Restore support for ancient Mac OS

boostorg / core

Boost Core Utilities

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Restore support for ancient Mac OS #92

Closed evanmiller closed 3 years ago

evanmiller commented 3 years ago

Mac OS 10.4 and earlier lack Availability.h, causing compilation to fail. Rearrange the macro logic to include Availability.h only if we already think there may be support for uncaught exceptions.

Lastique commented 3 years ago

Thanks.