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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/107087] New: bits/stl_algobase.h:431: warning: 'void* __builtin_memcpy(void*, const void*, unsigned int)' reading between 8 and 2147483644 bytes from a region of size 4 [-Wstringop-overread] Date: Thu, 29 Sep 2022 14:35:46 +0000 [thread overview] Message-ID: <bug-107087-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107087 Bug ID: 107087 Summary: bits/stl_algobase.h:431: warning: 'void* __builtin_memcpy(void*, const void*, unsigned int)' reading between 8 and 2147483644 bytes from a region of size 4 [-Wstringop-overread] Product: gcc Version: 12.2.1 Status: UNCONFIRMED Keywords: diagnostic Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: redi at gcc dot gnu.org Target Milestone: --- Target: i?86-pc-linux-gnu Created attachment 53640 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53640&action=edit Gzipped preprocessed output There are bogus warnings when compiling the attached file using: g++ -O2 3.ii -m32 -c /usr/include/c++/12/bits/stl_algobase.h:431:30: warning: ‘void* __builtin_memcpy(void*, const void*, unsigned int)’ reading between 8 and 2147483644 bytes from a region of size 4 [-Wstringop-overread] 431 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num); | ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/12/bits/stl_algobase.h:431:30: warning: ‘void* __builtin_memcpy(void*, const void*, unsigned int)’ reading between 8 and 2147483644 bytes from a region of size 4 [-Wstringop-overread] 431 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num); | ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The warnings are still there on trunk, but -Warray-bounds instead of -Wstringop-overread.
next reply other threads:[~2022-09-29 14:35 UTC|newest] Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-29 14:35 redi at gcc dot gnu.org [this message] 2023-03-09 20:48 ` [Bug tree-optimization/107087] " redi at gcc dot gnu.org 2023-03-09 20:49 ` [Bug tree-optimization/107087] [13 Regression] " redi at gcc dot gnu.org 2023-03-15 10:00 ` rguenth at gcc dot gnu.org 2023-03-27 13:00 ` rguenth at gcc dot gnu.org 2023-03-27 13:52 ` rguenth at gcc dot gnu.org 2023-03-27 14:00 ` redi at gcc dot gnu.org 2023-03-28 13:25 ` cvs-commit at gcc dot gnu.org 2023-03-28 13:26 ` rguenth at gcc dot gnu.org 2023-03-30 8:31 ` redi at gcc dot gnu.org 2023-03-31 11:36 ` [Bug tree-optimization/107087] [12/13 " rguenth at gcc dot gnu.org 2023-03-31 11:55 ` redi at gcc dot gnu.org 2023-03-31 12:43 ` redi at gcc dot gnu.org 2023-03-31 22:45 ` cvs-commit at gcc dot gnu.org 2023-03-31 23:25 ` [Bug tree-optimization/107087] [12 " redi at gcc dot gnu.org 2023-04-27 11:50 ` rguenth at gcc dot gnu.org 2023-04-27 12:00 ` redi at gcc dot gnu.org 2023-04-29 0:41 ` sjames at gcc dot gnu.org 2023-04-29 6:56 ` redi at gcc dot gnu.org 2023-04-29 7:02 ` sjames at gcc dot gnu.org 2023-05-08 12:25 ` rguenth at gcc dot gnu.org
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