Whoops, where has the preprocessing option gone, used to be -cpp ?? Neither does the -traditional-cpp option work for the fortran front end.
>gfortran -cpp gfortran unrecognized option »-cpp« > gfortran -v testcase_preprocess.f90 .Warning: testcase_preprocess.f90:16: Illegal preprocessor directive In file testcase_preprocess.f90:15 real :: value=0.0E0 1 Error: Symbol 'value' at (1) already has basic type of REAL !------------------------------------------------------------------ program test #ifdef DOUBLE double precision :: value=0.0D0 #else real :: value=0.0E0 #endif end program test -- Summary: No preprocessing option -cpp for gfortran Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: c dot lemmen at fz-juelich dot de CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18428