From: Philippe Gerum <rpm@xenomai.org>
To: Giulio Moro <g.moro@qmul.ac.uk>,
"xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai] Linking shared library which relies on bootstrap.o fails
Date: Tue, 28 Nov 2017 17:27:31 +0100 [thread overview]
Message-ID: <f76137b1-16c4-5a7d-fc21-98dfb541066b@xenomai.org> (raw)
In-Reply-To: <DB6PR0701MB2456EB08FE752DA5BF73FF6DB53A0@DB6PR0701MB2456.eurprd07.prod.outlook.com>
On 11/28/2017 05:18 PM, Giulio Moro wrote:
> armv7 (BeagleBone Black), Xenomai 3.0.5.
>
> When linking a shared library with something like
> gcc `/usr/xenomai/bin/xeno-config --skin=alchemy --ldflags` -rdynamic -shared -o libmylib.so
>
> I get
>
> /usr/bin/ld: /usr/xenomai/lib/xenomai/bootstrap.o: relocation R_ARM_THM_MOVW_ABS_NC against `a local symbol' can not be used when making a shared object; recompile with -fPIC
> /usr/xenomai/lib/xenomai/bootstrap.o: error adding symbols: Bad value
>
> I understand this can be fixed by compiling the Xenomai library (or at least boostrap.o) with -fPIC.
>
No, please see the documentation about --auto-init, --auto-init-solib:
https://xenomai.org/documentation/xenomai-3/html/man1/xeno-config/index.html
> Should this not be made the default setting?
No, we need a non-PIC version for pure execs too. This is why we have
two builds of bootstrap.o - PIC and non-PIC, selected by the proper
xeno-config switch, depending on the link target.
--
Philippe.
next prev parent reply other threads:[~2017-11-28 16:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-28 16:18 [Xenomai] Linking shared library which relies on bootstrap.o fails Giulio Moro
2017-11-28 16:27 ` Philippe Gerum [this message]
2017-11-28 23:24 ` [Xenomai] Library cannot be dlopen()ed Giulio Moro
2017-11-29 9:08 ` Philippe Gerum
2017-11-29 16:52 ` Giulio Moro
2017-12-11 14:03 ` Henning Schild
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