Code Coverage

With g++ and lcov

• Compile with no optimization: -O0 --coverage. Will output *.gcno.
• Run the binary. Will output *.gcda.
• Generate lcov trace from the directory with *.gcdas:

  lcov --rc lcov_branch_coverage=1 --capture --directory . --output-file coverage.info
• Generate htmls:

  genhtml --rc genhtml_branch_coverage=1 coverage.info --output-directory out
• Note: you need the rc flags to show branch coverage.

With clang and llvm-cov

• Follow the instructions in: https://clang.llvm.org/docs/SourceBasedCodeCoverage.html