using GCC 4.8 for Travis

.travis.yml

@@ -2,9 +2,12 @@ language: cpp
 
 compiler:
   - gcc
-  - clang
 
 before_install:
+  - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
+  - sudo apt-get update -qq
+  - if [ "$CXX" = "g++" ]; then sudo apt-get install -qq g++-4.8; fi
+  - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
   - sudo pip install cpp-coveralls
 
 before_script:
@@ -20,3 +23,4 @@ after_success:
   - make json_unit CXXFLAGS="-fprofile-arcs -ftest-coverage"
   - ./json_unit
   - coveralls --exclude lib --exclude tests --gcov-options '\-lp'
+