[Bug fortran/85742] New: sizeof allocatable arrays returning wrong value

[cesar at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85742

            Bug ID: 85742
           Summary: sizeof allocatable arrays returning wrong value
           Product: gcc
           Version: 8.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cesar at gcc dot gnu.org
  Target Milestone: ---

Created attachment 44113
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44113&action=edit
sizeof test

As of trunk revision 257065, the sizeof function is returning incorrect results
on assume-sized allocated arrays and scalars. See the attached test case for
more details.

I hit this problem while rebasing openacc-gcc-7-branch Fortran changes to GCC
8. Basically, OpenACC provides a Fortran module which contains an
acc_is_present routine, which passes the sizeof an array along with the pointer
to the array to the runtime to determine if that array is resident on the
device. However, now sizeof is returning bogus results.