CI: updated build script template to avoid unnecessary pushd/popd

.gitlab-ci.yml

@@ -68,12 +68,9 @@ stages:
         - if ! nvidia-smi --list-gpus > /dev/null; then
                 WITH_CUDA_ARCH=7.0;
           fi
-        - mkdir -p "./builddir/$CI_JOB_NAME"
-        - pushd "./builddir/$CI_JOB_NAME"
-        - cmake ../..
-                -G Ninja
+        - cmake -B "./builddir/$CI_JOB_NAME" -S . -G Ninja
                 -DCMAKE_BUILD_TYPE=${BUILD_TYPE}
-                -DCMAKE_INSTALL_PREFIX="$(pwd)/${BUILD_TYPE}_install_prefix"
+                -DCMAKE_INSTALL_PREFIX="$(pwd)/install_prefix/$CI_JOB_NAME"
                 -DWITH_OPENMP=${WITH_OPENMP}
                 -DWITH_MPI=${WITH_MPI}
                 -DWITH_CUDA=${WITH_CUDA}
@@ -88,11 +85,10 @@ stages:
                 -DBUILD_PYTHON=${BUILD_PYTHON}
                 -DWITH_CI_FLAGS=yes
         # "install" implies the "all" target
-        - ninja ${NINJAFLAGS} install
+        - ninja -C "./builddir/$CI_JOB_NAME" ${NINJAFLAGS} install
         - if [[ ${BUILD_TESTS} == "yes" ]] || [[ ${BUILD_MATRIX_TESTS} == "yes" ]]; then
-                ninja test;
+                ninja -C "./builddir/$CI_JOB_NAME" test;
           fi
-        - popd
     variables:
         <<: *default_cmake_flags
         BUILD_TYPE: Debug