If one tries to compile a simple Fortran file (e.g.: "end") with:
$ gfortran -flto -fdump-core test.f90 lto1: error: unrecognized command line option "-fdump-core" -- Summary: lto1 rejects -fdump-core option of gfortran Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: burnus at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42675