On 02-03-15 18:31, Mike Looijmans wrote:
On 02-03-15 16:45, Paul Eggleton wrote:
Hi Mike,
On Monday 02 March 2015 15:54:04 Mike Looijmans wrote:
Here's the problem, running in a devshell:
# echo '#include <omp.h>' > /tmp/compileme.c
# $CC -c -fopenmp /tmp/compileme.c
/tmp/compileme.c:1:17: fatal error: omp.h: No such file or directory
#include <omp.h>
^
compilation terminated.
The #pragma's and linking of OpenMP work just fine, it's just the inclusion
of omp.h that appears to fail.
What I was actually trying to do is to activate OpenMP in OpenCV to get
decent performance on a multicore ARM system. But this is holding me back
now.
Looking in the sysroots reveals that the include file is actually there:
$ find tmp-glibc/sysroots/topic-miami-florida-med-xc7z030 -name omp.h
tmp-glibc/sysroots/topic-miami-florida-med-xc7z030/usr/lib/gcc/arm-oe-linux-
gnueabi/4.9.1/include/omp.h
Funnily enough this is an issue I fixed a few weeks ago - here's the bug which
contains a link to the fix:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=7141
Ah okay, I'll upgrade to current master and retest.
If it works, I'll post the patch to make opencv build with openmp.
Hmm, OpenCV now builds fine with OpenMP support for my dual-core ARM system, I
can also see that it now links to libgomp, but apparently it doesn't actually
use any OpenMP threading, as none of the filters I've tried ever uses more
than one thread to process the image data. So I guess actually activating
OpenMP is just a pointless waste. But for those willing to try, just add this
line to the opencv recipe:
EXTRA_OECMAKE += "-DWITH_OPENMP=ON"
Met vriendelijke groet / kind regards,
Mike Looijmans
System Expert
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