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[diderot] Annotation of /branches/cuda/config/ax_check_compile_flag.m4
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Annotation of /branches/cuda/config/ax_check_compile_flag.m4

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1 : jhr 5597 # ===========================================================================
2 :     # http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
3 :     # ===========================================================================
4 :     #
5 :     # SYNOPSIS
6 :     #
7 :     # AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
8 :     #
9 :     # DESCRIPTION
10 :     #
11 :     # Check whether the given FLAG works with the current language's compiler
12 :     # or gives an error. (Warnings, however, are ignored)
13 :     #
14 :     # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
15 :     # success/failure.
16 :     #
17 :     # If EXTRA-FLAGS is defined, it is added to the current language's default
18 :     # flags (e.g. CFLAGS) when the check is done. The check is thus made with
19 :     # the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
20 :     # force the compiler to issue an error when a bad flag is given.
21 :     #
22 :     # INPUT gives an alternative input source to AC_COMPILE_IFELSE.
23 :     #
24 :     # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
25 :     # macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
26 :     #
27 :     # LICENSE
28 :     #
29 :     # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
30 :     # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
31 :     #
32 :     # This program is free software: you can redistribute it and/or modify it
33 :     # under the terms of the GNU General Public License as published by the
34 :     # Free Software Foundation, either version 3 of the License, or (at your
35 :     # option) any later version.
36 :     #
37 :     # This program is distributed in the hope that it will be useful, but
38 :     # WITHOUT ANY WARRANTY; without even the implied warranty of
39 :     # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
40 :     # Public License for more details.
41 :     #
42 :     # You should have received a copy of the GNU General Public License along
43 :     # with this program. If not, see <http://www.gnu.org/licenses/>.
44 :     #
45 :     # As a special exception, the respective Autoconf Macro's copyright owner
46 :     # gives unlimited permission to copy, distribute and modify the configure
47 :     # scripts that are the output of Autoconf when processing the Macro. You
48 :     # need not follow the terms of the GNU General Public License when using
49 :     # or distributing such scripts, even though portions of the text of the
50 :     # Macro appear in them. The GNU General Public License (GPL) does govern
51 :     # all other use of the material that constitutes the Autoconf Macro.
52 :     #
53 :     # This special exception to the GPL applies to versions of the Autoconf
54 :     # Macro released by the Autoconf Archive. When you make and distribute a
55 :     # modified version of the Autoconf Macro, you may extend this special
56 :     # exception to the GPL to apply to your modified version as well.
57 :    
58 :     #serial 4
59 :    
60 :     AC_DEFUN([AX_CHECK_COMPILE_FLAG],
61 :     [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
62 :     AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
63 :     AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
64 :     ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
65 :     _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
66 :     AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
67 :     [AS_VAR_SET(CACHEVAR,[yes])],
68 :     [AS_VAR_SET(CACHEVAR,[no])])
69 :     _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
70 :     AS_VAR_IF(CACHEVAR,yes,
71 :     [m4_default([$2], :)],
72 :     [m4_default([$3], :)])
73 :     AS_VAR_POPDEF([CACHEVAR])dnl
74 :     ])dnl AX_CHECK_COMPILE_FLAGS

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