[CAS] Add a callback version of the makeGlobal API

Provide a callback version of the makeGlobal API for uploading build
artifacts on top of the async verison.

Author: cachemeifyoucan

Sources/SwiftDriver/SwiftScan/SwiftScanCAS.swift

@@ -37,6 +37,36 @@ public final class CachedCompilation {
     lib.api.swiftscan_cached_compilation_is_uncacheable(ptr)
   }
 
+  public func makeGlobal(_ callback: @escaping (Swift.Error?) -> ()) {
+    class CallbackContext {
+      func retain() -> UnsafeMutableRawPointer {
+        return Unmanaged.passRetained(self).toOpaque()
+      }
+
+      let comp: CachedCompilation
+      let callback: (Swift.Error?) -> ()
+      init(_ compilation: CachedCompilation, _ callback: @escaping (Swift.Error?) -> ()) {
+        self.comp = compilation
+        self.callback = callback
+      }
+    }
+
+    func callbackFunc(_ context: UnsafeMutableRawPointer?, _ error: swiftscan_string_ref_t) {
+      let obj = Unmanaged<CallbackContext>.fromOpaque(context!).takeRetainedValue()
+      if error.length != 0 {
+        if let err = try? obj.comp.lib.toSwiftString(error) {
+          obj.callback(DependencyScanningError.casError(err))
+        } else {
+          obj.callback(DependencyScanningError.casError("unknown makeGlobal error"))
+        }
+      }
+      obj.callback(nil)
+    }
+
+    let context = CallbackContext(self, callback)
+    lib.api.swiftscan_cached_compilation_make_global_async(ptr, context.retain(), callbackFunc, nil)
+  }
+
   deinit {
     lib.api.swiftscan_cached_compilation_dispose(ptr)
   }