Having GDB infer the source language
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   To have GDB set the working language automatically, use `set
language local' or `set language auto'.  GDB then infers the working
language.  That is, when your program stops in a frame (usually by
encountering a breakpoint), GDB sets the working language to the
language recorded for the function in that frame.  If the language for
a frame is unknown (that is, if the function or block corresponding to
the frame was defined in a source file that does not have a recognized
extension), the current working language is not changed, and GDB issues
a warning.

   This may not seem necessary for most programs, which are written
entirely in one source language.  However, program modules and libraries
written in one source language can be used by a main program written in
a different source language.  Using `set language auto' in this case
frees you from having to set the working language manually.