[Bug fortran/58002] New: [IR tracking] Pointer function results in non pointer context: Shall use a temporary

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58002

            Bug ID: 58002
           Summary: [IR tracking] Pointer function results in non pointer
                    context: Shall use a temporary
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org

If "fx()" is a pointer returning function, "fx()" is an expression. Hence, for
   call foo(fx())
the argument should be not the pointer address of fx() but a temporary with the
value of the function result.

Everything becomes messier with Fortran 2008 as calls to pointer-returning
functions count as variables.

gfortran currently does not create a temporary in line with Fortran 2008 (!),
but it should to conform to Fortran 90/95/2003.

See Interpretation Request F08/0089 at
http://www.j3-fortran.org/doc/year/13/13-006Ar1.txt - but also at the
discussion at http://mailman.j3-fortran.org/pipermail/j3/2013-July/006578.html