# This file contains the functions common to glibc and eglibc

# Build and install headers file
# This is a no-op
do_libc_headers() {
    :
}

# Build and install headers and start files
do_libc_start_files() {
    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"

    if [ "${CT_EGLIBC_CUSTOM_CONFIG}" = "y" ]; then
        CT_DoExecLog ALL cp "${CT_CONFIG_DIR}/eglibc.config" option-groups.config
    fi

    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}'"

    BUILD_CC="${CT_BUILD}-gcc"                          \
    CC=${cross_cc}                                      \
    CXX=${cross_cxx}                                    \
    AR=${cross_ar}                                      \
    RANLIB=${cross_ranlib}                              \
    CT_DoExecLog CFG                                    \
    "${CT_SRC_DIR}/eglibc-${CT_LIBC_VERSION}/configure" \
        --prefix=/usr                                   \
        --with-headers="${CT_HEADERS_DIR}"              \
        --build="${CT_BUILD}"                           \
        --host="${CT_TARGET}"                           \
        --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 install-headers                \
         install_root=${CT_SYSROOT_DIR} \
         install-bootstrap-headers=yes

    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 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 -a extra_config

    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"

    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

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

    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}"

    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

    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=${CT_TARGET}-ranlib                                      \
    CT_DoExecLog CFG                                                \
    "${CT_SRC_DIR}/eglibc-${CT_LIBC_VERSION}/configure"             \
        --prefix=/usr                                               \
        --with-headers="${CT_HEADERS_DIR}"                          \
        --build=${CT_BUILD}                                         \
        --host=${CT_TARGET}                                         \
        --disable-profile                                           \
        --without-gd                                                \
        --without-cvs                                               \
        --cache-file=config.cache                                   \
        "${extra_config[@]}"                                        \
        ${CT_LIBC_GLIBC_EXTRA_CONFIG}
    
    CT_DoLog EXTRA "Building C library"

    # eglibc 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)"
            EGLIBC_BUILD_ASFLAGS="-DBROKEN_PPC_8xx_CPU15";;
    esac

    CT_DoExecLog ALL make ASFLAGS="${EGLIBC_BUILD_ASFLAGS}"

    CT_DoLog EXTRA "Installing C library"

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

    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 "${CT_LIBC_ADDONS_LIST//,/${sep}}" |tr -s ,)
    case "${CT_THREADS}" in
        none)   ;;
        *)      addons_list="${addons_list}${sep}${CT_THREADS}";;
    esac
    [ "${CT_LIBC_GLIBC_USE_PORTS}" = "y" ] && addons_list="${addons_list}${sep}ports"
    addons_list="${addons_list%%${sep}}"
    echo "${addons_list##${sep}}"
}