CTEST_CUSTOM_MAXIMUM_FAILED_TEST_OUTPUT_SIZE
When saving a failing test’s output, this is the maximum size, in bytes, that will be collected by the ctest_test() command. Defaults to 307200 (300 KiB).
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/v3.9/variable/CTEST_CUSTOM_MAXIMUM_FAILED_TEST_OUTPUT_SIZE.html