From 9c02d307d69faa6e3c7056d8e07f16c75c189f92 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 25 Mar 2015 15:14:06 +0200
Subject: Recognize common cases (., .., and dir{}) when deriving out_base

---
 build/b.cxx | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

(limited to 'build')

diff --git a/build/b.cxx b/build/b.cxx
index 3a37b68..0443b4b 100644
--- a/build/b.cxx
+++ b/build/b.cxx
@@ -318,14 +318,25 @@ main (int argc, char* argv[])
           path out_base (tn.dir);
           if (out_base.empty ())
           {
-            // See if there is a directory part in value. We cannot
-            // assume it is a valid filesystem name so we will have
-            // to do the splitting manually.
+            const string& v (tn.value);
+
+            // Handle a few common cases as special: empty name, '.',
+            // '..', as well as dir{foo/bar} (without trailing '/').
+            // This code must be consistent with target_type_map::find().
             //
-            path::size_type i (path::traits::rfind_separator (tn.value));
+            if (v.empty () || v == "." || v == ".." || tn.type == "dir")
+              out_base = path (v);
+            else
+            {
+              // See if there is a directory part in value. We cannot
+              // assume it is a valid filesystem name so we will have
+              // to do the splitting manually.
+              //
+              path::size_type i (path::traits::rfind_separator (v));
 
-            if (i != string::npos)
-              out_base = path (tn.value, i != 0 ? i : 1); // Special case: "/".
+              if (i != string::npos)
+                out_base = path (v, i != 0 ? i : 1); // Special case: "/".
+            }
           }
 
           if (out_base.relative ())
-- 
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