Expand Travis configuration

per https://github.com/martinmoene/nonstd-lite/issues/15

Author: martinmoene

.travis.yml

@@ -1,13 +1,10 @@
+os: linux
 dist: trusty
 sudo: false
 group: travis_latest
 language: c++
 cache: ccache
 
-env:
-  global:
-  - COMPILER=g++
-
 addons:
   apt:
     sources: &apt_sources
@@ -21,90 +18,144 @@ addons:
       - llvm-toolchain-trusty-5.0
       - llvm-toolchain-trusty-6.0
 
-compiler: clang
-os: linux
-
 matrix:
-  fast_finish: true
   include:
-    - env: COMPILER=g++-5
+    - os: linux
+      env: COMPILER=g++-4.8
+      compiler: gcc
+      addons: &gcc4_8
+        apt:
+          packages: ["g++-4.8", "python3-pip", "lcov"]
+          sources: *apt_sources
+
+    - os: linux
+      env: COMPILER=g++-4.9
+      compiler: gcc
+      addons: &gcc4_9
+        apt:
+          packages: ["g++-4.9", "python3-pip", "lcov"]
+          sources: *apt_sources
+
+    - os: linux
+      env: COMPILER=g++-5
       compiler: gcc
       addons: &gcc5
         apt:
           packages: ["g++-5", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=g++-6
+    - os: linux
+      env: COMPILER=g++-6
       compiler: gcc
       addons: &gcc6
         apt:
           packages: ["g++-6", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=g++-7
+    - os: linux
+      env: COMPILER=g++-7
       compiler: gcc
       addons: &gcc7
         apt:
           packages: ["g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=clang++-3.5
+    - os: linux
+      env: COMPILER=g++-8
+      compiler: gcc
+      addons: &gcc8
+        apt:
+          packages: ["g++-8", "python3-pip", "lcov"]
+          sources: *apt_sources
+
+    - os: linux
+      env: COMPILER=clang++-3.5
       compiler: clang
-      addons: &clang35
+      addons: &clang3_5
         apt:
           packages: ["clang-3.5", "g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=clang++-3.6
+    - os: linux
+      env: COMPILER=clang++-3.6
       compiler: clang
-      addons: &clang36
+      addons: &clang3_6
         apt:
           packages: ["clang-3.6", "g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=clang++-3.7
+    - os: linux
+      env: COMPILER=clang++-3.7
       compiler: clang
-      addons: &clang37
+      addons: &clang3-7
         apt:
           packages: ["clang-3.7", "g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=clang++-3.8
+    - os: linux
+      env: COMPILER=clang++-3.8
       compiler: clang
-      addons: &clang38
+      addons: &clang3_8
         apt:
           packages: ["clang-3.8", "g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=clang++-3.9
+    - os: linux
+      env: COMPILER=clang++-3.9
       compiler: clang
-      addons: &clang39
+      addons: &clang3_9
         apt:
           packages: ["clang-3.9", "g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=clang++-4.0
+    - os: linux
+      env: COMPILER=clang++-4.0
       compiler: clang
-      addons: &clang40
+      addons: &clang4_0
         apt:
           packages: ["clang-4.0", "g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=clang++-5.0
+    - os: linux
+      env: COMPILER=clang++-5.0
       compiler: clang
-      addons: &clang50
+      addons: &clang5_0
         apt:
           packages: ["clang-5.0", "g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
-    - env: COMPILER=clang++-6.0
+    - os: linux
+      env: COMPILER=clang++-6.0
       compiler: clang
-      addons: &clang60
+      addons: &clang6_0
         apt:
           packages: ["clang-6.0", "g++-7", "python3-pip", "lcov"]
           sources: *apt_sources
 
+    - os: osx
+      env: COMPILER=clang++
+      compiler: clang++
+      osx_image: xcode6
+
+    - os: osx
+      env: COMPILER=clang++
+      compiler: clang++
+      osx_image: xcode7
+
+    - os: osx
+      env: COMPILER=clang++
+      compiler: clang++
+      osx_image: xcode8
+
+    - os: osx
+      env: COMPILER=clang++
+      compiler: clang++
+      osx_image: xcode9
+
 script:
-  - export CXX=$COMPILER
+  - export CXX=${COMPILER}
+  - JOBS=2 # Travis machines have 2 cores.
   - mkdir build && cd build
-  - cmake -G "Unix Makefiles" .. && cmake --build . && ctest
+  - cmake -G "Unix Makefiles" ..
+  - cmake --build . -- -j${JOBS}
+  - ctest --output-on-failure -j${JOBS}