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Date:   Thu, 16 Aug 2018 10:44:56 +0300 (EEST)
From:   Meelis Roos <mroos@linux.ee>
To:     linux-powerpc@vger.kernel.org,
        Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: ptrace compile failure with gcc-8.2 on 32-bit powerpc
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After upgrading my distro compiler to gcc-8.2, Linux fails to compile on 
32-bit powerpc (tested with 4.17, 4.18 and v4.18-7873-gf91e654474d4).


  CC      arch/powerpc/kernel/ptrace.o
In file included from ./include/linux/bitmap.h:9,
                 from ./include/linux/cpumask.h:12,
                 from ./include/linux/rcupdate.h:44,
                 from ./include/linux/rculist.h:11,
                 from ./include/linux/pid.h:5,
                 from ./include/linux/sched.h:14,
                 from arch/powerpc/kernel/ptrace.c:19:
In function ?memcpy?,
    inlined from ?user_regset_copyin? at ./include/linux/regset.h:295:4,
    inlined from ?vr_set? at arch/powerpc/kernel/ptrace.c:619:9:
./include/linux/string.h:345:9: error: ?__builtin_memcpy? offset [-527, -529] is out of the bounds [0, 16] of object ?vrsave? with type ?union <anonymous>? [-Werror=array-bounds]
  return __builtin_memcpy(p, q, size);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kernel/ptrace.c: In function ?vr_set?:
arch/powerpc/kernel/ptrace.c:614:5: note: ?vrsave? declared here
   } vrsave;
     ^~~~~~
In file included from ./include/linux/bitmap.h:9,
                 from ./include/linux/cpumask.h:12,
                 from ./include/linux/rcupdate.h:44,
                 from ./include/linux/rculist.h:11,
                 from ./include/linux/pid.h:5,
                 from ./include/linux/sched.h:14,
                 from arch/powerpc/kernel/ptrace.c:19:
In function ?memcpy?,
    inlined from ?user_regset_copyout? at ./include/linux/regset.h:270:4,
    inlined from ?vr_get? at arch/powerpc/kernel/ptrace.c:572:9:
./include/linux/string.h:345:9: error: ?__builtin_memcpy? offset [-527, -529] is out of the bounds [0, 16] of object ?vrsave? with type ?union <anonymous>? [-Werror=array-bounds]
  return __builtin_memcpy(p, q, size);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kernel/ptrace.c: In function ?vr_get?:
arch/powerpc/kernel/ptrace.c:567:5: note: ?vrsave? declared here
   } vrsave;
     ^~~~~~
cc1: all warnings being treated as errors
make[1]: *** [scripts/Makefile.build:311: arch/powerpc/kernel/ptrace.o] Error 1


-- 
Meelis Roos (mroos@linux.ee)