# This file contains the functions common to glibc and eglibc

 # Extract the C library tarball(s)

 do_libc_extract() {

     local addon

     # Extract the main tarball

     CT_Extract "${CT_LIBC}-${CT_LIBC_VERSION}"

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

     CT_Patch nochdir "${CT_LIBC}" "${CT_LIBC_VERSION}"

     # Extract the add-opns

     for addon in $(do_libc_add_ons_list " "); do

         # If the addon was bundled with the main archive, we do not

         # need to extract it. Worse, if we were to try to extract

         # it, we'd get an error.

         if [ -d "${addon}" ]; then

             CT_DoLog DEBUG "Add-on already present, spkipping extraction"

             continue

         fi

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

         CT_TestAndAbort "Error in add-on '${addon}': both short and long names in tarball" \

             -d "${addon}" -a -d "${CT_LIBC}-${addon}-${CT_LIBC_VERSION}"

         # 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

         # but we prefer the 'short' name and avoid duplicates.

         if [ -d "${CT_LIBC}-${addon}-${CT_LIBC_VERSION}" ]; then

             mv "${CT_LIBC}-${addon}-${CT_LIBC_VERSION}" "${addon}"

         fi

         ln -s "${addon}" "${CT_LIBC}-${addon}-${CT_LIBC_VERSION}"

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

         # Remove the long name since it can confuse configure scripts to run

         # the same source twice.

         rm "${CT_LIBC}-${addon}-${CT_LIBC_VERSION}"

     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 . -type f -name configure -exec touch {} \; 2>&1 |CT_DoLog ALL

     CT_Popd

 }

 # Build and install headers and start files

 do_libc_start_files() {

     # Start files and Headers should be configured the same way as the

     # final libc, but built and installed differently.

     do_libc_backend libc_mode=startfiles

 }

 # This function builds and install the full C library

 do_libc() {

     do_libc_backend libc_mode=final

 }

 do_libc_backend() {

     local src_dir="${CT_SRC_DIR}/${CT_LIBC}-${CT_LIBC_VERSION}"

     local libc_mode=final

     local extra_cc_args

     local -a extra_config

     local -a extra_make_args

     local glibc_cflags

     while [ $# -ne 0 ]; do

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

         shift

     done

     if [ "${libc_mode}" = "startfiles" ]; then

         CT_DoStep INFO "Installing C library headers & start files"

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

         cd "${CT_BUILD_DIR}/build-libc-start-files"

     else # libc_mode = final

         CT_DoStep INFO "Installing C library"

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

         cd "${CT_BUILD_DIR}/build-libc"

     fi

     CT_DoLog EXTRA "Configuring C library"

     case "${CT_LIBC}" in

         eglibc)

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

                 CT_DoExecLog ALL cp "${CT_CONFIG_DIR}/eglibc.config" option-groups.config

             fi

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

                 OPTIMIZE=-Os

             else

                 OPTIMIZE=-O2

             fi

             ;;

         glibc)

             # glibc can't be built without -O2 (reference needed!)

             OPTIMIZE=-O2

             # Also, if those two are missing, iconv build breaks

             extra_config+=( --disable-debug --disable-sanity-checks )

             ;;

     esac

     # 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_ARRAY is passed after

     # extra_config

     extra_config+=("$(do_libc_min_kernel_config)")

     case "${CT_THREADS}" in

         nptl)           extra_config+=("--with-__thread" "--with-tls");;

         linuxthreads)   extra_config+=("--with-__thread" "--without-tls" "--without-nptl");;

         none)           extra_config+=("--without-__thread" "--without-nptl")

                         case "${CT_LIBC_GLIBC_EXTRA_CONFIG_ARRAY[*]}" in

                             *-tls*) ;;

                             *) extra_config+=("--without-tls");;

                         esac

                         ;;

     esac

     case "${CT_SHARED_LIBS}" in

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

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

     esac

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

         y,) extra_config+=("--with-fp");;

         ,y) extra_config+=("--without-fp");;

     esac

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

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

     fi

     if [ "${CT_LIBC_OLDEST_ABI}" != "" ]; then

         extra_config+=("--enable-oldest-abi=${CT_LIBC_OLDEST_ABI}")

     fi

     case "$(do_libc_add_ons_list ,)" in

         "") ;;

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

     esac

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

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

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

     fi

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

     touch config.cache

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

         echo "libc_cv_forced_unwind=yes" >>config.cache

         echo "libc_cv_c_cleanup=yes" >>config.cache

     fi

     # Pre-seed the configparms file with values from the config option

     printf "${CT_LIBC_GLIBC_CONFIGPARMS}\n" > configparms

     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}'"

     glibc_cflags="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} ${OPTIMIZE}"

     case "${CT_LIBC_ENABLE_FORTIFIED_BUILD}" in

         y)  ;;

         *)  glibc_cflags+=" -U_FORTIFY_SOURCE";;

     esac

     # ./configure is mislead by our tools override wrapper for bash

     # so just tell it where the real bash is _on_the_target_!

     # Notes:

     # - ${ac_cv_path_BASH_SHELL} is only used to set BASH_SHELL

     # - ${BASH_SHELL}            is only used to set BASH

     # - ${BASH}                  is only used to set the shebang

     #                            in two scripts to run on the target

     # So we can safely bypass bash detection at compile time.

     # Should this change in a future eglibc release, we'd better

     # directly mangle the generated scripts _after_ they get built,

     # or even after they get installed... eglibc is such a sucker...

     echo "ac_cv_path_BASH_SHELL=/bin/bash" >>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_ARRAY

     # 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 we won't be able to build datafiles

     CT_DoExecLog CFG                                                \

     BUILD_CC="${CT_BUILD}-gcc"                                      \

     CFLAGS="${glibc_cflags}"                                        \

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

     AR=${CT_TARGET}-ar                                              \

     RANLIB=${CT_TARGET}-ranlib                                      \

     "${src_dir}/configure"                                          \

         --prefix=/usr                                               \

         --build=${CT_BUILD}                                         \

         --host=${CT_TARGET}                                         \

         --cache-file="$(pwd)/config.cache"                          \

         --without-cvs                                               \

         --disable-profile                                           \

         --without-gd                                                \

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

         "${extra_config[@]}"                                        \

         "${CT_LIBC_GLIBC_EXTRA_CONFIG_ARRAY[@]}"

     # build hacks

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

         powerpc,8??)

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

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

             extra_make_args+=( ASFLAGS="-DBROKEN_PPC_8xx_CPU15" )

             ;;

     esac

     if [ "${libc_mode}" = "startfiles" ]; then

         CT_DoLog EXTRA "Installing C library headers"

         # use the 'install-headers' makefile target to install the

         # headers

         CT_DoExecLog ALL make ${JOBSFLAGS}              \

                          install_root=${CT_SYSROOT_DIR} \

                          install-bootstrap-headers=yes  \

                          "${extra_make_args[@]}"        \

                          install-headers

         # For glibc, a few headers need to be manually installed

         if [ "${CT_LIBC}" = "glibc" ]; then

             # 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

             case "${CT_ARCH}" in

                 arm)    ;;

                 *)  CT_DoExecLog ALL cp -v "misc/syscall-list.h"            \

                                            "${CT_HEADERS_DIR}/bits/syscall.h"

                     ;;

             esac

         fi

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

             CT_DoLog EXTRA "Installing C library start files"

             # there are a few object files needed to link shared libraries,

             # which we build and install by hand

             CT_DoExecLog ALL mkdir -p "${CT_SYSROOT_DIR}/usr/lib"

             CT_DoExecLog ALL make ${JOBSFLAGS}  \

                         "${extra_make_args[@]}" \

                         csu/subdir_lib

             CT_DoExecLog ALL cp csu/crt1.o csu/crti.o csu/crtn.o \

                                 "${CT_SYSROOT_DIR}/usr/lib"

             # Finally, 'libgcc_s.so' requires a 'libc.so' to link against.

             # However, since we will never actually execute its code,

             # it doesn't matter what it contains.  So, treating '/dev/null'

             # as a C source file, we produce a dummy 'libc.so' in one step

             CT_DoExecLog ALL "${cross_cc}" -nostdlib        \

                                            -nostartfiles    \

                                            -shared          \

                                            -x c /dev/null   \

                                            -o "${CT_SYSROOT_DIR}/usr/lib/libc.so"

         fi # threads == nptl

     else # libc_mode = final

         CT_DoLog EXTRA "Building C library"

         CT_DoExecLog ALL make ${JOBSFLAGS}                      \

                               "${extra_make_args[@]}"           \

                               all

         CT_DoLog EXTRA "Installing C library"

         CT_DoExecLog ALL make ${JOBSFLAGS}                      \

                               "${extra_make_args[@]}"           \

                               install_root="${CT_SYSROOT_DIR}"  \

                               install

     fi

     CT_EndStep

 }

 # This function finishes the C library install

 # This is a no-op

 do_libc_finish() {

     :

 }

 # 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/[[:space:],]/${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}\$//;"

 }

 # Compute up the minimum supported Linux kernel version

 do_libc_min_kernel_config() {

     local min_kernel_config

     case "${CT_LIBC_GLIBC_EXTRA_CONFIG_ARRAY[*]}" 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 sysroot.

                 # Parse that instead of having two code-paths.

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

                 if [ ! -f "${version_code_file}" -o ! -r "${version_code_file}" ]; then

                     CT_Abort "Linux version is unavailable in installed headers files"

                 fi

                 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="${version}.${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="$( echo "${CT_LIBC_GLIBC_MIN_KERNEL_VERSION}"            \

                                       |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;' \

                                     )"

             fi

             echo "--enable-kernel=${min_kernel_config}"

             ;;

     esac

 }