Travis: build with Ninja

Because after making fully parallel builds possible we'd better start
using them to keep testing them.

.travis.yml

@@ -29,6 +29,10 @@ addons:
       - libboost-program-options-dev
       - libboost-test-dev
       - google-mock
+      - ninja-build
+
+before_install:
+  - if [[ "${TRAVIS_OS_NAME}" = "osx" ]]; then brew update && brew install ninja; fi
 
 script: ./travis.sh 
 

travis.sh

@@ -4,11 +4,12 @@ gem install bundler
 bundle install
 
 cmake -E make_directory build
-if [ -z ${GMOCK_PATH+x} ]; then
-    cmake -E chdir build cmake -DCUKE_ENABLE_EXAMPLES=on -DGMOCK_VER=${GMOCK_VER} ..
-else
-    cmake -E chdir build cmake -DCUKE_ENABLE_EXAMPLES=on -DGMOCK_SRC_DIR=${GMOCK_PATH} ..
-fi
+cmake -E chdir build cmake \
+    -G Ninja \
+    -DCUKE_ENABLE_EXAMPLES=on \
+    ${GMOCK_PATH:-"-DGMOCK_VER=${GMOCK_VER}"} \
+    ${GMOCK_PATH:+"-DGMOCK_SRC_DIR=${GMOCK_PATH}"} \
+    ..
 cmake --build build
 cmake --build build --target test
 cmake --build build --target features