From: cgf AT cygnus DOT com (Christopher Faylor)
Subject: Re: debugging cygwin DLL loaded by LoadLibrary??
28 Oct 1998 15:04:48 -0800
Message-ID: <19981028173648.A17873.cygnus.cygwin32.developers@cygnus.com>
References: <19981028145228 DOT A16302 AT cygnus DOT com>
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To: Mumit Khan <khan AT xraylith DOT wisc DOT edu>
Cc: cygwin32-developers AT cygnus DOT com

On Wed, Oct 28, 1998 at 04:26:12PM -0600, Mumit Khan wrote:
>Christopher Faylor <cgf AT cygnus DOT com> writes:
>> 
>> Don't know if this will work, but:
>> 
>>     gdb /wherever/cygwin1.dll
>>     exec-file prog
>>     b whatever
>>     r
>
>Nope. Actually, I don't think this is even meant to work because gdb has 
>no way of mapping the address of the symbol before the DLL is loaded. 
>
>Wonder if gdb should somehow load a DLL so that it's mapped and ready to
>be stepped into ... 
>
>Thanks for the suggestion though ... I've made do with small_printf in
>the meantime, but it makes for some very tedious debugging job.

One thing you could do that might work is to debug the program after it
has started running.  I have some patches to gdb which will allow attach
to work, and Sergey has a binary (which was independently developed) on
his web site.

If you insert a Sleep in something like dll_crt0_1 then quickly attach
to the running process, it's possible that the Windows debug API will
detect the fact that the cygwin DLL is loaded and "do the right thing".

-- 
cgf AT cygnus DOT com
http://www.cygnus.com/