scripts/build/libc/glibc-eglibc.sh-common
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sat Jan 22 22:35:58 2011 +0100 (2011-01-22)
changeset 2276 ac021d186cd6
parent 2274 2f0e9d2cfce5
child 2277 71803c9f6de0
permissions -rw-r--r--
libc/glibc: add glibc specifics to the shared code, and use it

Final step at sharing code between glibc and eglibc.
Fall, wall of shame, fall!... :-)

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
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# This file contains the functions common to glibc and eglibc
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# Build and install headers file
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# This is a no-op
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do_libc_headers() {
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    :
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}
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# Build and install headers and start files
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do_libc_start_files() {
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    local src_dir="${CT_SRC_DIR}/${CT_LIBC}-${CT_LIBC_VERSION}"
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    CT_DoStep INFO "Installing C library headers / start files"
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    mkdir -p "${CT_BUILD_DIR}/build-libc-startfiles"
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    cd "${CT_BUILD_DIR}/build-libc-startfiles"
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    CT_DoLog EXTRA "Configuring C library"
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    case "${CT_LIBC}" in
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        eglibc)
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            if [ "${CT_EGLIBC_CUSTOM_CONFIG}" = "y" ]; then
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                CT_DoExecLog ALL cp "${CT_CONFIG_DIR}/eglibc.config" option-groups.config
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            fi
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            ;;
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    esac
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    cross_cc=$(CT_Which "${CT_TARGET}-gcc")
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    cross_cxx=$(CT_Which "${CT_TARGET}-g++")
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    cross_ar=$(CT_Which "${CT_TARGET}-ar")
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    cross_ranlib=$(CT_Which "${CT_TARGET}-ranlib")
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    CT_DoLog DEBUG "Using gcc for target: '${cross_cc}'"
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    CT_DoLog DEBUG "Using g++ for target: '${cross_cxx}'"
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    CT_DoLog DEBUG "Using ar for target: '${cross_ar}'"
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    CT_DoLog DEBUG "Using ranlib for target: '${cross_ranlib}'"
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    BUILD_CC="${CT_BUILD}-gcc"                          \
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    CC=${cross_cc}                                      \
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    CXX=${cross_cxx}                                    \
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    AR=${cross_ar}                                      \
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    RANLIB=${cross_ranlib}                              \
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    CT_DoExecLog CFG                                    \
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    "${src_dir}/configure"                              \
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        --prefix=/usr                                   \
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        --with-headers="${CT_HEADERS_DIR}"              \
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        --build="${CT_BUILD}"                           \
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        --host="${CT_TARGET}"                           \
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        --disable-profile                               \
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        --without-gd                                    \
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        --without-cvs                                   \
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        --enable-add-ons
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    CT_DoLog EXTRA "Installing C library headers"
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    # use the 'install-headers' makefile target to install the
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    # headers
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    CT_DoExecLog ALL                    \
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    make install-headers                \
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         install_root=${CT_SYSROOT_DIR} \
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         install-bootstrap-headers=yes
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    # For glibc, a few headers need to be manually installed
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    if [ "${CT_LIBC}" = "glibc" ]; then
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        # Two headers -- stubs.h and features.h -- aren't installed by install-headers,
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        # so do them by hand.  We can tolerate an empty stubs.h for the moment.
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        # See e.g. http://gcc.gnu.org/ml/gcc/2002-01/msg00900.html
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        mkdir -p "${CT_HEADERS_DIR}/gnu"
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        CT_DoExecLog ALL touch "${CT_HEADERS_DIR}/gnu/stubs.h"
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        CT_DoExecLog ALL cp -v "${CT_SRC_DIR}/glibc-${CT_LIBC_VERSION}/include/features.h"  \
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                               "${CT_HEADERS_DIR}/features.h"
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        # Building the bootstrap gcc requires either setting inhibit_libc, or
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        # having a copy of stdio_lim.h... see
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        # http://sources.redhat.com/ml/libc-alpha/2003-11/msg00045.html
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        CT_DoExecLog ALL cp -v bits/stdio_lim.h "${CT_HEADERS_DIR}/bits/stdio_lim.h"
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        # Following error building gcc-4.0.0's gcj:
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        #  error: bits/syscall.h: No such file or directory
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        # solved by following copy; see http://sourceware.org/ml/crossgcc/2005-05/msg00168.html
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        # but it breaks arm, see http://sourceware.org/ml/crossgcc/2006-01/msg00091.html
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        [ "${CT_ARCH}" != "arm" ] && CT_DoExecLog ALL cp -v misc/syscall-list.h "${CT_HEADERS_DIR}/bits/syscall.h" || true
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    fi
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    CT_DoLog EXTRA "Installing C library start files"
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    # there are a few object files needed to link shared libraries,
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    # which we build and install by hand
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    CT_DoExecLog ALL mkdir -p "${CT_SYSROOT_DIR}/usr/lib"
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    CT_DoExecLog ALL make csu/subdir_lib
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    CT_DoExecLog ALL cp csu/crt1.o csu/crti.o csu/crtn.o \
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                        "${CT_SYSROOT_DIR}/usr/lib"
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    # Finally, 'libgcc_s.so' requires a 'libc.so' to link against.
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    # However, since we will never actually execute its code,
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    # it doesn't matter what it contains.  So, treating '/dev/null'
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    # as a C source file, we produce a dummy 'libc.so' in one step
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    CT_DoExecLog ALL "${cross_cc}" -nostdlib        \
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                                   -nostartfiles    \
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                                   -shared          \
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                                   -x c /dev/null   \
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                                   -o "${CT_SYSROOT_DIR}/usr/lib/libc.so"
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    CT_EndStep
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}
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# This function builds and install the full C library
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do_libc() {
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    local src_dir="${CT_SRC_DIR}/${CT_LIBC}-${CT_LIBC_VERSION}"
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    local extra_cc_args
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    local -a extra_config
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    local -a extra_make_args
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    CT_DoStep INFO "Installing C library"
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    mkdir -p "${CT_BUILD_DIR}/build-libc"
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    cd "${CT_BUILD_DIR}/build-libc"
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    CT_DoLog EXTRA "Configuring C library"
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    case "${CT_LIBC}" in
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        eglibc)
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            if [ "${CT_EGLIBC_CUSTOM_CONFIG}" = "y" ]; then
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                CT_DoExecLog ALL cp "${CT_CONFIG_DIR}/eglibc.config" option-groups.config
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            fi
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            if [ "${CT_EGLIBC_OPT_SIZE}" = "y" ]; then
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                OPTIMIZE=-Os
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            else
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                OPTIMIZE=-O2
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            fi
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            ;;
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        glibc)
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            # glibc can't be built without -O2 (reference needed!)
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            OPTIMIZE=-O2
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            # Also, if those two are missing, iconv build breaks
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            extra_config+=( --disable-debug --disable-sanity-checks )
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            ;;
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    esac
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    # Add some default glibc config options if not given by user.
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    # We don't need to be conditional on wether the user did set different
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    # values, as they CT_LIBC_GLIBC_EXTRA_CONFIG is passed after extra_config
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    extra_config+=("$(do_libc_min_kernel_config)")
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    case "${CT_THREADS}" in
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        nptl)           extra_config+=("--with-__thread" "--with-tls");;
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        linuxthreads)   extra_config+=("--with-__thread" "--without-tls" "--without-nptl");;
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        none)           extra_config+=("--without-__thread" "--without-nptl")
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                        case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in
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                            *-tls*) ;;
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                            *) extra_config+=("--without-tls");;
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                        esac
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                        ;;
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    esac
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    case "${CT_SHARED_LIBS}" in
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        y) extra_config+=("--enable-shared");;
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        *) extra_config+=("--disable-shared");;
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    esac
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    case "${CT_ARCH_FLOAT_HW},${CT_ARCH_FLOAT_SW}" in
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        y,) extra_config+=("--with-fp");;
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        ,y) extra_config+=("--without-fp");;
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    esac
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    if [ "${CT_LIBC_DISABLE_VERSIONING}" = "y" ]; then
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        extra_config+=("--disable-versioning")
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    fi
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    if [ "${CT_LIBC_OLDEST_ABI}" != "" ]; then
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        extra_config+=("--enable-oldest-abi=${CT_LIBC_OLDEST_ABI}")
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    fi
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    case "$(do_libc_add_ons_list ,)" in
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        "") ;;
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        *)  extra_config+=("--enable-add-ons=$(do_libc_add_ons_list ,)");;
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    esac
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    extra_cc_args="${extra_cc_args} ${CT_ARCH_ENDIAN_OPT}"
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    # Pre-seed the configparms file with values from the config option
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    printf "${CT_LIBC_GLIBC_CONFIGPARMS}\n" > configparms
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    cross_cc=$(CT_Which "${CT_TARGET}-gcc")    
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    CT_DoLog DEBUG "Using gcc for target:     '${cross_cc}'"
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    CT_DoLog DEBUG "Configuring with addons : '$(do_libc_add_ons_list ,)'"
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    CT_DoLog DEBUG "Extra config args passed: '${extra_config[*]}'"
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    CT_DoLog DEBUG "Extra CC args passed    : '${extra_cc_args}'"
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    # ./configure is mislead by our tools override wrapper for bash
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    # so just tell it where the real bash is _on_the_target_!
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    # Notes:
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    # - ${ac_cv_path_BASH_SHELL} is only used to set BASH_SHELL
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    # - ${BASH_SHELL}            is only used to set BASH
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    # - ${BASH}                  is only used to set the shebang
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    #                            in two scripts to run on the target
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    # So we can safely bypass bash detection at compile time.
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    # Should this change in a future eglibc release, we'd better
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    # directly mangle the generated scripts _after_ they get built,
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    # or even after they get installed... eglibc is such a sucker...
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    echo "ac_cv_path_BASH_SHELL=/bin/bash" >config.cache
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    # Configure with --prefix the way we want it on the target...
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    # There are a whole lot of settings here.  You'll probably want
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    # to read up on what they all mean, and customize a bit, possibly by setting GLIBC_EXTRA_CONFIG
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    # Compare these options with the ones used when installing the glibc headers above - they're different.
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    # Adding "--without-gd" option to avoid error "memusagestat.c:36:16: gd.h: No such file or directory"
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    # See also http://sources.redhat.com/ml/libc-alpha/2000-07/msg00024.html.
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    # Set BUILD_CC, or we won't be able to build datafiles
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    BUILD_CC="${CT_BUILD}-gcc"                                      \
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    CFLAGS="${CT_TARGET_CFLAGS} ${CT_LIBC_GLIBC_EXTRA_CFLAGS} ${OPTIMIZE}"  \
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    CC="${CT_TARGET}-gcc ${CT_LIBC_EXTRA_CC_ARGS} ${extra_cc_args}" \
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    AR=${CT_TARGET}-ar                                              \
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    RANLIB=${CT_TARGET}-ranlib                                      \
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    CT_DoExecLog CFG                                                \
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    "${src_dir}/configure"                                          \
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        --prefix=/usr                                               \
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        --build=${CT_BUILD}                                         \
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        --host=${CT_TARGET}                                         \
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        --without-cvs                                               \
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        --disable-profile                                           \
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        --without-gd                                                \
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        --cache-file=config.cache                                   \
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        --with-headers="${CT_HEADERS_DIR}"                          \
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        "${extra_config[@]}"                                        \
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        ${CT_LIBC_GLIBC_EXTRA_CONFIG}
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    # build hacks
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    case "${CT_ARCH},${CT_ARCH_CPU}" in
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        powerpc,8??)
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            # http://sourceware.org/ml/crossgcc/2008-10/msg00068.html
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            CT_DoLog DEBUG "Activating support for memset on broken ppc-8xx (CPU15 erratum)"
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            extra_make_args+=( ASFLAGS="-DBROKEN_PPC_8xx_CPU15" )
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            ;;
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    esac
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    CT_DoLog EXTRA "Building C library"
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    CT_DoExecLog ALL make -j${CT_PARALLEL_JOBS}             \
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                          "${extra_make_args[@]}"           \
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                          all
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    CT_DoLog EXTRA "Installing C library"
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    CT_DoExecLog ALL make -j${CT_PARALLEL_JOBS}             \
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                          "${extra_make_args[@]}"           \
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                          install_root="${CT_SYSROOT_DIR}"  \
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                          install
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    CT_EndStep
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}
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# This function finishes the C library install
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# This is a no-op
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do_libc_finish() {
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    :
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}
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# Build up the addons list, separated with $1
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do_libc_add_ons_list() {
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    local sep="$1"
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    local addons_list="$( echo "${CT_LIBC_ADDONS_LIST}"         \
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                          |sed -r -e "s/[[:space:],]/${sep}/g;" \
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                        )"
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    case "${CT_THREADS}" in
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        none)   ;;
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        *)      addons_list="${addons_list}${sep}${CT_THREADS}";;
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    esac
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    [ "${CT_LIBC_GLIBC_USE_PORTS}" = "y" ] && addons_list="${addons_list}${sep}ports"
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    # Remove duplicate, leading and trailing separators
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    echo "${addons_list}" |sed -r -e "s/${sep}+/${sep}/g; s/^${sep}//; s/${sep}\$//;"
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}
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# Compute up the minimum supported Linux kernel version
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do_libc_min_kernel_config() {
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    local min_kernel_config
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    case "${CT_LIBC_GLIBC_EXTRA_CONFIG}" in
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        *--enable-kernel*) ;;
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        *)  if [ "${CT_LIBC_GLIBC_KERNEL_VERSION_AS_HEADERS}" = "y" ]; then
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                # We can't rely on the kernel version from the configuration,
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                # because it might not be available if the user uses pre-installed
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                # headers. On the other hand, both method will have the kernel
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                # version installed in "usr/include/linux/version.h" in the sys-root.
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                # Parse that instead of having two code-paths.
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                version_code_file="${CT_SYSROOT_DIR}/usr/include/linux/version.h"
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                if [ ! -f "${version_code_file}" -o ! -r "${version_code_file}" ]; then
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                    CT_Abort "Linux version is unavailable in installed headers files"
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                fi
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                version_code="$( grep -E LINUX_VERSION_CODE "${version_code_file}"  \
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                                 |cut -d ' ' -f 3                                   \
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                               )"
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                version=$(((version_code>>16)&0xFF))
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                patchlevel=$(((version_code>>8)&0xFF))
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                sublevel=$((version_code&0xFF))
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                min_kernel_config="${version}.${patchlevel}.${sublevel}"
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            elif [ "${CT_LIBC_GLIBC_KERNEL_VERSION_CHOSEN}" = "y" ]; then
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                # Trim the fourth part of the linux version, keeping only the first three numbers
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                min_kernel_config="$( echo "${CT_LIBC_GLIBC_MIN_KERNEL_VERSION}"            \
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                                      |sed -r -e 's/^([^.]+\.[^.]+\.[^.]+)(|\.[^.]+)$/\1/;' \
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                                    )"
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            fi
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            echo "--enable-kernel=${min_kernel_config}"
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            ;;
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    esac
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}