From: Pavel Machek <pavel@ucw.cz>
To: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Mauro Carvalho Chehab <mchehab@s-opensource.com>,
Sakari Ailus <sakari.ailus@iki.fi>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
pali.rohar@gmail.com, sre@kernel.org,
ivo.g.dimitrov.75@gmail.com, linux-media@vger.kernel.org
Subject: Re: [patch] libv4l2: SDL test application
Date: Mon, 30 Oct 2017 22:19:31 +0100 [thread overview]
Message-ID: <20171030211931.GA19901@amd> (raw)
In-Reply-To: <478fd1ae-6f25-5cda-3035-1d5894c8caab@xs4all.nl>
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On Mon 2017-10-30 17:30:53, Hans Verkuil wrote:
> Hi Pavel,
>
> On 10/28/2017 09:57 PM, Pavel Machek wrote:
> > Add support for simple SDL test application. Allows taking jpeg
> > snapshots, and is meant to run on phone with touchscreen. Not
> > particulary useful on PC with webcam, but should work.
>
> When I try to build this I get:
>
> make[3]: Entering directory '/home/hans/work/src/v4l/v4l-utils/contrib/test'
> CCLD sdlcam
> /usr/bin/ld: sdlcam-sdlcam.o: undefined reference to symbol 'log2@@GLIBC_2.2.5'
> //lib/x86_64-linux-gnu/libm.so.6: error adding symbols: DSO missing from command line
> collect2: error: ld returned 1 exit status
> Makefile:561: recipe for target 'sdlcam' failed
> make[3]: *** [sdlcam] Error 1
> make[3]: Leaving directory '/home/hans/work/src/v4l/v4l-utils/contrib/test'
> Makefile:475: recipe for target 'all-recursive' failed
> make[2]: *** [all-recursive] Error 1
> make[2]: Leaving directory '/home/hans/work/src/v4l/v4l-utils/contrib'
> Makefile:589: recipe for target 'all-recursive' failed
> make[1]: *** [all-recursive] Error 1
> make[1]: Leaving directory '/home/hans/work/src/v4l/v4l-utils'
> Makefile:516: recipe for target 'all' failed
> make: *** [all] Error 2
>
> I had to add -lm -ldl -lrt to sdlcam_LDFLAGS. Is that correct?
Yes, that should be correct. I had that problem, too, but I thought I
solved it with simpler configure.ac.
Best regards,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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prev parent reply other threads:[~2017-10-30 21:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-28 19:57 [patch] libv4l2: SDL test application Pavel Machek
2017-10-30 16:30 ` Hans Verkuil
2017-10-30 16:41 ` Pali Rohár
2017-10-30 16:48 ` Hans Verkuil
2017-10-30 21:19 ` Pavel Machek [this message]
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