Support for gcovr's search-paths feature

[shutaozhenzhen]

I hope to support the search-paths feature of gcovr. I am using ceedling in a codebase with a layered architecture design, where each layer has unit tests, which may result in gcov files generated by different unit test projects being located in different positions. To allow gcovr to recognize all files, I set the root of gcovr to the root path of the codebase, causing gcov files generated by different unit test projects to all be detected by gcovr. I hope to limit the search for gcovr files to the current folder, which requires using the search-paths feature of gcovr.

[art-of-dom]

The gcovr plugin basically can be configured via yaml to pass args directly to gcovr like you would command line. It does not have all flags available, but it's easy to add more to. See https://github.com/ThrowTheSwitch/Ceedling/blob/master/plugins/gcov/lib/gcovr_reportinator.rb#L136.

In this case I'd assume we'd want to pass the extra search paths similar to the exclude array, but as the last argument. If you can provide an example of the final gcovr cli command you would expect that may help too.

[shutaozhenzhen]

gcovr -v --root ../../../../  --output "build/artifacts/gcov/gcovr/coverage.txt" build

assign build to only filter files in build dir.
../../../../ is my source tree root path
By the way, it seems that currently you also can't specify -v

[shutaozhenzhen]

Perhaps there could be a dedicated parameter, similar to acommand hook, takes an array, concatenates all its contents, and appends them at the end as a configuration for when additional parameters need to be added.