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cpio: Disable gcc9 -Waddress-of-packed-member 

Disable the -Wadress-of-packaed-member diagnostic for the
grub_cpio_find_file function since the result is found to be false
postive. Any pointers to member of the 'struct head hd' is aligned even
if the structure is packed without paddings.

[   59s] In file included from ../grub-core/fs/cpio.c:51:
[   59s] ../grub-core/fs/cpio_common.c: In function 'grub_cpio_find_file':
[   59s] ../grub-core/fs/cpio_common.c:58:31: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]    58 |   data->size = read_number (hd.filesize, ARRAY_SIZE (hd.filesize));
[   59s]       |                             ~~^~~~~~~~~
[   59s] ../grub-core/fs/cpio_common.c:60:29: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]    60 |     *mtime = read_number (hd.mtime, ARRAY_SIZE (hd.mtime));
[   59s]       |                           ~~^~~~~~
[   59s] ../grub-core/fs/cpio_common.c:61:28: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]    61 |   modeval = read_number (hd.mode, ARRAY_SIZE (hd.mode));
[   59s]       |                          ~~^~~~~
[   59s] ../grub-core/fs/cpio_common.c:62:29: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]    62 |   namesize = read_number (hd.namesize, ARRAY_SIZE (hd.namesize));
[   59s]       |                           ~~^~~~~~~~~
[   59s] In file included from ../grub-core/fs/cpio_be.c:51:
[   59s] ../grub-core/fs/cpio_common.c: In function 'grub_cpio_find_file':
[   59s] ../grub-core/fs/cpio_common.c:58:31: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]    58 |   data->size = read_number (hd.filesize, ARRAY_SIZE (hd.filesize));
[   59s]       |                             ~~^~~~~~~~~
[   59s] ../grub-core/fs/cpio_common.c:60:29: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]    60 |     *mtime = read_number (hd.mtime, ARRAY_SIZE (hd.mtime));
[   59s]       |                           ~~^~~~~~
[   59s] ../grub-core/fs/cpio_common.c:61:28: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]    61 |   modeval = read_number (hd.mode, ARRAY_SIZE (hd.mode));
[   59s]       |                          ~~^~~~~
[   59s] ../grub-core/fs/cpio_common.c:62:29: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]    62 |   namesize = read_number (hd.namesize, ARRAY_SIZE (hd.namesize));
[   59s]       |                           ~~^~~~~~~~~

Signed-off-by: Michael Chang <mchang@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Michael Chang 2019-04-11 17:14:02 +08:00 committed by Daniel Kiper
parent bc58fded50
commit 7ea474c688
1 changed files with 9 additions and 0 deletions
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9
grub-core/fs/cpio_common.c
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@ -36,6 +36,11 @@ struct grub_archelp_data
grub_off_t size;
};
#if __GNUC__ >= 9
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
#endif
static grub_err_t
grub_cpio_find_file (struct grub_archelp_data *data, char **name,
grub_int32_t *mtime, grub_uint32_t *mode)
@ -96,6 +101,10 @@ grub_cpio_find_file (struct grub_archelp_data *data, char **name,
return GRUB_ERR_NONE;
}
#if __GNUC__ >= 9
#pragma GCC diagnostic pop
#endif
static char *
grub_cpio_get_link_target (struct grub_archelp_data *data)
{