New submission from tzickel <[email protected]>:
When compiling on ubuntu 18.04 the 2.7 branch, I get this warning:
gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall
-Wstrict-prototypes -I. -IInclude -I./Include -DPy_BUILD_CORE
-DPYTHONPATH='":plat-linux2:lib-tk:lib-old"' \
-DPREFIX='"/usr/local"' \
-DEXEC_PREFIX='"/usr/local"' \
-DVERSION='"2.7"' \
-DVPATH='""' \
-o Modules/getpath.o ./Modules/getpath.c
In file included from /usr/include/string.h:494:0,
from Include/Python.h:38,
from ./Modules/getpath.c:3:
In function 'strncpy',
inlined from 'joinpath' at ./Modules/getpath.c:202:5,
inlined from 'search_for_prefix' at ./Modules/getpath.c:265:9,
inlined from 'calculate_path' at ./Modules/getpath.c:505:8:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:106:10: warning:
'__builtin_strncpy': specified size between 9223372036854779906 and
18446744073709551615 exceeds maximum object size
9223372036854775807 [-Wstringop-overflow=]
return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
^~----
I think it's because the compiler can't reason that Py_FatalError aborts the
program, and thus not overflow strncpy.
Since there are about 3-4 warnings while building, maybe we should add a manual
return after Py_FatalError in joinpath ?
----------
components: Build
messages: 322809
nosy: tzickel
priority: normal
severity: normal
status: open
title: gcc 7.3 causes a warning when compiling getpath.c in python 2.7
versions: Python 2.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue34300>
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