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# Configure path for MPI header
# Note: we're assuming that mpicc will take care of finding the MPI library
# (which is only required for linking of gretlmpi), so here we're mostly
# just checking that mpi.h can be found, and recording the include path if
# necessary
# Allin Cottrell, February 2014, revised November 2017
AC_DEFUN([AC_C_MPI],
[
# mpi-lib not used, just retained for backward compatibility
AC_ARG_WITH(mpi-lib,
[ --with-mpi-lib=PFX path to MPI library],,)
AC_ARG_WITH(mpi-include,
[ --with-mpi-include=PFX path to MPI header],
[MPI_inc_check="$with_mpi_include $with_mpi_include/include $with_mpi_include/include/openmpi"],
[MPI_inc_check="/usr/include /usr/local/include /usr/include/openmpi /opt/openmpi/include /usr/lib/openmpi/include"])
# can we find the header just using the default search paths?
AC_CHECK_HEADER(mpi.h,have_mpi="yes",,)
# if not, try our own search
if test $have_mpi = no ; then
ARCH=`uname -m`
ARCHPATHS="/usr/include/openmpi-${ARCH} /usr/lib/${ARCH}-linux-gnu/openmpi/include /usr/local/include/openmpi-${ARCH}"
MPI_incdir=
for m in $MPI_inc_check $ARCHPATHS ; do
if test -d "$m" && test -f "$m/mpi.h" ; then
MPI_incdir=$m
break
fi
done
if test -z "$MPI_incdir" ; then
AC_MSG_RESULT([couldn't find mpi.h])
else
AC_MSG_RESULT([found mpi.h in $MPI_incdir])
have_mpi=yes
if test "$MPI_incdir" != "/usr/include" ; then
MPI_CFLAGS="-I${MPI_incdir}"
fi
fi
fi
if test $have_mpi = yes ; then
AC_DEFINE(HAVE_MPI)
if test x"${MPICC}" = x ; then
MPICC=mpicc
fi
AC_SUBST(MPICC)
AC_SUBST(MPI_CFLAGS)
fi
])
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