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

Reid Kleckner rnk at google.com
Tue Jun 11 15:05:49 PDT 2013

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.
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