scratch/igc warning

[Andrea Corallo <acorallo@gnu.org>]

Hi,

GCC 12.3 is giving me this warning building scratch/igc:

========
  CC       xfaces.o
In file included from /usr/include/string.h:535,
                 from ../lib/string.h:41,
                 from lisp.h:29,
                 from xfaces.c:226:
In function ‘memset’,
    inlined from ‘make_realized_face’ at xfaces.c:4581:3,
    inlined from ‘realize_gui_face’ at xfaces.c:6214:10,
    inlined from ‘realize_face’ at xfaces.c:6124:12:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:59:10: warning: ‘__builtin_memset’ offset [164, 303] from the object at ‘face’ is out of the bounds of referenced subobject ‘id’ with type ‘int’ at offset 160 [-Warray-bounds]
   59 |   return __builtin___memset_chk (__dest, __ch, __len,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   60 |                                  __glibc_objsize0 (__dest));
      |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from termhooks.h:27,
                 from frame.h:22,
                 from xfaces.c:229:
dispextern.h: In function ‘realize_face’:
dispextern.h:1730:7: note: subobject ‘id’ declared here
 1730 |   int id;
      |       ^~
In function ‘memset’,
    inlined from ‘make_realized_face’ at xfaces.c:4581:3,
    inlined from ‘realize_tty_face’ at xfaces.c:6641:10,
    inlined from ‘realize_face’ at xfaces.c:6126:12:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:59:10: warning: ‘__builtin_memset’ offset [164, 303] from the object at ‘face’ is out of the bounds of referenced subobject ‘id’ with type ‘int’ at offset 160 [-Warray-bounds]
   59 |   return __builtin___memset_chk (__dest, __ch, __len,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   60 |                                  __glibc_objsize0 (__dest));
      |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~
dispextern.h: In function ‘realize_face’:
dispextern.h:1730:7: note: subobject ‘id’ declared here
 1730 |   int id;
      |       ^~
In function ‘memset’,
    inlined from ‘make_realized_face’ at xfaces.c:4581:3,
    inlined from ‘realize_face’ at xfaces.c:6130:14:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:59:10: warning: ‘__builtin_memset’ offset [164, 303] from the object at ‘face’ is out of the bounds of referenced subobject ‘id’ with type ‘int’ at offset 160 [-Warray-bounds]
   59 |   return __builtin___memset_chk (__dest, __ch, __len,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   60 |                                  __glibc_objsize0 (__dest));
      |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~
dispextern.h: In function ‘realize_face’:
dispextern.h:1730:7: note: subobject ‘id’ declared here
 1730 |   int id;
      |       ^~
========

ATM don't know if it's a real issue or a false positive so I thought was
worth mentioning.

  Andrea