Building with OpenMP support in OE fails on #include <omp.h>

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

Hi Mike,

Quoted 19 lines · 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:

Quoted 3 lines

$ 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

Quoted 26 lines · Paul Eggleton

Hi Mike,

Quoted 22 lines · 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

Quoted 4 lines

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.