Hi Ralf, Erik! On 12/22/2010 07:44 AM, Ralf Wildenhues wrote: > One problem with the above is that the settings 'gcc' and 'cc' will fail > to be correct MPI compilers, as they likely won't link in the MPI > library. Nowadays this doesn't happen so often any more but on some > systems it is good to have that possibility (also to override the > library name with $MPILIBS). See the respective code in AX_MPI which > tries to get that stuff right also. I only showed the reduced example code. My full code (that I have attached) also cares for the library - but only for the C language so far. > I still intend to come up with a AX_MPI_ONLY macro, to be added to > ax_mpi.m4, that fixes this and also works for the other languages. > (I don't mind being beaten to it though ;-) > > These macros need to be kept close together so they can remain in sync. I would also be willing to contribute. I believe that my current macro "ES_CHECK_MPI" might be a good basis for that. In general, I would find it nice if the macro would be flexible enough to allow for the "--with-mpi"-logic, where it is also possible for the user not to use MPI if the application allows for it (for example if the application contains nullmpi). I have set up a github clone of the autoconf archive where I will push my efforts: https://github.com/olenz/autoconf-archive Cheers Olaf -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?
dnl -*- mode: autoconf -*- dnl Copyright (C) 2010 The ESPResSo project dnl Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2010 Max-Planck-Institute for Polymer Research, Theory Group, PO Box 3148, 55021 Mainz, Germany dnl dnl This file is part of ESPResSo. dnl dnl ESPResSo is free software: you can redistribute it and/or modify dnl it under the terms of the GNU General Public License as published by dnl the Free Software Foundation, either version 3 of the License, or dnl (at your option) any later version. dnl dnl ESPResSo is distributed in the hope that it will be useful, dnl but WITHOUT ANY WARRANTY; without even the implied warranty of dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the dnl GNU General Public License for more details. dnl dnl You should have received a copy of the GNU General Public License dnl along with this program. If not, see <http://www.gnu.org/licenses/>. dnl dnl Recognize the MPI compiler AC_DEFUN([ES_CHECK_MPI],[ dnl The following is needed to avoid a "macro is expanded before it dnl is required" warning. The function _ES_CHECK_MPI will check for dnl the compiler AC_REQUIRE([_ES_CHECK_MPI]) AS_IF([test x"$with_mpi" != xno], [ # test whether MPI_Init is available now AC_CHECK_FUNC(MPI_Init,, [ # if not, try to find it in a library AC_SEARCH_LIBS(MPI_Init, [mpi mpich],, [ # if not, give up or use fake if test xyes = x"$with_mpi"; then AC_MSG_FAILURE([MPI compiler requested, but couldn't compile with MPI.]) else AC_MSG_WARN([No MPI compiler found, will use fake implementation!]) use_mpi_fake="yes" fi ]) ]) # test wether the MPI headers are there AS_IF([test x"$use_mpi_fake" != xyes], [ AC_MSG_CHECKING([for mpi.h]) AC_TRY_COMPILE([#include <mpi.h>],,[ AC_MSG_RESULT(yes) ], [ AC_MSG_RESULT(no) AC_MSG_ERROR([Header mpi.h was not found!]) ]) ]) ]) # if requested, use the fake implementation AM_CONDITIONAL(MPI_FAKE, [test x"$use_mpi_fake" = xyes]) # determine ESPRESSO_MPIEXEC AS_IF([test x"$use_mpi_fake" = xyes], [ ESPRESSO_MPIEXEC="" ],[ # mpiexec executable AC_ARG_VAR([MPIEXEC], [MPI command mpiexec]) AS_IF([test x"$MPIEXEC" = x], [ AC_PATH_PROG([MPIEXEC], [mpiexec], [no]) ]) AC_MSG_CHECKING([for the mympiexec user script]) AC_ARG_WITH([mympiexec], AS_HELP_STRING([--with-mympiexec@<:@=SCRIPT@:>@], [specify the mpiexec-like program or script that should be used to run ESPResSo in parallel. If the script doesn't exist, it will try to use mpiexec. @<:@SCRIPT=./mympiexec.sh@:>@]), [if test x"$with_mympiexec" = xno; then MYMPIEXEC="" else MYMPIEXEC="$with_mympiexec" dir=`AS_DIRNAME([$MYMPIEXEC])` if test x"$dir" = x.; then MYMPIEXEC="`pwd`/$MYMPIEXEC" fi fi], [ MYMPIEXEC="`pwd`/mympiexec.sh" ]) AC_MSG_RESULT($MYMPIEXEC) AC_SUBST(MYMPIEXEC) ESPRESSO_MPIEXEC="`pwd`/tools/es_mpiexec" ]) ]) dnl We need to split the main function (ES_CHECK_MPI) into two parts dnl to avoid an "macro is expanded before it is required" warning. AC_DEFUN([_ES_CHECK_MPI],[ AC_MSG_CHECKING([whether to compile using MPI]) # Check for --with-mpi AC_ARG_WITH(mpi, [AC_HELP_STRING([--with-mpi], [compile with MPI (parallelization) support. If none is found, the fake implementation for only one processor is used. Default: guess]) ], [], [ with_mpi=guess ]) AC_MSG_RESULT($with_mpi) AC_ARG_VAR(MPICC,[MPI C compiler command]) # if MPI is wanted, look for MPI compiler if test x"$with_mpi" != xno; then COMPILERS="mpicc hcc mpxlc_r mpxlc mpcc cmpicc gcc cc /usr/ucb/cc cl.exe" else COMPILERS="gcc cc /usr/ucb/cc cl.exe" use_mpi_fake="yes" fi if test -z "$CC" && test -n "$MPICC"; then CC="$MPICC" fi AC_PROG_CC($COMPILERS) ])
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