r309752 - [Headers][Darwin] Allow #include_next<float.h> to work on Darwin prior to 10.7

[Bruno Cardoso Lopes via cfe-commits]

Author: bruno
Date: Tue Aug  1 15:10:36 2017
New Revision: 309752

URL: http://llvm.org/viewvc/llvm-project?rev=309752&view=rev
Log:
[Headers][Darwin] Allow #include_next<float.h> to work on Darwin prior to 10.7

This fixes PR31504 and it's a follow up from adding #include_next<float.h>
for Darwin in r289018.

rdar://problem/29856682

Modified:
    cfe/trunk/lib/Headers/float.h

Modified: cfe/trunk/lib/Headers/float.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Headers/float.h?rev=309752&r1=309751&r2=309752&view=diff
==============================================================================
--- cfe/trunk/lib/Headers/float.h (original)
+++ cfe/trunk/lib/Headers/float.h Tue Aug  1 15:10:36 2017
@@ -33,6 +33,15 @@
  */
 #if (defined(__APPLE__) || (defined(__MINGW32__) || defined(_MSC_VER))) && \
     __STDC_HOSTED__ && __has_include_next(<float.h>)
+
+/* Prior to Apple's 10.7 SDK, float.h SDK header used to apply an extra level
+ * of #include_next<float.h> to keep Metrowerks compilers happy. Avoid this
+ * extra indirection.
+ */
+#ifdef __APPLE__
+#define _FLOAT_H_
+#endif
+
 #  include_next <float.h>
 
 /* Undefine anything that we'll be redefining below. */