From 8d957c56b33241b8e93c27d7a698d8079b402285 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Thu, 19 Sep 2024 19:53:19 +0200
Subject: [PATCH] unix: work around arm-linux-gnueabihf-gcc bug  (#4565)

Both gcc 11 and 12 emit wrong code for a function call pointer in one
very specific context.

Fixes: https://github.com/libuv/libuv/issues/4532
---
 src/unix/fs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/unix/fs.c b/src/unix/fs.c
index 263d4bbc..239ecda1 100644
--- a/src/unix/fs.c
+++ b/src/unix/fs.c
@@ -487,7 +487,10 @@ static ssize_t uv__preadv_or_pwritev(int fd,
     atomic_store_explicit(cache, (uintptr_t) p, memory_order_relaxed);
   }
 
-  f = p;
+  /* Use memcpy instead of `f = p` to work around a compiler bug,
+   * see https://github.com/libuv/libuv/issues/4532
+   */
+  memcpy(&f, &p, sizeof(p));
   return f(fd, bufs, nbufs, off);
 }