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Use
cfg(os_version_min)to avoid weak linkage when we statically know that a symbol is available.Builds upon #136867 (tracking issue #136866), hence why this is still a draft. See the diff in the last commit.
NOTE: This partly exposes implementation details of
cfg(os_version_min)to-Zbuild-std, namely the ability to unconditionally select the newer implementations when passing*_DEPLOYMENT_TARGET. This should only be a performance improvement (or a regression, if we decide to remove the feature in the future).r? rust-lang/libs
@rustbot label O-apple O-unix O-android