[PATCH v2 1/8] cpio: disable gcc9 -Waddress-of-packed-member

[Michael Chang]

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 <address@hidden>
---
 grub-core/fs/cpio_common.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/grub-core/fs/cpio_common.c b/grub-core/fs/cpio_common.c
index ed134d931..4e885d623 100644
--- a/grub-core/fs/cpio_common.c
+++ b/grub-core/fs/cpio_common.c
@@ -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)
 {
-- 
2.16.4