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dnl == autoconf source for the Glasgow FP tools ==
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dnl (run "grep '^dnl \*' configure.ac | sed -e 's/dnl / /g; s/\*\*/   +/g;'"
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dnl  (or some such) to see the outline of this file)
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dnl
#
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# (c) The University of Glasgow 1994-2004
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#
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# Configure script template for GHC
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#
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# Process with 'autoreconf' to get a working configure script.
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#
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# For the generated configure script, do "./configure --help" to
# see what flags are available. (Better yet, read the documentation!)
#

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AC_INIT([The Glorious Glasgow Haskell Compilation System], [7.1], [glasgow-haskell-bugs@haskell.org], [ghc])
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# Set this to YES for a released version, otherwise NO
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: ${RELEASE=NO}
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# The primary version (e.g. 6.7, 6.6.1) is set in the AC_INIT line
# above.  If this is not a released version, then we will append the
# date to the version number (e.g. 6.7.20070204).  The date is
# constructed by finding the date of the most recent patch in the
# darcs repository.  If this is a source distribution (not a darcs
# checkout), then we ship a file 'VERSION' containing the full version
# when the source distribution was created.

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if test ! -f mk/config.h.in; then
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   echo "mk/config.h.in doesn't exist: perhaps you haven't run 'perl boot'?"
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   exit 1
fi

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AC_SUBST([CONFIGURE_ARGS], [$ac_configure_args])

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dnl ----------------------------------------------------------
dnl ** Find unixy sort and find commands, 
dnl ** which are needed by FP_SETUP_PROJECT_VERSION

dnl ** Find find command (for Win32's benefit)
FP_PROG_FIND

dnl ** Find sort command (for the benefit of Win32 environs)
FP_PROG_SORT

dnl ----------------------------------------------------------
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FP_SETUP_PROJECT_VERSION

# Hmmm, we fix the RPM release number to 1 here... Is this convenient?
AC_SUBST([release], [1])
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# First off, a distrib sanity check..
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AC_CONFIG_SRCDIR([mk/config.mk.in])
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dnl * We require autoconf version 2.52
dnl We need 2.50 due to the use of AC_SYS_LARGEFILE and AC_MSG_NOTICE.
dnl We need 2.52 due to the use of AS_TR_CPP and AS_TR_SH.
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AC_PREREQ([2.52])
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# -------------------------------------------------------------------------
# Prepare to generate the following header files
#
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#
AC_CONFIG_HEADER(mk/config.h)
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# No, semi-sadly, we don't do `--srcdir'...
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if test x"$srcdir" != 'x.' ; then
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    echo "This configuration does not support the \`--srcdir' option.."
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    exit 1
fi

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dnl --------------------------------------------------------------
dnl * Project specific configuration options
dnl --------------------------------------------------------------
dnl What follows is a bunch of options that can either be configured
dnl through command line options to the configure script or by
dnl supplying defns in the build tree's mk/build.mk. Having the option to
dnl use either is considered a Feature.

dnl ** What command to use to compile compiler sources ?
dnl --------------------------------------------------------------
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AC_ARG_WITH([ghc],
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[AC_HELP_STRING([--with-ghc=ARG],
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  [Use ARG as the path to GHC  [default=autodetect]])],
  [WithGhc="$withval"],
  [if test "$GHC" = ""; then
    AC_PATH_PROG([GHC], [ghc])
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  fi
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  WithGhc="$GHC"])
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dnl ** Tell the make system which OS we are using
dnl $OSTYPE is set by the operating system to "msys" or "cygwin" or something 
AC_SUBST(OSTYPE)

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dnl ** Booting from .hc files?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(hc-boot,
[AC_HELP_STRING([--enable-hc-boot],
[Boot the Glasgow Haskell Compiler from intermediate .hc files.
 (This option is mostly of interest to porters.) [default=no]])],
[ if test x"$enableval" = x"yes"; then
        BootingFromHc=YES
  else
        BootingFromHc=NO
  fi
],
[BootingFromHc=NO]
)
AC_SUBST(BootingFromHc)

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AC_ARG_ENABLE(bootstrap-with-devel-snapshot,
[AC_HELP_STRING([--enable-bootstrap-with-devel-snapshot],
                [Allow bootstrapping using a development snapshot of GHC.  This is not guaranteed to work.])],
        EnableBootstrapWithDevelSnaphost=YES,
        EnableBootstrapWithDevelSnaphost=NO
)

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if test "$WithGhc" != ""; then
  FPTOOLS_GHC_VERSION([GhcVersion], [GhcMajVersion], [GhcMinVersion], [GhcPatchLevel])dnl
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  if test "$GhcMajVersion" = "unknown" -o "$GhcMinVersion" = "unknown"; then
     AC_MSG_ERROR([Cannot determine the version of $WithGhc.  Is it really GHC?])
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  fi

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  AC_SUBST(GhcVersion)dnl
  AC_SUBST(GhcMajVersion)dnl
  AC_SUBST(GhcMinVersion)dnl
  AC_SUBST(GhcPatchLevel)dnl
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  GhcMinVersion2=`echo "$GhcMinVersion" | sed 's/^\\(.\\)$/0\\1/'`
  GhcCanonVersion="$GhcMajVersion$GhcMinVersion2"
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  if test $GhcCanonVersion -ge 613; then ghc_ge_613=YES; else ghc_ge_613=NO; fi
  AC_SUBST(ghc_ge_613)dnl
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fi

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dnl ** Must have GHC to build GHC, unless --enable-hc-boot is on
if test "$BootingFromHc" = "NO" -a -d "$srcdir/compiler"; then
  if test "$WithGhc" = ""; then
     AC_MSG_ERROR([GHC is required unless bootstrapping from .hc files.])
  fi
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  FP_COMPARE_VERSIONS([$GhcVersion],[-lt],[6.12],
    [AC_MSG_ERROR([GHC version 6.12 or later is required to compile GHC.])])dnl
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  if test `expr $GhcMinVersion % 2` = "1"; then
     if test "$EnableBootstrapWithDevelSnaphost" = "NO"; then
        AC_MSG_ERROR([
     $WithGhc is a development snapshot of GHC, version $GhcVersion.
     Bootstrapping using this version of GHC is not supported, and may not
     work.  Use --enable-bootstrap-with-devel-snapshot to try it anyway,
     or --with-ghc to specify a different GHC to use.])
     fi
  fi
fi;

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# GHC is passed to Cabal, so we need a native path
if test "${WithGhc}" != ""
then
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    ghc_host=`"${WithGhc}" +RTS --info | grep 'Host platform' | sed -e 's/.*, "//' -e 's/")//'`
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    if test "$ghc_host" = "i386-unknown-mingw32"
    then
        if test "${OSTYPE}" = "msys"
        then
            WithGhc=`echo "${WithGhc}" | sed "s#^/\([a-zA-Z]\)/#\1:/#"`
        else
            # Canonicalise to <drive>:/path/to/ghc
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            WithGhc=`cygpath -m "${WithGhc}"`
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        fi
        echo "GHC path canonicalised to: ${WithGhc}"
    fi
fi
AC_SUBST([WithGhc])

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dnl ** Without optimization some INLINE trickery fails for GHCi
SRC_CC_OPTS="-O"

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FP_ICONV
FP_GMP
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dnl--------------------------------------------------------------------
dnl * Choose host(/target/build) platform
dnl--------------------------------------------------------------------
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dnl If we aren't explicitly told what values to use with configure flags,
dnl we ask the bootstrapping compiler what platform it is for
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if test "${WithGhc}" != ""
then
        bootstrap_host=`"${WithGhc}" +RTS --info | grep '^ ,("Host platform"' | sed -e 's/.*, "//' -e 's/")//' | tr -d '\r'`
        bootstrap_target=`"${WithGhc}" +RTS --info | grep '^ ,("Target platform"' | sed -e 's/.*, "//' -e 's/")//' | tr -d '\r'`
        if test "$bootstrap_host" != "$bootstrap_target"
        then
                echo "Bootstrapping GHC is a cross compiler. This probably isn't going to work"
        fi
fi

# We have to run these unconditionally, but we may discard their
# results in the following code
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

# 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

if test "$build_alias" = ""
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then
    if test "${WithGhc}" != ""
    then
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        build=$bootstrap_target
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        echo "Build platform inferred as: $build"
    else
        echo "Can't work out build platform"
        exit 1
    fi
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    BuildArch=`echo "$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])
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fi

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if test "$host_alias" = ""
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then
    if test "${WithGhc}" != ""
    then
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        host=$bootstrap_target
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        echo "Host platform inferred as: $host"
    else
        echo "Can't work out host platform"
        exit 1
    fi
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    HostArch=`echo "$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])
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fi

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if test "$target_alias" = ""
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then
    if test "${WithGhc}" != ""
    then
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        target=$bootstrap_target
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        echo "Target platform inferred as: $target"
    else
        echo "Can't work out target platform"
        exit 1
    fi
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    TargetArch=`echo "$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])
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fi

exeext=''
soext='.so'
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case $host in
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*-unknown-cygwin32)
    AC_MSG_WARN([GHC does not support the Cygwin target at the moment])
    AC_MSG_WARN([I'm assuming you wanted to build for i386-unknown-mingw32])
    exit 1
    ;;
*-unknown-mingw32)
    exeext='.exe'
    soext='.dll'
    ;;
i386-apple-darwin|powerpc-apple-darwin)
    soext='.dylib'
    ;;
x86_64-apple-darwin)
    soext='.dylib'
    ;;
esac

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# Sync this with cTargetArch in compiler/ghc.mk
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checkArch() {
    case $1 in
    alpha|arm|hppa|hppa1_1|i386|ia64|m68k|mips|mipseb|mipsel|powerpc|powerpc64|rs6000|s390|sparc|sparc64|vax|x86_64)
        ;;
    *)
        echo "Unknown arch $1"
        exit 1
        ;;
    esac
}

checkVendor() {
    case $1 in
    dec|unknown|hp|apple|next|sun|sgi|ibm)
        ;;
    *)
        echo "Unknown vendor $1"
        exit 1
        ;;
    esac
}

checkOS() {
    case $1 in
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    linux|freebsd|netbsd|openbsd|dragonfly|osf1|osf3|hpux|linuxaout|kfreebsdgnu|freebsd2|solaris2|cygwin32|mingw32|darwin|gnu|nextstep2|nextstep3|sunos4|ultrix|irix|aix|haiku)
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        ;;
    *)
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        echo "Unknown OS '$1'"
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        exit 1
        ;;
    esac
}

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BuildPlatform="$BuildArch-$BuildVendor-$BuildOS"
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BuildPlatform_CPP=`echo "$BuildPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
BuildArch_CPP=`    echo "$BuildArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
BuildVendor_CPP=`  echo "$BuildVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
BuildOS_CPP=`      echo "$BuildOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`
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checkArch "$BuildArch"
checkVendor "$BuildVendor"
checkOS "$BuildOS"
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HostPlatform="$HostArch-$HostVendor-$HostOS"
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HostPlatform_CPP=`echo "$HostPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
HostArch_CPP=`    echo "$HostArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
HostVendor_CPP=`  echo "$HostVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
HostOS_CPP=`      echo "$HostOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`
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checkArch "$HostArch"
checkVendor "$HostVendor"
checkOS "$HostOS"
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TargetPlatform="$TargetArch-$TargetVendor-$TargetOS"
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TargetPlatform_CPP=`echo "$TargetPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
TargetArch_CPP=`    echo "$TargetArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
TargetVendor_CPP=`  echo "$TargetVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
TargetOS_CPP=`      echo "$TargetOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`
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checkArch "$TargetArch"
checkVendor "$TargetVendor"
checkOS "$TargetOS"
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# Verify that the installed (bootstrap) GHC is capable of generating
# code for the requested build platform.
if test "$build" != "$bootstrap_target"
then
    echo "This GHC (${WithGhc}) does not generate code for the build platform"
    echo "   GHC target platform    : $bootstrap_target"
    echo "   Desired build platform : $BuildPlatform"
    exit 1
fi

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AC_SUBST(BuildPlatform)
AC_SUBST(HostPlatform)
AC_SUBST(TargetPlatform)
AC_SUBST(HostPlatform_CPP)
AC_SUBST(BuildPlatform_CPP)
AC_SUBST(TargetPlatform_CPP)

AC_SUBST(HostArch_CPP)
AC_SUBST(BuildArch_CPP)
AC_SUBST(TargetArch_CPP)

AC_SUBST(HostOS_CPP)
AC_SUBST(BuildOS_CPP)
AC_SUBST(TargetOS_CPP)

AC_SUBST(HostVendor_CPP)
AC_SUBST(BuildVendor_CPP)
AC_SUBST(TargetVendor_CPP)

AC_SUBST(exeext)
AC_SUBST(soext)

AC_ARG_WITH(hc,
[AC_HELP_STRING([--with-hc=ARG],
        [Use ARG as the path to the compiler for compiling ordinary
         Haskell code  (default= value of --with-ghc)])],
[WithHc="$withval"],
[WithHc=$WithGhc]
)
AC_SUBST(WithHc)

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# This uses GHC, so put it after the "GHC is required" check above:
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FP_INTREE_GHC_PWD
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FP_FIND_ROOT

if test "$HostOS" = "mingw32"
then
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    test -d inplace || mkdir inplace

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    CC="$hardtop/inplace/mingw/bin/gcc.exe"
    LD="$hardtop/inplace/mingw/bin/ld.exe"
    NM="$hardtop/inplace/mingw/bin/nm.exe"
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    fp_prog_ar_raw="$hardtop/inplace/mingw/bin/ar.exe"
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    # NB. If you update the tarbballs to a new version of gcc, don't
    # forget to tweak the paths in driver/gcc/gcc.c.
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    if ! test -d inplace/mingw ||
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         test inplace/mingw -ot ghc-tarballs/mingw/binutils*.tar.lzma  ||
         test inplace/mingw -ot ghc-tarballs/mingw/gcc-core*.tar.lzma  ||
         test inplace/mingw -ot ghc-tarballs/mingw/gcc-c++*.tar.lzma   ||
         test inplace/mingw -ot ghc-tarballs/mingw/libgmp*.tar.gz      ||
         test inplace/mingw -ot ghc-tarballs/mingw/libmpc*.tar.gz      ||
         test inplace/mingw -ot ghc-tarballs/mingw/libmpfr*.tar.gz     ||
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         test inplace/mingw -ot ghc-tarballs/mingw/libstdc*.tar.lzma   ||
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         test inplace/mingw -ot ghc-tarballs/mingw/mingwrt*-dev.tar.gz ||
         test inplace/mingw -ot ghc-tarballs/mingw/mingwrt*-dll.tar.gz ||
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         test inplace/mingw -ot ghc-tarballs/mingw/w32api*.tar.lzma
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    then
        AC_MSG_NOTICE([Making in-tree mingw tree])
        rm -rf inplace/mingw
        mkdir inplace/mingw
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        (
            cd inplace/mingw &&
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            tar --lzma -xf ../../ghc-tarballs/mingw/binutils*.tar.lzma  &&
            tar --lzma -xf ../../ghc-tarballs/mingw/gcc-core*.tar.lzma  &&
            tar --lzma -xf ../../ghc-tarballs/mingw/gcc-c++*.tar.lzma   &&
            tar --lzma -xf ../../ghc-tarballs/mingw/libgmp*.tar.lzma    &&
            tar --lzma -xf ../../ghc-tarballs/mingw/libmpc*.tar.lzma    &&
            tar --lzma -xf ../../ghc-tarballs/mingw/libmpfr*.tar.lzma   &&
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            tar --lzma -xf ../../ghc-tarballs/mingw/libstdc*.tar.lzma   &&
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            tar -z     -xf ../../ghc-tarballs/mingw/mingwrt*-dev.tar.gz &&
            tar -z     -xf ../../ghc-tarballs/mingw/mingwrt*-dll.tar.gz &&
            tar --lzma -xf ../../ghc-tarballs/mingw/w32api*.tar.lzma    &&
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            mv bin/gcc.exe bin/realgcc.exe
        )
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        PATH=`pwd`/inplace/mingw/bin:$PATH inplace/mingw/bin/realgcc.exe driver/gcc/gcc.c driver/utils/cwrapper.c driver/utils/getLocation.c -Idriver/utils -o inplace/mingw/bin/gcc.exe
        if ! test -e inplace/mingw/bin/gcc.exe
        then
            AC_MSG_ERROR([GHC is required unless bootstrapping from .hc files.])
        fi
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        AC_MSG_NOTICE([In-tree mingw tree created])
    fi
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    if ! test -d inplace/perl ||
         test inplace/perl -ot ghc-tarballs/perl/ghc-perl*.tar.gz
    then
        AC_MSG_NOTICE([Making in-tree perl tree])
        rm -rf inplace/perl
        mkdir inplace
        mkdir inplace/perl
        (
            cd inplace/perl &&
            tar -zxf ../../ghc-tarballs/perl/ghc-perl*.tar.gz
        )
        AC_MSG_NOTICE([In-tree perl tree created])
    fi
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fi

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dnl ** Which gcc to use?
dnl --------------------------------------------------------------
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FP_ARG_WITH_PATH_GNU_PROG([CC], [gcc])
export CC
WhatGccIsCalled="$CC"
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AC_SUBST(WhatGccIsCalled)

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dnl ** Which ld to use?
dnl --------------------------------------------------------------
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FP_ARG_WITH_PATH_GNU_PROG([LD], [ld])
LdCmd="$LD"
AC_SUBST([LdCmd])
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dnl ** Which nm to use?
dnl --------------------------------------------------------------
FP_ARG_WITH_PATH_GNU_PROG([NM], [nm])
NmCmd="$NM"
AC_SUBST([NmCmd])
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dnl ** Mac OS X: explicit deployment target
dnl --------------------------------------------------------------
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AC_ARG_WITH([macosx-deployment-target],
[AC_HELP_STRING([--with-macosx-deployment-target=VERSION],
        [Build for Mac OS VERSION and higher  (default= version of build host)])],
[FP_MACOSX_DEPLOYMENT_TARGET="$withval"
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 if test "x$TargetOS_CPP-$TargetVendor_CPP" != "xdarwin-apple"; then
   # ignore everywhere, but on Mac OS
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   AC_MSG_WARN([--macosx-deployment-target is only available on Mac OS X])
   FP_MACOSX_DEPLOYMENT_TARGET=none
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 fi],
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[FP_MACOSX_DEPLOYMENT_TARGET=none]
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)
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FP_CHECK_MACOSX_DEPLOYMENT_TARGET
AC_SUBST(MACOSX_DEPLOYMENT_VERSION)
AC_SUBST(MACOSX_DEPLOYMENT_SDK)
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dnl --------------------------------------------------------------
dnl End of configure script option section
dnl --------------------------------------------------------------


dnl --------------------------------------------------------------
dnl * General configuration checks
dnl --------------------------------------------------------------
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dnl ** Can the unix package be built?
dnl --------------------------------------------------------------

if test x"$TargetPlatform" = x"i386-unknown-mingw32"; then
   GhcLibsWithUnix=NO
else
   GhcLibsWithUnix=YES
fi
AC_SUBST([GhcLibsWithUnix])

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dnl ** does #! work?
AC_SYS_INTERPRETER()
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dnl ** look for `perl'
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case $HostOS_CPP in
cygwin32|mingw32)
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    PerlCmd=$hardtop/inplace/perl/perl
    ;;
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*)
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    AC_PATH_PROG(PerlCmd,perl)
    if test -z "$PerlCmd"
    then
        echo "You must install perl before you can continue"
        echo "Perhaps it is already installed, but not in your PATH?"
        exit 1
    else
        FPTOOLS_CHECK_PERL_VERSION
    fi
    ;;
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esac
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dnl ** does #! path/to/perl work? (sometimes it's too long...)
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FPTOOLS_SHEBANG_PERL
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dnl ** check for Python
AC_PATH_PROG(PythonCmd,python)

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dnl ** look for GCC and find out which version
dnl     Figure out which C compiler to use.  Gcc is preferred.
dnl     If gcc, make sure it's at least 2.1
dnl
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FP_HAVE_GCC
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FPTOOLS_SET_C_LD_FLAGS([target],[CFLAGS],[LDFLAGS],[IGNORE_LINKER_LD_FLAGS],[CPPFLAGS])
FPTOOLS_SET_C_LD_FLAGS([build],[CONF_CC_OPTS_STAGE0],[CONF_GCC_LINKER_OPTS_STAGE0],[CONF_LD_LINKER_OPTS_STAGE0],[CONF_CPP_OPTS_STAGE0])
FPTOOLS_SET_C_LD_FLAGS([target],[CONF_CC_OPTS_STAGE1],[CONF_GCC_LINKER_OPTS_STAGE1],[CONF_LD_LINKER_OPTS_STAGE1],[CONF_CPP_OPTS_STAGE1])
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# Stage 3 won't be supported by cross-compilation
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FPTOOLS_SET_C_LD_FLAGS([target],[CONF_CC_OPTS_STAGE2],[CONF_GCC_LINKER_OPTS_STAGE2],[CONF_LD_LINKER_OPTS_STAGE2],[CONF_CPP_OPTS_STAGE2])
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FP_GCC_EXTRA_FLAGS
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dnl ** figure out how to invoke cpp directly (gcc -E is no good)
AC_PROG_CPP
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AC_SUBST(CONF_CC_OPTS_STAGE0)
AC_SUBST(CONF_CC_OPTS_STAGE1)
AC_SUBST(CONF_CC_OPTS_STAGE2)
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AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE0)
AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE1)
AC_SUBST(CONF_GCC_LINKER_OPTS_STAGE2)
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE0)
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE1)
AC_SUBST(CONF_LD_LINKER_OPTS_STAGE2)
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AC_SUBST(CONF_CPP_OPTS_STAGE0)
AC_SUBST(CONF_CPP_OPTS_STAGE1)
AC_SUBST(CONF_CPP_OPTS_STAGE2)
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dnl ** figure out how to do context diffs
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FP_PROG_CONTEXT_DIFF
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dnl Let's make sure install-sh is executable here.  If we got it from
dnl a darcs repo, it might not be (see bug #978).
chmod +x install-sh
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dnl ** figure out how to do a BSD-ish install
AC_PROG_INSTALL
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dnl If you can run configure, you certainly have /bin/sh
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AC_DEFINE([HAVE_BIN_SH], [1], [Define to 1 if you have /bin/sh.])
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dnl ** how to invoke `ar' and `ranlib'
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FP_PROG_AR_SUPPORTS_ATFILE
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FP_PROG_AR_NEEDS_RANLIB
FP_PROG_AR_SUPPORTS_INPUT
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dnl ** Check to see whether ln -s works
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AC_PROG_LN_S

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dnl ** Find the path to sed
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AC_PATH_PROGS(SedCmd,gsed sed,sed)
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dnl ** check for time command
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AC_PATH_PROG(TimeCmd,time)

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dnl ** check for tar
dnl   if GNU tar is named gtar, look for it first.
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AC_PATH_PROGS(TarCmd,gnutar gtar tar,tar)
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dnl ** check for patch
dnl if GNU patch is named gpatch, look for it first
AC_PATH_PROGS(PatchCmd,gpatch patch, patch)

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dnl ** check for dtrace (currently only implemented for Mac OS X)
HaveDtrace=NO
AC_PATH_PROG(DtraceCmd,dtrace)
if test -n "$DtraceCmd"; then
  if test "x$TargetOS_CPP-$TargetVendor_CPP" == "xdarwin-apple"; then
    HaveDtrace=YES
  fi
fi
AC_SUBST(HaveDtrace)

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AC_PATH_PROG(HSCOLOUR,HsColour)
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# HsColour is passed to Cabal, so we need a native path
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if test "x$HostPlatform"  = "xi386-unknown-mingw32" && \
   test "${OSTYPE}"      != "msys"                  && \
   test "${HSCOLOUR}"    != ""
then
    # Canonicalise to <drive>:/path/to/gcc
    HSCOLOUR=`cygpath -m ${HSCOLOUR}`
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fi
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dnl ** check for DocBook toolchain
FP_CHECK_DOCBOOK_DTD
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FP_DOCBOOK_XSL
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FP_PROG_DBLATEX

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FP_PROG_HSTAGS

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dnl ** check for ghc-pkg command
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FP_PROG_GHC_PKG
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dnl ** check for installed happy binary + version
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dnl    (don't do it if we're booting from .hc files though.)
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if test "$BootingFromHc" = "NO"; then
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FPTOOLS_HAPPY
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fi;
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dnl ** check for installed alex binary + version
dnl    (don't do it if we're booting from .hc files though.)
if test "$BootingFromHc" = "NO"; then
FPTOOLS_ALEX
fi;

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dnl --------------------------------------------------
dnl ### program checking section ends here ###
dnl --------------------------------------------------
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dnl --------------------------------------------------
dnl * Platform header file and syscall feature tests
dnl ### checking the state of the local header files and syscalls ###
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dnl ** check for full ANSI header (.h) files
AC_HEADER_STDC
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dnl ** Enable large file support.  NB. do this before testing the type of
dnl    off_t, because it will affect the result of that test.
AC_SYS_LARGEFILE

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dnl ** check for specific header (.h) files that we are interested in
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AC_CHECK_HEADERS([bfd.h ctype.h dirent.h dlfcn.h errno.h fcntl.h grp.h limits.h locale.h nlist.h pthread.h pwd.h signal.h sys/cpuset.h sys/mman.h sys/resource.h sys/select.h sys/time.h sys/timeb.h sys/timers.h sys/times.h sys/utsname.h sys/wait.h termios.h time.h utime.h windows.h winsock.h sched.h])
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dnl ** check if it is safe to include both <time.h> and <sys/time.h>
AC_HEADER_TIME
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dnl ** do we have long longs?
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AC_CHECK_TYPES([long long])
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dnl ** what are the sizes of various types
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AC_CHECK_SIZEOF(char,               1)
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AC_CHECK_SIZEOF(double,             8)
AC_CHECK_SIZEOF(float,              4)
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AC_CHECK_SIZEOF(int,                4)
AC_CHECK_SIZEOF(long,               4)
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if test "$ac_cv_type_long_long" = yes; then
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AC_CHECK_SIZEOF(long long,          8)
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fi
AC_CHECK_SIZEOF(short,              2)
AC_CHECK_SIZEOF(unsigned char,      1)
AC_CHECK_SIZEOF(unsigned int,       4)
AC_CHECK_SIZEOF(unsigned long,      4)
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if test "$ac_cv_type_long_long" = yes; then
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AC_CHECK_SIZEOF(unsigned long long, 8)
fi
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AC_CHECK_SIZEOF(unsigned short,     2)
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AC_CHECK_SIZEOF(void *,             4)
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dnl ** what are alignment constraints on various types
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FP_CHECK_ALIGNMENT(char)
FP_CHECK_ALIGNMENT(double)
FP_CHECK_ALIGNMENT(float)
FP_CHECK_ALIGNMENT(int)
FP_CHECK_ALIGNMENT(long)
if test "$ac_cv_type_long_long" = yes; then
FP_CHECK_ALIGNMENT(long long)
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fi
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FP_CHECK_ALIGNMENT(short)
FP_CHECK_ALIGNMENT(unsigned char)
FP_CHECK_ALIGNMENT(unsigned int)
FP_CHECK_ALIGNMENT(unsigned long)
if test "$ac_cv_type_long_long" = yes; then
FP_CHECK_ALIGNMENT(unsigned long long)
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fi
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FP_CHECK_ALIGNMENT(unsigned short)
FP_CHECK_ALIGNMENT(void *)
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FP_CHECK_FUNC([WinExec],
  [@%:@include <windows.h>], [WinExec("",0)])
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FP_CHECK_FUNC([GetModuleFileName],
  [@%:@include <windows.h>], [GetModuleFileName((HMODULE)0,(LPTSTR)0,0)])
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dnl ** check return type of signal handlers
dnl Foo: assumes we can use prototypes.
dnl On BCC, signal handlers have type "int(void)", elsewhere its "void(int)".
dnl AC_CACHE_CHECK([type of signal handlers], ac_cv_type_signal_handler,
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dnl [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
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dnl #include <signal.h>
dnl #ifdef signal
dnl #undef signal
dnl #endif
dnl void (*signal (int, void (*)(int)))(int);
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dnl ]],
dnl [[int i;]])],
dnl [ac_cv_type_signal_handler=void_int],
dnl [ac_cv_type_signal_handler=int_void])])
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dnl if test "$ac_cv_type_signal_handler" = void_int; then
dnl AC_DEFINE(VOID_INT_SIGNALS)
dnl fi

dnl On BCC, signal handlers have type "int(void)", elsewhere its "void(int)".
AC_TYPE_SIGNAL
if test "$ac_cv_type_signal" = void; then
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  AC_DEFINE([VOID_INT_SIGNALS], [1], [Define to 1 if signal handlers have type void (*)(int). Otherwise, they're assumed to have type int (*)(void).])
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fi

dnl ** check for more functions
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dnl ** The following have been verified to be used in ghc/, but might be used somewhere else, too.
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AC_CHECK_FUNCS([getclock getrusage gettimeofday setitimer siginterrupt sysconf times ctime_r sched_setaffinity setlocale])
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AC_TRY_RUN([
#include <sys/types.h>
#include <sys/time.h>
int main(void) {
  struct itimerval tval;
  tval.it_value.tv_sec = 1;
  tval.it_value.tv_usec = 0;
  tval.it_interval = tval.it_value;
  return setitimer(ITIMER_VIRTUAL, &tval, (void*)0) != 0;
}
],[AC_DEFINE([HAVE_SETITIMER_VIRTUAL], [1], [Define to 1 if setitimer accepts ITIMER_VIRTUAL, 0 else.])])

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dnl ** On OS X 10.4 (at least), time.h doesn't declare ctime_r if
dnl ** _POSIX_C_SOURCE is defined
AC_CHECK_DECLS([ctime_r], , ,
[#define _POSIX_SOURCE 1
#define _POSIX_C_SOURCE 199506L
#include <time.h>])

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dnl ** check for mingwex library
AC_CHECK_LIB(mingwex, closedir, HaveLibMingwEx=YES, HaveLibMingwEx=NO)
AC_SUBST(HaveLibMingwEx)

if test $HaveLibMingwEx = YES ; then
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  AC_DEFINE([HAVE_MINGWEX], [1], [Define to 1 if you have the mingwex library.])
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fi

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dnl ** check for math library
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dnl    Keep that check as early as possible.
dnl    as we need to know whether we need libm
dnl    for math functions or not
dnl    (see http://hackage.haskell.org/trac/ghc/ticket/3730)
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AC_CHECK_LIB(m, atan, HaveLibM=YES, HaveLibM=NO)
if test $HaveLibM = YES
then
  AC_DEFINE([HAVE_LIBM], [1], [Define to 1 if you need to link with libm])
fi
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dnl ** check whether this machine has BFD and liberty installed (used for debugging)
dnl    the order of these tests matters: bfd needs liberty
AC_CHECK_LIB(iberty, xmalloc)
AC_CHECK_LIB(bfd,    bfd_init)

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dnl ################################################################
dnl Check for libraries
dnl ################################################################

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dnl ** check whether we need -ldl to get dlopen()
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AC_CHECK_LIB(dl, dlopen,
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    [HaveLibDL=YES
     AC_DEFINE([HAVE_LIBDL], [1], [Define to 1 if you need -ldl to get dlopen().])
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     LIBS="$LIBS -ldl"],
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    [HaveLibDL=NO])
AC_SUBST(HaveLibDL)

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dnl --------------------------------------------------
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dnl * Miscellaneous feature tests
dnl --------------------------------------------------

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dnl ** can we get alloca?
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AC_FUNC_ALLOCA
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dnl ** Working vfork?
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AC_FUNC_FORK
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dnl ** determine whether or not const works
AC_C_CONST
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dnl ** are we big endian?
AC_C_BIGENDIAN
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FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN
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dnl ** check for leading underscores in symbol names
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dnl ** check for ld, whether it has an -x option, and if it is GNU ld
FP_PROG_LD_X
FP_PROG_LD_IS_GNU
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dnl ** check for Apple-style dead-stripping support
dnl    (.subsections-via-symbols assembler directive)


AC_MSG_CHECKING(for .subsections_via_symbols)
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AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([], [__asm__ (".subsections_via_symbols");])],
    [AC_MSG_RESULT(yes)
     AC_DEFINE([HAVE_SUBSECTIONS_VIA_SYMBOLS],[1],
               [Define to 1 if Apple-style dead-stripping is supported.])
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    ],
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    [AC_MSG_RESULT(no)])
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dnl *** check for GNU non-executable stack note support (ELF only)
dnl     (.section .note.GNU-stack,"",@progbits)

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dnl This test doesn't work with "gcc -g" in gcc 4.4 (GHC trac #3889:
dnl     Error: can't resolve `.note.GNU-stack' {.note.GNU-stack section} - `.Ltext0' {.text section}
dnl so we empty CFLAGS while running this test
CFLAGS2="$CFLAGS"
CFLAGS=
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AC_MSG_CHECKING(for GNU non-executable stack support)
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([__asm__ (".section .note.GNU-stack,\"\",@progbits");], [0])],
    [AC_MSG_RESULT(yes)
     AC_DEFINE([HAVE_GNU_NONEXEC_STACK],[1],
               [Define to 1 if GNU non-executable stack notes are supported.])
    ],
    [AC_MSG_RESULT(no)])
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CFLAGS="$CFLAGS2"
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FP_VISIBILITY_HIDDEN

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dnl ** check for librt
AC_CHECK_LIB(rt, clock_gettime)
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AC_CHECK_FUNCS(clock_gettime timer_create timer_settime)
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FP_CHECK_TIMER_CREATE
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dnl ** check for Apple's "interesting" long double compatibility scheme
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AC_MSG_CHECKING(for printf\$LDBLStub)
AC_TRY_LINK_FUNC(printf\$LDBLStub,
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    [
        AC_MSG_RESULT(yes)
        AC_DEFINE([HAVE_PRINTF_LDBLSTUB],[1],
            [Define to 1 if we have printf$LDBLStub (Apple Mac OS >= 10.4, PPC).])
    ],
    [
        AC_MSG_RESULT(no)
        AC_DEFINE([HAVE_PRINTF_LDBLSTUB],[0],
            [Define to 1 if we have printf$LDBLStub (Apple Mac OS >= 10.4, PPC).])
    ])

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dnl ** check for eventfd which is needed by the I/O manager
AC_CHECK_HEADERS([sys/eventfd.h])
AC_CHECK_FUNCS([eventfd])

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# test for GTK+
AC_PATH_PROGS([GTK_CONFIG], [pkg-config])
if test -n "$GTK_CONFIG"; then
  if $GTK_CONFIG gtk+-2.0 --atleast-version=2.0; then
    GTK_CONFIG="$GTK_CONFIG gtk+-2.0"
  else
    AC_MSG_WARN([GTK+ not usable, need at least version 2.0])
    GTK_CONFIG=
  fi
fi
AC_SUBST([GTK_CONFIG])
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#Checking for PAPI
AC_CHECK_LIB(papi, PAPI_library_init, HavePapiLib=YES, HavePapiLib=NO)
AC_CHECK_HEADER([papi.h], [HavePapiHeader=YES], [HavePapiHeader=NO])
AC_SUBST(HavePapiLib)
AC_SUBST(HavePapiHeader)

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AC_CHECK_FUNCS(__mingw_vfprintf)

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if test "$HavePapiLib" = "YES" -a "$HavePapiHeader" = "YES"; then
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   HavePapi=YES
else
   HavePapi=NO
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fi
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AC_SUBST(HavePapi)
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if test "$HAVE_DOCBOOK_XSL" = "NO" ||
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   test "$XsltprocCmd" = ""
then
    BUILD_DOCBOOK_HTML=NO
else
    BUILD_DOCBOOK_HTML=YES
fi
AC_SUBST(BUILD_DOCBOOK_HTML)

if test "$DblatexCmd" = ""
then
    BUILD_DOCBOOK_PS=NO
    BUILD_DOCBOOK_PDF=NO
else
    BUILD_DOCBOOK_PS=YES
    BUILD_DOCBOOK_PDF=YES
fi
AC_SUBST(BUILD_DOCBOOK_PS)
AC_SUBST(BUILD_DOCBOOK_PDF)

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LIBRARY_VERSION(base)
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LIBRARY_VERSION(Cabal)
LIBRARY_VERSION(ghc-prim)
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LIBRARY_ghc_VERSION="$ProjectVersion"
AC_SUBST(LIBRARY_ghc_VERSION)
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if grep '	' compiler/ghc.cabal.in 2>&1 >/dev/null; then
   AC_MSG_ERROR([compiler/ghc.cabal.in contains tab characters; please remove them])
fi

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AC_CONFIG_FILES([mk/config.mk mk/install.mk mk/project.mk compiler/ghc.cabal ghc/ghc-bin.cabal utils/runghc/runghc.cabal ghc.spec extra-gcc-opts docs/users_guide/ug-book.xml docs/users_guide/ug-ent.xml docs/index.html libraries/prologue.txt distrib/ghc.iss distrib/configure.ac distrib/MacOS/installer-scripts/create-links distrib/MacOS/installer-scripts/Uninstaller distrib/MacOS/GHC-system.pmdoc/index.xml])
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AC_CONFIG_COMMANDS([mk/stamp-h],[echo timestamp > mk/stamp-h])
AC_OUTPUT
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# We get caught by
#     http://savannah.gnu.org/bugs/index.php?1516
#     $(eval ...) inside conditionals causes errors
# with make 3.80, so warn the user if it looks like they're about to
# try to use it.
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# We would use "grep -q" here, but Solaris's grep doesn't support it.
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checkMake380() {
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    if $1 --version 2>&1 | head -1 | grep 'GNU Make 3\.80' > /dev/null
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    then
        echo
        echo "WARNING: It looks like \"$1\" is GNU make 3.80."
        echo "This version cannot be used to build GHC."
        echo "Please use GNU make >= 3.81."
    fi
}

checkMake380 make
checkMake380 gmake

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echo ["
----------------------------------------------------------------------
Configure completed successfully.

   Building GHC version  : $ProjectVersion

   Build platform        : $BuildPlatform
   Host platform         : $HostPlatform
   Target platform       : $TargetPlatform
"]

if test "$BootingFromHc" = "YES"; then
echo ["\
   Bootstrapping from HC files.
"]
else
echo ["\
   Bootstrapping using   : $WithGhc
      which is version   : $GhcVersion
"]
fi

echo ["\
   Using GCC             : $WhatGccIsCalled
      which is version   : $GccVersion

   ld       : $LdCmd
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   Happy    : $HappyCmd ($HappyVersion)
   Alex     : $AlexCmd ($AlexVersion)
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   Python   : $PythonCmd
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   Perl     : $PerlCmd
   dblatex  : $DblatexCmd
   xsltproc : $XsltprocCmd"]
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if test "$HSCOLOUR" = ""; then
echo ["
   HsColour was not found; documentation will not contain source links
"]
else
echo ["\
   HsColour : $HSCOLOUR
"]
fi

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echo ["\
   Building DocBook HTML documentation : $BUILD_DOCBOOK_HTML
   Building DocBook PS documentation   : $BUILD_DOCBOOK_PS
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   Building DocBook PDF documentation  : $BUILD_DOCBOOK_PDF"]
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echo ["----------------------------------------------------------------------
"]

echo "\
For a standard build of GHC (fully optimised with profiling), type (g)make.

To make changes to the default build configuration, copy the file
mk/build.mk.sample to mk/build.mk, and edit the settings in there.

For more information on how to configure your GHC build, see
   http://hackage.haskell.org/trac/ghc/wiki/Building
"