Re: Support of gdb for Windows 64 native systems

[Christopher Faylor <cgf-use-the-mailinglist-please@sourceware.org>]

On Sun, Oct 14, 2007 at 07:02:26PM +0100, Pedro Alves wrote:
> Christopher Faylor wrote:
>>> +  flags = DEBUG_ONLY_THIS_PROCESS;
>>> +  toexec = exec_file;
>> This doesn't seem right.  You moved this setting outside of an if block
>> and didn't accommodate the else condition.
>
> I didn't move it.  The if inside the __CYGWIN__ block sets TOEXEC in both
> branches.

I'm talking about "flags".

> Here is rest of the hunk:
>>> +
>>> +#ifdef __CYGWIN__
>>>   if (!useshell)
>>>     {
>>> -      flags = DEBUG_ONLY_THIS_PROCESS;
>>>       cygwin_conv_to_win32_path (exec_file, real_path);
>>>       toexec = real_path;
>>>     }
>>> @@ -1784,6 +1798,7 @@ win32_create_inferior (char *exec_file,
>>>       toexec = shell;
>>>       flags = DEBUG_PROCESS;
>>>     }
>>> +#endif
>
> This is what the resulting code looks like after the patch is applied:
>
>   flags = DEBUG_ONLY_THIS_PROCESS;
>   toexec = exec_file;
>
> #ifdef __CYGWIN__
>   if (!useshell)
>     {
>       cygwin_conv_to_win32_path (exec_file, real_path);
>       toexec = real_path;
>     }
>   else
>     {
>       char *newallargs;
>       sh = getenv ("SHELL");
>       if (!sh)
> 	sh = "/bin/sh";
>       cygwin_conv_to_win32_path (sh, shell);
>       newallargs = alloca (sizeof (" -c 'exec  '") + strlen (exec_file)
> 			   + strlen (allargs) + 2);
>       sprintf (newallargs, " -c 'exec %s %s'", exec_file, allargs);
>       allargs = newallargs;
>       toexec = shell;
>       flags = DEBUG_PROCESS;
>     }
> #endif
>
> It could be changed into:
>
> #ifdef __CYGWIN__
> ...
> #else
>   toexec = exec_file;
> #endif
>
> I prefer how it is now, but I'll respect your decision.
>
>>> +#ifdef __CYGWIN__
>>>   add_setshow_boolean_cmd ("shell", class_support, &useshell, _("\
>>> Set use of shell to start subprocess."), _("\
>>> Show use of shell to start subprocess."), NULL,
>>> 			   NULL,
>>> 			   NULL, /* FIXME: i18n: */
>>> 			   &setlist, &showlist);
>>> +#endif
>>>
>>>   add_setshow_boolean_cmd ("cygwin-exceptions", class_support, 
>>> &cygwin_exceptions, _("\
>>> Break when an exception is detected in the Cygwin DLL itself."), _("\
>> Seems like the above should be ifdef'ed too.
>
> Not sure why.  The cygwin1.dll dll detection doesn't depend on any host
> habilities.  Having a mingw hosted gdb be able to attach to a cygwin
> executable, and being able to debug it, seems useful.  I imagine that
> it might prove useful to have a gdb that doesn't link to cygwin1.dll
> as a resort into debugging Cygwin issues.

There should be no cygwin accommodations in a pure windows port of gdb.

cgf