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Commit 870d849d authored by Nick Zitzmann's avatar Nick Zitzmann Committed by GitHub
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configure: check for __builtin_available() availability (#1788)

This change does two things:
1. It un-breaks the build in Xcode 9.0. (Xcode 9.0 is currently
   failing trying to compile connectx() in lib/connect.c.)
2. It finally weak-links the connectx() function, and falls back on
   connect() when run on older operating systems.
parent ca9630f1
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