CMAKE_CXX_COMPILER_IMPORT_STD
Added in version 3.30.
A list of C++ standard levels for which import std support exists for the current C++ toolchain. Support for C++<NN> may be detected using a <NN> IN_LIST CMAKE_CXX_COMPILER_IMPORT_STD predicate with the if() command.
Note
This variable is meaningful only when experimental support for import
std; has been enabled by the CMAKE_EXPERIMENTAL_CXX_IMPORT_STD gate.
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https://cmake.org/cmake/help/latest/variable/CMAKE_CXX_COMPILER_IMPORT_STD.html