[PATCH v4 4/4] python3-dtc: fix build with swig 4.5.0

[Jaipaul Cheernam <jaipaul.cheernam@est.tech>]

SWIG 4.5.0 removed Python 2 compatibility macros (PyInt_*, PyString_*)
from its runtime. Backport the upstream fix to replace them with
Python 3 equivalents.

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 ...-removed-SWIG-Python-2-compatibility.patch | 57 +++++++++++++++++++
 .../python/python3-dtc_1.8.1.bb               |  1 +
 2 files changed, 58 insertions(+)
 create mode 100644 meta/recipes-devtools/python/python3-dtc/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch

diff --git a/meta/recipes-devtools/python/python3-dtc/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch b/meta/recipes-devtools/python/python3-dtc/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch
new file mode 100644
index 0000000000..877aea3a8d
--- /dev/null
+++ b/meta/recipes-devtools/python/python3-dtc/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]
+
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ pylibfdt/libfdt.i | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/pylibfdt/libfdt.i b/pylibfdt/libfdt.i
+index 1f9c0471..b1cb9873 100644
+--- a/pylibfdt/libfdt.i
++++ b/pylibfdt/libfdt.i
+@@ -1136,7 +1136,7 @@ typedef uint32_t fdt32_t;
+ 	PyObject *buff;
+ 
+ 	if ($1) {
+-		resultobj = PyString_FromString(
++		resultobj = PyUnicode_FromString(
+ 			fdt_string(fdt1, fdt32_to_cpu($1->nameoff)));
+ 		buff = PyByteArray_FromStringAndSize(
+ 			(const char *)($1 + 1), fdt32_to_cpu($1->len));
+@@ -1169,13 +1169,13 @@ typedef uint32_t fdt32_t;
+         }
+         $1 = PyBytes_AsString($input);
+     %#else
+-        $1 = PyString_AsString($input);   /* char *str */
++        $1 = PyBytes_AsString($input);   /* char *str */
+     %#endif
+ }
+ 
+ /* typemaps used for fdt_next_node() */
+ %typemap(in, numinputs=1) int *depth (int depth) {
+-   depth = (int) PyInt_AsLong($input);
++   depth = (int) PyLong_AsLong($input);
+    $1 = &depth;
+ }
+ 
diff --git a/meta/recipes-devtools/python/python3-dtc_1.8.1.bb b/meta/recipes-devtools/python/python3-dtc_1.8.1.bb
index 51abf3640a..915cd6a730 100644
--- a/meta/recipes-devtools/python/python3-dtc_1.8.1.bb
+++ b/meta/recipes-devtools/python/python3-dtc_1.8.1.bb
@@ -7,6 +7,7 @@ LICENSE = "BSD-2-Clause OR GPL-2.0-only"
 DEPENDS = "flex-native bison-native swig-native python3-setuptools-scm-native libyaml dtc"
 
 SRC_URI = "git://git.kernel.org/pub/scm/utils/dtc/dtc.git;branch=main;protocol=https;tag=v${PV} \
+           file://0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch \
            "
 
 UPSTREAM_CHECK_GITTAGREGEX = "v(?P<pver>\d+(\.\d+)+)"