Refactor travis.yml

Shorten by using matrix key and add -Werror compiler flag.

Signed-off-by: Jacob Perron <jacobmperron@gmail.com>

.travis.yml

@@ -2,54 +2,29 @@ sudo: required
 
 language: cpp
 
-services:
-  - docker
-
 compiler:
   - gcc
 
-jobs:
+matrix:
   include:
-    - stage: test
+    - os: linux
       dist: trusty
-      before_install:
+    - os: linux
-        - sudo apt-get update -qq
+      dist: xenial
-        - sudo apt-get install build-essential cmake libboost-system-dev libboost-thread-dev libgtest-dev
+    - os: linux
-        - cd /usr/src/gtest
+      dist: bionic
-        - sudo cmake CMakeLists.txt
+
-        - sudo make
+before_install:
-        - sudo cp *.a /usr/lib
+  - sudo apt-get update -qq
-      script:
+  - sudo apt-get install build-essential cmake libboost-system-dev libboost-thread-dev libgtest-dev
-        - cd ${TRAVIS_BUILD_DIR}
+  - cd /usr/src/gtest
-        - cmake --version
+  - sudo cmake CMakeLists.txt
-        - cmake .
+  - sudo make
-        - make
+  - sudo cp *.a /usr/lib
-        - make test
+
-    - dist: xenial
+script:
-      before_install:
+  - cd ${TRAVIS_BUILD_DIR}
-        - sudo apt-get update -qq
+  - cmake --version
-        - sudo apt-get install build-essential cmake libboost-system-dev libboost-thread-dev libgtest-dev
+  - cmake -DCMAKE_CXX_FLAGS="-Werror" .
-        - cd /usr/src/gtest
+  - make
-        - sudo cmake CMakeLists.txt
+  - make test
-        - sudo make
-        - sudo cp *.a /usr/lib
-      script:
-        - cd ${TRAVIS_BUILD_DIR}
-        - cmake --version
-        - cmake .
-        - make
-        - make test
-    - dist: bionic
-      before_install:
-        - sudo apt-get update -qq
-        - sudo apt-get install build-essential cmake libboost-system-dev libboost-thread-dev libgtest-dev
-        - cd /usr/src/gtest
-        - sudo cmake CMakeLists.txt
-        - sudo make
-        - sudo cp *.a /usr/lib
-      script:
-        - cd ${TRAVIS_BUILD_DIR}
-        - cmake --version
-        - cmake .
-        - make
-        - make test