[Bug testsuite/14531] gdb.base/dprintf.exp fails in newlib environment

["palves at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14531

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |palves at redhat dot com

--- Comment #2 from Pedro Alves <palves at redhat dot com> 2012-09-10 13:27:13 UTC ---
How about adding a function like 

 FILE *get_stderr () { return stderr; }

to the test's .c file, and do 

  set dprintf-function fprintf
  set dprintf-channel get_stderr()

instead of 

  set dprintf-function fprintf
  set dprintf-channel stderr

IOW, avoid the need of macro debug info for all targets.

AFAICS, the code does:

  else if (strcmp (dprintf_style, dprintf_style_call) == 0)
    {
      if (!dprintf_function)
        error (_("No function supplied for dprintf call"));

      if (dprintf_channel && strlen (dprintf_channel) > 0)
        printf_line = xstrprintf ("call (void) %s (%s,%s)",
                                  dprintf_function,
                                  dprintf_channel,
                                  dprintf_args);
      else
        printf_line = xstrprintf ("call (void) %s (%s)",
                                  dprintf_function,
                                  dprintf_args);
    }

So that'll expand to one infcall to

  fprintf (get_stderr (), ...)

instead of:

  fprintf (stderr, ...)

Which is the same thing -- still one infcall.

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