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Re: [PATCH 18/29] tools/xenstored: rename xenbus_evtchn()
- To: Julien Grall <julien@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 1 Nov 2023 12:08:00 +0100
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- Cc: Wei Liu <wl@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Delivery-date: Wed, 01 Nov 2023 11:08:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.11.23 11:44, Julien Grall wrote:
Hi Juergen,
On 01/11/2023 09:33, Juergen Gross wrote:
Rename the xenbus_evtchn() function to get_xenbus_evtchn() in order to
avoid two externally visible symbols with the same name when Xenstore-
stubdom is being built with a Mini-OS with CONFIG_XENBUS set.
This works right now, but what guarantee us that Mini-OS will not change other
symbols and clash with the one provided by Xenstored again?
Furthermore, technically, this is a problem for all the other software linked
with Mini-OS. So wouldn't it be better to modify the Mini-OS build system to
prefix all the symbols of the linked binary (here Xenstored)?
How would that work?
From Mini-OS point of view libraries are not distinguishable from the
linked application. This would mean the build system would prefix the
library symbols as well, while the application would try to reference
the the un-prefixed library symbols.
I think the only way to avoid this kind of problem would be to have a
positive list of exported Mini-OS symbols and to hide all other symbols
from linked libraries and the app.
I can look into this, but I'd like to do this work outside of this
series in order not to block its development for an unknown amount of
time.
Juergen
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