Guard Explicit Package Build test from running with older, unsupported toolchains. Catch SwiftDriver's .unableToDecodeFrontendTargetInfo to detect a compiler that is definitely too old for the integreated driver to be used.
Guard Explicit Package Build test from running with older, unsupported toolchains.
Catch SwiftDriver's .unableToDecodeFrontendTargetInfo to detect a compiler that is definitely too old for the integreated driver to be used.

abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager