Explicitly setting bazel cache options

.bazelrc

@@ -28,3 +28,11 @@ common --experimental_allow_incremental_repository_updates
 test --test_env=TRAVIS
 test --test_env=DISPLAY
 test --test_env=DASHBOARD_URL
+
+# Set up caching on local disk so incremental builds are faster
+# See https://bazel.build/designs/2016/09/30/repository-cache.html
+build --repository_cache=~/.cache/bazel-repo
+test --repository_cache=~/.cache/bazel-repo
+# See https://docs.bazel.build/versions/master/remote-caching.html#disk-cache
+build --disk_cache=~/.cache/bazel-disk
+test --disk_cache=~/.cache/bazel-disk

.travis.yml

@@ -47,7 +47,8 @@ _browsers:
 
 cache:
   directories:
-    - $HOME/.cache/bazel
+    - $HOME/.cache/bazel-repo
+    - $HOME/.cache/bazel-disk
     - build
 
 matrix: