Re: why does gccgit require pthread?

[Andrew Pinski <pinskia@gmail.com>]

On Sun, Nov 6, 2022 at 10:51 PM LIU Hao <lh_mouse@126.com> wrote:
>
> 在 2022-11-07 12:37, Andrew Pinski 写道:
> >
> > The original code which used pthread was added in GCC 5 way before GCC
> > moved to being written in C++11 which was only in the last 3 years.
> > pthread_* functions were the best choice at the time (2014) but now
> > GCC is written in C++11, I don't see any reason not to move them over
> > to using C++11 threading code.
> >
> >
>
> Attached is the proposed patch.
>
> The win32 thread model does not have `std::mutex`; but there is no `pthread_mutex_t` either, so it
> does not build either way.
Oh, but I would assume it will later on right?

Also I think you might need to change some more than you did.
That is:
-#define INCLUDE_PTHREAD_H
 #include "system.h"

You must likely have a macro, INCLUDE_MUTEX, and define that and
include mutex in system.h like it was done for pthread.h.
GCC loves to poison identifiers while lexing to make sure those
identifiers are not used inside GCC and the include of mutex should be
done early.

Thanks,
Andrew

>
> Tested bootstrapping GCC on `{i686,x86_64}-w64-mingw32` with languages
> `c,lto,c++,fortran,objc,obj-c++` and with the `mcf` thread model; no errors observed. The built
> `libgccjit-0.dll` does not have imports from winpthread any more.
>
> Please review.
>
>
> --
> Best regards,
> LIU Hao
>