Remove OPENSWIFTUI_RELEASE_2021 support (#275)

Author: Kyle-Ye

.github/workflows/ios.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         os: [macos-15]
         xcode-version: ["16.0"]
-        release: [2021, 2024]
+        release: [2024]
         ios-version: ["18.0"]
         include:
           - ios-version: "18.0"

.github/workflows/macos.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         os: [macos-15]
         xcode-version: ["16.0"]
-        release: [2021, 2024]
+        release: [2024]
     runs-on: ${{ matrix.os }}
     env:
       OPENSWIFTUI_WERROR: 1

Package.swift

@@ -56,8 +56,8 @@ var sharedSwiftSettings: [SwiftSetting] = [
 let releaseVersion = Context.environment["OPENSWIFTUI_TARGET_RELEASE"].flatMap { Int($0) } ?? 2024
 sharedCSettings.append(.define("OPENSWIFTUI_RELEASE", to: "\(releaseVersion)"))
 sharedSwiftSettings.append(.define("OPENSWIFTUI_RELEASE_\(releaseVersion)"))
-if releaseVersion >= 2021 {
-    for year in 2021 ... releaseVersion {
+if releaseVersion >= 2024 {
+    for year in 2024 ... releaseVersion {
         sharedSwiftSettings.append(.define("OPENSWIFTUI_SUPPORT_\(year)_API"))
     }
 }
@@ -450,7 +450,6 @@ if attributeGraphCondition || renderBoxCondition {
     let release = Context.environment["DARWIN_PRIVATE_FRAMEWORKS_TARGET_RELEASE"].flatMap { Int($0) } ?? 2024
     package.platforms = switch release {
         case 2024: [.iOS(.v18), .macOS(.v15), .macCatalyst(.v18), .tvOS(.v18), .watchOS(.v10), .visionOS(.v2)]
-        case 2021: [.iOS(.v15), .macOS(.v12), .macCatalyst(.v15), .tvOS(.v15), .watchOS(.v7)]
         default: nil
     }
 }

Sources/OpenSwiftUI/View/InterfaceIdiom/InterfaceIdiom.swift

@@ -4,8 +4,6 @@
 //  Audited for iOS 15.5
 //  Status: Complete
 
-#if OPENSWIFTUI_RELEASE_2021
-
 //struct VersionSeedTracker<Key: HostPreferenceKey> {
 //    var seed: VersionSeed
 //}
@@ -57,5 +55,3 @@
 //        }
 //    }
 //}
-
-#endif