[Bug build/25097] new -Warray-bounds with GCC 10

["msebor at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25097

--- Comment #1 from Martin Sebor <msebor at gmail dot com> ---
The GCC patch has just landed.  It issues the same warnings, except those in
libc-tls.c and rtld.c are reported under the new -Wzero-length-bounds option
designed to detect accesses to interior zero-length array elements that overlap
subsequent members but that are otherwise not known to be out of the bounds of
the referenced object (it it's known).  These issues are classified separately
from -Warray-bounds so they can be suppressed independently, for example while
code is being cleaned up.

libc-tls.c:209:30: warning: array subscript 1 is outside the bounds of an
interior zero-length array ‘struct dtv_slotinfo[0]’ [-Wzero-length-bounds]
  209 |   static_slotinfo.si.slotinfo[1].map = main_map;
In file included from ../sysdeps/x86/ldsodefs.h:64,
                 from ../sysdeps/gnu/ldsodefs.h:46,
                 from ../sysdeps/unix/sysv/linux/ldsodefs.h:25,
                 from libc-tls.c:21:
../sysdeps/generic/ldsodefs.h:423:7: note: while referencing ‘slotinfo’
  423 |     } slotinfo[0];
      |       ^~~~~~~~
rtld.c:1016:27: warning: array subscript ‘cnt’ is outside the bounds of an
interior zero-length array ‘struct auditstate[0]’ [-Wzero-length-bounds]
 1016 |    GL(dl_rtld_map).l_audit[cnt].cookie = (intptr_t) &GL(dl_rtld_map);
In file included from ../include/dlfcn.h:4,
                 from rtld.c:20:
../include/link.h:335:7: note: while referencing ‘l_audit’
  335 |     } l_audit[0];
      |       ^~~~~~~

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