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Several approaches were discussed (mail or irc) to verify the invariants of
the GDB help documentation : checking with apropos ., modifying add_cmd
to do the check and output a warning, implement maintenance check-doc.
A selftest was finally chosen as:
* this can be run on demand, including by users if they want
to check user defined commands.
* it does not interact with the normal behaviour of apropos, define,
python, ...
(such as output warnings when a user defines a command help that
does not respect the doc).
* when the selftest runs, it checks the user defined and python
defined commands currently defined.
gdb/ChangeLog
* unittests/help-doc-selftests.c: New file.
* Makefile.in: Add the new file.
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