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gh-144278: Enable overriding sys.implementation's name and cache_tag when building sysmodule.c (GH-144293)

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Changing the values requires forking and patching, which is intentional. Simply rebuilding from source does not change the implementation enough to justify changing these values - they would still be `cpython` and compatible with existing `.pyc` files. But people who maintain forks are better served by being able to easily override these values in a place that can be forward-ported reliably.
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Steve Dower 2026-02-10 00:01:17 +00:00 • committed by GitHub
parent 30cfe6ee23
commit a9b6788ae6
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29 changed files with 305 additions and 189 deletions
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25
Python/sysmodule.c
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@ -3568,16 +3568,22 @@ make_version_info(PyThreadState *tstate)
}
/* sys.implementation values */
#define NAME "cpython"
const char *_PySys_ImplName = NAME;
#ifndef _PY_IMPL_NAME
#define _PY_IMPL_NAME "cpython"
#endif
const char *_PySys_ImplName = _PY_IMPL_NAME;
#ifndef _PY_IMPL_CACHE_TAG
#define MAJOR Py_STRINGIFY(PY_MAJOR_VERSION)
#define MINOR Py_STRINGIFY(PY_MINOR_VERSION)
#define TAG NAME "-" MAJOR MINOR
const char *_PySys_ImplCacheTag = TAG;
#undef NAME
#define _PY_IMPL_CACHE_TAG _PY_IMPL_NAME "-" MAJOR MINOR
#endif
const char *_PySys_ImplCacheTag = _PY_IMPL_CACHE_TAG;
#ifdef MAJOR
#undef MAJOR
#endif
#ifdef MINOR
#undef MINOR
#undef TAG
#endif
static PyObject *
make_impl_info(PyObject *version_info)
@ -3599,9 +3605,12 @@ make_impl_info(PyObject *version_info)
if (res < 0)
goto error;
value = PyUnicode_FromString(_PySys_ImplCacheTag);
if (value == NULL)
value = _PySys_ImplCacheTag
? PyUnicode_FromString(_PySys_ImplCacheTag)
: Py_NewRef(Py_None);
if (value == NULL) {
goto error;
}
res = PyDict_SetItemString(impl_info, "cache_tag", value);
Py_DECREF(value);
if (res < 0)