[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 #3 from Jeffrey Walton <noloader at gmail dot com> ---
I can't find the definition for nat_siginfo_t in /usr/include or /usr/lib.

Here' the definition of siginfo_t in the X32 environment. It may (or may not)
be the same as x86_64. 

$ cat siginfo_t.txt 
typedef struct
  {
    int si_signo;               /* Signal number.  */
    int si_errno;               /* If non-zero, an errno value associated with
                                   this signal, as defined in <errno.h>.  */
    int si_code;                /* Signal code.  */

    union
      {
        int _pad[__SI_PAD_SIZE];

         /* kill().  */
        struct
          {
            __pid_t si_pid;     /* Sending process ID.  */
            __uid_t si_uid;     /* Real user ID of sending process.  */
          } _kill;

        /* POSIX.1b timers.  */
        struct
          {
            int si_tid;         /* Timer ID.  */
            int si_overrun;     /* Overrun count.  */
            sigval_t si_sigval; /* Signal value.  */
          } _timer;

        /* POSIX.1b signals.  */
        struct
          {
            __pid_t si_pid;     /* Sending process ID.  */
            __uid_t si_uid;     /* Real user ID of sending process.  */
            sigval_t si_sigval; /* Signal value.  */
          } _rt;

        /* SIGCHLD.  */
        struct
          {
            __pid_t si_pid;     /* Which child.  */
            __uid_t si_uid;     /* Real user ID of sending process.  */
            int si_status;      /* Exit value or signal.  */
            __sigchld_clock_t si_utime;
            __sigchld_clock_t si_stime;
          } _sigchld;

        /* SIGILL, SIGFPE, SIGSEGV, SIGBUS.  */
        struct
          {
            void *si_addr;      /* Faulting insn/memory ref.  */
            short int si_addr_lsb;      /* Valid LSB of the reported address. 
*/
            struct
              {
                void *_lower;
                void *_upper;
              } si_addr_bnd;
          } _sigfault;

        /* SIGPOLL.  */
        struct
          {
            long int si_band;   /* Band event for SIGPOLL.  */
            int si_fd;
          } _sigpoll;

        /* SIGSYS.  */
        struct
          {
            void *_call_addr;   /* Calling user insn.  */
            int _syscall;       /* Triggering system call number.  */
            unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
          } _sigsys;
      } _sifields;
  } siginfo_t __SI_ALIGNMENT;

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