configure.in

MPI stands for the Message Passing Interface. Written by the MPI Forum (a large committee comprising

#include <sys/aio.h>],
[],have_sys_aio_h=yes,have_sys_aio_h=no)
    AC_MSG_RESULT($have_sys_aio_h)
    if test "$have_sys_aio_h" = yes ; then
        AC_DEFINE(HAVE_SYS_AIO_H,1,[Define if sys/aio.h exists and can be compiled])
    fi
fi

if test "$have_aio_h" = "yes" -o "$have_sys_aio_h" = "yes" ; then

    # Check that aio is available (many systems appear to have aio
    # either installed improperly or turned off).
    # The test is the following: if not cross compiling, try to run a 
    # program that includes a *reference* to aio_write but does not call it
    # If the libraries are not set up correctly, then this will fail.
    save_libs=$LIBS
    LIBS="$LIBS $ROMIO_LIBLIST"
    AC_MSG_CHECKING([whether aio routines can be used])
    # Include aio.h and the aiocb struct (since we'll need these to 
    # actually use the aio_write interface).  Note that this will 
    # fail for some pre-POSIX implementations of the aio interface 
    # (an old IBM interface needs an fd argument as well)
    AC_TRY_RUN([
#include <sys/types.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_AIO_H
#include <aio.h>
#endif
#ifdef HAVE_SYS_AIO_H
#include <sys/aio.h>
#endif
	int main(int argc, char **argv)
	{
            struct aiocb *aiocbp;
	    if (argc > 10) aio_write(aiocbp);
	    return 0;
	}
	],
	aio_runs=yes
	AC_MSG_RESULT(yes),
	aio_runs=no
	AC_MSG_RESULT(no),
	aio_runs=unknown
	AC_MSG_RESULT(unknown)
    )
    if test "$aio_runs" != "no" ; then
	AC_DEFINE(ROMIO_HAVE_WORKING_AIO, 1, Define if AIO calls seem to work)
    fi
    
    # now about that old IBM interface...
    # modern AIO interfaces have the file descriptor in the aiocb structure,
    # and will set ROMIO_HAVE_STRUCT_AIOCB_WITH_AIO_FILDES.  Old IBM
    # implementations pass the file descriptor as an argument to aio_write and
    # aio_read.  AIO still works on these platforms, but we have to test with
    # two-argument aio_write to avoid a false negative.  no need to worry about
    # the two-argument vs. one-argument aio_write and aio_read: ROMIO already
    # uses ROMIO_HAVE_STRUCT_AIOCB_WITH_AIO_FILDES to call aio_write and
    # aio_read correctly

    AC_MSG_CHECKING([for obsolete two-argument aio_write])
    AC_TRY_RUN([
#include <sys/types.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_AIO_H
#include <aio.h>
#endif
#ifdef HAVE_SYS_AIO_H
#include <sys/aio.h>
#endif
	int main(int argc, char **argv)
	{
		int fd;
		struct aiocb *aiocbp;
		if (argc > 10) aio_write(fd, aiocbp);
		return 0;
	}
	],
	aio_two_arg_write=yes
	AC_MSG_RESULT(yes),
	aio_two_arg_write=no 
	AC_MSG_RESULT(no),
	aio_two_arg_write=unknown
	AC_MSG_RESULT(unknown)
    )

    if test "$aio_two_arg_write" != "no" -a "$aio_runs" != "yes" ; then
    	AC_DEFINE(ROMIO_HAVE_WORKING_AIO, 1, Define if AIO calls seem to work)
	AC_DEFINE(ROMIO_HAVE_AIO_CALLS_NEED_FILEDES, 1, Define if AIO calls need file descriptor)
    fi

    AC_MSG_CHECKING([for obsolete two-argument aio_suspend])
    AC_TRY_RUN([
#include <sys/types.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_AIO_H
#include <aio.h>
#endif
#ifdef HAVE_SYS_AIO_H
#include <sys/aio.h>
#endif
	int main(int argc, char **argv)
	{
		struct aiocb *aiocbp;
		if (argc > 10) aio_suspend(1, &aiocbp);
		return 0;
	}
	],
	aio_two_arg_suspend=yes
	AC_MSG_RESULT(yes),
	aio_two_arg_suspend=no 
	AC_MSG_RESULT(no),
	aio_two_arg_suspend=unknown
	AC_MSG_RESULT(unknown)
    )

    if test "$aio_two_arg_suspend" != "no" -a "$aio_runs" != "yes" ; then
	AC_DEFINE(ROMIO_HAVE_AIO_SUSPEND_TWO_ARGS, 1, Define if aio_suspend needs two arguments)
    fi

    LIBS=$save_libs

    AC_MSG_CHECKING([for aio_fildes member of aiocb structure])
    AC_TRY_COMPILE([
	#ifdef HAVE_SIGNAL_H
	#include <signal.h>
	#endif
	#ifdef HAVE_AIO_H
	#include <aio.h>
	#endif
	#ifdef HAVE_SYS_AIO_H
	#include <sys/aio.h>
	#endif
	],[
	struct aiocb a;
	a.aio_fildes = 0;
	],
	AC_MSG_RESULT(yes)
	AC_DEFINE(ROMIO_HAVE_STRUCT_AIOCB_WITH_AIO_FILDES, 1, [Define if aiocb has aio_fildes member]),
	AC_MSG_RESULT(no)
    )
    AC_MSG_CHECKING(for aio_whence member of aiocb structure)
    AC_TRY_COMPILE([
	#ifdef HAVE_SIGNAL_H
	#include <signal.h>
	#endif
	#ifdef HAVE_AIO_H
	#include <aio.h>
	#endif
	#ifdef HAVE_SYS_AIO_H
	#include <sys/aio.h>
	#endif
	#include <sys/types.h>
	#include <unistd.h>
	],[
	struct aiocb a;
	a.aio_whence = SEEK_SET;
	],
	AC_MSG_RESULT(yes)
	AC_DEFINE(ROMIO_HAVE_STRUCT_AIOCB_WITH_AIO_WHENCE, 1, [Define if aiocb has aio_whence member]),
	AC_MSG_RESULT(no)
    )
    AC_MSG_CHECKING(for aio_handle member of aiocb structure)
    AC_TRY_COMPILE([
	#ifdef HAVE_SIGNAL_H
	#include <signal.h>
	#endif
	#ifdef HAVE_AIO_H
	#include <aio.h>
	#endif
	#ifdef HAVE_SYS_AIO_H
	#include <sys/aio.h>
	#endif
	],[
	struct aiocb a;
	aio_handle_t h;

	a.aio_handle = h;
	],
	AC_MSG_RESULT(yes)
	AC_DEFINE(ROMIO_HAVE_STRUCT_AIOCB_WITH_AIO_HANDLE, 1, [Define if aiocb has aio_handle member]),
	AC_MSG_RESULT(no)
    )
    AC_MSG_CHECKING(for aio_reqprio member of aiocb structure)
    AC_TRY_COMPILE([
	#ifdef HAVE_SIGNAL_H
	#include <signal.h>
	#endif
	#ifdef HAVE_AIO_H
	#include <aio.h>
	#endif
	#ifdef HAVE_SYS_AIO_H
	#include <sys/aio.h>
	#endif
	],[
	struct aiocb a;

	a.aio_reqprio = 0;
	],
	AC_MSG_RESULT(yes)
	AC_DEFINE(ROMIO_HAVE_STRUCT_AIOCB_WITH_AIO_REQPRIO, 1, [Define if aiocb has aio_reqprio member]),
	AC_MSG_RESULT(no)
    )	
    AC_MSG_CHECKING(for aio_sigevent member of aiocb structure)
    AC_TRY_COMPILE([
	#ifdef HAVE_SIGNAL_H
	#include <signal.h>
	#endif
	#ifdef HAVE_AIO_H
	#include <aio.h>
	#endif
	#ifdef HAVE_SYS_AIO_H
	#include <sys/aio.h>
	#endif
	],[
	struct aiocb a;

	a.aio_sigevent.sigev_signo = 0;
	],
	AC_MSG_RESULT(yes)
	AC_DEFINE(ROMIO_HAVE_STRUCT_AIOCB_WITH_AIO_SIGEVENT, 1, [Define if aiocb has aio_sigevent member]),
	AC_MSG_RESULT(no)
    )
	
fi
# End of aio-related tests

#
# Check for statfs (many) and specifically f_fstypename field (BSD)
#
AC_CHECK_HEADERS(sys/vfs.h sys/param.h sys/mount.h sys/statvfs.h)
AC_MSG_CHECKING([whether struct statfs properly defined])
AC_TRY_COMPILE([
    #ifdef HAVE_SYS_VFS_H
    #include <sys/vfs.h>
    #endif
    #ifdef HAVE_SYS_STATVFS_H
    #include <sys/statvfs.h>
    #endif
    #ifdef HAVE_SYS_PARAM_H
    #include <sys/param.h>
    #endif
    #ifdef HAVE_SYS_MOUNT_H
    #include <sys/mount.h>
    #endif
    ],[
    struct statfs f;
    ],
    pac_cv_have_statfs=yes,pac_cv_have_statfs=no
)
AC_MSG_RESULT($pac_cv_have_statfs)
# At this point, we could check for whether defining 
# __SWORD_TYPE as sizet_t or int/long (size of pointer)
# would help.  FIXME

if test "$pac_cv_have_statfs" = yes ; then
    AC_DEFINE(HAVE_STRUCT_STATFS,1,[Define if struct statfs can be compiled])
fi
	  
AC_MSG_CHECKING([for f_fstypename member of statfs structure])
AC_TRY_COMPILE([
    #include <sys/param.h>
    #include <sys/mount.h>
    #include <string.h>
    ],[
    struct statfs f;
    memset(&f, 0, sizeof(f));
    strncmp("nfs", f.f_fstypename, 3);
    ],
    pac_cv_have_statfs_f_fstypename=yes,
    pac_cv_have_statfs_f_fstypename=no
)
AC_MSG_RESULT($pac_cv_have_statfs_f_fstypename)
if test $pac_cv_have_statfs_f_fstypename = yes ; then
    AC_DEFINE(ROMIO_HAVE_STRUCT_STATFS_WITH_F_FSTYPENAME, 1,[Define if statfs has f_fstypename])
fi

#
# Check for stat and st_fstype field (NEC SX4)
#
AC_CHECK_HEADERS(sys/stat.h sys/types.h unistd.h)
AC_CHECK_FUNCS(stat,
    [AC_DEFINE(HAVE_STAT, 1, Define if stat function is present)
    AC_MSG_CHECKING([for st_fstype member of stat structure])
    AC_TRY_COMPILE([
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_STAT_H
	#include <sys/stat.h>
	#endif
	#ifdef HAVE_UNISTD_H
	#include <unistd.h>
	#endif
	],[
	struct stat s;

	s.st_fstype = NULL;
	],
	AC_MSG_RESULT(yes)
	AC_DEFINE(ROMIO_HAVE_STRUCT_STAT_WITH_ST_FSTYPE, 1, Define if struct stat has a st_fstype member),
	AC_MSG_RESULT(no)
    )
])

#
# Check for statvfs and f_basetype field (Solaris, Irix, AIX, etc.)
#
AC_CHECK_HEADERS(sys/types.h sys/statvfs.h sys/vfs.h)
AC_CHECK_FUNCS(statvfs,
    [AC_DEFINE(HAVE_STATVFS, 1, Define if statvfs function is present)
    AC_MSG_CHECKING([for f_basetype member of statvfs structure])
    AC_TRY_COMPILE([
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
        #ifdef HAVE_SYS_VFS_H
        #include <sys/vfs.h>
        #endif
	#ifdef HAVE_SYS_STATVFS_H
	#include <sys/statvfs.h>
	#endif
	], [
	struct statvfs foo;

	foo.f_basetype = NULL;
	],
	AC_MSG_RESULT(yes)
	AC_DEFINE(ROMIO_HAVE_STRUCT_STATVFS_WITH_F_BASETYPE, 1, defined if struct statvfs has a f_basetype member),
	AC_MSG_RESULT(no)
    )
])

#
# Check for large file support.  Make sure that we can use the off64_t 
# type (in some cases, it is an array, and the ROMIO code isn't prepared for
# that).
#
AC_CHECK_HEADERS(unistd.h)
if test "$ac_cv_header_unistd_h" = "yes" ; then
    AC_CACHE_CHECK([for large file defines],ac_cv_has_large_file_defines,[
    AC_TRY_COMPILE([
#include <unistd.h>
        ], [
        #ifndef _LFS64_LARGEFILE
        #error no largefile defines
        #endif
        ],ac_cv_has_large_file_defines=yes,ac_cv_has_large_file_defines=no)])
    if test "$ac_cv_has_large_file_defines" = "yes" ; then
        # See if we can use them
    AC_CACHE_CHECK([whether off64_t is an scalar type],ac_cv_off64_t_scalar,[
    AC_TRY_COMPILE([
#define _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
#include <unistd.h>
],[off64_t a = 3;],ac_cv_off64_t_scalar=yes,ac_cv_off64_t_scalar=no)])

        if test "$ac_cv_off64_t_scalar" = "yes" ; then
            CFLAGS="${CFLAGS} -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64"
        fi
    fi
fi


####################################################################
# We're about to mess with CC etc.  No more feature tests past here,
# because we may set CC to something that does not yet exist!
####################################################################

if test -n "$mpi_mpich"; then
   if test -z "$arch_SX4" ; then
      MPIOF_H_INCLUDED=1
   fi
   if test "$FROM_MPICH2" = no; then
      AC_DEFINE(NEEDS_MPI_TEST,1,[Define if mpi_test needed])
      AC_DEFINE(MPICH,1,[Define if using MPICH])
   fi
fi

if test -n "$mpi_sgi"; then
   AC_DEFINE(MPISGI,1,[Define if SGI MPI])
fi

if test -n "$mpi_lam"; then
   AC_DEFINE(MPILAM,1,[Define if using LAM/MPI])
fi

if test -n "$mpi_hp"; then
   AC_DEFINE(MPIHP,1,[Define if using HP MPI])
   if test "$NOF77" = 0; then
      PAC_CHECK_MPIOF_H
   fi
fi
#
AC_CHECK_FUNCS(strerror)
if test -z "$srcdir" -o "$srcdir" = "." ; then srcdir="$ROMIO_HOME" ; fi
AC_SUBST(srcdir)
# The master_top_srcdir is the location of the source for the building
# package.  This is used only as part of the MPICH2 build, including 
# the documentation targets mandoc, htmldoc, and latexdoc
if test -z "$master_top_srcdir" ; then
    if test "$FROM_MPICH2" = yes ; then
        AC_MSG_WARN([Could not determine master_top_srcdir])
    fi
fi
AC_SUBST(master_top_srcdir)
#
# Get the master builddir (which may be imported from above)
if test -z "$master_top_builddir" ; then
    master_top_builddir=`pwd`
fi
export master_top_builddir
AC_SUBST(master_top_builddir)
# Make sure the alternate spelling is used until we clean up all of the code
master_topbuild_dir=$master_top_builddir
export master_topbuild_dir
AC_SUBST(master_topbuild_dir)

# The following definitions are needed within adio/common/status_setb.c
if test "$FROM_MPICH" = yes ; then
   AC_DEFINE(MPICH,1,[Define if compiling within MPICH])
elif test "$FROM_MPICH2" = yes ; then 
   AC_DEFINE(ROMIO_INSIDE_MPICH2,1,[Define if compiling within MPICH2])
elif test "$FROM_MPILAM" = yes ; then
   AC_DEFINE(MPILAM,1,[Define if compiling within LAM/MPI])
fi

if test "$FROM_MPICH2" = no -a "$FROM_MPICH" = no ; then 
    if test -z "$LIBNAME"; then