From bb58317939d7fa4ee2bb1f95760e6d6db7bfa06e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jurko=20Gospodneti=C4=87?= <jurko.gospodnetic@pke.hr>
Date: Tue, 7 Aug 2012 13:09:31 +0000
Subject: [PATCH] Boost Build cleanup - errors.backtrace rule no longer
 displays an extra empty line if asked to list user modules only and there are
 no user modules in the current call stack.

[SVN r79904]
---
 v2/kernel/errors.jam | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/v2/kernel/errors.jam b/v2/kernel/errors.jam
index aaada5639..8ebabfd9e 100644
--- a/v2/kernel/errors.jam
+++ b/v2/kernel/errors.jam
@@ -23,7 +23,10 @@ rule backtrace ( skip-frames prefix messages * : * )
     if $(.user-modules-only)
     {
         local bt = [ nearest-user-location ] ;
-        ECHO "$(prefix) at $(bt) " ;
+        if $(bt)
+        {
+            ECHO "$(prefix) at $(bt) " ;
+        }
         for local n in $(args)
         {
             if $($(n))-is-defined