn about implicit function declarations
246 Warn when a declaration does not specify a type
250 Warn about uses of the \"#import\" directive
254 Warn about invalid uses of the \"offsetof\" macro
258 Warn about PCH files that are found but not used
262 Do not warn about using \"long long\" when -pedantic
266 Warn about suspicious declarations of \"main\"
270 Warn about possibly missing braces around initializers
272 Wmissing-declarations
274 Warn about global functions without previous declarations
276 Wmissing-format-attribute
278 Warn about functions which might be candidates for format attributes
282 Warn about global functions without prototypes
286 Warn about use of multi-character character constants
290 Warn about \"extern\" declarations not at file scope
294 Warn when non-templatized friend functions are declared within a template
298 Warn about non-virtual destructors
305 Warn if a C-style cast is used in a program
309 Warn about overloaded virtual function names
313 Warn about possibly missing parentheses
317 Warn when converting the type of pointers to member functions
321 Warn about function pointer arithmetic
325 Warn if inherited methods are unimplemented
329 Warn about multiple declarations of the same object
333 Warn when the compiler reorders code
337 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
341 Warn if a selector has multiple methods
345 Warn about possible violations of sequence point rules
349 Warn about signed-unsigned comparisons
353 Warn when overload promotes from unsigned to signed
357 Warn about unprototyped function declarations
361 Warn when synthesis behavior differs from Cfront
365 Do not suppress warnings from system headers
369 Warn about features not present in traditional C
373 Warn if trigraphs are encountered that might affect the meaning of the program
380 Warn if an undefined macro is used in an #if directive
384 Warn about unrecognized pragmas
388 Warn about macros defined in the main file that are not used
392 Give strings the type \"array of char\"
396 A synonym for -std=c89. In a future version of GCC it will become synonymous with -std=c99 instead
399 C ObjC C++ ObjC++ Joined
400 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
403 C++ ObjC++ Joined UInteger
407 Enforce class member access control semantics
412 falt-external-templates
414 Change when template instances are emitted
418 Recognize the \"asm\" keyword
422 Recognize built-in functions
425 C ObjC C++ ObjC++ Joined
429 Check the return value of new
433 Allow the arguments of the '?' operator to have different types
437 Reduce the size of object files
441 Make string literals \"const char[]\" not \"char[]\"
443 fconstant-string-class=
445 -fconst-string-class=<name> Use class <name> for constant strings
449 Inline member functions by default
451 fdollars-in-identifiers
453 Permit '$' as an identifier character
456 C ObjC C++ ObjC++ Joined RejectNegative
457 -fdump-<type> Dump various compiler internals to a file
464 Generate code to check exception specifications
470 C ObjC C++ ObjC++ Joined RejectNegative
471 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
484 Scope of for-init-statement variables is local to the loop
488 Do not assume that standard C libraries and \"main\" exist
492 Recognize GNU-defined keywords
496 Generate code for GNU runtime environment
509 Assume normal C execution environment
513 Enable support for huge objects
517 Export functions even if they can be inlined
519 fimplicit-inline-templates
521 Emit implicit instantiations of inline templates
525 Emit implicit instantiations of templates
532 Don't warn about uses of Microsoft extensions
534 fname-mangling-version-
542 Generate code for NeXT runtime environment
552 Recognize C++ kewords like \"compl\" and \"xor\"
556 Enable optional diagnostics
563 Downgrade conformance errors to warnings
567 Treat the input file as already preprocessed
571 Enable automatic template instantiation
575 Generate run time type descriptor information
579 Use the same size for double as for float
583 Use the narrowest integer type possible for enumeration types
587 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
594 When \"signed\" or \"unsigned\" is not given make the bitfield signed
598 Make \"char\" signed by default
605 Display statistics accumulated during compilation
611 C ObjC C++ ObjC++ Joined RejectNegative UInteger
612 -ftabstop=<number> Distance between tab stops for column reporting
615 C++ ObjC++ Joined RejectNegative UInteger
616 -ftemplate-depth-<number> Specify maximum template instantiation depth
623 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
627 Make \"char\" unsigned by default
631 Use __cxa_atexit to register destructors
635 Discard unused virtual functions
639 Implement vtables using thunks
643 Emit common-like symbols as weak symbols
646 C ObjC C++ ObjC++ Joined RejectNegative
647 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
651 Emit cross referencing information
655 Dump declarations to a .decl file
658 C ObjC C++ ObjC++ Joined Separate
659 -idirafter <dir> Add <dir> to the end of the system include path
662 C ObjC C++ ObjC++ Joined Separate
663 -imacros <file> Accept definition of macros in <file>
666 C ObjC C++ ObjC++ Joined Separate
667 -include <file> Include the contents of <file> before other files
670 C ObjC C++ ObjC++ Joined Separate
671 -iprefix <path> Specify <path> as a prefix for next two options
674 C ObjC C++ ObjC++ Joined Separate
675 -isysroot <dir> Set <dir> to be the system root directory
678 C ObjC C++ ObjC++ Joined Separate
679 -isystem <dir> Add <dir> to the start of the system include path
682 C ObjC C++ ObjC++ Joined Separate
683 -iwithprefix <dir> Add <dir> to the end of the system include path
686 C ObjC C++ ObjC++ Joined Separate
687 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
693 C ObjC C++ ObjC++ Undocumented
697 Do not search standard system include directories (those specified with -isystem will still be used)
701 Do not search standard system include directories for C++
704 C ObjC C++ ObjC++ Joined Separate
705 ; Documented in common.opt
709 ; Documented in common.opt
713 ; Documented in common.opt
715 print-objc-runtime-info
717 Generate C header of platform-specific features
721 Remap file names when including files
725 Conform to the ISO 1998 C++ standard
729 Conform to the ISO 1990 C standard
733 Conform to the ISO 1999 C standard
737 Deprecated in favor of -std=c99
741 Conform to the ISO 1998 C++ standard with GNU extensions
745 Conform to the ISO 1990 C standard with GNU extensions
749 Conform to the ISO 1999 C standard with GNU extensions
753 Deprecated in favor of -std=gnu99
757 Deprecated in favor of -std=c89
761 Conform to the ISO 1990 C standard as amended in 1994
765 Deprecated in favor of -std=c99
769 Deprecated in favor of -std=c99
773 Enable traditional preprocessing
777 -trigraphs Support ISO C trigraphs
781 Do not predefine system-specific and GCC-specific macros
785 Enable verbose output
789 ; Documented in common.opt
791 ; This comment is to ensure we retain the blank line above.