If you allow GDB to set type and range checking automatically, they
both default to
off whenever the working language changes to
C or C++. This happens regardless of whether you or GDB
selects the working language.
If you allow GDB to set the language automatically, it recognizes source files whose names end with `.c', `.C', or `.cc', etc, and when GDB enters code compiled from one of these files, it sets the working language to C or C++. See section Having GDB infer the source language, for further details.
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