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add_library(empty1 empty.cpp)
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add_library(empty2 INTERFACE)
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add_library(empty3 INTERFACE)
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target_compile_features(empty3 INTERFACE cxx_std_11)
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target_link_libraries(empty1
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# When starting, $<COMPILE_FEATURES:cxx_std_11> is '0', so 'freeze' the
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# CXX_STANDARD at 98 during computation.
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$<$<COMPILE_FEATURES:cxx_std_11>:empty2>
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# This would add cxx_std_11, but that would require CXX_STANDARD = 11,
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# which is not allowed after freeze. Report an error.
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empty3
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)
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