Merge pull request #568 from KhronosGroup/fix-567

Fix GCC 8.1 build.

build_glslang_spirv_tools.sh

@@ -20,7 +20,7 @@ cd ../..
 echo "Building SPIRV-Tools."
 mkdir -p external/spirv-tools-build
 cd external/spirv-tools-build
-cmake ../spirv-tools -DCMAKE_BUILD_TYPE=$PROFILE -G"Unix Makefiles"
+cmake ../spirv-tools -DCMAKE_BUILD_TYPE=$PROFILE -G"Unix Makefiles" -DSPIRV_WERROR=OFF
 make -j$NPROC
 cd ../..
 

spirv_common.hpp

@@ -867,6 +867,7 @@ struct SPIRConstant : IVariant
 		// Workaround for MSVC 2013, initializing an array breaks.
 		ConstantVector()
 		{
+			memset(r, 0, sizeof(r));
 			for (unsigned i = 0; i < 4; i++)
 				id[i] = 0;
 		}
@@ -1005,7 +1006,7 @@ struct SPIRConstant : IVariant
 
 	inline void make_null(const SPIRType &constant_type_)
 	{
-		std::memset(&m, 0, sizeof(m));
+		m = {};
 		m.columns = constant_type_.columns;
 		for (auto &c : m.c)
 			c.vecsize = constant_type_.vecsize;