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Date:	Fri, 3 Sep 2021 13:10:59 -0300
Message-ID:	<CAGc1aY-oHMoGc8B9DJVBc8RcxfWPv4g5tYB1foAcYN5PTEXr6A@mail.gmail.com>
Subject:	About DLL compilation problem
To:	cygwin AT cygwin DOT com
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From:	Ricardo Santos Pereira via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Ricardo Santos Pereira <arsoftware25 AT gmail DOT com>
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

Hi Corina

just figured out that a .def file in a dll may export function from a dll
that is referenced in the compilation stage like this:

gcc file.c external.dll def.def -o out.dll

if in the def.def it has a function that is in the file.c and also
available in external.dll it may generate an invalid out.dll

I don't know but this looks like a problem in gcc that need to be fixed,
spend one hour modifying my function in file.c and it was linking with
external.dll

then I commented the function inside file.c and saw the compilation stage
finished without a link error

if it is a GCC feature then a warning about expernal DLL linkage could help
a lot when the function exported is inside an external DLL

hope to have explained it in an easy way

Ricardo

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