Catch exceptions as const references (fixes #236)

This fix allows qpdf to compile/test cleanly with gcc 8.

1 files changed, 1 insertions, 1 deletions

diff --git a/libqpdf/MD5.cc b/libqpdf/MD5.cc
index 0504e2d4..275567da 100644
--- a/libqpdf/MD5.cc
+++ b/libqpdf/MD5.cc
@@ -421,7 +421,7 @@ MD5::checkFileChecksum(char const* const checksum,
 	std::string actual_checksum = getFileChecksum(filename, up_to_size);
 	result = (checksum == actual_checksum);
     }
-    catch (std::runtime_error)
+    catch (std::runtime_error const&)
     {
 	// Ignore -- return false
     }