[PATCH] Bug 14984 - Implement __attribute__((ms_abi))

Charles Davis cdavis5x at gmail.com
Wed Jun 12 04:13:57 PDT 2013

On Jun 11, 2013, at 4:05 PM, Reid Kleckner wrote:

> On Tue, Jun 11, 2013 at 5:52 PM, Richard Smith <richard at metafoo.co.uk> wrote:
> On Tue, Jun 11, 2013 at 3:44 AM, Benno Rice <benno at freebsd.org> wrote:
> > Hi all,
> >
> > I've attached a patch to the bug at:
> >
> > http://llvm.org/bugs/show_bug.cgi?id=14984
> >
> > that implements the necessary glue to support __attribute__((ms_abi)).
> >
> > If anyone has any questions, please let me know off-list.
> Does gcc intend for ms_abi to cover other ABI areas like struct layout?
> It's not clear to me that representing this as a separate calling
> convention in Clang is the right approach. We support at least four
> different calling conventions when targeting the MS ABI (__cdecl,
> __fastcall, __stdcall, __thiscall); perhaps this attribute should be
> mapped to the appropriate member from that set? What should
> __attribute__((ms_abi)) do when we're targeting the MS ABI already?
> (Do you get a canonically-different type, or the same type, or is it
> an error?)
> What's lacking today is a way to get at the win64 convention in Clang or from LLVM when targetting a non-Windows platform.  LLVM might want to have a different internal name that's less vague that "ms_abi", though.
You mean like in my patch here:


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