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gh-84461: Add sys._emscripten_info, improve docs and build (gh-91781)
This commit is contained in:
parent
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9b5ca5405e
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@ -314,6 +314,35 @@ always available.
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yourself to control bytecode file generation.
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.. data:: _emscripten_info
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A :term:`named tuple` holding information about the environment on the
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*wasm32-emscripten* platform. The named tuple is provisional and may change
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in the future.
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.. tabularcolumns:: |l|L|
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+-----------------------------+----------------------------------------------+
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| Attribute | Explanation |
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+=============================+==============================================+
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| :const:`emscripten_version` | Emscripten version as tuple of ints |
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| | (major, minor, micro), e.g. ``(3, 1, 8)``. |
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+-----------------------------+----------------------------------------------+
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| :const:`runtime` | Runtime string, e.g. browser user agent, |
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| | ``'Node.js v14.18.2'``, or ``'UNKNOWN'``. |
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+-----------------------------+----------------------------------------------+
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| :const:`pthreads` | ``True`` if Python is compiled with |
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| | Emscripten pthreads support. |
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+-----------------------------+----------------------------------------------+
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| :const:`shared_memory` | ``True`` if Python is compiled with shared |
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| | memory support. |
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+-----------------------------+----------------------------------------------+
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.. availability:: WebAssembly Emscripten platform (*wasm32-emscripten*).
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.. versionadded:: 3.11
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.. data:: pycache_prefix
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If this is set (not ``None``), Python will write bytecode-cache ``.pyc``
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@ -222,12 +222,7 @@ def _can_start_thread() -> bool:
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support (-s USE_PTHREADS / __EMSCRIPTEN_PTHREADS__).
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"""
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if sys.platform == "emscripten":
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try:
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_thread.start_new_thread(lambda: None, ())
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except RuntimeError:
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return False
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else:
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return True
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return sys._emscripten_info.pthreads
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elif sys.platform == "wasi":
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return False
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else:
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@ -629,6 +629,14 @@ def test_thread_info(self):
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self.assertIn(info.name, ('nt', 'pthread', 'solaris', None))
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self.assertIn(info.lock, ('semaphore', 'mutex+cond', None))
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@unittest.skipUnless(support.is_emscripten, "only available on Emscripten")
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def test_emscripten_info(self):
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self.assertEqual(len(sys._emscripten_info), 4)
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self.assertIsInstance(sys._emscripten_info.emscripten_version, tuple)
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self.assertIsInstance(sys._emscripten_info.runtime, (str, type(None)))
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self.assertIsInstance(sys._emscripten_info.pthreads, bool)
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self.assertIsInstance(sys._emscripten_info.shared_memory, bool)
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def test_43581(self):
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# Can't use sys.stdout, as this is a StringIO object when
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# the test runs under regrtest.
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@ -0,0 +1,2 @@
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Add provisional :data:`sys._emscripten_info` named tuple with build-time and
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run-time information about Emscripten platform.
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@ -48,6 +48,10 @@ extern void *PyWin_DLLhModule;
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extern const char *PyWin_DLLVersionString;
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#endif
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#ifdef __EMSCRIPTEN__
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#include <emscripten.h>
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#endif
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/*[clinic input]
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module sys
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[clinic start generated code]*/
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@ -2686,6 +2690,107 @@ make_impl_info(PyObject *version_info)
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return NULL;
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}
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#ifdef __EMSCRIPTEN__
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PyDoc_STRVAR(emscripten_info__doc__,
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"sys._emscripten_info\n\
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\n\
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WebAssembly Emscripten platform information.");
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static PyTypeObject *EmscriptenInfoType;
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static PyStructSequence_Field emscripten_info_fields[] = {
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{"emscripten_version", "Emscripten version (major, minor, micro)"},
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{"runtime", "Runtime (Node.JS version, browser user agent)"},
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{"pthreads", "pthread support"},
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{"shared_memory", "shared memory support"},
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{0}
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};
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static PyStructSequence_Desc emscripten_info_desc = {
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"sys._emscripten_info", /* name */
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emscripten_info__doc__ , /* doc */
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emscripten_info_fields, /* fields */
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4
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};
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EM_JS(char *, _Py_emscripten_runtime, (void), {
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var info;
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if (typeof navigator == 'object') {
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info = navigator.userAgent;
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} else if (typeof process == 'object') {
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info = "Node.js ".concat(process.version)
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} else {
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info = "UNKNOWN"
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}
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var len = lengthBytesUTF8(info) + 1;
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var res = _malloc(len);
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stringToUTF8(info, res, len);
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return res;
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});
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static PyObject *
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make_emscripten_info(void)
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{
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PyObject *emscripten_info = NULL;
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PyObject *version = NULL;
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char *ua;
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int pos = 0;
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emscripten_info = PyStructSequence_New(EmscriptenInfoType);
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if (emscripten_info == NULL) {
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return NULL;
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}
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version = Py_BuildValue("(iii)",
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__EMSCRIPTEN_major__, __EMSCRIPTEN_minor__, __EMSCRIPTEN_tiny__);
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if (version == NULL) {
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goto error;
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}
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PyStructSequence_SET_ITEM(emscripten_info, pos++, version);
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ua = _Py_emscripten_runtime();
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if (ua != NULL) {
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PyObject *oua = PyUnicode_DecodeUTF8(ua, strlen(ua), "strict");
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free(ua);
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if (oua == NULL) {
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goto error;
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}
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PyStructSequence_SET_ITEM(emscripten_info, pos++, oua);
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} else {
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Py_INCREF(Py_None);
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PyStructSequence_SET_ITEM(emscripten_info, pos++, Py_None);
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}
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#define SetBoolItem(flag) \
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PyStructSequence_SET_ITEM(emscripten_info, pos++, PyBool_FromLong(flag))
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#ifdef __EMSCRIPTEN_PTHREADS__
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SetBoolItem(1);
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#else
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SetBoolItem(0);
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#endif
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#ifdef __EMSCRIPTEN_SHARED_MEMORY__
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SetBoolItem(1);
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#else
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SetBoolItem(0);
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#endif
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#undef SetBoolItem
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if (PyErr_Occurred()) {
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goto error;
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}
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return emscripten_info;
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error:
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Py_CLEAR(emscripten_info);
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return NULL;
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}
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#endif // __EMSCRIPTEN__
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static struct PyModuleDef sysmodule = {
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PyModuleDef_HEAD_INIT,
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"sys",
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@ -2821,6 +2926,16 @@ _PySys_InitCore(PyThreadState *tstate, PyObject *sysdict)
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}
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}
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#ifdef __EMSCRIPTEN__
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if (EmscriptenInfoType == NULL) {
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EmscriptenInfoType = PyStructSequence_NewType(&emscripten_info_desc);
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if (EmscriptenInfoType == NULL) {
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goto type_init_failed;
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}
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}
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SET_SYS("_emscripten_info", make_emscripten_info());
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#endif
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/* adding sys.path_hooks and sys.path_importer_cache */
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SET_SYS("meta_path", PyList_New(0));
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SET_SYS("path_importer_cache", PyDict_New());
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@ -3066,6 +3181,9 @@ _PySys_Fini(PyInterpreterState *interp)
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#endif
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_PyStructSequence_FiniType(&Hash_InfoType);
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_PyStructSequence_FiniType(&AsyncGenHooksType);
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#ifdef __EMSCRIPTEN__
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Py_CLEAR(EmscriptenInfoType);
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#endif
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}
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}
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@ -4,11 +4,17 @@ # Python WebAssembly (WASM) build
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This directory contains configuration and helpers to facilitate cross
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compilation of CPython to WebAssembly (WASM). For now we support
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*wasm32-emscripten* builds for modern browser and for *Node.js*. It's not
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possible to build for *wasm32-wasi* out-of-the-box yet.
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*wasm32-emscripten* builds for modern browser and for *Node.js*. WASI
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(*wasm32-wasi*) is work-in-progress
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## wasm32-emscripten build
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For now the build system has two target flavors. The ``Emscripten/browser``
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target (``--with-emscripten-target=browser``) is optimized for browsers.
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It comes with a reduced and preloaded stdlib without tests and threading
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support. The ``Emscripten/node`` target has threading enabled and can
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access the file system directly.
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Cross compiling to the wasm32-emscripten platform needs the
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[Emscripten](https://emscripten.org/) SDK and a build Python interpreter.
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Emscripten 3.1.8 or newer are recommended. All commands below are relative
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### Cross compile to wasm32-emscripten for node
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```
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```shell
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mkdir -p builddir/emscripten-node
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pushd builddir/emscripten-node
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popd
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```
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```
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```shell
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node --experimental-wasm-threads --experimental-wasm-bulk-memory builddir/emscripten-node/python.js
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```
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@ -150,9 +156,9 @@ ## Misc
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- Most stdlib modules with a dependency on external libraries are missing,
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e.g. ``ctypes``, ``readline``, ``sqlite3``, ``ssl``, and more.
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- Shared extension modules are not implemented yet. All extension modules
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are statically linked into the main binary.
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The experimental configure option ``--enable-wasm-dynamic-linking`` enables
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dynamic extensions.
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are statically linked into the main binary. The experimental configure
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option ``--enable-wasm-dynamic-linking`` enables dynamic extensions
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supports. It's currently known to crash in combination with threading.
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- glibc extensions for date and time formatting are not available.
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- ``locales`` module is affected by musl libc issues,
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[bpo-46390](https://bugs.python.org/issue46390).
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@ -167,8 +173,10 @@ ## wasm32-emscripten in browsers
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distutils, multiprocessing, dbm, tests and similar modules
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are not shipped. All other modules are bundled as pre-compiled
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``pyc`` files.
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- Threading is not supported.
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- Threading is disabled.
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- In-memory file system (MEMFS) is not persistent and limited.
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- Test modules are disabled by default. Use ``--enable-test-modules`` build
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test modules like ``_testcapi``.
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## wasm32-emscripten in node
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@ -205,11 +213,17 @@ # .htaccess
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</IfModule>
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```
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# WASI (wasm32-wasi)
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WASI builds require [WASI SDK](https://github.com/WebAssembly/wasi-sdk) and
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currently [wasix](https://github.com/singlestore-labs/wasix) for POSIX
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compatibility stubs.
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# Detect WebAssembly builds
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## Python code
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```# python
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```python
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import os, sys
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if sys.platform == "emscripten":
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@ -222,7 +236,36 @@ ## Python code
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# Windows does not provide os.uname().
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machine = os.uname().machine
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if machine.startswith("wasm"):
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# WebAssembly (wasm32 or wasm64)
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# WebAssembly (wasm32, wasm64 in the future)
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```
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```python
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>>> import os, sys
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>>> os.uname()
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posix.uname_result(sysname='Emscripten', nodename='emscripten', release='1.0', version='#1', machine='wasm32')
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>>> os.name
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'posix'
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>>> sys.platform
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'emscripten'
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>>> sys._emscripten_info
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sys._emscripten_info(
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emscripten_version=(3, 1, 8),
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runtime='Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/99.0',
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pthreads=False,
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shared_memory=False
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)
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>>> sys._emscripten_info
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sys._emscripten_info(emscripten_version=(3, 1, 8), runtime='Node.js v14.18.2', pthreads=True, shared_memory=True)
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```
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```python
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>>> import os, sys
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>>> os.uname()
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posix.uname_result(sysname='wasi', nodename='(none)', release='0.0.0', version='0.0.0', machine='wasm32')
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>>> os.name
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'posix'
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>>> sys.platform
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'wasi'
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```
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## C code
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@ -231,7 +274,7 @@ ## C code
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full list of built-ins with ``emcc -dM -E - < /dev/null`` and
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``/path/to/wasi-sdk/bin/clang -dM -E - < /dev/null``.
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```# C
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```C
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#ifdef __EMSCRIPTEN__
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// Python on Emscripten
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#endif
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108
configure
generated
vendored
108
configure
generated
vendored
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@ -10513,6 +10513,9 @@ then
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BLDSHARED="$LDSHARED"
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fi
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;;
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Emscripten|WASI)
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LDSHARED='$(CC) -shared'
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LDCXXSHARED='$(CXX) -shared';;
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Linux*|GNU*|QNX*|VxWorks*|Haiku*)
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LDSHARED='$(CC) -shared'
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LDCXXSHARED='$(CXX) -shared';;
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@ -22374,14 +22377,14 @@ $as_echo "$TEST_MODULES" >&6; }
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# stdlib not available
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case $ac_sys_system/$ac_sys_emscripten_target in #(
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AIX/*) :
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case $ac_sys_system in #(
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AIX) :
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py_cv_module__scproxy=n/a
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py_cv_module_spwd=n/a
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;; #(
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VxWorks*/*) :
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VxWorks*) :
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py_cv_module__scproxy=n/a
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|
@ -22389,103 +22392,72 @@ case $ac_sys_system/$ac_sys_emscripten_target in #(
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py_cv_module_termios=n/a
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py_cv_module_grp=n/a
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;; #(
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Darwin/*) :
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Darwin) :
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py_cv_module_ossaudiodev=n/a
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py_cv_module_spwd=n/a
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;; #(
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CYGWIN*/*) :
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CYGWIN*) :
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py_cv_module__scproxy=n/a
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py_cv_module_nis=n/a
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;; #(
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QNX*/*) :
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QNX*) :
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py_cv_module__scproxy=n/a
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py_cv_module_nis=n/a
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;; #(
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FreeBSD*/*) :
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FreeBSD*) :
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py_cv_module__scproxy=n/a
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py_cv_module_spwd=n/a
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;; #(
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Emscripten|WASI) :
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py_cv_module__curses=n/a
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py_cv_module__curses_panel=n/a
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py_cv_module__dbm=n/a
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py_cv_module__gdbm=n/a
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py_cv_module__multiprocessing=n/a
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py_cv_module__posixshmem=n/a
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py_cv_module__posixsubprocess=n/a
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py_cv_module__scproxy=n/a
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py_cv_module__tkinter=n/a
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py_cv_module__xxsubinterpreters=n/a
|
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py_cv_module_grp=n/a
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py_cv_module_nis=n/a
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py_cv_module_ossaudiodev=n/a
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py_cv_module_pwd=n/a
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py_cv_module_spwd=n/a
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py_cv_module_syslog=n/a
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py_cv_module_=n/a
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case $ac_sys_system/$ac_sys_emscripten_target in #(
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Emscripten/browser*) :
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py_cv_module__ctypes=n/a
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py_cv_module__curses=n/a
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py_cv_module__curses_panel=n/a
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py_cv_module__dbm=n/a
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py_cv_module__gdbm=n/a
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py_cv_module__multiprocessing=n/a
|
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py_cv_module__posixshmem=n/a
|
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py_cv_module__posixsubprocess=n/a
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py_cv_module__scproxy=n/a
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py_cv_module__tkinter=n/a
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py_cv_module__xxsubinterpreters=n/a
|
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py_cv_module_fcntl=n/a
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py_cv_module_grp=n/a
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py_cv_module_nis=n/a
|
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py_cv_module_ossaudiodev=n/a
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py_cv_module_pwd=n/a
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py_cv_module_resource=n/a
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py_cv_module_readline=n/a
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py_cv_module_spwd=n/a
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py_cv_module_syslog=n/a
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py_cv_module_termios=n/a
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py_cv_module_=n/a
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;; #(
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Emscripten/node*) :
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|
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|
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py_cv_module__ctypes=n/a
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py_cv_module__curses=n/a
|
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py_cv_module__curses_panel=n/a
|
||||
py_cv_module__dbm=n/a
|
||||
py_cv_module__gdbm=n/a
|
||||
py_cv_module__multiprocessing=n/a
|
||||
py_cv_module__posixshmem=n/a
|
||||
py_cv_module__posixsubprocess=n/a
|
||||
py_cv_module__scproxy=n/a
|
||||
py_cv_module__tkinter=n/a
|
||||
py_cv_module__xxsubinterpreters=n/a
|
||||
py_cv_module_grp=n/a
|
||||
py_cv_module_nis=n/a
|
||||
py_cv_module_ossaudiodev=n/a
|
||||
py_cv_module_pwd=n/a
|
||||
py_cv_module_spwd=n/a
|
||||
py_cv_module_syslog=n/a
|
||||
py_cv_module_=n/a
|
||||
|
||||
;; #(
|
||||
;; #(
|
||||
Emscripten/node*) :
|
||||
;; #(
|
||||
WASI/*) :
|
||||
|
||||
|
||||
|
||||
py_cv_module__ctypes=n/a
|
||||
py_cv_module__ctypes_test=n/a
|
||||
py_cv_module__curses=n/a
|
||||
py_cv_module__curses_panel=n/a
|
||||
py_cv_module__dbm=n/a
|
||||
py_cv_module__gdbm=n/a
|
||||
py_cv_module__scproxy=n/a
|
||||
py_cv_module__tkinter=n/a
|
||||
py_cv_module__xxsubinterpreters=n/a
|
||||
py_cv_module_grp=n/a
|
||||
py_cv_module_nis=n/a
|
||||
py_cv_module_ossaudiodev=n/a
|
||||
py_cv_module_pwd=n/a
|
||||
py_cv_module_spwd=n/a
|
||||
py_cv_module_syslog=n/a
|
||||
py_cv_module_=n/a
|
||||
|
||||
;; #(
|
||||
*) :
|
||||
;;
|
||||
esac
|
||||
;; #(
|
||||
*) :
|
||||
|
||||
|
|
81
configure.ac
81
configure.ac
|
@ -2954,6 +2954,9 @@ then
|
|||
BLDSHARED="$LDSHARED"
|
||||
fi
|
||||
;;
|
||||
Emscripten|WASI)
|
||||
LDSHARED='$(CC) -shared'
|
||||
LDCXXSHARED='$(CXX) -shared';;
|
||||
Linux*|GNU*|QNX*|VxWorks*|Haiku*)
|
||||
LDSHARED='$(CC) -shared'
|
||||
LDCXXSHARED='$(CXX) -shared';;
|
||||
|
@ -6585,43 +6588,19 @@ AC_DEFUN([PY_STDLIB_MOD_SET_NA], [
|
|||
dnl Modules that are not available on some platforms
|
||||
dnl AIX has shadow passwords, but access is not via getspent()
|
||||
dnl VxWorks does not provide crypt() function
|
||||
AS_CASE([$ac_sys_system/$ac_sys_emscripten_target],
|
||||
[AIX/*], [PY_STDLIB_MOD_SET_NA([_scproxy], [spwd])],
|
||||
[VxWorks*/*], [PY_STDLIB_MOD_SET_NA([_scproxy], [_crypt], [termios], [grp])],
|
||||
[Darwin/*], [PY_STDLIB_MOD_SET_NA([ossaudiodev], [spwd])],
|
||||
[CYGWIN*/*], [PY_STDLIB_MOD_SET_NA([_scproxy], [nis])],
|
||||
[QNX*/*], [PY_STDLIB_MOD_SET_NA([_scproxy], [nis])],
|
||||
[FreeBSD*/*], [PY_STDLIB_MOD_SET_NA([_scproxy], [spwd])],
|
||||
[Emscripten/browser*], [
|
||||
AS_CASE([$ac_sys_system],
|
||||
[AIX], [PY_STDLIB_MOD_SET_NA([_scproxy], [spwd])],
|
||||
[VxWorks*], [PY_STDLIB_MOD_SET_NA([_scproxy], [_crypt], [termios], [grp])],
|
||||
[Darwin], [PY_STDLIB_MOD_SET_NA([ossaudiodev], [spwd])],
|
||||
[CYGWIN*], [PY_STDLIB_MOD_SET_NA([_scproxy], [nis])],
|
||||
[QNX*], [PY_STDLIB_MOD_SET_NA([_scproxy], [nis])],
|
||||
[FreeBSD*], [PY_STDLIB_MOD_SET_NA([_scproxy], [spwd])],
|
||||
[Emscripten|WASI], [
|
||||
dnl subprocess and multiprocessing are not supported (no fork syscall).
|
||||
dnl curses and tkinter user interface are not available.
|
||||
dnl dbm and gdbm aren't available, too.
|
||||
dnl Emscripten and WASI provide only stubs for pwd, grp APIs.
|
||||
PY_STDLIB_MOD_SET_NA(
|
||||
[_ctypes],
|
||||
[_curses],
|
||||
[_curses_panel],
|
||||
[_dbm],
|
||||
[_gdbm],
|
||||
[_multiprocessing],
|
||||
[_posixshmem],
|
||||
[_posixsubprocess],
|
||||
[_scproxy],
|
||||
[_tkinter],
|
||||
[_xxsubinterpreters],
|
||||
[fcntl],
|
||||
[grp],
|
||||
[nis],
|
||||
[ossaudiodev],
|
||||
[pwd],
|
||||
[resource],
|
||||
[readline],
|
||||
[spwd],
|
||||
[syslog],
|
||||
[termios],
|
||||
)
|
||||
],
|
||||
dnl Some modules like _posixsubprocess do not work. We build them anyway
|
||||
dnl so imports in tests do not fail.
|
||||
[Emscripten/node*], [
|
||||
PY_STDLIB_MOD_SET_NA(
|
||||
[_ctypes],
|
||||
[_curses],
|
||||
[_curses_panel],
|
||||
[_dbm],
|
||||
|
@ -6639,24 +6618,18 @@ AS_CASE([$ac_sys_system/$ac_sys_emscripten_target],
|
|||
[spwd],
|
||||
[syslog],
|
||||
)
|
||||
],
|
||||
[WASI/*], [
|
||||
PY_STDLIB_MOD_SET_NA(
|
||||
[_ctypes],
|
||||
[_ctypes_test],
|
||||
[_curses],
|
||||
[_curses_panel],
|
||||
[_dbm],
|
||||
[_gdbm],
|
||||
[_scproxy],
|
||||
[_tkinter],
|
||||
[_xxsubinterpreters],
|
||||
[grp],
|
||||
[nis],
|
||||
[ossaudiodev],
|
||||
[pwd],
|
||||
[spwd],
|
||||
[syslog],
|
||||
AS_CASE([$ac_sys_system/$ac_sys_emscripten_target],
|
||||
[Emscripten/browser*], [
|
||||
dnl These modules are not particularly useful in browsers.
|
||||
PY_STDLIB_MOD_SET_NA(
|
||||
[fcntl],
|
||||
[resource],
|
||||
[readline],
|
||||
[termios],
|
||||
)
|
||||
],
|
||||
[Emscripten/node*], [],
|
||||
[WASI/*], []
|
||||
)
|
||||
],
|
||||
[PY_STDLIB_MOD_SET_NA([_scproxy])]
|
||||
|
|
Loading…
Reference in a new issue