made clang warnings fail (-Werror)

in order to catch them in CI tests

diff --git a/.travis.yml b/.travis.yml
index 00cd40e..3353dee 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,7 +33,7 @@ matrix:
             - gcc-multilib
 
     # presume clang >= v3.9.0
-    - env: Ubu=14.04 Cmd='make usan MOREFLAGS=-Wcomma' COMPILER=clang
+    - env: Ubu=14.04 Cmd='make usan MOREFLAGS=-Wcomma -Werror' COMPILER=clang
       dist: trusty
       sudo: required
       addons: