Another attempt at travis C++11

.travis.yml

@@ -13,17 +13,6 @@ compiler:
 os:
 - linux
  
-# Install packages differs for container-based infrastructure
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-    packages:
-      - cmake
-
-      # https://github.com/travis-ci-tester/travis-test-gcc-cxx-11
-      - g++-4.9 
-  
 before_install:
   - sudo apt-get update
   - sudo apt-get install build-essential
@@ -43,6 +32,43 @@ before_script:
   - sudo make -j4 install
   - cd ../..
 
+matrix:
+  include:
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env: COMPILER=g++-4.9
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-5
+      env: COMPILER=g++-5
+    - compiler: clang
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.6
+          packages:
+            - clang-3.6
+      env: COMPILER=clang++-3.6
+    - compiler: clang
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.7
+          packages:
+            - clang-3.7
+      env: COMPILER=clang++-3.7  
+  
 script:
   - mkdir build
   - cd build