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Date: Mon, 30 Oct 2017 17:41:36 +0100
From: Pali =?utf-8?B?Um9ow6Fy?= <pali.rohar@gmail.com>
To: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Pavel Machek <pavel@ucw.cz>,
        Mauro Carvalho Chehab <mchehab@s-opensource.com>,
        Sakari Ailus <sakari.ailus@iki.fi>,
        Sakari Ailus <sakari.ailus@linux.intel.com>, sre@kernel.org,
        ivo.g.dimitrov.75@gmail.com, linux-media@vger.kernel.org
Subject: Re: [patch] libv4l2: SDL test application
Message-ID: <20171030164136.jkn2qlzu27krqvdz@pali>
References: <20171028195742.GB20127@amd>
 <478fd1ae-6f25-5cda-3035-1d5894c8caab@xs4all.nl>
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On Monday 30 October 2017 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?

Is not for <<undefined reference to symbol 'log2@@GLIBC_2.2.5'>> needed
just -lm? log2 should be in mathematical library.

-- 
Pali Rohár
pali.rohar@gmail.com