From 2d382487e63c742becdc1adb37b12818976926b8 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 5 Aug 2021 11:59:09 +0200
Subject: Avoid normalizing likely already normalized directories in
 search_existing()

---
 libbuild2/algorithm.cxx | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/libbuild2/algorithm.cxx b/libbuild2/algorithm.cxx
index 54ddf78..52e0926 100644
--- a/libbuild2/algorithm.cxx
+++ b/libbuild2/algorithm.cxx
@@ -132,7 +132,14 @@ namespace build2
       return nullptr;
 
     if (!n.dir.empty ())
-      n.dir.normalize (false, true); // Current dir collapses to an empty one.
+    {
+      // More often than not a non-empty directory will already be normalized.
+      //
+      // Note that we collapse current dir to an empty one.
+      //
+      if (!n.dir.normalized () || n.dir.string () == ".")
+        n.dir.normalize (false, true);
+    }
 
     bool q (cn.qualified ());
 
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