Extract BuildConfiguration and BuildEnvironment into separate files

Author: mattt

Sources/PackageModel/BuildConfiguration.swift

@@ -0,0 +1,22 @@
+/*
+ This source file is part of the Swift.org open source project
+
+ Copyright (c) 2014 - 2020 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 Swift project authors
+*/
+
+/// The configuration of the build environment.
+public enum BuildConfiguration: String, CaseIterable, Codable {
+    case debug
+    case release
+
+    public var dirname: String {
+        switch self {
+            case .debug: return "debug"
+            case .release: return "release"
+        }
+    }
+}

Sources/PackageModel/BuildEnvironment.swift

@@ -0,0 +1,20 @@
+/*
+ This source file is part of the Swift.org open source project
+
+ Copyright (c) 2014 - 2020 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 Swift project authors
+*/
+
+/// A build environment with which to evaluation conditions.
+public struct BuildEnvironment: Codable {
+    public let platform: Platform
+    public let configuration: BuildConfiguration
+
+    public init(platform: Platform, configuration: BuildConfiguration) {
+        self.platform = platform
+        self.configuration = configuration
+    }
+}

Sources/PackageModel/CMakeLists.txt

@@ -7,6 +7,8 @@
 # See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 
 add_library(PackageModel
+  BuildConfiguration.swift
+  BuildEnvironment.swift
   BuildSettings.swift
   Diagnostics.swift
   Manifest.swift

Sources/PackageModel/Manifest.swift

@@ -958,30 +958,6 @@ public enum TargetBuildSettingDescription {
     }
 }
 
-/// The configuration of the build environment.
-public enum BuildConfiguration: String, CaseIterable, Codable {
-    case debug
-    case release
-
-    public var dirname: String {
-        switch self {
-            case .debug: return "debug"
-            case .release: return "release"
-        }
-    }
-}
-
-/// A build environment with which to evaluation conditions.
-public struct BuildEnvironment: Codable {
-    public let platform: Platform
-    public let configuration: BuildConfiguration
-
-    public init(platform: Platform, configuration: BuildConfiguration) {
-        self.platform = platform
-        self.configuration = configuration
-    }
-}
-
 /// A manifest condition.
 public protocol PackageConditionProtocol: Codable {
     func satisfies(_ environment: BuildEnvironment) -> Bool