Allow static linking of the SwiftPMDataModel target

Author: MaxDesiatov

Package.swift

@@ -23,85 +23,81 @@ if let deploymentTarget = ProcessInfo.processInfo.environment["SWIFTPM_MACOS_DEP
     macOSPlatform = .macOS(.v10_15)
 }
 
+/** A list of products which have two versions listed: one dynamically linked, the other with the
+automatic linking type with `-auto` suffix appended to product's name.
+*/
+let autoProducts = [
+    // The `libSwiftPM` set of interfaces to programatically work with Swift
+    // packages.  `libSwiftPM` includes all of the SwiftPM code except the
+    // command line tools, while `libSwiftPMDataModel` includes only the data model.
+    //
+    // NOTE: This API is *unstable* and may change at any time.
+    (
+        name: "SwiftPM",
+        targets: [
+            "SourceControl",
+            "SPMLLBuild",
+            "PackageCollections",
+            "PackageCollectionsModel",
+            "LLBuildManifest",
+            "PackageModel",
+            "PackageLoading",
+            "PackageGraph",
+            "Build",
+            "Xcodeproj",
+            "Workspace"
+        ]
+    ),
+    (
+        name: "SwiftPMDataModel",
+        targets: [
+            "SourceControl",
+            "PackageCollections",
+            "PackageCollectionsModel",
+            "PackageModel",
+            "PackageLoading",
+            "PackageGraph",
+            "Xcodeproj",
+            "Workspace"
+        ]
+    )
+]
+
 let package = Package(
     name: "SwiftPM",
     platforms: [macOSPlatform],
-    products: [
-        // The `libSwiftPM` set of interfaces to programatically work with Swift
-        // packages.  `libSwiftPM` includes all of the SwiftPM code except the
-        // command line tools, while `libSwiftPMDataModel` includes only the data model.
-        //
-        // NOTE: This API is *unstable* and may change at any time.
-        .library(
-            name: "SwiftPM",
-            type: .dynamic,
-            targets: [
-                "SourceControl",
-                "SPMLLBuild",
-                "PackageCollections",
-                "PackageCollectionsModel",
-                "LLBuildManifest",
-                "PackageModel",
-                "PackageLoading",
-                "PackageGraph",
-                "Build",
-                "Xcodeproj",
-                "Workspace"
-            ]
-        ),
-        .library(
-            name: "SwiftPM-auto",
-            targets: [
-                "SourceControl",
-                "SPMLLBuild",
-                "LLBuildManifest",
-                "PackageCollections",
-                "PackageCollectionsModel",
-                "PackageModel",
-                "PackageLoading",
-                "PackageGraph",
-                "Build",
-                "Xcodeproj",
-                "Workspace"
-            ]
-        ),
-        .library(
-            name: "SwiftPMDataModel",
-            type: .dynamic,
-            targets: [
-                "SourceControl",
-                "PackageCollections",
-                "PackageCollectionsModel",
-                "PackageModel",
-                "PackageLoading",
-                "PackageGraph",
-                "Xcodeproj",
-                "Workspace"
-            ]
-        ),
-
+    products:
+        autoProducts.flatMap {
+          [
+            .library(
+                name: $0.name,
+                type: .dynamic,
+                targets: $0.targets
+            ),
+            .library(
+                name: "\($0.name)-auto",
+                targets: $0.targets
+            )
+          ] as [Product]
+        } + [
         .library(
             name: "XCBuildSupport",
             targets: ["XCBuildSupport"]
         ),
-
         .library(
             name: "PackageDescription",
             type: .dynamic,
             targets: ["PackageDescription"]
         ),
-        
         .library(
             name: "PackagePlugin",
             type: .dynamic,
             targets: ["PackagePlugin"]
         ),
-        
         .library(
             name: "PackageCollectionsModel",
             targets: ["PackageCollectionsModel"]
         ),
-
         .library(
             name: "SwiftPMPackageCollections",
             targets: [
@@ -172,7 +168,7 @@ let package = Package(
             dependencies: ["SwiftToolsSupport-auto", "Basics", "PackageLoading", "PackageModel", "SourceControl"]),
 
         // MARK: Package Collections
-        
+
         .target(
             /** Package collections models */
             name: "PackageCollectionsModel",