https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115771
Bug ID: 115771
Summary: false postiv -Wstringop-overread with -O2
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: Shun.Yao at de dot bosch.com
Target Milestone: ---
Created attachment 58583
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58583&action=edit
example to reproduce the error. compile with -O2
Starting from gccV9, if compiled with -O2 switch, the gcc produce false positiv
stringop-overread warning.
An example to reproduce the error is attached.
it seems the gcc try to optimize the performance by inline memcpy, but it
generate code for memcpy with length of LENGTH. but this scenario will never
happen. it causes only stringop-overread warning
