gcovr command provides a summary of the lines that have been
executed in a program. Code coverage statistics help you discover
untested parts of a program, which is particularly important when
assessing code quality. Well-tested code is a characteristic of
high quality code, and software developers often assess code coverage
statistics when deciding if software is ready for a release.
GCC can instrument the executables to emit coverage data. You need to recompile your code with the following flags:
--coverage -g -O0
Next, run your test suite. This will generate raw coverage files.
Finally, invoke gcovr. This will print a tabular report on the console.
You can also generate detailed HTML reports:
gcovr --html-details coverage.html
Gcovr will create one HTML report per source file next to the coverage.html summary.
You should run gcovr from the build directory.
-r option should point to the root of your project.
This only matters if you have a separate build directory.
cd build; gcovr -r ..