X86: build failure

[Grygorii Strashko <grygorii_strashko@xxxxxxxx>]

Hi All,

I experience build failure with following Kconfig combination:
 CONFIG_DEBUG=n and CONFIG_XEN_IBT=n

with gcc:
 gcc --version
 gcc (Ubuntu 11.4.0-1ubuntu1~22.04.2) 11.4.0
 Copyright (C) 2021 Free Software Foundation, Inc.
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Is this known issue?

====== log ===============
  CC      arch/x86/x86_emulate.o
In file included from arch/x86/x86_emulate.c:27:
arch/x86/x86_emulate/x86_emulate.c: In function ‘x86_emulate’:
arch/x86/x86_emulate/x86_emulate.c:70:36: error: writing 1 byte into a region 
of size 0 [-Werror=stringop-overflow=]
   70 |     gcc11_wrap(ptr)[0 - PFX_BYTES] = ext < ext_8f08 ? 0xc4 : 0x8f; \
arch/x86/x86_emulate/x86_emulate.c:78:9: note: in expansion of macro ‘copy_VEX’
   78 |         copy_VEX(ptr, vex); \
      |         ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:8140:13: note: in expansion of macro 
‘copy_REX_VEX’
 8140 |             copy_REX_VEX(opc, rex_prefix, vex);
      |             ^~~~~~~~~~~~
In file included from arch/x86/x86_emulate/x86_emulate.c:11,
                 from arch/x86/x86_emulate.c:27:
arch/x86/x86_emulate/private.h:691:17: note: at offset [0, 4095] into destination object of 
size [0, 9223372036854775807] allocated by ‘map_domain_page’
  691 |     (stb).ptr = map_domain_page(_mfn(this_cpu(stubs.mfn))) + \
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:60:21: note: in expansion of macro ‘get_stub’
   60 |     uint8_t *buf_ = get_stub(stub); \
      |                     ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:3354:15: note: in expansion of macro 
‘init_prefixes’
 3354 |         opc = init_prefixes(stub);
      |               ^~~~~~~~~~~~~
arch/x86/x86_emulate/private.h:691:17: note: at offset [1, 4096] into destination object of 
size [0, 9223372036854775807] allocated by ‘map_domain_page’
  691 |     (stb).ptr = map_domain_page(_mfn(this_cpu(stubs.mfn))) + \
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:94:21: note: in expansion of macro ‘get_stub’
   94 |     uint8_t *buf_ = get_stub(stub); \
      |                     ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:3402:15: note: in expansion of macro 
‘init_evex’
 3402 |         opc = init_evex(stub);
[...]


--
Best regards,
-grygorii