Fix crash in GraphVizWriter when GRAPHVIZ_TARGET_IGNORE_REGEX is used

GraphVizWriter could crash if GRAPHVIZ_TARGET_IGNORE_REGEX was set.
Patch from Christian Ehrlicher.

Alex

1 files changed, 6 insertions, 0 deletions

diff --git a/Source/cmGraphVizWriter.cxx b/Source/cmGraphVizWriter.cxx
index bdb33bcdfc..de95aa5931 100644
--- a/Source/cmGraphVizWriter.cxx
+++ b/Source/cmGraphVizWriter.cxx
@@ -272,6 +272,12 @@ void cmGraphVizWriter::WriteConnections(const char* targetName,
     std::map<cmStdString, cmStdString>::const_iterator libNameIt =
                                           this->TargetNamesNodes.find(libName);
 
+    // can happen e.g. if GRAPHVIZ_TARGET_IGNORE_REGEX is used
+    if(libNameIt == this->TargetNamesNodes.end())
+      {
+      continue;
+      }
+
     std::string connectionName = myNodeName;
     connectionName += "-";
     connectionName += libNameIt->second;