[PATCH 1 of 4 stable] cext: fix for PyLong refactoring in CPython 3.12

[Raphaël Gomès]

Queued¹ (by Pierre-Yves, reviewed by me) all except the redundant 
Cargo.toml patch with slightly one modified patch due to formatting.

[1] 
https://foss.heptapod.net/mercurial/mercurial-devel/-/merge_requests/505/

On 3/7/23 19:23, Mads Kiilerich wrote:
> # HG changeset patch
> # User Mads Kiilerich <mads at kiilerich.com>
> # Date 1678202751 -3600
> #      Tue Mar 07 16:25:51 2023 +0100
> # Branch stable
> # Node ID 1efa4e96f6461bf071b28d66b13bdb67fdc91fc6
> # Parent  8a65b43457aba02741bedabe100823d3041af0b5
> cext: fix for PyLong refactoring in CPython 3.12
>
> Compiling Mercurial with Python 3.12 a5 would fail with:
>
> mercurial/cext/dirs.c: In function '_addpath':
> mercurial/cext/dirs.c:19:44: error: 'PyLongObject' {aka 'struct _longobject'} has no member named 'ob_digit'
>     19 | #define PYLONG_VALUE(o) ((PyLongObject *)o)->ob_digit[0]
>        |                                            ^~
> mercurial/cext/dirs.c:97:25: note: in expansion of macro 'PYLONG_VALUE'
>     97 |                         PYLONG_VALUE(val) += 1;
>        |                         ^~~~~~~~~~~~
> mercurial/cext/dirs.c:19:44: error: 'PyLongObject' {aka 'struct _longobject'} has no member named 'ob_digit'
>     19 | #define PYLONG_VALUE(o) ((PyLongObject *)o)->ob_digit[0]
>        |                                            ^~
> mercurial/cext/dirs.c:108:17: note: in expansion of macro 'PYLONG_VALUE'
>    108 |                 PYLONG_VALUE(val) = 1;
>        |                 ^~~~~~~~~~~~
> mercurial/cext/dirs.c: In function '_delpath':
> mercurial/cext/dirs.c:19:44: error: 'PyLongObject' {aka 'struct _longobject'} has no member named 'ob_digit'
>     19 | #define PYLONG_VALUE(o) ((PyLongObject *)o)->ob_digit[0]
>        |                                            ^~
> mercurial/cext/dirs.c:145:23: note: in expansion of macro 'PYLONG_VALUE'
>    145 |                 if (--PYLONG_VALUE(val) <= 0) {
>        |                       ^~~~~~~~~~~~
>
> This was caused by
> https://github.com/python/cpython/commit/c1b1f51cd1632f0b77dacd43092fb44ed5e053a9 .
>
> diff --git a/mercurial/cext/dirs.c b/mercurial/cext/dirs.c
> --- a/mercurial/cext/dirs.c
> +++ b/mercurial/cext/dirs.c
> @@ -13,7 +13,11 @@
>   
>   #include "util.h"
>   
> +#if PY_VERSION_HEX >= 0x030C00A5
> +#define PYLONG_VALUE(o) ((PyLongObject *)o)->long_value.ob_digit[0]
> +#else
>   #define PYLONG_VALUE(o) ((PyLongObject *)o)->ob_digit[0]
> +#endif
>   
>   /*
>    * This is a multiset of directory names, built from the files that
>
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