[Dev-C++] FW: Trouble linking FORTRAN DLL with C++ application (undefined reference)

[Steve K. <dr_...@ho...>]

Is it possible for a Dev-CPP application to link a .lib file produced by 
MSVC++ or Digital Visual Fortran?  If not, could Dev-CPP link with DLL 
created by g77?

I sent a note to comp.lang.fortran (see bottom of message) and got the 
suggestion below by Jugoslav Dujic to check whether Dev-CPP and DVF could be 
made binary-compatible.

Thanks for your help!

- Steve Kramer


From Jugoslav:
__________________________________________

It seems you followed a correct procedure... for linking with Visual C++.

I suspect the problem is that you're using Dev-C++, and I don't know
if it's link-compatible with MSVC++/CVF. Based on the info from web site
you provided, it seems not (it says that its compiler is Mingw port of
gcc).

You'd be probably better off asking this in a Devcpp/mingw/gcc specific
group. The issue is the same as how to call a dll written in VC++ from
that environment (as CVF .dlls and .libs are the same as VC++ looking
from outside).

--
Jugoslav

___________________________________________________


----Original Message Follows----
From: pos...@go...
Reply-To: pos...@go...
To: dr_...@ho...
Subject: Trouble linking FORTRAN DLL with C++ application (undefined 
reference)
Date: Tue, 27 Jan 2004 17:16:07 -0800

From: dr_...@ho... (Steve Kramer)
Newsgroups: comp.lang.fortran
Subject: Trouble linking FORTRAN DLL with C++ application (undefined 
reference)
NNTP-Posting-Host: 24.206.121.222
Message-ID: <538...@po...>

I created a FORTRAN DLL with Digital Visual Fortran 6.0 and have been
able to access that DLL successfully from a calling application in
FORTRAN.

I'm now trying to call the same FORTRAN DLL from C++ and am having
trouble with the getting the calling conventions right.  I have
reviewed some relevant articles in comp.lang.fortran and in the Intel
developer forum, including these:

http://groups.google.com/groups?selm=68rm8a%249ej%40usenet.pa.dec.com&oe=UTF-8&output=gplain

http://groups.google.com/groups?selm=9prq7m%24kef4q%241%40ID-106075.news.dfncis.de&oe=UTF-8&output=gplain

http://softwareforums.intel.com/ids/board/message?board.id=15&message.id=739

Based on those and other articles, here's how I set things up.

(1) FORTRAN DLL source code:

Subroutine FORTRANINIT(int1,int2)
!
!
!DEC$ ATTRIBUTES DLLEXPORT::FORTRANINIT
!DEC$ ATTRIBUTES ALIAS : "_FORTRANINIT@8" :: FORTRANINIT

INTEGER*4 int1, int2

(2) Calling C++ program source code:

extern "C"
   {
       __declspec(dllimport) void __stdcall FORTRANINIT(int* int1,
             int* int2);
   }

   void main()
   {
         int int1, int2;

    <snip>

	FORTRANINIT(&int1, &int1);
   }

(3) Building/compiling:

(a) I built FORTRANINIT.dll first (in DVF 6.0) and copied it to the
     C++ application's directory.

(b) I added the FORTRANINIT.lib file to the C++ project in Bloodshed
     Dev-C++ 4.0 (from www.bloodshed.net/devcpp.html) and compiled the
     calling C++ application.

(c) There were no compilation errors, but there was a linker error:

     undefined reference to `_imp__FORTRANINIT@8'

Any ideas as to what I'm missing here?  I would like to be able to
call the same FORTRAN DLL from FORTRAN and C++.  I have tried
omitting both the FORTRAN ALIAS as well as the __declspec(dllimport)
in C++ without any luck.

Thanks in advance for the help!

  - Steve Kramer

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