[PATCH v2 2/8] jfs: disable gcc9 -Waddress-of-packed-member

[Michael Chang]

Disable the -Wadress-of-packaed-member diagnostic for the
grub_jfs_getent function since the result is found to be false postive.

The leaf is read into memory as continous chunks in size of 32 bytes and
the pointer to its base is aligned, which also guarentee its member
leaf->namepart is aligned.

[   60s] ../grub-core/fs/jfs.c: In function 'grub_jfs_getent':
[   60s] ../grub-core/fs/jfs.c:557:44: error: taking address of packed member 
of 'struct grub_jfs_leaf_dirent' may result in an unaligned pointer value 
[-Werror=address-of-packed-member]
[   60s]   557 |   le_to_cpu16_copy (filename + strpos, leaf->namepart, len < 
diro->data->namecomponentlen ? len
[   60s]       |                                        ~~~~^~~~~~~~~~
[   60s] ../grub-core/fs/jfs.c:570:48: error: taking address of packed member 
of 'struct grub_jfs_leaf_next_dirent' may result in an unaligned pointer value 
[-Werror=address-of-packed-member]
[   60s]   570 |  le_to_cpu16_copy (filename + strpos, next_leaf->namepart, len 
< 15 ? len : 15);
[   60s]       |                                       ~~~~~~~~~^~~~~~~~~~
[   60s] cc1: all warnings being treated as errors

Signed-off-by: Michael Chang <address@hidden>
---
 grub-core/fs/jfs.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/grub-core/fs/jfs.c b/grub-core/fs/jfs.c
index 09bc5608d..d5a6d6527 100644
--- a/grub-core/fs/jfs.c
+++ b/grub-core/fs/jfs.c
@@ -505,6 +505,10 @@ le_to_cpu16_copy (grub_uint16_t *out, grub_uint16_t *in, 
grub_size_t len)
     *out++ = grub_le_to_cpu16 (*in++);
 }
 
+#if __GNUC__ >= 9
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
+#endif
 
 /* Read in the next dirent from the directory described by DIRO.  */
 static grub_err_t
@@ -582,6 +586,9 @@ grub_jfs_getent (struct grub_jfs_diropen *diro)
   return 0;
 }
 
+#if __GNUC__ >= 9
+#pragma GCC diagnostic pop
+#endif
 
 /* Read LEN bytes from the file described by DATA starting with byte
    POS.  Return the amount of read bytes in READ.  */
-- 
2.16.4