[Bug fortran/98408] New: Character lengths for allocatable character arrays

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98408

            Bug ID: 98408
           Summary: Character lengths for allocatable character arrays
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tkoenig at gcc dot gnu.org
  Target Milestone: ---

Consider

program main
  character (len=:), allocatable :: a(:)
  allocate (character(len=10) :: a(5))
end program main

This yields (in the tree dump)

  D.3941 = (bitsizetype) (sizetype) NON_LVALUE_EXPR <.a> * 8;
  D.3942 = (sizetype) NON_LVALUE_EXPR <.a>;
  a.data = 0B;
  {
    integer(kind=4) overflow.0;
    logical(kind=4) not_prev_allocated.1;

    .a = 10;

And later, if you use

size_in_bytes (gfc_get_element_type (TREE_TYPE(se->expr)))

you get an undefined variable.

Strange...