Perform the CTest Coverage Step as a Dashboard Client.

ctest_coverage([BUILD <build-dir>] [APPEND]
               [LABELS <label>...]
               [RETURN_VALUE <result-var>]
               [CAPTURE_CMAKE_ERROR <result-var]

Collect coverage tool results and stores them in Coverage.xml for submission with the ctest_submit() command.

The options are:

BUILD <build-dir>
Specify the top-level build directory. If not given, the CTEST_BINARY_DIRECTORY variable is used.
Mark Coverage.xml for append to results previously submitted to a dashboard server since the last ctest_start() call. Append semantics are defined by the dashboard server in use. This does not cause results to be appended to a .xml file produced by a previous call to this command.
Filter the coverage report to include only source files labeled with at least one of the labels specified.
RETURN_VALUE <result-var>
Store in the <result-var> variable 0 if coverage tools ran without error and non-zero otherwise.
Store in the <result-var> variable -1 if there are any errors running the command and prevent ctest from returning non-zero if an error occurs.
Suppress any CTest-specific non-error output that would have been printed to the console otherwise. The summary indicating how many lines of code were covered is unaffected by this option.