rec: Fix 'adding an integer to a string does not append to it' error

(cherry picked from commit 1763442754e6a30dd0fc0c6a37316c2b30b9a3b8)

diff --git a/pdns/pdns_recursor.cc b/pdns/pdns_recursor.cc
index 24c5dffe62a0e5bf1aaea79fb9a82d1490fc6d1f..6175af2f2e96bb3ef1623a1998a44b243a6c4bdd 100644 (file)
--- a/pdns/pdns_recursor.cc
+++ b/pdns/pdns_recursor.cc
@@ -2331,7 +2331,7 @@ void distributeAsyncFunction(const string& packet, const pipefunc_t& func)
     if (error == EAGAIN || error == EWOULDBLOCK) {
       g_stats.queryPipeFullDrops++;
     } else {
-      unixDie("write to thread pipe returned wrong size or error:" + error);
+      unixDie("write to thread pipe returned wrong size or error:" + std::to_string(error));
     }
   }
 }