--with-threads=ucontext portability (was Re: [stunnel-users] stunnel4.x.x and IRIX)

[Michal Trojnara]

Miloslav Trmac wrote:
> I have just seen a crash at a similar place on x86_64.  The 
> apparent cause is sthreads.c:116:
>     makecontext(&ctx->ctx, (void(*)(void))cli, 1, arg); arg 
> is a void *, but:
> - the size is given as 1; it should be
>   (sizeof (arg) + sizeof (int) - 1) / sizeof (int)
>   because the "size" is defined as a number of int arguments
> - it won't work anyway; makecontext () is defined to work only for
>   integer parameters.  It is not possible to pass a pointer as
>   integers on x86_64, which uses registers to pass the first 6
>   integer or pointer parameters.

Are we still talking about IRIX?
http://nixdoc.net/man-pages/IRIX/man3c/makecontext.3c.html
I can't find any of mentioned limitations in the manual.
Just the opposite: "the arguments that follow the argc parameter for
makecontext are restricted to longs and pointers only".

Best regards,
    Mike