Build benchmark tests in Travis.

.travis.yml

@@ -125,6 +125,12 @@ matrix:
       script:
         - cargo fmt --all -- --write-mode=diff
 
+    # benchmark tests; built but not run in Travis to avoid inconsistent timing results
+    - rust: nightly
+      env: NAME=bench
+      script:
+        - scripts/build_benches.sh
+
     # compatiblity tests
     - rust: stable
       env: NAME=compatiblity

scripts/build_benches.sh

@@ -0,0 +1,10 @@
+#!/bin/bash -e
+
+set -x
+
+trust_dns_dir=$(dirname $0)/..
+cd $trust_dns_dir
+
+# Benchmark tests build only on nightly
+
+cargo bench --no-run