Silence signedness change through implicit conversion error

AnthonyLatsis · AnthonyLatsis · commit 38872e2d44d6 · 2025-06-13T19:02:43.000+01:00
The error pops up when using the rebranch Clang (stable/20250402):

```
/home/build-user/swift-corelibs-libdispatch/src/event/event_epoll.c:92:27: error: implicit conversion changes signedness: 'int' to 'uint32_t' (aka 'unsigned int') [-Werror,-Wsign-conversion]
92 |         return dmn-&gt;dmn_events &amp; ~dmn-&gt;dmn_disarmed_events;
   |                                ~ ^~~~~~~~~~~~~~~~~~~~~~~~~
```
diff --git a/src/event/event_epoll.c b/src/event/event_epoll.c
@@ -89,7 +89,9 @@ DISPATCH_ALWAYS_INLINE
 static inline uint32_t
 _dispatch_muxnote_armed_events(dispatch_muxnote_t dmn)
 {
-	return dmn->dmn_events & ~dmn->dmn_disarmed_events;
+  uint32_t events = dmn->dmn_events;
+  uint16_t disarmed_events = dmn->dmn_disarmed_events;
+  return events & ~(uint32_t)disarmed_events;
 }
 
 DISPATCH_ALWAYS_INLINE

Original file line number	Diff line number	Diff line change
`@@ -89,7 +89,9 @@ DISPATCH_ALWAYS_INLINE`
`89`	`89`	`static inline uint32_t`
`90`	`90`	`_dispatch_muxnote_armed_events(dispatch_muxnote_t dmn)`
`91`	`91`	`{`
`92`		`- return dmn->dmn_events & ~dmn->dmn_disarmed_events;`
	`92`	`+ uint32_t events = dmn->dmn_events;`
	`93`	`+ uint16_t disarmed_events = dmn->dmn_disarmed_events;`
	`94`	`+ return events & ~(uint32_t)disarmed_events;`
`93`	`95`	`}`
`94`	`96`
`95`	`97`	`DISPATCH_ALWAYS_INLINE`