From: Douglas Gregor <dgregor@apple.com>
Date: Tue, 5 Jul 2011 14:17:04 +0000 (+0000)
Subject: Teach Clang's <float.h> to also include MinGW's <float.h>, which provides additional... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5254c2638d6822fe3e884d45eab7d00929bd451d;p=clang

Teach Clang's <float.h> to also include MinGW's <float.h>, which provides additional system definitions, from Ruben Van Boxem

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134407 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Headers/float.h b/lib/Headers/float.h
index 28fb882bd2..6eede0b6ba 100644
--- a/lib/Headers/float.h
+++ b/lib/Headers/float.h
@@ -24,6 +24,48 @@
 #ifndef __FLOAT_H
 #define __FLOAT_H
 
+/* If we're on MinGW, fall baack to the system's float.h, which might have
+ * additional definitions provided for Windows.
+ * For more details see http://msdn.microsoft.com/en-us/library/y0ybw9fy.aspx
+ */
+#if defined(__MINGW32__) && \
+    defined(__has_include_next) && __has_include_next(<float.h>)
+#  include_next <float.h>
+
+/* Undefine anything that we'll be redefining below. */
+#  undef FLT_EVAL_METHOD
+#  undef FLT_ROUNDS
+#  undef FLT_RADIX
+#  undef FLT_MANT_DIG
+#  undef DBL_MANT_DIG
+#  undef LDBL_MANT_DIG
+#  undef DECIMAL_DIG
+#  undef FLT_DIG
+#  undef DBL_DIG
+#  undef LDBL_DIG
+#  undef FLT_MIN_EXP
+#  undef DBL_MIN_EXP
+#  undef LDBL_MIN_EXP
+#  undef FLT_MIN_10_EXP
+#  undef DBL_MIN_10_EXP
+#  undef LDBL_MIN_10_EXP
+#  undef FLT_MAX_EXP
+#  undef DBL_MAX_EXP
+#  undef LDBL_MAX_EXP
+#  undef FLT_MAX_10_EXP
+#  undef DBL_MAX_10_EXP
+#  undef LDBL_MAX_10_EXP
+#  undef FLT_MAX
+#  undef DBL_MAX
+#  undef LDBL_MAX
+#  undef FLT_EPSILON
+#  undef DBL_EPSILON
+#  undef LDBL_EPSILON
+#  undef FLT_MIN
+#  undef DBL_MIN
+#  undef LDBL_MIN
+#endif
+
 /* Characteristics of floating point types, C99 5.2.4.2.2 */
 
 #define FLT_EVAL_METHOD __FLT_EVAL_METHOD__