gdb: Automatically
15.1.3 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.
Info Catalog
gdb: Manually
gdb: Setting