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