113 lines
3.4 KiB
Text
113 lines
3.4 KiB
Text
# gcc-plugin.m4 -*- Autoconf -*-
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# Check whether GCC is able to be built with plugin support.
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dnl Copyright (C) 2014 Free Software Foundation, Inc.
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dnl This file is free software, distributed under the terms of the GNU
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dnl General Public License. As a special exception to the GNU General
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dnl Public License, this file may be distributed as part of a program
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dnl that contains a configuration script generated by Autoconf, under
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dnl the same distribution terms as the rest of that program.
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# Check for plugin support.
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# Respects --enable-plugin.
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# Sets the shell variables enable_plugin and pluginlibs.
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AC_DEFUN([GCC_ENABLE_PLUGINS],
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[# Check for plugin support
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AC_ARG_ENABLE(plugin,
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[AS_HELP_STRING([--enable-plugin], [enable plugin support])],
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enable_plugin=$enableval,
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enable_plugin=yes; default_plugin=yes)
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pluginlibs=
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case "${host}" in
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*-*-darwin*)
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if test x$build = x$host; then
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export_sym_check="nm${exeext} -g"
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elif test x$host = x$target; then
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export_sym_check="$gcc_cv_nm -g"
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else
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export_sym_check=
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fi
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;;
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*)
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if test x$build = x$host; then
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export_sym_check="objdump${exeext} -T"
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elif test x$host = x$target; then
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export_sym_check="$gcc_cv_objdump -T"
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else
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export_sym_check=
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fi
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;;
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esac
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if test x"$enable_plugin" = x"yes"; then
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AC_MSG_CHECKING([for exported symbols])
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if test "x$export_sym_check" != x; then
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echo "int main() {return 0;} int foobar() {return 0;}" > conftest.c
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${CC} ${CFLAGS} ${LDFLAGS} conftest.c -o conftest$ac_exeext > /dev/null 2>&1
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if $export_sym_check conftest$ac_exeext | grep -q foobar > /dev/null; then
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: # No need to use a flag
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AC_MSG_RESULT([yes])
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else
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AC_MSG_RESULT([yes])
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AC_MSG_CHECKING([for -rdynamic])
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${CC} ${CFLAGS} ${LDFLAGS} -rdynamic conftest.c -o conftest$ac_exeext > /dev/null 2>&1
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if $export_sym_check conftest$ac_exeext | grep -q foobar > /dev/null; then
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plugin_rdynamic=yes
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pluginlibs="-rdynamic"
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else
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plugin_rdynamic=no
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enable_plugin=no
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fi
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AC_MSG_RESULT([$plugin_rdynamic])
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fi
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else
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AC_MSG_RESULT([unable to check])
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fi
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# Check -ldl
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saved_LIBS="$LIBS"
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AC_SEARCH_LIBS([dlopen], [dl])
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if test x"$ac_cv_search_dlopen" = x"-ldl"; then
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pluginlibs="$pluginlibs -ldl"
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fi
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LIBS="$saved_LIBS"
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# Check that we can build shared objects with -fPIC -shared
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saved_LDFLAGS="$LDFLAGS"
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saved_CFLAGS="$CFLAGS"
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case "${host}" in
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*-*-darwin*)
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CFLAGS=`echo $CFLAGS | sed s/-mdynamic-no-pic//g`
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CFLAGS="$CFLAGS -fPIC"
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LDFLAGS="$LDFLAGS -shared -undefined dynamic_lookup"
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;;
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*)
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CFLAGS="$CFLAGS -fPIC"
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LDFLAGS="$LDFLAGS -fPIC -shared"
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;;
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esac
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AC_MSG_CHECKING([for -fPIC -shared])
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AC_TRY_LINK(
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[extern int X;],[return X == 0;],
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[AC_MSG_RESULT([yes]); have_pic_shared=yes],
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[AC_MSG_RESULT([no]); have_pic_shared=no])
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if test x"$have_pic_shared" != x"yes" -o x"$ac_cv_search_dlopen" = x"no"; then
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pluginlibs=
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enable_plugin=no
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fi
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LDFLAGS="$saved_LDFLAGS"
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CFLAGS="$saved_CFLAGS"
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# If plugin support had been requested but not available, fail.
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if test x"$enable_plugin" = x"no" ; then
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if test x"$default_plugin" != x"yes"; then
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AC_MSG_ERROR([
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Building GCC with plugin support requires a host that supports
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-fPIC, -shared, -ldl and -rdynamic.])
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fi
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fi
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fi
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])
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