bug 877937 - make js embedders build as c++11 when we do r=ted f=waldo

js/src/Makefile.in

@@ -517,7 +517,8 @@ JS_CONFIG_SUBSTITUTIONS=\
 	-DMOZJS_PATCH_VERSION="$(MOZJS_PATCH_VERSION)" \
 	-DMOZJS_ALPHA="$(MOZJS_ALPHA)" \
 	-DNSPR_CFLAGS="$(NSPR_CFLAGS)" \
-	-DNSPR_PKGCONF_CHECK="$(NSPR_PKGCONF_CHECK)"
+	-DNSPR_PKGCONF_CHECK="$(NSPR_PKGCONF_CHECK)" \
+	-DUSE_CXX11="$(USE_CXX11)"
 
 $(JS_CONFIG_NAME): js-config.in Makefile $(DEPTH)/config/autoconf.mk $(topsrcdir)/config/config.mk $(topsrcdir)/config/rules.mk
 	$(RM) $@.tmp

js/src/configure.in

@@ -2338,6 +2338,7 @@ AC_LANG_CPLUSPLUS
 if test "$GNU_CXX"; then
     _SAVE_CXXFLAGS=$CXXFLAGS
     CXXFLAGS="$CXXFLAGS -std=gnu++0x"
+    USE_CXX11=1
 
     AC_CACHE_CHECK(for gcc c++0x headers bug without rtti,
         ac_cv_cxx0x_headers_bug,
@@ -2355,9 +2356,11 @@ if test "$GNU_CXX"; then
 
         if test "ac_cv_cxx0x_clang_workaround" = "no"; then
             CXXFLAGS="$_SAVE_CXXFLAGS"
+            USE_CXX11=
         fi
     elif test "$ac_cv_cxx0x_headers_bug" = "yes"; then
         CXXFLAGS="$_SAVE_CXXFLAGS"
+            USE_CXX11=
     fi
 fi
 
@@ -4331,6 +4334,7 @@ AC_SUBST(OS_TEST)
 AC_SUBST(CPU_ARCH)
 AC_SUBST(INTEL_ARCHITECTURE)
 
+AC_SUBST(USE_CXX11)
 AC_SUBST(WRAP_LDFLAGS)
 AC_SUBST(MKSHLIB)
 AC_SUBST(MKCSHLIB)

js/src/js-config.in

@@ -109,7 +109,11 @@ if test "$echo_libdir" = "yes"; then
 fi
 
 if test "$echo_cflags" = "yes"; then
-    echo "-include $includedir/$LIBRARY_NAME/js/RequiredDefines.h -I$includedir/$LIBRARY_NAME $NSPR_CFLAGS"
+    cflags="-include $includedir/$LIBRARY_NAME/js/RequiredDefines.h -I$includedir/$LIBRARY_NAME $NSPR_CFLAGS"
+    if test '@USE_CXX11@' = "1"; then
+        cflags="$cflags -std=gnu++0x"
+    fi
+    echo $cflags
 fi
 
 if test "$echo_libs" = "yes"; then