|Debugging with GDB: M2 Defaults|
If type and range checking are set automatically by GDB, they
both default to
on whenever the working language changes to
Modula-2. This happens regardless of whether you or GDB
selected the working language.
If you allow GDB to set the language automatically, then entering code compiled from a file whose name ends with .mod sets the working language to Modula-2. See Having GDB Infer the Source Language, for further details.