From a92598b6ca01405e4cfcd4278fd4db5f72c24fc5 Mon Sep 17 00:00:00 2001
From: Stuart Montgomery <smontgomery@apple.com>
Date: Tue, 26 Nov 2024 11:41:26 -0600
Subject: [PATCH] Don't install the binary Swift module when building for Apple
 platforms

---
 cmake/modules/SwiftModuleInstallation.cmake | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/cmake/modules/SwiftModuleInstallation.cmake b/cmake/modules/SwiftModuleInstallation.cmake
index b291f1ff0..261284236 100644
--- a/cmake/modules/SwiftModuleInstallation.cmake
+++ b/cmake/modules/SwiftModuleInstallation.cmake
@@ -86,13 +86,17 @@ function(_swift_testing_install_target module)
   install(FILES $<TARGET_PROPERTY:${module},Swift_MODULE_DIRECTORY>/${module_name}.swiftdoc
     DESTINATION "${module_dir}"
     RENAME ${SwiftTesting_MODULE_TRIPLE}.swiftdoc)
-  install(FILES $<TARGET_PROPERTY:${module},Swift_MODULE_DIRECTORY>/${module_name}.swiftmodule
-    DESTINATION "${module_dir}"
-    RENAME ${SwiftTesting_MODULE_TRIPLE}.swiftmodule)
   if(APPLE)
     # Only Darwin has stable ABI. 
     install(FILES $<TARGET_PROPERTY:${module},Swift_MODULE_DIRECTORY>/${module_name}.swiftinterface
       DESTINATION "${module_dir}"
       RENAME ${SwiftTesting_MODULE_TRIPLE}.swiftinterface)
+  else()
+    # Only install the binary .swiftmodule on platforms which do not have a
+    # stable ABI. Other platforms will use the textual .swiftinterface
+    # (installed above) and this limits access to this module's SPIs.
+    install(FILES $<TARGET_PROPERTY:${module},Swift_MODULE_DIRECTORY>/${module_name}.swiftmodule
+      DESTINATION "${module_dir}"
+      RENAME ${SwiftTesting_MODULE_TRIPLE}.swiftmodule)
   endif()
 endfunction()