cmake: disable warnings in libm + warning about EMMS instruction

SDL_BlitCopyMMX ends with _mm_empty(), so the MMX state should be emptied.

(_mm_empty is the intrinsic function for emms)

CMakeLists.txt

@@ -526,6 +526,17 @@ file(GLOB SOURCE_FILES
   ${SDL2_SOURCE_DIR}/src/video/*.c
   ${SDL2_SOURCE_DIR}/src/video/yuv2rgb/*.c)
 
+if(USE_INTELCC)
+  # warning #39: division by zero
+  # warning #239: floating point underflow
+  # warning #264: floating-point value does not fit in required floating-point type
+  # warning #13203: No EMMS instruction before call to function
+  set_property(SOURCE "${SDL2_SOURCE_DIR}/src/libm/e_exp.c" APPEND_STRING PROPERTY COMPILE_FLAGS " -wd239 -wd264")
+  set_property(SOURCE "${SDL2_SOURCE_DIR}/src/libm/e_log.c" APPEND_STRING PROPERTY COMPILE_FLAGS " -wd39")
+  set_property(SOURCE "${SDL2_SOURCE_DIR}/src/libm/e_log10.c" APPEND_STRING PROPERTY COMPILE_FLAGS " -wd39")
+  set_property(SOURCE "${SDL2_SOURCE_DIR}/src/video/SDL_blit_copy.c" APPEND_STRING PROPERTY COMPILE_FLAGS " -wd13203")
+endif()
+
 
 set(SDL_DEFAULT_ASSERT_LEVEL_CONFIGURED 1)
 if(SDL_ASSERTIONS MATCHES "^(auto|)$")