From fda4ec23a9c6142f050d49040f81a0096ce4cdfd Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 10 Jul 2018 15:25:54 +0200
Subject: Fix bug in dist checksum implementation

---
 build2/dist/operation.cxx | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/build2/dist/operation.cxx b/build2/dist/operation.cxx
index 8a22299..b1b1e6c 100644
--- a/build2/dist/operation.cxx
+++ b/build2/dist/operation.cxx
@@ -467,10 +467,13 @@ namespace build2
           auto ap (split (p, dist_root, "dist.archives"));
           path a (archive (dist_root, dist_package, ap.first, ap.second));
 
-          for (const path& p: cast<paths> (cs))
+          if (cs)
           {
-            auto cp (split (p, ap.first, "dist.checksums"));
-            checksum (a, cp.first, cp.second);
+            for (const path& p: cast<paths> (cs))
+            {
+              auto cp (split (p, ap.first, "dist.checksums"));
+              checksum (a, cp.first, cp.second);
+            }
           }
         }
       }
-- 
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