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1# ===========================================================================
2# http://autoconf-archive.cryp.to/ax_gcc_option.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AX_GCC_OPTION(OPTION,EXTRA-OPTIONS,TEST-PROGRAM,ACTION-IF-SUCCESSFUL,ACTION-IF-NOT-SUCCESFUL)
8#
9# DESCRIPTION
10#
11# AX_GCC_OPTION checks wheter gcc accepts the passed OPTION. If it accepts
12# the OPTION then ACTION-IF-SUCCESSFUL will be executed, otherwise
13# ACTION-IF-UNSUCCESSFUL.
14#
15# NOTE: This macro will be obsoleted by AX_C_CHECK_FLAG AX_CXX_CHECK_FLAG,
16# AX_CPP_CHECK_FLAG, AX_CXXCPP_CHECK_FLAG and AX_LD_CHECK_FLAG.
17#
18# A typical usage should be the following one:
19#
20# AX_GCC_OPTION([-fomit-frame-pointer],[],[],[
21# AC_MSG_NOTICE([The option is supported])],[
22# AC_MSG_NOTICE([No luck this time])
23# ])
24#
25# The macro doesn't discriminate between languages so, if you are testing
26# for an option that works for C++ but not for C you should use '-x c++'
27# as EXTRA-OPTIONS:
28#
29# AX_GCC_OPTION([-fno-rtti],[-x c++],[],[ ... ],[ ... ])
30#
31# OPTION is tested against the following code:
32#
33# int main()
34# {
35# return 0;
36# }
37#
38# The optional TEST-PROGRAM comes handy when the default main() is not
39# suited for the option being checked
40#
41# So, if you need to test for -fstrict-prototypes option you should
42# probably use the macro as follows:
43#
44# AX_GCC_OPTION([-fstrict-prototypes],[-x c++],[
45# int main(int argc, char ** argv)
46# {
47# (void) argc;
48# (void) argv;
49#
50# return 0;
51# }
52# ],[ ... ],[ ... ])
53#
54# Note that the macro compiles but doesn't link the test program so it is
55# not suited for checking options that are passed to the linker, like:
56#
57# -Wl,-L<a-library-path>
58#
59# In order to avoid such kind of problems you should think about usinguse
60# the AX_*_CHECK_FLAG family macros
61#
62# LAST MODIFICATION
63#
64# 2008-04-12
65#
66# COPYLEFT
67#
68# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
69# Copyright (c) 2008 Bogdan Drozdowski <bogdandr@op.pl>
70#
71# This program is free software; you can redistribute it and/or modify it
72# under the terms of the GNU General Public License as published by the
73# Free Software Foundation; either version 2 of the License, or (at your
74# option) any later version.
75#
76# This program is distributed in the hope that it will be useful, but
77# WITHOUT ANY WARRANTY; without even the implied warranty of
78# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
79# Public License for more details.
80#
81# You should have received a copy of the GNU General Public License along
82# with this program. If not, see <http://www.gnu.org/licenses/>.
83#
84# As a special exception, the respective Autoconf Macro's copyright owner
85# gives unlimited permission to copy, distribute and modify the configure
86# scripts that are the output of Autoconf when processing the Macro. You
87# need not follow the terms of the GNU General Public License when using
88# or distributing such scripts, even though portions of the text of the
89# Macro appear in them. The GNU General Public License (GPL) does govern
90# all other use of the material that constitutes the Autoconf Macro.
91#
92# This special exception to the GPL applies to versions of the Autoconf
93# Macro released by the Autoconf Macro Archive. When you make and
94# distribute a modified version of the Autoconf Macro, you may extend this
95# special exception to the GPL to apply to your modified version as well.
96
97AC_DEFUN([AX_GCC_OPTION], [
98 AC_REQUIRE([AC_PROG_CC])
99
100 AC_MSG_CHECKING([if gcc accepts $1 option])
101
102 AS_IF([ test "x$GCC" = "xyes" ],[
103 AS_IF([ test -z "$3" ],[
104 ax_gcc_option_test="int main()
105{
106 return 0;
107}"
108 ],[
109 ax_gcc_option_test="$3"
110 ])
111
112 # Dump the test program to file
113 cat <<EOF > conftest.c
114$ax_gcc_option_test
115EOF
116
117 # Dump back the file to the log, useful for debugging purposes
118 AC_TRY_COMMAND(cat conftest.c 1>&AS_MESSAGE_LOG_FD)
119
120 AS_IF([ AC_TRY_COMMAND($CC $2 $1 -c conftest.c 1>&AS_MESSAGE_LOG_FD) ],[
121 AC_MSG_RESULT([yes])
122 $4
123 ],[
124 AC_MSG_RESULT([no])
125 $5
126 ])
127 ],[
128 AC_MSG_RESULT([no gcc available])
129 ])
130])