backtrace: Convert to local paths in IssueMessage

This is the only place we care show the FilePath to the user, so defer
the expensive relative path calculation until here.

1 files changed, 16 insertions, 1 deletions

diff --git a/Source/cmListFileCache.h b/Source/cmListFileCache.h
index bede25e658..2ca9b8ea0a 100644
--- a/Source/cmListFileCache.h
+++ b/Source/cmListFileCache.h
@@ -14,6 +14,8 @@
 
 #include "cmStandardIncludes.h"
 
+class cmLocalGenerator;
+
 /** \class cmListFileCache
  * \brief A class to cache list file contents.
  *
@@ -66,7 +68,20 @@ struct cmListFileFunction: public cmListFileContext
   std::vector<cmListFileArgument> Arguments;
 };
 
-class cmListFileBacktrace: public std::vector<cmListFileContext> {};
+class cmListFileBacktrace: public std::vector<cmListFileContext>
+{
+  public:
+    cmListFileBacktrace(cmLocalGenerator* localGen)
+      : LocalGenerator(localGen)
+      , Relative(localGen ? false : true)
+    {
+    }
+
+    void MakeRelative();
+  private:
+    cmLocalGenerator* LocalGenerator;
+    bool Relative;
+};
 
 struct cmListFile
 {