cmake ctest_coverage_collect_gcov(TARBALL) examples

trilinos/Trilinos cmake/SimpleTesting/cmake/ctest-stage-coverage.cmake :27 

ctest_coverage_collect_gcov(TARBALL "${CTEST_BUILD_NAME}-gcov.tar.gz"
                            GCOV_COMMAND ${GCOV_EXECUTABLE}
                            GCOV_OPTIONS --branch-probabilities --hash-filenames --demangled-names --human-readable --display-progress
                            GLOB ON)