travis: activate "ccache" cache

diff --git a/.travis.yml b/.travis.yml
index c471b12011d5bca6c21fead3fdddc7a45b92e12f..7f5547348dd3a282bc1d3099ac2f0d4f70ee30e8 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: cpp
 compiler: gcc
 sudo: false
+cache: ccache
 # define dependencies as q4dep and q5dep
 qt4_deps: &q4dep
     - libboost-program-options-dev