configure.ac

AC_PREREQ(2.63)
# 
# (C) 2006 by Argonne National Laboratory.
#     See COPYRIGHT in top-level directory.
#
dnl Process this file with autoconf to produce a configure script.
dnl
dnl aclocal_cache.m4, included by sowing/confdb/aclocal.m4, fixes 
dnl bugs in autoconf caching.
dnl
dnl This is a large configure script and it is important to keep it
dnl clearly organized.  In addition, this script must coordinate with 
dnl the other modules that can be used to construct MPICH, such as
dnl the communication device and the process manager.  Each of these
dnl may have special features or limitations that other modules or
dnl this configure may need to take into account.  To handle this, there
dnl are xx major steps in this configure script:
dnl
dnl 1. Identify major modules and source any prerequisite scripts
dnl 2. Determine compiler characteristics 
dnl 3. Setup and configure the other modules
dnl 4. Determine MPI features and characteristics (such as datatype values)
dnl
dnl Each of these is described in more detail below.
dnl
dnl 1. Identify the modules (most are specified by 
dnl --with-<modulename>=instance,
dnl for example, --with-pm=hydra or --with-device=ch3:nemesis).
dnl For each module, source the file mpichprereq if present (in the
dnl module's top-level directory).  This
dnl must be a bourne (sh) shell script; it can access any of the variables
dnl in the configure script.  In addition, there are a few variables that
dnl are defined and provided to allow the modules to communicate their 
dnl needs or limitations to the other modules.  These are:
dnl    MPID_MAX_THREAD_LEVEL - thread level supported by device.
dnl                            if unset, is MPI_THREAD_FUNNELED
dnl    MPID_NO_LONG_LONG     - if yes, the device does not support the 
dnl                            long long integer type
dnl    MPID_NO_LONG_DOUBLE   - if yes, the device does not support the
dnl                            long double type
dnl    MPID_PM_NAMESERVER    - if set, provides the name of the nameserver
dnl                            that the process manager supports.
dnl                            This name server will be used if the
dnl                            default name server is selected.
dnl    MPID_NO_PM            - If yes, the device does not require any
dnl                            PM implementation.  
dnl    MPID_NO_PMI           - If yes, the device does not require any 
dnl                            PMI implementation.
dnl    MPID_MAX_PROCESSOR_NAME - The maximum number of character in a processor
dnl                            name.  If not set, 128 will be used.
dnl    MPID_MAX_ERROR_STRING - The maximum number of character in an error
dnl                            string.  If not set, 1024 will be used.
dnl    MPID_LIBTOOL_STATIC_FLAG - The static compilation flag to use
dnl                               for the example executables within
dnl                               mpich.  If not set, -static will be
dnl                               used.
dnl    PMI_REQUIRES_READABLE_TOKENS - if yes, define the C-preprocessor
dnl                            value USE_HUMAN_READABLE_TOKENS, which is
dnl                            used in src/include/mpimem.h to define token
dnl                            separators used in src/util/mem/argstr.c
dnl    PM_REQUIRES_PMI       - if set, provides the name of the PMI 
dnl                            interface implementation.  If not set,
dnl                            the "simple" PMI implementation is used.
dnl                            A process manager that needs a particular
dnl                            process manager should check that this is
dnl                            not set to an incompatible value.
dnl    MPID_NO_SPAWN         - if yes, the device does not support the
dnl                            dynamic process routines (spawn, connect
dnl                            attach, join, plus port and publish 
dnl                            routines).  The major effect of this
dnl                            is to let the test codes know that
dnl                            spawn is not implemented.
dnl    MPID_NO_RMA           - if yes, the device does not support the
dnl                            MPI RMA routines (MPI_Win_create and 
dnl                            MPI_Put etc.).  The major effect of this
dnl                            is to let the test codes know that 
dnl                            RMA is not implemented.
dnl
dnl Note that the meanings of these variables are defined so that an 
dnl undefined value gives the default.  This makes it easy to expand
dnl the set of such variables, since only modules that need the new
dnl variable will need to be changed.
dnl
dnl 2. Determine compiler characteristics
dnl Here is where features of the compilers are determined, including
dnl support for shared libraries and sizes of the basic datatype types.
dnl
dnl 3. Setup and configure the other modules
dnl Before each module configure is executed, the script setup_<module>
dnl is run if present.  This is a bourne (sh) shell script and may
dnl access configure variables.  It should not make any changes to the
dnl compiler name or flags (e.g., do not add -D_XOPEN_SOURCE to CFLAGS here,
dnl because that may invalidate the determination of the compiler 
dnl characteristics in the prior step).
dnl
dnl 4. Determine MPI features
dnl    
dnl
dnl Special environment variables
dnl To let other scripts and in particular the configure in test/mpi
dnl know that they are being invoked from within the MPICH configure,
dnl the following environment variables are set and exported:
dnl    FROM_MPICH
dnl    MPICH_ENABLE_F77
dnl    MPICH_ENABLE_FC
dnl    MPICH_ENABLE_CXX
dnl
dnl Note that no executable statements are allowed (and any are silently 
dnl dropped) before AC_INIT.

m4_include([maint/version.m4])
dnl 2nd arg is intentionally underquoted
AC_INIT([MPICH],
        MPICH_VERSION_m4,
        [discuss@mpich.org],
        [mpich],
        [http://www.mpich.org/])

if test "x$prefix" != "xNONE" && test -d "$prefix"; then 
    if test "x`(cd \"$prefix\"; echo \"$PWD\")`" = "x`(cd \"$srcdir\"; echo \"$PWD\")`" ||\
       test "x`(cd \"$prefix\"; echo \"$PWD\")`" = "x$PWD"  ; then
        AC_MSG_ERROR([The install directory (--prefix=) cannot be the same as the build or src directory.])
    fi
fi         

CONFIGURE_ARGS_CLEAN=`echo $* | tr '"' ' '`
AC_SUBST(CONFIGURE_ARGS_CLEAN)

# these values come from the m4_include above
MPICH_VERSION=MPICH_VERSION_m4
AC_SUBST([MPICH_VERSION])
MPICH_RELEASE_DATE="MPICH_RELEASE_DATE_m4"
AC_SUBST([MPICH_RELEASE_DATE])
libmpi_so_version="libmpi_so_version_m4"
AC_SUBST([libmpi_so_version])


if test -z "$MPICH_VERSION" ; then
    AC_MSG_ERROR([MPICH_VERSION is empty, check maint/version.m4 for errors])
fi
# Produce a numeric version assuming the following format:
# Version: [MAJ].[MIN].[REV][EXT][EXT_NUMBER]
# Example: 1.0.7rc1 has
#          MAJ = 1
#          MIN = 0
#          REV = 7
#          EXT = rc
#          EXT_NUMBER = 1
#
# Converting to numeric version will convert EXT to a format number:
#          ALPHA (a) = 0
#          BETA (b)  = 1
#          RC (rc)   = 2
#          PATCH (p) = 3
# Regular releases are treated as patch 0
#
# Numeric version will have 1 digit for MAJ, 2 digits for MIN,
# 2 digits for REV, 1 digit for EXT and 2 digits for EXT_NUMBER.
changequote(<<,>>)
V1=`expr $MPICH_VERSION : '\([0-9]*\)\.[0-9]*\.*[0-9]*[a-zA-Z]*[0-9]*'`
V2=`expr $MPICH_VERSION : '[0-9]*\.\([0-9]*\)\.*[0-9]*[a-zA-Z]*[0-9]*'`
V3=`expr $MPICH_VERSION : '[0-9]*\.[0-9]*\.*\([0-9]*\)[a-zA-Z]*[0-9]*'`
V4=`expr $MPICH_VERSION : '[0-9]*\.[0-9]*\.*[0-9]*\([a-zA-Z]*\)[0-9]*'`
V5=`expr $MPICH_VERSION : '[0-9]*\.[0-9]*\.*[0-9]*[a-zA-Z]*\([0-9]*\)'`
changequote([,])

if test "$V2" -le 9 ; then V2=0$V2 ; fi
if test "$V3" = "" ; then V3=0; fi
if test "$V3" -le 9 ; then V3=0$V3 ; fi
if test "$V4" = "a" ; then
    V4=0
elif test "$V4" = "b" ; then
    V4=1
elif test "$V4" = "rc" ; then
    V4=2
elif test "$V4" = "" ; then
    V4=3
    V5=0
elif test "$V4" = "p" ; then
    V4=3
fi
if test "$V5" -le 9 ; then V5=0$V5 ; fi

MPICH_NUMVERSION=`expr $V1$V2$V3$V4$V5 + 0`
AC_SUBST(MPICH_NUMVERSION)

# ABIVERSION is the name used by simplemake, so we reassign the
# libmpi_so_version number to it
ABIVERSION=${libmpi_so_version}
export ABIVERSION
export libmpi_so_version
AC_SUBST(ABIVERSION)

# Print out the configure options
CONFIGURE_ARGUMENTS="$ac_configure_args"
AC_SUBST(CONFIGURE_ARGUMENTS)
if test -n "$ac_configure_args" ; then
    echo "Configuring MPICH version $MPICH_VERSION with $ac_configure_args"
else 
    echo "Configuring MPICH version $MPICH_VERSION"
fi

# Add the information on the system:
echo "Running on system: `uname -a`"

dnl Definitions will be placed in this file rather than in the DEFS variable
AC_CONFIG_HEADER(src/include/mpichconf.h)
AH_TOP([/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#ifndef MPICHCONF_H_INCLUDED
#define MPICHCONF_H_INCLUDED
])

# We use an #include strategy here because all of the alternative strategies for
# quashing these variables have various drawbacks.  The alternatives are listed
# here to avoid rediscovery of these problems by someone else in the future:
#
# 1) Strategy: Rewrite mpichconf.h.in with sed at autogen.sh time.
#    Problem: Automatic remaking of config.status and friends will re-run
#             autoheader and blow away our sed changes without an opportunity to
#             patch the resulting file again.
# 2) Strategy: Add literal "#undef PACKAGE" lines to the AH_BOTTOM text.
#    Problem: These lines get rewritten by config.status to be "#define" lines,
#             so the intended quashing never actually occurs.
# 3) Strategy: Use AC_CONFIG_COMMANDS to run a sed rewrite command on
#              mpichconf.h at config.status time.
#    Problem: Causes mpichconf.h to always be rewritten, first by the normal
#             config.status commands and then by sed.  This can cause
#             unnecessary remaking of object files since nearly every C source
#             file includes this header (see the Autoconf Manual, "Automatic
#             Remaking")
#
# The only other plausible strategy would seem to be rewriting config.status
# itself via AC_CONFIG_COMMANDS_POST, but that seems error prone.  The best
# solution would be to stop all subconfigures from including config.h headers
# from other packages.  Then all of this nonsense can be eliminated.
# [goodell@ 2011-08-26]
AH_BOTTOM([
/* Include nopackage.h to undef autoconf-defined macros that cause conflicts in
 * subpackages.  This should not be necessary, but some packages are too
 * tightly intertwined right now (such as ROMIO and the MPICH core) */
#include "nopackage.h"

#endif /* !defined(MPICHCONF_H_INCLUDED) */
])

dnl Set the directory that contains support scripts such as install-sh and
dnl config.guess
AC_CONFIG_AUX_DIR(confdb)
dnl our macro dir is the same as our aux dir
AC_CONFIG_MACRO_DIR([confdb])

# Set the FROM_MPICH variable to tell subconfigures that they are
# built from within MPICH
FROM_MPICH=yes
export FROM_MPICH

# Save a copy of precious flags as USER_* before any of these flags
# are being modified by configure tests.
PAC_PREFIX_ALL_FLAGS(USER)

# WRAPPER_xFLAGS are used by mpicc and friends.
#
# WRAPPER_CFLAGS and other compile flags are used for compile options
# that are added by MPICH, but should be used by applications (such
# as include paths).
#
# All libraries that are detected by MPICH as needed for some of its
# functionality (such as -lpthread) should be added to LIBS so
# autoconf link tests can use them. Libraries that are built by MPICH
# at make time (and hence are not available for autoconf link tests to
# use), such as OPA and MPL, should be added to WRAPPER_LIBS for
# static builds. All libraries in LIBS are added to WRAPPER_LIBS
# (similarly LDFLAGS are added to WRAPPER_LDFLAGS) as well, at the end
# of configure.
PAC_PREFIX_ALL_FLAGS(WRAPPER)
WRAPPER_CFLAGS="$CFLAGS $MPICH_MPICC_FLAGS"
WRAPPER_CPPFLAGS="$CPPFLAGS $MPICH_MPICPP_FLAGS"
WRAPPER_CXXFLAGS="$CXXFLAGS $MPICH_MPICXX_FLAGS"
WRAPPER_FFLAGS="$FFLAGS $MPICH_MPIF77_FLAGS"
WRAPPER_FCFLAGS="$FCFLAGS $MPICH_MPIFC_FLAGS"
WRAPPER_LDFLAGS="$MPICH_LDFLAGS"
WRAPPER_LIBS="$MPICH_LIBS"
EXTERNAL_LIBS=""
export EXTERNAL_LIBS
AC_SUBST(EXTERNAL_LIBS)

# Add MPICHLIB_* to the appropriate flags
AC_ARG_VAR(MPICHLIB_CFLAGS,
	[extra CFLAGS used in building MPICH libraries])
AC_ARG_VAR(MPICHLIB_CPPFLAGS,
	[extra CPPFLAGS used in building MPICH libraries])
AC_ARG_VAR(MPICHLIB_CXXFLAGS,
	[extra CXXFLAGS used in building MPICH libraries])
AC_ARG_VAR(MPICHLIB_FFLAGS,
	[extra FFLAGS used in building MPICH libraries])
AC_ARG_VAR(MPICHLIB_FCFLAGS,
	[extra FCFLAGS used in building MPICH libraries])
AC_ARG_VAR(MPICHLIB_LDFLAGS,
	[extra LDFLAGS used in building MPICH libraries])
AC_ARG_VAR(MPICHLIB_LIBS,
	[extra LIBS used in building MPICH libraries])
CFLAGS="$CFLAGS $MPICHLIB_CFLAGS"
CPPFLAGS="$CPPFLAGS $MPICHLIB_CPPFLAGS"
CXXFLAGS="$CXXFLAGS $MPICHLIB_CXXFLAGS"
FFLAGS="$FFLAGS $MPICHLIB_FFLAGS"
FCFLAGS="$FCFLAGS $MPICHLIB_FCFLAGS"
LDFLAGS="$LDFLAGS $MPICHLIB_LDFLAGS"
LIBS="$LIBS $MPICHLIB_LIBS"

dnl include all subsystem m4 fragments now that the core autoconf functionality
dnl has been setup.  No fragment should do anything except define
dnl PAC_SUBCFG_{PREREQ,BODY} macros which will be expanded later as
dnl appropriate
# begin subsys includes
m4_include([subsys_include.m4])
# end subsys includes

dnl ----------------------------------------------------------------------------
dnl setup top-level argument handling
AC_ARG_ENABLE(echo, 
	AC_HELP_STRING([--enable-echo], [Turn on strong echoing. The default is enable=no.]),
	set -x)

AC_ARG_ENABLE(error-checking,
[  --enable-error-checking=level
      Control the amount of error checking.  
        no        - no error checking
        runtime   - error checking controllable at runtime through environment 
                    variables
        all       - error checking always enabled (default)
],,enable_error_checking=default)

AC_ARG_ENABLE(error-messages,
[  --enable-error-messages=level - Control the amount of detail in error messages.
        all       - Maximum amount of information
        generic   - Only generic messages (no information about the specific
                    instance)
        class     - One message per MPI error class
        none      - No messages
],,enable_error_messages=all)

AC_ARG_ENABLE(timing,
[  --enable-timing=level - Control the amount of timing information
                           collected by the MPICH implementation.
        none    - Collect no data (default)
        all     - Collect lots of data
        runtime - Runtime control of data collected
],,enable_timing=default)

AC_ARG_ENABLE(g,
[  --enable-g=option - Control the level of debugging support in the
                       MPICH implementation.  "option" is a list of comma
                       separated names including.  Default is "most".
        none     - No debugging
        handle   - Trace handle operations
        handlealloc - Trace handle allocations
        dbg      - Add compiler flag, -g, to all internal
                   compiler flags, i.e. MPICHLIB_CFLAGS, MPICHLIB_CXXFLAGS,
                   MPICHLIB_FFLAGS, and MPICHLIB_FCFLAGS.
        debug    - Synonym for dbg
        log      - Enable debug event logging
        mem      - Memory usage tracing
        meminit  - Preinitialize memory associated structures and unions to
                   eliminate access warnings from programs like valgrind
        memarena - Check for overwrite errors in memory allocation arena
        mutex    - Enable error checking on pthread mutexes
        mutexnesting - Check for non-nesting of mutexes
        most     - Most of the above options, excluding some with severe
                   performance impacts.  Recommended for typical development.
        yes      - synonym for "most" (*not* "all")
        all      - All of the above choices
],,enable_g=none)

AC_ARG_ENABLE([mpit_pvars],
[  --enable-mpit-pvars=list - Selectively enable MPI_T performance variables in
                      modules. list is a comma-separated module names,
                      including (Default is "none"):
        none     - No performance info recorded
        recvq    - All message queue-related
        nem      - All nemesis-related
        rma      - All rma-related
        all      - All variables above
],[],[enable_mpit_pvars=none])

dnl We may want to force MPI_Aint to be the same size as MPI_Offset, 
dnl particularly on 32 bit systems with large (64 bit) file systems.
AC_ARG_WITH(aint-size,
	AC_HELP_STRING([--with-aint-size], [Override the size of MPI_AINT (in bytes)]),,
	with_aint_size=0)

AC_ARG_ENABLE(fast,
[  --enable-fast=option - Control the level of fast execution in the
                         MPICH implementation.  option is a list of
                         comma separated names including
        O<n>     - Appends default optimization flags, -O<n>, to all internal
                   compiler flags, i.e. MPICHLIB_CFLAGS, MPICHLIB_CXXFLAGS,
                   MPICHLIB_FFLAGS, and MPICHLIB_FCFLAGS. (default is -O2)
        ndebug   - Appends -DNDEBUG to MPICHLIB_CFLAGS.
        all|yes  - "O2" and "ndebug" are enabled
        none     - None of above options, i.e. --disable-fast
],,enable_fast=O2)

AC_ARG_ENABLE(interlib-deps,
	[AC_HELP_STRING([--interlib-deps - Enable interlibrary dependencies])],,enable_interlib_deps=yes)

AC_ARG_ENABLE(check-compiler-flags,
	AC_HELP_STRING([--enable-check-compiler-flags], [enable the checks for all compiler
                       options, xxxFLAGS, MPICH_xxxFLAGS. Default is on.]),,
		       enable_check_compiler_flags=yes)

dnl We enable f77 and fc if we can find compilers for them.
dnl In addition, we check whether f77 and fc can work together.
AC_ARG_ENABLE(fortran,
[  --enable-fortran=option - Control the level of Fortran support in the MPICH implementation.
	yes|all   - Enable all available Fortran implementations (F77, F90+)
	f77       - Enable Fortran 77 support
	fc        - Enable Fortran 90 and 2008 support
	no|none   - No Fortran support
],,[enable_fortran=all])

AC_ARG_ENABLE(f77,
	AC_HELP_STRING([--enable-f77],
		[DEPRECATED: Use --enable-fortran or --disable-fortran instead]),,[enable_f77=yes])

AC_ARG_ENABLE(fc,
	AC_HELP_STRING([--enable-fc],
		[DEPRECATED: Use --enable-fortran or --disable-fortran instead]),,[enable_fc=yes])

AC_ARG_ENABLE(cxx,
	AC_HELP_STRING([--enable-cxx], [Enable C++ bindings]),,enable_cxx=yes)

AC_ARG_ENABLE(romio,
	AC_HELP_STRING([--enable-romio], [Enable ROMIO MPI I/O implementation]),,
	enable_romio=yes)

AC_ARG_ENABLE(debuginfo,
	AC_HELP_STRING([--enable-debuginfo], [Enable support for debuggers]),,
	enable_debuginfo=no)


## Enable creation of libtool-style versioning or no versioning
AC_ARG_ENABLE(versioning,
        [AC_HELP_STRING([--enable-versioning],[Enable library versioning])],,
        [enable_versioning=yes])

if test "$enable_versioning" = "yes" ; then
   ABIVERSIONFLAGS="-version-info \$(ABIVERSION)"
else
   ABIVERSIONFLAGS="-avoid-version"
fi
export ABIVERSIONFLAGS
AC_SUBST(ABIVERSIONFLAGS)


dnl The environment variable MPICH_DEBUGLIBNAME may be used to
dnl override the default name of the library that the debugger will
dnl load to access the MPICH internal data structures.

dnl "default" is a special device that allows MPICH to choose one
dnl based on the environment.
AC_ARG_WITH(device,
	AC_HELP_STRING([--with-device=name], [Specify the communication device for MPICH]),,
	with_device=default)

AC_ARG_WITH(pmi,
	AC_HELP_STRING([--with-pmi=name], [Specify the pmi interface for MPICH]),,
	with_pmi=default)

AC_ARG_WITH(pm, 
	AC_HELP_STRING([--with-pm=name],
		[Specify the process manager for MPICH.  "no" or "none" are
                 valid values.  Multiple process managers may be specified as
                 long as they all use the same pmi interface by separating them
                 with colons.  The mpiexec for the first named process manager
                 will be installed.  Example: "--with-pm=hydra:gforker"
                 builds the two process managers hydra, and gforker;
                 only the mpiexec from hydra is installed into the bin
                 directory.]),,with_pm=default)

AC_ARG_WITH(logging,
	AC_HELP_STRING([--with-logging=name], [Specify the logging library for MPICH]),
	[if test -z "$withval" ; then with_logging=rlog ; fi],with_logging=none)

AC_ARG_ENABLE(threads,
[  --enable-threads=level - Control the level of thread support in the 
                           MPICH implementation.  The following levels
                           are supported.
        single          - No threads (MPI_THREAD_SINGLE)
        funneled        - Only the main thread calls MPI (MPI_THREAD_FUNNELED)
        serialized      - User serializes calls to MPI (MPI_THREAD_SERIALIZED)
        multiple        - Fully multi-threaded (MPI_THREAD_MULTIPLE)
        runtime         - Alias to "multiple"

        See also the --enable-thread-cs option for controlling the granularity of
        the concurrency inside of the library
],,enable_threads=default)

AC_ARG_ENABLE(thread-cs,
	AC_HELP_STRING([--enable-thread-cs=type],
			[Choose the method used for critical sections
                         and other atomic updates when multiple
                         threads are present.  Values may be global
                         (default), per-object, lock-free]),,enable_thread_cs=global)

AC_ARG_ENABLE(refcount,
	AC_HELP_STRING([--enable-refcount=type],
			[Choose the method for ensuring atomic updates
                         to the reference counts for MPI objects.
                         Values may be lock, lock-free, none.  The
                         default depends on the thread-cs choice; for
                         global it is none (because none is required),
                         for per-object it is lock, and for lock-free
                         it is lock-free]),,enable_refcount=default)

AC_ARG_ENABLE(mutex-timing,
	AC_HELP_STRING([--enable-mutex-timing], [calculate the time spent waiting on mutexes]),
	AC_DEFINE(MPIU_MUTEX_WAIT_TIME,1,[Define to enable timing mutexes]))

AC_ARG_ENABLE(handle-allocation,
	AC_HELP_STRING([--enable-handle-allocation=type],
			[Choose the method used for allocating MPI
			 object handles.  Values may be 'tls' for
			 thread-local storage or 'mutex' for simple
			 locking.  'mutex' is the default.]),,enable_handle_allocation=default)

AC_ARG_ENABLE([predefined-refcount],
	AS_HELP_STRING([--enable-predefined-refcount],
                       [control whether predefined objects like
		       MPI_COMM_WORLD are reference counted (default
		       depends on --enable-thread-cs choice)]),[],
              [enable_predefined_refcount=default])

AC_ARG_ENABLE(weak-symbols,
	AC_HELP_STRING([--enable-weak-symbols],
			[Use weak symbols to implement PMPI routines (default)]),,
		enable_weak_symbols=yes)

AC_ARG_ENABLE([two-level-namespace],
              [AS_HELP_STRING([--enable-two-level-namespace],
                              [(Darwin only) Build shared libraries and programs
                               built with the mpicc/mpifort/etc. compiler
                               wrappers with '-Wl,-commons,use_dylibs' and
                               without '-Wl,-flat_namespace'.  This may make the
                               MPICH installation and MPI programs more
                               compatible with other libraries.  Only enable
                               this option if you really know what these linker
                               options imply.])],
              [],
              [enable_two_level_namespace=no])

AC_ARG_ENABLE(multi-aliases,
	AC_HELP_STRING([--enable-multi-aliases],
		[Multiple aliasing to support multiple fortran compilers (default)]),,
		enable_multi_aliases=yes)

AC_ARG_ENABLE([wrapper-rpath],
              [AC_HELP_STRING([--enable-wrapper-rpath],
                              [Determine whether the rpath is set when programs
                               are linked by mpicc compiler wrappers.  This only
                               applies when shared libraries are built.  The
                               default is yes; use --disable-wrapper-rpath to
                               turn this feature off.  In that case, shared
                               libraries will be found according to the rules
                               for your system (e.g., in LD_LIBRARY_PATH)])],
              [],[enable_wrapper_rpath=yes])
AC_SUBST([enable_wrapper_rpath])

AC_ARG_ENABLE([long-double],
              [AC_HELP_STRING([--disable-long-double],
                              [Pass --disable-long-double to prevent the MPI
                               library from supporting the C "long double" type,
                               even if the C compiler supports it.  "long
                               double" support is enabled by default, provided
                               the compiler supports it.])],
              [],
              [enable_long_double=yes])

AC_ARG_WITH(cross,
	AC_HELP_STRING([--with-cross=file],
		[Specify the values of variables that configure cannot
                 determine in a cross-compilation environment]),,
		 with_cross=$MPID_DEFAULT_CROSS_FILE)
if test -z "$with_cross" ; then with_cross=no ; fi
if test "$with_cross" != "no"; then
  AC_MSG_NOTICE([Using cross file: $with_cross])
fi

AC_ARG_WITH(namepublisher,
[  --with-namepublisher=name   Choose the system that will support 
                              MPI_PUBLISH_NAME and MPI_LOOKUP_NAME.  Options
                              include
                                   pmi (default)
			           file[:directory] (optional directory)
                                   no (no service available)],,with_namepublisher=default)
AC_ARG_WITH(name-publisher,
    [],
    with_namepublisher=$with_name_publisher,)

# Find a C compiler.
# We also need to do this before the F77 and FC test to ensure that we
# find the C preprocessor reliably.
PAC_PROG_CC
AM_PROG_CC_C_O dnl needed for automake "silent-rules"
PAC_PUSH_FLAG([CFLAGS])
AC_PROG_CPP
# Bug in autoconf.  Restore cross settings
if test "$pac_cross_compiling" = "yes" -a "$ac_cv_prog_cc_cross" = "no" ; then
    AC_MSG_RESULT([Resetting cross compilation to yes])
    cross_compiling=yes
    ac_cv_prog_cc_cross=yes
    ac_cv_prog_f77_cross=yes
    ac_cv_prog_fc_cross=yes
    ac_cv_prog_cxx_cross=yes
fi
PAC_POP_FLAG([CFLAGS])

dnl now that autoconf and core compilers are setup, init automake and libtool
dnl
dnl We would like to pass -Werror, but we are cheating in the "examples/"
dnl directory and overriding the user-flags like CFLAGS, which automake-1.12
dnl warns about.  Long-term we may need to use a hand-written Makefile.in or
dnl something else in this special dir.
AM_INIT_AUTOMAKE([-Wall -Wno-portability-recursive foreign 1.12.3 silent-rules subdir-objects])
AM_MAINTAINER_MODE([enable])

AM_PROG_AR

LT_INIT()
# Non-verbose make by default
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

# Disable rpath in the compiler wrappers if shared libraries are disabled, since
# rpath makes no sense in the context of static libraries.
if test "X$enable_shared" = "Xno" ; then
    enable_wrapper_rpath=no
fi

INTERLIB_DEPS=yes
# We conservatively disable interlibrary dependencies if the libtool
# support model is anything different from "pass_all"
if test "X$enable_shared" = "Xno" -o "$deplibs_check_method" != "pass_all" -o "$enable_interlib_deps" = "no" ; then
    INTERLIB_DEPS=no
fi
export INTERLIB_DEPS
AC_SUBST(INTERLIB_DEPS)

dnl AC_PROG_{CXX,F77,FC} must come early in configure.ac in order to avoid some
dnl esoteric autoconf macro expansion errors
dnl
dnl Also, DO NOT attempt to place shell conditionals (either manually or via
dnl AS_IF) around these macros in an effort to save configure time.  It will
dnl lead to weird AM_CONDITIONAL errors and potentially other problems.

# Before attempting to find valid compilers, set the corresponding precious
# shell variable to "no" for any languages that have been disabled by the user
# with "--disable-LANG".  Libtool understands this as a request to disable
# support for this language. This should save a bit of configure time and also
# prevent user complaints like ticket #1570.
AS_IF([test "x$enable_f77" = "xno"],[F77=no])
AS_IF([test "x$enable_fc"  = "xno"],[FC=no])
AS_IF([test "x$enable_cxx" = "xno"],[CXX=no])

# suppress default "-g -O2" from AC_PROG_CXX
: ${CXXFLAGS=""}
AC_PROG_CXX([PAC_CXX_SEARCH_LIST])

# suppress default "-g -O2" from AC_PROG_FC
: ${FCFLAGS=""}
AC_PROG_FC([PAC_FC_SEARCH_LIST])

save_IFS="$IFS"
IFS=","
enable_f77=no
enable_fc=no
for option in $enable_fortran ; do
    case "$option" in
        yes|all)
		enable_f77=yes
		enable_fc=yes
		;;
        no|none)
		;;
        f77)
		enable_f77=yes
		;;
        fc)
		enable_fc=yes
		;;
        *)
		IFS="$save_IFS"
		AC_MSG_WARN([Unknown value $option for --enable-fortran])
		IFS=","
		;;
    esac
done
IFS="$save_IFS"

if test "$enable_f77" = "no" ; then
   if test "$enable_fc" = "yes" ; then
      AC_MSG_ERROR([Fortran 90 support requires enabling Fortran 77])
   fi
fi

if test ! -z "$FC" -a -z "$F77" ; then
   F77=$FC
   if test ! -z "$FCFLAGS" -a -z "$FFLAGS" ; then
      FFLAGS=$FCFLAGS
   fi
fi

AM_CONDITIONAL([INSTALL_MPIF77],[test "$F77" != "$FC" -a "$FFLAGS" != "$FCFLAGS"])

# This needs to come after we've potentially set F77=$FC. Otherwise, we could
# override the user's Fortran compiler selection when only specifying FC at configure
# time, as is allowed.
# suppress default "-g -O2" from AC_PROG_F77
: ${FFLAGS=""}
AC_PROG_F77([PAC_F77_SEARCH_LIST])

# compute canonical system types
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
# TARGET not needed, MPICH isn't a compiler

# Enable better caching control
PAC_ARG_CACHING

# Set CFLAGS for enable strict if necessary.  Do this *first* because
# it may influence the output of the other tests
PAC_ARG_STRICT

# -----------------------------------------------------------------------------
# First check that we have a clean build if we are doing a VPATH build
PAC_VPATH_CHECK(src/include/mpi.h src/env/mpicc,lib)

# ----------------------------------------------------------------------------
# This test is complicated by the fact that top_srcdir is not set until
# the very end of configure.  Instead, we get it ourselves
if test -z "$top_srcdir" ; then
   use_top_srcdir=$srcdir   
else
   use_top_srcdir=$top_srcdir
fi
if test -z "$master_top_srcdir" ; then 
    # This needs to be an absolute pathname
    case "$use_top_srcdir" in
    /*) ;;
    *)
        use_top_srcdir=`(cd $use_top_srcdir && pwd)`
	;;	
    esac
    master_top_srcdir=$use_top_srcdir
fi
# Get the directory that we're running in...
if test -z "$master_top_builddir" ; then
   master_top_builddir="`pwd`"
fi
AC_SUBST(master_top_builddir)
AC_SUBST(master_top_srcdir)
export master_top_builddir
export master_top_srcdir

# ----------------------------------------------------------------------------
dnl Export important "precious" variables so that any directories configured via
dnl PAC_CONFIG_SUBDIR will agree with the top-level configure about these
dnl critical variables (esp. compiler selection).  These exports should come
dnl before any subconfigures in this script.
dnl
dnl This list is arguably incomplete, and should possibly be automatically
dnl generated from "$ac_precious_vars" using code similar to the implementation
dnl of PAC_CONFIG_SUBDIR.
dnl
dnl To be clear, without these exports any variable values determined by this
dnl configure script will not be seen by child scripts.  Instead they will dnl
dnl receive the only the original inherited environment and configure args used
dnl when this configure script was invoked.
export AR
export AR_FLAGS
export CC
export CFLAGS
export CPPFLAGS
export CXX
export CXXFLAGS
export F77
export FC
export FCFLAGS
export FFLAGS
export LDFLAGS
export LIBS
export MPILIBNAME
export PMPILIBNAME
export RANLIB
export OPALIBNAME
export MPLLIBNAME
# ----------------------------------------------------------------------------
# with-device
if test "$with_device" = "default" ; then
    # Pick the device.  For now, always choose ch3
    with_device=ch3
fi
# Extract the device name from any options
# Allow the device to specify a directory; if no directory, use the
# included directories
# 
DEVICE=$with_device
AC_SUBST(DEVICE)

device_name=`echo $with_device | sed -e 's/:.*$//'`
changequote(<<,>>)
device_args=`echo $with_device | sed -e 's/^[^:]*//' -e 's/^://'`
changequote([,])

devicedir=$use_top_srcdir/src/mpid/$device_name
devicereldir=src/mpid/$device_name
case "$device_name" in
     /*) 
     devicedir=$DEVICE
     # Get the name from the leaf
     device_name=`echo $device_name ~ sed -e 's%.*/%%'`
     # FIXME: should the devicereldir be different (perhaps not -
     # this allows use to build within our tree, even when other data
     # is outside of the tree)
     ;;
     *) 
     ;;
esac
export device_name
export device_args
export devicedir

# See if the device wants to say something about the compilers
if test -f $devicedir/mpichprereq ; then
    . $devicedir/mpichprereq
fi

# expand all of the prereq macros in the correct order
m4_map([PAC_SUBCFG_DO_PREREQ], [PAC_SUBCFG_MODULE_LIST])

# ----------------------------------------------------------------------------
# Set default library names if names haven't already been provided
AC_ARG_VAR([MPILIBNAME],[can be used to override the name of the MPI library (default: "mpi")])
AC_ARG_VAR([PMPILIBNAME],[can be used to override the name of the MPI profiling library (default: "p$MPILIBNAME")])
AC_ARG_VAR([MPICXXLIBNAME],[can be used to override the name of the MPI C++ library (default: "${MPILIBNAME}cxx")])
AC_ARG_VAR([MPIFCLIBNAME],[can be used to override the name of the MPI fortran library (default: "${MPILIBNAME}fort")])
MPILIBNAME=${MPILIBNAME:-"mpi"}
PMPILIBNAME_set=no
if test -n "$PMPILIBNAME" ; then 
   PMPILIBNAME_set=yes
fi
PMPILIBNAME=${PMPILIBNAME:-"p$MPILIBNAME"}
# Note that the name for this library may be updated after we check for 
# enable_shmem
# Fortran names are set later.
# We use a different library for the C++ wrappers to avoid problems when
# creating shared libraries
if test -z "$MPICXXLIBNAME" ; then MPICXXLIBNAME="${MPILIBNAME}cxx" ; fi
if test -z "$MPIFCLIBNAME" ; then MPIFCLIBNAME="${MPILIBNAME}fort" ; fi
export MPICXXLIBNAME
export MPIFCLIBNAME
AC_SUBST(MPICXXLIBNAME)
AC_SUBST(MPIFCLIBNAME)

# We'll set FORTRAN_BINDING to 1 if we support Fortran 
FORTRAN_BINDING=0

# enable-fast
# strip off multiple options, separated by commas
save_IFS="$IFS"
IFS=","
for option in $enable_fast ; do
    case "$option" in
        O*)
        enable_fast_opts=$option
        ;;
        ndebug)
        enable_fast_ndebug=yes
        ;;
        all|yes)
        enable_fast_ndebug=yes
        enable_fast_opts=O2
        ;;
        none|no)
        enable_fast_ndebug=no
        enable_fast_opts=O0
        ;;
        *)
	IFS="$save_IFS"
        AC_MSG_WARN([Unknown value $option for --enable-fast])
	IFS=","
        ;;
    esac
done
IFS="$save_IFS"

if test -n "$enable_fast_opts" ; then
   # Allows O<n> where <n> can be [0-9] or ' '.
   opt_flags=`echo $enable_fast_opts | sed -e 's%\(O[0-9] \)%\1%g'`
   if test -n "$opt_flags" ; then
      MPI_DEFAULT_COPTS="-$enable_fast_opts"
      MPI_DEFAULT_CXXOPTS="-$enable_fast_opts"
      MPI_DEFAULT_FOPTS="-$enable_fast_opts"
      MPI_DEFAULT_FCOPTS="-$enable_fast_opts"
   else
      AC_MSG_WARN([Unknown value $enable_fast_opts for --enable-fast])
   fi
fi

if test "$enable_fast_ndebug" = "yes" ; then
    CFLAGS="$CFLAGS -DNDEBUG -DNVALGRIND"
    CXXFLAGS="$CXXFLAGS -DNDEBUG -DNVALGRIND"
    # MPICH does NOT assume any preprocessing support from the Fortran compiler,
    # so no Fortran files contain any preprocessing statements.
    # Don't set FFLAGS or FCFLAGS with any -D.
fi

# error-checking
# Change default into the specific value of the default
if test "$enable_error_checking" = "default" ; then
   enable_error_checking=all
fi
# glue_romio.h needs the variable HAVE_ERROR_CHECKING to have the value 0 or 1
HAVE_ERROR_CHECKING=0
case "$enable_error_checking" in 
    no)
    # if error checking has been disabled, then automatically disable the error
    # checking tests in the test suite
    ac_configure_args="${ac_configure_args} --disable-checkerrors"
    ;;
    all|yes|runtime)
    error_checking_kind=`echo $enable_error_checking | \
    tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
    error_checking_kind=MPID_ERROR_LEVEL_$error_checking_kind
    AC_DEFINE_UNQUOTED(HAVE_ERROR_CHECKING,$error_checking_kind,[Define to enable error checking])
    HAVE_ERROR_CHECKING=1
    ;;
    *)
    AC_MSG_WARN([Unknown value $enable_error_checking for enable-error-checking])
    ;;
esac
# permit @HAVE_ERROR_CHECKING@ substitution in glue_romio.h 
AC_SUBST([HAVE_ERROR_CHECKING])

# error-messages
case "$enable_error_messages" in 
    no|none)
        error_message_kind="MPICH_ERROR_MSG_NONE"
    ;;
    all|yes)
	error_message_kind="MPICH_ERROR_MSG_ALL"
    ;;
    generic)
	error_message_kind="MPICH_ERROR_MSG_GENERIC"
    ;;
    class)
	error_message_kind="MPICH_ERROR_MSG_CLASS"
    ;;
    *)
    AC_MSG_WARN([Unknown value $enable_error_messages for enable-error-messages])
    ;;
esac
AC_DEFINE_UNQUOTED(MPICH_ERROR_MSG_LEVEL,$error_message_kind,[define to enable error messages])

# ----------------------------------------------------------------------------
#
# enable-timing and with-logging
#
# Still to do: add subsets: e.g., class=pt2pt,class=coll.  See mpich doc
#
# Logging and timing are intertwined.  If you select logging, you
# may also need to select a timing level.  If no timing is selected 
# but logging with rlog is selected, make "all" the default timing level.
#
# FIXME: make timing and logging options work more cleanly together,
# particularly when other logging options are selected (e.g., logging is not
# rlog).
# ----------------------------------------------------------------------------
AM_CONDITIONAL([BUILD_LOGGING_RLOG],[test "X$with_logging" = "Xrlog"])
collect_stats=false
logging_required=false
if test "$enable_timing" = "default" ; then
    if test "$with_logging" = "rlog" ; then
        enable_timing=all
    fi
fi
timing_name=$enable_timing
case "$enable_timing" in
    no)
    timing_name=none
    ;;
    time)
    collect_stats=true
    ;;
    log|log_detailed)
    logging_required=true
    ;;
    yes)