[PATCH 3/2 xserver] travis: Enable ccache.

[Eric Anholt]

We bind-mount the cache directory into the container.  Cuts build time
from about 4 minutes to 2.

Signed-off-by: Eric Anholt <eric at anholt.net>
---
 .travis.yml | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index e10cfe1e134f..0a136b23dd80 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: c
+cache: ccache
 dist: trusty
 services: docker
 
@@ -6,9 +7,9 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then docker pull anholt/xserver-travis ; fi
 
 before_script:
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then echo FROM anholt/xserver-travis:v3 > Dockerfile ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then echo FROM anholt/xserver-travis:v4 > Dockerfile ; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then echo ADD . /root >> Dockerfile ; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then docker build -t withgit . ; fi
 
 script:
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then docker run withgit /bin/sh -c "cd /root && ./test/scripts/travis-test.sh" ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then docker run --volume $HOME/.ccache:/root/.ccache withgit /bin/sh -c "cd /root && ./test/scripts/travis-test.sh" ; fi
-- 
2.11.0