https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101827
Bug ID: 101827
Summary: Wrong stringop-overflow warning
Product: gcc
Version: 10.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: jellby at yahoo dot com
Target Milestone: ---
When trying to compile OpenMolcas with gcc 10.1 and link-time optimization I
get:
../src/slapaf_util/outofplane_list.f: In function ‘outofplane_list’:
../src/slapaf_util/outofplane_list.f:524: error: writing 1 byte into a region
of size 0 [-Werror=stringop-overflow=]
524 | Lbls(3)(iE3+1:iE3+1)='('
|
../src/slapaf_util/outofplane_list.f:45:32: note: at offset 0 to object ‘lbls’
with size 40 declared here
45 | Character*(LENIN4) Lbls(4)
| ^
[...]
lto1: all warnings being treated as errors
lto-wrapper: fatal error: /usr/bin/gfortran returned 1 exit status
How is "Lbls(3)(iE3+1:iE3+1)" a region of size 0? Similar constructs elsewhere
don't raise the flag. Does the compiler believe "iE3+1" is beyond the length of
the string? But then it says nothing without -flto.
