[Bug gdb/20287] X32 and "gdb_static_assert (sizeof (nat_siginfo_t) == sizeof (siginfo_t))"

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

https://sourceware.org/bugzilla/show_bug.cgi?id=20287

--- Comment #23 from Jeffrey Walton <noloader at gmail dot com> ---
(In reply to Walfred Tedeschi from comment #22)
> In the Kernel sources we have:
> 
>   1 #ifndef _ASM_X86_SIGINFO_H
>   2 #define _ASM_X86_SIGINFO_H
>   3 
>   4 #ifdef __x86_64__
>   5 # ifdef __ILP32__ /* x32 */
>   6 typedef long long __kernel_si_clock_t __attribute__((aligned(4)));
>   7 #  define __ARCH_SI_CLOCK_T             __kernel_si_clock_t
>   8 #  define __ARCH_SI_ATTRIBUTES          __attribute__((aligned(8)))
>   9 # else /* x86-64 */
>  10 #  define __ARCH_SI_PREAMBLE_SIZE       (4 * sizeof(int))
>  11 # endif
>  12 #endif
>  13 
>  14 #include <asm-generic/siginfo.h>
>  15 
>  16 #endif /* _ASM_X86_SIGINFO_H */
> 
> http://lxr.free-electrons.com/source/arch/x86/include/uapi/asm/siginfo.h
> 
> So for fix we could set the _pad conditionally as the glic does.

I've got a fresh directory ready to test this. Where would you like it?

Grep is turning up 0 hits:

  # grep -R '_ASM_X86_SIGINFO_H' *
  # grep -R '__ARCH_SI_ATTRIBUTES' *
  # debian-8-x32-vm:gdb-7.11#

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