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Backport of swiftlang/swift-corelibs-libdispatch commit d545f73a3986 ("Fix unused-but-set-global
error"), which is not yet in the tpoechtrager/apple-libdispatch fork we build. Clang 23 rejects the
Linux build with -Werror,-Wunused-but-set-global because this global is only read under
diff --git a/src/queue.c b/src/queue.c
--- a/src/queue.c
+++ b/src/queue.c
@@ -6546,7 +6546,9 @@ _dispatch_pthread_root_queue_dispose(dispatch_queue_global_t dq,
#pragma mark -
#pragma mark dispatch_runloop_queue
+#ifndef __linux__
DISPATCH_STATIC_GLOBAL(bool _dispatch_program_is_probably_callback_driven);
+#endif
#if DISPATCH_COCOA_COMPAT
DISPATCH_STATIC_GLOBAL(dispatch_once_t _dispatch_main_q_handle_pred);
@@ -6680,7 +6682,9 @@ _dispatch_runloop_queue_handle_init(void *ctxt)
#endif
_dispatch_runloop_queue_set_handle(dq, handle);
+#ifndef __linux__
_dispatch_program_is_probably_callback_driven = true;
+#endif
}
static void
@@ -7148,7 +7152,9 @@ dispatch_main(void)
if (pthread_main_np()) {
#endif
_dispatch_object_debug(&_dispatch_main_q, "%s", __func__);
+#ifndef __linux__
_dispatch_program_is_probably_callback_driven = true;
+#endif
_dispatch_ktrace0(ARIADNE_ENTER_DISPATCH_MAIN_CODE);
#ifdef __linux__
// On Linux, if the main thread calls pthread_exit, the process becomes a zombie.