build: disable logs when date
is not the main CMake project
#755
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When including
date
withadd_subdirectory
, users logs are polluted with config fromdate
. UsingPROJECT_IS_TOP_LEVEL
would be even more appropriate (https://cmake.org/cmake/help/latest/variable/PROJECT_IS_TOP_LEVEL.html#variable:PROJECT_IS_TOP_LEVEL) but it require CMake v3.21 as minimal version.