next try

.travis.yml

@@ -4,23 +4,23 @@ os:
     - linux
     - osx
 
-env:
-    - LANG=cpp-clang
-    - LANG=cpp-gcc
+compiler:
+  - gcc
+  - clang
+ 
 addons:
   apt:
     sources:
         - boost-latest
         - ubuntu-toolchain-r-test
     packages:
-        - g++-4.8
         - libboost1.55-all-dev
 
+matrix:
+  allow_failures:
+    - compiler: clang
 
 before_install:
-    # select C++ compiler
-    - export CXX="clang++" CC="clang"
-    - if [[ $LANG == *gcc ]]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
     # linux prereqisite packages
     - if [ "$TRAVIS_OS_NAME" == "linux" ]; then wget --no-check-certificate https://www.cmake.org/files/v3.2/cmake-3.2.3-Linux-x86_64.tar.gz; fi
     - if [ "$TRAVIS_OS_NAME" == "linux" ]; then tar -xzvf cmake-3.2.3-Linux-x86_64.tar.gz; fi