Fwd: non-ifunc pt-vfork

[Richard Henderson]

On 05/23/2014 01:43 PM, Roland McGrath wrote:
>> +/* WARNING: If the compiler cannot turn this into a tail call,
>> +   then this mechanism will fail.  The parent will save a return
>> +   address on the stack which will be clobbered by the child.  */
> 
> Good point.  That should have occurred to me.
> 
>> or to remove the non-ifunc portion of this file entirely.  It does seem like
>> this sort of thing is going to have to be decided on a host-by-host basis,
>> and at least unavailable ifunc will error out at compile-time.
> 
> That would be fine with me.
> 
>> Alternately, we could drop this tail call stuff and just include vfork.os in
>> libpthread.so.  It's not like it's a gigantic object file...
> 
> Any individual machine is free to do that.

Oh, I forgot to ask -- were you intending to make the pthread vfork
non-default, so that new programs would always link to the libc vfork?


r~