Merge pull request open-source-parsers#29 from mloy/type-punned-pointer

Type punned pointer

I'll revert this if anyone reports a problem. *strict-aliasing* is not my favorite compiler warning.

Author: cdunn2001

src/lib_json/CMakeLists.txt

@@ -7,6 +7,10 @@ ELSE(JSONCPP_LIB_BUILD_SHARED)
 ENDIF(JSONCPP_LIB_BUILD_SHARED)
 
 
+if( CMAKE_COMPILER_IS_GNUCXX )
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=strict-aliasing")
+endif( CMAKE_COMPILER_IS_GNUCXX )
+
 SET( JSONCPP_INCLUDE_DIR ../../include )
 
 SET( PUBLIC_HEADERS

src/lib_json/json_value.cpp

@@ -34,7 +34,8 @@ namespace Json {
 #define ALIGNAS(byte_alignment)
 #endif
 static const unsigned char ALIGNAS(8) kNull[sizeof(Value)] = {0};
-const Value& Value::null = reinterpret_cast<const Value&>(kNull);
+const unsigned char& kNullRef = kNull[0];
+const Value& Value::null = reinterpret_cast<const Value&>(kNullRef);
 
 const Int Value::minInt = Int(~(UInt(-1) / 2));
 const Int Value::maxInt = Int(UInt(-1) / 2);