Re: [OE-core] [PATCH v3 3/4] u-boot-tools: fix pylibfdt build with swig 4.5.0

[Quentin Schulz <quentin.schulz@cherry.de>]

Hi Jaipaul,

On 8/11/26 1:11 PM, Jaipaul Cheernam via lists.openembedded.org wrote:
> SWIG 4.5.0 removed Python 2 compatibility macros (PyInt_*, PyString_*)
> from its runtime. Backport the dtc upstream fix to u-boot's bundled
> pylibfdt/libfdt.i to replace them with Python 3 equivalents.
> 
> Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
> ---
>   ...-removed-SWIG-Python-2-compatibility.patch | 57 +++++++++++++++++++
>   .../u-boot/u-boot-tools_2026.07.bb            |  4 +-
>   2 files changed, 60 insertions(+), 1 deletion(-)
>   create mode 100644 meta/recipes-bsp/u-boot/files/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch
> 
> diff --git a/meta/recipes-bsp/u-boot/files/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch b/meta/recipes-bsp/u-boot/files/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch
> new file mode 100644
> index 0000000000..5fdccf5e9d
> --- /dev/null
> +++ b/meta/recipes-bsp/u-boot/files/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch
> @@ -0,0 +1,57 @@
> +From 32378d7b4383a79d13da9005035600d8f0c8c29d Mon Sep 17 00:00:00 2001
> +From: Jitka Plesnikova <jplesnik@redhat.com>
> +Date: Tue, 29 Jul 2026 05:55:56 +0000
> +Subject: [PATCH] pylibfdt: Replace removed SWIG Python 2 compatibility macros
> +
> +SWIG 4.5.0 removed Python 2 compatibility macros (PyInt_*, PyString_*)
> +from its runtime header pyhead.swg (see commit 79f7a2b7cb7d). Replace
> +them with their Python 3 C API equivalents:
> +
> +- PyString_FromString -> PyUnicode_FromString
> +- PyString_AsString -> PyBytes_AsString
> +- PyInt_AsLong -> PyLong_AsLong
> +
> +The replacements are safe since the macros were already aliased to
> +these exact functions in SWIG's Python 3 code path.
> +
> +Signed-off-by: Jitka Plesnikova <jplesnik@redhat.com>
> +Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
> +Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> +(cherry picked from commit 5008d1d6a356b8d0a78060da2e1021507d529cff)
> +
> +Upstream-Status: Backport [https://github.com/dgibson/dtc/commit/5008d1d6a356b8d0a78060da2e1021507d529cff]
> +

Not a backport. This commit doesn't exist in U-Boot. Please work with 
upstream U-Boot on fixing this so that other build systems/distros don't 
need to duplicate the work and we don't have to carry this patch forever 
in Yocto.

Cheers,
Quentin