Fix the references to old config variables

Signed-off-by: Alexey Neyman <stilor@att.net>

1 files changed, 1156 insertions, 0 deletions

diff --git a/scripts/build/cc/gcc.sh b/scripts/build/cc/gcc.sh
new file mode 100644
index 0000000..449aafb
--- /dev/null
+++ b/scripts/build/cc/gcc.sh
@@ -0,0 +1,1156 @@
+# 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_gcc_get() {
+    local linaro_version=""
+    local linaro_series=""
+
+    CT_Fetch GCC
+
+    # 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 [ "${CT_CC_LANG_JAVA_USE_ECJ}" = "y" ]; then
+        CT_GetFile ecj-latest .jar http://mirrors.kernel.org/sourceware/java/ \
+                                   ftp://gcc.gnu.org/pub/java                 \
+                                   ftp://sourceware.org/pub/java
+    fi
+}
+
+# Extract gcc
+do_gcc_extract() {
+    # TBD handle xtensa overlays
+    CT_ExtractPatch GCC
+
+    # Copy ecj-latest.jar to ecj.jar at the top of the GCC source tree
+    if [ "${CT_CC_LANG_JAVA_USE_ECJ}" = "y" -a ! -f "${CT_SRC_DIR}/gcc/ecj.jar" ]; then
+        CT_DoExecLog ALL cp -v "${CT_TARBALLS_DIR}/ecj-latest.jar" "${CT_SRC_DIR}/gcc/ecj.jar"
+    fi
+}
+
+#------------------------------------------------------------------------------
+# This function builds up the set of languages to enable
+# No argument expected, returns the comma-separated language list on stdout
+cc_gcc_lang_list() {
+    local lang_list
+
+    lang_list="c"
+    [ "${CT_CC_LANG_CXX}" = "y"      ] && lang_list+=",c++"
+    [ "${CT_CC_LANG_FORTRAN}" = "y"  ] && lang_list+=",fortran"
+    [ "${CT_CC_LANG_ADA}" = "y"      ] && lang_list+=",ada"
+    [ "${CT_CC_LANG_JAVA}" = "y"     ] && lang_list+=",java"
+    [ "${CT_CC_LANG_OBJC}" = "y"     ] && lang_list+=",objc"
+    [ "${CT_CC_LANG_OBJCXX}" = "y"   ] && lang_list+=",obj-c++"
+    [ "${CT_CC_LANG_GOLANG}" = "y"   ] && lang_list+=",go"
+    lang_list+="${CT_CC_LANG_OTHERS:+,${CT_CC_LANG_OTHERS}}"
+
+    printf "%s" "${lang_list}"
+}
+
+#------------------------------------------------------------------------------
+# Report the type of a GCC option
+cc_gcc_classify_opt() {
+    # Options present in multiple architectures
+    case "${1}" in
+        -march=*) echo "arch"; return;;
+        -mabi=*) echo "abi"; return;;
+        -mcpu=*|-mmcu=*) echo "cpu"; return;;
+        -mtune=*) echo "tune"; return;;
+        -mfpu=*) echo "fpu"; return;;
+        -mhard-float|-msoft-float|-mno-soft-float|-mno-float|-mfloat-abi=*|\
+            -mfpu|-mno-fpu) echo "float"; return;;
+        -EB|-EL|-mbig-endian|-mlittle-endian|-mbig|-mlittle|-meb|-mel|-mb|-ml) echo "endian"; return;;
+        -mthumb|-marm) echo "mode"; return;;
+    esac
+
+    # Arch-specific options and aliases
+    case "${CT_ARCH}" in
+        m68k)
+            case "${1}" in
+                -m68881) echo "float"; return;;
+                -m5[234]*|-mcfv4e) echo "cpu"; return;;
+                -m68*|-mc68*) echo "arch"; return;;
+            esac
+            ;;
+        mips)
+            case "${1}" in
+                -mips[1234]|-mips32|-mips32r*|-mips64|-mips64r*) echo "cpu"; return;;
+            esac
+            ;;
+        sh)
+            case "${1}" in
+                -m[12345]*) echo "cpu"; return;;
+            esac
+    esac
+
+    # All tried and failed
+    echo "unknown"
+}
+
+evaluate_multilib_cflags()
+{
+    local multi_dir multi_os_dir multi_os_dir_gcc multi_root multi_flags multi_index multi_count
+    local mdir mdir_os dirtop
+    local f
+
+    for arg in "$@"; do
+        eval "${arg// /\\ }"
+    done
+
+    mdir="lib/${multi_dir}"
+    mdir_os="lib/${multi_os_dir_gcc}"
+    CT_SanitizeVarDir mdir mdir_os
+    CT_DoLog EXTRA "   '${multi_flags}' --> ${mdir} (gcc)   ${mdir_os} (os)"
+    for f in ${multi_flags}; do
+        eval ml_`cc_gcc_classify_opt ${f}`=seen
+    done
+    if [ "${CT_DEMULTILIB}" = "y" -a "${CT_USE_SYSROOT}" = "y" ]; then
+        case "${mdir_os}" in
+            lib/*)
+                ;;
+            *)
+                dirtop="${mdir_os%%/*}"
+                if [ ! -e "${multi_root}/${mdir_os}" ]; then
+                    CT_DoExecLog ALL ln -sfv lib "${multi_root}/${mdir_os}"
+                fi
+                if [ ! -e "${multi_root}/usr/${mdir_os}" ]; then
+                    CT_DoExecLog ALL ln -sfv lib "${multi_root}/usr/${mdir_os}"
+                fi
+                ;;
+        esac
+    fi
+}
+
+#------------------------------------------------------------------------------
+# This function lists the multilibs configured in the compiler (even if multilib
+# is disabled - so that it lists the default GCC/OS directory, which may differ
+# from the default 'lib'). It then performs a few multilib checks/quirks:
+#
+# 1. On MIPS target, gcc (or rather, ld, which it invokes under the hood) chokes
+# if supplied with two -mabi=* options. I.e., 'gcc -mabi=n32' and 'gcc -mabi=32' both
+# work, but 'gcc -mabi=32 -mabi=n32' produces an internal error in ld. Thus we do
+# not supply target's CFLAGS in multilib builds - and after compiling pass-1 gcc,
+# attempt to determine which CFLAGS need to be filtered out.
+#
+# 2. If "demultilibing" is in effect, create top-level directories for any
+# multilibs not in lib/ as symlinks to lib.
+cc_gcc_multilib_housekeeping() {
+    local cc host
+    local ml_arch ml_abi ml_cpu ml_tune ml_fpu ml_float ml_endian ml_mode ml_unknown ml
+    local new_cflags
+
+    for arg in "$@"; do
+        eval "${arg// /\\ }"
+    done
+
+    if [ \( "${CT_CANADIAN}" = "y" -o "${CT_CROSS_NATIVE}" = "y" \) -a "${host}" = "${CT_HOST}" ]; then
+        CT_DoLog EXTRA "Canadian Cross/Cross-native unable to confirm multilibs configuration "\
+            "directly; will use build-compiler for housekeeping."
+        # Since we cannot run the desired compiler, substitute build-CC with the assumption
+        # that the host-CC is configured in the same way.
+        cc="${CT_BUILDTOOLS_PREFIX_DIR}/bin/${CT_TARGET}-${CT_CC}"
+    fi
+
+    CT_IterateMultilibs evaluate_multilib_cflags evaluate_cflags
+
+    # Filtering out some of the options provided in CT-NG config. Then *prepend*
+    # them to CT_TARGET_CFLAGS, like scripts/crosstool-NG.sh does. Zero out
+    # the stashed MULTILIB flags so that we don't process them again in the passes
+    # that follow.
+    CT_DoLog DEBUG "Configured target CFLAGS: '${CT_ARCH_TARGET_CFLAGS_MULTILIB}'"
+    ml_unknown= # Pass through anything we don't know about
+    for f in ${CT_ARCH_TARGET_CFLAGS_MULTILIB}; do
+        eval ml=\$ml_`cc_gcc_classify_opt ${f}`
+        if [ "${ml}" != "seen" ]; then
+            new_cflags="${new_cflags} ${f}"
+        fi
+    done
+    CT_DoLog DEBUG "Filtered target CFLAGS: '${new_cflags}'"
+    CT_EnvModify CT_TARGET_CFLAGS "${new_cflags} ${CT_TARGET_CFLAGS}"
+    CT_EnvModify CT_ARCH_TARGET_CFLAGS_MULTILIB ""
+
+    # Currently, the only LDFLAGS are endianness-related
+    CT_DoLog DEBUG "Configured target LDFLAGS: '${CT_ARCH_TARGET_LDFLAGS_MULTILIB}'"
+    if [ "${ml_endian}" != "seen" ]; then
+        CT_EnvModify CT_TARGET_LDFLAGS "${CT_ARCH_TARGET_LDFLAGS_MULTILIB} ${CT_TARGET_LDFLAGS}"
+        CT_EnvModify CT_ARCH_TARGET_LDFLAGS_MULTILIB ""
+    fi
+    CT_DoLog DEBUG "Filtered target LDFLAGS: '${CT_ARCH_TARGET_LDFLAGS_MULTILIB}'"
+}
+
+#------------------------------------------------------------------------------
+# Core gcc pass 1
+do_gcc_core_pass_1() {
+    local -a core_opts
+
+    if [ "${CT_CC_CORE_PASS_1_NEEDED}" != "y" ]; then
+        return 0
+    fi
+
+    core_opts+=( "mode=static" )
+    core_opts+=( "host=${CT_BUILD}" )
+    core_opts+=( "complibs=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    core_opts+=( "prefix=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    core_opts+=( "cflags=${CT_CFLAGS_FOR_BUILD}" )
+    core_opts+=( "ldflags=${CT_LDFLAGS_FOR_BUILD}" )
+    core_opts+=( "lang_list=c" )
+    core_opts+=( "build_step=core1" )
+
+    CT_DoStep INFO "Installing pass-1 core C gcc compiler"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-cc-gcc-core-pass-1"
+
+    do_gcc_core_backend "${core_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+# Core gcc pass 2
+do_gcc_core_pass_2() {
+    local -a core_opts
+
+    if [ "${CT_CC_CORE_PASS_2_NEEDED}" != "y" ]; then
+        return 0
+    fi
+
+    # Common options:
+    core_opts+=( "host=${CT_BUILD}" )
+    core_opts+=( "prefix=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    core_opts+=( "complibs=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    core_opts+=( "cflags=${CT_CFLAGS_FOR_BUILD}" )
+    core_opts+=( "ldflags=${CT_LDFLAGS_FOR_BUILD}" )
+    core_opts+=( "lang_list=c" )
+    core_opts+=( "build_step=core2" )
+
+    # Different conditions are at stake here:
+    #   - In case the threading model is NPTL, we need a shared-capable core
+    #     gcc; in all other cases, we need a static-only core gcc.
+    #   - In case the threading model is NPTL or win32, or gcc is 4.3 or
+    #     later, we need to build libgcc
+    case "${CT_THREADS}" in
+        nptl)
+            core_opts+=( "mode=shared" )
+            core_opts+=( "build_libgcc=yes" )
+            ;;
+        win32)
+            core_opts+=( "mode=static" )
+            core_opts+=( "build_libgcc=yes" )
+            ;;
+        *)
+            core_opts+=( "mode=static" )
+            core_opts+=( "build_libgcc=yes" )
+            ;;
+    esac
+
+    CT_DoStep INFO "Installing pass-2 core C gcc compiler"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-cc-gcc-core-pass-2"
+
+    do_gcc_core_backend "${core_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+#------------------------------------------------------------------------------
+# Build core gcc
+# This function is used to build the core C compiler.
+# Usage: do_gcc_core_backend param=value [...]
+#   Parameter           : Definition                                : Type      : Default
+#   mode                : build a 'static', 'shared' or 'baremetal' : string    : (none)
+#   host                : the machine the core will run on          : tuple     : (none)
+#   prefix              : dir prefix to install into                : dir       : (none)
+#   complibs            : dir where complibs are installed          : dir       : (none)
+#   lang_list           : the list of languages to build            : string    : (empty)
+#   build_libgcc        : build libgcc or not                       : bool      : no
+#   build_libstdcxx     : build libstdc++ or not                    : bool      : no
+#   build_libgfortran   : build libgfortran or not                  : bool      : no
+#   build_staticlinked  : build statically linked or not            : bool      : no
+#   build_manuals       : whether to build manuals or not           : bool      : no
+#   cflags              : cflags to use                             : string    : (empty)
+#   ldflags             : ldflags to use                            : string    : (empty)
+#   build_step          : build step 'core1', 'core2', 'gcc_build'
+#                         or 'gcc_host'                             : string    : (none)
+# Usage: do_gcc_core_backend mode=[static|shared|baremetal] build_libgcc=[yes|no] build_staticlinked=[yes|no]
+do_gcc_core_backend() {
+    local mode
+    local build_libgcc=no
+    local build_libstdcxx=no
+    local build_libgfortran=no
+    local build_staticlinked=no
+    local build_manuals=no
+    local host
+    local prefix
+    local complibs
+    local lang_list
+    local cflags
+    local cflags_for_build
+    local ldflags
+    local build_step
+    local log_txt
+    local tmp
+    local -a host_libstdcxx_flags
+    local -a extra_config
+    local -a core_LDFLAGS
+    local -a core_targets
+    local -a core_targets_all
+    local -a core_targets_install
+    local -a extra_user_config
+    local arg
+
+    for arg in "$@"; do
+        eval "${arg// /\\ }"
+    done
+
+    # This function gets called in case of a bare metal compiler for the final gcc, too.
+    case "${build_step}" in
+        core1|core2)
+            CT_DoLog EXTRA "Configuring core C gcc compiler"
+            log_txt="gcc"
+            extra_user_config=( "${CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY[@]}" )
+            ;;
+        gcc_build|gcc_host)
+            CT_DoLog EXTRA "Configuring final gcc compiler"
+            extra_user_config=( "${CT_CC_GCC_EXTRA_CONFIG_ARRAY[@]}" )
+            log_txt="final gcc compiler"
+            # to inhibit the libiberty and libgcc tricks later on
+            build_libgcc=no
+            ;;
+        *)
+            CT_Abort "Internal Error: 'build_step' must be one of: 'core1', 'core2', 'gcc_build' or 'gcc_host', not '${build_step:-(empty)}'"
+            ;;
+    esac
+
+    case "${mode}" in
+        static)
+            extra_config+=("--with-newlib")
+            extra_config+=("--enable-threads=no")
+            extra_config+=("--disable-shared")
+            ;;
+        shared)
+            extra_config+=("--enable-shared")
+            ;;
+        baremetal)
+            extra_config+=("--with-newlib")
+            extra_config+=("--enable-threads=no")
+            extra_config+=("--disable-shared")
+            ;;
+        *)
+            CT_Abort "Internal Error: 'mode' must be one of: 'static', 'shared' or 'baremetal', not '${mode:-(empty)}'"
+            ;;
+    esac
+
+    # This is only needed when building libstdc++ in a canadian environment with
+    # this function being used for final step (i.e., when building for bare metal).
+    if [ "${build_step}" = "gcc_build" ]; then
+        CT_DoLog DEBUG "Copying headers to install area of core C compiler"
+        CT_DoExecLog ALL cp -a "${CT_HEADERS_DIR}" "${prefix}/${CT_TARGET}/include"
+    fi
+
+    for tmp in ARCH ABI CPU TUNE FPU FLOAT; do
+        eval tmp="\${CT_ARCH_WITH_${tmp}}"
+        if [ -n "${tmp}" ]; then
+            extra_config+=("${tmp}")
+        fi
+    done
+
+    extra_config+=("--with-pkgversion=${CT_PKGVERSION}")
+    [ -n "${CT_TOOLCHAIN_BUGURL}" ] && extra_config+=("--with-bugurl=${CT_TOOLCHAIN_BUGURL}")
+
+    if [ "${CT_CC_CXA_ATEXIT}" = "y" ]; then
+        extra_config+=("--enable-__cxa_atexit")
+    else
+        extra_config+=("--disable-__cxa_atexit")
+    fi
+
+    if [ -n "${CT_CC_GCC_ENABLE_CXX_FLAGS}" \
+            -a "${mode}" = "baremetal" ]; then
+        extra_config+=("--enable-cxx-flags=${CT_CC_GCC_ENABLE_CXX_FLAGS}")
+    fi
+
+    extra_config+=(--disable-libgomp)
+    extra_config+=(--disable-libmudflap)
+    extra_config+=(--disable-libmpx)
+
+    if [ "${CT_CC_GCC_LIBSSP}" = "y" ]; then
+        extra_config+=(--enable-libssp)
+    else
+        extra_config+=(--disable-libssp)
+    fi
+    if [ "${CT_CC_GCC_LIBQUADMATH}" = "y" ]; then
+        extra_config+=(--enable-libquadmath)
+        extra_config+=(--enable-libquadmath-support)
+    else
+        extra_config+=(--disable-libquadmath)
+        extra_config+=(--disable-libquadmath-support)
+    fi
+
+    core_LDFLAGS+=("${ldflags}")
+
+    # *** WARNING ! ***
+    # Keep this full if-else-if-elif-fi-fi block in sync
+    # with the same block in do_gcc_backend, 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_GCC_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")
+        fi
+        # 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
+
+    extra_config+=("--with-gmp=${complibs}")
+    extra_config+=("--with-mpfr=${complibs}")
+    extra_config+=("--with-mpc=${complibs}")
+    if [ "${CT_CC_GCC_USE_GRAPHITE}" = "y" ]; then
+        if [ "${CT_ISL}" = "y" ]; then
+            extra_config+=("--with-isl=${complibs}")
+        fi
+        if [ "${CT_CLOOG}" = "y" ]; then
+            extra_config+=("--with-cloog=${complibs}")
+        fi
+    else
+        extra_config+=("--with-isl=no")
+        extra_config+=("--with-cloog=no")
+    fi
+    if [ "${CT_CC_GCC_USE_LTO}" = "y" ]; then
+        extra_config+=("--enable-lto")
+    else
+        extra_config+=("--disable-lto")
+    fi
+
+    if [ ${#host_libstdcxx_flags[@]} -ne 0 ]; then
+        extra_config+=("--with-host-libstdcxx=${host_libstdcxx_flags[*]}")
+    fi
+
+    if [ "${CT_CC_GCC_ENABLE_TARGET_OPTSPACE}" = "y" ]; then
+        extra_config+=("--enable-target-optspace")
+    fi
+    if [ "${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
+
+    case "${CT_CC_GCC_DEC_FLOATS}" in
+        "") ;;
+        *)  extra_config+=( "--enable-decimal-float=${CT_CC_GCC_DEC_FLOATS}" );;
+    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
+
+    if [ "${CT_TOOLCHAIN_ENABLE_NLS}" = "y" ]; then
+        extra_config+=("--with-libintl-prefix=${complibs}")
+    else
+        extra_config+=("--disable-nls")
+    fi
+
+    if [ "${CT_CC_GCC_SYSTEM_ZLIB}" = "y" ]; then
+        extra_config+=("--with-system-zlib")
+    fi
+
+    case "${CT_CC_GCC_CONFIG_TLS}" in
+        y)  extra_config+=("--enable-tls");;
+        m)  ;;
+        "") extra_config+=("--disable-tls");;
+    esac
+
+    # Some versions of gcc have a defective --enable-multilib.
+    # Since that's the default, only pass --disable-multilib. For multilib,
+    # also enable multiarch. Without explicit --enable-multiarch, pass-1
+    # compiler is configured as multilib/no-multiarch and pass-2/final
+    # are multilib/multiarch (because gcc autodetects multiarch based on
+    # multiple instances of crt*.o in the install directory - which do
+    # not exist in pass-1).
+    if [ "${CT_MULTILIB}" != "y" ]; then
+        extra_config+=("--disable-multilib")
+    else
+        extra_config+=("--enable-multiarch")
+        if [ -n "${CT_CC_GCC_MULTILIB_LIST}" ]; then
+            extra_config+=("--with-multilib-list=${CT_CC_GCC_MULTILIB_LIST}")
+        fi
+    fi
+
+    CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"
+
+    # We may need to modify host/build CFLAGS separately below
+    cflags_for_build="${CT_CFLAGS_FOR_BUILD}"
+
+    # Clang's default bracket-depth is 256, and building GCC
+    # requires somewhere between 257 and 512.
+    if [ "${host}" = "${CT_BUILD}" ]; then
+        if ${CT_BUILD}-gcc --version 2>&1 | grep clang; then
+            cflags="$cflags "-fbracket-depth=512
+            cflags_for_build="$cflags_for_build "-fbracket-depth=512
+        fi
+    else
+        # FIXME we currently don't support clang as host compiler, only as build
+        if ${CT_BUILD}-gcc --version 2>&1 | grep clang; then
+            cflags_for_build="$cflags_for_build "-fbracket-depth=512
+        fi
+    fi
+
+    # Use --with-local-prefix so older gccs don't look in /usr/local (http://gcc.gnu.org/PR10532)
+    CT_DoExecLog CFG                                   \
+    CC_FOR_BUILD="${CT_BUILD}-gcc"                     \
+    CFLAGS="${cflags}"                                 \
+    CFLAGS_FOR_BUILD="${cflags_for_build}"             \
+    CXXFLAGS="${cflags}"                               \
+    CXXFLAGS_FOR_BUILD="${cflags_for_build}"           \
+    LDFLAGS="${core_LDFLAGS[*]}"                       \
+    CFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}"            \
+    CXXFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}"          \
+    LDFLAGS_FOR_TARGET="${CT_TARGET_LDFLAGS}"          \
+    ${CONFIG_SHELL}                                    \
+    "${CT_SRC_DIR}/gcc/configure"                      \
+        --build=${CT_BUILD}                            \
+        --host=${host}                                 \
+        --target=${CT_TARGET}                          \
+        --prefix="${prefix}"                           \
+        --with-local-prefix="${CT_SYSROOT_DIR}"        \
+        ${CC_CORE_SYSROOT_ARG}                         \
+        "${extra_config[@]}"                           \
+        --enable-languages="${lang_list}"              \
+        "${extra_user_config[@]}"
+
+    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/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/libdecnumber" ]; then
+            CT_DoExecLog CFG make ${JOBSFLAGS} configure-libdecnumber
+            CT_DoExecLog ALL make ${JOBSFLAGS} -C libdecnumber libdecnumber.a
+        fi
+        # HACK: gcc-4.8 uses libbacktrace to make libgcc.mvars, so make it here.
+        if [ -d "${CT_SRC_DIR}/gcc/libbacktrace" ]; then
+            CT_DoExecLog CFG make ${JOBSFLAGS} configure-libbacktrace
+            CT_DoExecLog ALL make ${JOBSFLAGS} -C libbacktrace
+        fi
+
+        libgcc_rule="libgcc.mvars"
+        core_targets=( gcc target-libgcc )
+
+        # On bare metal and canadian build the host-compiler is used when
+        # actually the build-system compiler is required. Choose the correct
+        # compilers for canadian build and use the defaults on other
+        # configurations.
+        if [ "${CT_BARE_METAL},${CT_CANADIAN}" = "y,y" ]; then
+            repair_cc="CC_FOR_BUILD=${CT_BUILD}-gcc \
+                       CXX_FOR_BUILD=${CT_BUILD}-g++ \
+                       GCC_FOR_TARGET=${CT_TARGET}-${CT_CC}"
+        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
+
+    if [    "${build_libgfortran}" = "yes"    \
+         -a "${CT_CC_LANG_FORTRAN}"  = "y"    \
+       ]; then
+        core_targets+=( target-libgfortran )
+    fi
+
+    core_targets_all="${core_targets[@]/#/all-}"
+    core_targets_install="${core_targets[@]/#/install-}"
+
+    case "${build_step}" in
+        gcc_build|gcc_host)
+            core_targets_all=all
+            core_targets_install=install
+            ;;
+    esac
+
+    CT_DoLog EXTRA "Building ${log_txt}"
+    CT_DoExecLog ALL make ${JOBSFLAGS} ${core_targets_all}
+
+    # Do not pass ${JOBSFLAGS} here: recent GCC builds have been failing
+    # in parallel 'make install' at random locations: libitm, libcilk,
+    # always for the files that are installed more than once to the same
+    # location (such as libitm.info).
+    # The symptom is that the install command fails with "File exists"
+    # error; running the same command manually succeeds. It looks like
+    # attempts to remove the destination and re-create it, but another
+    # install gets in the way.
+    CT_DoLog EXTRA "Installing ${log_txt}"
+    CT_DoExecLog ALL make ${core_targets_install}
+
+    # Remove the libtool "pseudo-libraries": having them in the installed
+    # tree makes the libtoolized utilities that are built next assume
+    # that, for example, libsupc++ is an "accessory library", and not include
+    # -lsupc++ to the link flags. That breaks ltrace, for example.
+    CT_DoLog EXTRA "Housekeeping for core gcc compiler"
+    CT_Pushd "${prefix}"
+    find . -type f -name "*.la" -exec rm {} \; |CT_DoLog ALL
+    CT_Popd
+
+    if [ "${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 ${CT_TARGET}-${CT_CC} to always be able
+    # to call the C compiler with the same, somewhat canonical name.
+    # check whether compiler has an extension
+    file="$( ls -1 "${prefix}/bin/${CT_TARGET}-${CT_CC}."* 2>/dev/null || true )"
+    [ -z "${file}" ] || ext=".${file##*.}"
+    if [ -f "${prefix}/bin/${CT_TARGET}-${CT_CC}${ext}" ]; then
+        CT_DoExecLog ALL ln -sfv "${CT_TARGET}-${CT_CC}${ext}" "${prefix}/bin/${CT_TARGET}-cc${ext}"
+    fi
+
+    cc_gcc_multilib_housekeeping cc="${prefix}/bin/${CT_TARGET}-${CT_CC}" \
+        host="${host}"
+}
+
+#------------------------------------------------------------------------------
+# Build complete gcc to run on build
+do_gcc_for_build() {
+    local -a build_final_opts
+    local build_final_backend
+
+    # If native or simple cross toolchain is being built, then build==host;
+    # nothing to do.
+    case "${CT_TOOLCHAIN_TYPE}" in
+        native|cross)   return 0;;
+    esac
+
+    build_final_opts+=( "host=${CT_BUILD}" )
+    build_final_opts+=( "prefix=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    build_final_opts+=( "complibs=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    build_final_opts+=( "cflags=${CT_CFLAGS_FOR_BUILD}" )
+    build_final_opts+=( "ldflags=${CT_LDFLAGS_FOR_BUILD}" )
+    build_final_opts+=( "lang_list=$( cc_gcc_lang_list )" )
+    build_final_opts+=( "build_step=gcc_build" )
+    if [ "${CT_BARE_METAL}" = "y" ]; then
+        # In the tests I've done, bare-metal was not impacted by the
+        # lack of such a compiler, but better safe than sorry...
+        build_final_opts+=( "mode=baremetal" )
+        build_final_opts+=( "build_libgcc=yes" )
+        build_final_opts+=( "build_libstdcxx=yes" )
+        build_final_opts+=( "build_libgfortran=yes" )
+        if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then
+            build_final_opts+=( "build_staticlinked=yes" )
+        fi
+        build_final_backend=do_gcc_core_backend
+    else
+        build_final_backend=do_gcc_backend
+    fi
+
+    CT_DoStep INFO "Installing final gcc compiler for build"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-cc-gcc-final-build-${CT_BUILD}"
+
+    "${build_final_backend}" "${build_final_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+gcc_movelibs() {
+    local multi_flags multi_dir multi_os_dir multi_os_dir_gcc multi_root multi_index multi_count
+    local gcc_dir dst_dir
+    local rel
+
+    for arg in "$@"; do
+        eval "${arg// /\\ }"
+    done
+
+    # Move only files, directories are for other multilibs. We're looking inside
+    # GCC's directory structure, thus use unmangled multi_os_dir that GCC reports.
+    gcc_dir="${CT_PREFIX_DIR}/${CT_TARGET}/lib/${multi_os_dir_gcc}"
+    if [ ! -d "${gcc_dir}" ]; then
+        # GCC didn't install anything outside of sysroot
+        return
+    fi
+    # Depending on the selected libc, we may or may not have the ${multi_os_dir_gcc}
+    # created by libc installation. If we do, use it. If we don't, use ${multi_os_dir}
+    # to avoid creating an otherwise empty directory.
+    dst_dir="${multi_root}/lib/${multi_os_dir_gcc}"
+    if [ ! -d "${dst_dir}" ]; then
+        dst_dir="${multi_root}/lib/${multi_os_dir}"
+    fi
+    CT_SanitizeVarDir dst_dir gcc_dir
+    rel=$( echo "${gcc_dir#${CT_PREFIX_DIR}/}" | sed 's#[^/]\{1,\}#..#g' )
+
+    ls "${gcc_dir}" | while read f; do
+        case "${f}" in
+            *.ld)
+                # Linker scripts remain in GCC's directory; elf2flt insists on
+                # finding them there.
+                continue
+                ;;
+        esac
+        if [ -f "${gcc_dir}/${f}" ]; then
+            CT_DoExecLog ALL mkdir -p "${dst_dir}"
+            CT_DoExecLog ALL mv "${gcc_dir}/${f}" "${dst_dir}/${f}"
+            CT_DoExecLog ALL ln -sf "${rel}/${dst_dir#${CT_PREFIX_DIR}/}/${f}" "${gcc_dir}/${f}"
+        fi
+    done
+}
+
+#------------------------------------------------------------------------------
+# Build final gcc to run on host
+do_gcc_for_host() {
+    local -a final_opts
+    local final_backend
+
+    final_opts+=( "host=${CT_HOST}" )
+    final_opts+=( "prefix=${CT_PREFIX_DIR}" )
+    final_opts+=( "complibs=${CT_HOST_COMPLIBS_DIR}" )
+    final_opts+=( "cflags=${CT_CFLAGS_FOR_HOST}" )
+    final_opts+=( "ldflags=${CT_LDFLAGS_FOR_HOST}" )
+    final_opts+=( "lang_list=$( cc_gcc_lang_list )" )
+    final_opts+=( "build_step=gcc_host" )
+    if [ "${CT_BUILD_MANUALS}" = "y" ]; then
+        final_opts+=( "build_manuals=yes" )
+    fi
+    if [ "${CT_BARE_METAL}" = "y" ]; then
+        final_opts+=( "mode=baremetal" )
+        final_opts+=( "build_libgcc=yes" )
+        final_opts+=( "build_libstdcxx=yes" )
+        final_opts+=( "build_libgfortran=yes" )
+        if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then
+            final_opts+=( "build_staticlinked=yes" )
+        fi
+        final_backend=do_gcc_core_backend
+    else
+        final_backend=do_gcc_backend
+    fi
+
+    CT_DoStep INFO "Installing final gcc compiler"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-cc-gcc-final"
+    "${final_backend}" "${final_opts[@]}"
+    CT_Popd
+
+    # GCC installs stuff (including libgcc) into its own /lib dir,
+    # outside of sysroot, breaking linking with -static-libgcc.
+    # Fix up by moving the libraries into the sysroot.
+    if [ "${CT_USE_SYSROOT}" = "y" ]; then
+        CT_mkdir_pushd "${CT_BUILD_DIR}/build-cc-gcc-final-movelibs"
+        CT_IterateMultilibs gcc_movelibs movelibs
+        CT_Popd
+    fi
+
+    CT_EndStep
+}
+
+#------------------------------------------------------------------------------
+# Build the final gcc
+# Usage: do_gcc_backend param=value [...]
+#   Parameter     : Definition                          : Type      : Default
+#   host          : the host we run onto                : tuple     : (none)
+#   prefix        : the runtime prefix                  : dir       : (none)
+#   complibs      : the companion libraries prefix      : dir       : (none)
+#   cflags        : cflags to use                       : string    : (empty)
+#   ldflags       : ldflags to use                      : string    : (empty)
+#   lang_list     : the list of languages to build      : string    : (empty)
+#   build_manuals : whether to build manuals or not     : bool      : no
+do_gcc_backend() {
+    local host
+    local prefix
+    local complibs
+    local lang_list
+    local cflags
+    local cflags_for_build
+    local ldflags
+    local build_manuals
+    local -a host_libstdcxx_flags
+    local -a extra_config
+    local -a final_LDFLAGS
+    local tmp
+    local arg
+
+    for arg in "$@"; do
+        eval "${arg// /\\ }"
+    done
+
+    CT_DoLog EXTRA "Configuring final gcc compiler"
+
+    # Enable selected languages
+    extra_config+=("--enable-languages=${lang_list}")
+
+    for tmp in ARCH ABI CPU TUNE FPU FLOAT; do
+        eval tmp="\${CT_ARCH_WITH_${tmp}}"
+        if [ -n "${tmp}" ]; then
+            extra_config+=("${tmp}")
+        fi
+    done
+
+    [ "${CT_SHARED_LIBS}" = "y" ] || extra_config+=("--disable-shared")
+    extra_config+=("--with-pkgversion=${CT_PKGVERSION}")
+    [ -n "${CT_TOOLCHAIN_BUGURL}" ] && extra_config+=("--with-bugurl=${CT_TOOLCHAIN_BUGURL}")
+
+    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 "${CT_CC_GCC_ENABLE_CXX_FLAGS}" ]; then
+        extra_config+=("--enable-cxx-flags=${CT_CC_GCC_ENABLE_CXX_FLAGS}")
+    fi
+
+    if [ "${CT_THREADS}" = "none" ]; then
+        extra_config+=(--disable-libatomic)
+    fi
+    if [ "${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
+    if [ "${CT_CC_GCC_LIBQUADMATH}" = "y" ]; then
+        extra_config+=(--enable-libquadmath)
+        extra_config+=(--enable-libquadmath-support)
+    else
+        extra_config+=(--disable-libquadmath)
+        extra_config+=(--disable-libquadmath-support)
+    fi
+
+    if [ "${CT_CC_GCC_LIBSANITIZER}" = "y" ]; then
+        extra_config+=(--enable-libsanitizer)
+    else
+        extra_config+=(--disable-libsanitizer)
+    fi
+
+    if [ "${CT_CC_GCC_HAS_LIBMPX}" = "y" ]; then
+        if [ "${CT_CC_GCC_LIBMPX}" = "y" ]; then
+            extra_config+=(--enable-libmpx)
+        else
+            extra_config+=(--disable-libmpx)
+        fi
+    fi
+
+    final_LDFLAGS+=("${ldflags}")
+
+    # *** WARNING ! ***
+    # Keep this full if-else-if-elif-fi-fi block in sync
+    # with the same block in do_gcc_core_backend, above.
+    if [ "${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 [ "${CT_CC_GCC_STATIC_LIBSTDCXX}" = "y" ]; then
+            # this is from CodeSourcery arm-2010q1-202-arm-none-linux-gnueabi.src.tar.bz2
+            # build script
+            # INFO: if the host gcc is gcc-4.5 then presumably we could use -static-libstdc++,
+            #       see http://gcc.gnu.org/ml/gcc-patches/2009-06/msg01635.html
+            host_libstdcxx_flags+=("-static-libgcc")
+            host_libstdcxx_flags+=("-Wl,-Bstatic,-lstdc++,-Bdynamic")
+            host_libstdcxx_flags+=("-lm")
+        fi
+        # When companion libraries are build static (eg !shared),
+        # the libstdc++ is not pulled automatically, although it
+        # is needed. Shoe-horn it in our LDFLAGS
+        # Ditto libm on some Fedora boxen
+        final_LDFLAGS+=("-lstdc++")
+        final_LDFLAGS+=("-lm")
+    fi
+
+    extra_config+=("--with-gmp=${complibs}")
+    extra_config+=("--with-mpfr=${complibs}")
+    extra_config+=("--with-mpc=${complibs}")
+    if [ "${CT_CC_GCC_USE_GRAPHITE}" = "y" ]; then
+        if [ "${CT_ISL}" = "y" ]; then
+            extra_config+=("--with-isl=${complibs}")
+        fi
+        if [ "${CT_CLOOG}" = "y" ]; then
+            extra_config+=("--with-cloog=${complibs}")
+        fi
+    else
+        extra_config+=("--with-isl=no")
+        extra_config+=("--with-cloog=no")
+    fi
+    if [ "${CT_CC_GCC_USE_LTO}" = "y" ]; then
+        extra_config+=("--enable-lto")
+    else
+        extra_config+=("--disable-lto")
+    fi
+
+    if [ ${#host_libstdcxx_flags[@]} -ne 0 ]; then
+        extra_config+=("--with-host-libstdcxx=${host_libstdcxx_flags[*]}")
+    fi
+
+    if [ "${CT_THREADS}" = "none" ]; then
+        extra_config+=("--disable-threads")
+    else
+        if [ "${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
+
+    case "${CT_CC_GCC_DEC_FLOATS}" in
+        "") ;;
+        *)  extra_config+=( "--enable-decimal-float=${CT_CC_GCC_DEC_FLOATS}" );;
+    esac
+
+    if [ "${CT_CC_GCC_ENABLE_PLUGINS}" = "y" ]; then
+        extra_config+=( --enable-plugin )
+    else
+        extra_config+=( --disable-plugin )
+    fi
+    if [ "${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
+
+    if [ "${CT_TOOLCHAIN_ENABLE_NLS}" = "y" ]; then
+        extra_config+=("--with-libintl-prefix=${complibs}")
+    else
+        extra_config+=("--disable-nls")
+    fi
+
+    if [ "${CT_CC_GCC_SYSTEM_ZLIB}" = "y" ]; then
+        extra_config+=("--with-system-zlib")
+    fi
+
+    case "${CT_CC_GCC_CONFIG_TLS}" in
+        y)  extra_config+=("--enable-tls");;
+        m)  ;;
+        "") extra_config+=("--disable-tls");;
+    esac
+
+    # Some versions of gcc have a defective --enable-multilib.
+    # Since that's the default, only pass --disable-multilib.
+    if [ "${CT_MULTILIB}" != "y" ]; then
+        extra_config+=("--disable-multilib")
+    else
+        extra_config+=("--enable-multiarch")
+        if [ -n "${CT_CC_GCC_MULTILIB_LIST}" ]; then
+            extra_config+=("--with-multilib-list=${CT_CC_GCC_MULTILIB_LIST}")
+        fi
+    fi
+
+    CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"
+
+    # We may need to modify host/build CFLAGS separately below
+    cflags_for_build="${cflags}"
+
+    # Clang's default bracket-depth is 256, and building GCC
+    # requires somewhere between 257 and 512.
+    if [ "${host}" = "${CT_BUILD}" ]; then
+        if ${CT_BUILD}-gcc --version 2>&1 | grep clang; then
+            cflags="$cflags "-fbracket-depth=512
+            cflags_for_build="$cflags_for_build "-fbracket-depth=512
+        fi
+    else
+        # FIXME we currently don't support clang as host compiler, only as build
+        if ${CT_BUILD}-gcc --version 2>&1 | grep clang; then
+            cflags_for_build="$cflags_for_build "-fbracket-depth=512
+        fi
+    fi
+
+    CT_DoExecLog CFG                                   \
+    CC_FOR_BUILD="${CT_BUILD}-gcc"                     \
+    CFLAGS="${cflags}"                                 \
+    CFLAGS_FOR_BUILD="${cflags_for_build}"             \
+    CXXFLAGS="${cflags}"                               \
+    CXXFLAGS_FOR_BUILD="${cflags_for_build}"           \
+    LDFLAGS="${final_LDFLAGS[*]}"                      \
+    CFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}"            \
+    CXXFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}"          \
+    LDFLAGS_FOR_TARGET="${CT_TARGET_LDFLAGS}"          \
+    ${CONFIG_SHELL}                                    \
+    "${CT_SRC_DIR}/gcc/configure"                      \
+        --build=${CT_BUILD}                            \
+        --host=${host}                                 \
+        --target=${CT_TARGET}                          \
+        --prefix="${prefix}"                           \
+        ${CC_SYSROOT_ARG}                              \
+        "${extra_config[@]}"                           \
+        --with-local-prefix="${CT_SYSROOT_DIR}"        \
+        --enable-long-long                             \
+        "${CT_CC_GCC_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 gcc compiler"
+    CT_DoExecLog ALL make ${JOBSFLAGS} all
+
+    # See the note on issues with parallel 'make install' in GCC above.
+    CT_DoLog EXTRA "Installing final gcc compiler"
+    if [ "${CT_STRIP_TARGET_TOOLCHAIN_EXECUTABLES}" = "y" ]; then
+        CT_DoExecLog ALL make install-strip
+    else
+        CT_DoExecLog ALL make install
+    fi
+
+    # Remove the libtool "pseudo-libraries": having them in the installed
+    # tree makes the libtoolized utilities that are built next assume
+    # that, for example, libsupc++ is an "accessory library", and not include
+    # -lsupc++ to the link flags. That breaks ltrace, for example.
+    CT_DoLog EXTRA "Housekeeping for final gcc compiler"
+    CT_Pushd "${prefix}"
+    find . -type f -name "*.la" -exec rm {} \; |CT_DoLog ALL
+    CT_Popd
+
+    if [ "${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 ${CT_TARGET}-${CT_CC} 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/${CT_TARGET}-${CT_CC}."* 2>/dev/null || true )"
+    [ -z "${file}" ] || ext=".${file##*.}"
+    if [ -f "${CT_PREFIX_DIR}/bin/${CT_TARGET}-${CT_CC}${ext}" ]; then
+        CT_DoExecLog ALL ln -sfv "${CT_TARGET}-${CT_CC}${ext}" "${prefix}/bin/${CT_TARGET}-cc${ext}"
+    fi
+
+    cc_gcc_multilib_housekeeping cc="${prefix}/bin/${CT_TARGET}-${CT_CC}" \
+        host="${host}"
+}