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9.1.1 List of filename extensions and languages

If a source file name ends in one of the following extensions, then GDB infers that its language is the one indicated.

`.c'

C source file

`.C'

`.cc'

`.cp'

`.cpp'

`.cxx'

`.c++'

C++ source file

`.f'

`.F'

Fortran source file

`.ch'

`.c186'

`.c286'

CHILL source file

`.mod'

Modula-2 source file

`.s'

`.S'

Assembler source file. This actually behaves almost like C, but GDB does not skip over function prologues when stepping.

In addition, you may set the language associated with a filename extension. See section Displaying the language.