[PATCH v2 6/8] usbtest: disable gcc9 -Waddress-of-packed-member

[Michael Chang]

Disable the -Wadress-of-packaed-member diagnostic for the
grub_usb_get_string function since the result is false postive. The
descstrp->str is found to be aligned in the buffer allocated for 'struct
grub_usb_desc_str'.

[  229s] ../../grub-core/commands/usbtest.c: In function 'grub_usb_get_string':
[  229s] ../../grub-core/commands/usbtest.c:104:58: error: taking address of 
packed member of 'struct grub_usb_desc_str' may result in an unaligned pointer 
value [-Werror=address-of-packed-member]
[  229s]   104 |   *grub_utf16_to_utf8 ((grub_uint8_t *) *string, descstrp->str,
[  229s]       |                                                  ~~~~~~~~^~~~~

Signed-off-by: Michael Chang <address@hidden>
---
 grub-core/commands/usbtest.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/grub-core/commands/usbtest.c b/grub-core/commands/usbtest.c
index 01cdca934..2c6d93fe6 100644
--- a/grub-core/commands/usbtest.c
+++ b/grub-core/commands/usbtest.c
@@ -63,6 +63,11 @@ static const char *usb_devspeed[] =
     "High"
   };
 
+#if __GNUC__ >= 9
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
+#endif
+
 static grub_usb_err_t
 grub_usb_get_string (grub_usb_device_t dev, grub_uint8_t index, int langid,
                     char **string)
@@ -108,6 +113,10 @@ grub_usb_get_string (grub_usb_device_t dev, grub_uint8_t 
index, int langid,
   return GRUB_USB_ERR_NONE;
 }
 
+#if __GNUC__ >= 9
+#pragma GCC diagnostic pop
+#endif
+
 static void
 usb_print_str (const char *description, grub_usb_device_t dev, int idx)
 {
-- 
2.16.4