https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92422
Bug ID: 92422
Summary: Warning with character and optimisation flags
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: moad212 at hotmail dot com
Target Milestone: ---
When I compile the Fortran test program:
***
PROGRAM character_warning
CHARACTER(len=16) :: word
word = 'hi'
WRITE(*,*) word
END PROGRAM character_warning
***
with 'gfortran -Warray-bounds -O2 character_warning.f90', I get a warning:
***
character_warning.f90:5:0:
5 | word = 'hi'
|
Warning: array subscript 0 is outside array bounds of 'character(kind=1)[1:16]'
[-Warray-bounds]
character_warning.f90:3:0:
3 | CHARACTER(len=16) :: word
|
note: while referencing 'word'
***
This only started to happened when I upgraded to gfortran9 from gfortran8. I
don't understand why the warning is being thrown and would like to remove it so
that my compilation is clean. The warning goes away if I lower the optimisation
to -O1 or if I remove the -Warray-bounds flag (maybe obviously).
I posted about this on stackoverflow here:
https://stackoverflow.com/questions/58752319/array-bounds-warning-with-character-in-gfortran
