From a10f6000b0e83c568937593ae81869b2ba83afeb Mon Sep 17 00:00:00 2001
From: peter klausler <pklausler@nvidia.com>
Date: Wed, 10 Oct 2018 14:29:35 -0700
Subject: [PATCH] [flang] Fix issue#202 by avoiding clang+BSD/Darwin header bug

Original-commit: flang-compiler/f18@1bdefe528a8a72483c4a5a3b152db76ffc93e17c
Reviewed-on: https://github.com/flang-compiler/f18/pull/209
Tree-same-pre-rewrite: false
---
 flang/lib/evaluate/integer.h | 4 ++++
 flang/lib/evaluate/real.h    | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/flang/lib/evaluate/integer.h b/flang/lib/evaluate/integer.h
index 3000f8d..2dee579 100644
--- a/flang/lib/evaluate/integer.h
+++ b/flang/lib/evaluate/integer.h
@@ -33,6 +33,10 @@
 #include <string>
 #include <type_traits>
 
+// Some environments, viz. clang on Darwin, allow the macro HUGE
+// to leak out of <math.h> even when it is never directly included.
+#undef HUGE
+
 namespace Fortran::evaluate::value {
 
 // Implements an integer as an assembly of smaller host integer parts
diff --git a/flang/lib/evaluate/real.h b/flang/lib/evaluate/real.h
index b291afe..9034462 100644
--- a/flang/lib/evaluate/real.h
+++ b/flang/lib/evaluate/real.h
@@ -22,6 +22,10 @@
 #include <limits>
 #include <string>
 
+// Some environments, viz. clang on Darwin, allow the macro HUGE
+// to leak out of <math.h> even when it is never directly included.
+#undef HUGE
+
 namespace Fortran::evaluate::value {
 
 // Models IEEE binary floating-point numbers (IEEE 754-2008,
-- 
2.7.4