Warnings on the current main branch #108562
Description
Bug report
CPython versions tested on:
CPython main branch
Operating systems tested on:
Linux
Output from running 'python -VV' on the command line:
Python 3.13.0a0 (main, Aug 28 2023, 13:54:29) [GCC 12.2.0]
A clear and concise description of the bug:
With
$ # Mon Aug 28 13:44:26 MSK 2023
$ wget https://github.com/python/cpython/archive/refs/heads/main.zip
$ unzip -x main.zip
$ cd cpython-main/
$ ./configure -q && make -sBuild is successful, but I see a bunch of warnings:
In function ‘_io_FileIO_close_impl’,
inlined from ‘_io_FileIO_close’ at ./Modules/_io/clinic/fileio.c.h:34:12:
./Modules/_io/fileio.c:170:9: warning: ‘exc’ may be used uninitialized [-Wmaybe-uninitialized]
170 | _PyErr_ChainExceptions1(exc);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
./Modules/_io/fileio.c: In function ‘_io_FileIO_close’:
./Modules/_io/fileio.c:155:15: note: ‘exc’ was declared here
155 | PyObject *exc;
| ^~~
Note: Deepfreeze may have added some global objects,
so run 'make regen-global-objects' if necessary.
In function ‘word_to_string’,
inlined from ‘coeff_to_string’ at ./Modules/_decimal/libmpdec/io.c:410:13,
inlined from ‘_mpd_to_string’ at ./Modules/_decimal/libmpdec/io.c:611:18:
./Modules/_decimal/libmpdec/io.c:348:40: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
348 | if (s == dot) *s++ = '.'; *s++ = '0' + (char)(x / d); x %= d
| ~~~~~^~~~~~~~~~~~~~~~~~~~~
./Modules/_decimal/libmpdec/io.c:359:14: note: in expansion of macro ‘EXTRACT_DIGIT’
359 | case 15: EXTRACT_DIGIT(s, x, 100000000000000ULL, dot);
| ^~~~~~~~~~~~~
./Modules/_decimal/libmpdec/io.c:348:40: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
348 | if (s == dot) *s++ = '.'; *s++ = '0' + (char)(x / d); x %= d
| ~~~~~^~~~~~~~~~~~~~~~~~~~~
./Modules/_decimal/libmpdec/io.c:360:14: note: in expansion of macro ‘EXTRACT_DIGIT’
360 | case 14: EXTRACT_DIGIT(s, x, 10000000000000ULL, dot);
| ^~~~~~~~~~~~~
./Modules/_decimal/libmpdec/io.c:348:40: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
348 | if (s == dot) *s++ = '.'; *s++ = '0' + (char)(x / d); x %= d
| ~~~~~^~~~~~~~~~~~~~~~~~~~~
./Modules/_decimal/libmpdec/io.c:361:14: note: in expansion of macro ‘EXTRACT_DIGIT’
361 | case 13: EXTRACT_DIGIT(s, x, 1000000000000ULL, dot);
| ^~~~~~~~~~~~~
[...]
N.B. second type of warnings (expansions of EXTRACT_DIGIT) seems to be related to the gcc-12. The first I've seen on the Debian Buster (with gcc-10 per default).