2010-06-07  Matthias Klose  <doko@ubuntu.com>

	PR bootstrap/43847
	* configure.ac (--enable-plugin): Enhance for cross builds.
	* configure: Regenerate.

Index: gcc/configure.ac
===================================================================
--- gcc/configure.ac	(revision 160359)
+++ gcc/configure.ac	(working copy)
@@ -4551,32 +4551,52 @@
 enable_plugin=yes; default_plugin=yes)
 
 pluginlibs=
-if test x"$enable_plugin" = x"yes"; then
 
-  case "${host}" in
-    *-*-darwin*)
+case "${host}" in
+  *-*-darwin*)
+    if test x$build = x$host; then
+      export_sym_check="nm${exeext} -g"
+    elif x$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${exeext} -T"
+    elif x$host = x$target; then
       export_sym_check="$gcc_cv_objdump -T"
-    ;;
-  esac
+    else
+      export_sym_check=
+    fi
+  ;;
+esac
+
+if test x"$enable_plugin" = x"yes"; then
+
   AC_MSG_CHECKING([for exported symbols])
-  echo "int main() {return 0;} int foobar() {return 0;}" > conftest.c
-  ${CC} ${CFLAGS} ${LDFLAGS} conftest.c -o conftest > /dev/null 2>&1
-  if $export_sym_check conftest | grep foobar > /dev/null; then
-    : # No need to use a flag
-  else
-    AC_MSG_CHECKING([for -rdynamic])
-    ${CC} ${CFLAGS} ${LDFLAGS} -rdynamic conftest.c -o conftest > /dev/null 2>&1
+  if test "x$export_sym_check" != x; then
+    echo "int main() {return 0;} int foobar() {return 0;}" > conftest.c
+    ${CC} ${CFLAGS} ${LDFLAGS} conftest.c -o conftest > /dev/null 2>&1
     if $export_sym_check conftest | grep foobar > /dev/null; then
-      plugin_rdynamic=yes
-      pluginlibs="-rdynamic"
+      : # No need to use a flag
+      AC_MSG_RESULT([yes])
     else
-      plugin_rdynamic=no
-      enable_plugin=no
+      AC_MSG_RESULT([yes])
+      AC_MSG_CHECKING([for -rdynamic])
+      ${CC} ${CFLAGS} ${LDFLAGS} -rdynamic conftest.c -o conftest > /dev/null 2>&1
+      if $export_sym_check conftest | grep foobar > /dev/null; then
+        plugin_rdynamic=yes
+        pluginlibs="-rdynamic"
+      else
+        plugin_rdynamic=no
+        enable_plugin=no
+      fi
+      AC_MSG_RESULT([$plugin_rdynamic])
     fi
-    AC_MSG_RESULT([$plugin_rdynamic])
+  else
+    AC_MSG_RESULT([unable to check])
   fi
 
   # Check -ldl