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Diffstat (limited to 'mpc/m4/ax_gcc_option.m4')
| -rw-r--r-- | mpc/m4/ax_gcc_option.m4 | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/mpc/m4/ax_gcc_option.m4 b/mpc/m4/ax_gcc_option.m4 new file mode 100644 index 0000000000..f8c7cd1310 --- /dev/null +++ b/mpc/m4/ax_gcc_option.m4 @@ -0,0 +1,130 @@ +# =========================================================================== +# 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]) + ]) +]) |