https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101917
Bug ID: 101917
Summary: Spurious -Wstringop-overread with -flto when passing
zero sized arrays
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 bar.c
void bar_(const int flag[], const int *num) { }
$ cat foo.f90
program foo
integer :: idummy(0)
call bar(idummy, 0)
end program
$ gcc -flto -c bar.c
$ gfortran -Wall -Wextra -flto -c foo.f90
$ gfortran -Wall -Wextra -flto foo.o bar.o
foo.f90: In function 'foo':
foo.f90:3:19: warning: 'bar_' reading 4 bytes from a region of size 0
[-Wstringop-overread]
3 | call bar(idummy, 0)
| ^
foo.f90:3:19: note: referencing argument 1 of type 'const int *'
bar.c:1:6: note: in a call to function 'bar_'
1 | void bar_(const int flag[], const int *num) { }
| ^
