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-x <xref-hints> option
The (language-specific) code for indexing
and/or cross-referencing the code in the document is passed the
<xref-hints> to further control how things are done.
A general one you can use is `-x noindex', to turn off code
indexing.
These hints, if any, will be mentioned in the documentation of
language-specific processing (Section See Language_specific).
An example might be using `-l cpp -x extra:make' on the
configuration files for `jmake'. These files have both C
pre-processor and `make' things worthy of
indexing/cross-referencing, and these options would ensure that the
code was put through the appropriate routines for both languages.