Re: [PATCH] pl: fix can not build free-thread for plpython extension like 3.14t

Hi

I understand the reason for using Py_LIMITED_API, and python 3.14t is a
standard build from cpython team.

link:
https://docs.python.org/3/whatsnew/3.14.html#whatsnew314-free-threaded-now-supported

It seems the only way to build plpython for free-thread python is to use
Py_LIMITED_API, otherwise it fails to build.

Thanks
Hong Yi

On Fri, Jan 16, 2026 at 12:01 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> =?UTF-8?B?5rSq5LyK?= <zouzou0208(at)gmail(dot)com> writes:
> > This patch fix can not build plpython for free-thread python like
> > python3.14t
>
> We've gone to fairly considerable trouble to switch to using Python's
> limited API, for reasons described here:
>
>
> https://www.postgresql.org/message-id/ee410de1-1e0b-4770-b125-eeefd4726a24@eisentraut.org
>
> I don't see why we should abandon that for the convenience of
> somebody's evidently-nonstandard Python build.
>
> The proposed patch also breaks the header isolation that
> the separate plpython_system.h header is meant to maintain.
> Arguably we should have #define'd Py_LIMITED_API inside
> plpython_system.h, not where it is. But I don't feel a need
> to mess with that without a far better argument for why
> we should change this at all.
>
> regards, tom lane
>