# 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

}