#------------------------------------------------------------------------------
# $Id$
#------------------------------------------------------------------------------

AC_PREREQ(2.59)
AC_INIT([ethercat],[1.2.0],[fp@igh-essen.com])
AC_CONFIG_AUX_DIR([autoconf])
AM_INIT_AUTOMAKE([-Wall -Werror dist-bzip2])
AC_PREFIX_DEFAULT([/opt/etherlab])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_SRCDIR([config.h.in])

#------------------------------------------------------------------------------
# Global
#------------------------------------------------------------------------------

branch=stable

AC_DEFINE_UNQUOTED(BRANCH, ["$branch"], [Subversion branch])
AC_SUBST(BRANCH, [$branch])

#------------------------------------------------------------------------------
# Linux sources
#------------------------------------------------------------------------------

AC_ARG_WITH([linux-dir],
    AC_HELP_STRING(
        [--with-linux-dir=<DIR>],
        [Linux kernel sources @<:@running kernel@:>@]
    ),
    [
        sourcedir=[$withval]
    ],
    [
        version=[`uname -r`]
        modulesdir=/lib/modules/${version}
        if test \! -d ${modulesdir} || test \! -d ${modulesdir}/build; then
           echo
           AC_MSG_ERROR([Failed to find Linux sources. Use --with-linux-dir!])
        fi
        sourcedir=`cd ${modulesdir}/build && pwd -P`
    ]
)

AC_MSG_CHECKING([for Linux kernel sources])

if test \! -r ${sourcedir}/.config; then
    echo
    AC_MSG_ERROR([No configured Linux kernel sources in $sourcedir])
fi

# Try to get kernel release string
if test -r ${sourcedir}/include/config/kernel.release; then
    kernelrelease=`cat $sourcedir/include/config/kernel.release`
elif test -r ${sourcedir}/.kernelrelease; then
    kernelrelease=`cat $sourcedir/.kernelrelease`
elif test -r ${sourcedir}/include/linux/utsrelease.h; then
    hdr=${sourcedir}/include/linux/utsrelease.h
    kernelrelease=`grep UTS_RELEASE $hdr | cut -d " " -f 3- | tr -d \"`
elif test -r ${sourcedir}/include/linux/version.h; then
    hdr=${sourcedir}/include/linux/version.h
    kernelrelease=`grep UTS_RELEASE $hdr | cut -d " " -f 3- | tr -d \"`
fi

if test -z "$kernelrelease"; then
    echo
    AC_MSG_ERROR([Failed to extract Linux kernel version!])
fi

# Extract three numbers from kernel release string
linuxversion=`echo $kernelrelease | grep -oE "^[[0-9]]+\.[[0-9]]+\.[[0-9]]+"`

AC_SUBST(LINUX_SOURCE_DIR,[$sourcedir])
AC_SUBST(LINUX_KERNEL_RELEASE,[$kernelrelease])
AC_SUBST(LINUX_KERNEL_VERSION,[$linuxversion])
AC_SUBST(LINUX_MOD_PATH,[/lib/modules/$kernelrelease/ethercat])
AC_MSG_RESULT([$LINUX_SOURCE_DIR (Kernel $LINUX_KERNEL_RELEASE)])

#------------------------------------------------------------------------------
# 8139too Kernel
#------------------------------------------------------------------------------

AC_ARG_WITH([8139too-kernel],
    AC_HELP_STRING(
        [--with-8139too-kernel=<X.Y.Z>],
        [8139too kernel (only if differing)]
    ),
    [
        kernel8139too=[$withval]
    ],
    [
        kernel8139too=$linuxversion
    ]
)

AC_MSG_CHECKING([for kernel for 8139too driver])

kernels=`ls -1 devices/ | grep -oE "^8139too-.*-" | cut -d "-" -f 2 | uniq`
found=0
for k in $kernels; do
    if test "$kernel8139too" = "$k"; then
        found=1
    fi
done
if test $found -ne 1; then
    AC_MSG_ERROR([kernel $kernel8139too not available for 8139too driver!])
fi

AC_MSG_RESULT([$kernel8139too])

#------------------------------------------------------------------------------
# RTAI path (optional)
#------------------------------------------------------------------------------

AC_ARG_WITH([rtai-dir],
    AC_HELP_STRING(
        [--with-rtai-dir=<DIR>],
        [RTAI path (only for RTAI examples)]
    ),
    [
        rtaidir=[$withval]
    ],
    [
        rtaidir=""
    ]
)

AC_MSG_CHECKING([for RTAI path])

if test -z "${rtaidir}"; then
    AC_MSG_RESULT([not specified.])
else
    if test \! -r ${rtaidir}/include/rtai.h; then
        AC_MSG_ERROR([no RTAI installation found in ${rtaidir}!])
    fi
    AC_MSG_RESULT([$rtaidir])
    AC_SUBST(RTAI_DIR,[$rtaidir])
fi

#------------------------------------------------------------------------------
# MSR path (optional)
#------------------------------------------------------------------------------

AC_ARG_WITH([msr-dir],
    AC_HELP_STRING(
        [--with-msr-dir=<DIR>],
        [MSR path (only for MSR example)]
    ),
    [
        msrdir=[$withval]
    ],
    [
        msrdir=""
    ]
)

AC_MSG_CHECKING([for MSR path])

if test -z "${msrdir}"; then
    AC_MSG_RESULT([not specified.])
else
    if test \! -r ${msrdir}/include/msr.h; then
        AC_MSG_ERROR([no MSR installation found in ${msrdir}!])
    fi
    AC_MSG_RESULT([$msrdir])
    AC_SUBST(MSR_DIR,[$msrdir])
fi

#------------------------------------------------------------------------------
# Debug interface
#------------------------------------------------------------------------------

AC_ARG_ENABLE([dbg-if],
    AS_HELP_STRING([--enable-dbg-if],
                   [Create a debug interface for each master @<:@NO@:>@]),
    [
        case "${enableval}" in
            yes) dbg=1
                AC_DEFINE([EC_DBG_IF], [1], [Debug interfaces enabled])
                ;;
            no) dbg=0
                ;;
            *) AC_MSG_ERROR([Invalid value for --enable-dbg-if])
                ;;
        esac
    ],
    [dbg=0]
)

AM_CONDITIONAL(EC_DBG_IF, test "x$dbg" = x1)
AC_SUBST([EC_DBG_IF],${dbg})

#------------------------------------------------------------------------------

# Create config.kbuild

echo configure: creating config.kbuild...

cat > config.kbuild <<EOF
# config.kbuild - created by configure
EC_DBG_IF := ${dbg}
EC_8139TOO_KERNEL := ${kernel8139too}
EC_RTAI_DIR := "${rtaidir}"
EC_MSR_DIR := "${msrdir}"
EOF

#------------------------------------------------------------------------------

AC_CONFIG_FILES([
        Makefile
        master/Makefile
        devices/Makefile
        script/Makefile
        script/init.d/Makefile
        script/sysconfig/Makefile
        include/Makefile
        examples/Makefile
        examples/mini/Makefile
        examples/rtai/Makefile
        examples/msr/Makefile
])
AC_OUTPUT

#------------------------------------------------------------------------------