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generate GCC code coverage reports


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Gcovr provides a utility for managing the use of the GNU gcov utility and generating summarized code coverage results. This command is inspired by the Python package, which provides a similar utility for Python.

The gcovr command can produce different kinds of coverage reports:

  • default: compact human-readable summaries
  • --xml: machine readable XML reports in Cobertura format
  • --html: HTML summaries
  • --html-details: HTML report with annotated source files

Thus, gcovr can be viewed as a command-line alternative to the lcov utility, which runs gcov and generates an HTML-formatted report. The development of gcovr was motivated by the need for text summaries and XML reports.

Example HTML summary:


Example HTML details:



Gcovr is available as a Python package that can be installed via pip.

Install newest stable gcovr release from PyPI:

pip install gcovr

Install development version from GitHub:

pip install git+


GCC can instrument the executables to emit coverage data. You need to recompile your code with the following flags:

-fprofile-arcs -ftest-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.

gcovr -r .

You can also generate detailed HTML reports:

gcovr -r . --html --html-details -o 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. The -r option should point to the root of your project. This only matters if you have a separate build directory.

For complete documentation, read the manual.


If you want to report a bug or contribute to gcovr development, please read our contributing guidelines first:


Copyright 2013-2018 the gcovr authors

Copyright 2013 Sandia Corporation. Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains certain rights in this software.

Gcovr is available under the 3-clause BSD License. See LICENSE.txt for full details. See AUTHORS.txt for the full list of contributors.

Gcovr development moved to this repository in September, 2013 from Sandia National Laboratories.