From c6a039d087ca2b333d1d3a2604d675e0010f7063 Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Sun, 20 Jan 2019 22:40:31 +0100
Subject: build: Fix -Wconversion warnings for fpclassify et al

closes #8274

- Instead of #undef and re-#define, define "xfoo" wrappers to avoid
  include-order sensitivity.
- The warnings are bogus, caused by bad interaction between glibc and
  clang 6+.
  - https://bugs.llvm.org/show_bug.cgi?id=35268
  - https://bugs.llvm.org/show_bug.cgi?id=39738
  - https://bugzilla.redhat.com/show_bug.cgi?id=1472437
---
 src/nvim/macros.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'src/nvim/macros.h')

diff --git a/src/nvim/macros.h b/src/nvim/macros.h
index d447bff765..1d47520d8a 100644
--- a/src/nvim/macros.h
+++ b/src/nvim/macros.h
@@ -1,6 +1,10 @@
 #ifndef NVIM_MACROS_H
 #define NVIM_MACROS_H
 
+#include <math.h>
+
+#include "auto/config.h"
+
 // EXTERN is only defined in main.c. That's where global variables are
 // actually defined and initialized.
 #ifndef EXTERN
@@ -19,6 +23,23 @@
 # define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
 #endif
 
+#if defined(__clang__) && __clang__ == 1 && __clang_major__ >= 6 \
+    && defined(HAVE___FPCLASSIFY)
+// Workaround glibc + Clang 6+ bug. #8274
+// https://bugzilla.redhat.com/show_bug.cgi?id=1472437
+# define xfpclassify __fpclassify
+# define xisnan __isnan
+# define xisinf __isinf
+#elif defined(__MINGW32__)
+// Workaround mingw warning. #7863
+# define xfpclassify __fpclassify
+# define xisnan _isnan
+#else
+# define xfpclassify fpclassify
+# define xisnan isnan
+# define xisinf isinf
+#endif
+
 /// String with length
 ///
 /// For use in functions which accept (char *s, size_t len) pair in arguments.
-- 
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