[Bug gdb/27681] FAIL: gdb.base/help.exp: apropos \(print[^[ bsiedf\".-]\) (timeout)

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27681

--- Comment #20 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Michael Matz from comment #15)
> (Sidenote: I think there's no conforming possiblity to use the GNU extension
> correctly without leaks, because there's no GNU extension equivalent of
> regfree,
> ala re_free or somesuch).

I did some further investigation, and have started to suspect that the reason
why the regex GNU extensions in glibc are so poorly documented, is because
they're documented at gnulib.

And at gnulib docs (
https://www.gnu.org/software/gnulib/manual/html_node/Freeing-GNU-Pattern-Buffers.html#Freeing-GNU-Pattern-Buffers
) I read:
...
To free any allocated fields of a pattern buffer, use the POSIX function
regfree:

void
regfree (regex_t *preg)

preg is the pattern buffer whose allocated fields you want freed; this works
because since the type regex_t—the type for POSIX pattern buffers—is equivalent
to the type re_pattern_buffer. 
...

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