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# Extra autoconf macros for the Glasgow fptools
#
# To be a good autoconf citizen, names of local macros have prefixed with FP_ to
# ensure we don't clash with any pre-supplied autoconf ones.
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# FPTOOLS_SET_PLATFORM_VARS
# ----------------------------------
# Set the platform variables
AC_DEFUN([FPTOOLS_SET_PLATFORM_VARS],
[
    # If no argument was given for a configuration variable, then discard
    # the guessed canonical system and use the configuration of the
    # bootstrapping ghc. If an argument was given, map it from gnu format
    # to ghc format.
    #
    # For why we do it this way, see: #3637, #1717, #2951
    #
    # In bindists, we haven't called AC_CANONICAL_{BUILD,HOST,TARGET}
    # so this justs uses $bootstrap_target.

    if test "$build_alias" = ""
    then
        if test "$bootstrap_target" != ""
        then
            build=$bootstrap_target
            echo "Build platform inferred as: $build"
        else
            echo "Can't work out build platform"
            exit 1
        fi

        BuildArch=`echo "$build" | sed 's/-.*//'`
        BuildVendor=`echo "$build" | sed -e 's/.*-\(.*\)-.*/\1/'`
        BuildOS=`echo "$build" | sed 's/.*-//'`
    else
        GHC_CONVERT_CPU([$build_cpu], [BuildArch])
        GHC_CONVERT_VENDOR([$build_vendor], [BuildVendor])
        GHC_CONVERT_OS([$build_os], [BuildOS])
    fi

    if test "$host_alias" = ""
    then
        if test "$bootstrap_target" != ""
        then
            host=$bootstrap_target
            echo "Host platform inferred as: $host"
        else
            echo "Can't work out host platform"
            exit 1
        fi

        HostArch=`echo "$host" | sed 's/-.*//'`
        HostVendor=`echo "$host" | sed -e 's/.*-\(.*\)-.*/\1/'`
        HostOS=`echo "$host" | sed 's/.*-//'`
    else
        GHC_CONVERT_CPU([$host_cpu], [HostArch])
        GHC_CONVERT_VENDOR([$host_vendor], [HostVendor])
        GHC_CONVERT_OS([$host_os], [HostOS])
    fi

    if test "$target_alias" = ""
    then
        if test "$bootstrap_target" != ""
        then
            target=$bootstrap_target
            echo "Target platform inferred as: $target"
        else
            echo "Can't work out target platform"
            exit 1
        fi

        TargetArch=`echo "$target" | sed 's/-.*//'`
        TargetVendor=`echo "$target" | sed -e 's/.*-\(.*\)-.*/\1/'`
        TargetOS=`echo "$target" | sed 's/.*-//'`
    else
        GHC_CONVERT_CPU([$target_cpu], [TargetArch])
        GHC_CONVERT_VENDOR([$target_vendor], [TargetVendor])
        GHC_CONVERT_OS([$target_os], [TargetOS])
    fi
])


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# FPTOOLS_SET_C_LD_FLAGS
# ----------------------------------
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# Set the C, LD and CPP flags for a given platform
# $1 is the platform
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# $2 is the name of the CC flags variable
# $3 is the name of the linker flags variable when linking with gcc
# $4 is the name of the linker flags variable when linking with ld
# $5 is the name of the CPP flags variable
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AC_DEFUN([FPTOOLS_SET_C_LD_FLAGS],
[
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    AC_MSG_CHECKING([Setting up $2, $3, $4 and $5])
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    case $$1 in
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    i386-apple-darwin)
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        # By default, gcc on OS X will generate SSE
        # instructions, which need things 16-byte aligned,
        # but we don't 16-byte align things. Thus drop
        # back to generic i686 compatibility. Trac #2983.
        $2="$$2 -march=i686 -m32"
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        $3="$$3 -march=i686 -m32"
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        $4="$$4 -arch i386"
        $5="$$5 -march=i686 -m32"
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        ;;
    x86_64-apple-darwin)
        $2="$$2 -m64"
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        $3="$$3 -m64"
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        $4="$$4 -arch x86_64"
        $5="$$5 -m64"
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        ;;
    esac
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    case $$1 in
    i386-apple-darwin|x86_64-apple-darwin)
        # We support back to OS X 10.5
        $2="$$2 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5"
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        $3="$$3 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5"
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        $4="$$4  -macosx_version_min 10.5"
        $5="$$5 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5"
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        ;;
    esac

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    # If gcc knows about the stack protector, turn it off.
    # Otherwise the stack-smash handler gets triggered.
    echo 'int main(void) {return 0;}' > conftest.c
    if $CC -c conftest.c -fno-stack-protector > /dev/null 2>&1
    then
        $2="$$2 -fno-stack-protector"
    fi
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    rm -f conftest.c conftest.o
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    AC_MSG_RESULT([done])
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])


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# FP_VISIBILITY_HIDDEN
# ----------------------------------
# Is the visibility hidden attribute supported?
AC_DEFUN([FP_VISIBILITY_HIDDEN],
[
    AC_MSG_CHECKING([whether __attribute__((visibility("hidden"))) is supported])
    echo '__attribute__((visibility("hidden"))) void foo(void) {}' > conftest.c
    if $CC -Wall -Werror -c conftest.c > /dev/null 2>&1
    then
        AC_MSG_RESULT([yes])
        AC_DEFINE(HAS_VISIBILITY_HIDDEN, 1, [Has visibility hidden])
    else
        AC_MSG_RESULT([no])
    fi
    rm -f conftest.c conftest.o
])


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# FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN
# ----------------------------------
# Little endian Arm on Linux with some ABIs has big endian word order
# in doubles. Define FLOAT_WORDS_BIGENDIAN if this is the case.
AC_DEFUN([FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN],
  [AC_CACHE_CHECK([whether float word order is big endian], [fptools_cv_float_word_order_bigendian],
    [AC_COMPILE_IFELSE(
      [AC_LANG_PROGRAM(
        [#include <endian.h>],
        [#if defined(__FLOAT_WORD_ORDER) && __FLOAT_WORD_ORDER == BIG_ENDIAN
             return 0;
         #else
             not float word order big endian
         #endif]
      )],
      [fptools_cv_float_word_order_bigendian=yes],
      [fptools_cv_float_word_order_bigendian=no])
    ])
  case $fptools_cv_float_word_order_bigendian in
      yes)
          AC_DEFINE([FLOAT_WORDS_BIGENDIAN], 1,
          [Define to 1 if your processor stores words of floats with
           the most significant byte first]) ;;
  esac
])


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# FP_EVAL_STDERR(COMMAND)
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# -----------------------
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# Eval COMMAND, save its stderr (without lines resulting from shell tracing)
# into the file conftest.err and the exit status in the variable fp_status.
AC_DEFUN([FP_EVAL_STDERR],
[{ (eval $1) 2>conftest.er1
  fp_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  (exit $fp_status); }[]dnl
])# FP_EVAL_STDERR


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# FP_ARG_WITH_PATH_GNU_PROG
# --------------------
# XXX
#
# $1 = the command to look for
# $2 = the variable to set
#
AC_DEFUN([FP_ARG_WITH_PATH_GNU_PROG],
[
AC_ARG_WITH($2,
[AC_HELP_STRING([--with-$2=ARG],
        [Use ARG as the path to $2 [default=autodetect]])],
[
    if test "$HostOS" = "mingw32"
    then
        AC_MSG_WARN([Request to use $withval will be ignored])
    else
        $1=$withval
    fi
],
[
    if test "$HostOS" != "mingw32"
    then
        AC_PATH_PROG([$1], [$2])
        if test -z "$$1"
        then
            AC_MSG_ERROR([cannot find $2 in your PATH, no idea how to link])
        fi
    fi
]
)
]) # FP_ARG_WITH_PATH_GNU_PROG


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# FP_PROG_CONTEXT_DIFF
# --------------------
# Figure out how to do context diffs. Sets the output variable ContextDiffCmd.
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#
# Note: NeXTStep thinks diff'ing a file against itself is "trouble".
#
# Used by ghc, glafp-utils/ltx, and glafp-utils/runstdtest.
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AC_DEFUN([FP_PROG_CONTEXT_DIFF],
[AC_CACHE_CHECK([for a working context diff], [fp_cv_context_diff],
[echo foo > conftest1
echo foo > conftest2
fp_cv_context_diff=no
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for fp_var in '-U 1' '-u1' '-C 1' '-c1'
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do
  if diff $fp_var conftest1 conftest2 > /dev/null 2>&1; then
    fp_cv_context_diff="diff $fp_var"
    break
  fi
done])
if test x"$fp_cv_context_diff" = xno; then
   AC_MSG_ERROR([cannot figure out how to do context diffs])
fi
AC_SUBST(ContextDiffCmd, [$fp_cv_context_diff])
])# FP_PROG_CONTEXT_DIFF


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# FP_COMPUTE_INT(EXPRESSION, VARIABLE, INCLUDES, IF-FAILS)
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# --------------------------------------------------------
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# Assign VARIABLE the value of the compile-time EXPRESSION using INCLUDES for
# compilation. Execute IF-FAILS when unable to determine the value. Works for
# cross-compilation, too.
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#
# Implementation note: We are lazy and use an internal autoconf macro, but it
# is supported in autoconf versions 2.50 up to the actual 2.57, so there is
# little risk.
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AC_DEFUN([FP_COMPUTE_INT],
[_AC_COMPUTE_INT([$1], [$2], [$3], [$4])[]dnl
])# FP_COMPUTE_INT


# FP_CHECK_ALIGNMENT(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES])
# ------------------------------------------------------------------
# A variation of AC_CHECK_SIZEOF for computing the alignment restrictions of a
# given type. Defines ALIGNMENT_TYPE.
AC_DEFUN([FP_CHECK_ALIGNMENT],
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[AS_LITERAL_IF(m4_translit([[$1]], [*], [p]), [],
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               [AC_FATAL([$0: requires literal arguments])])[]dnl
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AC_CHECK_TYPE([$1], [], [], [$3])[]dnl
m4_pushdef([fp_Cache], [AS_TR_SH([fp_cv_alignment_$1])])[]dnl
AC_CACHE_CHECK([alignment of $1], [fp_Cache],
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[if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
  FP_COMPUTE_INT([(long) (&((struct { char c; $1 ty; } *)0)->ty)],
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                 [fp_Cache],
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                 [AC_INCLUDES_DEFAULT([$3])],
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                 [AC_MSG_ERROR([cannot compute alignment ($1)
See `config.log' for more details.], [77])])
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else
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  fp_Cache=0
fi])[]dnl
AC_DEFINE_UNQUOTED(AS_TR_CPP(alignment_$1), $fp_Cache, [The alignment of a `$1'.])[]dnl
m4_popdef([fp_Cache])[]dnl
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])# FP_CHECK_ALIGNMENT


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# FP_LEADING_UNDERSCORE
# ---------------------
# Test for determining whether symbol names have a leading underscore. We assume
# that they _haven't_ if anything goes wrong. Sets the output variable
# LeadingUnderscore to YES or NO and defines LEADING_UNDERSCORE correspondingly.
#
# Some nlist implementations seem to try to be compatible by ignoring a leading
# underscore sometimes (eg. FreeBSD). We therefore have to work around this by
# checking for *no* leading underscore first. Sigh.  --SDM
#
# Similarly on OpenBSD, but this test doesn't help. -- dons
AC_DEFUN([FP_LEADING_UNDERSCORE],
[AC_CHECK_LIB([elf], [nlist], [LIBS="-lelf $LIBS"])
AC_CACHE_CHECK([leading underscore in symbol names], [fptools_cv_leading_underscore], [
# Hack!: nlist() under Digital UNIX insist on there being an _,
# but symbol table listings shows none. What is going on here?!?
#
# Another hack: cygwin doesn't come with nlist.h , so we hardwire
# the underscoredness of that "platform"
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case $HostPlatform in
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*openbsd*) # x86 openbsd is ELF from 3.4 >, meaning no leading uscore
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  case $build in
    i386-*2\.@<:@0-9@:>@ | i386-*3\.@<:@0-3@:>@ ) fptools_cv_leading_underscore=yes ;;
    *) fptools_cv_leading_underscore=no ;;
  esac ;;
alpha-dec-osf*) fptools_cv_leading_underscore=no;;
*cygwin32) fptools_cv_leading_underscore=yes;;
*mingw32) fptools_cv_leading_underscore=yes;;
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    # HACK: Apple doesn't seem to provide nlist in the 64-bit-libraries
x86_64-apple-darwin*) fptools_cv_leading_underscore=yes;;

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*) AC_RUN_IFELSE([AC_LANG_SOURCE([[#ifdef HAVE_NLIST_H
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#include <nlist.h>
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struct nlist xYzzY1[] = {{"xYzzY1", 0},{0}};
struct nlist xYzzY2[] = {{"_xYzzY2", 0},{0}};
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#endif

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int main(argc, argv)
int argc;
char **argv;
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{
#ifdef HAVE_NLIST_H
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    if(nlist(argv[0], xYzzY1) == 0 && xYzzY1[0].n_value != 0)
        exit(1);
    if(nlist(argv[0], xYzzY2) == 0 && xYzzY2[0].n_value != 0)
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        exit(0);
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#endif
    exit(1);
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}]])],[fptools_cv_leading_underscore=yes],[fptools_cv_leading_underscore=no],[fptools_cv_leading_underscore=no])
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;;
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esac]);
AC_SUBST([LeadingUnderscore], [`echo $fptools_cv_leading_underscore | sed 'y/yesno/YESNO/'`])
if test x"$fptools_cv_leading_underscore" = xyes; then
   AC_DEFINE([LEADING_UNDERSCORE], [1], [Define to 1 if C symbols have a leading underscore added by the compiler.])
fi])# FP_LEADING_UNDERSCORE
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# FP_COMPARE_VERSIONS(VERSION1, TEST, VERSION2, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
# ----------------------------------------------------------------------------------
# Compare dotted version numbers VERSION1 and VERSION2 lexicographically according
# to TEST (one of -eq, -ne, -lt, -le, -gt, or -ge).
AC_DEFUN([FP_COMPARE_VERSIONS],
[fp_version1=$1; fp_version2=$3
fp_save_IFS=$IFS; IFS='.'
while test x"$fp_version1" != x || test x"$fp_version2" != x
do

  set dummy $fp_version1; shift
  fp_num1=""
  test $[@%:@] = 0 || { fp_num1="[$]1"; shift; }
  test x"$fp_num1" = x && fp_num1="0"
  fp_version1="[$]*"

  set dummy $fp_version2; shift
  fp_num2=""
  test $[@%:@] = 0 || { fp_num2="[$]1"; shift; }
  test x"$fp_num2" = x && fp_num2="0"
  fp_version2="[$]*"

  test "$fp_num1" = "$fp_num2" || break;
done
IFS=$fp_save_IFS
AS_IF([test "$fp_num1" $2 "$fp_num2"], [$4], [$5])[]dnl
])# FP_COMPARE_VERSIONS
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dnl
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dnl Check for GreenCard and version.
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dnl
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AC_DEFUN([FPTOOLS_GREENCARD],
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[
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AC_PATH_PROG(GreenCardCmd,greencard)
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AC_CACHE_CHECK([for version of greencard], fptools_cv_greencard_version,
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changequote(, )dnl
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[if test x"$GreenCardCmd" != x; then
   fptools_cv_greencard_version="`$GreenCardCmd --version |
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			  grep 'version' | sed -e 's/greencard. version \([^ ]*\).*/\1/g'`"
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else
   fptools_cv_greencard_version=""
fi
changequote([, ])dnl
])
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FP_COMPARE_VERSIONS([$fptools_cv_greencard_version],[-lt],[$1],
  [AC_MSG_ERROR([greencard version $1 or later is required (found '$fptools_cv_greencard_version')])])[]dnl
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GreenCardVersion=$fptools_cv_greencard_version
AC_SUBST(GreenCardVersion)
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])

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dnl
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dnl Check for Happy and version.  If we're building GHC, then we need
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dnl at least Happy version 1.14.  If there's no installed Happy, we look
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dnl for a happy source tree and point the build system at that instead.
dnl
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AC_DEFUN([FPTOOLS_HAPPY],
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[AC_PATH_PROG(HappyCmd,happy,)
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# Happy is passed to Cabal, so we need a native path
if test "x$HostPlatform"  = "xi386-unknown-mingw32" && \
   test "${OSTYPE}"      != "msys"                  && \
   test "${HappyCmd}"    != ""
then
    # Canonicalise to <drive>:/path/to/gcc
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    HappyCmd=`cygpath -m "${HappyCmd}"`
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    AC_MSG_NOTICE([normalized happy command to $HappyCmd])
fi

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AC_CACHE_CHECK([for version of happy], fptools_cv_happy_version,
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changequote(, )dnl
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[if test x"$HappyCmd" != x; then
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   fptools_cv_happy_version=`"$HappyCmd" -v |
			  grep 'Happy Version' | sed -e 's/Happy Version \([^ ]*\).*/\1/g'` ;
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else
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   fptools_cv_happy_version="";
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fi;
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changequote([, ])dnl
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])
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if test ! -f compiler/parser/Parser.hs || test ! -f compiler/cmm/CmmParse.hs || test ! -f compiler/parser/ParserCore.hs
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then
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    FP_COMPARE_VERSIONS([$fptools_cv_happy_version],[-lt],[1.16],
      [AC_MSG_ERROR([Happy version 1.16 or later is required to compile GHC.])])[]
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fi
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HappyVersion=$fptools_cv_happy_version;
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AC_SUBST(HappyVersion)
])

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dnl
dnl Check for Alex and version.  If we're building GHC, then we need
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dnl at least Alex version 2.0.1.
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dnl
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AC_DEFUN([FPTOOLS_ALEX],
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[
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AC_PATH_PROG(AlexCmd,alex,)
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# Alex is passed to Cabal, so we need a native path
if test "x$HostPlatform"  = "xi386-unknown-mingw32" && \
   test "${OSTYPE}"      != "msys"                  && \
   test "${AlexCmd}"     != ""
then
    # Canonicalise to <drive>:/path/to/gcc
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    AlexCmd=`cygpath -m "${AlexCmd}"`
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fi

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AC_CACHE_CHECK([for version of alex], fptools_cv_alex_version,
changequote(, )dnl
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[if test x"$AlexCmd" != x; then
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   fptools_cv_alex_version=`"$AlexCmd" -v |
			  grep 'Alex [Vv]ersion' | sed -e 's/Alex [Vv]ersion \([0-9\.]*\).*/\1/g'` ;
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else
   fptools_cv_alex_version="";
fi;
changequote([, ])dnl
])
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if test ! -f compiler/cmm/CmmLex.hs || test ! -f compiler/parser/Lexer.hs
then
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    FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[2.1.0],
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      [AC_MSG_ERROR([Alex version 2.1.0 or later is required to compile GHC.])])[]
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fi
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AlexVersion=$fptools_cv_alex_version;
AC_SUBST(AlexVersion)
])

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# FP_PROG_LD_X
# ------------
# Sets the output variable LdXFlag to -x if ld supports this flag, otherwise the
# variable's value is empty.
AC_DEFUN([FP_PROG_LD_X],
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[
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AC_CACHE_CHECK([whether ld understands -x], [fp_cv_ld_x],
[echo 'foo() {}' > conftest.c
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${CC-cc} -c conftest.c
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if ${LdCmd} -r -x -o conftest2.o conftest.o > /dev/null 2>&1; then
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   fp_cv_ld_x=yes
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else
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   fp_cv_ld_x=no
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fi
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rm -rf conftest*])
if test "$fp_cv_ld_x" = yes; then
  LdXFlag=-x
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else
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  LdXFlag=
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fi
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AC_SUBST([LdXFlag])
])# FP_PROG_LD_X


# FP_PROG_LD_IS_GNU
# -----------------
# Sets the output variable LdIsGNULd to YES or NO, depending on whether it is
# GNU ld or not.
AC_DEFUN([FP_PROG_LD_IS_GNU],
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[
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AC_CACHE_CHECK([whether ld is GNU ld], [fp_cv_gnu_ld],
[if ${LdCmd} --version 2> /dev/null | grep "GNU" > /dev/null 2>&1; then
  fp_cv_gnu_ld=yes
else
  fp_cv_gnu_ld=no
fi])
AC_SUBST([LdIsGNULd], [`echo $fp_cv_gnu_ld | sed 'y/yesno/YESNO/'`])
])# FP_PROG_LD_IS_GNU
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# FP_PROG_AR
# ----------
# Sets fp_prog_ar_raw to the full path of ar and fp_prog_ar to a non-Cygwin
# version of it. Exits if no ar can be found
AC_DEFUN([FP_PROG_AR],
[AC_PATH_PROG([fp_prog_ar_raw], [ar])
if test -z "$fp_prog_ar_raw"; then
  AC_MSG_ERROR([cannot find ar in your PATH, no idea how to make a library])
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fi
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fp_prog_ar="$fp_prog_ar_raw"
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case $HostPlatform in
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  *mingw32) if test x${OSTYPE} != xmsys; then
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 	      fp_prog_ar="`cygpath -w "${fp_prog_ar_raw}" | sed -e 's@\\\\@/@g'`"
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              AC_MSG_NOTICE([normalized ar command to $fp_prog_ar])
            fi
            ;;
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esac
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])# FP_PROG_AR


# FP_PROG_AR_IS_GNU
# -----------------
# Sets fp_prog_ar_is_gnu to yes or no, depending on whether it is GNU ar or not.
AC_DEFUN([FP_PROG_AR_IS_GNU],
[AC_REQUIRE([FP_PROG_AR])
AC_CACHE_CHECK([whether $fp_prog_ar_raw is GNU ar], [fp_cv_prog_ar_is_gnu],
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[if "$fp_prog_ar_raw" --version 2> /dev/null | grep "GNU" > /dev/null 2>&1; then
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  fp_cv_prog_ar_is_gnu=yes
else
  fp_cv_prog_ar_is_gnu=no
fi])
fp_prog_ar_is_gnu=$fp_cv_prog_ar_is_gnu
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AC_SUBST([ArIsGNUAr], [`echo $fp_prog_ar_is_gnu | tr 'a-z' 'A-Z'`])
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])# FP_PROG_AR_IS_GNU


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# FP_PROG_AR_SUPPORTS_ATFILE
# -----------------
# Sets fp_prog_ar_supports_atfile to yes or no, depending on whether
# or not it supports the @file syntax
AC_DEFUN([FP_PROG_AR_SUPPORTS_ATFILE],
[AC_REQUIRE([FP_PROG_AR])
 AC_REQUIRE([FP_PROG_AR_ARGS])
AC_CACHE_CHECK([whether $fp_prog_ar_raw supports @file], [fp_cv_prog_ar_supports_atfile],
[
rm -f conftest*
touch conftest.file
echo conftest.file  > conftest.atfile
echo conftest.file >> conftest.atfile
"$fp_prog_ar_raw" $fp_prog_ar_args conftest.a @conftest.atfile > /dev/null 2>&1
fp_prog_ar_supports_atfile_tmp=`"$fp_prog_ar_raw" t conftest.a 2> /dev/null | grep -c conftest.file`
rm -f conftest*
if test "$fp_prog_ar_supports_atfile_tmp" -eq 2
then
  fp_cv_prog_ar_supports_atfile=yes
else
  fp_cv_prog_ar_supports_atfile=no
fi])
fp_prog_ar_supports_atfile=$fp_cv_prog_ar_supports_atfile
AC_SUBST([ArSupportsAtFile], [`echo $fp_prog_ar_supports_atfile | tr 'a-z' 'A-Z'`])
])# FP_PROG_AR_SUPPORTS_ATFILE

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# FP_PROG_AR_ARGS
# ---------------
# Sets fp_prog_ar_args to the arguments for ar and the output variable ArCmd
# to a non-Cygwin invocation of ar including these arguments.
AC_DEFUN([FP_PROG_AR_ARGS],
[AC_REQUIRE([FP_PROG_AR_IS_GNU])
AC_CACHE_CHECK([for ar arguments], [fp_cv_prog_ar_args],
[
# GNU ar needs special treatment: it appears to have problems with
# object files with the same name if you use the 's' modifier, but
# simple 'ar q' works fine, and doesn't need a separate ranlib.
if test $fp_prog_ar_is_gnu = yes; then
  fp_cv_prog_ar_args="q"
else
  touch conftest.dummy
  for fp_var in clqsZ clqs cqs clq cq ; do
     rm -f conftest.a
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     if "$fp_prog_ar_raw" $fp_var conftest.a conftest.dummy > /dev/null 2> /dev/null; then
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        fp_cv_prog_ar_args=$fp_var
        break
     fi
  done
  rm -f conftest*
  if test -z "$fp_cv_prog_ar_args"; then
    AC_MSG_ERROR([cannot figure out how to use your $fp_prog_ar_raw])
  fi
fi])
fp_prog_ar_args=$fp_cv_prog_ar_args
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AC_SUBST([ArCmd], ["$fp_prog_ar"])
AC_SUBST([ArArgs], ["$fp_prog_ar_args"])
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])# FP_PROG_AR_ARGS


# FP_PROG_AR_NEEDS_RANLIB
# -----------------------
# Sets the output variable RANLIB to "ranlib" if it is needed and found,
# to ":" otherwise.
AC_DEFUN([FP_PROG_AR_NEEDS_RANLIB],
[AC_REQUIRE([FP_PROG_AR_IS_GNU])
AC_REQUIRE([FP_PROG_AR_ARGS])
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AC_REQUIRE([AC_PROG_CC])
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AC_CACHE_CHECK([whether ranlib is needed], [fp_cv_prog_ar_needs_ranlib],
[if test $fp_prog_ar_is_gnu = yes; then
  fp_cv_prog_ar_needs_ranlib=no
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elif echo $TargetPlatform | grep "^.*-apple-darwin$"  > /dev/null 2> /dev/null; then
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  # It's quite tedious to check for Apple's crazy timestamps in .a files,
  # so we hardcode it.
  fp_cv_prog_ar_needs_ranlib=yes
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elif echo $fp_prog_ar_args | grep "s" > /dev/null 2> /dev/null; then
  fp_cv_prog_ar_needs_ranlib=no
else
  fp_cv_prog_ar_needs_ranlib=yes
fi])
if test $fp_cv_prog_ar_needs_ranlib = yes; then
   AC_PROG_RANLIB
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else
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  RANLIB=":"
  AC_SUBST([RANLIB])
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fi
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])# FP_PROG_AR_NEEDS_RANLIB


# FP_PROG_AR_SUPPORTS_INPUT
# -------------------------
# Sets the output variable ArSupportsInput to "-input" or "", depending on
# whether ar supports -input flag is supported or not.
AC_DEFUN([FP_PROG_AR_SUPPORTS_INPUT],
[AC_REQUIRE([FP_PROG_AR_IS_GNU])
AC_REQUIRE([FP_PROG_AR_ARGS])
AC_CACHE_CHECK([whether $fp_prog_ar_raw supports -input], [fp_cv_prog_ar_supports_input],
[fp_cv_prog_ar_supports_input=no
if test $fp_prog_ar_is_gnu = no; then
  rm -f conftest*
  touch conftest.lst
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  if FP_EVAL_STDERR(["$fp_prog_ar_raw" $fp_prog_ar_args conftest.a -input conftest.lst]) >/dev/null; then
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    test -s conftest.err || fp_cv_prog_ar_supports_input=yes
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  fi
  rm -f conftest*
fi])
if test $fp_cv_prog_ar_supports_input = yes; then
    ArSupportsInput="-input"
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else
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    ArSupportsInput=""
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fi
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AC_SUBST([ArSupportsInput])
])# FP_PROG_AR_SUPPORTS_INPUT

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dnl
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dnl AC_SHEBANG_PERL - can we she-bang perl?
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dnl
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AC_DEFUN([FPTOOLS_SHEBANG_PERL],
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[AC_CACHE_CHECK([if your perl works in shell scripts], fptools_cv_shebang_perl,
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[echo "#!$PerlCmd"'
exit $1;
' > conftest
chmod u+x conftest
(SHELL=/bin/sh; export SHELL; ./conftest 69 > /dev/null)
if test $? -ne 69; then
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   fptools_cv_shebang_perl=yes
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else
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   fptools_cv_shebang_perl=no
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fi
rm -f conftest
])])

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# FP_HAVE_GCC
# -----------
# Extra testing of the result AC_PROG_CC, testing the gcc version no. Sets the
# output variables HaveGcc and GccVersion.
AC_DEFUN([FP_HAVE_GCC],
[AC_REQUIRE([AC_PROG_CC])
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if test -z "$GCC"; then
   fp_have_gcc=NO
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else
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   fp_have_gcc=YES
fi
if test "$fp_have_gcc" = "NO" -a -d $srcdir/ghc; then
  AC_MSG_ERROR([gcc is required])
fi
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GccLT34=
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AC_CACHE_CHECK([version of gcc], [fp_cv_gcc_version],
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[if test "$fp_have_gcc" = "YES"; then
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   fp_cv_gcc_version="`$CC -v 2>&1 | grep 'version ' | sed -e 's/.*version [[^0-9]]*\([[0-9.]]*\).*/\1/g'`"
   FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-lt], [3.0],
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     [AC_MSG_ERROR([Need at least gcc version 3.0 (3.4+ recommended)])])
   # See #2770: gcc 2.95 doesn't work any more, apparently.  There probably
   # isn't a very good reason for that, but for now just make configure
   # fail.
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   FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-lt], [3.4], GccLT34=YES)
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 else
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   fp_cv_gcc_version="not-installed"
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 fi
])
AC_SUBST([HaveGcc], [$fp_have_gcc])
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AC_SUBST([GccVersion], [$fp_cv_gcc_version])
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AC_SUBST(GccLT34)
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])# FP_HAVE_GCC
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dnl Small feature test for perl version. Assumes PerlCmd
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dnl contains path to perl binary.
dnl
dnl (Perl versions prior to v5.6 does not contain the string "v5";
dnl instead they display version strings such as "version 5.005".)
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dnl
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AC_DEFUN([FPTOOLS_CHECK_PERL_VERSION],
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[$PerlCmd -v >conftest.out 2>&1
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   if grep "v5" conftest.out >/dev/null 2>&1; then
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      :
   else
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      AC_MSG_ERROR([your version of perl probably won't work, try upgrading it.])
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   fi
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rm -fr conftest*
])
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# FP_CHECK_PROG(VARIABLE, PROG-TO-CHECK-FOR,
#               [VALUE-IF-NOT-FOUND], [PATH], [REJECT])
# -----------------------------------------------------
# HACK: A small wrapper around AC_CHECK_PROG, setting VARIABLE to the full path
# of PROG-TO-CHECK-FOR when found.
AC_DEFUN([FP_CHECK_PROG],
[AC_CHECK_PROG([$1], [$2], [$as_dir/$ac_word$ac_exec_ext], [$3], [$4], [$5])][]dnl
)# FP_CHECK_PROC


# FP_PROG_FIND
# ------------
# Find a non-WinDoze version of the "find" utility.
AC_DEFUN([FP_PROG_FIND],
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[AC_PATH_PROGS([fp_prog_find], [gfind find], find)
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echo foo > conftest.txt
$fp_prog_find conftest.txt -print > conftest.out 2>&1
if grep '^conftest.txt$' conftest.out > /dev/null 2>&1 ; then
  # OK, looks like a real "find".
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  case $HostPlatform in
    *mingw32)
      if test x${OSTYPE} != xmsys
      then
 	    fp_prog_find="`cygpath --mixed ${fp_prog_find}`"
        AC_MSG_NOTICE([normalized find command to $fp_prog_find])
      fi ;;
    *) ;;
  esac
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  FindCmd="$fp_prog_find"
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else
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  # Found a poor WinDoze version of "find", ignore it.
  AC_MSG_WARN([$fp_prog_find looks like a non-*nix find, ignoring it])
  FP_CHECK_PROG([FindCmd], [find], [], [], [$fp_prog_find])
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fi
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rm -f conftest.txt conftest.out
AC_SUBST([FindCmd])[]dnl
])# FP_PROG_FIND

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# FP_PROG_SORT
# ------------
# Find a Unix-like sort
AC_DEFUN([FP_PROG_SORT],
[AC_PATH_PROG([fp_prog_sort], [sort])
echo conwip > conftest.txt
$fp_prog_sort -f conftest.txt > conftest.out 2>&1
if grep 'conwip' conftest.out > /dev/null 2>&1 ; then
  # The goods
  SortCmd="$fp_prog_sort"
else
  # Summink else..pick next one.
  AC_MSG_WARN([$fp_prog_sort looks like a non-*nix sort, ignoring it])
  FP_CHECK_PROG([SortCmd], [sort], [], [], [$fp_prog_sort])
fi
rm -f conftest.txt conftest.out
AC_SUBST([SortCmd])[]dnl
])# FP_PROG_SORT

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dnl
dnl FPTOOLS_NOCACHE_CHECK prints a message, then sets the
dnl values of the second argument to the result of running
dnl the commands given by the third. It does not cache its
dnl result, so it is suitable for checks which should be
dnl run every time.
dnl
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AC_DEFUN([FPTOOLS_NOCACHE_CHECK],
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[AC_MSG_CHECKING([$1])
 $3
 AC_MSG_RESULT([$][$2])
])

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dnl
dnl FPTOOLS_GHC_VERSION(version)
dnl FPTOOLS_GHC_VERSION(major, minor [, patchlevel])
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dnl FPTOOLS_GHC_VERSION(version, major, minor, patchlevel)
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dnl
dnl Test for version of installed ghc.  Uses $GHC.
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dnl [original version pinched from c2hs]
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AC_DEFUN([FPTOOLS_GHC_VERSION],
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[FPTOOLS_NOCACHE_CHECK([version of ghc], [fptools_version_of_ghc],
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["${WithGhc-ghc}" --version > conftestghc 2>&1
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  cat conftestghc >&AS_MESSAGE_LOG_FD
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#Useless Use Of cat award...
  fptools_version_of_ghc=`cat conftestghc | sed -n -e 's/, patchlevel *\([[0-9]]\)/.\1/;s/.* version \([[0-9]][[0-9.]]*\).*/\1/p'`
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  rm -fr conftest*
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  if test "[$]fptools_version_of_ghc" = ""
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  then
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    fptools_version_of_ghc='unknown'
  fi
fptools_version_of_ghc[_major]=`echo [$]fptools_version_of_ghc | sed -e 's/^\([[0-9]]\).*/\1/'`
fptools_version_of_ghc[_minor]=`echo [$]fptools_version_of_ghc | sed -e 's/^[[0-9]]\.\([[0-9]]*\).*/\1/'`
fptools_version_of_ghc[_pl]=`echo [$]fptools_version_of_ghc | sed -n -e 's/^[[0-9]]\.[[0-9]]*\.\([[0-9]]*\)/\1/p'`
#
if test "[$]fptools_version_of_ghc[_pl]" = ""
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then
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  fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor]"
  fptools_version_of_ghc[_pl]="0"
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fi
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#
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ifelse($#, [1], [dnl
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[$1]="[$]fptools_version_of_ghc[_all]"
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], $#, [2], [dnl
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[$1]="[$]fptools_version_of_ghc[_major]"
[$2]="[$]fptools_version_of_ghc[_minor]"
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], $#, [3], [dnl
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[$1]="[$]fptools_version_of_ghc[_major]"
[$2]="[$]fptools_version_of_ghc[_minor]"
[$3]="[$]fptools_version_of_ghc[_pl]"
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[$1]="[$]fptools_version_of_ghc[_all]"
[$2]="[$]fptools_version_of_ghc[_major]"
[$3]="[$]fptools_version_of_ghc[_minor]"
[$4]="[$]fptools_version_of_ghc[_pl]"
])
])
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])dnl
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# FP_CHECK_FUNC(FUNCTION, PROLOGUE, BODY, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# ---------------------------------------------------------------------------------
# A variant of AC_CHECK_FUNCS, limited to a single FUNCTION, but with the
# additional flexibility of specifying the PROLOGUE and BODY.
AC_DEFUN([FP_CHECK_FUNC],
[AS_VAR_PUSHDEF([fp_func], [fp_cv_func_$1])dnl
AC_CACHE_CHECK([for $1], fp_func,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([$2], [$3])],
                [AS_VAR_SET(fp_func, yes)],
                [AS_VAR_SET(fp_func, no)])])
AS_IF([test AS_VAR_GET(fp_func) = yes],
      [AC_DEFINE(AS_TR_CPP(HAVE_$1), [1],
                [Define to 1 if you have the `]$1[' function.]) $4],
      [$5])dnl
AS_VAR_POPDEF([fp_func])dnl
])# FP_CHECK_FUNC


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# FP_GEN_DOCBOOK_XML
# ------------------
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# Generates a DocBook XML V4.5 document in conftest.xml.
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#
# It took a lot of experimentation to find a document that will cause
# xsltproc to fail with an error code when the relevant
# stylesheets/DTDs are not found.  I couldn't make xsltproc fail with
# a single-file document, it seems a multi-file document is needed.
# -- SDM 2009-06-03
#
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AC_DEFUN([FP_GEN_DOCBOOK_XML],
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cat > conftest.xml << EOF
<?xml version="1.0" encoding="iso-8859-1"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [[
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<!ENTITY conftest-book SYSTEM "conftest-book.xml">
]]>
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<book id="test">
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&conftest-book;
</book>
EOF
cat >conftest-book.xml << EOF
<?xml version="1.0" encoding="iso-8859-1"?>
  <title>A DocBook &ldquo;Test Document&rdquo;</title>
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  <chapter id="id-one">
    <title>A Chapter Title</title>
    <para>This is a paragraph, referencing <xref linkend="id-two"/>.</para>
  </chapter>
  <chapter id="id-two">
    <title>Another Chapter Title</title>
    <para>This is another paragraph, referencing <xref linkend="id-one"/>.</para>
  </chapter>
EOF
]) # FP_GEN_DOCBOOK_XML


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# FP_PROG_DBLATEX
# ----------------
# Sets the output variable DblatexCmd to the full path of dblatex,
# which we use for building PDF and PS docs.
# DblatexCmd is empty if dblatex could not be found.
AC_DEFUN([FP_PROG_DBLATEX],
[AC_PATH_PROG([DblatexCmd], [dblatex])
if test -z "$DblatexCmd"; then
  AC_MSG_WARN([cannot find dblatex in your PATH, you will not be able to build the PDF and PS documentation])
fi
])# FP_PROG_DBLATEX


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# FP_PROG_XSLTPROC
# ----------------
# Sets the output variable XsltprocCmd to the full path of the XSLT processor
# xsltproc. XsltprocCmd is empty if xsltproc could not be found.
AC_DEFUN([FP_PROG_XSLTPROC],
[AC_PATH_PROG([XsltprocCmd], [xsltproc])
if test -z "$XsltprocCmd"; then
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# FP_DOCBOOK_XSL
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# ----------------------------
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# Check that we can process a DocBook XML document to HTML using xsltproc.
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if test -n "$XsltprocCmd"; then
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  AC_CACHE_CHECK([for DocBook XSL stylesheet], fp_cv_dir_docbook_xsl,
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  [FP_GEN_DOCBOOK_XML
  fp_cv_dir_docbook_xsl=no
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  if $XsltprocCmd --nonet http://docbook.sourceforge.net/release/xsl/current/html/chunk.xsl conftest.xml > /dev/null 2>&1; then
     fp_cv_dir_docbook_xsl=yes
  fi
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  rm -rf conftest*])
fi
if test x"$fp_cv_dir_docbook_xsl" = xno; then
  AC_MSG_WARN([cannot find DocBook XSL stylesheets, you will not be able to build the documentation])
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  HAVE_DOCBOOK_XSL=NO
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else
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  HAVE_DOCBOOK_XSL=YES
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fi
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AC_SUBST([HAVE_DOCBOOK_XSL])
])# FP_DOCBOOK_XSL
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# FP_PROG_XMLLINT
# ----------------
# Sets the output variable XmllintCmd to the full path of the XSLT processor
# xmllint. XmllintCmd is empty if xmllint could not be found.
AC_DEFUN([FP_PROG_XMLLINT],
[AC_PATH_PROG([XmllintCmd], [xmllint])
if test -z "$XmllintCmd"; then
  AC_MSG_WARN([cannot find xmllint in your PATH, you will not be able to validate your documentation])
fi
])# FP_PROG_XMLLINT


# FP_CHECK_DOCBOOK_DTD
# --------------------
AC_DEFUN([FP_CHECK_DOCBOOK_DTD],
[AC_REQUIRE([FP_PROG_XMLLINT])dnl
if test -n "$XmllintCmd"; then
  AC_MSG_CHECKING([for DocBook DTD])
  FP_GEN_DOCBOOK_XML
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  if $XmllintCmd --nonet --valid --noout conftest.xml ; then
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    AC_MSG_RESULT([ok])
  else
    AC_MSG_RESULT([failed])
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    AC_MSG_WARN([cannot find a DTD for DocBook XML V4.5, you will not be able to validate your documentation])
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    AC_MSG_WARN([check your XML_CATALOG_FILES environment variable and/or /etc/xml/catalog])
  fi
  rm -rf conftest*
fi
])# FP_CHECK_DOCBOOK_DTD


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# FP_GEN_FO
# ------------------
# Generates a formatting objects document in conftest.fo.
AC_DEFUN([FP_GEN_FO],
[rm -f conftest.fo
cat > conftest.fo << EOF
<?xml version="1.0"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="blank">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="blank">
    <fo:flow flow-name="xsl-region-body">
      <fo:block>
        Test!
      </fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>
EOF
]) # FP_GEN_FO


# FP_PROG_FOP
# -----------
# Set the output variable 'FopCmd' to the first working 'fop' in the current
# 'PATH'. Note that /usr/bin/fop is broken in SuSE 9.1 (unpatched), so try
# /usr/share/fop/fop.sh in that case (or no 'fop'), too.
AC_DEFUN([FP_PROG_FOP],
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[AC_PATH_PROGS([FopCmd1], [fop fop.sh])
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if test -n "$FopCmd1"; then
  AC_CACHE_CHECK([for $FopCmd1 usability], [fp_cv_fop_usability],
    [FP_GEN_FO
    if "$FopCmd1" -fo conftest.fo -ps conftest.ps > /dev/null 2>&1; then
      fp_cv_fop_usability=yes
    else
      fp_cv_fop_usability=no
    fi
    rm -rf conftest*])
  if test x"$fp_cv_fop_usability" = xyes; then
     FopCmd=$FopCmd1
  fi
fi
if test -z "$FopCmd"; then
  AC_PATH_PROGS([FopCmd2], [fop.sh], , [/usr/share/fop])
  FopCmd=$FopCmd2
fi
AC_SUBST([FopCmd])
])# FP_PROG_FOP


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# FP_PROG_HSTAGS
# ----------------
# Sets the output variable HstagsCmd to the full Haskell tags program path.
# HstagsCmd is empty if no such program could be found.
AC_DEFUN([FP_PROG_HSTAGS],
[AC_PATH_PROG([HstagsCmd], [hasktags])
if test -z "$HstagsCmd"; then
  AC_MSG_WARN([cannot find hasktags in your PATH, you will not be able to build the tags])
fi
])# FP_PROG_HSTAGS


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# FP_PROG_GHC_PKG
# ----------------
# Try to find a ghc-pkg matching the ghc mentioned in the environment variable
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# WithGhc. Sets the output variable GhcPkgCmd.
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AC_DEFUN([FP_PROG_GHC_PKG],
[AC_CACHE_CHECK([for ghc-pkg matching $WithGhc], fp_cv_matching_ghc_pkg,
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[
# If we are told to use ghc-stage2, then we're using an in-tree
# compiler. In this case, we just want ghc-pkg, not ghc-pkg-stage2,
# so we sed off -stage[0-9]$. However, if we are told to use
# ghc-6.12.1 then we want to use ghc-pkg-6.12.1, so we keep any
# other suffix.
fp_ghc_pkg_guess=`echo $WithGhc | sed -e 's/-stage@<:@0-9@:>@$//' -e 's,ghc\(@<:@^/\\@:>@*\)$,ghc-pkg\1,'`
if "$fp_ghc_pkg_guess" list > /dev/null 2>&1; then
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  fp_cv_matching_ghc_pkg=$fp_ghc_pkg_guess
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else
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  AC_MSG_ERROR([Cannot find matching ghc-pkg])
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fi])
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GhcPkgCmd=$fp_cv_matching_ghc_pkg
AC_SUBST([GhcPkgCmd])
])# FP_PROG_GHC_PKG
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# FP_GCC_EXTRA_FLAGS
# ------------------
# Determine which extra flags we need to pass gcc when we invoke it
# to compile .hc code.
#
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# Some OSs (Mandrake Linux, in particular) configure GCC with
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# -momit-leaf-frame-pointer on by default. If this is the case, we
# need to turn it off for mangling to work. The test is currently a
# bit crude, using only the version number of gcc.
# 
# -fwrapv is needed for gcc to emit well-behaved code in the presence of
# integer wrap around. (Trac #952)
#
# -fno-unit-at-a-time or -fno-toplevel-reoder is necessary to avoid gcc
# reordering things in the module and confusing the manger and/or splitter.
# (eg. Trac #1427)
#
AC_DEFUN([FP_GCC_EXTRA_FLAGS],
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[AC_REQUIRE([FP_HAVE_GCC])
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AC_CACHE_CHECK([for extra options to pass gcc when compiling via C], [fp_cv_gcc_extra_opts],
[fp_cv_gcc_extra_opts=
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  [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fwrapv"],
  [])
 case $TargetPlatform in
  i386-*|x86_64-*) 
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     FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [3.2],
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      [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -mno-omit-leaf-frame-pointer"],
      [])
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    FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [3.4],
     [FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [4.2],
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       [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fno-toplevel-reorder"],
       [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fno-unit-at-a-time"]
     )],
     [])
  ;;
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  sparc-*-solaris2) 
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    FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [4.2],
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      [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fno-toplevel-reorder"],
      [])
  ;;
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 esac
])
AC_SUBST([GccExtraViaCOpts],$fp_cv_gcc_extra_opts)
])
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# FP_SETUP_PROJECT_VERSION
# ---------------------
AC_DEFUN([FP_SETUP_PROJECT_VERSION],
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[
if test "$RELEASE" = "NO"; then
    AC_MSG_CHECKING([for GHC version date])
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    if test -f VERSION_DATE; then
        PACKAGE_VERSION=${PACKAGE_VERSION}.`cat VERSION_DATE`
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        AC_MSG_RESULT(given $PACKAGE_VERSION)
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    elif test -d .git; then
        changequote(, )dnl
        ver_date=`git log -n 1 --date=short --pretty=format:%ci | sed "s/^.*\([0-9][0-9][0-9][0-9]\)-\([0-9][0-9]\)-\([0-9][0-9]\).*$/\1\2\3/"`
        if echo $ver_date | grep '^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$' 2>&1 >/dev/null; then true; else
        changequote([, ])dnl
                AC_MSG_ERROR([failed to detect version date: check that git is in your path])
        fi
        PACKAGE_VERSION=${PACKAGE_VERSION}.$ver_date
        AC_MSG_RESULT(inferred $PACKAGE_VERSION)
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    elif test -d _darcs; then
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        # TODO: Remove this branch after conversion to Git
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        changequote(, )dnl
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        ver_date=`darcs changes --quiet --no-summary --xml | head -500 | grep 'date=' | sed "s/^.*date='\([0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]\).*$/\1/g" | ${SortCmd} -n | tail -1`
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        if echo $ver_date | grep '^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$' 2>&1 >/dev/null; then true; else
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        changequote([, ])dnl
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                AC_MSG_ERROR([failed to detect version date: check that darcs is in your path])
        fi
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        PACKAGE_VERSION=${PACKAGE_VERSION}.$ver_date
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        AC_MSG_RESULT(inferred $PACKAGE_VERSION)
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    elif test -f VERSION; then
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        PACKAGE_VERSION=`cat VERSION`
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        AC_MSG_RESULT(given $PACKAGE_VERSION)
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    else
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        AC_MSG_WARN([cannot determine snapshot version: no .git or _darcs directory and no VERSION file])
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    fi
fi

# Some renamings
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AC_SUBST([ProjectName], [$PACKAGE_NAME])
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AC_SUBST([ProjectVersion], [$PACKAGE_VERSION])

# Split PACKAGE_VERSION into (possibly empty) parts
VERSION_MAJOR=`echo $PACKAGE_VERSION | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\1'/`
VERSION_TMP=`echo $PACKAGE_VERSION | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\3'/`
VERSION_MINOR=`echo $VERSION_TMP | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\1'/`
ProjectPatchLevel=`echo $VERSION_TMP | sed 's/^\(@<:@^.@:>@*\)\(\.\{0,1\}\(.*\)\)$/\3'/`

# Calculate project version as an integer, using 2 digits for minor version
case $VERSION_MINOR in
  ?) ProjectVersionInt=${VERSION_MAJOR}0${VERSION_MINOR} ;;
  ??) ProjectVersionInt=${VERSION_MAJOR}${VERSION_MINOR} ;;
  *) AC_MSG_ERROR([bad minor version in $PACKAGE_VERSION]) ;;
esac
AC_SUBST([ProjectVersionInt])

# The project patchlevel is zero unless stated otherwise
test -z "$ProjectPatchLevel" && ProjectPatchLevel=0

# Remove dots from the patch level; this allows us to have versions like 6.4.1.20050508
ProjectPatchLevel=`echo $ProjectPatchLevel | sed 's/\.//'`

AC_SUBST([ProjectPatchLevel])
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])# FP_SETUP_PROJECT_VERSION
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# Check for a working timer_create().  We need a pretty detailed check
# here, because there exist partially-working implementations of
# timer_create() in certain versions of Linux (see bug #1933).
#
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AC_DEFUN([FP_CHECK_TIMER_CREATE],
  [AC_CACHE_CHECK([for a working timer_create(CLOCK_REALTIME)], 
    [fptools_cv_timer_create_works],
    [AC_TRY_RUN([
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#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
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#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
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static volatile int tock = 0;
static void handler(int i)
{
   tock = 1;
}

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static void timeout(int i)
{
  // timer_settime() has been known to hang, so just in case
  // we install a 1-second timeout (see #2257)
  exit(99);
}

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int main(int argc, char *argv[])
{
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    struct sigevent ev;
    timer_t timer;
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    struct itimerspec it;
    struct sigaction action;
    int m,n,count = 0;

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    ev.sigev_notify = SIGEV_SIGNAL;
    ev.sigev_signo  = SIGVTALRM;
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    action.sa_handler = handler;
    action.sa_flags = 0;
    sigemptyset(&action.sa_mask);
    if (sigaction(SIGVTALRM, &action, NULL) == -1) {
        fprintf(stderr,"SIGVTALRM problem\n");
        exit(3);
    }

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    action.sa_handler = timeout;
    action.sa_flags = 0;
    sigemptyset(&action.sa_mask);
    if (sigaction(SIGALRM, &action, NULL) == -1) {
      fprintf(stderr,"SIGALRM problem\n");
      exit(3);
    }
    alarm(1);

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    if (timer_create(CLOCK_PROCESS_CPUTIME_ID, &ev, &timer) != 0) {
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        fprintf(stderr,"No CLOCK_PROCESS_CPUTIME_ID timer\n");
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       exit(1);
    }
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    it.it_value.tv_sec = 0;
    it.it_value.tv_nsec = 1;
    it.it_interval = it.it_value;
    if (timer_settime(timer, 0, &it, NULL) != 0) {
        fprintf(stderr,"settime problem\n");
        exit(4);
    }

    tock = 0;

    for(n = 3; n < 20000; n++){
        for(m = 2; m <= n/2; m++){
            if (!(n%m)) count++;
            if (tock) goto out;
        }
    }
out:

    if (!tock) {
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        fprintf(stderr,"no CLOCK_PROCESS_CPUTIME_ID signal\n");
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        exit(5);
    }

    timer_delete(timer);

    if (timer_create(CLOCK_REALTIME, &ev, &timer) != 0) {
        fprintf(stderr,"No CLOCK_REALTIME timer\n");
        exit(2);
    }

    it.it_value.tv_sec = 0;
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    it.it_interval = it.it_value;
    if (timer_settime(timer, 0, &it, NULL) != 0) {
        fprintf(stderr,"settime problem\n");
        exit(4);
    }

    tock = 0;

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    usleep(3000);
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    if (!tock) {
        fprintf(stderr,"no CLOCK_REALTIME signal\n");
        exit(5);
    }

    timer_delete(timer);

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    exit(0);
}
     ],
     [fptools_cv_timer_create_works=yes],
     [fptools_cv_timer_create_works=no])
  ])
case $fptools_cv_timer_create_works in
    yes) AC_DEFINE([USE_TIMER_CREATE], 1, 
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                   [Define to 1 if we can use timer_create(CLOCK_PROCESS_CPUTIME_ID,...)]);;
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esac
])

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# FP_ICONV
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# -------------
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AC_DEFUN([FP_ICONV],
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[
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  dnl--------------------------------------------------------------------
  dnl * Deal with arguments telling us iconv is somewhere odd
  dnl--------------------------------------------------------------------

  dnl Note: ICONV_LIB_DIRS and ICONV_INCLUDE_DIRS are not predefined
  dnl to the empty string to allow them to be overridden from the
  dnl environment.

  AC_ARG_WITH([iconv-includes],
    [AC_HELP_STRING([--with-iconv-includes],
      [directory containing iconv.h])],
      [ICONV_INCLUDE_DIRS=$withval])

  AC_ARG_WITH([iconv-libraries],
    [AC_HELP_STRING([--with-iconv-libraries],
      [directory containing iconv library])],
      [ICONV_LIB_DIRS=$withval])

  AC_SUBST(ICONV_INCLUDE_DIRS)
  AC_SUBST(ICONV_LIB_DIRS)
])# FP_ICONV

# FP_GMP
# -------------
AC_DEFUN([FP_GMP],
[
  dnl--------------------------------------------------------------------
  dnl * Deal with arguments telling us gmp is somewhere odd
  dnl--------------------------------------------------------------------

  AC_ARG_WITH([gmp-includes],
    [AC_HELP_STRING([--with-gmp-includes],
      [directory containing gmp.h])],
      [GMP_INCLUDE_DIRS=$withval])

  AC_ARG_WITH([gmp-libraries],
    [AC_HELP_STRING([--with-gmp-libraries],
      [directory containing gmp library])],
      [GMP_LIB_DIRS=$withval])

  AC_SUBST(GMP_INCLUDE_DIRS)
  AC_SUBST(GMP_LIB_DIRS)
])# FP_GMP
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# FP_CHECK_MACOSX_DEPLOYMENT_TARGET
# ---------------------------------
AC_DEFUN([FP_CHECK_MACOSX_DEPLOYMENT_TARGET],
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[
if test "x$TargetOS_CPP-$TargetVendor_CPP" = "xdarwin-apple"; then
  AC_MSG_CHECKING([Mac OS X deployment target])
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  case $FP_MACOSX_DEPLOYMENT_TARGET in
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    none)  ;;
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    10.4)  MACOSX_DEPLOYMENT_VERSION=10.4
    	   MACOSX_DEPLOYMENT_SDK=/Developer/SDKs/MacOSX10.4u.sdk
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	   ;;
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    10.4u) MACOSX_DEPLOYMENT_VERSION=10.4
    	   MACOSX_DEPLOYMENT_SDK=/Developer/SDKs/MacOSX10.4u.sdk
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	   ;;
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    *)     MACOSX_DEPLOYMENT_VERSION=$FP_MACOSX_DEPLOYMENT_TARGET
    	   MACOSX_DEPLOYMENT_SDK=/Developer/SDKs/MacOSX${FP_MACOSX_DEPLOYMENT_TARGET}.sdk
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	   ;;
  esac
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  if test "x$FP_MACOSX_DEPLOYMENT_TARGET" = "xnone"; then
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    AC_MSG_RESULT(none)
  else
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    if test ! -d $MACOSX_DEPLOYMENT_SDK; then
      AC_MSG_ERROR([Unknown deployment target $FP_MACOSX_DEPLOYMENT_TARGET])
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    AC_MSG_RESULT([${MACOSX_DEPLOYMENT_VERSION} (${MACOSX_DEPLOYMENT_SDK})])
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  fi
fi
])

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# --------------------------------------------------------------
# Calculate absolute path to build tree
# --------------------------------------------------------------

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AC_DEFUN([FP_INTREE_GHC_PWD],[
AC_MSG_NOTICE(Building in-tree ghc-pwd)
    dnl This would be
    dnl     make -C utils/ghc-pwd clean && make -C utils/ghc-pwd
    dnl except we don't want to have to know what make is called. Sigh.
    rm -rf utils/ghc-pwd/dist-boot
    mkdir  utils/ghc-pwd/dist-boot
    if ! "$WithGhc" -v0 -no-user-package-conf -hidir utils/ghc-pwd/dist-boot -odir utils/ghc-pwd/dist-boot -stubdir utils/ghc-pwd/dist-boot --make utils/ghc-pwd/Main.hs -o utils/ghc-pwd/dist-boot/ghc-pwd
    then
        AC_MSG_ERROR([Building ghc-pwd failed])
    fi
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    GHC_PWD=utils/ghc-pwd/dist-boot/ghc-pwd
])
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AC_DEFUN([FP_BINDIST_GHC_PWD],[
    GHC_PWD=utils/ghc-pwd/dist/build/tmp/ghc-pwd
])
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AC_DEFUN([FP_FIND_ROOT],[
AC_MSG_CHECKING(for path to top of build tree)
    hardtop=`$GHC_PWD`
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    dnl Remove common automounter nonsense
    hardtop=`echo $hardtop | sed 's|^/tmp_mnt.*\(/local/.*\)$|\1|' | sed 's|^/tmp_mnt/|/|'`
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    if ! test -d "$hardtop"; then
        AC_MSG_ERROR([cannot determine current directory])
    fi
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    dnl We don't support building in directories with spaces.
    case "$hardtop" in
    *' '*)
        AC_MSG_ERROR([
        The build system does not support building in a directory
        containing space characters.
        Suggestion: move the build tree somewhere else.])
        ;;
    esac
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    AC_SUBST(hardtop)

    AC_MSG_RESULT($hardtop)
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])

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# GHC_CONVERT_CPU(cpu, target_var)
# --------------------------------
# converts cpu from gnu to ghc naming, and assigns the result to $target_var
AC_DEFUN([GHC_CONVERT_CPU],[
case "$1" in
  alpha*)
    $2="alpha"
    ;;
  arm*)
    $2="arm"
    ;;
  hppa1.1*)
    $2="hppa1_1"
    ;;
  hppa*)
    $2="hppa"
    ;;
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  i386|i486|i586|i686)
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    $2="i386"
    ;;
  ia64)
    $2="ia64"
    ;;
  m68k*)
    $2="m68k"
    ;;
  mipseb*)
    $2="mipseb"
    ;;
  mipsel*)
    $2="mipsel"
    ;;
  mips*)
    $2="mips"
    ;;
  powerpc64*)
    $2="powerpc64"
    ;;
  powerpc*)
    $2="powerpc"
    ;;
  rs6000)
    $2="rs6000"
    ;;
  s390*)
    $2="s390"
    ;;
  sparc64*)
    $2="sparc64"
    ;;
  sparc*)
    $2="sparc"
    ;;
  vax)
    $2="vax"
    ;;
  x86_64)
    $2="x86_64"
    ;;
  *)
    echo "Unknown CPU $1"
    exit 1
    ;;
  esac
])

# GHC_CONVERT_VENDOR(vendor, target_var)
# --------------------------------
# converts vendor from gnu to ghc naming, and assigns the result to $target_var
AC_DEFUN([GHC_CONVERT_VENDOR],[
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  case "$1" in
  pc|gentoo) # like i686-pc-linux-gnu and i686-gentoo-freebsd8
    $2="unknown"
    ;;
  *)
    #pass thru by default
    $2="$1"
    ;;
  esac
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])

# GHC_CONVERT_OS(os, target_var)
# --------------------------------
# converts os from gnu to ghc naming, and assigns the result to $target_var
AC_DEFUN([GHC_CONVERT_OS],[
case "$1" in
  linux-*|linux)
    $2="linux"
    ;;
  # As far as I'm aware, none of these have relevant variants
  freebsd|netbsd|openbsd|dragonfly|osf1|osf3|hpux|linuxaout|kfreebsdgnu|freebsd2|solaris2|cygwin32|mingw32|darwin|gnu|nextstep2|nextstep3|sunos4|ultrix|irix|aix|haiku)
    $2="$1"
    ;;
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  freebsd8) # like i686-gentoo-freebsd8
    $2="freebsd"
    ;;
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  *)
    echo "Unknown OS $1"
    exit 1
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