From: Thomas Weißschuh <thomas@t-8ch.de>
Date: Fri, 12 Jan 2024 06:51:39 +0000 (+0100)
Subject: include/c.h: handle members of const struct
X-Git-Tag: v2.40-rc1~51^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=24fce5a36c2cb126f3fc27b34ba368f94941c039;p=thirdparty%2Futil-linux.git

include/c.h: handle members of const struct

Trying to copy into a local const struct will lead to a compiler error.
By adding a "+ 0" to the argument of __typeof__() the type of the
resulting express will loose its constness.

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
---

diff --git a/include/c.h b/include/c.h
index 36eb2a9e7f..e353643fdd 100644
--- a/include/c.h
+++ b/include/c.h
@@ -215,7 +215,7 @@
 
 #define read_unaligned_member(p, m) __extension__ ({          \
 	size_t offset = offsetof(__typeof__(* p), m);         \
-	__typeof__(p->m) v;                                   \
+	__typeof__(p->m + 0) v;                               \
 	memcpy(&v, ((unsigned char *)p) + offset, sizeof(v)); \
 	v; })