travis: add OS X continous integration

The travis guys were so nice to activate multi OS support for us (it's a beta
feature). So now we build on OS X ass well to check for OS X specific breakage.

Later I might investigate further and build with the minimum supported SDK
version so that we don't break older systems by using newer Cocoa features.

.travis.yml

@@ -1,5 +1,8 @@
 language: c
 
+os:
+  - linux
+  - osx
 env:
   - LIBAV=libav-stable
   - LIBAV=libav-git
@@ -7,24 +10,31 @@ env:
   - LIBAV=ffmpeg-git
 compiler:
   - clang
+
 branches:
   only:
     - master
     - ci
 
+matrix:
+  exclude:
+    - os: osx
+      env: LIBAV=libav-stable
+    - os: osx
+      env: LIBAV=libav-git
+    - os: osx
+      env: LIBAV=ffmpeg-git
+
 before_install: ./travis-deps libass-stable $LIBAV
 script:
   - ./bootstrap.py
   - ./waf configure
   - ./waf build
 
-notifications-policy: &notifications-policy
-  on_success: change
-  on_failure: always
-
 notifications:
   email: false
   irc:
     channels:
       - "irc.freenode.org#mpv-player-dev"
-    <<: *notifications-policy
+    on_success: change
+    on_failure: always

travis-deps

@@ -89,8 +89,15 @@ end
 
 class Dependencies < TravisDepsBuilder
   def deps
-    sh "sudo apt-get update -y"
-    sh "sudo apt-get install pkg-config fontconfig libfribidi-dev yasm -y"
+    case ENV['TRAVIS_OS_NAME']
+    when 'linux' then
+      sh "sudo apt-get update -y"
+      sh "sudo apt-get install pkg-config fontconfig libfribidi-dev yasm -y"
+    when 'osx' then
+      sh 'brew install pkg-config fontconfig freetype fribidi yasm'
+    else
+      abort "Unrecognized OS"
+    end
   end
 end