https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91752
Bug ID: 91752 Summary: BOZ constant outside DATA/INT/REAL/DBLE/CMPLX flagged as error Product: gcc Version: 10.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: juergen.reuter at desy dot de Target Milestone: --- nagfor and ifort do not flag this as an error, but only warn as an extension: program main implicit none integer :: h h = B"11" end program main This has been introduced into gfortran 10 very recently, but breaks many running codes. Wouldn't you mind turning this into a warning?