From 21909f5affa108c6d565d3e1222a2e2039cb70fd Mon Sep 17 00:00:00 2001
From: peter <petrel.harp@gmail.com>
Date: Fri, 7 Aug 2020 08:30:36 -0700
Subject: [PATCH] omit math.h under cpp

---
 c/tskit/core.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/c/tskit/core.h b/c/tskit/core.h
index bf586ba2b6..3ffd2c87c9 100644
--- a/c/tskit/core.h
+++ b/c/tskit/core.h
@@ -39,8 +39,9 @@ extern "C" {
 #include <stdint.h>
 #include <limits.h>
 
-#ifdef __clang__
+#if defined(__clang__) && !defined(__cplusplus)
 /* Work around bug in clang >= 6.0, https://github.com/tskit-dev/tskit/issues/721
+ * (note: fixed in clang January 2019)
  */
 #if __has_builtin(__builtin_isnan)
 #undef isnan