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Message-ID: <557B48AD.5090504@ipno.in2p3.fr>
Date: Fri, 12 Jun 2015 23:01:33 +0200
From: Laurent Tassan-Got <tassango AT ipno DOT in2p3 DOT fr>
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To: cygwin AT cygwin DOT com
Subject: Problem linking with an import library (.lib) file:
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    I got the same problem as Mark Rivers, already reported with the 
same subject.

    I'm running cygwin 32-bits version 2.0.3 under Windows 7 64 bits

  I got from a hardware manufacturer a DLL N957lib.dll and the 
associated import library N957lib.lib

When I try to link a small test program with the command:
gcc -Wall -DWIN32 -I. -o tst tst.c ./N957lib.lib
I get the message:
"N957lib.lib: error adding symbols: Format de fichier non reconnu" (File 
in wrong format)

Now if I use the MingW compiler (either under cygwin or Msys):
i686-pc-mingw32-gcc -Wall -DWIN32 -I. -o tst tst.c ./N957lib.lib
everything is fine and the program (tst.exe) executes as expected,
for example printing error messages issued by the library.
But this doesn't help me because I need the full cygwin capabilities 
(X11, Lesstif)

The cygwin gcc version is 4.9.2, while the MingW one is 4.7.3, so that 
it seems
that there is a problem in decoding .lib libraries with the newest gcc 
versions.

I tried to bypass the problem by re-building the .lib from the dll by 
using pexports
and dlltool. I get a .lib with the right format, readable by gcc, but 
some references are still missing
at the link stage.

Any hint about the gcc (ld) decoding of .lib ?


-- 

             ************************************
             *   Laurent TASSAN-GOT             *
             *   IPN - Bat 102                  *
             *   Universite Paris-Sud           *
             *   91406 ORSAY Cedex (France)     *
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             *   email : tassango AT ipno DOT in2p3 DOT fr *
             ************************************
             

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