[PATCH 2/3] Move register_t to system-specific header

[Sebastian Huber]

----- Am 14. Feb 2019 um 15:02 schrieb Corinna Vinschen vinschen@redhat.com:

> On Feb 14 11:15, Sebastian Huber wrote:
>> 
>> 
>> ----- Am 13. Feb 2019 um 21:28 schrieb Corinna Vinschen vinschen@redhat.com:
>> 
>> > On Feb 13 20:01, Sebastian Huber wrote:
>> >> ----- Am 13. Feb 2019 um 18:06 schrieb Corinna Vinschen vinschen@redhat.com:
>> >> 
>> >> > On Feb 13 14:19, Sebastian Huber wrote:
>> [...]
>> >> If I change the type to __intptr_t wounldn't this break ABI
>> >> compatibility on Cygwin?
>> > 
>> > In how far?  Cygwin's 64 bit ABI is LP64.
>> 
>> The type for register_t changes from int to __intptr_to, so 32-bit to 64-bit on
>> LP64.
> 
> register_t is not used in Cygwin itself.  I don't know its purpose,
> actually.  If it has been defined as 32 bit type on 64 bit, wasn't that
> a bug and thus unusable before?

Yes, a 32-bit register_t type on an LP64 system is a bug. It is used in some situations like intptr_t in FreeBSD.