From f56b5a42b9aaaeb0c4e7dee894dea9686599b88c Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 24 Jun 2015 17:26:17 +0200
Subject: Implement proper target type detection in dependency injection

---
 build/diagnostics.cxx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'build/diagnostics.cxx')

diff --git a/build/diagnostics.cxx b/build/diagnostics.cxx
index d820145..f6d81bf 100644
--- a/build/diagnostics.cxx
+++ b/build/diagnostics.cxx
@@ -162,7 +162,10 @@ namespace build
     diag_record r (text);
 
     for (const char* const* p (args); *p != nullptr; p++)
-      r << (p != args ? " " : "") << *p;
+      r << (p != args ? " " : "")
+        << (**p == '\0' ? "\"" : "") // Quote empty arguments.
+        << *p
+        << (**p == '\0' ? "\"" : "");
   }
 
   // Trace verbosity level.
-- 
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