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