Complement compilation options according to gcc version

Makefile

@@ -14,7 +14,17 @@ LIBPATHS = $(addprefix -L, $(LIBS))
 SRCEXTS = .c .cc .cpp .proto
 HDREXTS = .h .hpp
 
-ifeq ($(shell test $(shell $(CXX) -dumpversion | sed -e 's/\..*$$//g') -ge 7; echo $$?),0)
+# strict-aliasing in gcc4.4 in buggy
+ifeq ($(shell echo $$(($(GCC_VERSION)/ 100))), 404)
+	CXXFLAGS+=-Wno-strict-aliasing
+	CFLAGS+=-Wno-strict-aliasing
+endif
+#required by base/crc32.cc to boost performance for 10x
+ifeq ($(shell test $(GCC_VERSION) -ge 40400; echo $$?),0)
+	CXXFLAGS+=-msse4 -msse4.2
+endif
+#not solved yet
+ifeq ($(shell test $(GCC_VERSION) -ge 70000; echo $$?),0)
 	CXXFLAGS+=-Wno-aligned-new
 endif
 

config_brpc.sh

@@ -26,6 +26,8 @@ while true; do
     esac
 done
 
+GCC_VERSION=$($CXX tools/print_gcc_version.cc -o print_gcc_version && ./print_gcc_version && rm ./print_gcc_version)
+
 if [ -z "$HDRS_IN" ] || [ -z "$LIBS_IN" ]; then
     >&2 $ECHO "config_brpc: --headers=HDRPATHS --libs=LIBPATHS must be specified"
     exit 1
@@ -163,6 +165,7 @@ append_to_output "PROTOC=$PROTOC"
 append_to_output "PROTOBUF_HDR=$PROTOBUF_HDR"
 append_to_output "CC=$CC"
 append_to_output "CXX=$CXX"
+append_to_output "GCC_VERSION=$GCC_VERSION"
 append_to_output "STATIC_LINKINGS=$STATIC_LINKINGS"
 append_to_output "DYNAMIC_LINKINGS=$DYNAMIC_LINKINGS"
 

tools/print_gcc_version.cc

+#include <stdio.h>
+int main() {
+#if defined(__GNUC__)
+    printf("%d\n", (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__));
+#else
+    printf("0\n");
+#endif
+    return 0;
+}