./Modules/_io/fileio.c:175:9: warning: ‘exc’ may be used uninitialized [-Wmaybe-uninitialized]

[mcepl]

cpython/Modules/_io/fileio.c

Lines 160 to 176 in d207c7c

	PyObject *exc = NULL;
	if (res == NULL) {
	exc = PyErr_GetRaisedException();
	}
	if (self->finalizing) {
	PyObject *r = fileio_dealloc_warn(self, (PyObject *) self);
	if (r) {
	Py_DECREF(r);
	}
	else {
	PyErr_Clear();
	}
	}
	rc = internal_close(self);
	if (res == NULL) {
	_PyErr_ChainExceptions1(exc);
	}

When building Python 3.13.0a3 for openSUSE/Tumbleweed, we get this in the build log:

[  112s] make[2]: Entering directory '/home/abuild/rpmbuild/BUILD/Python-3.13.0a3'
[  112s] gcc -I./Modules/_io -fno-strict-overflow -Wsign-compare -DNDEBUG -march=x86-64-v3 -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type  -g -DOPENSSL_LOAD_CONF -fwrapv  -fno-semantic-interposition -march=x86-64-v3 -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type  -g -IVendor/ -march=x86-64-v3 -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type  -g -IVendor/  -fno-semantic-interposition -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden -fprofile-generate -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include   -fPIC -DPy_BUILD_CORE_BUILTIN -c ./Modules/_io/fileio.c -o Modules/_io/fileio.o
[  112s] In function ‘_io_FileIO_close_impl’,
[  112s]     inlined from ‘_io_FileIO_close’ at ./Modules/_io/clinic/fileio.c.h:34:12:
[  112s] ./Modules/_io/fileio.c:175:9: warning: ‘exc’ may be used uninitialized [-Wmaybe-uninitialized]
[  112s]   175 |         _PyErr_ChainExceptions1(exc);
[  112s]       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
[  112s] ./Modules/_io/fileio.c: In function ‘_io_FileIO_close’:
[  112s] ./Modules/_io/fileio.c:160:15: note: ‘exc’ was declared here
[  112s]   160 |     PyObject *exc;
[  112s]       |               ^~~
[  112s] make[2]: Leaving directory '/home/abuild/rpmbuild/BUILD/Python-3.13.0a3'

(Complete build log)

[sobolevn]

Isn't it a duplicate of #114286?
If it is, then it will be fixed in https://github.com/python/cpython/releases/tag/v3.13.0a4

Can you please confirm?

[mcepl]

Yes, it is. _PyErr_ChainExceptions1 can get NULL parameter, and it would be the only difference between my solution and the one in #114286.