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-rw-r--r--elaborate.cxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/elaborate.cxx b/elaborate.cxx
index d0665c90..e9746cdd 100644
--- a/elaborate.cxx
+++ b/elaborate.cxx
@@ -1229,7 +1229,7 @@ systemtap_session::print_error (const semantic_error& e)
}
void
-systemtap_session::print_warning (string message_str)
+systemtap_session::print_warning (const string& message_str)
{
// Duplicate elimination
if (seen_warnings.find (message_str) == seen_warnings.end())