Headers: conditionalise more declarations

Protect MMX specific declarations under a __MMX__ guard.  This header can be
included on non-x86 architectures (e.g. ARM) which do not support the MMX ISA.
Use the preprocessor to prevent these declarations from being processed.

llvm-svn: 212512

clang/lib/Headers/Intrin.h

@@ -41,12 +41,14 @@
 extern "C" {
 #endif
 
+#if defined(__MMX__)
 /* And the random ones that aren't in those files. */
 __m64 _m_from_float(float);
 __m64 _m_from_int(int _l);
 void _m_prefetch(void *);
 float _m_to_float(__m64);
 int _m_to_int(__m64 _M);
+#endif
 
 /* Other assorted instruction intrinsics. */
 void __addfsbyte(unsigned long, unsigned char);

clang/test/Headers/arm-intrin.c

@@ -0,0 +1,6 @@
+// RUN: %clang -target armv7-windows -I %S/Inputs/include -Xclang -verify -E %s
+// expected-no-diagnostics
+
+typedef __SIZE_TYPE__ size_t;
+#include <Intrin.h>
+