python3-dtc: port to Python 3.10

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

recipes-kernel/dtc/files/ssize.patch

@@ -0,0 +1,35 @@
+Python 3.10 has made it mandatory that the 'string+length` formats use ssize_t
+instead of int, so define the magic symbol and upcast the ints from the libfdt
+API to ssize_t.
+
+Upstream-Status: Pending
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+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..88ff7d1 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')],

recipes-kernel/dtc/python3-dtc_1.6.1.bb

@@ -6,7 +6,8 @@ LICENSE = "GPLv2 | BSD-2-Clause"
 
 DEPENDS = "flex-native bison-native swig-native libyaml dtc"
 
-SRC_URI = "git://git.kernel.org/pub/scm/utils/dtc/dtc.git;branch=master"
+SRC_URI = "git://git.kernel.org/pub/scm/utils/dtc/dtc.git;branch=master \
+           file://ssize.patch"
 
 UPSTREAM_CHECK_GITTAGREGEX = "v(?P<pver>\d+(\.\d+)+)"