subprojects/packagefiles/libnvme/0001-ccan-cast-pointers-to-void-in-fprintf-for-p-format.patch

From ed5851d00b0e7c28cff614b9ca88d9d328c2de3b Mon Sep 17 00:00:00 2001
From: Guangzong Chen <guangzong@google.com>
Date: Fri, 11 Sep 2026 21:11:02 +0000
Subject: [PATCH] ccan: cast pointers to void * in fprintf for %p format
 specifier

GCC 15 enables stricter format validation by default, triggering
-Werror=format= when passing non-void pointers (e.g. `const struct list_node *`)
to `%p`:

    ccan/ccan/list/list.c: In function 'corrupt':
    ccan/ccan/list/list.c:13:52: error: format '%p' expects argument of type 'void *', but argument 4 has type 'const struct list_node *' [-Werror=format=]
       13 |                         "%s: prev corrupt in node %p (%u) of %p\n",
          |                                                   ~^
          |                                                    |
          |                                                    void *
       14 |                         abortstr, node, count, head);
          |                                   ~~~~
          |                                   |
          |                                   const struct list_node *
    ccan/ccan/list/list.c:13:63: error: format '%p' expects argument of type 'void *', but argument 6 has type 'const struct list_node *' [-Werror=format=]
       13 |                         "%s: prev corrupt in node %p (%u) of %p\n",
          |                                                              ~^
          |                                                               |
          |                                                               void *
       14 |                         abortstr, node, count, head);
          |                                                ~~~~
          |                                                |
          |                                                const struct list_node *

Per ISO C standard (C99/C11 7.21.6.1), the `%p` conversion specifier
expects an argument of type `void *` or `const void *`. Explicitly cast
`node` and `head` to `(const void *)` to prevent build failures under
modern compiler toolchains with -Werror enabled.

Upstream-Status: Submitted [https://github.com/linux-nvme/libnvme/pull/1146]
Signed-off-by: Guangzong Chen <guangzong@google.com>
---
 ccan/ccan/list/list.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ccan/ccan/list/list.c b/ccan/ccan/list/list.c
index 2717fa3f..3916605c 100644
--- a/ccan/ccan/list/list.c
+++ b/ccan/ccan/list/list.c
@@ -11,7 +11,7 @@ static void *corrupt(const char *abortstr,
 	if (abortstr) {
 		fprintf(stderr,
 			"%s: prev corrupt in node %p (%u) of %p\n",
-			abortstr, node, count, head);
+			abortstr, (const void *)node, count, (const void *)head);
 		abort();
 	}
 	return NULL;
-- 
2.46.0