How to use codecov.io in a C/C++ project

If you need a good code coverage web reporting tool for a github-hosted project, codecov.io may be your next best friend. I'm already using it on biology and rainbrurpg).

The present article is usable on a C/C++ project using cmake as build system and travis-ci as CI platform.

Codecov.io screenshot
Codecov.io screenshot

Handling coverage in cmake

You first need to install some package (at least on Debian GNU/Linux) :
sudo apt install gcov lcov gcovr

Then, copy the CodeCoverage.cmake in a cmake/ directory inside your project's repository and add this line to your CMakeLists.txt file:
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)

Generate coverage reports and send them

Now, you need to modify your .travis.yml file and add this :
after_success:
  # Creating report
  - cd ${TRAVIS_BUILD_DIR}
  - lcov --version
  - lcov --directory . --capture --output-file coverage.info
  - lcov --remove coverage.info '/usr/*' --output-file coverage.info
  - lcov --list coverage.info #debug info
  # Uploading report to CodeCov
  - bash <(curl -s https://codecov.io/bash) || echo "Codecov did not collect coverage reports"

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