Check compiler architecture flags in one place

src/crc32.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Intel Corporation
+ * Copyright (c) 2015-2017, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -29,6 +29,7 @@
 #include "crc32.h"
 #include "config.h"
 #include "ue2common.h"
+#include "util/arch.h"
 
 #if defined(HAVE_C_X86INTRIN_H)
 #include <x86intrin.h>
@@ -36,7 +37,7 @@
 #include <intrin.h>
 #endif
 
-#ifndef __SSE4_2__
+#if !defined(HAVE_SSE42)
 
 /***
  *** What follows is derived from Intel's Slicing-by-8 CRC32 impl, which is BSD
@@ -582,7 +583,7 @@ u32 crc32c_sb8_64_bit(u32 running_crc, const unsigned char* p_buf,
     return crc;
 }
 
-#else // __SSE4_2__
+#else // HAVE_SSE42
 
 #ifdef ARCH_64_BIT
 #define CRC_WORD 8
@@ -638,7 +639,7 @@ u32 crc32c_sse42(u32 running_crc, const unsigned char* p_buf,
 
 // Externally visible function
 u32 Crc32c_ComputeBuf(u32 inCrc32, const void *buf, size_t bufLen) {
-#ifdef __SSE4_2__
+#if defined(HAVE_SSE42)
     u32 crc = crc32c_sse42(inCrc32, (const unsigned char *)buf, bufLen);
 #else
     u32 crc = crc32c_sb8_64_bit(inCrc32, (const unsigned char *)buf, bufLen);