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, 1 insertions, 1 deletions

diff --git a/Source/cmCommandArgumentParserHelper.cxx b/Source/cmCommandArgumentParserHelper.cxx
index a7f6b49..64b67c9 100644
--- a/Source/cmCommandArgumentParserHelper.cxx
+++ b/Source/cmCommandArgumentParserHelper.cxx
@@ -137,7 +137,7 @@ char* cmCommandArgumentParserHelper::ExpandVariable(const char* var)
                                      this->Makefile->GetHomeOutputDirectory()))
         {
         cmOStringStream msg;
-        cmListFileBacktrace bt;
+        cmListFileBacktrace bt(this->Makefile->GetLocalGenerator());
         cmListFileContext lfc;
         lfc.FilePath = this->FileName;
         lfc.Line = this->FileLine;