# This file adds functions to build glibc

 # Copyright 2007 Yann E. MORIN

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

 # Download glibc

 do_libc_get() {

    local date

     # Ah! Not all GNU folks seem stupid. All glibc releases are in the same

     # directory. Good. Alas, there is no snapshot there. I'll deal with them

     # later on... :-/

     # Update: sadly, glibc folks do be stupid: they no longer build

     # release tarballs as of glibc-2.8, hence forcing us to fetch

     # from CVS (CVS! Don't those guys know the world of SCM has

     # evolved since the dawn ages of CVS?) Sigh...

     if [ "${CT_LIBC_GLIBC_2_8_or_later}" = "y" ]; then

         # No release tarball available...

         date="${CT_LIBC_GLIBC_CVS_date}"

         CT_GetCVS "glibc-${CT_LIBC_VERSION}"                            \

                   ":pserver:anoncvs@sources.redhat.com:/cvs/glibc"      \

                   "libc"                                                \

                   "glibc-${CT_LIBC_VERSION}-branch${date:+:}${date}"    \

                   "glibc-${CT_LIBC_VERSION}"

         # C library addons

         for addon in $(do_libc_add_ons_list " "); do

             # NPTL addon is not to be downloaded, in any case

             [ "${addon}" = "nptl" ] && continue || true

             CT_GetCVS "glibc-${addon}-${CT_LIBC_VERSION}"                   \

                       ":pserver:anoncvs@sources.redhat.com:/cvs/glibc"      \

                       "${addon}"                                            \

                       "glibc-${CT_LIBC_VERSION}-branch${date:+:}${date}"    \

                       "glibc-${addon}-${CT_LIBC_VERSION}"

         done

     else

         # Release tarballs are available

         CT_GetFile "glibc-${CT_LIBC_VERSION}"               \

                    {ftp,http}://ftp.gnu.org/gnu/glibc       \

                    ftp://gcc.gnu.org/pub/glibc/releases     \

                    ftp://gcc.gnu.org/pub/glibc/snapshots

         # C library addons

         for addon in $(do_libc_add_ons_list " "); do

             # NPTL addon is not to be downloaded, in any case

             [ "${addon}" = "nptl" ] && continue || true

             CT_GetFile "glibc-${addon}-${CT_LIBC_VERSION}"      \

                        {ftp,http}://ftp.gnu.org/gnu/glibc       \

                        ftp://gcc.gnu.org/pub/glibc/releases     \

                        ftp://gcc.gnu.org/pub/glibc/snapshots

         done

     fi

     return 0

 }

 # Extract glibc

 do_libc_extract() {

     CT_Extract "glibc-${CT_LIBC_VERSION}"

     CT_Patch "glibc-${CT_LIBC_VERSION}"

     # C library addons

     for addon in $(do_libc_add_ons_list " "); do

         # NPTL addon is not to be extracted, in any case

         [ "${addon}" = "nptl" ] && continue || true

         CT_Pushd "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}"

         CT_Extract "glibc-${addon}-${CT_LIBC_VERSION}" nochdir

         # Some addons have the 'long' name, while others have the

         # 'short' name, but patches are non-uniformly built with

         # either the 'long' or 'short' name, whatever the addons name

         # so we have to make symlinks from the existing to the missing

         # Fortunately for us, [ -d foo ], when foo is a symlink to a

         # directory, returns true!

         [ -d "${addon}" ] || ln -s "glibc-${addon}-${CT_LIBC_VERSION}" "${addon}"

         [ -d "glibc-${addon}-${CT_LIBC_VERSION}" ] || ln -s "${addon}" "glibc-${addon}-${CT_LIBC_VERSION}"

         CT_Patch "glibc-${addon}-${CT_LIBC_VERSION}" nochdir

         CT_Popd

     done

     # The configure files may be older than the configure.in files

     # if using a snapshot (or even some tarballs). Fake them being

     # up to date.

     find "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}" -type f -name configure -exec touch {} \; 2>&1 |CT_DoLog ALL

     return 0

 }

 # There is nothing to do for glibc check config

 do_libc_check_config() {

     :

 }

 # This function installs the glibc headers needed to build the core compiler

 do_libc_headers() {

     CT_DoStep INFO "Installing C library headers"

     mkdir -p "${CT_BUILD_DIR}/build-libc-headers"

     cd "${CT_BUILD_DIR}/build-libc-headers"

     CT_DoLog EXTRA "Configuring C library"

     # The following three things have to be done to build glibc-2.3.x, but they don't hurt older versions.

     # 1. override CC to keep glibc's configure from using $TARGET-gcc. 

     # 2. disable linuxthreads, which needs a real cross-compiler to generate tcb-offsets.h properly

     # 3. build with gcc 3.2 or later

     # Compare these options with the ones used when building glibc for real below - they're different.

     # As of glibc-2.3.2, to get this step to work for hppa-linux, you need --enable-hacker-mode

     # so when configure checks to make sure gcc has access to the assembler you just built...

     # Alternately, we could put ${PREFIX}/${TARGET}/bin on the path.

     # Set --build so maybe we don't have to specify "cross-compiling=yes" below (haven't tried yet)

     # Note: the warning

     # "*** WARNING: Are you sure you do not want to use the `linuxthreads'"

     # *** add-on?"

     # is ok here, since all we want are the basic headers at this point.

     # Override libc_cv_ppc_machine so glibc-cvs doesn't complain

     # 'a version of binutils that supports .machine "altivec" is needed'.

     addons_list="$(do_libc_add_ons_list ,)"

     # We need to remove any threading addon when installing headers

     addons_list="${addons_list//nptl/}"

     addons_list="${addons_list//linuxthreads/}"

     # Remove duplicate, leading and trailing separators

     addons_config="--enable-add-ons=$(echo "${addons_list}" |sed -r -e 's/,+/,/; s/^,//; s/,$//g;')"

     extra_config="${addons_config} $(do_libc_min_kernel_config)"

     cross_cc=$(CT_Which "${CT_TARGET}-gcc")

     CT_DoLog DEBUG "Using gcc for target: '${cross_cc}'"

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

     libc_cv_ppc_machine=yes                             \

     CC=${cross_cc}                                      \

     CT_DoExecLog ALL                                    \

     "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/configure"  \

         --build="${CT_BUILD}"                           \

         --host="${CT_TARGET}"                           \

         --prefix=/usr                                   \

         --with-headers="${CT_HEADERS_DIR}"              \

         --without-cvs                                   \

         --disable-sanity-checks                         \

         --enable-hacker-mode                            \

         ${extra_config}                                 \

         --without-nptl

     CT_DoLog EXTRA "Installing C library headers"

     if grep -q GLIBC_2.3 "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/ChangeLog"; then

         # glibc-2.3.x passes cross options to $(CC) when generating errlist-compat.c,

         # which fails without a real cross-compiler.

         # Fortunately, we don't need errlist-compat.c, since we just need .h

         # files, so work around this by creating a fake errlist-compat.c and

         # satisfying its dependencies.

         # Another workaround might be to tell configure to not use any cross

         # options to $(CC).

         # The real fix would be to get install-headers to not generate

         # errlist-compat.c.

         # Note: BOOTSTRAP_GCC is used by:

         # patches/glibc-2.3.5/glibc-mips-bootstrap-gcc-header-install.patch

         libc_cv_ppc_machine=yes                         \

         CT_DoExecLog ALL                                \

         make CFLAGS="-O -DBOOTSTRAP_GCC"                \

              OBJDUMP_FOR_HOST="${CT_TARGET}-objdump"    \

              sysdeps/gnu/errlist.c

         mkdir -p stdio-common

         # sleep for 2 seconds for benefit of filesystems with lousy time

         # resolution, like FAT, so make knows for sure errlist-compat.c doesn't

         # need generating

         sleep 2

         CT_DoExecLog ALL touch stdio-common/errlist-compat.c

     fi

     # Note: BOOTSTRAP_GCC (see above)

     libc_cv_ppc_machine=yes                         \

     CT_DoExecLog ALL                                \

     make cross-compiling=yes                        \

          install_root=${CT_SYSROOT_DIR}             \

          CFLAGS="-O -DBOOTSTRAP_GCC"                \

          ${LIBC_SYSROOT_ARG}                        \

          OBJDUMP_FOR_HOST="${CT_TARGET}-objdump"    \

          install-headers

     # Two headers -- stubs.h and features.h -- aren't installed by install-headers,

     # so do them by hand.  We can tolerate an empty stubs.h for the moment.

     # See e.g. http://gcc.gnu.org/ml/gcc/2002-01/msg00900.html

     mkdir -p "${CT_HEADERS_DIR}/gnu"

     CT_DoExecLog ALL touch "${CT_HEADERS_DIR}/gnu/stubs.h"

     CT_DoExecLog ALL cp -v "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/include/features.h"  \

                            "${CT_HEADERS_DIR}/features.h"

     # Building the bootstrap gcc requires either setting inhibit_libc, or

     # having a copy of stdio_lim.h... see

     # http://sources.redhat.com/ml/libc-alpha/2003-11/msg00045.html

     CT_DoExecLog ALL cp -v bits/stdio_lim.h "${CT_HEADERS_DIR}/bits/stdio_lim.h"

     # Following error building gcc-4.0.0's gcj:

     #  error: bits/syscall.h: No such file or directory

     # solved by following copy; see http://sourceware.org/ml/crossgcc/2005-05/msg00168.html

     # but it breaks arm, see http://sourceware.org/ml/crossgcc/2006-01/msg00091.html

     [ "${CT_ARCH}" != "arm" ] && CT_DoExecLog ALL cp -v misc/syscall-list.h "${CT_HEADERS_DIR}/bits/syscall.h" || true

     # Those headers are to be manually copied so gcc can build properly

     pthread_h="${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/${CT_THREADS}/sysdeps/pthread/pthread.h"

     pthreadtypes_h=

     case "${CT_THREADS}" in

         nptl)

             # NOTE: for some archs, the pathes are different, but they are not

             # supported by crosstool-NG right now. See original crosstool when they are.

             pthread_h="${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/${CT_THREADS}/sysdeps/pthread/pthread.h"

             pthreadtypes_h="${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/nptl/sysdeps/unix/sysv/linux/${CT_KERNEL_ARCH}/bits/pthreadtypes.h"

             if [ ! -f "${pthreadtypes_h}" ]; then

                 pthreadtypes_h="${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/ports/sysdeps/unix/sysv/linux/${CT_KERNEL_ARCH}/nptl/bits/pthreadtypes.h"

             fi

             ;;

         linuxthreads)

             pthreadtypes_h="${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h"

             ;;

         *)

             pthread_h=

             pthreadtypes_h=

             ;;

     esac

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

         CT_DoExecLog ALL cp -v "${pthread_h}" "${CT_HEADERS_DIR}/pthread.h"

     fi

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

         CT_DoExecLog ALL cp -v "${pthreadtypes_h}" "${CT_HEADERS_DIR}/bits/pthreadtypes.h"

     fi

     CT_EndStep

 }

 # Build and install start files

 do_libc_start_files() {

     # Needed only in the NPTL case. Otherwise, return.

     [ "${CT_THREADS}" = "nptl" ] || return 0

     CT_DoStep INFO "Installing C library start files"

     mkdir -p "${CT_BUILD_DIR}/build-libc-startfiles"

     cd "${CT_BUILD_DIR}/build-libc-startfiles"

     CT_DoLog EXTRA "Configuring C library"

     # Add some default glibc config options if not given by user.

     extra_config=

     case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in

         *-tls*) ;;

         *) extra_config="${extra_config} --with-tls"

     esac

     case "${CT_SHARED_LIBS}" in

         y) extra_config="${extra_config} --enable-shared";;

         *) extra_config="${extra_config} --disable-shared";;

     esac

     case "${CT_ARCH_FLOAT_HW},${CT_ARCH_FLOAT_SW}" in

         y,) extra_config="${extra_config} --with-fp";;

         ,y) extra_config="${extra_config} --without-fp";;

     esac

     # Obviously, we want threads, as we come here only for NPTL

     extra_config="${extra_config} --with-__thread"

     addons_config="--enable-add-ons=$(do_libc_add_ons_list ,)"

     extra_config="${extra_config} ${addons_config}"

     extra_config="${extra_config} $(do_libc_min_kernel_config)"

     # Add some default CC args

     glibc_version_major=$(echo ${CT_LIBC_VERSION} |sed -r -e 's/^([[:digit:]]+).*/\1/')

     glibc_version_minor=$(echo ${CT_LIBC_VERSION} |sed -r -e 's/^[[:digit:]]+[\.-_]([[:digit:]]+).*/\1/')

     # In case we're using a snapshot, fake a >=2.6 version.

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

          -o "${CT_LIBC_V_date}" = "y"   ]; then

         glibc_version_major=3

         glibc_version_minor=0

     fi

     if [    ${glibc_version_major} -eq 2 -a ${glibc_version_minor} -ge 6    \

          -o ${glibc_version_major} -gt 2                                    ]; then

         # Don't use -pipe: configure chokes on it for glibc >= 2.6.

         CT_Test 'Removing "-pipe" for use with glibc>=2.6' "${CT_USE_PIPES}" = "y"

         extra_cc_args="${CT_CFLAGS_FOR_HOST/-pipe}"

     else

         extra_cc_args="${CT_CFLAGS_FOR_HOST}"

     fi

     extra_cc_args="${extra_cc_args} ${CT_ARCH_ENDIAN_OPT}"

     cross_cc=$(CT_Which "${CT_TARGET}-gcc")

     CT_DoLog DEBUG "Using gcc for target    : '${cross_cc}'"

     CT_DoLog DEBUG "Configuring with addons : '$(do_libc_add_ons_list ,)'"

     CT_DoLog DEBUG "Extra config args passed: '${extra_config}'"

     CT_DoLog DEBUG "Extra CC args passed    : '${extra_cc_args}'"

     # Super-H really needs to set configparms as of gcc-3.4/glibc-2.3.2

     # note: this is awkward, doesn't work well if you need more than one

     # line in configparms

     [ "${CT_ARCH_sh}" = "y" ] && echo "no-z-defs=yes" > configparms

     echo "libc_cv_forced_unwind=yes" > config.cache

     echo "libc_cv_c_cleanup=yes" >> config.cache

     # Please see the comment for the configure step in do_libc().

     BUILD_CC="${CT_BUILD}-gcc"                                      \

     CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} -O "  \

     CC="${cross_cc} ${CT_LIBC_EXTRA_CC_ARGS} ${extra_cc_args}"      \

     AR=${CT_TARGET}-ar                                              \

     RANLIB=${CT_TARGET}-ranlib                                      \

     CT_DoExecLog ALL                                                \

     "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/configure"              \

         --prefix=/usr                                               \

         --build="${CT_BUILD}"                                       \

         --host=${CT_TARGET}                                         \

         --without-cvs                                               \

         --disable-profile                                           \

         --disable-debug                                             \

         --without-gd                                                \

         --with-headers="${CT_HEADERS_DIR}"                          \

         --cache-file=config.cache                                   \

         ${extra_config}                                             \

         ${CT_LIBC_GLIBC_EXTRA_CONFIG}

     #TODO: should check whether slibdir has been set in configparms to */lib64

     #      and copy the startfiles into the appropriate libdir.

     CT_DoLog EXTRA "Building C library start files"

     CT_DoExecLog ALL make OBJDUMP_FOR_HOST="${CT_TARGET}-objdump" csu/subdir_lib

     CT_DoLog EXTRA "Installing C library start files"

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

         CT_DoExecLog ALL cp -fpv csu/crt[1in].o "${CT_SYSROOT_DIR}/usr/lib/"

     else

         CT_DoExecLog ALL cp -fpv csu/crt[1in].o "${CT_SYSROOT_DIR}/lib/"

     fi

     CT_EndStep

 }

 # This function builds and install the full glibc

 do_libc() {

     CT_DoStep INFO "Installing C library"

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

     cd "${CT_BUILD_DIR}/build-libc"

     CT_DoLog EXTRA "Configuring C library"

     # Add some default glibc config options if not given by user.

     # We don't need to be conditional on wether the user did set different

     # values, as they CT_LIBC_GLIBC_EXTRA_CONFIG is passed after extra_config

     extra_config=

     case "${CT_THREADS}" in

         nptl)           extra_config="${extra_config} --with-__thread --with-tls";;

         linuxthreads)   extra_config="${extra_config} --with-__thread --without-tls --without-nptl";;

         none)           extra_config="${extra_config} --without-__thread --without-nptl"

                         case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in

                             *-tls*) ;;

                             *) extra_config="${extra_config} --without-tls";;

                         esac

                         ;;

     esac

     case "${CT_SHARED_LIBS}" in

         y) extra_config="${extra_config} --enable-shared";;

         *) extra_config="${extra_config} --disable-shared";;

     esac

     case "${CT_ARCH_FLOAT_HW},${CT_ARCH_FLOAT_SW}" in

         y,) extra_config="${extra_config} --with-fp";;

         ,y) extra_config="${extra_config} --without-fp";;

     esac

     case "$(do_libc_add_ons_list ,)" in

         "") ;;

         *)  extra_config="${extra_config} --enable-add-ons=$(do_libc_add_ons_list ,)";;

     esac

     extra_config="${extra_config} $(do_libc_min_kernel_config)"

     # Add some default CC args

     glibc_version_major=$(echo ${CT_LIBC_VERSION} |sed -r -e 's/^([[:digit:]]+).*/\1/')

     glibc_version_minor=$(echo ${CT_LIBC_VERSION} |sed -r -e 's/^[[:digit:]]+[\.-_]([[:digit:]]+).*/\1/')

     # In case we're using a snapshot, fake a >=2.6 version.

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

          -o "${CT_LIBC_V_date}" = "y"   ]; then

         glibc_version_major=3

         glibc_version_minor=0

     fi

     if [    ${glibc_version_major} -eq 2 -a ${glibc_version_minor} -ge 6    \

          -o ${glibc_version_major} -gt 2                                    ]; then

         # Don't use -pipe: configure chokes on it for glibc >= 2.6.

         CT_Test 'Removing "-pipe" for use with glibc>=2.6' "${CT_USE_PIPES}" = "y"

         extra_cc_args="${CT_CFLAGS_FOR_HOST/-pipe}"

     else

         extra_cc_args="${CT_CFLAGS_FOR_HOST}"

     fi

     extra_cc_args="${extra_cc_args} ${CT_ARCH_ENDIAN_OPT}"

     cross_cc=$(CT_Which "${CT_TARGET}-gcc")

     CT_DoLog DEBUG "Using gcc for target    : '${cross_cc}'"

     CT_DoLog DEBUG "Configuring with addons : '$(do_libc_add_ons_list ,)'"

     CT_DoLog DEBUG "Extra config args passed: '${extra_config}'"

     CT_DoLog DEBUG "Extra CC args passed    : '${extra_cc_args}'"

     # sh3 and sh4 really need to set configparms as of gcc-3.4/glibc-2.3.2

     # note: this is awkward, doesn't work well if you need more than one line in configparms

     echo ${CT_LIBC_GLIBC_CONFIGPARMS} > configparms

     # For glibc 2.3.4 and later we need to set some autoconf cache

     # variables, because nptl/sysdeps/pthread/configure.in does not

     # work when cross-compiling.

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

         echo libc_cv_forced_unwind=yes

         echo libc_cv_c_cleanup=yes

     fi >config.cache

     # Configure with --prefix the way we want it on the target...

     # There are a whole lot of settings here.  You'll probably want

     # to read up on what they all mean, and customize a bit, possibly by setting GLIBC_EXTRA_CONFIG

     # Compare these options with the ones used when installing the glibc headers above - they're different.

     # Adding "--without-gd" option to avoid error "memusagestat.c:36:16: gd.h: No such file or directory" 

     # See also http://sources.redhat.com/ml/libc-alpha/2000-07/msg00024.html. 

     # Set BUILD_CC, or you won't be able to build datafiles

     # Set --build, else glibc-2.3.2 will think you're not cross-compiling, and try to run the test programs

     # OK. I'm fed up with those folks telling me what I should do.

     # I don't configure nptl? Well, maybe that's purposedly because

     # I don't want nptl! --disable-sanity-checks will shut up those

     # silly messages. GNU folks again, he?

     BUILD_CC="${CT_BUILD}-gcc"                                      \

     CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} -O"   \

     CC="${CT_TARGET}-gcc ${CT_LIBC_EXTRA_CC_ARGS} ${extra_cc_args}" \

     AR=${CT_TARGET}-ar                                              \

     RANLIB=${CT_TARGET}-ranlib                                      \

     CT_DoExecLog ALL                                                \

     "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/configure"              \

         --prefix=/usr                                               \

         --build=${CT_BUILD}                                         \

         --host=${CT_TARGET}                                         \

         --without-cvs                                               \

         --disable-profile                                           \

         --disable-debug                                             \

         --without-gd                                                \

         --disable-sanity-checks                                     \

         --cache-file=config.cache                                   \

         --with-headers="${CT_HEADERS_DIR}"                          \

         ${extra_config}                                             \

         ${CT_LIBC_GLIBC_EXTRA_CONFIG}

     if grep -l '^install-lib-all:' "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/Makerules" > /dev/null; then

         # nptl-era glibc.

         # If the install-lib-all target (which is added by our make-install-lib-all.patch)

         # is present, it means we're building glibc-2.3.3 or later, and we can't

         # build programs yet, as they require libeh, which won't be installed

         # until full build of gcc

         # YEM-FIXME: This comment is misleading: latest glibc-s do not have the

         #            make-install-lib-all.patch applied, so do not pass through this

         #            part of the if statement; nonetheless, they do build, and

         #            the result is useable (maybe the dual-pass core gcc is

         #            responsible for this).

         GLIBC_INITIAL_BUILD_RULE=lib

         GLIBC_INITIAL_INSTALL_RULE="install-lib-all install-headers"

         GLIBC_INSTALL_APPS_LATER=yes

     else

         # classic glibc.  

         # We can build and install everything with the bootstrap compiler.

         # YEM-FIXME: See the above FIXME as well.

         GLIBC_INITIAL_BUILD_RULE=all

         GLIBC_INITIAL_INSTALL_RULE=install

         GLIBC_INSTALL_APPS_LATER=no

     fi

     # glibc initial build hacks

     # http://sourceware.org/ml/crossgcc/2008-10/msg00068.html

     case "${CT_ARCH},${CT_ARCH_CPU}" in

 	powerpc,8??)

 	    CT_DoLog DEBUG "Activating support for memset on broken ppc-8xx (CPU15 erratum)"

 	    GLIBC_INITIAL_BUILD_ASFLAGS="-DBROKEN_PPC_8xx_CPU15";;

     esac

     # If this fails with an error like this:

     # ...  linux/autoconf.h: No such file or directory 

     # then you need to set the KERNELCONFIG variable to point to a .config file for this arch.

     # The following architectures are known to need kernel .config: alpha, arm, ia64, s390, sh, sparc

     # Note: LD and RANLIB needed by glibc-2.1.3's c_stub directory, at least on macosx

     # No need for PARALLELMFLAGS here, Makefile already reads this environment variable

     CT_DoLog EXTRA "Building C library"

     CT_DoExecLog ALL make LD=${CT_TARGET}-ld                        \

                            RANLIB=${CT_TARGET}-ranlib               \

                            OBJDUMP_FOR_HOST="${CT_TARGET}-objdump"  \

                            ASFLAGS="${GLIBC_INITIAL_BUILD_ASFLAGS}" \

                            ${GLIBC_INITIAL_BUILD_RULE}

     CT_DoLog EXTRA "Installing C library"

     CT_DoExecLog ALL make install_root="${CT_SYSROOT_DIR}"          \

                           ${LIBC_SYSROOT_ARG}                       \

                           OBJDUMP_FOR_HOST="${CT_TARGET}-objdump"   \

                           ${GLIBC_INITIAL_INSTALL_RULE}

     # This doesn't seem to work when building a crosscompiler,

     # as it tries to execute localedef using the just-built ld.so!?

     #CT_DoLog EXTRA "Installing locales"

     #make localedata/install-locales install_root=${SYSROOT} 2>&1 |CT_DoLog ALL

     # Fix problems in linker scripts.

     #

     # Remove lines containing BUG per http://sources.redhat.com/ml/bug-glibc/2003-05/msg00055.html,

     # needed to fix gcc-3.2.3/glibc-2.3.2 targeting arm

     # No need to look into the lib64/ dirs here and there, they point to the

     # corresponding lib/ directories.

     #

     # To make "strip *.so.*" not fail (ptxdist does this), rename to .so_orig rather than .so.orig

     CT_DoLog EXTRA "Fixing C library linker scripts"

     for file in libc.so libpthread.so libgcc_s.so; do

         for dir in lib usr/lib; do

             if [ -f "${CT_SYSROOT_DIR}/${dir}/${file}" -a ! -L ${CT_SYSROOT_DIR}/$lib/$file ]; then

                 CT_DoExecLog ALL cp -v "${CT_SYSROOT_DIR}/${dir}/${file}" "${CT_SYSROOT_DIR}/${dir}/${file}_orig"

                 CT_DoLog DEBUG "Fixing '${CT_SYS_ROOT_DIR}/${dir}/${file}'"

                 CT_DoExecLog ALL sed -i -r -e '/BUG in libc.scripts.output-format.sed/d' "${CT_SYSROOT_DIR}/${dir}/${file}"

             fi

         done

     done

     CT_EndStep

 }

 # This function finishes the glibc install

 do_libc_finish() {

     # Finally, build and install glibc programs, now that libeh (if any) is installed

     # Don't do this unless needed, 'cause it causes glibc-2.{1.3,2.2} to fail here with

     # .../gcc-3.4.1-glibc-2.1.3/build-glibc/libc.so.6: undefined reference to `__deregister_frame_info'

     # .../gcc-3.4.1-glibc-2.1.3/build-glibc/libc.so.6: undefined reference to `__register_frame_info'

     [ "${GLIBC_INSTALL_APPS_LATER}" = "yes" ] || return 0

     CT_DoStep INFO "Finishing C library"

     cd "${CT_BUILD_DIR}/build-libc"

     CT_DoLog EXTRA "Re-building C library"

     CT_DoExecLog ALL make LD=${CT_TARGET}-ld RANLIB=${CT_TARGET}-ranlib

     CT_DoLog EXTRA "Installing missing C library components"

     # note: should do full install and then fix linker scripts, but this is faster

     for t in bin rootsbin sbin data others; do

         CT_DoExecLog ALL make install_root="${CT_SYSROOT_DIR}"          \

                               ${LIBC_SYSROOT_ARG}                       \

                               OBJDUMP_FOR_HOST="${CT_TARGET}-objdump"   \

                               install-${t}

     done

     CT_EndStep

 }

 # Build up the addons list, separated with $1

 do_libc_add_ons_list() {

     local sep="$1"

     local addons_list=$(echo "${CT_LIBC_ADDONS_LIST}" |sed -r -e "s/[ ,]/${sep}/g;")

     case "${CT_THREADS}" in

         none)   ;;

         *)      addons_list="${addons_list}${sep}${CT_THREADS}";;

     esac

     [ "${CT_LIBC_GLIBC_USE_PORTS}" = "y" ] && addons_list="${addons_list}${sep}ports"

     # Remove duplicate, leading and trailing separators

     echo "${addons_list}" |sed -r -e "s/${sep}+/${sep}/g; s/^${sep}//; s/${sep}\$//;"

 }

 # Builds up the minimum supported Linux kernel version

 do_libc_min_kernel_config() {

     local min_kernel_config=

     case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in

         *enable-kernel*) ;;

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

                 # We can't rely on the kernel version from the configuration,

                 # because it might not be available if the user uses pre-installed

                 # headers. On the other hand, both method will have the kernel

                 # version installed in "usr/include/linux/version.h" in the sys-root.

                 # Parse that instead of having two code-paths.

                 version_code_file="${CT_SYSROOT_DIR}/usr/include/linux/version.h"

                 CT_TestOrAbort "Linux version is unavailable in installed headers files" -f "${version_code_file}" -a -r "${version_code_file}"

                 version_code=$(grep -E LINUX_VERSION_CODE "${version_code_file}" |cut -d ' ' -f 3)

                 version=$(((version_code>>16)&0xFF))

                 patchlevel=$(((version_code>>8)&0xFF))

                 sublevel=$((version_code&0xFF))

                 min_kernel_config="--enable-kernel=${version}.${patchlevel}.${sublevel}"

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

                 # Trim the fourth part of the linux version, keeping only the first three numbers

                 min_kernel_config="--enable-kernel=$(echo ${CT_LIBC_GLIBC_MIN_KERNEL_VERSION} |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;')"

             fi

             ;;

     esac

     echo "${min_kernel_config}"

 }