https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78398
Bug ID: 78398
Summary: missing warnings and inconsistencies with
-Wuninitialized
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: janus at gcc dot gnu.org
Target Milestone: ---
Please consider the following example:
subroutine s1
integer :: i,j
j = i ! warning here
print *,i ! none here
end
module m
contains
subroutine s2
integer :: i,j
j = i ! warning here
print *,i ! none here
end
end module
program p
contains
subroutine s3
integer :: i,j
j = i ! none here
print *,i ! none here
end
end
Compiling this with -Wuninitialized correctly produces two warnings on the
marked lines (with gfortran 5, 6 and trunk), but four warnings are missing.
Two things are inconsistent here:
1) The subroutines s1,s2,s3 are completely identical. If the routine is
alone-standing or inside a module, we get a warning. But if it is contained in
a program, the warning is gone.
2) We get a warning when an uninitialized variable is used in an assignment,
but not in a print statement.
