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Date: Wed, 3 Sep 2025 12:56:17 -0700 (PDT)
X-X-Sender: jeremyd AT resin DOT csoft DOT net
To: Mark Liam Brown <brownmarkliam AT gmail DOT com>
cc: cygwin AT cygwin DOT com
Subject: Re: Deploy DLL for ARM64 and AMD64 in the same PATH?
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From: Jeremy Drake via Cygwin <cygwin AT cygwin DOT com>
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On Wed, 3 Sep 2025, Mark Liam Brown via Cygwin wrote:

> Greetings
>
> Our software needs a 3rd party DLL (we cannot change the name...), but
> we want to support ARM64 together with AMD64.
>
> Does Windows or Cygwin have a mechanism to deal with the situation
> that both expects the DLL to be in the same path?

Not really.  The closest thing is ARM64EC and ARM64X, a DLL built with
those will let you use the same DLL for both ARM64 and x64, but only on
ARM64.  I know there has been work to support those in LLVM/LLD and
mingw-w64, don't know about gcc/binutils support.

I think they expect the installer to decide which type of DLL to install
based on the host machine...

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