diff --git a/toolchain/gcc/patches-11.x/980-libiberty-set_32 call.patch b/toolchain/gcc/patches-11.x/980-libiberty-set_32 call.patch
new file mode 100644
index 000000000..7489504c4
--- /dev/null
+++ b/toolchain/gcc/patches-11.x/980-libiberty-set_32 call.patch	
@@ -0,0 +1,33 @@
+From 38757aa88735ab2e511bc428e2407a5a5e9fa0be Mon Sep 17 00:00:00 2001
+From: Iain Sandoe <iain@sandoe.co.uk>
+Date: Mon, 23 Aug 2021 17:34:43 +0100
+Subject: [PATCH] libiberty, Darwin: Fix a build warning.
+
+r12-3005-g220c410162ebece4f missed a cast for the set_32 call.
+Fixed thus.
+
+Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
+
+libiberty/ChangeLog:
+
+	* simple-object-mach-o.c (simple_object_mach_o_write_segment):
+	Cast the first argument to set_32 as needed.
+---
+ libiberty/simple-object-mach-o.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libiberty/simple-object-mach-o.c b/libiberty/simple-object-mach-o.c
+index 72b69d19c216..a8869e7c6395 100644
+--- a/libiberty/simple-object-mach-o.c
++++ b/libiberty/simple-object-mach-o.c
+@@ -1228,7 +1228,7 @@ simple_object_mach_o_write_segment (simple_object_write *sobj, int descriptor,
+       /* Swap the indices, if required.  */
+ 
+       for (i = 0; i < (nsects_in * 4); ++i)
+-	set_32 (&index[i], index[i]);
++	set_32 ((unsigned char *) &index[i], index[i]);
+ 
+       sechdr_offset += sechdrsize;
+ 
+-- 
+2.43.5