dnl #
dnl # /usr/share/aclocal/libmcpu.m4
dnl #
dnl # Configure paths for libmcpu
dnl # Andrey V.Kosteltsev

dnl ============================================================
dnl
dnl  Synopsis:
dnl     AC_CHECK_LIBMCPU([MIN-VERSION [,             # minimum libmcpu version, e.g. 0.4.1
dnl                       DEFAULT-WITH-LIBMCPU [,    # default value for --with-libmcpu option
dnl                       ACTION-IF-FOUND [,         # action to perform if libmcpu was found
dnl                       ACTION-IF-NOT-FOUND        # action to perform if libmcpu was not found
dnl                      ]]]])
dnl  Examples:
dnl     AC_CHECK_LIBMCPU(0.4.1)
dnl     AC_CHECK_LIBMCPU(0.4.1,,,CFLAGS="$CFLAGS -DHAVE_LIBMCPU $LIBMCPU_CFLAGS")
dnl     AC_CHECK_LIBMCPU(0.4.1,yes,CFLAGS="$CFLAGS -DHAVE_LIBMCPU")
dnl
dnl
dnl  If you have to change prefix returned by mcpu-config script or change
dnl  location of mcpu-config, you may set environment variable LIBMCPU_CONFIG,
dnl  for example:
dnl
dnl  # export LIBMCPU_CONFIG="/usr/bin/mcpu-config"
dnl
dnl ============================================================
dnl
dnl ============================================================
dnl  auxilliary macros
dnl ============================================================
AC_DEFUN([_AC_LIBMCPU_ERROR], [dnl
AC_MSG_RESULT([*FAILED*])
cat <<EOT | sed -e 's/^[[ 	]]*/ | /' -e 's/>>/  /' 1>&2
$1
EOT
exit 1
])

AC_DEFUN([_AC_LIBMCPU_VERBOSE], [dnl
if test "x$verbose" = "xyes"; then
    AC_MSG_RESULT([  $1])
fi
])

dnl ============================================================
dnl  the user macro
dnl ============================================================
AC_DEFUN([AC_CHECK_LIBMCPU], [dnl
dnl
dnl ============================================================
dnl  prerequisites
dnl ============================================================
AC_REQUIRE([AC_PROG_CC])dnl
AC_REQUIRE([AC_PROG_CPP])dnl
dnl
dnl ============================================================
dnl  set LIBMCPU_CONFIG variable
dnl ============================================================
if test -z "$LIBMCPU_CONFIG"; then
  LIBMCPU_CONFIG='mcpu-config'
fi
dnl
LIBMCPU_CPPFLAGS=''
LIBMCPU_CFLAGS=''
LIBMCPU_LDFLAGS=''
LIBMCPU_LIBS=''
AC_SUBST(LIBMCPU_CPPFLAGS)
AC_SUBST(LIBMCPU_CFLAGS)
AC_SUBST(LIBMCPU_LDFLAGS)
AC_SUBST(LIBMCPU_LIBS)
dnl
dnl ============================================================
dnl  command line options
dnl ============================================================
AC_MSG_CHECKING(for libmcpu)
_AC_LIBMCPU_VERBOSE([])
AC_ARG_WITH(libmcpu,dnl
[  --with-libmcpu[=yes|no]  Build with libmcpu Library  (default=]ifelse([$2],,yes,$2)[)],dnl
,dnl
with_libmcpu="ifelse([$2],,yes,$2)"
)dnl
_AC_LIBMCPU_VERBOSE([+ Command Line Options:])
_AC_LIBMCPU_VERBOSE([    o --with-libmcpu=$with_libmcpu])
dnl
dnl ============================================================
dnl  configuration
dnl ============================================================
if test "x$with_libmcpu" != "xno"; then
    libmcpu_version=""
    libmcpu_location=""
    libmcpu_type=""
    libmcpu_cppflags=""
    libmcpu_cflags=""
    libmcpu_ldflags=""
    libmcpu_libs=""
    if test "x$with_libmcpu" = "xyes"; then
        #   via config script in $PATH
        changequote(, )dnl
        libmcpu_version=`($LIBMCPU_CONFIG --version) 2>/dev/null |\
                        sed -e 's/^.*\([0-9]\.[0-9]*[ab.][0-9]*\).*$/\1/'`
        changequote([, ])dnl
        if test "x$libmcpu_version" != "x"; then
            libmcpu_location=`$LIBMCPU_CONFIG --prefix`
            libmcpu_type='installed'
            libmcpu_cppflags=`$LIBMCPU_CONFIG --cppflags`
            libmcpu_cflags=`$LIBMCPU_CONFIG --cflags`
            libmcpu_ldflags=`$LIBMCPU_CONFIG --ldflags`
            libmcpu_libs=`$LIBMCPU_CONFIG --libs`
        fi
    fi
    dnl ========================================================
    dnl  Check whether the found version is sufficiently new
    dnl ========================================================
    _req_version="ifelse([$1],,1.0.0,$1)"
    for _var in libmcpu_version _req_version; do
        eval "_val=\"\$${_var}\""
        _major=`echo $_val | sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\([[ab.]]\)\([[0-9]]*\)/\1/'`
        _minor=`echo $_val | sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\([[ab.]]\)\([[0-9]]*\)/\2/'`
        _rtype=`echo $_val | sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\([[ab.]]\)\([[0-9]]*\)/\3/'`
        _micro=`echo $_val | sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\([[ab.]]\)\([[0-9]]*\)/\4/'`
        case $_rtype in
            "a" ) _rtype=0 ;;
            "b" ) _rtype=1 ;;
            "." ) _rtype=2 ;;
        esac
        _hex=`echo dummy | awk '{ printf("%d%02d%1d%02d", major, minor, rtype, micro); }' \
              "major=$_major" "minor=$_minor" "rtype=$_rtype" "micro=$_micro"`
        eval "${_var}_hex=\"\$_hex\""
    done
    _AC_LIBMCPU_VERBOSE([+ Determined Versions:])
    _AC_LIBMCPU_VERBOSE([    o existing: $libmcpu_version -> 0x$libmcpu_version_hex])
    _AC_LIBMCPU_VERBOSE([    o required: $_req_version -> 0x$_req_version_hex])
    _ok=0
    if test "x$libmcpu_version_hex" != "x"; then
        if test "x$_req_version_hex" != "x"; then
            if test $libmcpu_version_hex -ge $_req_version_hex; then
                _ok=1
            fi
        fi
    fi
    if test "x$_ok" = "x0"; then
        _AC_LIBMCPU_ERROR([dnl
        Found libmcpu version $libmcpu_version, but required at least version $_req_version.
        Upgrade libmcpu under $libmcpu_location to $_req_version or higher first, please.])
    fi
    dnl ========================================================
    dnl  Perform libmcpu Sanity Compile Check
    dnl ========================================================
    _ac_save_CPPFLAGS="$CPPFLAGS"
    _ac_save_CFLAGS="$CFLAGS"
    _ac_save_LDFLAGS="$LDFLAGS"
    _ac_save_LIBS="$LIBS"
    CPPFLAGS="$CPPFLAGS $libmcpu_cppflags"
    CFLAGS="$CFLAGS $libmcpu_cflags"
    LDFLAGS="$LDFLAGS $libmcpu_ldflags"
    LIBS="$LIBS $libmcpu_libs"
    _AC_LIBMCPU_VERBOSE([+ Test Build Environment:])
    _AC_LIBMCPU_VERBOSE([    o CPPFLAGS="$CPPFLAGS"])
    _AC_LIBMCPU_VERBOSE([    o CFLAGS="$CFLAGS"])
    _AC_LIBMCPU_VERBOSE([    o LDFLAGS="$LDFLAGS"])
    _AC_LIBMCPU_VERBOSE([    o LIBS="$LIBS"])
    cross_compile=no
    _AC_LIBMCPU_VERBOSE([+ Performing Sanity Checks:])
    _AC_LIBMCPU_VERBOSE([    o pre-processor test])
    AC_PREPROC_IFELSE([AC_LANG_SOURCE([[
#include <libmcpu.h>
    ]])], _ok=yes, _ok=no)
    if test "x$_ok" != "xyes"; then
        _AC_LIBMCPU_ERROR([dnl
        Found libmcpu $libmcpu_version under $libmcpu_location, but
        was unable to perform a sanity pre-processor check. This means
        the libmcpu header libmcpu.h was not found.
        We used the following build environment:
        >> CPP="$CPP"
        >> CPPFLAGS="$CPPFLAGS"
        See config.log for possibly more details.])
    fi
    _AC_LIBMCPU_VERBOSE([    o link check])
    AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <libmcpu.h>

int main()
{
  __cpu_init();

  __cpu_free_context();

  return( 0 );
}
    ]])], _ok=yes, _ok=no)
    if test "x$_ok" != "xyes"; then
        _AC_LIBMCPU_ERROR([dnl
        Found libmcpu $libmcpu_version under $libmcpu_location, but
        was unable to perform a sanity linker check. This means
        the libmcpu library libmcpu.a was not found.
        We used the following build environment:
        >> CC="$CC"
        >> CFLAGS="$CFLAGS"
        >> LDFLAGS="$LDFLAGS"
        >> LIBS="$LIBS"
        See config.log for possibly more details.])
    fi
    CPPFLAGS="$_ac_save_CPPFLAGS"
    CFLAGS="$_ac_save_CFLAGS"
    LDFLAGS="$_ac_save_LDFLAGS"
    LIBS="$_ac_save_LIBS"

    LIBMCPU_CPPFLAGS="$libmcpu_cppflags"
    LIBMCPU_CFLAGS="$libmcpu_cflags"
    LIBMCPU_LDFLAGS="$libmcpu_ldflags"
    LIBMCPU_LIBS="$libmcpu_libs"
    AC_SUBST(LIBMCPU_CPPFLAGS)
    AC_SUBST(LIBMCPU_CFLAGS)
    AC_SUBST(LIBMCPU_LDFLAGS)
    AC_SUBST(LIBMCPU_LIBS)
    _AC_LIBMCPU_VERBOSE([+ Final Results:])
    _AC_LIBMCPU_VERBOSE([    o LIBMCPU_CPPFLAGS="$LIBMCPU_CPPFLAGS"])
    _AC_LIBMCPU_VERBOSE([    o LIBMCPU_CFLAGS="$LIBMCPU_CFLAGS"])
    _AC_LIBMCPU_VERBOSE([    o LIBMCPU_LDFLAGS="$LIBMCPU_LDFLAGS"])
    _AC_LIBMCPU_VERBOSE([    o LIBMCPU_LIBS="$LIBMCPU_LIBS"])
fi
if test "x$with_libmcpu" != "xno"; then
    AC_MSG_RESULT([version $libmcpu_version, $libmcpu_type under $libmcpu_location])
    ifelse([$3], , :, [$3])
else
    AC_MSG_RESULT([no])
    ifelse([$4], , :, [$4])
fi
])