Bruce ran across the following libMesh build errors on his 10.9 Mac:
lude/libmesh/threads.h:542:13: warning: unknown pragma ignored
[-Wunknown-pragmas]
#pragma omp parallel for schedule (static)
^
./include/libmesh/threads.h:642:13: warning: unknown pragma ignored
[-Wunknown-pragmas]
#pragma omp parallel for schedule (static)
^
2 warnings generated.
CXX src/base/libmesh_dbg_la-libmesh.lo
In file included from src/base/libmesh.C:22:
In file included from ./include/libmesh/getpot.h:69:
./include/libmesh/threads.h:542:13: warning: unknown pragma ignored
[-Wunknown-pragmas]
#pragma omp parallel for schedule (static)
^
./include/libmesh/threads.h:642:13: warning: unknown pragma ignored
[-Wunknown-pragmas]
#pragma omp parallel for schedule (static)
^
src/base/libmesh.C:40:10: fatal error: 'omp.h' file not found
#include <omp.h>
^
2 warnings and 1 error generated.
make[1]: *** [src/base/libmesh_dbg_la-libmesh.lo] Error 1
make: *** [all-recursive] Error 1
dhcp-180-184:libmesh brucerodenborn$
Libmesh is looking for omp.h from OpenMP, but I have specified MPICH for the
MPI library. After configuration, it states Openmp=yes. Should I
install OpenMP?
The possible workarounds are simple enough, but it looks like there's
a deeper bug in the ax_openmp we pulled from the autoconf archive. We
should test for omp pragma support and header support, not just for
whether a -openmp or similar compiler flag gets accepted without
error, no?
---
Roy
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