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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 1994-2012
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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], [8.0.2], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])
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# Set this to YES for a released version, otherwise NO
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: ${RELEASE=YES}
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# The primary version (e.g. 7.5, 7.4.1) is set in the AC_INIT line
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# above.  If this is not a released version, then we will append the
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# date to the version number (e.g. 7.4.20111220).  The date is
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# constructed by finding the date of the most recent patch in the
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# git repository.  If this is a source distribution (not a git
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# 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 ----------------------------------------------------------
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dnl ** Find unixy sort and find commands,
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dnl ** which are needed by FP_SETUP_PROJECT_VERSION

dnl ** Find find command (for Win32's benefit)
FP_PROG_FIND
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FP_PROG_SORT
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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 2.60
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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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dnl Using autoconf 2.59 started to give nonsense like this
dnl  #define SIZEOF_CHAR 0
dnl recently.
AC_PREREQ([2.60])
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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
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dnl $OSTYPE is set by the operating system to "msys" or "cygwin" or something
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AC_SUBST(OSTYPE)

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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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AC_ARG_ENABLE(tarballs-autodownload,
[AC_HELP_STRING([--enable-tarballs-autodownload],
                [Automatically download Windows distribution binaries if needed.])],
        TarballsAutodownload=YES,
        TarballsAutodownload=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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  BOOTSTRAPPING_GHC_INFO_FIELD([CC_STAGE0],[C compiler command])
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  BOOTSTRAPPING_GHC_INFO_FIELD([LD_STAGE0],[ld command])
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  BOOTSTRAPPING_GHC_INFO_FIELD([AR_STAGE0],[ar command])
  BOOTSTRAPPING_GHC_INFO_FIELD([AR_OPTS_STAGE0],[ar flags])
  BOOTSTRAPPING_GHC_INFO_FIELD([ArSupportsAtFile_STAGE0],[ar supports at file])
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fi

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dnl ** Must have GHC to build GHC
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if test "$WithGhc" = ""
then
    AC_MSG_ERROR([GHC is required.])
fi
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FP_COMPARE_VERSIONS([$GhcVersion],[-lt],[7.8],
    [AC_MSG_ERROR([GHC version 7.8 or later is required to compile GHC.])])
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if test `expr $GhcMinVersion % 2` = "1"
then
    if test "$EnableBootstrapWithDevelSnaphost" = "NO"
    then
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        AC_MSG_ERROR([
     $WithGhc is a development snapshot of GHC, version $GhcVersion.
     Bootstrapping using this version of GHC is not supported, and may not
     work.  Use --enable-bootstrap-with-devel-snapshot to try it anyway,
     or --with-ghc to specify a different GHC to use.])
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    fi
fi
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GHC_PACKAGE_DB_FLAG=package-db
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AC_SUBST(GHC_PACKAGE_DB_FLAG)
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# GHC 7.7+ needs -fcmm-sink when compiling Parser.hs. See #8182
FP_COMPARE_VERSIONS([$GhcVersion],[-gt],[7.7],
                    CMM_SINK_BOOTSTRAP_IS_NEEDED=YES,
                    CMM_SINK_BOOTSTRAP_IS_NEEDED=NO)
AC_SUBST(CMM_SINK_BOOTSTRAP_IS_NEEDED)

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FP_COMPARE_VERSIONS([$GhcVersion],[-lt],[7.9],
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                    SUPPORTS_COMPONENT_ID=NO,
                    SUPPORTS_COMPONENT_ID=YES)
AC_SUBST(SUPPORTS_COMPONENT_ID)
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FP_COMPARE_VERSIONS([$GhcVersion],[-lt],[7.11],
                    SUPPORTS_THIS_UNIT_ID=NO,
                    SUPPORTS_THIS_UNIT_ID=YES)
AC_SUBST(SUPPORTS_THIS_UNIT_ID)

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# GHC is passed to Cabal, so we need a native path
if test "${WithGhc}" != ""
then
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    ghc_host_os=`"${WithGhc}" +RTS --info | grep 'Host OS' | sed -e 's/.*, "//' -e 's/")//'`
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    if test "$ghc_host_os" = "mingw32"
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    then
        if test "${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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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

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FPTOOLS_SET_PLATFORM_VARS
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# Verify that the installed (bootstrap) GHC is capable of generating
# code for the requested build platform.
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if test "$BuildPlatform" != "$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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# Testing if we shall enable shared libs support on Solaris.
# Anything older than SunOS 5.11 aka Solaris 11 (Express) is broken.
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SOLARIS_BROKEN_SHLD=NO
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case $host in
     i386-*-solaris2)
     # here we go with the test
     MINOR=`uname -r|cut -d '.' -f 2-`
     if test "$MINOR" -lt "11"; then
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         SOLARIS_BROKEN_SHLD=YES
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     fi
     ;;
esac
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AC_SUBST(SOLARIS_BROKEN_SHLD)

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dnl ** Do an unregisterised build?
dnl --------------------------------------------------------------
case "$HostArch" in
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    i386|x86_64|powerpc|powerpc64|powerpc64le|arm)
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        UnregisterisedDefault=NO
        ;;
    *)
        UnregisterisedDefault=YES
        ;;
esac
AC_ARG_ENABLE(unregisterised,
[AC_HELP_STRING([--enable-unregisterised],
[Build an unregisterised compiler (enabled by default on platforms without registerised support) [default="$UnregisterisedDefault"]])],
[ if test x"$enableval" = x"yes"; then
        Unregisterised=YES
  else
        Unregisterised=NO
  fi
],
[Unregisterised="$UnregisterisedDefault"]
)
AC_SUBST(Unregisterised)

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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

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fail() {
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    echo >&2
    echo "$1" >&2
    exit 1
}

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if test "$HostOS" = "mingw32"
then
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    # Find the mingw-w64 7z file to extract.
    # NB. If you update the tarballs to a new version of gcc, don't
    # forget to tweak the paths in driver/gcc/gcc.c.
    if test "$HostArch" = "i386"
    then
        mingw_arch="i686"
        tarball_dest_dir="mingw-w64/x86"
        tarball_mingw_dir="mingw32"
    else
        mingw_arch="x86_64"
        tarball_dest_dir="mingw-w64/x86_64"
        tarball_mingw_dir="mingw64"
    fi
fi

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set_up_tarballs() {
    AC_MSG_NOTICE([Checking for Windows toolchain tarballs...])
    local action
    if test "$TarballsAutodownload" = "NO"
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    then
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        action="verify"
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    else
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        action="download"
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    fi
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    mk/get-win32-tarballs.sh $action $HostArch > missing-win32-tarballs
    case $? in
        0)
           rm missing-win32-tarballs
           ;;
        2)
           echo
           echo "Error:"
           echo "Needed msys2 tarballs are missing. You have a few options to get them,"
           echo
           echo "  * run configure with the --enable-tarballs-autodownload option"
           echo
           echo "  * run mk/get-win32-tarballs.sh download ${HostArch}"
           echo
           echo "  * manually download the files listed in ./missing-win32-tarballs and place"
           echo "    them in the ghc-tarballs directory."
           echo
           exit 1
           ;;
        *)
           echo
           echo "Error fetching msys2 tarballs; see errors above."
           exit 1
           ;;
    esac
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    # Extract all the tarballs in one go
    if ! test -d inplace/mingw
    then
        AC_MSG_NOTICE([Extracting Windows toolchain from archives (may take a while)...])
        rm -rf inplace/mingw
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        local base_dir="../ghc-tarballs/${tarball_dest_dir}"
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        ( cd inplace &&
        find "${base_dir}" -name "*.tar.xz" -exec tar xfJ {} \; &&
        rm ".MTREE" &&
        rm ".PKGINFO" &&
        cd .. ) || fail "Error: Could not extract Windows toolchains."

        mv "inplace/${tarball_mingw_dir}" inplace/mingw &&
        touch inplace/mingw

        # NB. Now since the GCC is hardcoded to use /mingw32 we need to
        # make a wrapper around it to give it the proper paths
        mv inplace/mingw/bin/gcc.exe inplace/mingw/bin/realgcc.exe
        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

        AC_MSG_NOTICE([In-tree MingW-w64 tree created])
    fi
}

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

    # NB. Download and extract the MingW-w64 distribution if required
    set_up_tarballs

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    mingwbin="$hardtop/inplace/mingw/bin/"
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    CC="${mingwbin}gcc.exe"
    LD="${mingwbin}ld.exe"
    NM="${mingwbin}nm.exe"
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    RANLIB="${mingwbin}ranlib.exe"
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    OBJDUMP="${mingwbin}objdump.exe"
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    fp_prog_ar="${mingwbin}ar.exe"
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    # NB. Download the perl binaries if required
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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/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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FP_ICONV
FP_GMP
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FP_CURSES
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XCODE_VERSION()
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SplitObjsBroken=NO
if test "$TargetOS_CPP" = "darwin"
then
    # Split objects is broken (#4013) with XCode < 3.2
    if test "$XCodeVersion1" -lt 3
    then
        SplitObjsBroken=YES
    else
        if test "$XCodeVersion1" -eq 3
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        then
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            if test "$XCodeVersion2" -lt 2
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            then
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                SplitObjsBroken=YES
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            fi
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        fi
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    fi
fi
AC_SUBST([SplitObjsBroken])

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dnl ** Building a cross compiler?
dnl --------------------------------------------------------------
CrossCompiling=NO
# If 'host' and 'target' differ, then this means we are building a cross-compiler.
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if test "$TargetPlatform" != "$HostPlatform" ; then
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    CrossCompiling=YES
    cross_compiling=yes   # This tells configure that it can accept just 'target',
                          # otherwise you get
                          #   configure: error: cannot run C compiled programs.
                          #   If you meant to cross compile, use `--host'.
fi
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if test "$BuildPlatform" != "$HostPlatform" ; then
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   AC_MSG_ERROR([
You've selected:

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  BUILD:  $BuildPlatform   (the architecture we're building on)
  HOST:   $HostPlatform    (the architecture the compiler we're building will execute on)
  TARGET: $TargetPlatform  (the architecture the compiler we're building will produce code for)
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BUILD must equal HOST; that is, we do not support building GHC itself
with a cross-compiler.  To cross-compile GHC itself, set TARGET: stage
1 will be a cross-compiler, and stage 2 will be the cross-compiled
GHC.
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])
fi
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if test "$CrossCompiling" = "YES"
then
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  CrossCompilePrefix="${target}-"
else
  CrossCompilePrefix=""
fi
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TargetPlatformFull="${TargetPlatform}"
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AC_SUBST(CrossCompiling)
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AC_SUBST(CrossCompilePrefix)
AC_SUBST(TargetPlatformFull)

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dnl ** Which gcc to use?
dnl --------------------------------------------------------------
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FIND_GCC([WhatGccIsCalled], [gcc], [gcc])
CC="$WhatGccIsCalled"
export CC
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# If --with-gcc was used, and we're not cross-compiling, then it also
# applies to the stage0 compiler.
MAYBE_OVERRIDE_STAGE0([gcc],[CC_STAGE0])
MAYBE_OVERRIDE_STAGE0([ar],[AR_STAGE0])

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dnl make extensions visible to allow feature-tests to detect them lateron
AC_USE_SYSTEM_EXTENSIONS

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dnl ** figure out how to invoke the C preprocessor (i.e. `gcc -E`)
AC_PROG_CPP

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# --with-hs-cpp/--with-hs-cpp-flags
FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
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AC_SUBST([HaskellCPPCmd])
AC_SUBST([HaskellCPPArgs])
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dnl ** Which ld to use?
dnl --------------------------------------------------------------
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FIND_LD([LdCmd])
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AC_SUBST([LdCmd])

dnl ** Which nm to use?
dnl --------------------------------------------------------------
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FP_ARG_WITH_PATH_GNU_PROG([NM], [nm], [nm])
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NmCmd="$NM"
AC_SUBST([NmCmd])

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dnl ** Which objdump to use?
dnl --------------------------------------------------------------
FP_ARG_WITH_PATH_GNU_PROG_OPTIONAL([OBJDUMP], [objdump], [objdump])
ObjdumpCmd="$OBJDUMP"
AC_SUBST([ObjdumpCmd])

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dnl ** Which ar to use?
dnl --------------------------------------------------------------
FP_ARG_WITH_PATH_GNU_PROG([AR], [ar], [ar])
ArCmd="$AR"
fp_prog_ar="$AR"
AC_SUBST([ArCmd])

dnl ** Which ranlib to use?
dnl --------------------------------------------------------------
FP_ARG_WITH_PATH_GNU_PROG([RANLIB], [ranlib], [ranlib])
RanlibCmd="$RANLIB"
RANLIB="$RanlibCmd"


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# Note: we may not have objdump on OS X, and we only need it on Windows (for DLL checks)
case $HostOS_CPP in
cygwin32|mingw32)
    dnl ** Which objdump to use?
    dnl --------------------------------------------------------------
    FP_ARG_WITH_PATH_GNU_PROG([OBJDUMP], [objdump], [objdump])
    ObjdumpCmd="$OBJDUMP"
    AC_SUBST([ObjdumpCmd])
    ;;
esac
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# Here is where we re-target which specific version of the LLVM
# tools we are looking for. In the past, GHC supported a number of
# versions of LLVM simultaneously, but that stopped working around
# 3.5/3.6 release of LLVM.
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LlvmVersion=3.7
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AC_SUBST([LlvmVersion])
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sUPPORTED_LLVM_VERSION=$(echo \($LlvmVersion\) | sed 's/\./,/')
AC_DEFINE_UNQUOTED([sUPPORTED_LLVM_VERSION], ${sUPPORTED_LLVM_VERSION}, [The supported LLVM version number])
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dnl ** Which LLVM llc to use?
dnl --------------------------------------------------------------
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FIND_LLVM_PROG([LLC], [llc], [llc], [$LlvmVersion])
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LlcCmd="$LLC"
AC_SUBST([LlcCmd])

dnl ** Which LLVM opt to use?
dnl --------------------------------------------------------------
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FIND_LLVM_PROG([OPT], [opt], [opt], [$LlvmVersion])
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OptCmd="$OPT"
AC_SUBST([OptCmd])

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dnl --------------------------------------------------------------
dnl End of configure script option section
dnl --------------------------------------------------------------


dnl --------------------------------------------------------------
dnl * General configuration checks
dnl --------------------------------------------------------------
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dnl ** Bug 9439: Some GHC 7.8 releases had broken LLVM code generator.
dnl Unfortunately we don't know whether the user is going to request a
dnl build with the LLVM backend as this is only given in build.mk.
dnl
dnl Instead, we try to do as much work as possible here, checking
dnl whether -fllvm is the stage 0 compiler's default. If so we
dnl fail. If not, we check whether -fllvm is affected explicitly and
dnl if so set a flag. The build system will later check this flag
dnl after the desired build flags are known.
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dnl This problem is further complicated by the fact that the llvm
dnl version used by the bootstrap compiler may be different from the
dnl version we arre trying to compile GHC against. Therefore, we need
dnl to find the boostrap compiler's `settings` file then check to see
dnl if the `opt` and `llc` command strings are non-empty and if these
dnl programs exist. Only if they exist to we test for bug #9439.

FIND_GHC_BOOTSTRAP_PROG([BootstrapLlcCmd], [${WithGhc}], "LLVM llc command")
FIND_GHC_BOOTSTRAP_PROG([BootstrapOptCmd], [${WithGhc}], "LLVM opt command")

if test -n "$BootstrapLlcCmd" && test -n "$BootstrapOptCmd"
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then
    AC_MSG_CHECKING(whether bootstrap compiler is affected by bug 9439)
    echo "main = putStrLn \"%function\"" > conftestghc.hs

    # Check whether LLVM backend is default for this platform
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    "${WithGhc}" -pgmlc="${BootstrapLlcCmd}" -pgmlo="${BootstrapOptCmd}" conftestghc.hs 2>&1 >/dev/null
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    res=`./conftestghc`
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    if test "x$res" = "x%object"
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    then
        AC_MSG_RESULT(yes)
        echo "Buggy bootstrap compiler"
        echo ""
        echo "The stage 0 compiler $WithGhc is affected by GHC Bug \#9439"
        echo "and therefore will miscompile the LLVM backend if -fllvm is"
        echo "used."
        echo
        echo "Please use another bootstrap compiler"
        exit 1
    fi

    # -fllvm is not the default, but set a flag so the Makefile can check
    # -for it in the build flags later on
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    "${WithGhc}" -fforce-recomp -pgmlc="${BootstrapLlcCmd}" -pgmlo="${BootstrapOptCmd}" -fllvm conftestghc.hs 2>&1 >/dev/null
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    if test $? = 0
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    then
        res=`./conftestghc`
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        if test "x$res" = "x%object"
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        then
            AC_MSG_RESULT(yes)
            GHC_LLVM_AFFECTED_BY_9439=1
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        elif test "x$res" = "x%function"
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        then
            AC_MSG_RESULT(no)
            GHC_LLVM_AFFECTED_BY_9439=0
        else
            AC_MSG_WARN(unexpected output $res)
        fi
    else
        AC_MSG_RESULT(failed to compile, assuming no)
    fi
fi
AC_SUBST([GHC_LLVM_AFFECTED_BY_9439])

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dnl ** Can the unix package be built?
dnl --------------------------------------------------------------

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if test "$TargetOS" = "mingw32"
then
    GhcLibsWithUnix=NO
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else
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    GhcLibsWithUnix=YES
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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 ** look for GCC and find out which version
dnl     Figure out which C compiler to use.  Gcc is preferred.
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dnl     If gcc, make sure it's at least 3.0
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dnl
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FP_GCC_VERSION
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dnl ** See whether gcc supports -no-pie
FP_GCC_SUPPORTS_NO_PIE

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dnl ** look to see if we have a C compiler using an llvm back end.
dnl
FP_CC_LLVM_BACKEND

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FP_PROG_LD_IS_GNU
FP_PROG_LD_BUILD_ID
FP_PROG_LD_NO_COMPACT_UNWIND
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FP_PROG_LD_FILELIST
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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])
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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# Stage 3 won't be supported by cross-compilation
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FP_GCC_EXTRA_FLAGS
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# See rules/distdir-way-opts.mk for details.
# Flags passed to the C compiler
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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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# Flags passed to the C compiler when we ask it to link
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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)
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# Flags passed to the linker when we ask it to link
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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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# Flags passed to the C preprocessor
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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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# Flags passed to the Haskell compiler
AC_SUBST(CONF_HC_OPTS_STAGE0)
AC_SUBST(CONF_HC_OPTS_STAGE1)
AC_SUBST(CONF_HC_OPTS_STAGE2)
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dnl ** Set up the variables for the platform in the settings file.
dnl May need to use gcc to find platform details.
dnl --------------------------------------------------------------
FPTOOLS_SET_HASKELL_PLATFORM_VARS

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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 ** how to invoke `ar' and `ranlib'
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FP_PROG_AR_SUPPORTS_ATFILE
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FP_PROG_AR_NEEDS_RANLIB
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dnl ** Check to see whether ln -s works
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AC_PROG_LN_S

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FP_SETTINGS
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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 "$DtraceCmd"; then
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  if test "x$TargetOS_CPP-$TargetVendor_CPP" = "xdarwin-apple" -o "x$TargetOS_CPP-$TargetVendor_CPP" = "xsolaris2-unknown"; then
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    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 "$HostOS"      = "mingw32" && \
   test "${OSTYPE}"   != "msys"    && \
   test "${HSCOLOUR}" != ""
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then
    # Canonicalise to <drive>:/path/to/gcc
    HSCOLOUR=`cygpath -m ${HSCOLOUR}`
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fi
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dnl ** check for Sphinx toolchain
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AC_PATH_PROG(SPHINXBUILD,sphinx-build)
AC_CACHE_CHECK([for version of sphinx-build], fp_cv_sphinx_version,
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changequote(, )dnl
[if test -n "$SPHINXBUILD"; then
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  fp_cv_sphinx_version=`"$SPHINXBUILD" --version 2>&1 | sed 's/Sphinx\( (sphinx-build)\)\? v\?\([0-9]\.[0-9]\.[0-9]\)/\2/' | head -n1`;
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fi;
changequote([, ])dnl
])
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FP_COMPARE_VERSIONS([$fp_cv_sphinx_version],-lt,1.0.0,
    [AC_MSG_WARN([Sphinx version 1.0.0 or later is required to build documentation]); SPHINXBUILD=;])
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dnl ** check for xelatex
AC_PATH_PROG(XELATEX,xelatex)
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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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FPTOOLS_HAPPY
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dnl ** check for installed alex binary + version
FPTOOLS_ALEX

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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([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/param.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 sys/cpuset.h needs sys/param.h to be included first on FreeBSD 9.1; #7708
AC_CHECK_HEADERS([sys/cpuset.h], [], [],
[[#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
]])
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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 for use in settings.in
WordSize=$ac_cv_sizeof_void_p
AC_SUBST(WordSize)

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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 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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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
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dnl    (see http://ghc.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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FP_BFD_SUPPORT
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dnl ################################################################
dnl Check for libraries
dnl ################################################################

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# system libffi

AC_ARG_WITH([system-libffi],
[AC_HELP_STRING([--with-system-libffi],
  [Use system provided libffi for RTS [default=no]])
])

AS_IF([test "x$with_system_libffi" = "xyes"],
  [UseSystemLibFFI="YES"], [UseSystemLibFFI="NO"]
)


AC_SUBST(UseSystemLibFFI)

AC_ARG_WITH([ffi-includes],
[AC_HELP_STRING([--with-ffi-includes=ARG],
  [Find includes for libffi in ARG [default=system default]])
],
[
 if test "x$UseSystemLibFFI" != "xYES"; then
    AC_MSG_WARN([--with-ffi-includes will be ignored, --with-system-libffi not set])
 else
    FFIIncludeDir="$withval"
    LIBFFI_CFLAGS="-I$withval"
 fi
])

AC_SUBST(FFIIncludeDir)

AC_ARG_WITH([ffi-libraries],
[AC_HELP_STRING([--with-ffi-libraries=ARG],
  [Find libffi in ARG [default=system default]])
],
[
 if test "x$UseSystemLibFFI" != "xYES"; then
    AC_MSG_WARN([--with-ffi-libraries will be ignored, --with-system-libffi not set])
 else
    FFILibDir="$withval" LIBFFI_LDFLAGS="-L$withval"
 fi
])

AC_SUBST(FFILibDir)

AS_IF([test "$UseSystemLibFFI" = "YES"], [
 CFLAGS2="$CFLAGS"
 CFLAGS="$LIBFFI_CFLAGS $CFLAGS"
 LDFLAGS2="$LDFLAGS"
 LDFLAGS="$LIBFFI_LDFLAGS $LDFLAGS"
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 if test "$HostOS" = "openbsd";
 then
   # OpenBSD's libffi is not directly linked to the libpthread but
   # still requires pthread functionality. This means that any client
   # binary which links with libffi also needs to link with
   # libpthread. If it does not, then linking fails with unresolved
   # symbols.
   LDFLAGS="$LDFLAGS -lpthread"
 fi
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 AC_CHECK_LIB(ffi, ffi_call,
  [AC_CHECK_HEADERS([ffi.h], [break], [])
   AC_DEFINE([HAVE_LIBFFI], [1], [Define to 1 if you have libffi.])],
  [AC_MSG_ERROR([Cannot find system libffi])])
 CFLAGS="$CFLAGS2"
 LDFLAGS="$LDFLAGS2"
])

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955
dnl ** check whether we need -ldl to get dlopen()
956
AC_CHECK_LIB(dl, dlopen)
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958
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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FP_LEADING_UNDERSCORE
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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_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 ** pthread_setname_np is a recent addition to glibc, and OS X has
dnl    a different single-argument version.
AC_CHECK_LIB(pthread, pthread_setname_np)
AC_MSG_CHECKING(for pthread_setname_np)
AC_TRY_LINK(
[
#define _GNU_SOURCE
#include <pthread.h>
],
[pthread_setname_np(pthread_self(), "name");],
    AC_MSG_RESULT(yes)
    AC_DEFINE([HAVE_PTHREAD_SETNAME_NP], [1],
      [Define to 1 if you have the glibc version of pthread_setname_np]),
    AC_MSG_RESULT(no)
)

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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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dnl ** Check for __thread support in the compiler
AC_MSG_CHECKING(for __thread support)
AC_COMPILE_IFELSE(
  [ AC_LANG_SOURCE([[__thread int tester = 0;]]) ],
  [
   AC_MSG_RESULT(yes)
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   AC_DEFINE([CC_SUPPORTS_TLS],[1],[Define to 1 if __thread is supported])
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  ],
  [
   AC_MSG_RESULT(no)
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   AC_DEFINE([CC_SUPPORTS_TLS],[0],[Define to 1 if __thread is supported])
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  ])

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dnl large address space support (see includes/rts/storage/MBlock.h)
dnl
dnl Darwin has vm_allocate/vm_protect
dnl Linux has mmap(MAP_NORESERVE)/madv(MADV_DONTNEED)
dnl FreeBSD, Solaris and maybe other have MAP_NORESERVE/MADV_FREE
dnl (They also have MADV_DONTNEED, but it means something else!)
dnl
dnl Windows has VirtualAlloc MEM_RESERVE/MEM_COMMIT, however
dnl it counts page-table space as committed memory, and so quickly
dnl runs out of paging file when we have multiple processes reserving
dnl 1TB of address space, we get the following error:
dnl    VirtualAlloc MEM_RESERVE 1099512676352 bytes failed: The paging file is too small for this operation to complete.
dnl
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AC_ARG_ENABLE(large-address-space,
    [AC_HELP_STRING([--enable-large-address-space],
        [Use a single large address space on 64 bit systems (enabled by default on 64 bit platforms)])],
    EnableLargeAddressSpace=$enableval,
    EnableLargeAddressSpace=yes
)

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use_large_address_space=no
if test "$ac_cv_sizeof_void_p" -eq 8 ; then
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    if test "x$EnableLargeAddressSpace" = "xyes" ; then
        if test "$ghc_host_os" = "darwin" ; then
            use_large_address_space=yes
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	elif test "$ghc_host_os" = "openbsd" ; then
	    # as of OpenBSD 5.8 (2015), OpenBSD does not support mmap with MAP_NORESERVE.
	    # The flag MAP_NORESERVE is supported for source compatibility reasons,
	    # but is completely ignored by OS mmap
            use_large_address_space=no
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