https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105503
Bug ID: 105503
Summary: vptr and data are uninitialised error for intent(out)
argument of abstract type
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: mscfd at gmx dot net
Target Milestone: ---
Created attachment 52932
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52932&action=edit
uninit_vptr
The attached module, compiled with
gfortran-12 -Wall uninit_vptr.f90 -c
gives
uninit_vptr.f90:34:19:
34 | call f%sub(x)
| ^
Warning: ‘x._data’ is used uninitialized [-Wuninitialized]
uninit_vptr.f90:33:42:
33 | class(a), dimension(:), pointer :: x
| ^
note: ‘x’ declared here
uninit_vptr.f90:34:19:
34 | call f%sub(x)
| ^
Warning: ‘x._vptr’ is used uninitialized [-Wuninitialized]
uninit_vptr.f90:33:42:
33 | class(a), dimension(:), pointer :: x
| ^
note: ‘x’ declared here
But argument x has the intent(out) attribute and the warning seems bogus. (The
original code, where this occured, is an implementation of the abstract factory
design pattern.)
