dnl **************************************************************
dnl DARSHAN AUTOCONF SCRIPT
dnl
dnl Process this file with autoconf to produce a configure script.
dnl You may need to use autoheader as well if changing any DEFINEs

dnl sanity checks, output header, location of scripts used here
AC_INIT([darshan-runtime], [3.0.1])
AC_CONFIG_SRCDIR([darshan.h])
AC_CONFIG_AUX_DIR(../maint/config)
AC_CONFIG_HEADER(darshan-runtime-config.h)

AC_PROG_INSTALL

dnl Check to see if CC is an MPI compiler
dnl TODO: better error message here
AC_MSG_CHECKING(whether the mpicc compiler works)
AC_TRY_COMPILE([#include <mpi.h>], [int ret = MPI_Init(0, (void*)0)],
    AC_MSG_RESULT(yes),
    AC_MSG_RESULT(no)
    AC_MSG_ERROR(CC doesn't appear to be a valid MPI compiler.  See INSTALL document or try adding CC=mpicc to your configure command line.)
)

dnl runtime libraries require zlib
CHECK_ZLIB

AC_ARG_ENABLE(ld-preload, 
[  --disable-ld-preload    Disables support for LD_PRELOAD library], 
[if test "x$enableval" = "xno" ; then
    DISABLE_LDPRELOAD="1"
fi]
,)

AC_ARG_ENABLE(cuserid, 
[  --disable-cuserid       Disables attempted use of cuserid() at run time], 
[if test "x$enableval" = "xno" ; then
    AC_DEFINE(__DARSHAN_DISABLE_CUSERID, 1, Define if cuserid() should be disabled)
fi]
,)

AC_ARG_ENABLE(group-readable-logs, 
[  --enable-group-readable-logs
                          Set log files to be group readable], 
[if test "x$enableval" = "xyes" ; then
    AC_DEFINE(__DARSHAN_GROUP_READABLE_LOGS, 1, Define if Darshan should set log files to be group readable)
fi]
,)

AC_ARG_ENABLE(
    [bgq_mod],
    [  --disable-bgq-mod       Disables compilation and use of BG/Q module (for BG/Q systems)],
    [],
    [enable_bgq_mod=check]
)

AC_ARG_ENABLE(mmap-logs,
[  --enable-mmmap-logs     Enables ability to mmap I/O data to log file],
[if test "x$enableval" = "xyes" ; then
    AC_DEFINE(__DARSHAN_ENABLE_MMAP_LOGS, 1, Define if Darshan should mmap data structures to log file)
    ENABLE_MMAP_LOGS=1
    AC_CONFIG_FILES(share/darshan-mmap-epilog.sh)
fi]
,)

AC_ARG_WITH(mem-align,
[  --with-mem-align=<num>  Memory alignment in bytes],
    if test x$withval = xyes; then
        AC_MSG_ERROR(--with-mem-align must be given a number in bytes)
    else
        AC_DEFINE_UNQUOTED(__DARSHAN_MEM_ALIGNMENT, ${withval}, Memory alignment in bytes)
        GOT_ALIGNMENT=1
    fi
)

AC_ARG_WITH(log-path-by-env,
[  --with-log-path-by-env=<env var list>
                          Comma separated list of environment variables to check for
                          log path location before --with-log-path path],
    if test x$withval = xyes; then
        AC_MSG_ERROR(--with-log-path-by-env must be given at least one variable name)
    else
        AC_DEFINE_UNQUOTED(__DARSHAN_LOG_ENV, "${withval}", Comma separated list of env. variables to use for log path)
        __DARSHAN_LOG_ENV="${withval}"
        GOT_LOG_PATH=1
    fi
)

AC_ARG_WITH(log-hints,
[  --with-log-hints=<hint1=x;hint2=y>
                          Semicolon-separated list of MPI-IO hints for log file write],
    if test x$withval = xyes; then
        AC_MSG_ERROR(--with-log-hints must be given an argument)
    else
        AC_DEFINE_UNQUOTED(__DARSHAN_LOG_HINTS, "${withval}", Semicolon-separated list of MPI-IO hints for log file write)
        __DARSHAN_LOG_HINTS="${withval}"
        GOT_LOG_HINTS=1
    fi
)

AC_ARG_WITH(log-path,
[  --with-log-path=<path>  Location to store log files at run time],
    if test x$withval = xyes; then
        AC_MSG_ERROR(--with-log-path must be given a pathname)
    else
        AC_DEFINE_UNQUOTED(__DARSHAN_LOG_PATH, "${withval}", Location to store log files at run time)
        __DARSHAN_LOG_PATH="${withval}"
        GOT_LOG_PATH=1
    fi
)

AC_ARG_WITH(jobid-env,
[  --with-jobid-env=<name> Name of environment variable that stores the jobid
                          (specify "NONE" if no appropriate environment variable
                          is available: Darshan will use rank 0's pid instead)],
    if test x$withval = xyes; then
        AC_MSG_ERROR(--with-jobid-env must be given a name)
    else
        AC_DEFINE_UNQUOTED(__DARSHAN_JOBID, "${withval}", Name of the environment variable that stores the jobid)
        __DARSHAN_JOBID="${withval}"
        GOT_JOBID=1
    fi
)

AC_ARG_WITH(mod-mem,
[  --with-mod-mem=<num>    Maximum amount of memory (in MiB) for each Darshan module],
    if test x$withval = xyes; then
        AC_MSG_ERROR(--with-mod-mem must be given a number)
    else
        AC_DEFINE_UNQUOTED(__DARSHAN_MOD_MEM_MAX, ${withval}, Maximum memory (in MiB) for each Darshan module)
    fi
)

if test x$enable_bgq_mod != xno; then
    AC_MSG_CHECKING(for BG/Q environment)
    AC_TRY_COMPILE([
        #ifndef __bgq__
        #error __bgq__ not set
        #endif
        ], [],
        AC_MSG_RESULT(yes)
        DARSHAN_USE_BGQ=1,
        AC_MSG_RESULT(no)
        AS_IF([test "x$enable_bgq_mod" = xyes],
            AC_MSG_ERROR(BG/Q module enabled in non-BG/Q environment),
            []))
fi

if test x$GOT_ALIGNMENT != x1; then
    AC_MSG_ERROR(must provide --with-mem-align=<num> argument to configure.)
fi
if test x$GOT_LOG_PATH != x1; then
    AC_MSG_ERROR(must provide --with-log-path=<path> _or_ --with-log-path-by-env=<variable list> argument to configure.)
fi
if test x$GOT_JOBID != x1; then
    AC_MSG_ERROR(must provide --with-jobid-env=<name> argument to configure.)
fi
__DARSHAN_LOG_HINTS_DEFAULT="romio_no_indep_rw=true;cb_nodes=4"
if test x$GOT_LOG_HINTS != x1; then
dnl use default hints
    AC_DEFINE_UNQUOTED(__DARSHAN_LOG_HINTS, "$__DARSHAN_LOG_HINTS_DEFAULT", Comma-separated list of MPI-IO hints for log file write)
fi

# checks to see how we can print 64 bit values on this architecture
gt_INTTYPES_PRI
if test x$PRI_MACROS_BROKEN == xyes; then
    AC_MSG_ERROR(PRI_xx macros are broken)
else
    AC_CHECK_HEADERS(inttypes.h, , [AC_MSG_ERROR(Couldn't find inttypes.h)])
fi

dnl Check byte ordering
AC_C_BIGENDIAN

dnl temporarily set large file flags just for this test; we don't want
dnl it to propagate to the makefile because of zlib bugs
old_cflags="$CFLAGS"
CFLAGS="$CFLAGS -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE"
AC_MSG_CHECKING(for struct aiocb64)
AC_TRY_COMPILE(
    [
    #include <aio.h>
    ],
    [ struct aiocb64 aiocb; ],
    AC_MSG_RESULT(yes)
    AC_DEFINE(HAVE_AIOCB64, 1, Define if struct aiocb64 type is defined),
    AC_MSG_RESULT(no)
)
CFLAGS="$old_cflags"

dnl temporarily set large file flags just for this test; we don't want
dnl it to propagate to the makefile because of zlib bugs
old_cflags="$CFLAGS"
CFLAGS="$CFLAGS -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE"
AC_MSG_CHECKING(for off64_t)
AC_TRY_COMPILE(
    [
    #include <stdio.h>
    #include <unistd.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <fcntl.h>
    #include <stdarg.h>
    #include <string.h>
    #include <time.h>
    #include <stdlib.h>
    #include <errno.h>
    #include <sys/uio.h>
    #include <pthread.h>
    #include <sys/mman.h>
    #include <search.h>
    #include <assert.h>
    ],
    [ off64_t off; ],
    AC_MSG_RESULT(yes)
    AC_DEFINE(HAVE_OFF64_T, 1, Define if off64_t type is defined),
    AC_MSG_RESULT(no)
)
CFLAGS="$old_cflags"

AC_CHECK_HEADERS(mntent.h sys/mount.h)

# We need to know the value of the $libdir and $bindir variables so that 
# we can reference the correct path in the darshan compiler wrappers.  
# Unfortunately, those two variables are not normally evaluated by autoconf.  
# They are evaluated at build time using Makefile variable substitutions.  
# 
# The following logic was copied from mpich2 1.3.1 to resolve the $libdir
# variable at configure time.
#
# Temporarily replace the default NONE value for exec_prefix
# and prefix with the actual, default values.
savePrefix=$prefix
saveExecprefix=$exec_prefix
test "x$prefix" = xNONE && prefix=$ac_default_prefix
test "x$exec_prefix" = xNONE && exec_prefix=$prefix
eval darshan_lib_path=$libdir
eval darshan_share_path=$datarootdir
prefix=$savePrefix
exec_prefix=$saveExecprefix

# determine if the MPI library includes MPI-IO functions or not
AC_MSG_CHECKING(for MPI-IO support in MPI)
AC_TRY_LINK([#include <mpi.h>], [
    MPI_Comm comm;
    char* filename;
    int amode;
    MPI_Info info;
    MPI_File fh;
    MPI_File_open(comm, filename, amode, info, &fh);
],
    AC_MSG_RESULT(yes),
    AC_MSG_ERROR(Darshan requires a version of MPI with MPI-IO support)
)

# At some point MPI-IO converted most API functions to be const correct.  We
# need to test for this to determine how to define MPI-IO wrappers in
# Darshan.  First we try compiling without cost qualifiers.
AC_MSG_CHECKING(for MPI-IO prototypes without const qualifier)
AC_TRY_COMPILE(
    [
    #include <mpi.h>
    int MPI_File_open(MPI_Comm comm, char *filename, int amode, 
        MPI_Info info, MPI_File *fh)
        {return 0;}
    ],
    [],
    AC_MSG_RESULT(yes),
    AC_MSG_RESULT(no)

    # unable to compile without const qualifiers.  Let's try again with
    # const qualifiers.
    AC_MSG_CHECKING(for MPI-IO prototypes with const qualifier)
    AC_TRY_COMPILE(
        [
        #include <mpi.h>
        int MPI_File_open(MPI_Comm comm, const char *filename, int amode, 
            MPI_Info info, MPI_File *fh)
            {return 0;}
        ],
        [],
        AC_MSG_RESULT(yes)
        AC_DEFINE(HAVE_MPIIO_CONST, 1, Define if MPI-IO prototypes use const qualifier),
        ,
        AC_MSG_ERROR(Darshan is unable to find a compatible MPI_File_open prototype)
    )
)

# determine if mpicc can create shared libraries that use MPI functions
old_cflags="$CFLAGS"
CFLAGS="$CFLAGS -shared -fpic -DPIC"
old_libs="$LIBS"
LIBS="$LIBS -ldl"
AC_MSG_CHECKING(for shared libraries in MPI)
AC_TRY_LINK([#include <mpi.h>], [
    int size;
    MPI_Comm_size(MPI_COMM_WORLD, &size);
],
    AC_MSG_RESULT(yes),
    AC_MSG_RESULT(no)
    AC_MSG_WARN(mpicc doesn't support shared objects; disabling LD_PRELOAD library)
    DISABLE_LDPRELOAD="1"
)
CFLAGS="$old_cflags"
LIBS="$old_libs"

# if this version of mpi defines an MPIO_Request type, then we assume that 
# we should use it in the nonblocking MPI-IO functions.  This is necessary 
# for MPI 1.x implementations that did not use generalized requests yet in 
# MPI-IO.  Later MPI implementations might typedef MPIO_Request to MPI_Request
# so there is no  harm in using the former if it is available there.
AC_CHECK_TYPE([MPIO_Request], 
		AC_DEFINE(__D_MPI_REQUEST, MPIO_Request, Generalized request type for MPI-IO)
	, 
		AC_DEFINE(__D_MPI_REQUEST, MPI_Request, Generalized request type for MPI-IO)
	,[#include <mpi.h>])

# attempt to detect library naming convention in mpi compiler script
AS_IF([$CC -show foo.c -o foo >& /dev/null],
	AC_MSG_CHECKING(for old (pre-3.1.1) style MPICH library naming convention)
	AS_IF([$CC -show foo.c -o foo |grep lmpich >& /dev/null], 
	    AC_MSG_RESULT(yes)
	    MPICH_LIB_OLD=1,
	    AC_MSG_RESULT(no)
	    MPICH_LIB_OLD=0),
	MPICH_LIB_OLD=0)

DARSHAN_VERSION="AC_PACKAGE_VERSION"
AC_SUBST(darshan_lib_path)
AC_SUBST(darshan_share_path)
AC_SUBST(LDFLAGS)
AC_SUBST(__DARSHAN_LOG_PATH)
AC_SUBST(DISABLE_LDPRELOAD)
AC_SUBST(ENABLE_MMAP_LOGS)
AC_SUBST(DARSHAN_VERSION)
AC_SUBST(MPICH_LIB_OLD)
AC_SUBST(DARSHAN_USE_BGQ)
AC_OUTPUT(Makefile
darshan-mk-log-dirs.pl
darshan-gen-cc.pl
darshan-gen-cxx.pl
darshan-gen-fortran.pl
darshan-config
share/craype-1.x/darshan-module
share/craype-2.x/darshan-module
lib/pkgconfig/darshan-runtime.pc
share/mpi-profile/darshan-cc.conf
share/mpi-profile/darshan-cxx.conf
share/mpi-profile/darshan-f.conf
share/mpi-profile/darshan-bg-cc.conf
share/mpi-profile/darshan-bg-cxx.conf
share/mpi-profile/darshan-bg-f.conf
share/ld-opts/darshan-base-ld-opts
)