New submission from Henry Schreiner <henryschreiner...@gmail.com>:
The macro Py_UNICODE_COPY was replaced by a function in CPython 3.9, and that
function cannot compile with full warnings enabled + warnings as errors under
Clang. The problematic line:
Py_DEPRECATED(3.3) static inline void
Py_UNICODE_COPY(Py_UNICODE *target, const Py_UNICODE *source, Py_ssize_t
length) {
memcpy(target, source, length * sizeof(Py_UNICODE));
}
has an implicit conversion of Py_ssize_t into size_t, which creates:
/Users/runner/hostedtoolcache/Python/3.9.0-beta.5/x64/include/python3.9/cpython/unicodeobject.h:55::
implicit conversion changes signedness: 'Py_ssize_t' (aka 'long') to 'unsigned
long' [-Werror,-Wsign-conversion]
error: implicit conversion changes signedness: 'Py_ssize_t' (aka 'long') to
'unsigned long' [-Werror,-Wsign-conversion]
memcpy(target, source, length * sizeof(Py_UNICODE)); memcpy(target,
source, length * sizeof(Py_UNICODE));
An explicit cast to size_t (is there a Py_size_t?) should be made.
----------
components: C API
messages: 374084
nosy: Henry Schreiner
priority: normal
severity: normal
status: open
title: sign-conversion warning in 3.9 beta
type: compile error
versions: Python 3.10, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41366>
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