fix clang build on windows

Author: brakhane

WickedEngine/CMakeLists.txt

@@ -69,9 +69,6 @@ add_library(${TARGET_NAME} ${WICKED_LIBRARY_TYPE}
 	${HEADER_FILES}
 )
 
-if(MSVC)
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP /bigobj")
-endif()
 
 add_library(WickedEngine ALIAS ${TARGET_NAME})
 set_target_properties(${TARGET_NAME} PROPERTIES
@@ -95,7 +92,13 @@ if (WIN32)
 		UNICODE _UNICODE
 	)
 
-	target_compile_options(${TARGET_NAME} PRIVATE /W3)
+	if (MSVC)
+		target_compile_options(${TARGET_NAME} PRIVATE
+			/W3
+			/MP
+			/bigobj
+		)
+	endif()
 
 	set(LIBDXCOMPILER "dxcompiler.dll")
 else ()

WickedEngine/Utility/minimp4.h

@@ -494,7 +494,7 @@ int MP4E_set_text_comment(MP4E_mux_t *mux, const char *comment);
 #define MINIMP4_IMPLEMENTATION_GUARD
 
 #define FOUR_CHAR_INT(a, b, c, d) (((uint32_t)(a) << 24) | ((b) << 16) | ((c) << 8) | (d))
-enum
+enum : uint32_t
 {
     BOX_co64    = FOUR_CHAR_INT( 'c', 'o', '6', '4' ),//ChunkLargeOffsetAtomType
     BOX_stco    = FOUR_CHAR_INT( 's', 't', 'c', 'o' ),//ChunkOffsetAtomType