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This is the Swift 5.5 nomination of fixes for @available() annotations merged to mainline in #220.

(cherry picked from commit 21a7918)

…h as during Swift toolchain build) (#220)

If it is not set in the environment, stay with the default minimum deployment target of 10.10 on macOS.

This aligns with both swift-package-manager and with swift-driver, and is important now that ToolSupportCore has started containing some code that is annotated with availability for Darwin platforms.  It uses the more project-neutral name `SWIFT_TOOLCHAIN_MACOS_DEPLOYMENT_TARGET` and the expectation is that both SwiftPM and SwiftDriver will switch to using it as well.

(cherry picked from commit 21a7918)
@abertelrud abertelrud changed the base branch from main to release/5.5 June 12, 2021 23:14
@abertelrud abertelrud self-assigned this Jun 12, 2021
@abertelrud abertelrud added the swift 5.5 This PR targets the 5.5 branch label Jun 12, 2021
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@swift-ci please test

import class Foundation.ProcessInfo

let macOSPlatform: SupportedPlatform
if let deploymentTarget = ProcessInfo.processInfo.environment["SWIFT_TOOLCHAIN_MACOS_DEPLOYMENT_TARGET"] {
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@abertelrud are we also changing SwiftPM to use this instead?

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Yes, that's the plan, although this needs to be coordinated with @shahmishal. But I can put up a SwiftPM and SwiftDriver change to favour SWIFT_TOOLCHAIN_MACOS_DEPLOYMENT_TARGET and for now falling back on SWIFTPM_MACOS_DEPLOYMENT_TARGET until the new one is set in toolchain builds.

@abertelrud abertelrud merged commit 0f21a8f into release/5.5 Jun 14, 2021
@abertelrud abertelrud deleted the eng/anders/allow-newer-min-deployment-target-5.5 branch August 5, 2021 15:21
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