I am trying to build the 1.7 nightly tarball (1.7.4rc2r30303) on a Linux/PPC system with the xlc-11.1 compilers configured for 32-bit output:
$ export OBJECT_MODE=32 $ [pathto]/configure CC=xlc CXX=xlC FC=xlf90 --enable-debug --prefix=... The build fails with: Making all in mpi/cxx make[2]: Entering directory `/gpfs-biou/phh1/OMPI/openmpi-1.7.4-latest-linux-ppc32-xlc-11.1/BLD/ompi/mpi/cxx' CXX mpicxx.lo "/home/phh1/SCRATCH/OMPI/openmpi-1.7.4-latest-linux-ppc32-xlc-11.1/openmpi-1.7.4rc2r30303/opal/threads/mutex.h", line 292.15: 1540-0274 (S) The name lookup for "opal_atomic_add_64" did not find a declaration. make[2]: *** [mpicxx.lo] Error 1 My guess is due to the ILP31 target, there might not *be* any atomic 64-bit add. However, my Linux/ARM build with gcc worked fine, so clearly (to me) there is support for ILP32 systems. The OBJECT_MODE=64 case gets past this point (but fails building fortran support - report coming soon). I will accept "we don't support this target", but am reporting this for completeness. -Paul -- Paul H. Hargrove phhargr...@lbl.gov Future Technologies Group Computer and Data Sciences Department Tel: +1-510-495-2352 Lawrence Berkeley National Laboratory Fax: +1-510-486-6900
