Il 15/12/2009 17.31, Niko Lau ha scritto:
2009/12/15 Lennart Sorensen<[email protected]>:
On Tue, Dec 15, 2009 at 05:16:05PM +0100, Niko Lau wrote:
I want to use the libv4l2 for my arm platform with uclibc cross compiler.
When I link a appl with that lib I get the following error:
arm-linux-uclibc-gcc -Wall -O2 -g -I../libv4l2/include
-L../libv4l2/lib -o capture capture.c -lv4l2 -lv4lconvert
../libv4l2/lib/libv4lconvert.so: undefined reference to `shm_open'
collect2: ld returned 1 exit status
make: *** [test] Fehler 1
The lib is built with the same compiler without any error.
Can someone give me a hint what the problem is. Since it works with a
glibc compiler i think the problem is the uclibc.
The man page (for the glibc version) says you have to link with -lrt.
I don't see you doing that. Do you have to? Does uclibc have such
a thing and does it do shm_open? I guess it must or the header files
would have failed yoiur earlier compile already.
--
Len Sorensen
The -lrt flag is set during libv4lconvert building. I can see shm_open
in the include file (/sys/mman.h)
so i think uclibc has shm_open.
Niko
Hi Niko, you may read the threads:
http://lists.uclibc.org/pipermail/uclibc/2006-December/037885.html
http://lists.uclibc.org/pipermail/uclibc/2007-July/039125.html
http://lists.uclibc.org/pipermail/uclibc/2009-February/041886.html
http://lists.uclibc.org/pipermail/uclibc/2009-June/042541.html
As last uclibc's release is "2 March 2009, uClibc 0.9.30.1", I'm not
sure ( but I could be wrong ) that full shm support has been already
included.
Regards,
--
Carlo Zinato
Viscount International S.p.A.
R&D Labs, Ancona, Italy
phone & fax +39 071 2905127 / 2905142
e-mail: [email protected]
skype: carlo_rd_viscount
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