[Bug gdb/31152] Formalise unintened functionality in version 9.1

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31152

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
On Linux hosts, gdb invokes iconvlist to get the list of
possible charsets.  There's no API for this on Linux.

If you build gdb using GNU libiconv, there will be an API,
and gdb won't try to exec this.

However, you may need additional patching, depending on what
you're trying to do.  For example, on Linux gdb will fork
and then test various ptrace features on its child.  This
is done to detect kernel differences at runtime.

> only to have a segment trap because the ifdef path for linux used a pointer set up through the exec iconv path.

Not sure what's going on here but perhaps whatever you did
was incomplete.  Using libiconv definitely works, even on Linux,
I test this way frequently.  (I don't test the iconv-completely-absent
path.)

Anyway, your needs are relatively unusual.  I'd consider clean patches
to arrange a setup that works for you, but I felt you should know that
it's somewhat unlikely that anyone else will pick up this bug.

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