tree be016a0762da87a0a7099997acbd40d5c0cb4d0c
parent 68af8106a337b708a181662de42bddc36d5aec71
author Andy Shevchenko <andriy.shevchenko@linux.intel.com> 1575049679 +0200
committer Tom Rini <trini@konsulko.com> 1578683906 -0500

gcc-9: silence 'address-of-packed-member' warning

GCC 9.x starts complaining about potential misalignment of the pointer to
the array (in this case alignment=2) in the packed (alignment=1) structures.

Repeating Linus' Torvalds commit 6f303d60534c in the Linux kernel.

Original commit message:

  We already did this for clang, but now gcc has that warning too.
  Yes, yes, the address may be unaligned.  And that's kind of the point.

This in particular hides the warnings like

drivers/usb/gadget/composite.c:545:23: warning: taking address of packed member of ‘struct usb_string_descriptor’ may result in an unaligned pointer value [-Waddress-of-packed-member]
  545 |    collect_langs(sp, s->wData);

drivers/usb/gadget/composite.c:550:24: warning: taking address of packed member of ‘struct usb_string_descriptor’ may result in an unaligned pointer value [-Waddress-of-packed-member]
  550 |     collect_langs(sp, s->wData);

drivers/usb/gadget/composite.c:555:25: warning: taking address of packed member of ‘struct usb_string_descriptor’ may result in an unaligned pointer value [-Waddress-of-packed-member]
  555 |      collect_langs(sp, s->wData);

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>