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libdm: fix dm_list pointer arithmentic for new gcc 10 optimization

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This commit is contained in:
Zdenek Kabelac 2020-03-04 16:07:22 +01:00
parent 2e3791b421
commit 8f3d2d5e11
1 changed files with 3 additions and 2 deletions
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5
libdm/libdevmapper.h
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@ -30,6 +30,7 @@
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h> /* offsetof */
#ifndef __GNUC__
# define __typeof__ typeof
@ -2470,7 +2471,7 @@ struct dm_list *dm_list_next(const struct dm_list *head, const struct dm_list *e
* contained in a structure of type t, return the containing structure.
*/
#define dm_list_struct_base(v, t, head) \
((t *)((const char *)(v) - (const char *)&((t *) 0)->head))
((t *)((const char *)(v) - offsetof(t, head)))
/*
* Given the address v of an instance of 'struct dm_list list' contained in
@ -2483,7 +2484,7 @@ struct dm_list *dm_list_next(const struct dm_list *head, const struct dm_list *e
* return another element f.
*/
#define dm_struct_field(v, t, e, f) \
(((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->e))->f)
(((t *)((uintptr_t)(v) - offsetof(t, e))->f)
/*
* Given the address v of a known element e in a known structure of type t,