Add Ubuntu build with minimum GCC and CMake supported

azure-pipelines.yml

@@ -293,6 +293,48 @@ stages:
       displayName: Print versions
       workingDirectory: build
 
+  ######################################################################
+  - job: BuildUbuntuMinimal
+    displayName: Ubuntu minimal CUDA 9.0 gcc-5 no MKL
+
+    pool:
+      vmImage: ubuntu-16.04
+
+    steps:
+    - checkout: self
+      submodules: true
+
+    # CMake 3.5.1 is the minimum version supported
+    - bash: |
+        wget https://cmake.org/files/v3.5/cmake-3.5.1-Linux-x86_64.tar.gz
+        tar zxf cmake-3.5.1-Linux-x86_64.tar.gz
+        ./cmake-3.5.1-Linux-x86_64/bin/cmake --version
+      displayName: Download CMake 3.5.1
+
+    # The script simplifies installation of different versions of CUDA
+    - bash: ./scripts/ci/install_cuda_ubuntu.sh "9.0"
+      displayName: Install CUDA
+
+    # GCC 5.4 is the minimum version supported
+    - bash: |
+        /usr/bin/gcc-5 --version
+        mkdir -p build
+        cd build
+        CC=/usr/bin/gcc-5 CXX=/usr/bin/g++-5 CUDAHOSTCXX=/usr/bin/g++-5 \
+        ./cmake-3.5.1-Linux-x86_64/bin/cmake .. -DCOMPILE_CPU=on
+      displayName: Configure CMake
+
+    - bash: make -j3
+      displayName: Compile
+      workingDirectory: build
+
+    - bash: |
+        ./marian --version
+        ./marian-decoder --version
+        ./marian-scorer --version
+      displayName: Print versions
+      workingDirectory: build
+
   ######################################################################
   - job: BuildMacOS
     displayName: macOS CPU clang