New in version 3.4.
A list of commands to run at the start of the ctest_memcheck() 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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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CTEST_CUSTOM_PRE_MEMCHECK.html