travis: add compiler

proppy · proppy · commit 704dc4e6b941 · 2016-04-15T17:16:45.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,5 +6,8 @@ addons:
     - ubuntu-toolchain-r-test
     packages:
     - g++-4.9
+compiler:
+  - clang
+  - g++-4.9
 script:
 - make -C test/modem/
