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d275da17e4
As explained in https://gitlab.kitware.com/cmake/cmake/-/issues/21045, both branches of an $<IF> generator expression are evaluated eagerly by CMake. As a result, if the non-selected branch contains an invalid generator expression (such as getting the OUTPUT_NAME property of a non-existent target), a hard error will occur. This failed builds using the cxxrt ABI library, which doesn't create a CMake target currently.