ci: Include Debug build in Travis CI build, refactor build matrix

.travis.yml

@@ -27,39 +27,40 @@ env:
   - WITH_TBB=${WITH_TBB:-ON}           # build with TBB is always recommended
   - WITH_FLANN=${WITH_FLANN:-ON}       # build with FLANN is optional, but requires only little extra build time
   - WITH_FLTK=${WITH_FLTK:-ON}         # build with FLTK-based Viewer when WITH_VTK is turned ON
+  - WITH_VTK=${WITH_VTK:-ON}           # by default, build with VTK
   - WITH_ITK=${WITH_ITK:-OFF}          # required by ANTs N4 which is included in DrawEM package
-                      # exclude DrawEM from Travis CI build for now, see https://github.com/MIRTK/DrawEM/pull/27
+                                       # exclude DrawEM from Travis CI build for now, see https://github.com/MIRTK/DrawEM/pull/27
+  - BUILD_TYPE=Release                 # default build configuration
   # build and deployment of AppImage for Linux
   - AppImage_BUILD=${AppImage_BUILD:-ON}
   - AppImage_BRANCH=${AppImage_BRANCH:-master}
   - AppImage_DEVEL=${AppImage_DEVEL:-ON}
   - AppImage_LATEST=${AppImage_LATEST:-ON}
   - AppImage_RELEASE=${AppImage_RELEASE}
-  matrix:
-  - WITH_VTK=OFF      # make sure that MIRTK can be build fine without VTK
-  - WITH_VTK=ON       # test build with all moduldes, including those using VTK
 
-matrix:
+jobs:
+  include:
+    # build optimized code with all modules for AppImage generation
+    - os: linux
+      compiler: g++
+      env: BUILD_TYPE=Release WITH_VTK=ON
+    # ensure assertions and debug code compiles
+    - os: linux
+      compiler: g++
+      env: BUILD_TYPE=Debug WITH_VTK=ON
+    # make sure that MIRTK can be build fine without VTK
+    - os: linux
+      compiler: g++
+      env: BUILD_TYPE=Release WITH_VTK=OFF
+    # build on macOS using clang and recent VTK version
+    - os: osx
+      compiler: clang
+      env: BUILD_TYPE=Release WITH_VTK=ON
+  # the osx build often breaks with homebrew changes, so we allow it to fail on master
   allow_failures:
-    # the osx build often breaks with homebrew changes, so we allow it to fail 
     - os: osx
-  exclude:
-  # in order to reduce number of jobs to wait for, test only main compilers 
-  # used on each OS
-  - os: linux
-    compiler: clang
-  - os: osx
-    compiler: g++
-  # travis-ci.org has low capacity for macOS jobs, thus reduce number of 
-  # macOS jobs to only the essential ones. With the following, we only need 
-  # to wait for one macOS job.  
-  # Because on macOS usually a very recent VTK version is installed with 
-  # Homebrew, it is more interesting to build with VTK on macOS than on 
-  # Ubuntu. When the GCC build without VTK on Ubuntu succeeds, chances 
-  # are very high it also builts fine on macOS.
-  - os: osx
-    compiler: clang
-    env: WITH_VTK=OFF
+      if: branch = master
+  fast_finish: true
 
 cache:
   ccache: true
@@ -78,7 +79,7 @@ script:
   - Scripts/travis.sh
 
 after_success:
-  - if [ "$AppImage_BUILD" = ON ] && [ "$TRAVIS_REPO_SLUG" = "BioMedIA/MIRTK" ] && [ "$TRAVIS_BRANCH" = "$AppImage_BRANCH" ] && [ "$TRAVIS_PULL_REQUEST" = false ] && [ "$TRAVIS_OS_NAME" = linux ] && [ "$WITH_VTK" = ON ]; then
+  - if [ "$AppImage_BUILD" = ON ] && [ "$TRAVIS_REPO_SLUG" = "BioMedIA/MIRTK" ] && [ "$TRAVIS_BRANCH" = "$AppImage_BRANCH" ] && [ "$TRAVIS_PULL_REQUEST" = false ] && [ "$TRAVIS_OS_NAME" = linux ] && [ "$WITH_VTK" = ON ] && [ "$BUILD_TYPE" = Release ]; then
       export AppImage_BINTRAY=ON;
     else
       export AppImage_BINTRAY=OFF;

Scripts/install_depends.sh

@@ -220,7 +220,7 @@ if [ $WITH_VTK = ON ] && [ -n "$VTK_VERSION" ]; then
   # build configuration
   cmake_args=(
     -DCMAKE_INSTALL_PREFIX="$vtk_prefix"
-    -DCMAKE_BUILD_TYPE=Release
+    -DCMAKE_BUILD_TYPE=${BUILD_TYPE:-Release}
   )
   # pre-requisites to use system installations
   if [ $os = osx ] || [ $os = Darwin ]; then

Scripts/travis.sh

@@ -82,7 +82,7 @@ fi
 mkdir Build && cd Build
 run "$cmake_cmd" \
       -D CMAKE_INSTALL_PREFIX=/usr \
-      -D CMAKE_BUILD_TYPE=Release \
+      -D CMAKE_BUILD_TYPE=${BUILD_TYPE:-Release} \
       -D BUILD_SHARED_LIBS=ON \
       -D BUILD_APPLICATIONS=ON \
       -D BUILD_TESTING=$TESTING \