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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,
selected the working language.
If you allow GDB to set the language automatically, it sets the working language to C or C++ on entering code compiled from a source file whose name ends with `.c', `.C', or `.cc'. See section Having GDB infer the source language, for further details.
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