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Bug 1356152 - undefined references to omp_* when building openblas
Summary: undefined references to omp_* when building openblas
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: openblas
Version: 24
Hardware: ppc64
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Susi Lehtola
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: PPCTracker 1356189
TreeView+ depends on / blocked
 
Reported: 2016-07-13 13:46 UTC by Dan Horák
Modified: 2016-07-13 22:32 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2016-07-13 22:32:13 UTC
Type: Bug
Embargoed:

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Description Dan Horák 2016-07-13 13:46:00 UTC 
I'm getting undefined reference errors when building openblas (https://admin.fedoraproject.org/pkgdb/package/rpms/openblas/) for ppc64. If I'm correct they are from gcc's libgomp.

...
make[1]: *** [cblat1] Error 1
../libopenblaso_power8-r0.2.18.a(zaxpy.o): In function `num_cpu_avail':
/home/sharkcz/openblas/openblas-0.2.18/openmp/interface/../common_thread.h:141: undefined reference to `omp_in_parallel'
/home/sharkcz/openblas/openblas-0.2.18/openmp/interface/../common_thread.h:146: undefined reference to `omp_get_max_threads'
../libopenblaso_power8-r0.2.18.a(zswap.o): In function `num_cpu_avail':
/home/sharkcz/openblas/openblas-0.2.18/openmp/interface/../common_thread.h:141: undefined reference to `omp_in_parallel'
/home/sharkcz/openblas/openblas-0.2.18/openmp/interface/../common_thread.h:146: undefined reference to `omp_get_max_threads'
../libopenblaso_power8-r0.2.18.a(zscal.o): In function `num_cpu_avail':
/home/sharkcz/openblas/openblas-0.2.18/openmp/interface/../common_thread.h:141: undefined reference to `omp_in_parallel'
/home/sharkcz/openblas/openblas-0.2.18/openmp/interface/../common_thread.h:146: undefined reference to `omp_get_max_threads'
../libopenblaso_power8-r0.2.18.a(zdscal.o): In function `num_cpu_avail':
/home/sharkcz/openblas/openblas-0.2.18/openmp/interface/../common_thread.h:141: undefined reference to `omp_in_parallel'
/home/sharkcz/openblas/openblas-0.2.18/openmp/interface/../common_thread.h:146: undefined reference to `omp_get_max_threads'
../libopenblaso_power8-r0.2.18.a(blas_server.o): In function `exec_blas._omp_fn.0':
/home/sharkcz/openblas/openblas-0.2.18/openmp/driver/others/blas_server_omp.c:305: undefined reference to `omp_get_num_threads'
/home/sharkcz/openblas/openblas-0.2.18/openmp/driver/others/blas_server_omp.c:305: undefined reference to `omp_get_thread_num'
../libopenblaso_power8-r0.2.18.a(blas_server.o): In function `exec_threads':
/home/sharkcz/openblas/openblas-0.2.18/openmp/driver/others/blas_server_omp.c:225: undefined reference to `omp_get_thread_num'
../libopenblaso_power8-r0.2.18.a(blas_server.o): In function `goto_set_num_threads':
/home/sharkcz/openblas/openblas-0.2.18/openmp/driver/others/blas_server_omp.c:68: undefined reference to `omp_set_num_threads'
../libopenblaso_power8-r0.2.18.a(blas_server.o): In function `exec_blas':
/home/sharkcz/openblas/openblas-0.2.18/openmp/driver/others/blas_server_omp.c:305: undefined reference to `GOMP_parallel'
collect2: error: ld returned 1 exit status
Makefile:133: recipe for target 'zblat1' failed
...

tested locally on F-24, but http://ppc.koji.fedoraproject.org/koji/taskinfo?taskID=3535680 is a rawhide scratch build

Version-Release number of selected component (if applicable):
gcc-6.1.1-3.fc24.ppc64
libgomp-6.1.1-3.fc24.ppc64
Comment 1 Jakub Jelinek 2016-07-13 14:13:48 UTC 
Do you use -fopenmp on the link line?
Comment 2 Dan Horák 2016-07-13 14:29:01 UTC 
seems not, below should be the corresponding command line leading to the error, going to check the openblas buildsystem ...

gfortran -frecursive   -o zblat1 zblat1.o ../libopenblaso_power8-r0.2.18.a -lm -lpthread -lgfortran -lm -lpthread -lgfortran
Comment 3 Jakub Jelinek 2016-07-13 14:43:08 UTC 
If anything in ../libopenblaso_power8-r0.2.18.a or zblat1.o is compiled with -fopenmp, then that is the bug, -fopenmp should be used not just during compilation, but also during linking if there is any object compiled with -fopenmp.
Comment 4 Dan Horák 2016-07-13 14:53:53 UTC 
yep, and I think I at least see where is the difference between ppc64 and other arches - the other arches don't build the tests (in our rpm builds), thus don't call the wrong link command ...
Comment 5 Dan Horák 2016-07-13 16:49:34 UTC 
switching to openblas, because the root cause is there
Comment 6 Susi Lehtola 2016-07-13 19:32:13 UTC 
Looks like a simple problem of the make flags not getting passed to the recursive processes.
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