1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_gcc_option.html
3 # ===========================================================================
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.
12 # AX_GCC_OPTION(OPTION,EXTRA-OPTIONS,TEST-PROGRAM,ACTION-IF-SUCCESSFUL,ACTION-IF-NOT-SUCCESFUL)
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.
20 # A typical usage should be the following one:
22 # AX_GCC_OPTION([-fomit-frame-pointer],[],[],[
23 # AC_MSG_NOTICE([The option is supported])],[
24 # AC_MSG_NOTICE([No luck this time])
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++'
31 # AX_GCC_OPTION([-fno-rtti],[-x c++],[],[ ... ],[ ... ])
33 # OPTION is tested against the following code:
40 # The optional TEST-PROGRAM comes handy when the default main() is not
41 # suited for the option being checked
43 # So, if you need to test for -fstrict-prototypes option you should
44 # probably use the macro as follows:
46 # AX_GCC_OPTION([-fstrict-prototypes],[-x c++],[
47 # int main(int argc, char ** argv)
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:
59 # -Wl,-L<a-library-path>
61 # In order to avoid such kind of problems you should think about usinguse
62 # the AX_*_CHECK_FLAG family macros
66 # Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
67 # Copyright (c) 2008 Bogdan Drozdowski <bogdandr@op.pl>
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.
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.
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/>.
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.
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.
97 AC_DEFUN([AX_GCC_OPTION], [
98 AC_REQUIRE([AC_PROG_CC])
100 AC_MSG_CHECKING([if gcc accepts $1 option])
102 AS_IF([ test "x$GCC" = "xyes" ],[
103 AS_IF([ test -z "$3" ],[
104 ax_gcc_option_test="int main()
109 ax_gcc_option_test="$3"
112 # Dump the test program to file
113 cat <<EOF > conftest.c
117 # Dump back the file to the log, useful for debugging purposes
118 AC_TRY_COMMAND(cat conftest.c 1>&AS_MESSAGE_LOG_FD)
120 AS_IF([ AC_TRY_COMMAND($CC $2 $1 -c conftest.c 1>&AS_MESSAGE_LOG_FD) ],[
128 AC_MSG_RESULT([no gcc available])