Re: [PATCH] pylibfdt: fix with Python 3.10

[David Gibson <david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@public.gmane.org>]

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On Thu, Nov 11, 2021 at 04:05:36PM +0000, Ross Burton wrote:
> Since Python 2.5 the argument parsing functions when parsing expressions
> such as s# (string plus length) expect the length to be an int or a
> ssize_t, depending on whether PY_SSIZE_T_CLEAN is defined or not.
> 
> Python 3.8 deprecated the use of int, and with Python 3.10 this symbol
> must be defined and ssize_t used[1].
> 
> Define the magic symbol when building the extension, and cast the ints
> from the libfdt API to ssize_t as appropriate.
> 
> [1] https://docs.python.org/3.10/whatsnew/3.10.html#id2
> 
> Signed-off-by: Ross Burton <ross.burton-5wv7dgnIgG8@public.gmane.org>

Applied (with the correct to the setup.py location).  Thanks!

> ---
>  pylibfdt/libfdt.i | 4 ++--
>  pylibfdt/setup.py | 1 +
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/pylibfdt/libfdt.i b/pylibfdt/libfdt.i
> index 51ee801..075ef70 100644
> --- a/pylibfdt/libfdt.i
> +++ b/pylibfdt/libfdt.i
> @@ -1044,9 +1044,9 @@ typedef uint32_t fdt32_t;
>  		$result = Py_None;
>  	else
>          %#if PY_VERSION_HEX >= 0x03000000
> -            $result = Py_BuildValue("y#", $1, *arg4);
> +            $result = Py_BuildValue("y#", $1, (Py_ssize_t)*arg4);
>          %#else
> -            $result = Py_BuildValue("s#", $1, *arg4);
> +            $result = Py_BuildValue("s#", $1, (Py_ssize_t)*arg4);
>          %#endif
>  }
>  
> diff --git a/pylibfdt/setup.py b/pylibfdt/setup.py
> index ef40f15..81e161a 100755
> --- a/pylibfdt/setup.py
> +++ b/pylibfdt/setup.py
> @@ -42,6 +42,7 @@ def get_version():
>  libfdt_module = Extension(
>      '_libfdt',
>      sources=[os.path.join(srcdir, 'libfdt.i')],
> +    define_macros=[('PY_SSIZE_T_CLEAN', None)],
>      include_dirs=[os.path.join(srcdir, '../libfdt')],
>      libraries=['fdt'],
>      library_dirs=[os.path.join(top_builddir, 'libfdt')],

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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