Generate coverage on Mac call WebKitTools/Script/generate-coverage-data or by hand # delete find . -name '*.gcda' -delete # build, -framework CoreFoundation might suffice as well WebKitTools/Scripts/build-webkit GCC_GENERATE_TEST_COVERAGE_FILES=YES GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=YES EXTRA_LINK=" -ftest-coverage -fprofile-arcs" OTHER_CFLAGS=" -MD " OTHER_LDFLAGS=" -ftest-coverage -fprofile-arcs -framework AppKit" WebKitTools/Scripts/run-webkit-tests WebKitTools/Scripts/run-javascriptcore-tests GCC_GENERATE_TEST_COVERAGE_FILES=YES GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=YES EXTRA_LINK=" -ftest-coverage -fprofile-arcs" OTHER_CFLAGS=" -MD " OTHER_LDFLAGS=" -ftest-coverage -fprofile-arcs -framework AppKit" # Collect files WebKitTools/CodeCoverage/run-generate-coverage-data ../coverage-results/ # Generate graph WebKitTools/CodeCoverage/regenerate-coverage-display ../coverage-results/ ../coverage-results/html