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[SR-2709] @available(swift N) to match -swift-version N #45313

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swift-ci opened this issue Sep 21, 2016 · 3 comments
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[SR-2709] @available(swift N) to match -swift-version N #45313

swift-ci opened this issue Sep 21, 2016 · 3 comments
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compiler The Swift compiler in itself improvement

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swift-ci commented Sep 21, 2016

Previous ID SR-2709
Radar rdar://problem/30034329
Original Reporter graydon (JIRA User)
Type Improvement
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement
Assignee graydon (JIRA)
Priority Medium

md5: 70a882de5a4a030863b28ba3fa99ae94

Issue Description:

The recently-added -swift-version N flag in SR-2582 only affects the #if swift(>=N) compiler-control statements, which is not sufficient for shipping a library with parts that are unconditionally compiled but conditionally available. For the latter, we need to support something like @available(swift N) similar to the platform availability tests.

The exact semantics are a bit subtle; as far as I can tell, swift-version unavailability should override platform availability, but swift-version availability should not override platform unavailability. That is, swift-version availability should be considered in conjunction, not disjunction, with platform availability. We don't exactly have a way to write availability conjuncts at the moment, so as an initial implementation we might just prohibit combining `@available(swift N)` with any other platform-availability spec in the same attribute argument list.

Other suggestions welcome!

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swift-ci commented Sep 24, 2016

Comment by Graydon Hoare (JIRA)

Proposal under review in https://lists.swift.org/pipermail/swift-evolution-announce/2016-September/000286.html

Preliminary implementation is available #4985

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swift-ci commented Nov 9, 2016

Comment by Graydon Hoare (JIRA)

Merged 28b13a1

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swift-ci commented Jan 16, 2017

Comment by Myke Olson (JIRA)

@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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Labels
compiler The Swift compiler in itself improvement
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