With a recent gfortran, the following compiles, but generates the wrong results:
call s(-3) call s(2**18) contains subroutine s(i) character(LEN=I) a IF(LEN(a).NE.MAX(0,I)) CALL ABORT() end subroutine 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=31203