https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101919
Bug ID: 101919
Summary: Inconsistent -Wstringop-overread warning with -flto
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: rimvydas.jas at gmail dot com
Target Milestone: ---
$ cat gl_test.f90
program foo
implicit none
character(len=100) :: c =' '
if (c(1:12) == 'Accumulated ') c = c(13:len_trim(c))
end program
$ gfortran -Wall -Wextra gl_test.f90
$ gfortran -Wall -Wextra -flto gl_test.f90
gl_test.f90: In function 'foo':
gl_test.f90:4:52: warning: '__builtin_memmove' reading 100 bytes from a region
of size 88 [-Wstringop-overread]
4 | if (c(1:12) == 'Accumulated ') c = c(13:len_trim(c))
| ^
gl_test.f90:3:23: note: at offset 12 into source object 'c' of size 100
3 | character(len=100) :: c =' '
| ^
