From 243673c32acee63a7b0b23aeebac9b2ccfd80e7d Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Fri, 24 Aug 2018 04:43:12 -0400
Subject: [PATCH] Add notes on -stdlib=libc++ for MacOS

---
 GNUmakefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/GNUmakefile b/GNUmakefile
index 166354ca..695b9bb2 100755
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -604,10 +604,14 @@ ifeq ($(IS_LINUX),1)
   endif # OpenMP
 endif # IS_LINUX
 
+# libc++ is LLVM's standard C++ library. If we add libc++
+# here then all user programs must use it too. The open
+# question is, which choice is easier on users?
 ifneq ($(IS_DARWIN),0)
+  CXX ?= c++
+  # CXXFLAGS += -stdlib=libc++
   AR = libtool
   ARFLAGS = -static -o
-  CXX ?= c++
 endif
 
 # Add -errtags=yes to get the name for a warning suppression