Bug 528263: Use -Wno-variadic-macros argument for g++, to hide useless compiler warning. r=graydon r=bsmedberg

configure.in

@@ -1512,6 +1512,24 @@ if test "$GNU_CXX"; then
         _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} ${_COMPILER_PREFIX}-Wno-invalid-offsetof"
     fi
 
+    AC_CACHE_CHECK(whether the compiler supports -Wno-variadic-macros,
+                   ac_has_wno_variadic_macros,
+        [
+            AC_LANG_SAVE
+            AC_LANG_CPLUSPLUS
+            _SAVE_CXXFLAGS="$CXXFLAGS"
+            CXXFLAGS="$CXXFLAGS ${_COMPILER_PREFIX}-Wno-variadic-macros"
+            AC_TRY_COMPILE([],
+                           [return(0);],
+                           ac_has_wno_variadic_macros="yes",
+                           ac_has_wno_variadic_macros="no")
+            CXXFLAGS="$_SAVE_CXXFLAGS"
+            AC_LANG_RESTORE
+        ])
+    if test "$ac_has_wno_variadic_macros" = "yes"; then
+        _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} ${_COMPILER_PREFIX}-Wno-variadic-macros"
+    fi
+
     AC_CACHE_CHECK(whether the compiler supports -Werror=overloaded-virtual,
                    ac_has_werror_overloaded_virtual,
         [
@@ -1533,8 +1551,6 @@ if test "$GNU_CXX"; then
         _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Woverloaded-virtual"
     fi
 
- 
-
 else
     _DEFINES_CXXFLAGS='-DMOZILLA_CLIENT -D_MOZILLA_CONFIG_H_ $(ACDEFINES)'
 fi