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Date: Fri, 20 May 2016 23:36:59 +1000
From: Duncan Roe <duncan_roe AT acslink DOT net DOT au>
To: cygwin AT cygwin DOT com
Subject: Re: Help debugging a dll issue
Message-ID: <20160520133659.GD12938@dimstar.local.net>
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On Fri, May 20, 2016 at 08:02:20AM -0400, Eliot Moss wrote:
> On 5/20/2016 7:26 AM, Duncan Roe wrote:
>
> >Hi Eliot,
> >
> >Do you know what is the name of the totally different symbol? (maybe from nm -D)
>
> Yes -- I have been using nm and objdump to examine the relevant files.  The dll
> is called libpypy-c.dll.  The symbol I want to bind to is pypy_main_startup, and
> its proper value (as returned by nm and objdump) is 0x6410ac60.  The result I
> get is the value of symbol pypy_g_PyNumber_Negative (an automatically generated
> C function), which is 0x63443f00.
>
> I wonder if these collide in some internal hash table and the hash lookup (or
> the table building) is broken in some subtle way.
>
> Regards -- Eliot
>
Does findit give the same answer for both symbols?

If you could build your library and libdl.a with debug (-g) then you might be
able to see how the lookup goes wrong.

HTH ... Duncan.

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