[embedded] Skip checking OS versions of target triples when Embedded Swift is used

Author: kubamracek

Sources/SwiftDriver/Toolchains/DarwinToolchain.swift

@@ -238,6 +238,11 @@ public final class DarwinToolchain: Toolchain {
  return
  }
 
+ // Embedded Swift should accept all target triples / OS versions / arch combinations
+ guard !parsedOptions.isEmbeddedEnabled else {
+ return
+ }
+
  // Check minimum supported OS versions. Note that Mac Catalyst falls into the iOS device case. The driver automatically uplevels the deployment target to iOS >= 13.1.
  let minVersions: [Triple.OS: (DarwinPlatform, Triple.Version)] = [
  .macosx: (.macOS, Triple.Version(10, 9, 0)),

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -6880,6 +6880,13 @@ final class SwiftDriverTests: XCTestCase {
  }
  }
 
+ // 32-bit iOS jobs under Embedded should be allowed regardless of OS version
+ do {
+ try Driver(args: ["swiftc", "-c", "-target", "armv7-apple-ios8", "-enable-experimental-feature", "Embedded", "foo.swift"])
+ try Driver(args: ["swiftc", "-c", "-target", "armv7-apple-ios12.1", "-enable-experimental-feature", "Embedded", "foo.swift"])
+ try Driver(args: ["swiftc", "-c", "-target", "armv7-apple-ios16", "-enable-experimental-feature", "Embedded", "foo.swift"])
+ }
+
  do {
  let diags = DiagnosticsEngine()
  var driver = try Driver(args: ["swiftc", "-target", "arm64-apple-macosx10.13", "test.swift", "-enable-experimental-feature", "Embedded", "-parse-as-library", "-wmo", "-o", "a.out", "-module-name", "main", "-enable-library-evolution"], diagnosticsEngine: diags)