When building mpich-3.2a for Blue Gene /Q and following the same procedure used for building mpich-3.1.2 for BG/Q, the required linking information for spi and pami is omitted from the wrappers. I'm not sure if this is intentional or not. Thanks, William Patching the wrappers to reflect the required linking gives the following diff : [wscullin@vestasn1 ~]$ diff /projects/Operations/wscullin/mpich-3.2a1/gcc-4.4.7/bin/mpicc /projects/Operations/wscullin/mpich-3.2a1/gcc-4.4.7/bin/mpicc-postpatch 265c265 < $Show $CC $PROFILE_INCPATHS -L/bgsys/drivers/V1R2M2/ppc64/spi/lib -L/bgsys/drivers/V1R2M2/ppc64/comm/lib "${allargs[@]}" -I$includedir -L$libdir $PROFILE_PRELIB $PROFILE_FOO $rpath_flags -lmpi $PROFILE_POSTLIB ---

$Show $CC $PROFILE_INCPATHS -L/bgsys/drivers/V1R2M2/ppc64/spi/lib -L/bgsys/drivers/V1R2M2/ppc64/comm/lib "${allargs[@]}" -I$includedir -L$libdir $PROFILE_PRELIB $PROFILE_FOO $rpath_flags -lmpi $PROFILE_POSTLIB -lpami-gcc -lpthread -lSPI -lSPI_cnk -lrt -lstdc++

Full diff of mpich-3.1.2 versus 3.2a wrappers: [wscullin@vestasn1 ~]$ diff /projects/Operations/wscullin/mpich-3.1.2/gcc-4.4.7/bin/mpicc /projects/Operations/wscullin/mpich-3.2a1/gcc-4.4.7/bin/mpicc 30,34c30,34 < prefix=/projects/Operations/wscullin/mpich-3.1.2/gcc-4.4.7 < exec_prefix=/projects/Operations/wscullin/mpich-3.1.2/gcc-4.4.7 < sysconfdir=/projects/Operations/wscullin/mpich-3.1.2/gcc-4.4.7/etc < includedir=/projects/Operations/wscullin/mpich-3.1.2/gcc-4.4.7/include < libdir=/projects/Operations/wscullin/mpich-3.1.2/gcc-4.4.7/lib ---

prefix=/projects/Operations/wscullin/mpich-3.2a1/gcc-4.4.7 exec_prefix=/projects/Operations/wscullin/mpich-3.2a1/gcc-4.4.7 sysconfdir=/projects/Operations/wscullin/mpich-3.2a1/gcc-4.4.7/etc includedir=/projects/Operations/wscullin/mpich-3.2a1/gcc-4.4.7/include libdir=/projects/Operations/wscullin/mpich-3.2a1/gcc-4.4.7/lib 40c40 < MPICH_VERSION="3.1.2"

MPICH_VERSION="3.2a1" 262c262 < $Show $CC $PROFILE_INCPATHS -L/bgsys/drivers/V1R2M2/ppc64/spi/lib -L/bgsys/drivers/V1R2M2/ppc64/comm/lib -L/bgsys/drivers/V1R2M2/ppc64/spi/lib -L/bgsys/drivers/V1R2M2/ppc64/comm/lib "${allargs[@]}" -I$includedir

$Show $CC $PROFILE_INCPATHS -L/bgsys/drivers/V1R2M2/ppc64/spi/lib -L/bgsys/drivers/V1R2M2/ppc64/comm/lib "${allargs[@]}" -I$includedir

265c265 < $Show $CC $PROFILE_INCPATHS -L/bgsys/drivers/V1R2M2/ppc64/spi/lib -L/bgsys/drivers/V1R2M2/ppc64/comm/lib -L/bgsys/drivers/V1R2M2/ppc64/spi/lib -L/bgsys/drivers/V1R2M2/ppc64/comm/lib "${allargs[@]}" -I$includedir -L$libdir $PROFILE_PRELIB $PROFILE_FOO $rpath_flags -lmpi $PROFILE_POSTLIB -lpami-gcc -lpthread -lSPI -lSPI_cnk -lrt -lstdc++ ---

$Show $CC $PROFILE_INCPATHS -L/bgsys/drivers/V1R2M2/ppc64/spi/lib -L/bgsys/drivers/V1R2M2/ppc64/comm/lib "${allargs[@]}" -I$includedir -L$libdir $PROFILE_PRELIB $PROFILE_FOO $rpath_flags -lmpi $PROFILE_POSTLIB

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