Add coverage of cpp source files using cpp-coveralls

.travis.yml

@@ -53,4 +53,5 @@ before_script:
 script:
   - ./tools/ci/travis-script.sh
 after_success:
-  - coveralls
+  - cpp-coveralls --exclude-pattern "/usr/*" --dump cpp_cov.json
+  - coveralls --merge=cpp_cov.json

CMakeLists.txt

@@ -95,6 +95,10 @@ if(optimize)
   list(REMOVE_ITEM cxxflags -O2)
   list(APPEND cxxflags -O3)
 endif()
+if(coverage)
+  list(APPEND cxxflags --coverage)
+  list(APPEND ldflags --coverage)
+endif()
 
 # Show flags being used
 message(STATUS "OpenMC C++ flags: ${cxxflags}")

tools/ci/travis-install.py

@@ -48,6 +48,9 @@ def install(omp=False, mpi=False, phdf5=False, dagmc=False):
     if dagmc:
         cmake_cmd.append('-Ddagmc=ON')
 
+    # Build in coverage mode for coverage testing
+    cmake_cmd.append('-Dcoverage=on')
+
     # Build and install
     cmake_cmd.append('..')
     print(' '.join(cmake_cmd))

tools/ci/travis-install.sh

@@ -25,5 +25,8 @@ python tools/ci/travis-install.py
 # Install Python API in editable mode
 pip install -e .[test,vtk]
 
-# For uploading to coveralls
+# For coverage testing of the C++ source files
+pip install cpp-coveralls
+
+# For coverage testing of the Python source files
 pip install coveralls