--- a/make/bsd/makefiles/gcc.make	Tue Mar 11 15:34:06 2014 +0100
+++ b/make/bsd/makefiles/gcc.make	Wed Mar 12 13:30:08 2014 +0100
@@ -261,14 +261,13 @@
   WARNINGS_ARE_ERRORS += -Wno-empty-body
 endif
 
-WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef
+WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wformat=2 -Wno-error=format-nonliteral
 
-ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
+ifeq ($(USE_CLANG),)
   # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
   # conversions which might affect the values. Only enable it in earlier versions.
-  WARNING_FLAGS = -Wunused-function
-  ifeq ($(USE_CLANG),)
-    WARNING_FLAGS += -Wconversion
+  ifeq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
+    WARNINGS_FLAGS += -Wconversion
   endif
 endif
 
@@ -291,7 +290,7 @@
 # The flags to use for an Optimized g++ build
 ifeq ($(OS_VENDOR), Darwin)
   # use -Os by default, unless -O3 can be proved to be worth the cost, as per policy
-  # <http://wikis.sun.com/display/OpenJDK/Mac+OS+X+Port+Compilers>
+  # <https://wiki.openjdk.java.net/display/MacOSXPort/Compiler+Errata>
   OPT_CFLAGS_DEFAULT ?= SIZE
 else
   OPT_CFLAGS_DEFAULT ?= SPEED
@@ -386,6 +385,11 @@
 # statically link libstdc++.so, work with gcc but ignored by g++
 STATIC_STDCXX = -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic
 
+# Ensure use libstdc++ on clang, not libc++
+ifeq ($(USE_CLANG), true)
+  LFLAGS += -stdlib=libstdc++
+endif
+
 ifeq ($(USE_CLANG),)
   # statically link libgcc and/or libgcc_s, libgcc does not exist before gcc-3.x.
   ifneq ("${CC_VER_MAJOR}", "2")