32 bit vs 64 bit Cygwin, followup

Yaakov Selkowitz yselkowi@redhat.com
Wed Nov 28 16:01:00 GMT 2018

On Mon, 2018-11-26 at 14:07 -0500, Sam Habiel wrote:
> Hello everybody,
> In this message
> (https://www.sourceware.org/ml/cygwin/2018-11/msg00190.html), Corinna
> (Hi Corinna!) says:
> "Don't do that.  Use 64 bit Cygwin whenever possible.  32 bit is a lost cause."
> I would like to mention why I am still using 32 bit Cygwin.
> I maintain a port of a database called GT.M
> (https://en.wikipedia.org/wiki/GT.M) on Cygwin. I work with Electronic
> Medical Records that run on this database. GT.M contains a large
> amount of assembly code, written to run on the x32 Linux ABI and the
> AMD x64 ABI. It's was very easy to get the x32 Linux ABI to run on
> Cygwin x32; Cygwin x64 on the other hand uses the Windows x64 ABI,
> which is very different than the AMD ABI (more detail here:
> https://eli.thegreenplace.net/2011/09/06/stack-frame-layout-on-x86-64/).
> I don't have the expertise nor the time to rewrite a lot of assembly
> code to use the Windows x64 ABI. There are about 100 source code files
> that are in assembly.

-mabi=sysv ?

> By the way, thank you for the Async IO APIs. I needed those for newer
> versions of GT.M and was able to port it successfully to Cygwin x32.

Yaakov Selkowitz
Senior Software Engineer - Platform Enablement
Red Hat, Inc.

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