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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], [7.9], [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. 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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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([OS_STAGE0],[target os])
  BOOTSTRAPPING_GHC_INFO_FIELD([CC_STAGE0],[C compiler command])
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  dnl ToDo, once "ld command" is reliably available.
  dnl Then, we can remove the LD_STAGE0 hack in mk/build-package-date.mk
  dnl BOOTSTRAPPING_GHC_INFO_FIELD([LD_STAGE0],[ld command])
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  if test "x$OS_STAGE0" != "xOSDarwin"; then
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    BOOTSTRAPPING_GHC_INFO_FIELD([AR_STAGE0],[ar command])
    BOOTSTRAPPING_GHC_INFO_FIELD([AR_OPTS_STAGE0],[ar flags])
    BOOTSTRAPPING_GHC_INFO_FIELD([ArSupportsAtFile_STAGE0],[ar supports at file])
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  else
    AR_STAGE0='$(AR)'
    AR_OPTS_STAGE0='$(AR_OPTS)'
    ArSupportsAtFile_STAGE0='$(ArSupportsAtFile)'
  fi
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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],[7.6],
    [AC_MSG_ERROR([GHC version 7.6 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],
                    SUPPORTS_PACKAGE_KEY=NO,
                    SUPPORTS_PACKAGE_KEY=YES)
AC_SUBST(SUPPORTS_PACKAGE_KEY)

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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 ** 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.
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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"${WithGhc}" conftestghc.hs 2>&1 >/dev/null
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res=`./conftestghc`
if test "x$res" == "x%object"
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 -fllvm conftestghc.hs 2>&1 >/dev/null
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if test $? == 0
then
    res=`./conftestghc`
    if test "x$res" == "x%object"
    then
        AC_MSG_RESULT(yes)
        GHC_LLVM_AFFECTED_BY_9439=1
    elif test "x$res" == "x%function"
    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
AC_SUBST([GHC_LLVM_AFFECTED_BY_9439])

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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 "$HostArch" in
    i386|x86_64|powerpc|arm)
        UnregisterisedDefault=NO
        ;;
    *)
        UnregisterisedDefault=YES
        ;;
esac
AC_ARG_ENABLE(unregisterised,
[AC_HELP_STRING([--enable-unregisterised],
[Build an unregisterised compiler (enabled by default on platforms without registerised support) [default="$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

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

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    if test "$HostArch" = "i386"
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    then
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        # 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 -d inplace/mingw ||
             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/libgcc*.tar.gz      ||
             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     ||
             test inplace/mingw -ot ghc-tarballs/mingw/libstdc*.tar.lzma   ||
             test inplace/mingw -ot ghc-tarballs/mingw/mingwrt*-dev.tar.gz ||
             test inplace/mingw -ot ghc-tarballs/mingw/mingwrt*-dll.tar.gz ||
             test inplace/mingw -ot ghc-tarballs/mingw/w32api*.tar.lzma
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        then
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            AC_MSG_NOTICE([Making in-tree mingw tree])
            rm -rf inplace/mingw
            mkdir inplace/mingw
            (
                cd inplace/mingw &&
                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/libgcc*.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   &&
                tar --lzma -xf ../../ghc-tarballs/mingw/libstdc*.tar.lzma   &&
                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    &&
                mv bin/gcc.exe 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 tree created])
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        fi
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    else
        # 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 -d inplace/mingw ||
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             test inplace/mingw -ot ghc-tarballs/mingw64/*.tar.bz2
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        then
            AC_MSG_NOTICE([Making in-tree mingw tree])
            rm -rf inplace/mingw
            mkdir inplace/mingw
            (
                cd inplace/mingw &&
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                tar -jxf ../../ghc-tarballs/mingw64/*.tar.bz2
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            )
            AC_MSG_NOTICE([In-tree mingw tree created])
        fi
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    fi
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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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    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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# 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],
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[AC_HELP_STRING([--with-ffi-includes=ARG],
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  [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"
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    LIBFFI_CFLAGS="-I$withval"
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 fi
])

AC_SUBST(FFIIncludeDir)

AC_ARG_WITH([ffi-libraries],
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[AC_HELP_STRING([--with-ffi-libraries=ARG],
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  [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 $LDFLAGS"
 AC_CHECK_LIB(ffi, ffi_call,
  [AC_CHECK_HEADERS([ffi.h], [break], [])
   AC_DEFINE([HAVE_LIBFFI], [1], [Define to 1 if you have libffi.])],
  [AC_MSG_ERROR([Cannot find system libffi])])
 CFLAGS="$CFLAGS2"
 LDFLAGS="$LDFLAGS2"
])

FP_ICONV
FP_GMP

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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 "$target" != "$host" ; 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
if test "$build" != "$host" ; then
   AC_MSG_ERROR([
You've selected:

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  BUILD:  $build   (the architecture we're building on)
  HOST:   $host    (the architecture the compiler we're building will execute on)
  TARGET: $target  (the architecture the compiler we're building will produce code for)
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BUILD must equal HOST; that is, we do not support building GHC itself
with a cross-compiler.  To cross-compile GHC itself, set TARGET: stage
1 will be a cross-compiler, and stage 2 will be the cross-compiled
GHC.
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])
fi
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if test "$CrossCompiling" = "YES"
then
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  CrossCompilePrefix="${target}-"
else
  CrossCompilePrefix=""
fi
TargetPlatformFull="${target}"
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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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# --with-hs-cpp/--with-hs-cpp-flags
FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
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dnl ** Which ld to use?
dnl --------------------------------------------------------------
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FP_ARG_WITH_PATH_GNU_PROG([LD], [ld], [ld])
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LdCmd="$LD"
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 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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dnl ** Which LLVM llc to use?
dnl --------------------------------------------------------------
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FIND_LLVM_PROG([LLC], [llc], [llc])
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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])
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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 ** 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 ** 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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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 ** 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 DocBook toolchain
FP_CHECK_DOCBOOK_DTD
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FP_DOCBOOK_XSL
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FP_PROG_DBLATEX

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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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dnl ** check whether we need -ldl to get dlopen()
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AC_CHECK_LIB(dl, dlopen)
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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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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 ** 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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  ])


dnl ** checking for PAPI
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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, Cabal/Cabal)
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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 settings docs/users_guide/ug-book.xml docs/users_guide/ug-ent.xml docs/index.html libraries/prologue.txt distrib/configure.ac])
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AC_OUTPUT
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# We got caught by
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#     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
"]

echo ["\
   Bootstrapping using   : $WithGhc
      which is version   : $GhcVersion
"]

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if test "x$CC_LLVM_BACKEND" = "x1"; then
    if test "x$CC_CLANG_BACKEND" = "x1"; then
        CompilerName="clang        "
    else
        CompilerName="llvm-gcc     "
    fi
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else
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    CompilerName="gcc          "
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fi

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echo ["\
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   Using $CompilerName       : $WhatGccIsCalled
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      which is version       : $GccVersion
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   Building a cross compiler : $CrossCompiling
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   cpp       : $HaskellCPPCmd
   cpp-flags : $HaskellCPPArgs
   ld        : $LdCmd
   Happy     : $HappyCmd ($HappyVersion)
   Alex      : $AlexCmd ($AlexVersion)
   Perl      : $PerlCmd
   dblatex   : $DblatexCmd
   xsltproc  : $XsltprocCmd
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   Using LLVM tools
      llc   : $LlcCmd
      opt   : $OptCmd"]
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if test "$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
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   http://ghc.haskell.org/trac/ghc/wiki/Building
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"