Use swift-driver triple (swiftlang#6627)

Removes and replaces the custom LLVM Triple type from the Basics module
with the implementation from SwiftDrvier. This change allows spm to
understand all triples that swift-driver already does and resolves some
issues surrounding incorrect triple parsing. For example the
Basics.Triple was not able to parse 'armv7em-apple-none-eabihf-macho'
where as SwiftDriver.Triple can.

Package.swift

@@ -154,7 +154,7 @@ let package = Package(
                 .product(name: "SwiftToolsSupport-auto", package: "swift-tools-support-core"),
                 .product(name: "SystemPackage", package: "swift-system"),
             ],
-            exclude: ["CMakeLists.txt"]
+            exclude: ["CMakeLists.txt", "Vendor/README.md"]
         ),
 
         .target(

Sources/Basics/CMakeLists.txt

@@ -53,9 +53,11 @@ add_library(Basics
   String+Extensions.swift
   SwiftVersion.swift
   SQLiteBackedCache.swift
-  Triple.swift  
+  Triple+Basics.swift
   Version+Extensions.swift
-  WritableByteStream+Extensions.swift)
+  WritableByteStream+Extensions.swift
+  Vendor/Triple.swift
+  Vendor/Triple+Platforms.swift)
 target_link_libraries(Basics PUBLIC
   SwiftCollections::DequeModule
   SwiftCollections::OrderedCollections

Sources/Basics/Triple+Basics.swift

@@ -0,0 +1,198 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift open source project
+//
+// Copyright (c) 2014-2023 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import enum TSCBasic.JSON
+import class TSCBasic.Process
+
+extension Triple {
+    public init(_ description: String) throws {
+        self.init(description, normalizing: false)
+    }
+}
+
+extension Triple {
+    public static let macOS = try! Self("x86_64-apple-macosx")
+}
+
+extension Triple {
+    public func isApple() -> Bool {
+        vendor == .apple
+    }
+
+    public func isAndroid() -> Bool {
+        os == .linux && environment == .android
+    }
+
+    public func isDarwin() -> Bool {
+        switch (vendor, os) {
+        case (.apple, .noneOS):
+            return false
+        case (.apple, _), (_, .macosx), (_, .darwin):
+            return true
+        default:
+            return false
+        }
+    }
+
+    public func isLinux() -> Bool {
+        os == .linux
+    }
+
+    public func isWindows() -> Bool {
+        os == .win32
+    }
+
+    public func isWASI() -> Bool {
+        os == .wasi
+    }
+
+    public func isOpenBSD() -> Bool {
+        os == .openbsd
+    }
+
+    /// Returns the triple string for the given platform version.
+    ///
+    /// This is currently meant for Apple platforms only.
+    public func tripleString(forPlatformVersion version: String) -> String {
+        precondition(isDarwin())
+        // This function did not handle triples with a specific environments and
+        // object formats previously to using SwiftDriver.Triple and still does
+        // not.
+        return """
+            \(self.archName)-\
+            \(self.vendorName)-\
+            \(self.osNameUnversioned)\(version)
+            """
+    }
+
+    public var tripleString: String {
+        self.triple
+    }
+
+    /// Determine the versioned host triple using the Swift compiler.
+    public static func getHostTriple(usingSwiftCompiler swiftCompiler: AbsolutePath) throws -> Triple {
+        // Call the compiler to get the target info JSON.
+        let compilerOutput: String
+        do {
+            let result = try Process.popen(args: swiftCompiler.pathString, "-print-target-info")
+            compilerOutput = try result.utf8Output().spm_chomp()
+        } catch {
+            throw InternalError("Failed to get target info (\(error.interpolationDescription))")
+        }
+        // Parse the compiler's JSON output.
+        let parsedTargetInfo: JSON
+        do {
+            parsedTargetInfo = try JSON(string: compilerOutput)
+        } catch {
+            throw InternalError(
+                "Failed to parse target info (\(error.interpolationDescription)).\nRaw compiler output: \(compilerOutput)"
+            )
+        }
+        // Get the triple string from the parsed JSON.
+        let tripleString: String
+        do {
+            tripleString = try parsedTargetInfo.get("target").get("triple")
+        } catch {
+            throw InternalError(
+                "Target info does not contain a triple string (\(error.interpolationDescription)).\nTarget info: \(parsedTargetInfo)"
+            )
+        }
+
+        // Parse the triple string.
+        do {
+            return try Triple(tripleString)
+        } catch {
+            throw InternalError(
+                "Failed to parse triple string (\(error.interpolationDescription)).\nTriple string: \(tripleString)"
+            )
+        }
+    }
+}
+
+extension Triple {
+    /// The file prefix for dynamic libraries
+    public var dynamicLibraryPrefix: String {
+        switch os {
+        case .win32:
+            return ""
+        default:
+            return "lib"
+        }
+    }
+
+    /// The file extension for dynamic libraries (eg. `.dll`, `.so`, or `.dylib`)
+    public var dynamicLibraryExtension: String {
+        guard let os = self.os else {
+            fatalError("Cannot create dynamic libraries unknown os.")
+        }
+
+        switch os {
+        case .darwin, .macosx:
+            return ".dylib"
+        case .linux, .openbsd:
+            return ".so"
+        case .win32:
+            return ".dll"
+        case .wasi:
+            return ".wasm"
+        default:
+            fatalError("Cannot create dynamic libraries for os \"\(os)\".")
+        }
+    }
+
+    public var executableExtension: String {
+        guard let os = self.os else {
+            return ""
+        }
+
+        switch os {
+        case .darwin, .macosx:
+            return ""
+        case .linux, .openbsd:
+            return ""
+        case .wasi:
+            return ".wasm"
+        case .win32:
+            return ".exe"
+        case .noneOS:
+            return ""
+        default:
+            return ""
+        }
+    }
+
+    /// The file extension for static libraries.
+    public var staticLibraryExtension: String {
+        ".a"
+    }
+
+    /// The file extension for Foundation-style bundle.
+    public var nsbundleExtension: String {
+        switch os {
+        case .darwin, .macosx:
+            return ".bundle"
+        default:
+            // See: https://github.com/apple/swift-corelibs-foundation/blob/master/Docs/FHS%20Bundles.md
+            return ".resources"
+        }
+    }
+}
+
+extension Triple: CustomStringConvertible {
+    public var description: String { tripleString }
+}
+
+extension Triple: Equatable {
+    public static func == (lhs: Self, rhs: Self) -> Bool {
+        lhs.triple == rhs.triple
+    }
+}