[issue43030] signed/unsigned mismatch in Py_UNICODE_ISSPACE macro

[Matthias Klose]

New submission from Matthias Klose <doko at debian.org>:

[forwarded from https://bugs.debian.org/961396]

$ cat > foo.c
#include <Python.h>

int main(int argc, char *argv[])
{
        Py_UNICODE x = 0;

        return Py_UNICODE_ISSPACE(x);
}

$ gcc -Wsign-compare -Werror $(pkg-config --cflags python3) foo.c
In file included from /usr/include/python3.9/unicodeobject.h:1026,
                 from /usr/include/python3.9/Python.h:97,
                 from foo.c:1:
foo.c: In function ‘main’:
/usr/include/python3.9/cpython/unicodeobject.h:25:11: error: comparison of integer expressions of different signedness: ‘Py_UNICODE’ {aka ‘int’} and ‘unsigned int’ [-Werror=sign-compare]
   25 |     ((ch) < 128U ? _Py_ascii_whitespace[(ch)] : _PyUnicode_IsWhitespace(ch))
      |           ^
foo.c:7:16: note: in expansion of macro ‘Py_UNICODE_ISSPACE’
    7 |         return Py_UNICODE_ISSPACE(x);
      |                ^~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

----------
components: Extension Modules
messages: 385707
nosy: doko
priority: normal
severity: normal
status: open
title: signed/unsigned mismatch in Py_UNICODE_ISSPACE macro
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43030>
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