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Please, no top-posting. On Nov 28 11:06, Sam Habiel wrote: > Yaakov, > > On Wed, Nov 28, 2018 at 11:01 AM Yaakov Selkowitz <yselkowi@redhat.com> wrote: > > > > 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 ? > > > Are you telling me that gcc has a flag to support AMD ABI on Cygwin > x64? The assembly code is not standalone; it gets called from C code > and calls C code. That's what he's telling you. However, you have to interact with the MS ABI(*) as well as soon as you call external library functions so it makes sense to keep your C code in MS ABI. For the assembler functions, you can just tell the compiler they are in SYSV ABI by adding a function attribute to the declaration: int asm_func (args) __attribute__ ((sysv_abi)) Good luck, Corinna (*) Just keep in mind that Cygwin is LP64, not LLP64: https://cygwin.com/faq/faq.html#faq.programming.64bitporting -- Corinna Vinschen Cygwin Maintainer
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