diff --git swift-corelibs-libdispatch.orig/src/apply.c swift-corelibs-libdispatch/src/apply.c
index 9c7d60f..c682f95 100644
--- swift-corelibs-libdispatch.orig/src/apply.c
+++ swift-corelibs-libdispatch/src/apply.c
@@ -20,6 +20,9 @@
 
 #include "internal.h"
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-function-type-mismatch"
+
 typedef void (*dispatch_apply_function_t)(void *, size_t);
 static char const * const _dispatch_apply_key = "apply";
 
@@ -366,3 +369,5 @@ dispatch_apply(size_t iterations, dispatch_queue_t dq, void (^work)(size_t))
 			(dispatch_apply_function_t)_dispatch_Block_invoke(work));
 }
 #endif
+
+#pragma GCC diagnostic pop
diff --git swift-corelibs-libdispatch.orig/src/data.c swift-corelibs-libdispatch/src/data.c
index 0a3cb1a..81a483b 100644
--- swift-corelibs-libdispatch.orig/src/data.c
+++ swift-corelibs-libdispatch/src/data.c
@@ -20,6 +20,9 @@
 
 #include "internal.h"
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-function-type-mismatch"
+
 /*
  * Dispatch data objects are dispatch objects with standard retain/release
  * memory management. A dispatch data object either points to a number of other
@@ -738,3 +741,5 @@ retry:
 	return mep;
 }
 #endif // HAVE_MACH
+
+#pragma GCC diagnostic pop
diff --git swift-corelibs-libdispatch.orig/src/event/event_epoll.c swift-corelibs-libdispatch/src/event/event_epoll.c
index f31d13e..ac80dfd 100644
--- swift-corelibs-libdispatch.orig/src/event/event_epoll.c
+++ swift-corelibs-libdispatch/src/event/event_epoll.c
@@ -20,6 +20,9 @@
 
 
 #include "internal.h"
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wsign-conversion"
 #if DISPATCH_EVENT_BACKEND_EPOLL
 #include <linux/sockios.h>
 #include <sys/epoll.h>
@@ -724,3 +727,5 @@ _dispatch_event_loop_leave_immediate(uint64_t dq_state)
 }
 
 #endif // DISPATCH_EVENT_BACKEND_EPOLL
+
+#pragma GCC diagnostic pop