Clean up OS X build slightly. Better error on failure of xmlSecDSigCtxSign.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/signer.cc b/src/signer.cc
index 63da8d8e..11cf5eb8 100644
--- a/src/signer.cc
+++ b/src/signer.cc
@@ -25,6 +25,7 @@
 #include <libcxml/cxml.h>
 #include "signer.h"
 #include "exceptions.h"
+#include "compose.hpp"
 
 using std::string;
 using std::list;
@@ -107,8 +108,9 @@ Signer::add_signature_value (xmlpp::Node* parent, string ns) const
 		throw MiscError ("could not set key name");
 	}
 
-	if (xmlSecDSigCtxSign (signature_context, parent->cobj ()) < 0) {
-		throw MiscError ("could not sign");
+	int const r = xmlSecDSigCtxSign (signature_context, parent->cobj ());
+	if (r < 0) {
+		throw MiscError (String::compose ("could not sign (%1)", r));
 	}
 
 	xmlSecDSigCtxDestroy (signature_context);