File: configure.ac

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dnl == autoconf source for the Glasgow FP tools ==
dnl (run "grep '^dnl \*' configure.ac | sed -e 's/dnl / /g; s/\*\*/   +/g;'"
dnl  (or some such) to see the outline of this file)
dnl
#
# (c) The University of Glasgow 1994-2012
#
# Configure script template for GHC
#
# Process with 'autoreconf' to get a working configure script.
#
# For the generated configure script, do "./configure --help" to
# see what flags are available. (Better yet, read the documentation!)
#

AC_INIT([The Glorious Glasgow Haskell Compilation System], [8.0.1], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])

# Set this to YES for a released version, otherwise NO
: ${RELEASE=YES}

# The primary version (e.g. 7.5, 7.4.1) is set in the AC_INIT line
# above.  If this is not a released version, then we will append the
# date to the version number (e.g. 7.4.20111220).  The date is
# constructed by finding the date of the most recent patch in the
# git repository.  If this is a source distribution (not a git
# checkout), then we ship a file 'VERSION' containing the full version
# when the source distribution was created.

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

AC_SUBST([CONFIGURE_ARGS], [$ac_configure_args])

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

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

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

# Hmmm, we fix the RPM release number to 1 here... Is this convenient?
AC_SUBST([release], [1])

# First off, a distrib sanity check..
AC_CONFIG_SRCDIR([mk/config.mk.in])

dnl * We require autoconf version 2.60
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.
dnl Using autoconf 2.59 started to give nonsense like this
dnl  #define SIZEOF_CHAR 0
dnl recently.
AC_PREREQ([2.60])

# -------------------------------------------------------------------------
# Prepare to generate the following header files
#
#
AC_CONFIG_HEADER(mk/config.h)

# No, semi-sadly, we don't do `--srcdir'...
if test x"$srcdir" != 'x.' ; then
    echo "This configuration does not support the \`--srcdir' option.."
    exit 1
fi

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 --------------------------------------------------------------

AC_ARG_WITH([ghc],
[AC_HELP_STRING([--with-ghc=ARG],
  [Use ARG as the path to GHC  [default=autodetect]])],
  [WithGhc="$withval"],
  [if test "$GHC" = ""; then
    AC_PATH_PROG([GHC], [ghc])
  fi
  WithGhc="$GHC"])

dnl ** Tell the make system which OS we are using
dnl $OSTYPE is set by the operating system to "msys" or "cygwin" or something
AC_SUBST(OSTYPE)

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
)

AC_ARG_ENABLE(tarballs-autodownload,
[AC_HELP_STRING([--enable-tarballs-autodownload],
                [Automatically download Windows distribution binaries if needed.])],
        TarballsAutodownload=YES,
        TarballsAutodownload=NO
)
if test "$WithGhc" != ""; then
  FPTOOLS_GHC_VERSION([GhcVersion], [GhcMajVersion], [GhcMinVersion], [GhcPatchLevel])dnl

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

  AC_SUBST(GhcVersion)dnl
  AC_SUBST(GhcMajVersion)dnl
  AC_SUBST(GhcMinVersion)dnl
  AC_SUBST(GhcPatchLevel)dnl
  GhcMinVersion2=`echo "$GhcMinVersion" | sed 's/^\\(.\\)$/0\\1/'`
  GhcCanonVersion="$GhcMajVersion$GhcMinVersion2"

  BOOTSTRAPPING_GHC_INFO_FIELD([CC_STAGE0],[C compiler command])
  BOOTSTRAPPING_GHC_INFO_FIELD([LD_STAGE0],[ld command])
  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])
fi

dnl ** Must have GHC to build GHC
if test "$WithGhc" = ""
then
    AC_MSG_ERROR([GHC is required.])
fi
FP_COMPARE_VERSIONS([$GhcVersion],[-lt],[7.8],
    [AC_MSG_ERROR([GHC version 7.8 or later is required to compile GHC.])])

if test `expr $GhcMinVersion % 2` = "1"
then
    if test "$EnableBootstrapWithDevelSnaphost" = "NO"
    then
        AC_MSG_ERROR([
     $WithGhc is a development snapshot of GHC, version $GhcVersion.
     Bootstrapping using this version of GHC is not supported, and may not
     work.  Use --enable-bootstrap-with-devel-snapshot to try it anyway,
     or --with-ghc to specify a different GHC to use.])
    fi
fi

GHC_PACKAGE_DB_FLAG=package-db
AC_SUBST(GHC_PACKAGE_DB_FLAG)

# 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)

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

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

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

    if test "$ghc_host_os" = "mingw32"
    then
        if test "${OSTYPE}" = "msys"
        then
            WithGhc=`echo "${WithGhc}" | sed "s#^/\([a-zA-Z]\)/#\1:/#"`
        else
            # Canonicalise to <drive>:/path/to/ghc
            WithGhc=`cygpath -m "${WithGhc}"`
        fi
        echo "GHC path canonicalised to: ${WithGhc}"
    fi
fi
AC_SUBST([WithGhc])

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

dnl--------------------------------------------------------------------
dnl * Choose host(/target/build) platform
dnl--------------------------------------------------------------------
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

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

FPTOOLS_SET_PLATFORM_VARS

# Verify that the installed (bootstrap) GHC is capable of generating
# code for the requested build platform.
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

# Testing if we shall enable shared libs support on Solaris.
# Anything older than SunOS 5.11 aka Solaris 11 (Express) is broken.

SOLARIS_BROKEN_SHLD=NO

case $host in
     i386-*-solaris2)
     # here we go with the test
     MINOR=`uname -r|cut -d '.' -f 2-`
     if test "$MINOR" -lt "11"; then
         SOLARIS_BROKEN_SHLD=YES
     fi
     ;;
esac

AC_SUBST(SOLARIS_BROKEN_SHLD)

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

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)

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

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


if test "$HostOS" = "mingw32"
then
    # Find the mingw-w64 7z file to extract.
    # NB. If you update the tarballs to a new version of gcc, don't
    # forget to tweak the paths in driver/gcc/gcc.c.
    if test "$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

set_up_tarballs() {
    AC_MSG_NOTICE([Checking for Windows toolchain tarballs...])
    local action
    if test "$TarballsAutodownload" = "NO"
    then
        action="verify"
    else
        action="download"
    fi
    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

    # 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
        local base_dir="../ghc-tarballs/${tarball_dest_dir}"
        ( cd inplace &&
        find "${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

    mingwbin="$hardtop/inplace/mingw/bin/"
    CC="${mingwbin}gcc.exe"
    LD="${mingwbin}ld.exe"
    NM="${mingwbin}nm.exe"
    RANLIB="${mingwbin}ranlib.exe"
    OBJDUMP="${mingwbin}objdump.exe"
    fp_prog_ar="${mingwbin}ar.exe"

    # NB. Download the perl binaries if required
    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
fi

FP_ICONV
FP_GMP
FP_CURSES

XCODE_VERSION()

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 "$XCodeVersion1" -eq 3
        then
            if test "$XCodeVersion2" -lt 2
            then
                SplitObjsBroken=YES
            fi
        fi
    fi
fi
AC_SUBST([SplitObjsBroken])

dnl ** Building a cross compiler?
dnl --------------------------------------------------------------
CrossCompiling=NO
# If 'host' and 'target' differ, then this means we are building a cross-compiler.
if test "$target" != "$host" ; then
    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:

  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)

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.
])
fi
if test "$CrossCompiling" = "YES"
then
  CrossCompilePrefix="${target}-"
else
  CrossCompilePrefix=""
fi
TargetPlatformFull="${target}"
AC_SUBST(CrossCompiling)
AC_SUBST(CrossCompilePrefix)
AC_SUBST(TargetPlatformFull)

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

# 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])

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

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

# --with-hs-cpp/--with-hs-cpp-flags
FP_CPP_CMD_WITH_ARGS(HaskellCPPCmd, HaskellCPPArgs)
AC_SUBST([HaskellCPPCmd])
AC_SUBST([HaskellCPPArgs])

dnl ** Which ld to use?
dnl --------------------------------------------------------------
FIND_LD([LdCmd])
AC_SUBST([LdCmd])

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

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

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"


# 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

# 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.
LlvmVersion=3.7
AC_SUBST([LlvmVersion])
sUPPORTED_LLVM_VERSION=$(echo \($LlvmVersion\) | sed 's/\./,/')
AC_DEFINE_UNQUOTED([sUPPORTED_LLVM_VERSION], ${sUPPORTED_LLVM_VERSION}, [The supported LLVM version number])

dnl ** Which LLVM llc to use?
dnl --------------------------------------------------------------
FIND_LLVM_PROG([LLC], [llc], [llc], [$LlvmVersion])
LlcCmd="$LLC"
AC_SUBST([LlcCmd])

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

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


dnl --------------------------------------------------------------
dnl * General configuration checks
dnl --------------------------------------------------------------

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.

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"
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
    "${WithGhc}" -pgmlc="${BootstrapLlcCmd}" -pgmlo="${BootstrapOptCmd}" conftestghc.hs 2>&1 >/dev/null
    res=`./conftestghc`
    if test "x$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
    "${WithGhc}" -fforce-recomp -pgmlc="${BootstrapLlcCmd}" -pgmlo="${BootstrapOptCmd}" -fllvm conftestghc.hs 2>&1 >/dev/null
    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
fi
AC_SUBST([GHC_LLVM_AFFECTED_BY_9439])

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

if test "$TargetOS" = "mingw32"
then
    GhcLibsWithUnix=NO
else
    GhcLibsWithUnix=YES
fi
AC_SUBST([GhcLibsWithUnix])

dnl ** does #! work?
AC_SYS_INTERPRETER()

dnl ** look for `perl'
case $HostOS_CPP in
cygwin32|mingw32)
    PerlCmd=$hardtop/inplace/perl/perl
    ;;
*)
    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
    ;;
esac

dnl ** look for GCC and find out which version
dnl     Figure out which C compiler to use.  Gcc is preferred.
dnl     If gcc, make sure it's at least 3.0
dnl
FP_GCC_VERSION

dnl ** See whether gcc supports -no-pie
FP_GCC_SUPPORTS_NO_PIE

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

FP_PROG_LD_IS_GNU
FP_PROG_LD_BUILD_ID
FP_PROG_LD_NO_COMPACT_UNWIND
FP_PROG_LD_FILELIST


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])
# Stage 3 won't be supported by cross-compilation

FP_GCC_EXTRA_FLAGS

AC_SUBST(CONF_CC_OPTS_STAGE0)
AC_SUBST(CONF_CC_OPTS_STAGE1)
AC_SUBST(CONF_CC_OPTS_STAGE2)
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)
AC_SUBST(CONF_CPP_OPTS_STAGE0)
AC_SUBST(CONF_CPP_OPTS_STAGE1)
AC_SUBST(CONF_CPP_OPTS_STAGE2)

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

dnl ** figure out how to do context diffs
FP_PROG_CONTEXT_DIFF

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
dnl ** figure out how to do a BSD-ish install
AC_PROG_INSTALL

dnl ** how to invoke `ar' and `ranlib'
FP_PROG_AR_SUPPORTS_ATFILE
FP_PROG_AR_NEEDS_RANLIB

dnl ** Check to see whether ln -s works
AC_PROG_LN_S

FP_SETTINGS

dnl ** Find the path to sed
AC_PATH_PROGS(SedCmd,gsed sed,sed)


dnl ** check for time command
AC_PATH_PROG(TimeCmd,time)

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

dnl ** check for patch
dnl if GNU patch is named gpatch, look for it first
AC_PATH_PROGS(PatchCmd,gpatch patch, patch)

dnl ** check for dtrace (currently only implemented for Mac OS X)
HaveDtrace=NO
AC_PATH_PROG(DtraceCmd,dtrace)
if test -n "$DtraceCmd"; then
  if test "x$TargetOS_CPP-$TargetVendor_CPP" = "xdarwin-apple" -o "x$TargetOS_CPP-$TargetVendor_CPP" = "xsolaris2-unknown"; then
    HaveDtrace=YES
  fi
fi
AC_SUBST(HaveDtrace)

AC_PATH_PROG(HSCOLOUR,HsColour)
# HsColour is passed to Cabal, so we need a native path
if test "$HostOS"      = "mingw32" && \
   test "${OSTYPE}"   != "msys"    && \
   test "${HSCOLOUR}" != ""
then
    # Canonicalise to <drive>:/path/to/gcc
    HSCOLOUR=`cygpath -m ${HSCOLOUR}`
fi

dnl ** check for Sphinx toolchain
AC_PATH_PROG(SPHINXBUILD,sphinx-build)
AC_CACHE_CHECK([for version of sphinx-build], fp_cv_sphinx_version,
changequote(, )dnl
[if test -n "$SPHINXBUILD"; then
  fp_cv_sphinx_version=`"$SPHINXBUILD" --version 2>&1 | sed 's/Sphinx\( (sphinx-build)\)\? v\?\([0-9]\.[0-9]\.[0-9]\)/\2/' | head -n1`;
fi;
changequote([, ])dnl
])
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=;])

dnl ** check for xelatex
AC_PATH_PROG(XELATEX,xelatex)

dnl ** check for ghc-pkg command
FP_PROG_GHC_PKG

dnl ** check for installed happy binary + version
FPTOOLS_HAPPY

dnl ** check for installed alex binary + version
FPTOOLS_ALEX

dnl --------------------------------------------------
dnl ### program checking section ends here ###
dnl --------------------------------------------------

dnl --------------------------------------------------
dnl * Platform header file and syscall feature tests
dnl ### checking the state of the local header files and syscalls ###

dnl ** check for full ANSI header (.h) files
AC_HEADER_STDC

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

dnl ** check for specific header (.h) files that we are interested in
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])

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
]])

dnl ** check if it is safe to include both <time.h> and <sys/time.h>
AC_HEADER_TIME

dnl ** do we have long longs?
AC_CHECK_TYPES([long long])

dnl ** what are the sizes of various types
AC_CHECK_SIZEOF(char,               1)
AC_CHECK_SIZEOF(double,             8)
AC_CHECK_SIZEOF(float,              4)
AC_CHECK_SIZEOF(int,                4)
AC_CHECK_SIZEOF(long,               4)
if test "$ac_cv_type_long_long" = yes; then
AC_CHECK_SIZEOF(long long,          8)
fi
AC_CHECK_SIZEOF(short,              2)
AC_CHECK_SIZEOF(unsigned char,      1)
AC_CHECK_SIZEOF(unsigned int,       4)
AC_CHECK_SIZEOF(unsigned long,      4)
if test "$ac_cv_type_long_long" = yes; then
AC_CHECK_SIZEOF(unsigned long long, 8)
fi
AC_CHECK_SIZEOF(unsigned short,     2)
AC_CHECK_SIZEOF(void *,             4)

dnl for use in settings.in
WordSize=$ac_cv_sizeof_void_p
AC_SUBST(WordSize)

dnl ** what are alignment constraints on various types
FP_CHECK_ALIGNMENT(char)
FP_CHECK_ALIGNMENT(double)
FP_CHECK_ALIGNMENT(float)
FP_CHECK_ALIGNMENT(int)
FP_CHECK_ALIGNMENT(long)
if test "$ac_cv_type_long_long" = yes; then
FP_CHECK_ALIGNMENT(long long)
fi
FP_CHECK_ALIGNMENT(short)
FP_CHECK_ALIGNMENT(unsigned char)
FP_CHECK_ALIGNMENT(unsigned int)
FP_CHECK_ALIGNMENT(unsigned long)
if test "$ac_cv_type_long_long" = yes; then
FP_CHECK_ALIGNMENT(unsigned long long)
fi
FP_CHECK_ALIGNMENT(unsigned short)
FP_CHECK_ALIGNMENT(void *)

FP_CHECK_FUNC([WinExec],
  [@%:@include <windows.h>], [WinExec("",0)])

FP_CHECK_FUNC([GetModuleFileName],
  [@%:@include <windows.h>], [GetModuleFileName((HMODULE)0,(LPTSTR)0,0)])

dnl ** check for more functions
dnl ** The following have been verified to be used in ghc/, but might be used somewhere else, too.
AC_CHECK_FUNCS([getclock getrusage gettimeofday setitimer siginterrupt sysconf times ctime_r sched_setaffinity setlocale])

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>])

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

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

dnl ** check for math library
dnl    Keep that check as early as possible.
dnl    as we need to know whether we need libm
dnl    for math functions or not
dnl    (see http://ghc.haskell.org/trac/ghc/ticket/3730)
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

FP_BFD_SUPPORT

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

# 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 $LDFLAGS"
 if test "$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="$LDFLAGS -lpthread"
 fi
 AC_CHECK_LIB(ffi, ffi_call,
  [AC_CHECK_HEADERS([ffi.h], [break], [])
   AC_DEFINE([HAVE_LIBFFI], [1], [Define to 1 if you have libffi.])],
  [AC_MSG_ERROR([Cannot find system libffi])])
 CFLAGS="$CFLAGS2"
 LDFLAGS="$LDFLAGS2"
])

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

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

dnl ** can we get alloca?
AC_FUNC_ALLOCA

dnl ** working vfork?
AC_FUNC_FORK

dnl ** determine whether or not const works
AC_C_CONST

dnl ** are we big endian?
AC_C_BIGENDIAN
FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN

dnl ** check for leading underscores in symbol names
FP_LEADING_UNDERSCORE

FP_VISIBILITY_HIDDEN

dnl ** check for librt
AC_CHECK_LIB(rt, clock_gettime)
AC_CHECK_FUNCS(clock_gettime timer_settime)
FP_CHECK_TIMER_CREATE

dnl ** check for Apple's "interesting" long double compatibility scheme
AC_MSG_CHECKING(for printf\$LDBLStub)
AC_TRY_LINK_FUNC(printf\$LDBLStub,
    [
        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).])
    ])

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)
)

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

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)
   AC_DEFINE([CC_SUPPORTS_TLS],[1],[Define to 1 if __thread is supported])
  ],
  [
   AC_MSG_RESULT(no)
   AC_DEFINE([CC_SUPPORTS_TLS],[0],[Define to 1 if __thread is supported])
  ])

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

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
)

use_large_address_space=no
if test "$ac_cv_sizeof_void_p" -eq 8 ; then
    if test "x$EnableLargeAddressSpace" = "xyes" ; then
        if test "$ghc_host_os" = "darwin" ; then
            use_large_address_space=yes
	elif test "$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
        else
            AC_CHECK_DECLS([MAP_NORESERVE, MADV_FREE, MADV_DONTNEED],[],[],
                [
                #include <unistd.h>
                #include <sys/types.h>
                #include <sys/mman.h>
                #include <fcntl.h>
            ])
            if test "$ac_cv_have_decl_MAP_NORESERVE" = "yes" &&
                test "$ac_cv_have_decl_MADV_FREE" = "yes" ||
                test "$ac_cv_have_decl_MADV_DONTNEED" = "yes" ; then
                    use_large_address_space=yes
            fi
        fi
    fi
fi
if test "$use_large_address_space" = "yes" ; then
   AC_DEFINE([USE_LARGE_ADDRESS_SPACE], [1], [Enable single heap address space support])
fi

dnl ** Have libdw?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(libdw,
    [AC_HELP_STRING([--enable-dwarf-unwind],
        [Enable DWARF unwinding support in the runtime system via elfutils' libdw [default=no]])],
    [AC_CHECK_LIB(dw, dwfl_attach_state, [HaveLibdw=YES], [HaveLibdw=NO])],
    [HaveLibdw=NO]
)
AC_SUBST(HaveLibdw)

if test -n "$SPHINXBUILD"; then
    BUILD_MAN=YES
    BUILD_SPHINX_HTML=YES
    if test -n "$XELATEX"; then
        BUILD_SPHINX_PDF=YES
    else
        BUILD_SPHINX_PDF=NO
    fi
else
    BUILD_MAN=NO
    BUILD_SPHINX_HTML=NO
    BUILD_SPHINX_PDF=NO
fi
AC_SUBST(BUILD_MAN)
AC_SUBST(BUILD_SPHINX_HTML)
AC_SUBST(BUILD_SPHINX_PDF)

LIBRARY_VERSION(base)
LIBRARY_VERSION(Cabal, Cabal/Cabal)
LIBRARY_VERSION(ghc-prim)
LIBRARY_ghc_VERSION="$ProjectVersion"
AC_SUBST(LIBRARY_ghc_VERSION)

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

# Create the configuration for the Shake-based build system if it is present
if test -e shake-build/cfg/system.config.in; then
    AC_CONFIG_FILES([shake-build/cfg/system.config])
fi

# We got caught by
#     http://savannah.gnu.org/bugs/index.php?1516
#     $(eval ...) inside conditionals causes errors
# with make 3.80, so warn the user if it looks like they're about to
# try to use it.
# We would use "grep -q" here, but Solaris's grep doesn't support it.
print_make_warning=""
checkMake380() {
    make_ver=`$1 --version 2>&1 | head -1`
    if echo "$make_ver" | grep 'GNU Make 3\.80' > /dev/null
    then
        print_make_warning="true"
    fi
    if echo "$make_ver" | grep 'GNU Make' > /dev/null
    then
        MakeCmd=$1
        AC_SUBST(MakeCmd)
    fi
}

checkMake380 make
checkMake380 gmake

AC_CONFIG_FILES([mk/config.mk mk/install.mk mk/project.mk compiler/ghc.cabal ghc/ghc-bin.cabal utils/runghc/runghc.cabal libraries/ghc-boot/ghc-boot.cabal libraries/ghc-boot-th/ghc-boot-th.cabal libraries/ghci/ghci.cabal settings docs/users_guide/ghc_config.py docs/index.html libraries/prologue.txt distrib/configure.ac])
AC_OUTPUT

if test "$print_make_warning" = "true"; then
   echo
   echo "WARNING: It looks like \"$MakeCmd\" is GNU make 3.80."
   echo "This version cannot be used to build GHC."
   echo "Please use GNU make >= 3.81."
fi

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

   Building GHC version  : $ProjectVersion
          Git commit id  : $ProjectGitCommitId

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

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

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

echo ["\
   Using $CompilerName       : $WhatGccIsCalled
      which is version       : $GccVersion
   Building a cross compiler : $CrossCompiling
   hs-cpp       : $HaskellCPPCmd
   hs-cpp-flags : $HaskellCPPArgs
   ld           : $LdCmd
   nm           : $NmCmd
   objdump      : $ObjdumpCmd
   Happy        : $HappyCmd ($HappyVersion)
   Alex         : $AlexCmd ($AlexVersion)
   Perl         : $PerlCmd
   sphinx-build : $SPHINXBUILD
   xelatex      : $XELATEX

   Using LLVM tools
      llc   : $LlcCmd
      opt   : $OptCmd"]

if test "$HSCOLOUR" = ""; then
echo ["
   HsColour was not found; documentation will not contain source links
"]
else
echo ["\
   HsColour : $HSCOLOUR
"]
fi

echo ["\
   Tools to build Sphinx HTML documentation available: $BUILD_SPHINX_HTML
   Tools to build Sphinx PDF documentation available: $BUILD_SPHINX_PDF"]

echo ["----------------------------------------------------------------------
"]

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

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

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