+# ===========================================================================
+# http://autoconf-archive.cryp.to/ax_gcc_option.html
+# ===========================================================================
+#
+# 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.
+#
+# NOTE: This macro will be obsoleted by AX_C_CHECK_FLAG AX_CXX_CHECK_FLAG,
+# AX_CPP_CHECK_FLAG, AX_CXXCPP_CHECK_FLAG and AX_LD_CHECK_FLAG.
+#
+# 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
+#
+# LAST MODIFICATION
+#
+# 2008-04-12
+#
+# COPYLEFT
+#
+# 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 Macro 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.
+
+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])
+ ])
+])
projects / wxWidgets.git / commitdiff
