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, 18 insertions, 0 deletions

diff --git a/Source/cmListFileCache.cxx b/Source/cmListFileCache.cxx
index 34781d32c6..705666d81c 100644
--- a/Source/cmListFileCache.cxx
+++ b/Source/cmListFileCache.cxx
@@ -12,6 +12,7 @@
 #include "cmListFileCache.h"
 
 #include "cmListFileLexer.h"
+#include "cmLocalGenerator.h"
 #include "cmSystemTools.h"
 #include "cmMakefile.h"
 #include "cmVersion.h"
@@ -408,6 +409,23 @@ bool cmListFileParser::AddArgument(cmListFileLexer_Token* token,
 }
 
 //----------------------------------------------------------------------------
+void cmListFileBacktrace::MakeRelative()
+{
+  if (this->Relative)
+    {
+    return;
+    }
+  for (cmListFileBacktrace::iterator i = this->begin();
+       i != this->end(); ++i)
+    {
+    i->FilePath = this->LocalGenerator->Convert(i->FilePath,
+                                                cmLocalGenerator::HOME);
+    }
+  this->Relative = true;
+}
+
+
+//----------------------------------------------------------------------------
 std::ostream& operator<<(std::ostream& os, cmListFileContext const& lfc)
 {
   os << lfc.FilePath;