From: Bruno Cardoso Lopes <bruno.cardoso@gmail.com>
Date: Tue, 1 Aug 2017 22:10:36 +0000 (+0000)
Subject: [Headers][Darwin] Allow #include_next<float.h> to work on Darwin prior to 10.7
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=af1df2901bedeb6092c08745d00bfdb0e3a247af;p=clang

[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

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@309752 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Headers/float.h b/lib/Headers/float.h
index 0f453d87cb..502143d4e4 100644
--- a/lib/Headers/float.h
+++ b/lib/Headers/float.h
@@ -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. */