don't use __thread keyword with g++ < 4 as it results in mysterious problems at link time related to thread-local static wxString::ms_cache
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56928 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
130
build/aclocal/ax_gcc_option.m4
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130
build/aclocal/ax_gcc_option.m4
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# ===========================================================================
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# http://autoconf-archive.cryp.to/ax_gcc_option.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_GCC_OPTION(OPTION,EXTRA-OPTIONS,TEST-PROGRAM,ACTION-IF-SUCCESSFUL,ACTION-IF-NOT-SUCCESFUL)
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#
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# DESCRIPTION
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#
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# AX_GCC_OPTION checks wheter gcc accepts the passed OPTION. If it accepts
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# the OPTION then ACTION-IF-SUCCESSFUL will be executed, otherwise
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# ACTION-IF-UNSUCCESSFUL.
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#
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# NOTE: This macro will be obsoleted by AX_C_CHECK_FLAG AX_CXX_CHECK_FLAG,
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# AX_CPP_CHECK_FLAG, AX_CXXCPP_CHECK_FLAG and AX_LD_CHECK_FLAG.
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#
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# A typical usage should be the following one:
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#
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# AX_GCC_OPTION([-fomit-frame-pointer],[],[],[
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# AC_MSG_NOTICE([The option is supported])],[
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# AC_MSG_NOTICE([No luck this time])
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# ])
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#
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# The macro doesn't discriminate between languages so, if you are testing
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# for an option that works for C++ but not for C you should use '-x c++'
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# as EXTRA-OPTIONS:
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#
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# AX_GCC_OPTION([-fno-rtti],[-x c++],[],[ ... ],[ ... ])
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#
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# OPTION is tested against the following code:
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#
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# int main()
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# {
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# return 0;
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# }
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#
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# The optional TEST-PROGRAM comes handy when the default main() is not
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# suited for the option being checked
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#
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# So, if you need to test for -fstrict-prototypes option you should
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# probably use the macro as follows:
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#
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# AX_GCC_OPTION([-fstrict-prototypes],[-x c++],[
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# int main(int argc, char ** argv)
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# {
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# (void) argc;
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# (void) argv;
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#
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# return 0;
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# }
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# ],[ ... ],[ ... ])
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#
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# Note that the macro compiles but doesn't link the test program so it is
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# not suited for checking options that are passed to the linker, like:
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#
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# -Wl,-L<a-library-path>
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#
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# In order to avoid such kind of problems you should think about usinguse
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# the AX_*_CHECK_FLAG family macros
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#
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# LAST MODIFICATION
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#
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# 2008-04-12
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#
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# COPYLEFT
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#
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# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
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# Copyright (c) 2008 Bogdan Drozdowski <bogdandr@op.pl>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Macro Archive. When you make and
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# distribute a modified version of the Autoconf Macro, you may extend this
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# special exception to the GPL to apply to your modified version as well.
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AC_DEFUN([AX_GCC_OPTION], [
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AC_REQUIRE([AC_PROG_CC])
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AC_MSG_CHECKING([if gcc accepts $1 option])
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AS_IF([ test "x$GCC" = "xyes" ],[
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AS_IF([ test -z "$3" ],[
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ax_gcc_option_test="int main()
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{
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return 0;
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}"
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],[
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ax_gcc_option_test="$3"
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])
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# Dump the test program to file
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cat <<EOF > conftest.c
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$ax_gcc_option_test
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EOF
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# Dump back the file to the log, useful for debugging purposes
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AC_TRY_COMMAND(cat conftest.c 1>&AS_MESSAGE_LOG_FD)
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AS_IF([ AC_TRY_COMMAND($CC $2 $1 -c conftest.c 1>&AS_MESSAGE_LOG_FD) ],[
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AC_MSG_RESULT([yes])
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$4
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],[
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AC_MSG_RESULT([no])
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$5
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])
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],[
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AC_MSG_RESULT([no gcc available])
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])
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])
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