Merge pull request #3665 from gjasny/fix-asm-for-xcode

Fix Intel Xcode builds with assembly

build/cmake/lib/CMakeLists.txt

@@ -105,7 +105,9 @@ endif ()
 # Our assembly expects to be compiled by a C compiler, and is only enabled for
 # __GNUC__ compatible compilers. Otherwise all the ASM code is disabled by
 # macros.
-set_source_files_properties(${Sources} PROPERTIES LANGUAGE C)
+if(NOT CMAKE_ASM_COMPILER STREQUAL CMAKE_C_COMPILER)
+    set_source_files_properties(${Sources} PROPERTIES LANGUAGE C)
+endif()
 
 macro (add_definition target var)
     if (NOT ("${${var}}" STREQUAL ""))