Trying Travis with gcc again

.travis.yml

@@ -2,13 +2,21 @@ language: cpp
 
 compiler:
     - clang
+    - gcc
 
 before_install:
-    - sudo add-apt-repository ppa:zoogie/sdl2-snapshots
+    - sudo add-apt-repository -y ppa:zoogie/sdl2-snapshots
+    - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
     - sudo apt-get -qq -y update
 
 install:
     - sudo apt-get -qq -y install libsdl2 libsdl2-ttf libalut-dev libpng12-dev zlib1g-dev
+    - if [ "$CC" = "gcc" ]; then sudo apt-get install gcc-4.8; fi
+    - if [ "$CXX" = "g++" ]; then sudo apt-get install g++-4.8; fi
+
+before_script:
+    - if [ "$CC" = "gcc" ]; then export CC="gcc-4.8"; fi
+    - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8"; fi
 
 script:
     - (mkdir build && cd build && cmake .. && make)