Add to your .travis.yml file.

language: c
after_success:
  - bash <(curl -s https://codecov.io/bash)

C/C++ output gcov reports for all your files covered. To create these files all you need to do is to add the -coverage flag to gcc or clang when building.

clang -coverage -O0 hello.c -o hello
./hello
gcov hello.c

Repository tokens are required for (a) all private repos, (b) public repos not using Travis-CI, CircleCI or AppVeyor. Find your repository token at Codecov and provide via appending -t <your upload token> to you where you upload reports.

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