Fortran Defaults (Debugging with GDB)

From Get docs
Gdb/docs/latest/gdb/Fortran-Defaults


15.4.6.2 Fortran Defaults

Fortran symbols are usually case-insensitive, so GDB by default uses case-insensitive matches for Fortran symbols. You can change that with the ‘set case-insensitive’ command, see Symbols, for the details.