source: trunk/m4/ax_ld_check_flag.m4 @ 1199

Last change on this file since 1199 was 1190, checked in by Peter Johansson, 11 years ago

update to latest autuconf macro archive

File size: 3.0 KB
Line 
1# ===========================================================================
2#     http://www.gnu.org/software/autoconf-archive/ax_ld_check_flag.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_LD_CHECK_FLAG(FLAG-TO-CHECK,[PROLOGUE],[BODY],[ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
8#
9# DESCRIPTION
10#
11#   This macro tests if the C++ compiler supports the flag FLAG-TO-CHECK. If
12#   successfull execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.
13#   PROLOGUE and BODY are optional and should be used as in AC_LANG_PROGRAM
14#   macro.
15#
16#   Example:
17#
18#     AX_LD_CHECK_FLAG([-Wl,-L/usr/lib],[],[],[
19#       ...
20#     ],[
21#       ...
22#     ])
23#
24#   This code is inspired from KDE_CHECK_COMPILER_FLAG macro. Thanks to
25#   Bogdan Drozdowski <bogdandr@op.pl> for testing and bug fixes.
26#
27# LICENSE
28#
29#   Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
30#
31#   This program is free software; you can redistribute it and/or modify it
32#   under the terms of the GNU General Public License as published by the
33#   Free Software Foundation; either version 2 of the License, or (at your
34#   option) any later version.
35#
36#   This program is distributed in the hope that it will be useful, but
37#   WITHOUT ANY WARRANTY; without even the implied warranty of
38#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
39#   Public License for more details.
40#
41#   You should have received a copy of the GNU General Public License along
42#   with this program. If not, see <http://www.gnu.org/licenses/>.
43#
44#   As a special exception, the respective Autoconf Macro's copyright owner
45#   gives unlimited permission to copy, distribute and modify the configure
46#   scripts that are the output of Autoconf when processing the Macro. You
47#   need not follow the terms of the GNU General Public License when using
48#   or distributing such scripts, even though portions of the text of the
49#   Macro appear in them. The GNU General Public License (GPL) does govern
50#   all other use of the material that constitutes the Autoconf Macro.
51#
52#   This special exception to the GPL applies to versions of the Autoconf
53#   Macro released by the Autoconf Archive. When you make and distribute a
54#   modified version of the Autoconf Macro, you may extend this special
55#   exception to the GPL to apply to your modified version as well.
56
57#serial 6
58
59AC_DEFUN([AX_LD_CHECK_FLAG],[
60  AC_PREREQ([2.61])
61  AC_REQUIRE([AC_PROG_CXX])
62  AC_REQUIRE([AC_PROG_SED])
63
64  flag=`echo "$1" | $SED 'y% .=/+-(){}<>:*,%_______________%'`
65
66  AC_CACHE_CHECK([whether the linker accepts the $1 flag],
67    [ax_cv_ld_check_flag_$flag],[
68
69    #AC_LANG_PUSH([C])
70
71    save_LDFLAGS="$LDFLAGS"
72    LDFLAGS="$LDFLAGS $1"
73    AC_LINK_IFELSE([
74      AC_LANG_PROGRAM([$2],[$3])
75    ],[
76      eval "ax_cv_ld_check_flag_$flag=yes"
77    ],[
78      eval "ax_cv_ld_check_flag_$flag=no"
79    ])
80
81    LDFLAGS="$save_LDFLAGS"
82
83    #AC_LANG_POP
84
85  ])
86
87  AS_IF([eval "test \"`echo '$ax_cv_ld_check_flag_'$flag`\" = yes"],[
88    :
89    $4
90  ],[
91    :
92    $5
93  ])
94])
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