New in version 3.4.
A list of regular expressions which will be used to exclude files by their path from coverage output by the ctest_coverage() command.
It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.
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https://cmake.org/cmake/help/v3.19/variable/CTEST_CUSTOM_COVERAGE_EXCLUDE.html