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# Extra autoconf macros for the Glasgow fptools
#
# To be a good autoconf citizen, names of local macros have prefixed with FP_ to
# ensure we don't clash with any pre-supplied autoconf ones.
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AC_DEFUN([GHC_SELECT_FILE_EXTENSIONS],
[
    $2=''
    $3='.so'
    case $1 in
    *-unknown-cygwin32)
        AC_MSG_WARN([GHC does not support the Cygwin target at the moment])
        AC_MSG_WARN([I'm assuming you wanted to build for i386-unknown-mingw32])
        exit 1
        ;;
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    # examples: i386-unknown-mingw32, i686-w64-mingw32, x86_64-w64-mingw32
    *-mingw32)
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        windows=YES
        $2='.exe'
        $3='.dll'
        ;;
    i386-apple-darwin|powerpc-apple-darwin)
        $3='.dylib'
        ;;
    x86_64-apple-darwin)
        $3='.dylib'
        ;;
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    arm-apple-darwin10|i386-apple-darwin11|aarch64-apple-darwin14|x86_64-apple-darwin14)
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        $2='.a'
        $3='.dylib'
        ;;
    esac
])

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# FPTOOLS_SET_PLATFORM_VARS
# ----------------------------------
# Set the platform variables
AC_DEFUN([FPTOOLS_SET_PLATFORM_VARS],
[
    # If no argument was given for a configuration variable, then discard
    # the guessed canonical system and use the configuration of the
    # bootstrapping ghc. If an argument was given, map it from gnu format
    # to ghc format.
    #
    # For why we do it this way, see: #3637, #1717, #2951
    #
    # In bindists, we haven't called AC_CANONICAL_{BUILD,HOST,TARGET}
    # so this justs uses $bootstrap_target.

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

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

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

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

    if test "$target_alias" = ""
    then
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        if test "$host_alias" != ""
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        then
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            GHC_CONVERT_CPU([$host_cpu], [TargetArch])
            GHC_CONVERT_VENDOR([$host_vendor], [TargetVendor])
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            GHC_CONVERT_OS([$host_os], [$TargetArch],[TargetOS])
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        else
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            if test "$bootstrap_target" != ""
            then
                target=$bootstrap_target
                echo "Target platform inferred as: $target"
            else
                echo "Can't work out target platform"
                exit 1
            fi
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            TargetArch=`echo "$target" | sed 's/-.*//'`
            TargetVendor=`echo "$target" | sed -e 's/.*-\(.*\)-.*/\1/'`
            TargetOS=`echo "$target" | sed 's/.*-//'`
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        fi
    else
        GHC_CONVERT_CPU([$target_cpu], [TargetArch])
        GHC_CONVERT_VENDOR([$target_vendor], [TargetVendor])
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        GHC_CONVERT_OS([$target_os], [$TargetArch], [TargetOS])
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    fi
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    GHC_SELECT_FILE_EXTENSIONS([$host], [exeext_host], [soext_host])
    GHC_SELECT_FILE_EXTENSIONS([$target], [exeext_target], [soext_target])
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    windows=NO
    case $host in
    *-unknown-mingw32)
        windows=YES
        ;;
    esac
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    BuildPlatform="$BuildArch-$BuildVendor-$BuildOS"
    BuildPlatform_CPP=`echo "$BuildPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
    BuildArch_CPP=`    echo "$BuildArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
    BuildVendor_CPP=`  echo "$BuildVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
    BuildOS_CPP=`      echo "$BuildOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`

    HostPlatform="$HostArch-$HostVendor-$HostOS"
    HostPlatform_CPP=`echo "$HostPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
    HostArch_CPP=`    echo "$HostArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
    HostVendor_CPP=`  echo "$HostVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
    HostOS_CPP=`      echo "$HostOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`

    TargetPlatform="$TargetArch-$TargetVendor-$TargetOS"
    TargetPlatform_CPP=`echo "$TargetPlatform" | sed -e 's/\./_/g' -e 's/-/_/g'`
    TargetArch_CPP=`    echo "$TargetArch"     | sed -e 's/\./_/g' -e 's/-/_/g'`
    TargetVendor_CPP=`  echo "$TargetVendor"   | sed -e 's/\./_/g' -e 's/-/_/g'`
    TargetOS_CPP=`      echo "$TargetOS"       | sed -e 's/\./_/g' -e 's/-/_/g'`

    echo "GHC build  : $BuildPlatform"
    echo "GHC host   : $HostPlatform"
    echo "GHC target : $TargetPlatform"

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

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

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

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

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    AC_SUBST(exeext_host)
    AC_SUBST(exeext_target)
    AC_SUBST(soext_host)
    AC_SUBST(soext_target)
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])


# FPTOOLS_SET_HASKELL_PLATFORM_VARS
# ----------------------------------
# Set the Haskell platform variables
AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS],
[
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    checkArch() {
        case [$]1 in
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        i386)
            test -z "[$]2" || eval "[$]2=ArchX86"
            ;;
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        x86_64|amd64)
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            test -z "[$]2" || eval "[$]2=ArchX86_64"
            ;;
        powerpc)
            test -z "[$]2" || eval "[$]2=ArchPPC"
            ;;
        powerpc64)
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            test -z "[$]2" || eval "[$]2=\"ArchPPC_64 {ppc_64ABI = ELF_V1}\""
            ;;
        powerpc64le)
            test -z "[$]2" || eval "[$]2=\"ArchPPC_64 {ppc_64ABI = ELF_V2}\""
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            ;;
        sparc)
            test -z "[$]2" || eval "[$]2=ArchSPARC"
            ;;
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        sparc64)
            test -z "[$]2" || eval "[$]2=ArchSPARC64"
            ;;
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        arm)
            GET_ARM_ISA()
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            test -z "[$]2" || eval "[$]2=\"ArchARM {armISA = \$ARM_ISA, armISAExt = \$ARM_ISA_EXT, armABI = \$ARM_ABI}\""
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            ;;
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        aarch64)
            test -z "[$]2" || eval "[$]2=ArchARM64"
            ;;
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        alpha)
            test -z "[$]2" || eval "[$]2=ArchAlpha"
            ;;
        mips|mipseb)
            test -z "[$]2" || eval "[$]2=ArchMipseb"
            ;;
        mipsel)
            test -z "[$]2" || eval "[$]2=ArchMipsel"
            ;;
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        hppa|hppa1_1|ia64|m68k|rs6000|s390|s390x|sh4|vax)
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            test -z "[$]2" || eval "[$]2=ArchUnknown"
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            ;;
        *)
            echo "Unknown arch [$]1"
            exit 1
            ;;
        esac
    }

    checkVendor() {
        case [$]1 in
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        dec|none|unknown|hp|apple|next|sun|sgi|ibm|montavista|portbld)
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            ;;
        *)
            echo "Unknown vendor [$]1"
            exit 1
            ;;
        esac
    }

    checkOS() {
        case [$]1 in
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        linux)
            test -z "[$]2" || eval "[$]2=OSLinux"
            ;;
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        ios)
            test -z "[$]2" || eval "[$]2=OSiOS"
            ;;
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        darwin)
            test -z "[$]2" || eval "[$]2=OSDarwin"
            ;;
        solaris2)
            test -z "[$]2" || eval "[$]2=OSSolaris2"
            ;;
        mingw32)
            test -z "[$]2" || eval "[$]2=OSMinGW32"
            ;;
        freebsd)
            test -z "[$]2" || eval "[$]2=OSFreeBSD"
            ;;
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        dragonfly)
            test -z "[$]2" || eval "[$]2=OSDragonFly"
            ;;
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        kfreebsdgnu)
            test -z "[$]2" || eval "[$]2=OSKFreeBSD"
            ;;
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        openbsd)
            test -z "[$]2" || eval "[$]2=OSOpenBSD"
            ;;
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        netbsd)
            test -z "[$]2" || eval "[$]2=OSNetBSD"
            ;;
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        haiku)
            test -z "[$]2" || eval "[$]2=OSHaiku"
            ;;
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        nto-qnx)
            test -z "[$]2" || eval "[$]2=OSQNXNTO"
            ;;
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        dragonfly|hpux|linuxaout|freebsd2|gnu|nextstep2|nextstep3|sunos4|ultrix)
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            test -z "[$]2" || eval "[$]2=OSUnknown"
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            ;;
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        aix)
            test -z "[$]2" || eval "[$]2=OSAIX"
            ;;
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        linux-android)
            test -z "[$]2" || eval "[$]2=OSAndroid"
            ;;
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        *)
            echo "Unknown OS '[$]1'"
            exit 1
            ;;
        esac
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    }
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    dnl ** check for Apple-style dead-stripping support
    dnl    (.subsections-via-symbols assembler directive)

    AC_MSG_CHECKING(for .subsections_via_symbols)
    AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([], [__asm__ (".subsections_via_symbols");])],
        [AC_MSG_RESULT(yes)
         HaskellHaveSubsectionsViaSymbols=True
         AC_DEFINE([HAVE_SUBSECTIONS_VIA_SYMBOLS],[1],
                   [Define to 1 if Apple-style dead-stripping is supported.])
        ],
        [HaskellHaveSubsectionsViaSymbols=False
         AC_MSG_RESULT(no)])

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    dnl ** check for .ident assembler directive

    AC_MSG_CHECKING(whether your assembler supports .ident directive)
    AC_COMPILE_IFELSE(
        [AC_LANG_SOURCE([__asm__ (".ident \"GHC x.y.z\"");])],
        [AC_MSG_RESULT(yes)
         HaskellHaveIdentDirective=True],
        [AC_MSG_RESULT(no)
         HaskellHaveIdentDirective=False])

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    dnl *** check for GNU non-executable stack note support (ELF only)
    dnl     (.section .note.GNU-stack,"",@progbits)

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

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    checkArch "$BuildArch" "HaskellBuildArch"
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    checkVendor "$BuildVendor"
    checkOS "$BuildOS" ""

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    checkArch "$HostArch" "HaskellHostArch"
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    checkVendor "$HostVendor"
    checkOS "$HostOS" ""

    checkArch "$TargetArch" "HaskellTargetArch"
    checkVendor "$TargetVendor"
    checkOS "$TargetOS" "HaskellTargetOs"

    AC_SUBST(HaskellTargetArch)
    AC_SUBST(HaskellTargetOs)
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    AC_SUBST(HaskellHaveSubsectionsViaSymbols)
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    AC_SUBST(HaskellHaveIdentDirective)
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    AC_SUBST(HaskellHaveGnuNonexecStack)
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])


# GET_ARM_ISA
# ----------------------------------
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# Get info about the ISA on the ARM arch
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AC_DEFUN([GET_ARM_ISA],
[
    AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM(
            [],
            [#if defined(__ARM_ARCH_2__)  || \
                 defined(__ARM_ARCH_3__)  || \
                 defined(__ARM_ARCH_3M__) || \
                 defined(__ARM_ARCH_4__)  || \
                 defined(__ARM_ARCH_4T__) || \
                 defined(__ARM_ARCH_5__)  || \
                 defined(__ARM_ARCH_5T__) || \
                 defined(__ARM_ARCH_5E__) || \
                 defined(__ARM_ARCH_5TE__)
                 return 0;
             #else
                 not pre arm v6
             #endif]
        )],
        [AC_DEFINE(arm_HOST_ARCH_PRE_ARMv6, 1, [ARM pre v6])
         AC_DEFINE(arm_HOST_ARCH_PRE_ARMv7, 1, [ARM pre v7])
         changequote(, )dnl
         ARM_ISA=ARMv5
         ARM_ISA_EXT="[]"
         changequote([, ])dnl
        ],
        [
            AC_COMPILE_IFELSE([
                AC_LANG_PROGRAM(
                    [],
                    [#if defined(__ARM_ARCH_6__)   || \
                         defined(__ARM_ARCH_6J__)  || \
                         defined(__ARM_ARCH_6T2__) || \
                         defined(__ARM_ARCH_6Z__)  || \
                         defined(__ARM_ARCH_6ZK__) || \
                         defined(__ARM_ARCH_6M__)
                         return 0;
                     #else
                         not pre arm v7
                     #endif]
                )],
                [AC_DEFINE(arm_HOST_ARCH_PRE_ARMv7, 1, [ARM pre v7])
                 ARM_ISA=ARMv6
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                 AC_COMPILE_IFELSE([
                        AC_LANG_PROGRAM(
                                [],
                                [#if defined(__VFP_FP__)
                                     return 0;
                                #else
                                     no vfp
                                #endif]
                        )],
                        [changequote(, )dnl
                         ARM_ISA_EXT="[VFPv2]"
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                         changequote([, ])dnl
                        ],
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                        [changequote(, )dnl
                         ARM_ISA_EXT="[]"
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                         changequote([, ])dnl
                        ]
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                )],
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                [changequote(, )dnl
                 ARM_ISA=ARMv7
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                 ARM_ISA_EXT="[VFPv3,NEON]"
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                 changequote([, ])dnl
                ])
        ])
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        AC_COMPILE_IFELSE(
               [AC_LANG_PROGRAM(
                       [],
                       [#if defined(__SOFTFP__)
                            return 0;
                       #else
                            not softfp
                       #endif]
               )],
               [changequote(, )dnl
                ARM_ABI="SOFT"
                changequote([, ])dnl
               ],
               [AC_COMPILE_IFELSE(
                    [AC_LANG_PROGRAM(
                       [],
                       [#if defined(__ARM_PCS_VFP)
                            return 0;
                       #else
                            no hard float ABI
                       #endif]
                    )],
                    [ARM_ABI="HARD"],
                    [ARM_ABI="SOFTFP"]
               )]
        )
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        AC_SUBST(ARM_ISA)
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])


# FP_SETTINGS
# ----------------------------------
# Set the variables used in the settings file
AC_DEFUN([FP_SETTINGS],
[
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    if test "$windows" = YES
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    then
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        mingw_bin_prefix=mingw/bin/
        SettingsCCompilerCommand="\$topdir/../${mingw_bin_prefix}gcc.exe"
        SettingsHaskellCPPCommand="\$topdir/../${mingw_bin_prefix}gcc.exe"
        SettingsHaskellCPPFlags="$HaskellCPPArgs"
        SettingsLdCommand="\$topdir/../${mingw_bin_prefix}ld.exe"
        SettingsArCommand="\$topdir/../${mingw_bin_prefix}ar.exe"
        SettingsPerlCommand='$topdir/../perl/perl.exe'
        SettingsDllWrapCommand="\$topdir/../${mingw_bin_prefix}dllwrap.exe"
        SettingsWindresCommand="\$topdir/../${mingw_bin_prefix}windres.exe"
        SettingsTouchCommand='$topdir/bin/touchy.exe'
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    else
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        SettingsCCompilerCommand="$CC"
        SettingsHaskellCPPCommand="$HaskellCPPCmd"
        SettingsHaskellCPPFlags="$HaskellCPPArgs"
        SettingsLdCommand="$LdCmd"
        SettingsArCommand="$ArCmd"
        SettingsPerlCommand="$PerlCmd"
        SettingsDllWrapCommand="/bin/false"
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        SettingsWindresCommand="/bin/false"
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        SettingsLibtoolCommand="libtool"
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        SettingsTouchCommand='touch'
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    fi
    if test -z "$LlcCmd"
    then
      SettingsLlcCommand="llc"
    else
      SettingsLlcCommand="$LlcCmd"
    fi
    if test -z "$OptCmd"
    then
      SettingsOptCommand="opt"
    else
      SettingsOptCommand="$OptCmd"
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    fi
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    SettingsCCompilerFlags="$CONF_CC_OPTS_STAGE2"
    SettingsCCompilerLinkFlags="$CONF_GCC_LINKER_OPTS_STAGE2"
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    SettingsCCompilerSupportsNoPie="$CONF_GCC_SUPPORTS_NO_PIE"
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    SettingsLdFlags="$CONF_LD_LINKER_OPTS_STAGE2"
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    AC_SUBST(SettingsCCompilerCommand)
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    AC_SUBST(SettingsHaskellCPPCommand)
    AC_SUBST(SettingsHaskellCPPFlags)
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    AC_SUBST(SettingsCCompilerFlags)
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    AC_SUBST(SettingsCCompilerLinkFlags)
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    AC_SUBST(SettingsCCompilerSupportsNoPie)
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    AC_SUBST(SettingsLdCommand)
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    AC_SUBST(SettingsLdFlags)
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    AC_SUBST(SettingsArCommand)
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    AC_SUBST(SettingsPerlCommand)
    AC_SUBST(SettingsDllWrapCommand)
    AC_SUBST(SettingsWindresCommand)
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    AC_SUBST(SettingsLibtoolCommand)
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    AC_SUBST(SettingsTouchCommand)
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    AC_SUBST(SettingsLlcCommand)
    AC_SUBST(SettingsOptCommand)
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])

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# Helper for cloning a shell variable's state
AC_DEFUN([FP_COPY_SHELLVAR],
[if test -n "${$1+set}"; then $2="$$1"; else unset $2; fi ])

# FP_SET_CFLAGS_C99
# ----------------------------------
# figure out which CFLAGS are needed to place the compiler into C99 mode
# $1 is name of CC variable (unmodified)
# $2 is name of CC flags variable (augmented if needed)
# $3 is name of CPP flags variable (augmented if needed)
AC_DEFUN([FP_SET_CFLAGS_C99],
[
    dnl save current state of AC_PROG_CC_C99
    FP_COPY_SHELLVAR([CC],[fp_save_CC])
    FP_COPY_SHELLVAR([CFLAGS],[fp_save_CFLAGS])
    FP_COPY_SHELLVAR([CPPFLAGS],[fp_save_CPPFLAGS])
    FP_COPY_SHELLVAR([ac_cv_prog_cc_c99],[fp_save_cc_c99])
    dnl set local state
    CC="$$1"
    CFLAGS="$$2"
    CPPFLAGS="$$3"
    unset ac_cv_prog_cc_c99
    dnl perform detection
    _AC_PROG_CC_C99
    fp_cc_c99="$ac_cv_prog_cc_c99"
    case "x$ac_cv_prog_cc_c99" in
      x)   ;; # noop
      xno) AC_MSG_ERROR([C99-compatible compiler needed]) ;;
      *)   $2="$$2 $ac_cv_prog_cc_c99"
           $3="$$3 $ac_cv_prog_cc_c99"
           ;;
    esac
    dnl restore saved state
    FP_COPY_SHELLVAR([fp_save_CC],[CC])
    FP_COPY_SHELLVAR([fp_save_CFLAGS],[CFLAGS])
    FP_COPY_SHELLVAR([fp_save_CPPFLAGS],[CPPFLAGS])
    FP_COPY_SHELLVAR([fp_save_cc_c99],[ac_cv_prog_cc_c99])
    dnl cleanup
    unset fp_save_CC
    unset fp_save_CFLAGS
    unset fp_save_cc_c99
])
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# FPTOOLS_SET_C_LD_FLAGS
# ----------------------------------
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# Set the C, LD and CPP flags for a given platform
# $1 is the platform
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# $2 is the name of the CC flags variable
# $3 is the name of the linker flags variable when linking with gcc
# $4 is the name of the linker flags variable when linking with ld
# $5 is the name of the CPP flags variable
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AC_DEFUN([FPTOOLS_SET_C_LD_FLAGS],
[
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    AC_MSG_CHECKING([Setting up $2, $3, $4 and $5])
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    case $$1 in
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    i386-*)
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        # Workaround for #7799
        $2="$$2 -U__i686"
        ;;
    esac

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    case $$1 in
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    i386-unknown-mingw32)
        $2="$$2 -march=i686"
        ;;
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    i386-portbld-freebsd*)
        $2="$$2 -march=i686"
        ;;
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    i386-apple-darwin)
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        $2="$$2 -m32"
        $3="$$3 -m32"
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        $4="$$4 -arch i386"
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        $5="$$5 -m32"
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        ;;
    x86_64-apple-darwin)
        $2="$$2 -m64"
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        $3="$$3 -m64"
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        $4="$$4 -arch x86_64"
        $5="$$5 -m64"
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        ;;
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    x86_64-unknown-solaris2)
        $2="$$2 -m64"
        $3="$$3 -m64"
        $4="$$4 -m64"
        $5="$$5 -m64"
        ;;
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    alpha-*)
        # For now, to suppress the gcc warning "call-clobbered
        # register used for global register variable", we simply
        # disable all warnings altogether using the -w flag. Oh well.
        $2="$$2 -w -mieee -D_REENTRANT"
        $3="$$3 -w -mieee -D_REENTRANT"
        $5="$$5 -w -mieee -D_REENTRANT"
        ;;
    hppa*)
        # ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
        # (very nice, but too bad the HP /usr/include files don't agree.)
        $2="$$2 -D_HPUX_SOURCE"
        $3="$$3 -D_HPUX_SOURCE"
        $5="$$5 -D_HPUX_SOURCE"
        ;;
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    arm*linux*)
        # On arm/linux and arm/android, tell gcc to generate Arm
        # instructions (ie not Thumb) and to link using the gold linker.
        # Forcing LD to be ld.gold is done in FIND_LD m4 macro.
        $2="$$2 -marm"
        $3="$$3 -fuse-ld=gold -Wl,-z,noexecstack"
        $4="$$4 -z noexecstack"
        ;;

    aarch64*linux*)
        # On aarch64/linux and aarch64/android, tell gcc to link using the
        # gold linker.
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        # Forcing LD to be ld.gold is done in FIND_LD m4 macro.
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        $3="$$3 -fuse-ld=gold -Wl,-z,noexecstack"
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        $4="$$4 -z noexecstack"
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        ;;
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    powerpc-ibm-aix*)
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        # We need `-D_THREAD_SAFE` to unlock the thread-local `errno`.
        $2="$$2 -D_THREAD_SAFE"
        $3="$$3 -D_THREAD_SAFE -Wl,-bnotextro"
        $4="$$4 -bnotextro"
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        $5="$$5 -D_THREAD_SAFE"
        ;;

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    x86_64-*-openbsd*)
        # We need -z wxneeded at least to link ghc-stage2 to workaround
        # W^X issue in GHCi on OpenBSD current (as of Aug 2016)
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        $3="$$3 -Wl,-z,wxneeded"
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        $4="$$4 -z wxneeded"
        ;;

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


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


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


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


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


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


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# FP_CHECK_SIZEOF_AND_ALIGNMENT(TYPE)
# ------------------------------------------------------------------
# Combines AC_CHECK_SIZEOF and FP_CHECK_ALIGNMENT.
AC_DEFUN([FP_CHECK_SIZEOF_AND_ALIGNMENT],
[AC_CHECK_SIZEOF([$1])
FP_CHECK_ALIGNMENT([$1])
])# FP_CHECK_SIZEOF_AND_ALIGNMENT


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# FP_LEADING_UNDERSCORE
# ---------------------
# Test for determining whether symbol names have a leading underscore. We assume
# that they _haven't_ if anything goes wrong. Sets the output variable
# LeadingUnderscore to YES or NO and defines LEADING_UNDERSCORE correspondingly.
#
# Some nlist implementations seem to try to be compatible by ignoring a leading
# underscore sometimes (eg. FreeBSD). We therefore have to work around this by
# checking for *no* leading underscore first. Sigh.  --SDM
#
# Similarly on OpenBSD, but this test doesn't help. -- dons
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#
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AC_DEFUN([FP_LEADING_UNDERSCORE],
[AC_CHECK_LIB([elf], [nlist], [LIBS="-lelf $LIBS"])
AC_CACHE_CHECK([leading underscore in symbol names], [fptools_cv_leading_underscore], [
# Hack!: nlist() under Digital UNIX insist on there being an _,
# but symbol table listings shows none. What is going on here?!?
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case $TargetPlatform in
*linux-android*) fptools_cv_leading_underscore=no;;
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*openbsd*) # x86 openbsd is ELF from 3.4 >, meaning no leading uscore
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  case $build in
    i386-*2\.@<:@0-9@:>@ | i386-*3\.@<:@0-3@:>@ ) fptools_cv_leading_underscore=yes ;;
    *) fptools_cv_leading_underscore=no ;;
  esac ;;
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i386-unknown-mingw32) fptools_cv_leading_underscore=yes;;
x86_64-unknown-mingw32) fptools_cv_leading_underscore=no;;
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    # HACK: Apple doesn't seem to provide nlist in the 64-bit-libraries
x86_64-apple-darwin*) fptools_cv_leading_underscore=yes;;
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*-apple-ios) fptools_cv_leading_underscore=yes;;
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*) AC_RUN_IFELSE([AC_LANG_SOURCE([[#ifdef HAVE_NLIST_H
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#include <nlist.h>
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struct nlist xYzzY1[] = {{"xYzzY1", 0},{0}};
struct nlist xYzzY2[] = {{"_xYzzY2", 0},{0}};
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#endif

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

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

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

  test "$fp_num1" = "$fp_num2" || break;
done
IFS=$fp_save_IFS
AS_IF([test "$fp_num1" $2 "$fp_num2"], [$4], [$5])[]dnl
])# FP_COMPARE_VERSIONS
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dnl
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dnl Check for Happy and version.
dnl If there's no installed Happy, we look
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dnl for a happy source tree and point the build system at that instead.
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dnl If you increase the minimum version requirement, please also update:
dnl https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Tools
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dnl
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AC_DEFUN([FPTOOLS_HAPPY],
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[AC_PATH_PROG(HappyCmd,happy,)
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AC_CACHE_CHECK([for version of happy], fptools_cv_happy_version,
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changequote(, )dnl
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[if test x"$HappyCmd" != x; then
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   fptools_cv_happy_version=`"$HappyCmd" -v |
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              grep 'Happy Version' | sed -e 's/Happy Version \([^ ]*\).*/\1/g'` ;
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else
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   fptools_cv_happy_version="";
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fi;
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changequote([, ])dnl
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])
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if test ! -f compiler/parser/Parser.hs || test ! -f compiler/cmm/CmmParse.hs
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then
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    FP_COMPARE_VERSIONS([$fptools_cv_happy_version],[-lt],[1.19.4],
      [AC_MSG_ERROR([Happy version 1.19.4 or later is required to compile GHC.])])[]
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fi
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HappyVersion=$fptools_cv_happy_version;
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AC_SUBST(HappyVersion)
])

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dnl
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dnl Check for Alex and version.
dnl If you increase the minimum version requirement, please also update:
dnl https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Tools
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dnl
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AC_DEFUN([FPTOOLS_ALEX],
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[
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AC_PATH_PROG(AlexCmd,alex,)
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AC_CACHE_CHECK([for version of alex], fptools_cv_alex_version,
changequote(, )dnl
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[if test x"$AlexCmd" != x; then
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   fptools_cv_alex_version=`"$AlexCmd" -v |
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              grep 'Alex [Vv]ersion' | sed -e 's/Alex [Vv]ersion \([0-9\.]*\).*/\1/g'` ;
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else
   fptools_cv_alex_version="";
fi;
changequote([, ])dnl
])
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FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-ge],[3.0],
  [Alex3=YES],[Alex3=NO])
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if test ! -f compiler/cmm/CmmLex.hs || test ! -f compiler/parser/Lexer.hs
then
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    FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[3.1.0],
      [AC_MSG_ERROR([Alex version 3.1.0 or later is required to compile GHC.])])[]
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fi
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AlexVersion=$fptools_cv_alex_version;
AC_SUBST(AlexVersion)
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AC_SUBST(Alex3)
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])

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# FP_PROG_LD_FLAG
# ---------------
# Sets the output variable $2 to $1 if ld supports the $1 flag.
# Otherwise the variable's value is empty.
AC_DEFUN([FP_PROG_LD_FLAG],
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[
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AC_CACHE_CHECK([whether ld understands $1], [fp_cv_$2],
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[echo 'int foo() { return 0; }' > conftest.c
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${CC-cc} -c conftest.c
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if ${LdCmd} -r $1 -o conftest2.o conftest.o > /dev/null 2>&1; then
   fp_cv_$2=$1
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else
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   fp_cv_$2=
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fi
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rm -rf conftest*])
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$2=$fp_cv_$2
])# FP_PROG_LD_FLAG


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# FP_PROG_LD_BUILD_ID
# ------------

# Sets the output variable LdHasBuildId to YES if ld supports
# --build-id, or NO otherwise.
AC_DEFUN([FP_PROG_LD_BUILD_ID],
[
AC_CACHE_CHECK([whether ld understands --build-id], [fp_cv_ld_build_id],
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[echo 'int foo() { return 0; }' > conftest.c
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${CC-cc} -c conftest.c
if ${LdCmd} -r --build-id=none -o conftest2.o conftest.o > /dev/null 2>&1; then
   fp_cv_ld_build_id=yes
else
   fp_cv_ld_build_id=no
fi
rm -rf conftest*])
if test "$fp_cv_ld_build_id" = yes; then
  LdHasBuildId=YES
else
  LdHasBuildId=NO
fi
AC_SUBST([LdHasBuildId])
])# FP_PROG_LD_BUILD_ID


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# FP_PROG_LD_IS_GNU
# -----------------
# Sets the output variable LdIsGNULd to YES or NO, depending on whether it is
# GNU ld or not.
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AC_DEFUN([FP_PROG_LD_IS_GNU],[
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AC_CACHE_CHECK([whether ld is GNU ld], [fp_cv_gnu_ld],
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[[if ${LdCmd} --version 2> /dev/null | grep "GNU" > /dev/null 2>&1; then
  fp_cv_gnu_ld=YES
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else
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  fp_cv_gnu_ld=NO
fi]])
AC_SUBST([LdIsGNULd],["$fp_cv_gnu_ld"])
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])# FP_PROG_LD_IS_GNU
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# FP_PROG_LD_NO_COMPACT_UNWIND
# ----------------------------

# Sets the output variable LdHasNoCompactUnwind to YES if ld supports
# -no_compact_unwind, or NO otherwise.
AC_DEFUN([FP_PROG_LD_NO_COMPACT_UNWIND],
[
AC_CACHE_CHECK([whether ld understands -no_compact_unwind], [fp_cv_ld_no_compact_unwind],
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[echo 'int foo() { return 0; }' > conftest.c
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${CC-cc} -c conftest.c
if ${LdCmd} -r -no_compact_unwind -o conftest2.o conftest.o > /dev/null 2>&1; then
   fp_cv_ld_no_compact_unwind=yes
else
   fp_cv_ld_no_compact_unwind=no
fi
rm -rf conftest*])
if test "$fp_cv_ld_no_compact_unwind" = yes; then
  LdHasNoCompactUnwind=YES
else
  LdHasNoCompactUnwind=NO
fi
AC_SUBST([LdHasNoCompactUnwind])
])# FP_PROG_LD_NO_COMPACT_UNWIND


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# FP_PROG_LD_FILELIST
# -------------------

# Sets the output variable LdHasFilelist to YES if ld supports
# -filelist, or NO otherwise.
AC_DEFUN([FP_PROG_LD_FILELIST],
[
AC_CACHE_CHECK([whether ld understands -filelist], [fp_cv_ld_has_filelist],
[
    echo 'int foo() { return 0; }' > conftest1.c
    echo 'int bar() { return 0; }' > conftest2.c
    ${CC-cc} -c conftest1.c
    ${CC-cc} -c conftest2.c
    echo conftest1.o  > conftest.o-files
    echo conftest2.o >> conftest.o-files
    if ${LdCmd} -r -filelist conftest.o-files -o conftest.o > /dev/null 2>&1
    then
        fp_cv_ld_has_filelist=yes
    else
        fp_cv_ld_has_filelist=no
    fi
    rm -rf conftest*
])
if test "$fp_cv_ld_has_filelist" = yes; then
    LdHasFilelist=YES
else
    LdHasFilelist=NO
fi
AC_SUBST([LdHasFilelist])
])# FP_PROG_LD_FILELIST


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# FP_PROG_AR
# ----------
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# Sets fp_prog_ar to a path to ar. Exits if no ar can be found
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AC_DEFUN([FP_PROG_AR],
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[if test -z "$fp_prog_ar"; then
  AC_PATH_PROG([fp_prog_ar], [ar])
fi
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if test -z "$fp_prog_ar"; then
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  AC_MSG_ERROR([cannot find ar in your PATH, no idea how to make a library])
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fi
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])# FP_PROG_AR


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


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

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


# FP_PROG_AR_NEEDS_RANLIB
# -----------------------
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# Sets the output variable RANLIB_CMD to "ranlib" if it is needed and
# found, to "true" otherwise. Sets REAL_RANLIB_CMD to the ranlib program,
# even if we don't need ranlib (libffi might still need it).
AC_DEFUN([FP_PROG_AR_NEEDS_RANLIB],[
    AC_REQUIRE([FP_PROG_AR_IS_GNU])
    AC_REQUIRE([FP_PROG_AR_ARGS])
    AC_REQUIRE([AC_PROG_CC])

    AC_PROG_RANLIB

    if test $fp_prog_ar_is_gnu = yes
    then
        fp_cv_prog_ar_needs_ranlib=no
    elif test "$TargetOS_CPP" = "darwin"
    then
        # It's quite tedious to check for Apple's crazy timestamps in
        # .a files, so we hardcode it.
        fp_cv_prog_ar_needs_ranlib=yes
    else
        case $fp_prog_ar_args in
        *s*)
            fp_cv_prog_ar_needs_ranlib=no;;
        *)
            fp_cv_prog_ar_needs_ranlib=yes;;
        esac
    fi

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    # workaround for AC_PROG_RANLIB which sets RANLIB to `:' when
    # ranlib is missing on the target OS. The problem is that
    # ghc-cabal cannot execute `:' which is a shell built-in but can
    # execute `true' which is usually simple program supported by the
    # OS.
    # Fixes #8795
    if test "$RANLIB" = ":"
    then
        RANLIB="true"
    fi
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    REAL_RANLIB_CMD="$RANLIB"
    if test $fp_cv_prog_ar_needs_ranlib = yes
    then
        RANLIB_CMD="$RANLIB"
    else
        RANLIB_CMD="true"
    fi
    AC_SUBST([REAL_RANLIB_CMD])
    AC_SUBST([RANLIB_CMD])
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])# FP_PROG_AR_NEEDS_RANLIB


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# FP_GCC_VERSION
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# -----------
# Extra testing of the result AC_PROG_CC, testing the gcc version no. Sets the
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# output variable GccVersion.
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AC_DEFUN([FP_GCC_VERSION],
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[AC_REQUIRE([AC_PROG_CC])
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if test -z "$CC"
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then
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  AC_MSG_ERROR([gcc is required])
fi
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GccLT34=NO
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GccLT44=NO
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GccLT46=NO
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AC_CACHE_CHECK([version of gcc], [fp_cv_gcc_version],
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[
    fp_cv_gcc_version="`$CC -v 2>&1 | grep 'version ' | sed -e 's/.*version [[^0-9]]*\([[0-9.]]*\).*/\1/g'`"
    FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-lt], [3.0],
                        [AC_MSG_ERROR([Need at least gcc version 3.0 (3.4+ recommended)])])
    # See #2770: gcc 2.95 doesn't work any more, apparently.  There probably
    # isn't a very good reason for that, but for now just make configure
    # fail.
    FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-lt], [3.4], GccLT34=YES)
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    FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-lt], [4.4], GccLT44=YES)
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    FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-lt], [4.6], GccLT46=YES)
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])
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AC_SUBST([GccVersion], [$fp_cv_gcc_version])
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AC_SUBST(GccLT34)
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AC_SUBST(GccLT44)
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AC_SUBST(GccLT46)
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])# FP_GCC_VERSION
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dnl Check to see if the C compiler is clang or llvm-gcc
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dnl
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GccIsClang=NO
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AC_DEFUN([FP_CC_LLVM_BACKEND],
[AC_REQUIRE([AC_PROG_CC])
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AC_MSG_CHECKING([whether C compiler is clang])
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$CC -x c /dev/null -dM -E > conftest.txt 2>&1
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if grep "__clang__" conftest.txt >/dev/null 2>&1; then
  AC_SUBST([CC_CLANG_BACKEND], [1])
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  AC_SUBST([CC_LLVM_BACKEND], [1])
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  GccIsClang=YES
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  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
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  AC_MSG_CHECKING([whether C compiler has an LLVM back end])
  if grep "__llvm__" conftest.txt >/dev/null 2>&1; then
    AC_SUBST([CC_CLANG_BACKEND], [0])
    AC_SUBST([CC_LLVM_BACKEND], [1])
    AC_MSG_RESULT([yes])
  else
    AC_SUBST([CC_CLANG_BACKEND], [0])
    AC_SUBST([CC_LLVM_BACKEND], [0])
    AC_MSG_RESULT([no])
  fi
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fi
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AC_SUBST(GccIsClang)
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rm -f conftest.txt
])

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# FP_GCC_SUPPORTS_NO_PIE
# ----------------------
# Does gcc support the -no-pie option? If so we should pass it to gcc when
# joining objects since -pie may be enabled by default.
AC_DEFUN([FP_GCC_SUPPORTS_NO_PIE],
[
   AC_REQUIRE([AC_PROG_CC])
   AC_MSG_CHECKING([whether GCC supports -no-pie])
   echo 'int main() { return 0; }' > conftest.c
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   # Some GCC versions only warn when passed an unrecognized flag.
   if $CC -no-pie -x c /dev/null -dM -E > conftest.txt 2>&1 && ! grep -i unrecognized conftest.txt > /dev/null 2>&1; then
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       CONF_GCC_SUPPORTS_NO_PIE=YES
       AC_MSG_RESULT([yes])
   else
       CONF_GCC_SUPPORTS_NO_PIE=NO
       AC_MSG_RESULT([no])
   fi
   rm -f conftest.c conftest.o conftest
])

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dnl Small feature test for perl version. Assumes PerlCmd
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