New in version 3.4.
The maximum number of warnings in a single build step which will be detected. After this, the ctest_test() command will truncate the output. Defaults to 50.
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_MAXIMUM_NUMBER_OF_WARNINGS.html