other: adjust compiler flag for clang.

cmake/cmake.define

@@ -124,26 +124,32 @@ ELSE ()
     ENDIF ()
 
     INCLUDE(CheckCCompilerFlag)
-    CHECK_C_COMPILER_FLAG("-msse4.2" GCC_SUPPORT_SSE42)
-    CHECK_C_COMPILER_FLAG("-mfma" GCC_SUPPORT_FMA)
-    CHECK_C_COMPILER_FLAG("-mavx" GCC_SUPPORT_AVX)
-    CHECK_C_COMPILER_FLAG("-mavx2" GCC_SUPPORT_AVX2)
+    IF ("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
+        SET(COMPILER_SUPPORT_SSE42 true)
+        MESSAGE(STATUS "Always enable sse4.2 for Clang")
+    ELSE()
+        CHECK_C_COMPILER_FLAG("-msse4.2" COMPILER_SUPPORT_SSE42)
+    ENDIF()
+
+    CHECK_C_COMPILER_FLAG("-mfma" COMPILER_SUPPORT_FMA)
+    CHECK_C_COMPILER_FLAG("-mavx" COMPILER_SUPPORT_AVX)
+    CHECK_C_COMPILER_FLAG("-mavx2" COMPILER_SUPPORT_AVX2)
 
-    IF (GCC_SUPPORT_SSE42)
+    IF (COMPILER_SUPPORT_SSE42)
         SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse4.2")
         SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.2")
     ENDIF()
-    IF (GCC_SUPPORT_FMA)
+    IF (COMPILER_SUPPORT_FMA)
         SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfma")
         SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfma")
     ENDIF()
 
     IF ("${SIMD_SUPPORT}" MATCHES "true")
-        IF (GCC_SUPPORT_AVX)
+        IF (COMPILER_SUPPORT_AVX)
             SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mavx")
             SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx")
         ENDIF()
-        IF (GCC_SUPPORT_AVX2)
+        IF (COMPILER_SUPPORT_AVX2)
             SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mavx2")
             SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx2")
         ENDIF()

cmake/cmake.platform

@@ -147,7 +147,7 @@ ELSE ()
   ENDIF ()
 ENDIF ()
 
-MESSAGE(STATUS "platform arch:" ${PLATFORM_ARCH_STR})
+MESSAGE(STATUS "Platform arch:" ${PLATFORM_ARCH_STR})
 
 MESSAGE("C Compiler: ${CMAKE_C_COMPILER} (${CMAKE_C_COMPILER_ID}, ${CMAKE_C_COMPILER_VERSION})")
 MESSAGE("CXX Compiler: ${CMAKE_CXX_COMPILER} (${CMAKE_C_COMPILER_ID}, ${CMAKE_CXX_COMPILER_VERSION})")