CMAKE_DEBUG_POSTFIX
From Get docs
Cmake/docs/3.21/variable/cmake debug postfix
CMAKE_DEBUG_POSTFIX
See variable CMAKE__POSTFIX.
This variable is a special case of the more-general CMAKE__POSTFIX variable for the DEBUG
configuration.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.21/variable/CMAKE_DEBUG_POSTFIX.html