# This file adds the function to build the gcc C compiler

# Copyright 2007 Yann E. MORIN

# Licensed under the GPL v2. See COPYING in the root of this package

# Download gcc

do_cc_get() {

    local linaro_version

    local linaro_series

    local linaro_base_url="http://launchpad.net/gcc-linaro"

    # Account for the Linaro versioning

    linaro_version="$( echo "${CT_CC_VERSION}"      \

                       |sed -r -e 's/^linaro-//;'   \

                     )"

    linaro_series="$( echo "${linaro_version}"      \

                      |sed -r -e 's/-.*//;'         \

                    )"

    # Ah! gcc folks are kind of 'different': they store the tarballs in

    # subdirectories of the same name! That's because gcc is such /crap/ that

    # it is such /big/ that it needs being splitted for distribution! Sad. :-(

    # Arrgghh! Some of those versions does not follow this convention:

    # gcc-3.3.3 lives in releases/gcc-3.3.3, while gcc-2.95.* isn't in a

    # subdirectory! You bastard!

    CT_GetFile "gcc-${CT_CC_VERSION}"                                                       \

               {ftp,http}://ftp.gnu.org/gnu/gcc{,{,/releases}/gcc-${CT_CC_VERSION}}         \

               ftp://ftp.irisa.fr/pub/mirrors/gcc.gnu.org/gcc/releases/gcc-${CT_CC_VERSION} \

               ftp://ftp.uvsq.fr/pub/gcc/snapshots/${CT_CC_VERSION}                         \

               "${linaro_base_url}/${linaro_series}/${linaro_version}/+download"

    # Starting with GCC 4.3, ecj is used for Java, and will only be

    # built if the configure script finds ecj.jar at the top of the

    # GCC source tree, which will not be there unless we get it and

    # put it there ourselves

    if [ "${CT_CC_LANG_JAVA_USE_ECJ}" = "y" ]; then

        CT_GetFile ecj-latest .jar ftp://gcc.gnu.org/pub/java   \

                                   ftp://sourceware.org/pub/java

    fi

}

# Extract gcc

do_cc_extract() {

    CT_Extract "gcc-${CT_CC_VERSION}"

    CT_Patch "gcc" "${CT_CC_VERSION}"

    # Copy ecj-latest.jar to ecj.jar at the top of the GCC source tree

    if [ "${CT_CC_LANG_JAVA_USE_ECJ}" = "y"                     \

         -a ! -f "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/ecj.jar"   \

       ]; then

        CT_DoExecLog ALL cp -v "${CT_TARBALLS_DIR}/ecj-latest.jar" "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/ecj.jar"

    fi

}

#------------------------------------------------------------------------------

# Core gcc pass 1

do_cc_core_pass_1() {

    # If we're building for bare metal, build the static core gcc,

    # with libgcc.

    # In case we're not bare metal and building a canadian compiler, do nothing

    # In case we're not bare metal, and we're NPTL, build the static core gcc.

    # In any other case, do nothing.

    case "${CT_BARE_METAL},${CT_CANADIAN},${CT_THREADS}" in

        y,*,*)  do_cc_core mode=static;;

        ,y,*)   ;;

        ,,nptl) do_cc_core mode=static;;

        *)      ;;

    esac

}

# Core gcc pass 2

do_cc_core_pass_2() {

    # In case we're building for bare metal, do nothing, we already have

    # our compiler.

    # In case we're not bare metal and building a canadian compiler, do nothing

    # In case we're NPTL, build the shared core gcc and the target libgcc.

    # In any other case, build the static core gcc and, if using gcc-4.3+,

    # also build the target libgcc.

    case "${CT_BARE_METAL},${CT_CANADIAN},${CT_THREADS}" in

        y,*,*)

            if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then

                do_cc_core mode=baremetal build_libgcc=yes build_libstdcxx=yes build_staticlinked=yes build_manuals=yes

            else

                do_cc_core mode=baremetal build_libgcc=yes build_libstdcxx=yes build_manuals=yes

            fi

            ;;

        ,y,*)   ;;

        ,,nptl)

            do_cc_core mode=shared build_libgcc=yes

            ;;

        ,,win32)

            do_cc_core mode=static build_libgcc=yes

            ;;

        *)  if [ "${CT_CC_GCC_4_3_or_later}" = "y" ]; then

                do_cc_core mode=static build_libgcc=yes

            else

                do_cc_core mode=static

            fi

            ;;

    esac

}

#------------------------------------------------------------------------------

# Build core gcc

# This function is used to build both the static and the shared core C conpiler,

# with or without the target libgcc. We need to know wether:

#  - we're building static, shared or bare metal: mode=[static|shared|baremetal]

#  - we need to build libgcc or not             : build_libgcc=[yes|no]       (default: no)

#  - we need to build libstdc++ or not          : build_libstdcxx=[yes|no]    (default: no)

#  - we need to build statically linked or not  : build_staticlinked=[yes|no] (default: no)

# Usage: do_cc_core mode=[static|shared|baremetal] build_libgcc=[yes|no] build_staticlinked=[yes|no]

do_cc_core() {

    local mode

    local build_libgcc=no

    local build_libstdcxx=no

    local build_staticlinked=no

    local build_manuals=no

    local core_prefix_dir

    local lang_opt

    local tmp

    local -a host_libstdcxx_flags

    local -a extra_config

    local -a core_LDFLAGS

    local -a core_targets

    while [ $# -ne 0 ]; do

        eval "${1// /\\ }"

        shift

    done

    lang_opt=c

    case "${mode}" in

        static)

            core_prefix_dir="${CT_CC_CORE_STATIC_PREFIX_DIR}"

            extra_config+=("--with-newlib")

            extra_config+=("--enable-threads=no")

            extra_config+=("--disable-shared")

            copy_headers=y  # For baremetal, as there's no headers to copy,

                            # we copy an empty directory. So, who cares?

            ;;

        shared)

            core_prefix_dir="${CT_CC_CORE_SHARED_PREFIX_DIR}"

            extra_config+=("--enable-shared")

            copy_headers=y

            ;;

        baremetal)

            core_prefix_dir="${CT_PREFIX_DIR}"

            extra_config+=("--with-newlib")

            extra_config+=("--enable-threads=no")

            extra_config+=("--disable-shared")

            [ "${CT_CC_LANG_CXX}" = "y" ] && lang_opt="${lang_opt},c++"

            copy_headers=n

            ;;

        *)

            CT_Abort "Internal Error: 'mode' must be one of: 'static', 'shared' or 'baremetal', not '${mode:-(empty)}'"

            ;;

    esac

    CT_DoStep INFO "Installing ${mode} core C compiler"

    mkdir -p "${CT_BUILD_DIR}/build-cc-core-${mode}"

    cd "${CT_BUILD_DIR}/build-cc-core-${mode}"

    if [ "${CT_CC_GCC_HAS_PKGVERSION_BUGURL}" = "y" ]; then

        # Bare metal delivers the core compiler as final compiler, so add version info and bugurl

        extra_config+=("--with-pkgversion=${CT_PKGVERSION}")

        [ -n "${CT_TOOLCHAIN_BUGURL}" ] && extra_config+=("--with-bugurl=${CT_TOOLCHAIN_BUGURL}")

    fi

    if [ "${copy_headers}" = "y" ]; then

        CT_DoLog DEBUG "Copying headers to install area of bootstrap gcc, so it can build libgcc2"

        CT_DoExecLog ALL cp -a "${CT_HEADERS_DIR}" "${core_prefix_dir}/${CT_TARGET}/include"

    fi

    CT_DoLog EXTRA "Configuring ${mode} core C compiler"

    for tmp in ARCH ABI CPU TUNE FPU FLOAT; do

        eval tmp="\${CT_ARCH_WITH_${tmp}}"

        if [ -n "${tmp}" ]; then

            extra_config+=("${tmp}")

        fi

    done

    if [ "${CT_CC_CXA_ATEXIT}" = "y" ]; then

        extra_config+=("--enable-__cxa_atexit")

    else

        extra_config+=("--disable-__cxa_atexit")

    fi

    # *** WARNING ! ***

    # Keep this full if-else-if-elif-fi-fi block in sync

    # with the same block in do_cc, below.

    if [ "${build_staticlinked}" = "yes" ]; then

        core_LDFLAGS+=("-static")

        host_libstdcxx_flags+=("-static-libgcc")

        host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++")

        host_libstdcxx_flags+=("-lm")

        # Companion libraries are build static (eg !shared), so

        # the libstdc++ is not pulled automatically, although it

        # is needed. Shoe-horn it in our LDFLAGS

        # Ditto libm on some Fedora boxen

        core_LDFLAGS+=("-lstdc++")

        core_LDFLAGS+=("-lm")

    else

        if [ "${CT_CC_STATIC_LIBSTDCXX}" = "y" ]; then

            # this is from CodeSourcery arm-2010q1-202-arm-none-linux-gnueabi.src.tar.bz2

            # build script

            # INFO: if the host gcc is gcc-4.5 then presumably we could use -static-libstdc++,

            #       see http://gcc.gnu.org/ml/gcc-patches/2009-06/msg01635.html

            host_libstdcxx_flags+=("-static-libgcc")

            host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++,-Bdynamic")

            host_libstdcxx_flags+=("-lm")

        elif [ "${CT_COMPLIBS_SHARED}" != "y" ]; then

            # When companion libraries are build static (eg !shared),

            # the libstdc++ is not pulled automatically, although it

            # is needed. Shoe-horn it in our LDFLAGS

            # Ditto libm on some Fedora boxen

            core_LDFLAGS+=("-lstdc++")

            core_LDFLAGS+=("-lm")

        fi

    fi

    if [ "${CT_CC_GCC_USE_GMP_MPFR}" = "y" ]; then

        extra_config+=("--with-gmp=${CT_COMPLIBS_DIR}")

        extra_config+=("--with-mpfr=${CT_COMPLIBS_DIR}")

    fi

    if [ "${CT_CC_GCC_USE_MPC}" = "y" ]; then

        extra_config+=("--with-mpc=${CT_COMPLIBS_DIR}")

    fi

    if [ "${CT_CC_GCC_USE_GRAPHITE}" = "y" ]; then

        extra_config+=("--with-ppl=${CT_COMPLIBS_DIR}")

        # With PPL 0.11+, also pull libpwl if needed

        if [ "${CT_PPL_NEEDS_LIBPWL}" = "y" ]; then

            host_libstdcxx_flags+=("-L${CT_COMPLIBS_DIR}/lib")

            host_libstdcxx_flags+=("-lpwl")

        fi

        extra_config+=("--with-cloog=${CT_COMPLIBS_DIR}")

    elif [ "${CT_CC_GCC_HAS_GRAPHITE}" = "y" ]; then

        extra_config+=("--with-ppl=no")

        extra_config+=("--with-cloog=no")

    fi

    if [ "${CT_CC_GCC_USE_LTO}" = "y" ]; then

        extra_config+=("--with-libelf=${CT_COMPLIBS_DIR}")

        extra_config+=("--enable-lto")

    elif [ "${CT_CC_GCC_HAS_LTO}" = "y" ]; then

        extra_config+=("--with-libelf=no")

        extra_config+=("--disable-lto")

    fi

    if [ ${#host_libstdcxx_flags[@]} -ne 0 ]; then

        extra_config+=("--with-host-libstdcxx=${host_libstdcxx_flags[*]}")

    fi

    if [ "${CT_CC_GCC_ENABLE_TARGET_OPTSPACE}" = "y" ]; then

        extra_config+=("--enable-target-optspace")

    fi

    case "${CT_CC_GCC_LDBL_128}" in

        y)  extra_config+=("--with-long-double-128");;

        m)  ;;

        "") extra_config+=("--without-long-double-128");;

    esac

    if [ "${CT_CC_GCC_BUILD_ID}" = "y" ]; then

        extra_config+=( --enable-linker-build-id )

    fi

    case "${CT_CC_GCC_LNK_HASH_STYLE}" in

        "") ;;

        *)  extra_config+=( "--with-linker-hash-style=${CT_CC_GCC_LNK_HASH_STYLE}" );;

    esac

    case "${CT_ARCH}" in

        mips)

            case "${CT_CC_GCC_mips_llsc}" in

                y)  extra_config+=( --with-llsc );;

                m)  ;;

                *)  extra_config+=( --without-llsc );;

            esac

            case "${CT_CC_GCC_mips_synci}" in

                y)  extra_config+=( --with-synci );;

                m)  ;;

                *)  extra_config+=( --without-synci );;

            esac

            if [ "${CT_CC_GCC_mips_plt}" ]; then

                extra_config+=( --with-mips-plt )

            fi

            ;; # ARCH is mips

    esac

    extra_config+=(--disable-libgomp)

    extra_config+=(--disable-libmudflap)

    [ "${CT_TOOLCHAIN_ENABLE_NLS}" != "y" ] && extra_config+=("--disable-nls")

    [ "${CT_CC_GCC_DISABLE_PCH}" = "y" ] && extra_config+=("--disable-libstdcxx-pch")

    if [ "${CT_CC_GCC_SYSTEM_ZLIB}" = "y" ]; then

        extra_config+=("--with-system-zlib")

    fi

    if [ "${CT_MULTILIB}" = "y" ]; then

        extra_config+=("--enable-multilib")

    else

        extra_config+=("--disable-multilib")

    fi

    CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"

    # Use --with-local-prefix so older gccs don't look in /usr/local (http://gcc.gnu.org/PR10532)

    CT_DoExecLog CFG                                \

    CC_FOR_BUILD="${CT_BUILD}-gcc"                  \

    CFLAGS="${CT_CFLAGS_FOR_HOST}"                  \

    LDFLAGS="${core_LDFLAGS[*]}"                    \

    "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/configure"  \

        --build=${CT_BUILD}                         \

        --host=${CT_HOST}                           \

        --target=${CT_TARGET}                       \

        --prefix="${core_prefix_dir}"               \

        --with-local-prefix="${CT_SYSROOT_DIR}"     \

        --disable-libmudflap                        \

        ${CC_CORE_SYSROOT_ARG}                      \

        "${extra_config[@]}"                        \

        --enable-languages="${lang_opt}"            \

        "${CT_CC_CORE_EXTRA_CONFIG_ARRAY[@]}"

    if [ "${build_libgcc}" = "yes" ]; then

        # HACK: we need to override SHLIB_LC from gcc/config/t-slibgcc-elf-ver or

        # gcc/config/t-libunwind so -lc is removed from the link for

        # libgcc_s.so, as we do not have a target -lc yet.

        # This is not as ugly as it appears to be ;-) All symbols get resolved

        # during the glibc build, and we provide a proper libgcc_s.so for the

        # cross toolchain during the final gcc build.

        #

        # As we cannot modify the source tree, nor override SHLIB_LC itself

        # during configure or make, we have to edit the resultant

        # gcc/libgcc.mk itself to remove -lc from the link.

        # This causes us to have to jump through some hoops...

        #

        # To produce libgcc.mk to edit we firstly require libiberty.a,

        # so we configure then build it.

        # Next we have to configure gcc, create libgcc.mk then edit it...

        # So much easier if we just edit the source tree, but hey...

        if [ ! -f "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/gcc/BASE-VER" ]; then

            CT_DoExecLog CFG make ${JOBSFLAGS} configure-libiberty

            CT_DoExecLog ALL make ${JOBSFLAGS} -C libiberty libiberty.a

            CT_DoExecLog CFG make ${JOBSFLAGS} configure-gcc configure-libcpp

            CT_DoExecLog ALL make ${JOBSFLAGS} all-libcpp

        else

            CT_DoExecLog CFG make ${JOBSFLAGS} configure-gcc configure-libcpp configure-build-libiberty

            CT_DoExecLog ALL make ${JOBSFLAGS} all-libcpp all-build-libiberty

        fi

        # HACK: gcc-4.2 uses libdecnumber to build libgcc.mk, so build it here.

        if [ -d "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/libdecnumber" ]; then

            CT_DoExecLog CFG make ${JOBSFLAGS} configure-libdecnumber

            CT_DoExecLog ALL make ${JOBSFLAGS} -C libdecnumber libdecnumber.a

        fi

        # Starting with GCC 4.3, libgcc.mk is no longer built,

        # and libgcc.mvars is used instead.

        if [ "${CT_CC_GCC_4_3_or_later}" = "y" ]; then

            libgcc_rule="libgcc.mvars"

            core_targets=( gcc target-libgcc )

        else

            libgcc_rule="libgcc.mk"

            core_targets=( gcc )

        fi

        # On bare metal and canadian build the host-compiler is used when

        # actually the build-system compiler is required. Choose the correct

        # compilers for canadian build and use the defaults on other

        # configurations.

        if [ "${CT_BARE_METAL},${CT_CANADIAN}" = "y,y" ]; then

            repair_cc="CC_FOR_BUILD=${CT_BUILD}-gcc \

                       GCC_FOR_TARGET=${CT_TARGET}-gcc"

        else

            repair_cc=""

        fi

        CT_DoExecLog ALL make ${JOBSFLAGS} -C gcc ${libgcc_rule} \

                              ${repair_cc}

        sed -r -i -e 's@-lc@@g' gcc/${libgcc_rule}

    else # build_libgcc

        core_targets=( gcc )

    fi   # ! build libgcc

    if [    "${build_libstdcxx}" = "yes"    \

         -a "${CT_CC_LANG_CXX}"  = "y"      \

       ]; then

        core_targets+=( target-libstdc++-v3 )

    fi

    CT_DoLog EXTRA "Building ${mode} core C compiler"

    CT_DoExecLog ALL make ${JOBSFLAGS} "${core_targets[@]/#/all-}"

    CT_DoLog EXTRA "Installing ${mode} core C compiler"

    CT_DoExecLog ALL make ${JOBSFLAGS} "${core_targets[@]/#/install-}"

    if [ "${CT_BUILD_MANUALS}" = "y" -a "${build_manuals}" = "yes" ]; then

        CT_DoLog EXTRA "Building the GCC manuals"

        CT_DoExecLog ALL make pdf html

        CT_DoLog EXTRA "Installing the GCC manuals"

        CT_DoExecLog ALL make install-{pdf,html}-gcc

    fi

    # Create a symlink ${CT_TARGET}-cc to ${CT_TARGET}-gcc to always be able

    # to call the C compiler with the same, somewhat canonical name.

    # check whether compiler has an extension

    file="$( ls -1 "${core_prefix_dir}/bin/${CT_TARGET}-gcc."* 2>/dev/null || true )"

    [ -z "${file}" ] || ext=".${file##*.}"

    CT_DoExecLog ALL ln -sfv "${CT_TARGET}-gcc${ext}" "${core_prefix_dir}/bin/${CT_TARGET}-cc${ext}"

    if [ "${CT_MULTILIB}" = "y" ]; then

        multilibs=( $( "${core_prefix_dir}/bin/${CT_TARGET}-gcc" -print-multi-lib   \

                       |tail -n +2 ) )

        if [ ${#multilibs[@]} -ne 0 ]; then

            CT_DoLog EXTRA "gcc configured with these multilibs (besides the default):"

            for i in "${multilibs[@]}"; do

                dir="${i%%;*}"

                flags="${i#*;}"

                CT_DoLog EXTRA "   ${flags//@/ -}  -->  ${dir}/"

            done

        else

            CT_DoLog WARN "gcc configured for multilib, but none available"

        fi

    fi

    CT_EndStep

}

#------------------------------------------------------------------------------

# Build final gcc

do_cc() {

    local -a host_libstdcxx_flags

    local -a extra_config

    local -a final_LDFLAGS

    local tmp

    # If building for bare metal, nothing to be done here, the static core conpiler is enough!

    [ "${CT_BARE_METAL}" = "y" ] && return 0

    CT_DoStep INFO "Installing final compiler"

    mkdir -p "${CT_BUILD_DIR}/build-cc"

    cd "${CT_BUILD_DIR}/build-cc"

    CT_DoLog EXTRA "Configuring final compiler"

    # Enable selected languages

    lang_opt="c"

    [ "${CT_CC_LANG_CXX}" = "y"      ] && lang_opt="${lang_opt},c++"

    [ "${CT_CC_LANG_FORTRAN}" = "y"  ] && lang_opt="${lang_opt},fortran"

    [ "${CT_CC_LANG_ADA}" = "y"      ] && lang_opt="${lang_opt},ada"

    [ "${CT_CC_LANG_JAVA}" = "y"     ] && lang_opt="${lang_opt},java"

    [ "${CT_CC_LANG_OBJC}" = "y"     ] && lang_opt="${lang_opt},objc"

    [ "${CT_CC_LANG_OBJCXX}" = "y"   ] && lang_opt="${lang_opt},obj-c++"

    CT_Test "Building ADA language is not yet supported. Will try..." "${CT_CC_LANG_ADA}" = "y"

    CT_Test "Building Objective-C language is not yet supported. Will try..." "${CT_CC_LANG_OBJC}" = "y"

    CT_Test "Building Objective-C++ language is not yet supported. Will try..." "${CT_CC_LANG_OBJCXX}" = "y"

    CT_Test "Building ${CT_CC_LANG_OTHERS//,/ } language(s) is not yet supported. Will try..." -n "${CT_CC_LANG_OTHERS}"

    lang_opt=$(echo "${lang_opt},${CT_CC_LANG_OTHERS}" |sed -r -e 's/,+/,/g; s/,*$//;')

    extra_config+=("--enable-languages=${lang_opt}")

    for tmp in ARCH ABI CPU TUNE FPU FLOAT; do

        eval tmp="\${CT_ARCH_WITH_${tmp}}"

        if [ -n "${tmp}" ]; then

            extra_config+=("${tmp}")

        fi

    done

    [ "${CT_SHARED_LIBS}" = "y" ] || extra_config+=("--disable-shared")

    if [ "${CT_CC_GCC_HAS_PKGVERSION_BUGURL}" = "y" ]; then

        extra_config+=("--with-pkgversion=${CT_PKGVERSION}")

        [ -n "${CT_TOOLCHAIN_BUGURL}" ] && extra_config+=("--with-bugurl=${CT_TOOLCHAIN_BUGURL}")

    fi

    case "${CT_CC_GCC_SJLJ_EXCEPTIONS}" in

        y)  extra_config+=("--enable-sjlj-exceptions");;

        m)  ;;

        "") extra_config+=("--disable-sjlj-exceptions");;

    esac

    if [ "${CT_CC_CXA_ATEXIT}" = "y" ]; then

        extra_config+=("--enable-__cxa_atexit")

    else

        extra_config+=("--disable-__cxa_atexit")

    fi

    if [ -n "${CT_CC_ENABLE_CXX_FLAGS}" ]; then

        extra_config+=("--enable-cxx-flags=${CT_CC_ENABLE_CXX_FLAGS}")

    fi

    if [ "${CT_CC_GCC_LIBMUDFLAP}" = "y" ]; then

        extra_config+=(--enable-libmudflap)

    else

        extra_config+=(--disable-libmudflap)

    fi

    if [ "${CT_CC_GCC_LIBGOMP}" = "y" ]; then

        extra_config+=(--enable-libgomp)

    else

        extra_config+=(--disable-libgomp)

    fi

    if [ "${CT_CC_GCC_LIBSSP}" = "y" ]; then

        extra_config+=(--enable-libssp)

    else

        extra_config+=(--disable-libssp)

    fi

    # *** WARNING ! ***

    # Keep this full if-else-if-elif-fi-fi block in sync

    # with the same block in do_cc_core, above.

    if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then

        final_LDFLAGS+=("-static")

        host_libstdcxx_flags+=("-static-libgcc")

        host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++")

        host_libstdcxx_flags+=("-lm")

        # Companion libraries are build static (eg !shared), so

        # the libstdc++ is not pulled automatically, although it

        # is needed. Shoe-horn it in our LDFLAGS

        # Ditto libm on some Fedora boxen

        final_LDFLAGS+=("-lstdc++")

        final_LDFLAGS+=("-lm")

    else

        if [ "${CT_CC_STATIC_LIBSTDCXX}" = "y" ]; then

            # this is from CodeSourcery arm-2010q1-202-arm-none-linux-gnueabi.src.tar.bz2

            # build script

            # INFO: if the host gcc is gcc-4.5 then presumably we could use -static-libstdc++,

            #       see http://gcc.gnu.org/ml/gcc-patches/2009-06/msg01635.html

            host_libstdcxx_flags+=("-static-libgcc")

            host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++,-Bdynamic")

            host_libstdcxx_flags+=("-lm")

        elif [ "${CT_COMPLIBS_SHARED}" != "y" ]; then

            # When companion libraries are build static (eg !shared),

            # the libstdc++ is not pulled automatically, although it

            # is needed. Shoe-horn it in our LDFLAGS

            # Ditto libm on some Fedora boxen

            final_LDFLAGS+=("-lstdc++")

            final_LDFLAGS+=("-lm")

        fi

    fi

    if [ "${CT_CC_GCC_USE_GMP_MPFR}" = "y" ]; then

        extra_config+=("--with-gmp=${CT_COMPLIBS_DIR}")

        extra_config+=("--with-mpfr=${CT_COMPLIBS_DIR}")

    fi

    if [ "${CT_CC_GCC_USE_MPC}" = "y" ]; then

        extra_config+=("--with-mpc=${CT_COMPLIBS_DIR}")

    fi

    if [ "${CT_CC_GCC_USE_GRAPHITE}" = "y" ]; then

        extra_config+=("--with-ppl=${CT_COMPLIBS_DIR}")

        # With PPL 0.11+, also pull libpwl if needed

        if [ "${CT_PPL_NEEDS_LIBPWL}" = "y" ]; then

            host_libstdcxx_flags+=("-L${CT_COMPLIBS_DIR}/lib")

            host_libstdcxx_flags+=("-lpwl")

        fi

        extra_config+=("--with-cloog=${CT_COMPLIBS_DIR}")

    elif [ "${CT_CC_GCC_HAS_GRAPHITE}" = "y" ]; then

        extra_config+=("--with-ppl=no")

        extra_config+=("--with-cloog=no")

    fi

    if [ "${CT_CC_GCC_USE_LTO}" = "y" ]; then

        extra_config+=("--with-libelf=${CT_COMPLIBS_DIR}")

    elif [ "${CT_CC_GCC_HAS_LTO}" = "y" ]; then

        extra_config+=("--with-libelf=no")

    fi

    if [ ${#host_libstdcxx_flags[@]} -ne 0 ]; then

        extra_config+=("--with-host-libstdcxx=${host_libstdcxx_flags[*]}")

    fi

    if [ "${CT_THREADS}" = "none" ]; then

        extra_config+=("--disable-threads")

        if [ "${CT_CC_GCC_4_2_or_later}" = y ]; then

            CT_Test "Disabling libgomp for no-thread gcc>=4.2" "${CT_CC_GCC_LIBGOMP}" = "Y"

            extra_config+=("--disable-libgomp")

        fi

    else

        if [ "${CT_THREADS}" = "win32" ]; then

            extra_config+=("--enable-threads=win32")

            extra_config+=("--disable-win32-registry")

        else

            extra_config+=("--enable-threads=posix")

        fi

    fi

    if [ "${CT_CC_GCC_ENABLE_TARGET_OPTSPACE}" = "y" ]; then

        extra_config+=("--enable-target-optspace")

    fi

    if [ "${CT_CC_GCC_DISABLE_PCH}" = "y" ]; then

        extra_config+=("--disable-libstdcxx-pch")

    fi

    case "${CT_CC_GCC_LDBL_128}" in

        y)  extra_config+=("--with-long-double-128");;

        m)  ;;

        "") extra_config+=("--without-long-double-128");;

    esac

    if [ "${CT_CC_GCC_BUILD_ID}" = "y" ]; then

        extra_config+=( --enable-linker-build-id )

    fi

    case "${CT_CC_GCC_LNK_HASH_STYLE}" in

        "") ;;

        *)  extra_config+=( "--with-linker-hash-style=${CT_CC_GCC_LNK_HASH_STYLE}" );;

    esac

    if [ "${CT_CC_GCC_ENABLE_PLUGINS}" = "y" ]; then

        extra_config+=( --enable-plugin )

    fi

    if [ "${CT_CC_GCC_GOLD}" = "y" ]; then

        extra_config+=( --enable-gold )

    fi

    case "${CT_ARCH}" in

        mips)

            case "${CT_CC_GCC_mips_llsc}" in

                y)  extra_config+=( --with-llsc );;

                m)  ;;

                *)  extra_config+=( --without-llsc );;

            esac

            case "${CT_CC_GCC_mips_synci}" in

                y)  extra_config+=( --with-synci );;

                m)  ;;

                *)  extra_config+=( --without-synci );;

            esac

            if [ "${CT_CC_GCC_mips_plt}" ]; then

                extra_config+=( --with-mips-plt )

            fi

            ;; # ARCH is mips

    esac

    [ "${CT_TOOLCHAIN_ENABLE_NLS}" != "y" ] && extra_config+=("--disable-nls")

    if [ "${CT_CC_GCC_SYSTEM_ZLIB}" = "y" ]; then

        extra_config+=("--with-system-zlib")

    fi

    if [ "${CT_MULTILIB}" = "y" ]; then

        extra_config+=("--enable-multilib")

    else

        extra_config+=("--disable-multilib")

    fi

    CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"

    CT_DoExecLog CFG                                \

    CC_FOR_BUILD="${CT_BUILD}-gcc"                  \

    CFLAGS="${CT_CFLAGS_FOR_HOST}"                  \

    LDFLAGS="${final_LDFLAGS[*]}"                   \

    CFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}"         \

    CXXFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}"       \

    LDFLAGS_FOR_TARGET="${CT_TARGET_LDFLAGS}"       \

    "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/configure"  \

        --build=${CT_BUILD}                         \

        --host=${CT_HOST}                           \

        --target=${CT_TARGET}                       \

        --prefix="${CT_PREFIX_DIR}"                 \

        ${CC_SYSROOT_ARG}                           \

        "${extra_config[@]}"                        \

        --with-local-prefix="${CT_SYSROOT_DIR}"     \

        --enable-c99                                \

        --enable-long-long                          \

        "${CT_CC_EXTRA_CONFIG_ARRAY[@]}"

    if [ "${CT_CANADIAN}" = "y" ]; then

        CT_DoLog EXTRA "Building libiberty"

        CT_DoExecLog ALL make ${JOBSFLAGS} all-build-libiberty

    fi

    CT_DoLog EXTRA "Building final compiler"

    CT_DoExecLog ALL make ${JOBSFLAGS} all

    CT_DoLog EXTRA "Installing final compiler"

    CT_DoExecLog ALL make ${JOBSFLAGS} install

    if [ "${CT_BUILD_MANUALS}" = "y" ]; then

        CT_DoLog EXTRA "Building the GCC manuals"

        CT_DoExecLog ALL make ${JOBSFLAGS} pdf html

        CT_DoLog EXTRA "Installing the GCC manuals"

        CT_DoExecLog ALL make install-{pdf,html}-gcc

    fi

    # Create a symlink ${CT_TARGET}-cc to ${CT_TARGET}-gcc to always be able

    # to call the C compiler with the same, somewhat canonical name.

    # check whether compiler has an extension

    file="$( ls -1 "${CT_PREFIX_DIR}/bin/${CT_TARGET}-gcc."* 2>/dev/null || true )"

    [ -z "${file}" ] || ext=".${file##*.}"

    CT_DoExecLog ALL ln -sfv "${CT_TARGET}-gcc${ext}" "${CT_PREFIX_DIR}/bin/${CT_TARGET}-cc${ext}"

    if [ "${CT_MULTILIB}" = "y" ]; then

        multilibs=( $( "${CT_PREFIX_DIR}/bin/${CT_TARGET}-gcc" -print-multi-lib \

                       |tail -n +2 ) )

        if [ ${#multilibs[@]} -ne 0 ]; then

            CT_DoLog EXTRA "gcc configured with these multilibs (besides the default):"

            for i in "${multilibs[@]}"; do

                dir="${i%%;*}"

                flags="${i#*;}"

                CT_DoLog EXTRA "   ${flags//@/ -}  -->  ${dir}/"

            done

        else

            CT_DoLog WARN "gcc configured for multilib, but none available"

        fi

    fi

    CT_EndStep

}