From: Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
Subject: Re: Linking an Ada DLL with MSVC++
Date: 10 Oct 2002 16:50:31 -0400
Date: 2002-10-10T21:01:17+00:00 [thread overview]
Message-ID: <u1y6yqaqw.fsf@gsfc.nasa.gov> (raw)
In-Reply-To: 254c16a.0210101206.34540dda@posting.google.com
mcq95@earthlink.net (Marc A. Criley) writes:
> I've meticulously followed the instructions in the GNAT User Manual
> for building a DLL, along with a Microsoft-style import library (i.e.,
> the .lib and .exp files).
>
> <snip>
>
> procedure Initialize_Vmf_API;
> pragma Export(C, Initialize_VMF_API, "Initialize_VMF_API");
>
> The header file is wrapped with 'extern "C" {' so as to avoid name
> mangling.
>
> But when I finally link, I get a message stating that there is an
> "unresolved external symbol _Initialize_VMF_API", i.e., the function
> name with a leading underscore.
Back when I was doing this with GNAT 3.12 and Borland C++, I added the
underscore in the external name:
pragma Export (C, Initialize_VMF_API, "_Initialize_VMF_API");
That worked.
There is also the problem of which C calling convention the C++
compiler is using; Cdecl or stdcall. That can influence which link
name it looks for.
--
-- Stephe
next prev parent reply other threads:[~2002-10-10 20:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-10 20:06 Linking an Ada DLL with MSVC++ Marc A. Criley
2002-10-10 20:50 ` Stephen Leake [this message]
2002-10-11 11:21 ` Marc A. Criley
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