# This file contains the functions common to glibc and eglibc

 # Build and install headers and start files

 do_libc_start_files() {

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

     CT_DoStep INFO "Installing C library headers & start files"

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

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

     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

             ;;

     esac

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

     cross_cxx=$(CT_Which "${CT_TARGET}-g++")

     cross_ar=$(CT_Which "${CT_TARGET}-ar")

     cross_ranlib=$(CT_Which "${CT_TARGET}-ranlib")

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

     CT_DoLog DEBUG "Using g++ for target: '${cross_cxx}'"

     CT_DoLog DEBUG "Using ar for target: '${cross_ar}'"

     CT_DoLog DEBUG "Using ranlib for target: '${cross_ranlib}'"

     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

     BUILD_CC="${CT_BUILD}-gcc"                          \

     CC=${cross_cc}                                      \

     CXX=${cross_cxx}                                    \

     AR=${cross_ar}                                      \

     RANLIB=${cross_ranlib}                              \

     CT_DoExecLog CFG                                    \

     "${src_dir}/configure"                              \

         --prefix=/usr                                   \

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

         --build="${CT_BUILD}"                           \

         --host="${CT_TARGET}"                           \

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

         --disable-profile                               \

         --without-gd                                    \

         --without-cvs                                   \

         --enable-add-ons

     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  \

                      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

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

     fi

     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} 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"

     CT_EndStep

 }

 # This function builds and install the full C library

 do_libc() {

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

     local extra_cc_args

     local -a extra_config

     local -a extra_make_args

     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"

     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 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}" 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

     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}'"

     # ./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

     # 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

     BUILD_CC="${CT_BUILD}-gcc"                                      \

     CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} ${OPTIMIZE}"  \

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

     AR=${CT_TARGET}-ar                                              \

     RANLIB=${CT_TARGET}-ranlib                                      \

     CT_DoExecLog CFG                                                \

     "${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}

     # 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

     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

     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}" 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

 }