1# ===========================================================================
2#       http://www.gnu.org/software/autoconf-archive/ax_gcc_option.html
3# ===========================================================================
4#
5# OBSOLETE MACRO
6#
7#   Deprecated in favor of AX_C_CHECK_FLAG, AX_CXX_CHECK_FLAG,
8#   AX_CPP_CHECK_FLAG, AX_CXXCPP_CHECK_FLAG and AX_LD_CHECK_FLAG.
9#
10# SYNOPSIS
11#
12#   AX_GCC_OPTION(OPTION,EXTRA-OPTIONS,TEST-PROGRAM,ACTION-IF-SUCCESSFUL,ACTION-IF-NOT-SUCCESFUL)
13#
14# DESCRIPTION
15#
16#   AX_GCC_OPTION checks wheter gcc accepts the passed OPTION. If it accepts
17#   the OPTION then ACTION-IF-SUCCESSFUL will be executed, otherwise
18#   ACTION-IF-UNSUCCESSFUL.
19#
20#   A typical usage should be the following one:
21#
22#     AX_GCC_OPTION([-fomit-frame-pointer],[],[],[
23#       AC_MSG_NOTICE([The option is supported])],[
24#       AC_MSG_NOTICE([No luck this time])
25#     ])
26#
27#   The macro doesn't discriminate between languages so, if you are testing
28#   for an option that works for C++ but not for C you should use '-x c++'
29#   as EXTRA-OPTIONS:
30#
31#     AX_GCC_OPTION([-fno-rtti],[-x c++],[],[ ... ],[ ... ])
32#
33#   OPTION is tested against the following code:
34#
35#     int main()
36#     {
37#             return 0;
38#     }
39#
40#   The optional TEST-PROGRAM comes handy when the default main() is not
41#   suited for the option being checked
42#
43#   So, if you need to test for -fstrict-prototypes option you should
44#   probably use the macro as follows:
45#
46#     AX_GCC_OPTION([-fstrict-prototypes],[-x c++],[
47#       int main(int argc, char ** argv)
48#       {
49#               (void) argc;
50#               (void) argv;
51#
52#               return 0;
53#       }
54#     ],[ ... ],[ ... ])
55#
56#   Note that the macro compiles but doesn't link the test program so it is
57#   not suited for checking options that are passed to the linker, like:
58#
59#     -Wl,-L<a-library-path>
60#
61#   In order to avoid such kind of problems you should think about usinguse
62#   the AX_*_CHECK_FLAG family macros
63#
64# LICENSE
65#
66#   Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
67#   Copyright (c) 2008 Bogdan Drozdowski <bogdandr@op.pl>
68#
69#   This program is free software; you can redistribute it and/or modify it
70#   under the terms of the GNU General Public License as published by the
71#   Free Software Foundation; either version 2 of the License, or (at your
72#   option) any later version.
73#
74#   This program is distributed in the hope that it will be useful, but
75#   WITHOUT ANY WARRANTY; without even the implied warranty of
76#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
77#   Public License for more details.
78#
79#   You should have received a copy of the GNU General Public License along
80#   with this program. If not, see <http://www.gnu.org/licenses/>.
81#
82#   As a special exception, the respective Autoconf Macro's copyright owner
83#   gives unlimited permission to copy, distribute and modify the configure
84#   scripts that are the output of Autoconf when processing the Macro. You
85#   need not follow the terms of the GNU General Public License when using
86#   or distributing such scripts, even though portions of the text of the
87#   Macro appear in them. The GNU General Public License (GPL) does govern
88#   all other use of the material that constitutes the Autoconf Macro.
89#
90#   This special exception to the GPL applies to versions of the Autoconf
91#   Macro released by the Autoconf Archive. When you make and distribute a
92#   modified version of the Autoconf Macro, you may extend this special
93#   exception to the GPL to apply to your modified version as well.
94
95#serial 13
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])
131