[swift-evolution] SE-0151: Package Manager Swift Language Compatibility Version

[Dimitri Racordon]

I guess allowing a list of versions to be specified is interesting for continuous integration.
That would allow people to test their code under all intended supported version.

Dimitri


> On 8 Feb 2017, at 08:19, Martin Waitz via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Hello,
> 
>> The review of SE-0151 “Package Manager Swift Language Compatibility Version" begins now and runs through February 13, 2017.  The proposal is available here:
>> 
>> 	https://github.com/apple/swift-evolution/blob/master/proposals/0151-package-manager-swift-language-compatibility-version.md
> 
> I’ve one question regarding this proposal:
> Why use the list `swiftLanguageVersions` instead of a simple `swiftLanguageVersion: Int = 3`?
> What’s the advantage of being able to specify `[3,4]`?
> 
> If you already have a version 4 compiler, that one will be used anyway and if the source really is compatible with both versions,
> it does not make any difference whether it will be run in version 3 or version 4 mode.
> So just setting it to `3` has the same effect, right?
> 
> I think it’s enough to specify something like „this source is intended to be compiled in swift version 3 mode“.
> Most of the time, that’s all you can specify anyway, because you don’t know which future versions happen to be compatible.
> 
> — 
> Martin
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