With a recent gfortran, the following compiles, but generates the wrong results:
SUBROUTINE S1(I,J) character(len=I-J) :: a IF (LEN(a)<0) CALL ABORT() END SUBROUTINE CALL S1(1,2) END -- Summary: wrong code generated with gfortran Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: jv244 at cam dot ac dot uk http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31208