[Bug symtab/29318] [gdb] FAIL: gdb.base/gcore-relro-pie.exp: x/i $pc

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29318

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> That seems to be caused by this alignment mismatch introduced by strip:
> ...
> $ readelf -l -W  gcore-relro-pie | grep GNU_ST
>   GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000
> 0x000000 RW  0x10
> $ readelf -l -W  gcore-relro-pie.stripped | grep GNU_ST
>   GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000
> 0x000000 RW  0x8
> ...
> 
> I have not been able to reproduce this outside the specific setup, so the
> strip problem may be specific to the package.
> 

I was able to reproduce this with binutils trunk from today, using
--disable-separate-code, which has an effect here in bfd/elf64-x86-64.c:
...
#if DEFAULT_LD_Z_SEPARATE_CODE
# define ELF_MAXPAGESIZE                    0x1000
#else
# define ELF_MAXPAGESIZE                    0x200000
#endif
...
which causes elf_is_p_align_valid to behave differently, which is called from
copy_elf_program_header.

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