https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65026
Bug ID: 65026 Summary: Internal compiler error with preprocessor in gfortran Product: gcc Version: 4.9.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: fkrogh#gcc at mathalacarte dot com Compile the attached with gfortran -Dplet_=\'d\' -g -o test test.F90 or replace the d with s, q, or nonsense. The kind of preprocessor code used here seems to be handled just fine in the case of C code for gcc.