-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Niko Lau wrote: > 2009/12/15 Ian Harrold <ian.harr...@gmail.com>: >> >> On Tue, Dec 15, 2009 at 10:31 AM, Niko Lau <niko84embed...@googlemail.com> >> wrote: >>> 2009/12/15 Lennart Sorensen <lsore...@csclub.uwaterloo.ca>: >>>> 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 >> >> Did you compile uclibc with "UCLIBC_HAS_REALTIME" option for real time >> support? I beleive this to be correct. >> >> shm_open() implementation is in /librt/shm.c and defined in >> /include/sys/shm.h >> >> So if your code capture.c uses shm, then you need to link the implementation >> -lrt in the compile to fix the linker error. If that still doesn't work >> then perhaps you didn't compile uclibc to support shm? > > Ok it looks like shm is not fully implemented yet.
Hi, that's wrong, shm support is now fully available on master branch > > -lrt in compile line doesnt work. UCLIBC_HAS_REALTIME is on, but there > is no /librt/shm.c. where are you looking for ? > > Thanks for the help. > Niko > _______________________________________________ > uClibc mailing list > uClibc@uclibc.org > http://lists.busybox.net/mailman/listinfo/uclibc > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAksohzIACgkQoRq/3BrK1s9/pwCgqWP/l3W1FyIChjof2+8B/NJA xkEAn27jPAmvjlIm7bXM2Dzal0UNjUKz =KGy+ -----END PGP SIGNATURE----- _______________________________________________ uClibc mailing list uClibc@uclibc.org http://lists.busybox.net/mailman/listinfo/uclibc