# ===========================================================================

#       http://www.gnu.org/software/autoconf-archive/ax_gcc_option.html

# ===========================================================================

#

# OBSOLETE MACRO

#

#   Deprecated in favor of AX_C_CHECK_FLAG, AX_CXX_CHECK_FLAG,

#   AX_CPP_CHECK_FLAG, AX_CXXCPP_CHECK_FLAG and AX_LD_CHECK_FLAG.

#

# SYNOPSIS

#

#   AX_GCC_OPTION(OPTION,EXTRA-OPTIONS,TEST-PROGRAM,ACTION-IF-SUCCESSFUL,ACTION-IF-NOT-SUCCESFUL)

#

# DESCRIPTION

#

#   AX_GCC_OPTION checks wheter gcc accepts the passed OPTION. If it accepts

#   the OPTION then ACTION-IF-SUCCESSFUL will be executed, otherwise

#   ACTION-IF-UNSUCCESSFUL.

#

#   A typical usage should be the following one:

#

#     AX_GCC_OPTION([-fomit-frame-pointer],[],[],[

#       AC_MSG_NOTICE([The option is supported])],[

#       AC_MSG_NOTICE([No luck this time])

#     ])

#

#   The macro doesn't discriminate between languages so, if you are testing

#   for an option that works for C++ but not for C you should use '-x c++'

#   as EXTRA-OPTIONS:

#

#     AX_GCC_OPTION([-fno-rtti],[-x c++],[],[ ... ],[ ... ])

#

#   OPTION is tested against the following code:

#

#     int main()

#     {

#             return 0;

#     }

#

#   The optional TEST-PROGRAM comes handy when the default main() is not

#   suited for the option being checked

#

#   So, if you need to test for -fstrict-prototypes option you should

#   probably use the macro as follows:

#

#     AX_GCC_OPTION([-fstrict-prototypes],[-x c++],[

#       int main(int argc, char ** argv)

#       {

#               (void) argc;

#               (void) argv;

#

#               return 0;

#       }

#     ],[ ... ],[ ... ])

#

#   Note that the macro compiles but doesn't link the test program so it is

#   not suited for checking options that are passed to the linker, like:

#

#     -Wl,-L<a-library-path>

#

#   In order to avoid such kind of problems you should think about usinguse

#   the AX_*_CHECK_FLAG family macros

#

# LICENSE

#

#   Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>

#   Copyright (c) 2008 Bogdan Drozdowski <bogdandr@op.pl>

#

#   This program is free software; you can redistribute it and/or modify it

#   under the terms of the GNU General Public License as published by the

#   Free Software Foundation; either version 2 of the License, or (at your

#   option) any later version.

#

#   This program is distributed in the hope that it will be useful, but

#   WITHOUT ANY WARRANTY; without even the implied warranty of

#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

#   Public License for more details.

#

#   You should have received a copy of the GNU General Public License along

#   with this program. If not, see <http://www.gnu.org/licenses/>.

#

#   As a special exception, the respective Autoconf Macro's copyright owner

#   gives unlimited permission to copy, distribute and modify the configure

#   scripts that are the output of Autoconf when processing the Macro. You

#   need not follow the terms of the GNU General Public License when using

#   or distributing such scripts, even though portions of the text of the

#   Macro appear in them. The GNU General Public License (GPL) does govern

#   all other use of the material that constitutes the Autoconf Macro.

#

#   This special exception to the GPL applies to versions of the Autoconf

#   Macro released by the Autoconf Archive. When you make and distribute a

#   modified version of the Autoconf Macro, you may extend this special

#   exception to the GPL to apply to your modified version as well.

#serial 13

AC_DEFUN([AX_GCC_OPTION], [

  AC_REQUIRE([AC_PROG_CC])

  AC_MSG_CHECKING([if gcc accepts $1 option])

  AS_IF([ test "x$GCC" = "xyes" ],[

    AS_IF([ test -z "$3" ],[

      ax_gcc_option_test="int main()

{

	return 0;

}"

    ],[

      ax_gcc_option_test="$3"

    ])

    # Dump the test program to file

    cat <<EOF > conftest.c

$ax_gcc_option_test

EOF

    # Dump back the file to the log, useful for debugging purposes

    AC_TRY_COMMAND(cat conftest.c 1>&AS_MESSAGE_LOG_FD)

    AS_IF([ AC_TRY_COMMAND($CC $2 $1 -c conftest.c 1>&AS_MESSAGE_LOG_FD) ],[

		AC_MSG_RESULT([yes])

	$4

    ],[

		AC_MSG_RESULT([no])

	$5

    ])

  ],[

    AC_MSG_RESULT([no gcc available])

  ])

])