gitlab-ci nightly gcc 6 and 7 builders to improve coverage

This builds used to happen on renar

.gitlab-ci.yml

@@ -21,6 +21,7 @@
 #     - openmp
 #     - openmpi
 #   * .gitlab/ci/ubuntu1804/base/
+#     - gcc 6.5
 #     - gcc 7.4
 #     - gcc 9
 #     - clang 8
@@ -59,7 +60,7 @@
     - .docker_image
 
 .ubuntu1804: &ubuntu1804
-  image: "kitware/vtkm:ci-ubuntu1804-20200320"
+  image: "kitware/vtkm:ci-ubuntu1804-20200330"
   extends:
     - .docker_image
 

.gitlab/ci/docker/ubuntu1804/base/Dockerfile

@@ -6,6 +6,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
       cmake \
       curl \
       g++ \
+      g++-6 \
       git \
       git-lfs \
       libmpich-dev \

.gitlab/ci/ubuntu1804.yml

@@ -16,7 +16,7 @@ build:ubuntu1804_gcc9:
     CC: "gcc-9"
     CXX: "g++-9"
     CMAKE_BUILD_TYPE: Debug
-    VTKM_SETTINGS: "tbb+openmp+mpi"
+    VTKM_SETTINGS: "tbb+openmp+mpi+shared"
 
 test:ubuntu1804_gcc9:
   tags:
@@ -69,6 +69,73 @@ test:ubuntu1804_gcc7:
   needs:
     - build:ubuntu1804_gcc7
 
+
+# Build on ubuntu1804 with OpenMP and test on ubuntu1804
+# Uses gcc 7.4
+# Runs only on nightlies
+build:ubuntu1804_gcc7_2:
+  tags:
+    - build
+    - vtkm
+    - docker
+    - linux
+  extends:
+    - .ubuntu1804
+    - .cmake_build_linux
+    - .only-master
+  variables:
+    CC: "gcc-7"
+    CXX: "g++-7"
+    VTKM_SETTINGS: "openmp+shared+examples"
+
+test:ubuntu1804_gcc7_2:
+  tags:
+    - test
+    - vtkm
+    - docker
+    - linux
+  extends:
+    - .ubuntu1804
+    - .cmake_test_linux
+    - .only-master
+  dependencies:
+    - build:ubuntu1804_gcc7_2
+  needs:
+    - build:ubuntu1804_gcc7_2
+
+# Build on ubuntu1804 with OpenMP and test on ubuntu1804
+# Uses gcc 6.5
+# Runs only on nightlies
+build:ubuntu1804_gcc6:
+  tags:
+    - build
+    - vtkm
+    - docker
+    - linux
+  extends:
+    - .ubuntu1804
+    - .cmake_build_linux
+    - .only-master
+  variables:
+    CC: "gcc-6"
+    CXX: "g++-6"
+    VTKM_SETTINGS: "openmp+shared"
+
+test:ubuntu1804_gcc6:
+  tags:
+    - test
+    - vtkm
+    - docker
+    - linux
+  extends:
+    - .ubuntu1804
+    - .cmake_test_linux
+    - .only-master
+  dependencies:
+    - build:ubuntu1804_gcc6
+  needs:
+    - build:ubuntu1804_gcc6
+
 # Build on ubuntu1804 with TBB and test on ubuntu1804
 # Uses clang 8
 build:ubuntu1804_clang8: