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From:	Philip Kime <philkime AT kime DOT org DOT uk>
Date:	Wed, 18 May 2011 15:38:04 +0200
Message-ID:	<BANLkTiniRAuZ=04JLVHcQ=_cydAk3kDhbA@mail.gmail.com>
Subject:	Building a vendor perl module with gcc under cygwin
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Greetings,
  I am having a hell of time trying to build a vendor-supplied perl
module under gcc in cygwin. I know it compiles with gcc under Linux
and Unix, as well as with VC under windows. I'm using cygwin 1.7.9 and
gcc 4.3.4. This is 64-bit windows.

The module creates a .dll which needs to link to one other vendor
supplied library for which I have the .dll and .lib import library.
I'm using the 32-bit version of the library I need.

I have managed to get as far as building the module .dll but when I
try to load it, I get (module is called "MOD" below):

Can't load 'blib/arch/auto/MOD/MOD.dll' for module MOD: Exec format
error at /usr/lib/perl5/5.10/i686-cygwin/DynaLoader.pm line 200.

When I look at the MOD.dll with ldd, I get:

        ntdll.dll => /cygdrive/c/Windows/SysWOW64/ntdll.dll (0x77c40000)
        kernel32.dll => /cygdrive/c/Windows/syswow64/kernel32.dll (0x76020000)
        KERNELBASE.dll => /cygdrive/c/Windows/syswow64/KERNELBASE.dll
(0x77420000)

        ??? => ??? (0x6e300000)

which doesn't look good. It's not clear to me which flags I need to
pass to gcc. I believe that I shouldn't use "-mdll" any more. I tried
"-shared" but this gives me undefined SSP symbols.

nm output for MOD.dll looks normal.

Any ideas appreciated.

-- 
Dr Philip Kime

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