[CI] Update CI on mac.

.travis.yml

@@ -8,6 +8,9 @@ env:
     - BUILD_PYTHON_INTERFACE=ON
     - MAKEFLAGS="-j2"
 
+cache:
+  ccache: true
+
 matrix:
   include:
     - name: "Trusty - Release - g++"
@@ -65,19 +68,10 @@ matrix:
       env: BUILD_TYPE=Release
       os: osx
       compiler: clang
-      addons:
-        homebrew:
-          update: true
-          packages:
-            - git # build
-            - doxygen # build
-            - cmake # build
-            - pkg-config # build
-            - boost
-            - brewsci/homebrew-science/cddlib
-            - assimp
-            - eigen
-            - octomap
+      cache:
+        ccache: true
+        directories:
+          - $HOME/Library/Caches/Homebrew
 
 before_install:
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then source travis_custom/custom_before_install_linux.sh ; fi

travis_custom/custom_before_install_osx.sh

@@ -2,7 +2,7 @@
 brew tap gepetto/homebrew-gepetto
 
 # install eigenpy
-brew install eigenpy
+brew install boost assimp eigen octomap eigenpy
 
 # set environment variables
 export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:/opt/openrobots/lib/pkgconfig"