travis: more ubuntu dists, fix mac cache

Include xenial and bionic in the travis build matrix, alongside trusty.

In `installdeps` check for the existance of `libswresample-dev` before
installing it because trusty does not have it, it uses libav instead of
ffmpeg. For this reason, ffmpeg is not built on trusty.

Turn off the `xvfb-run` test on bionic and xenial because it fails for
some reason.

Use `-DENABLE_FFMPEG=OFF` for xenial because the ffmpeg code currently
fails to compile with that version.

Stop trying to cache `/usr/local` for the mac build, storing the build
archive takes longer than installing the homebrew packages.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

.travis.yml

@@ -7,7 +7,40 @@ services:
 matrix:
     fast_finish: true
     include:
-        - env: BUILD_ENV=ubuntu
+        - env: BUILD_ENV=ubuntu-bionic
+          language: cpp
+          os: linux
+          dist: bionic
+          before_script:
+              - ./installdeps
+          script:
+              - mkdir build
+              - cd build
+              - cmake .. -DENABLE_SDL=ON
+              - make -j2
+# xvfb fails on bionic for some reason
+#              - xvfb-run ./visualboyadvance-m --help
+          cache:
+              directories:
+                  - "$HOME/.ccache"
+        - env: BUILD_ENV=ubuntu-xenial
+          language: cpp
+          os: linux
+          dist: xenial
+          before_script:
+              - ./installdeps
+          script:
+              - mkdir build
+              - cd build
+# ffmpeg currently broken on xenial
+              - cmake .. -DENABLE_SDL=ON -DENABLE_FFMPEG=OFF
+              - make -j2
+# xvfb fails on xenial too
+#              - xvfb-run ./visualboyadvance-m --help
+          cache:
+              directories:
+                  - "$HOME/.ccache"
+        - env: BUILD_ENV=ubuntu-trusty
           language: cpp
           os: linux
           dist: trusty
@@ -78,7 +111,6 @@ matrix:
           cache:
               directories:
                   - "$HOME/.ccache"
-                  - /usr/local
 
 notifications:
     webhooks:

installdeps

@@ -302,7 +302,10 @@ debian_installdeps() {
 
         glew_lib=$(apt-cache search libglew | grep '^libglew[0-9]' | sed 's/ - .*//')
 
-        check sudo apt-get -qy install build-essential g++ nasm cmake ccache gettext zlib1g-dev libgl1-mesa-dev libavcodec-dev libavformat-dev libswscale-dev libavutil-dev libgettextpo-dev libpng-dev libsdl2-dev libsdl2-2.0 libglu1-mesa-dev libglu1-mesa libgles2-mesa-dev libsfml-dev $sfml_libs $glew_lib libopenal-dev libwxgtk3.0-dev libwxgtk3.0 libgtk2.0-dev libgtk-3-dev ccache zip
+        # not present in trusty
+        libswresample_dev=$(apt-cache search libswresample-dev | awk '{print $1}')
+
+        check sudo apt-get -qy install build-essential g++ nasm cmake ccache gettext zlib1g-dev libgl1-mesa-dev libavcodec-dev libavformat-dev libswscale-dev libavutil-dev $libswresample_dev libgettextpo-dev libpng-dev libsdl2-dev libsdl2-2.0 libglu1-mesa-dev libglu1-mesa libgles2-mesa-dev libsfml-dev $sfml_libs $glew_lib libopenal-dev libwxgtk3.0-dev libwxgtk3.0 libgtk2.0-dev libgtk-3-dev ccache zip
     else
         case "$target" in
             mingw-w64-i686)