interpreters/python: Add ctypes prototype patches for NuttX

Integrate NuttX-specific ctypes and posixmodule updates.

Signed-off-by: Tiago Medicci <tiago.medicci@espressif.com>

interpreters/python/Kconfig

@@ -6,6 +6,7 @@
 config INTERPRETERS_CPYTHON
 	tristate "CPython"
 	depends on LIB_ZLIB
+	depends on !LIBC_DLFCN || LIB_LIBFFI
 	depends on EXPERIMENTAL
 	default n
 	---help---

interpreters/python/Makefile

@@ -88,6 +88,9 @@ $(CPYTHON_UNPACKNAME): $(CPYTHON_ZIP)
 	$(Q) patch -p1 -d $(CPYTHON_UNPACKNAME) < patch$(DELIM)0016-fix-timezone-offset-check-when-time-t-is-unsigned.patch
 	$(Q) patch -p1 -d $(CPYTHON_UNPACKNAME) < patch$(DELIM)0017-stdlib-zip-keep-pydecimal-and-trim-tooling-extras.patch
 	$(Q) patch -p1 -d $(CPYTHON_UNPACKNAME) < patch$(DELIM)0018-ignore-chmod-on-nuttx-like-wasi.patch
+	$(Q) patch -p1 -d $(CPYTHON_UNPACKNAME) < patch$(DELIM)0019-undef-get_errno-set_errno-to-avoid-nuttx-macro-coll.patch
+	$(Q) patch -p1 -d $(CPYTHON_UNPACKNAME) < patch$(DELIM)0020-ctypes-skip-pythonapi-on-nuttx.patch
+	$(Q) patch -p1 -d $(CPYTHON_UNPACKNAME) < patch$(DELIM)0021-posixmodule-ignore-utime-enosys-on-nuttx.patch
 
 $(HOSTPYTHON):
 	mkdir -p $(HOSTBUILD)
@@ -128,6 +131,9 @@ $(SETUP_LOCAL):
 ifneq ($(CONFIG_ARCH_HAVE_FORK),y)
 	@echo "_posixsubprocess" >> $@
 endif
+ifneq ($(CONFIG_LIBC_DLFCN),y)
+	@echo "_ctypes" >> $@
+endif
 
 # For the Python's `configure` script, please consider the following
 # when building for NuttX:

interpreters/python/Setup.local.in

@@ -11,7 +11,6 @@ _codecs_iso2022
 _codecs_jp
 _codecs_kr
 _codecs_tw
-_ctypes
 _decimal
 _elementtree
 _heapq

interpreters/python/config.site.in

@@ -31,3 +31,7 @@ export ac_cv_func_utimes="yes"
 export ac_cv_func_getuid="yes"
 export ac_cv_func_sysconf="yes"
 export ac_cv_func_umask="yes"
+export ac_cv_func_ffi_prep_cif_var="yes"
+export ac_cv_func_ffi_prep_closure_loc="yes"
+export ac_cv_func_ffi_closure_alloc="yes"
+export ac_cv_func_utimes="no"

interpreters/python/patch/0019-undef-get_errno-set_errno-to-avoid-nuttx-macro-coll.patch

@@ -0,0 +1,17 @@
+--- a/Modules/_ctypes/callproc.c
++++ b/Modules/_ctypes/callproc.c
+@@ -91,6 +91,14 @@
+ #include <alloca.h>
+ #endif
+ 
++/* NuttX errno.h defines get_errno() and set_errno(e) as macros.
++   Undef them so that CPython's static functions of the same name
++   in this file compile without conflict. */
++#ifdef __NuttX__
++#undef get_errno
++#undef set_errno
++#endif
++
+ #ifdef _Py_MEMORY_SANITIZER
+ #include <sanitizer/msan_interface.h>
+ #endif

interpreters/python/patch/0020-ctypes-skip-pythonapi-on-nuttx.patch

@@ -0,0 +1,11 @@
+--- a/Lib/ctypes/__init__.py
++++ b/Lib/ctypes/__init__.py
+@@ -481,6 +481,8 @@
+     pythonapi = PyDLL("libpython%d.%d.so" % _sys.version_info[:2])
+ elif _sys.platform == "cygwin":
+     pythonapi = PyDLL("libpython%d.%d.dll" % _sys.version_info[:2])
++elif _sys.platform == "nuttx":
++    pythonapi = None
+ else:
+     pythonapi = PyDLL(None)
+ 

interpreters/python/patch/0021-posixmodule-ignore-utime-enosys-on-nuttx.patch

@@ -0,0 +1,16 @@
+--- a/Modules/posixmodule.c
++++ b/Modules/posixmodule.c
+@@ -6666,6 +6666,13 @@
+     }
+ #endif
+ 
++#if defined(__NuttX__)
++    if (result == -1 && errno == ENOSYS) {
++        /* SmartFS and other NuttX fs do not implement chstat. */
++        Py_RETURN_NONE;
++    }
++#endif
++
+     if (result < 0) {
+         path_error(path);
+         return NULL;