Add deprecation macro.

spirv_common.hpp

@@ -55,6 +55,16 @@ public:
 #define SPIRV_CROSS_THROW(x) throw CompilerError(x)
 #endif
 
+#if __cplusplus >= 201402l
+#define SPIRV_CROSS_DEPRECATED(reason) [[deprecated(reason)]]
+#elif defined(__GNUC__)
+#define SPIRV_CROSS_DEPRECATED(reason) __attribute__((deprecated))
+#elif defined(_MSC_VER)
+#define SPIRV_CROSS_DEPRECATED(reason) __declspec(deprecated(reason))
+#else
+#define SPIRV_CROSS_DEPRECATED(reason)
+#endif
+
 namespace inner
 {
 template <typename T>

spirv_cross.hpp

@@ -204,7 +204,7 @@ public:
 	virtual size_t get_declared_struct_member_size(const SPIRType &struct_type, uint32_t index) const;
 
 	// Legacy GLSL compatibility method. Deprecated in favor of CompilerGLSL::flatten_buffer_block
-	void flatten_interface_block(uint32_t id);
+	SPIRV_CROSS_DEPRECATED("Please use flatten_buffer_block instead.") void flatten_interface_block(uint32_t id);
 
 	// Returns a set of all global variables which are statically accessed
 	// by the control flow graph from the current entry point.