From 4b4a6991e382baea3a82d26537ddabfeadfa4dad Mon Sep 17 00:00:00 2001
From: Andrew Kaster <andrew@ladybird.org>
Date: Sun, 17 Nov 2024 15:29:25 -0700
Subject: [PATCH] Tests: Use ABI entry point for swift-testing tests

Avoid the unstable SwiftPM entry point in favor of the stable ABI entry
point.
---
 Meta/CMake/Swift/swift-settings.cmake |  2 ++
 Tests/Resources/SwiftTestMain.swift   | 21 ++++++++++++++++-----
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/Meta/CMake/Swift/swift-settings.cmake b/Meta/CMake/Swift/swift-settings.cmake
index d724aa53fad..e658e4bfbcb 100644
--- a/Meta/CMake/Swift/swift-settings.cmake
+++ b/Meta/CMake/Swift/swift-settings.cmake
@@ -21,6 +21,8 @@ if (APPLE)
     set(CMAKE_Swift_COMPILER_TARGET "${SWIFT_TARGET_TRIPLE}")
 endif()
 
+add_compile_options("SHELL:$<$<COMPILE_LANGUAGE:Swift>:-enable-experimental-feature Extern>")
+
 set(VFS_OVERLAY_DIRECTORY "${CMAKE_BINARY_DIR}/vfs_overlays" CACHE PATH "Directory to put VFS overlays in")
 
 # FIXME: https://gitlab.kitware.com/cmake/cmake/-/issues/26195
diff --git a/Tests/Resources/SwiftTestMain.swift b/Tests/Resources/SwiftTestMain.swift
index d2b3c19609c..784d4c19b9c 100644
--- a/Tests/Resources/SwiftTestMain.swift
+++ b/Tests/Resources/SwiftTestMain.swift
@@ -4,13 +4,24 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-// FIXME: This file is intended to become redundant as swift-testing stabilizes
-//        See https://github.com/swiftlang/swift-testing/blob/133e30231c4583b02ab3ea2a7f678f3d7f4f8a3d/Documentation/CMake.md#add-an-entry-point
+import Foundation
 
-import Testing
+typealias EntryPoint = @convention(thin) @Sendable (_ configurationJSON: UnsafeRawBufferPointer?, _ recordHandler: @escaping @Sendable (_ recordJSON: UnsafeRawBufferPointer) -> Void) async throws -> Bool
+
+@_extern(c, "swt_abiv0_getEntryPoint")
+func swt_abiv0_getEntryPoint() -> UnsafeRawPointer
 
 @main struct Runner {
-    static func main() async {
-        await Testing.__swiftPMEntryPoint() as Never
+    static func main() async throws {
+        let configurationJSON: UnsafeRawBufferPointer? = nil
+        let recordHandler: @Sendable (UnsafeRawBufferPointer) -> Void = { _ in }
+
+        let entryPoint = unsafeBitCast(swt_abiv0_getEntryPoint(), to: EntryPoint.self)
+
+        if try await entryPoint(configurationJSON, recordHandler) {
+            exit(EXIT_SUCCESS)
+        } else {
+            exit(EXIT_FAILURE)
+        }
     }
 }