https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85651
Bug ID: 85651
Summary: Invalid -Warray-bounds warning with -O3
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gburca-gnu at ebixio dot com
Target Milestone: ---
Created attachment 44069
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44069&action=edit
Code demonstrating issue
https://godbolt.org/g/LmJDVa
When compiled with g++ 8.1.0 and "-c -std=gnu++17 -Wall -Werror -O3" the
attached code (alternatively, see link above) issues the following array-bounds
warning. Furthermore, the warning can not be ignored with diagnostic pragmas.
cc1plus: error: ‘void* __builtin_memcpy(void*, const void*, long unsigned int)’
offset [-9223372036854775799, -9223372036854775801] is out of the bounds [0,
128] of object ‘logBuilder’ with type ‘LogBuilder’ [-Werror=array-bounds]
Ways to make the warning go away include:
- Compiling with -O2
- Changing the "ptr_" type to size_t
No warning is issued when compiled with 7.3.
