[Bug win32/14529] Make gdb capable of JIT-debugging on W32

[LRN]

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On 11.09.2012 22:08, Pedro Alves wrote:
> On 08/31/2012 04:37 PM, LRN wrote:
>>>>>> @@ -1055,6 +1065,7 @@ Options:\n\n\ --dbx
>>>>>> DBX compatibility mode.\n\ --directory=DIR    Search for
>>>>>> source files in DIR.\n\ --epoch            Output
>>>>>> information used by epoch emacs-GDB interface.\n\ +
>>>>>> --event=EVENT      Signal the EVENT when attached to a
>>>>>> process. W32 only.\n\
>>>> 
>>>> And also this part.
>> They were, initially. However, gdb contribution documentation
>> said that gdb devs frown upon extra #ifdefs in files that are
>> not platform-specific. The code is mostly platform independent,
>> it's the two W32API functions that only work on W32 (and you can
>> write non-W32 equivalent, if you figure out how to make it work).
>> Thus, i removed extra #ifdefs in main.c and other files.
> 
> Please consider also cross builds.  IOW, a gdb hosted on Windows, 
> but that is built to target something else.  In that case, as is, 
> you will end up with the option compiled in.  But if you remove
> any mention that this is for Windows only, it'll be confusing.
OK, that means moving configure.ac patches from $host_os case
to...where? Should i just make a new
    case "${target}" in
	*cygwin*|*mingw*) default_w32_jitdbg=1
	;;
    esac
somewhere? Is it ${target}, or ${target_os}? What if there are
multiple targets (i've seen something like that in configure.ac)?

> I'd maybe go as far as renaming the option to --w32-jit-event or 
> --aedebug-event, or some such.
> 
I don't really care how it's named. Agree on something, and i'll
change the patch.
That said, w32-jit-event sounds closer to truth, since it's not
exclusive to AeDebug (as i have said, you can use it manually, if you
have your own exception handler that runs gdb).

> Alternatively, and perhaps it really is a better option, get rid of
> the --event option, but make this a real command, implemented in
> windows-nat.c, so that the user has better control of when to
> signal the event, like:
> 
> gdb -ex "foo" -ex "bar" -ex "attach PID" -ex "signal-aedebug-event
> FOO"
> 
That's an interesting option. Will require better documentation though
(i haven't realized that i can do that until now; shows how well i
know gdb :). And i'll need to test it to make sure that W32 is
actually capable of, say, replacing a quoted %ld...
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