message: use Ninja where possible to do build jobs
diff: @@ -71,18 +71,20 @@ variables:
  build-arch-gcc:
  <<: *build_job_docker
  + script:
  + - scripts/build_gitlab/linux.sh -G Ninja
  build-arch-clang:
  <<: *build_job_docker
  script:
  - export CC=clang
  - export CXX=clang++
  - - scripts/build_gitlab/linux.sh
  + - scripts/build_gitlab/linux.sh -G Ninja
  build-arch-gcc-warnings:
  <<: *build_job_docker
  script:
  - - scripts/build_gitlab/linux.sh -DBUILD_OSPRAY_CI_EXTRAS=ON -DBUILD_OSPRAY_MPI=ON
  + - scripts/build_gitlab/linux.sh -G Ninja -DBUILD_OSPRAY_CI_EXTRAS=ON -DBUILD_OSPRAY_MPI=ON
  allow_failure: true
  build-arch-clang-warnings:
  @@ -90,12 +92,14 @@ build-arch-clang-warnings:
  script:
  - export CC=clang
  - export CXX=clang++
  - - scripts/build_gitlab/linux.sh -DBUILD_OSPRAY_CI_EXTRAS=ON -DBUILD_OSPRAY_MPI=ON
  + - scripts/build_gitlab/linux.sh -G Ninja -DBUILD_OSPRAY_CI_EXTRAS=ON -DBUILD_OSPRAY_MPI=ON
  allow_failure: true
  build-ubuntu1604-gcc:
  <<: *build_job_docker
  image: ospray/docker-images:ubuntu16.04
  + script:
  + - scripts/build_gitlab/linux.sh -G Ninja
  artifacts:
  paths:
  - $CI_PROJECT_DIR
  @@ -104,6 +108,8 @@ build-ubuntu1604-gcc:
  build-ubuntu1804-gcc:
  <<: *build_job_docker
  image: ospray/docker-images:ubuntu18.04
  + script:
  + - scripts/build_gitlab/linux.sh -G Ninja
  artifacts:
  paths:
  - $CI_PROJECT_DIR
  @@ -152,12 +158,12 @@ build-centos7-gcc:
  build-debug:
  <<: *build_job_docker
  script:
  - - scripts/build_gitlab/linux.sh -DCMAKE_BUILD_TYPE=Debug
  + - scripts/build_gitlab/linux.sh -G Ninja -DCMAKE_BUILD_TYPE=Debug
  build-mpi:
  <<: *build_job_docker
  script:
  - - scripts/build_gitlab/linux.sh -DBUILD_OSPRAY_MPI=ON
  + - scripts/build_gitlab/linux.sh -G Ninja -DBUILD_OSPRAY_MPI=ON
  build-osx-clang:
  <<: *build_job_shell
  