[LLVMdev] Problems with custom calling convention on Mac OS X

[David Terei]

On 12 February 2010 14:01, Charles Davis <cdavis at mymail.mines.edu> wrote:
> Something I'm doing right now may be of interest to you.
>
> Just today I added support for a new 'alignstack' function attribute.
> With it, you can force the stack to be 16-byte aligned (or n-byte
> aligned, if you so desire) in your functions. This way, you can make
> calls to dylibs on Mac OS X without triggering the misaligned stack error.
>
> Of course, it's a no-op right now (I still have to do the backend work).
> But if you add this attribute to the emitted LLVM functions, when I do
> finish this, the stack will be properly aligned and you won't get this
> error anymore. It will cost you, though, in terms of code size and
> performance.

Sounds great. I'd appreciate if you would ping me or the list when
this lands. Do you think it will make the 2.7 release?

I was hoping to fix this up now though and solve the actual issue are
you or anyone else aware of how to do this?

~ David