From a2b82076701a7b568eb1a55c9618038922c66f48 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 18 Jul 2020 12:07:42 +0200
Subject: Work around Clang bug #45021

---
 libbuild2/buildfile | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libbuild2/buildfile b/libbuild2/buildfile
index ce5a090..831a9b9 100644
--- a/libbuild2/buildfile
+++ b/libbuild2/buildfile
@@ -172,6 +172,16 @@ if ($cxx.target.class != 'windows')
   if ($cxx.target.class != "bsd")
     libus{build2}: cxx.libs += -ldl
 }
+else
+{
+  # @@ TMP work around Clang bug #45021.
+  #
+  if ($cxx.id == 'clang' && $cxx.target.system == 'win32-msvc')
+  {
+    if ($regex.find_match($cc.coptions $cxx.coptions, '-O[23]'))
+      script/obj{run}: cxx.coptions += -O1
+  }
+}
 
 # Export options.
 #
-- 
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