Added support for supplying an --xcconfig option that can be used to set project-wide build settings

Author: bok-

Diff for: Sources/CreateXCFramework/Command+Options.swift

@@ -30,6 +30,9 @@ extension Command {
 
         @Flag(help: "Prints the available products and targets")
         var listProducts: Bool
+
+        @Option(help: "The path to a .xcconfig file that can be used to override Xcode build settings. Relative to the package path.")
+        var xcconfig: String?
 
 
         // MARK: - Output Options

Diff for: Sources/CreateXCFramework/Command.swift

@@ -50,7 +50,7 @@ struct Command: ParsableCommand {
         let platforms = try package.supportedPlatforms()
 
         // get what we're building
-        try generator.writeXcconfig()
+        try generator.writeDistributionXcconfig()
         let project = try generator.generate()
 
         // printing packages?
@@ -65,9 +65,7 @@ struct Command: ParsableCommand {
 
         // we've applied the xcconfig to everything, but some dependencies (*cough* swift-nio)
         // have build errors, so we remove it from targets we're not building
-        for target in project.targets where productNames.contains(target.name) == false {
-            target.buildSettings.xcconfigFileRef = nil
-        }
+        try project.enableDistribution(targets: productNames, xcconfig: AbsolutePath(package.distributionBuildXcconfig.path).relative(to: AbsolutePath(package.rootDirectory.path)))
 
         // save the project
         try project.save(to: generator.projectPath)

Diff for: Sources/CreateXCFramework/PackageInfo.swift

@@ -32,7 +32,22 @@ struct PackageInfo {
             .appendingPathComponent("Distribution.xcconfig")
             .absoluteURL
     }
-    
+
+    var overridesXcconfig: Foundation.URL? {
+        guard let path = self.options.xcconfig else { return nil }
+
+        // absolute path
+        if path.hasPrefix("/") {
+            return Foundation.URL(fileURLWithPath: path)
+
+        // strip current directory if thats where we are
+        } else if path.hasPrefix("./") {
+            return self.rootDirectory.appendingPathComponent(String(path[path.index(path.startIndex, offsetBy: 2)...]))
+        }
+
+        return self.rootDirectory.appendingPathComponent(path)
+    }
+
     // TODO: Map diagnostics to swift-log
     let diagnostics = DiagnosticsEngine()
 

Diff for: Sources/CreateXCFramework/ProjectGenerator.swift

@@ -15,7 +15,8 @@ struct ProjectGenerator {
     private enum Constants {
         static let `extension` = "xcodeproj"
     }
-    
+
+
     // MARK: - Properties
 
     let package: PackageInfo
@@ -24,19 +25,32 @@ struct ProjectGenerator {
         let dir = AbsolutePath(self.package.projectBuildDirectory.path)
         return buildXcodeprojPath(outputDir: dir, projectName: self.package.package.name)
     }
-    
+
+
     // MARK: - Initialisation
 
     init (package: PackageInfo) {
         self.package = package
     }
-    
+
+
     // MARK: - Generation
 
     /// Writes out the Xcconfig file
-    func writeXcconfig () throws {
+    func writeDistributionXcconfig () throws {
         try makeDirectories(self.projectPath)
-        try open(AbsolutePath(self.package.distributionBuildXcconfig.path)) { stream in
+
+        let path = AbsolutePath(self.package.distributionBuildXcconfig.path)
+        try open(path) { stream in
+            if let absolutePath = self.package.overridesXcconfig?.path {
+                stream (
+                    """
+                    #include "\(AbsolutePath(absolutePath).relative(to: AbsolutePath(path.dirname)).pathString)"
+
+                    """
+                )
+            }
+
             stream (
                 """
                 BUILD_LIBRARY_FOR_DISTRIBUTION=YES
@@ -59,19 +73,44 @@ struct ProjectGenerator {
             graph: self.package.graph,
             extraDirs: [],
             extraFiles: [],
-            options: XcodeprojOptions(xcconfigOverrides: AbsolutePath(self.package.distributionBuildXcconfig.path)),
+            options: XcodeprojOptions(xcconfigOverrides: (self.package.overridesXcconfig?.path).flatMap { AbsolutePath($0) }),
             diagnostics: self.package.diagnostics
         )
 
         return project
     }
+
 }
 
 
 // MARK: - Saving Xcode Projects
 
 extension Xcode.Project {
 
+    /// This is the group that is normally created in Xcodeproj.xcodeProject() when you specify an xcconfigOverride
+    var configGroup: Xcode.Group {
+        let name = "Configs"
+
+        if let group = self.mainGroup.subitems.lazy.compactMap({ $0 as? Xcode.Group }).first(where: { $0.name == name }) {
+            return group
+        }
+
+        // doesn't exist - lets creat it
+        return self.mainGroup.addGroup(path: "", name: name)
+    }
+
+    func enableDistribution (targets: [String], xcconfig: RelativePath) throws {
+        let group = self.configGroup
+        let ref = group.addFileReference (
+            path: xcconfig.pathString,
+            name: xcconfig.basename
+        )
+
+        for target in self.targets where targets.contains(target.name) {
+            target.buildSettings.xcconfigFileRef = ref
+        }
+    }
+
     func save (to path: AbsolutePath) throws {
         try open(path.appending(component: "project.pbxproj")) { stream in
             // Serialize the project model we created to a plist, and return

Diff for: action.js

@@ -15,6 +15,7 @@ async function run () {
         let targets = core.getInput('target', { required: false })
         let configuration = core.getInput('configuration', { required: false })
         let platforms = core.getInput('platforms', { required: false })
+        let xcconfig = core.getInput('xcconfig', { required: false })
 
         // install mint if its not installed
         await installUsingBrewIfRequired("mint")
@@ -34,6 +35,11 @@ async function run () {
             options.push(configuration)
         }
 
+        if (!!xcconfig) {
+            options.push('--xcconfig')
+            options.push(xcconfig)
+        }
+
         if (!!platforms) {
             platforms
                 .split(',')

Diff for: action.yml

@@ -12,6 +12,9 @@ inputs:
     description: "Build with a specific configuration ('debug' or 'release')"
     required: false
     default: release
+  xcconfig:
+    description: "The path to a .xcconfig file that can be used to override Xcode build settings. Relative to the package path."
+    required: false
 
 runs:
   using: node12