Implicit link libraries and flags detected for language <LANG>.
Compilers typically pass language runtime library names and other flags when they invoke a linker. These flags are implicit link options for the compiler’s language. CMake automatically detects these libraries and flags for each language and reports the results in this variable.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_LANG_IMPLICIT_LINK_LIBRARIES.html