Text 19806, 1412 rader
Skriven 2018-08-04 23:16:56 av Benny Pedersen (2:230/0)
  Kommentar till text 19803 av Little Mikey (1:153/7001)
Ärende: Beware; for I am fearless, and therefore powerful.
==========================================================
Hello Little!

03 Aug 2018 21:14, Little Mikey wrote to Benny Pedersen:

 BP>> i have glibc from truck github if i want to use it, there is no
 BP>> safe way back if emerged

 LM> Understood.  glibc is the trickiest package to upgrade since 
 LM> everything relies on it.

+1

 LM> That is why special partitions are deployed 
 LM> here for experimenting with glibc.

how is the layout with it ?

lvm2 snapshot rollbacks ?

 LM> Having said that, this reply is 
 LM> being entered on a booted rootfs based on glibc-2.28 with a 
 LM> bootstrapped gcc-8.2.0 and at this writing a linux-4.17.11 kernel.  
 LM> The original post you are replying to was also from this same rootfs.

i could do this on gentoo, i know enough to hack this with gentoo portage, but
i dont know how cold it could be on the maunting top :)

 BP>> could you test this ? :)
 LM> Do you mean the gentoo package?

   ----- glibc-9999.ebuild begins -----
# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

EAPI=6

inherit prefix eutils versionator toolchain-funcs flag-o-matic gnuconfig \
        multilib systemd multiprocessing

DESCRIPTION="GNU libc C library"
HOMEPAGE="https://www.gnu.org/software/libc/"
LICENSE="LGPL-2.1+ BSD HPND ISC inner-net rc PCRE"
RESTRICT="strip" # Strip ourself #46186
SLOT="2.2"

EMULTILIB_PKG="true"

if [[ ${PV} == 9999* ]]; then
        EGIT_REPO_URI="https://sourceware.org/git/glibc.git"
        inherit git-r3
else
        # KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc
~ppc64 ~s390 ~sh ~sparc ~x86"
        KEYWORDS=""
        SRC_URI="mirror://gnu/glibc/${P}.tar.xz"
fi

RELEASE_VER=${PV}

GCC_BOOTSTRAP_VER=20180511

# Gentoo patchset
PATCH_VER=7

SRC_URI+="
https://dev.gentoo.org/~dilfridge/distfiles/${P}-patches-${PATCH_VER}.tar.bz2"
SRC_URI+=" multilib? (
https://dev.gentoo.org/~dilfridge/distfiles/gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz
)"

IUSE="audit caps cet compile-locales doc gd hardened headers-only +multiarch
multilib nscd profile selinux suid systemtap test vanilla"

# Minimum kernel version that glibc requires
MIN_KERN_VER="3.2.0"

# Here's how the cross-compile logic breaks down ...
#  CTARGET - machine that will target the binaries
#  CHOST   - machine that will host the binaries
#  CBUILD  - machine that will build the binaries
# If CTARGET != CHOST, it means you want a libc for cross-compiling.
# If CHOST != CBUILD, it means you want to cross-compile the libc.
#  CBUILD = CHOST = CTARGET    - native build/install
#  CBUILD != (CHOST = CTARGET) - cross-compile a native build
#  (CBUILD = CHOST) != CTARGET - libc for cross-compiler
#  CBUILD != CHOST != CTARGET  - cross-compile a libc for a cross-compiler
# For install paths:
#  CHOST = CTARGET  - install into /
#  CHOST != CTARGET - install into /usr/CTARGET/
#
export CBUILD=${CBUILD:-${CHOST}}
export CTARGET=${CTARGET:-${CHOST}}
if [[ ${CTARGET} == ${CHOST} ]] ; then
        if [[ ${CATEGORY} == cross-* ]] ; then
                export CTARGET=${CATEGORY#cross-}
        fi
fi

# We need a new-enough binutils/gcc to match upstream baseline.
# Also we need to make sure our binutils/gcc supports TLS.
COMMON_DEPEND="
        nscd? ( selinux? (
                audit? ( sys-process/audit )
                caps? ( sys-libs/libcap )
        ) )
        suid? ( caps? ( sys-libs/libcap ) )
        selinux? ( sys-libs/libselinux )
        systemtap? ( dev-util/systemtap )
"
DEPEND="${COMMON_DEPEND}
        >=app-misc/pax-utils-0.1.10
        sys-devel/bison
        !<sys-apps/sandbox-1.6
        !<sys-apps/portage-2.1.2
        !<sys-devel/bison-2.7
        !<sys-devel/make-4
        doc? ( sys-apps/texinfo )
        test? ( >=net-dns/libidn2-2.0.5 )
"
RDEPEND="${COMMON_DEPEND}
        >=net-dns/libidn2-2.0.5
        sys-apps/gentoo-functions
        !sys-kernel/ps3-sources
        !sys-libs/nss-db
"

if [[ ${CATEGORY} == cross-* ]] ; then
        DEPEND+=" !headers-only? (
                >=${CATEGORY}/binutils-2.24
                >=${CATEGORY}/gcc-4.9
        )"
        [[ ${CATEGORY} == *-linux* ]] && DEPEND+=" ${CATEGORY}/linux-headers"
else
        DEPEND+="
                >=sys-devel/binutils-2.24
                >=sys-devel/gcc-4.9
                virtual/os-headers
        "
        RDEPEND+=" vanilla? ( !sys-libs/timezone-data )"
        PDEPEND+=" !vanilla? ( sys-libs/timezone-data )"
fi

#
# Small helper functions
#

is_crosscompile() {
        [[ ${CHOST} != ${CTARGET} ]]
}

just_headers() {
        is_crosscompile && use headers-only
}

alt_prefix() {
        is_crosscompile && echo /usr/${CTARGET}
}

# We need to be able to set alternative headers for compiling for non-native
# platform. Will also become useful for testing kernel-headers without screwing
# up the whole system.
alt_headers() {
        echo ${ALT_HEADERS:=$(alt_prefix)/usr/include}
}

alt_build_headers() {
        if [[ -z ${ALT_BUILD_HEADERS} ]] ; then
                ALT_BUILD_HEADERS="${EPREFIX}$(alt_headers)"
                if tc-is-cross-compiler ; then
                        ALT_BUILD_HEADERS=${SYSROOT}$(alt_headers)
                        if [[ ! -e ${ALT_BUILD_HEADERS}/linux/version.h ]] ;
then
                                local header_path=$(echo '#include
<linux/version.h>' | $(tc-getCPP ${CTARGET}) ${CFLAGS} 2>&1 | grep -o
'[^"]*linux/version.h')
                               
ALT_BUILD_HEADERS=${header_path%/linux/version.h}
                        fi
                fi
        fi
        echo "${ALT_BUILD_HEADERS}"
}

alt_libdir() {
        echo $(alt_prefix)/$(get_libdir)
}
alt_usrlibdir() {
        echo $(alt_prefix)/usr/$(get_libdir)
}

builddir() {
        echo "${WORKDIR}/build-${ABI}-${CTARGET}-$1"
}

do_compile_test() {
        local ret save_cflags=${CFLAGS}
        CFLAGS+=" $1"
        shift

        pushd "${T}" >/dev/null

        rm -f glibc-test*
        printf '%b' "$*" > glibc-test.c

        nonfatal emake -s glibc-test
        ret=$?

        popd >/dev/null

        CFLAGS=${save_cflags}
        return ${ret}
}

do_run_test() {
        local ret

        if [[ ${MERGE_TYPE} == "binary" ]] ; then
                # ignore build failures when installing a binary package
#324685
                do_compile_test "" "$@" 2>/dev/null || return 0
        else
                if ! do_compile_test "" "$@" ; then
                        ewarn "Simple build failed ... assuming this is desired
#324685"
                        return 0
                fi
        fi

        pushd "${T}" >/dev/null

        ./glibc-test
        ret=$?
        rm -f glibc-test*

        popd >/dev/null

        return ${ret}
}

setup_target_flags() {
        # This largely mucks with compiler flags.  None of which should matter
        # when building up just the headers.
        just_headers && return 0

        case $(tc-arch) in
                x86)
                        # -march needed for #185404 #199334
                        # TODO: When creating the first glibc cross-compile,
this test will
                        # always fail as it does a full link which in turn
requires glibc.
                        # Probably also applies when changing multilib profile
settings (e.g.
                        # enabling x86 when the profile was amd64-only
previously).
                        # We could change main to _start and pass -nostdlib
here so that we
                        # only test the gcc code compilation.  Or we could do a
compile and
                        # then look for the symbol via scanelf.
                        if ! do_compile_test "" 'void f(int i, void *p) {if
(__sync_fetch_and_add(&i, 1)) f(i, p);}\nint main(){return 0;}\n' 2>/dev/null ;
then
                                local t=${CTARGET_OPT:-${CTARGET}}
                                t=${t%%-*}
                                filter-flags '-march=*'
                                export CFLAGS="-march=${t} ${CFLAGS}"
                                einfo "Auto adding -march=${t} to CFLAGS
#185404"
                        fi
                ;;
                amd64)
                        # -march needed for #185404 #199334
                        # Note: This test only matters when the x86 ABI is
enabled, so we could
                        # optimize a bit and elide it.
                        # TODO: See cross-compile issues listed above for x86.
                        if ! do_compile_test "${CFLAGS_x86}" 'void f(int i,
void *p) {if (__sync_fetch_and_add(&i, 1)) f(i, p);}\nint main(){return 0;}\n'
2>/dev/null ; then
                                local t=${CTARGET_OPT:-${CTARGET}}
                                t=${t%%-*}
                                # Normally the target is x86_64-xxx, so turn
that into the -march that
                                # gcc actually accepts. #528708
                                [[ ${t} == "x86_64" ]] && t="x86-64"
                                filter-flags '-march=*'
                                # ugly, ugly, ugly.  ugly.
                                CFLAGS_x86=$(CFLAGS=${CFLAGS_x86} filter-flags
'-march=*'; echo "${CFLAGS}")
                                export CFLAGS_x86="${CFLAGS_x86} -march=${t}"
                                einfo "Auto adding -march=${t} to CFLAGS_x86
#185404"
                        fi
                ;;
                mips)
                        # The mips abi cannot support the GNU style hashes.
#233233
                        filter-ldflags -Wl,--hash-style=gnu
-Wl,--hash-style=both
                ;;
                sparc)
                        # Both sparc and sparc64 can use -fcall-used-g6.  -g7
is bad, though.
                        filter-flags "-fcall-used-g7"
                        append-flags "-fcall-used-g6"

                        # If the CHOST is the basic one (e.g. not sparcv9-xxx
already),
                        # try to pick a better one so glibc can use
cpu-specific .S files.
                        # We key off the CFLAGS to get a good value.  Also need
to handle
                        # version skew.
                        # We can't force users to set their CHOST to their
exact machine
                        # as many of these are not recognized by config.sub/gcc
and such :(.
                        # Note: If the mcpu values don't scale, we might try
probing CPP defines.
                        # Note: Should we factor in -Wa,-AvXXX flags too ?  Or
-mvis/etc... ?

                        local cpu
                        case ${CTARGET} in
                        sparc64-*)
                                case $(get-flag mcpu) in
                                niagara[234])
                                        if version_is_at_least 2.8 ; then
                                                cpu="sparc64v2"
                                        elif version_is_at_least 2.4 ; then
                                                cpu="sparc64v"
                                        elif version_is_at_least 2.2.3 ; then
                                                cpu="sparc64b"
                                        fi
                                        ;;
                                niagara)
                                        if version_is_at_least 2.4 ; then
                                                cpu="sparc64v"
                                        elif version_is_at_least 2.2.3 ; then
                                                cpu="sparc64b"
                                        fi
                                        ;;
                                ultrasparc3)
                                        cpu="sparc64b"
                                        ;;
                                *)
                                        # We need to force at least v9a because
the base build doesn't
                                        # work with just v9.
                                        #
https://sourceware.org/bugzilla/show_bug.cgi?id=19477
                                        [[ -z ${cpu} ]] && append-flags
"-Wa,-xarch=v9a"
                                        ;;
                                esac
                                ;;
                        sparc-*)
                                case $(get-flag mcpu) in
                                niagara[234])
                                        if version_is_at_least 2.8 ; then
                                                cpu="sparcv9v2"
                                        elif version_is_at_least 2.4 ; then
                                                cpu="sparcv9v"
                                        elif version_is_at_least 2.2.3 ; then
                                                cpu="sparcv9b"
                                        else
                                                cpu="sparcv9"
                                        fi
                                        ;;
                                niagara)
                                        if version_is_at_least 2.4 ; then
                                                cpu="sparcv9v"
                                        elif version_is_at_least 2.2.3 ; then
                                                cpu="sparcv9b"
                                        else
                                                cpu="sparcv9"
                                        fi
                                        ;;
                                ultrasparc3)
                                        cpu="sparcv9b"
                                        ;;
                                v9|ultrasparc)
                                        cpu="sparcv9"
                                        ;;
                                v8|supersparc|hypersparc|leon|leon3)
                                        cpu="sparcv8"
                                        ;;
                                esac
                        ;;
                        esac
                        [[ -n ${cpu} ]] && CTARGET_OPT="${cpu}-${CTARGET#*-}"
                ;;
        esac
}

setup_flags() {
        # Make sure host make.conf doesn't pollute us
        if is_crosscompile || tc-is-cross-compiler ; then
                CHOST=${CTARGET} strip-unsupported-flags
        fi

        # Store our CFLAGS because it's changed depending on which CTARGET
        # we are building when pulling glibc on a multilib profile
        CFLAGS_BASE=${CFLAGS_BASE-${CFLAGS}}
        CFLAGS=${CFLAGS_BASE}
        CXXFLAGS_BASE=${CXXFLAGS_BASE-${CXXFLAGS}}
        CXXFLAGS=${CXXFLAGS_BASE}
        ASFLAGS_BASE=${ASFLAGS_BASE-${ASFLAGS}}
        ASFLAGS=${ASFLAGS_BASE}

        # Over-zealous CFLAGS can often cause problems.  What may work for one
        # person may not work for another.  To avoid a large influx of bugs
        # relating to failed builds, we strip most CFLAGS out to ensure as few
        # problems as possible.
        strip-flags
        strip-unsupported-flags
        filter-flags -m32 -m64 '-mabi=*'

        # glibc aborts if rpath is set by LDFLAGS
        filter-ldflags '-Wl,-rpath=*'

        # #492892
        filter-flags -frecord-gcc-switches

        unset CBUILD_OPT CTARGET_OPT
        if use multilib ; then
                CTARGET_OPT=$(get_abi_CTARGET)
                [[ -z ${CTARGET_OPT} ]] && CTARGET_OPT=$(get_abi_CHOST)
        fi

        setup_target_flags

        if [[ -n ${CTARGET_OPT} && ${CBUILD} == ${CHOST} ]] && !
is_crosscompile; then
                CBUILD_OPT=${CTARGET_OPT}
        fi

        # Lock glibc at -O2; we want to be conservative here.
        # -fno-strict-aliasing is to work around #155906.
        filter-flags '-O?'
        append-flags -O2 -fno-strict-aliasing

        filter-flags '-fstack-protector*'

        # Starting with gcc-6 (and fully upstreamed pie patches) we control
        # default enabled/disabled pie via use flags. So nothing to do
        # here then. #618160
        if [[ $(gcc-major-version) -lt 6 ]]; then
                if use hardened && tc-enables-pie ; then
                        # Force PIC macro definition for all compilations since
they're all
                        # either -fPIC or -fPIE with the default-PIE compiler.
                        append-cppflags -DPIC
                else
                        # Don't build -fPIE without the default-PIE compiler
and the
                        # hardened-pie patch
                        filter-flags -fPIE
                fi
        fi
}

want_tls() {
        # Archs that can use TLS (Thread Local Storage)
        case $(tc-arch) in
                x86)
                        # requires i486 or better #106556
                        [[ ${CTARGET} == i[4567]86* ]] && return 0
                        return 1
                ;;
        esac
        return 0
}

want__thread() {
        want_tls || return 1

        # For some reason --with-tls --with__thread is causing segfaults on
sparc32.
        [[ ${PROFILE_ARCH} == "sparc" ]] && return 1

        [[ -n ${WANT__THREAD} ]] && return ${WANT__THREAD}

        # only test gcc -- can't test linking yet
        tc-has-tls -c ${CTARGET}
        WANT__THREAD=$?

        return ${WANT__THREAD}
}

use_multiarch() {
        # Allow user to disable runtime arch detection in multilib.
        use multiarch || return 1
        # Make sure binutils is new enough to support indirect functions,
        # #336792. This funky sed supports gold and bfd linkers.
        local bver nver
        bver=$($(tc-getLD ${CTARGET}) -v | sed -n -r
'1{s:[^0-9]*::;s:^([0-9.]*).*:\1:;p}')
        case $(tc-arch ${CTARGET}) in
        amd64|x86) nver="2.20" ;;
        arm)       nver="2.22" ;;
        hppa)      nver="2.23" ;;
        ppc|ppc64) nver="2.20" ;;
        # ifunc support was added in 2.23, but glibc also needs
        # machinemode which is in 2.24.
        s390)      nver="2.24" ;;
        sparc)     nver="2.21" ;;
        *)         return 1 ;;
        esac
        version_is_at_least ${nver} ${bver}
}

# Setup toolchain variables that had historically been defined in the
# profiles for these archs.
setup_env() {
        # silly users
        unset LD_RUN_PATH
        unset LD_ASSUME_KERNEL

        if is_crosscompile || tc-is-cross-compiler ; then
                multilib_env ${CTARGET_OPT:-${CTARGET}}

                if ! use multilib ; then
                        MULTILIB_ABIS=${DEFAULT_ABI}
                else
                        MULTILIB_ABIS=${MULTILIB_ABIS:-${DEFAULT_ABI}}
                fi

                # If the user has CFLAGS_<CTARGET> in their make.conf, use
that,
                # and fall back on CFLAGS.
                local VAR=CFLAGS_${CTARGET//[-.]/_}
                CFLAGS=${!VAR-${CFLAGS}}
                einfo " $(printf '%15s' 'Manual CFLAGS:')   ${CFLAGS}"
        fi

        setup_flags

        export ABI=${ABI:-${DEFAULT_ABI:-default}}

        if use headers-only ; then
                # Avoid mixing host's CC and target's CFLAGS_${ABI}:
                # At this bootstrap stage we have only binutils for
                # target but not compiler yet.
                einfo "Skip CC ABI injection. We can't use (cross-)compiler
yet."
                return 0
        fi
        local VAR=CFLAGS_${ABI}
        # We need to export CFLAGS with abi information in them because glibc's
        # configure script checks CFLAGS for some targets (like mips).  Keep
        # around the original clean value to avoid appending multiple ABIs on
        # top of each other.
        : ${__GLIBC_CC:=$(tc-getCC ${CTARGET_OPT:-${CTARGET}})}
        export __GLIBC_CC CC="${__GLIBC_CC} ${!VAR}"
        einfo " $(printf '%15s' 'Manual CC:')   ${CC}"
}

foreach_abi() {
        setup_env

        local ret=0
        local abilist=""
        if use multilib ; then
                abilist=$(get_install_abis)
        else
                abilist=${DEFAULT_ABI}
        fi
        local -x ABI
        for ABI in ${abilist:-default} ; do
                setup_env
                einfo "Running $1 for ABI ${ABI}"
                $1
                : $(( ret |= $? ))
        done
        return ${ret}
}

glibc_banner() {
        local b="Gentoo ${PVR}"
        [[ -n ${PATCH_VER} ]] && ! use vanilla && b+=" p${PATCH_VER}"
        echo "${b}"
}

check_devpts() {
        # Make sure devpts is mounted correctly for use w/out setuid pt_chown.

        # If merely building the binary package, then there's nothing to
verify.
        [[ ${MERGE_TYPE} == "buildonly" ]] && return

        # Only sanity check when installing the native glibc.
        [[ ${ROOT} != "/" ]] && return

        # If they're opting in to the old suid code, then no need to check.
        use suid && return

        if awk '$3 == "devpts" && $4 ~ /[, ]gid=5[, ]/ { exit 1 }' /proc/mounts
; then
                eerror "In order to use glibc with USE=-suid, you must make
sure that"
                eerror "you have devpts mounted at /dev/pts with the gid=5
option."
                eerror "Openrc should do this for you, so you should check
/etc/fstab"
                eerror "and make sure you do not have any invalid settings
there."
                die "mount & fix your /dev/pts settings"
        fi
}

# The following Kernel version handling functions are mostly copied from
portage
# source. It's better not to use linux-info.eclass here since a) it adds too
# much magic, see bug 326693 for some of the arguments, and b) some of the
# functions are just not provided.

g_get_running_KV() {
        uname -r
        return $?
}

g_KV_major() {
        [[ -z $1 ]] && return 1
        local KV=$@
        echo "${KV%%.*}"
}

g_KV_minor() {
        [[ -z $1 ]] && return 1
        local KV=$@
        KV=${KV#*.}
        echo "${KV%%.*}"
}

g_KV_micro() {
        [[ -z $1 ]] && return 1
        local KV=$@
        KV=${KV#*.*.}
        echo "${KV%%[^[:digit:]]*}"
}

g_KV_to_int() {
        [[ -z $1 ]] && return 1
        local KV_MAJOR=$(g_KV_major "$1")
        local KV_MINOR=$(g_KV_minor "$1")
        local KV_MICRO=$(g_KV_micro "$1")
        local KV_int=$(( KV_MAJOR * 65536 + KV_MINOR * 256 + KV_MICRO ))

        # We make version 2.2.0 the minimum version we will handle as
        # a sanity check ... if its less, we fail ...
        if [[ ${KV_int} -ge 131584 ]] ; then
                echo "${KV_int}"
                return 0
        fi
        return 1
}

g_int_to_KV() {
        local version=$1 major minor micro
        major=$((version / 65536))
        minor=$(((version % 65536) / 256))
        micro=$((version % 256))
        echo ${major}.${minor}.${micro}
}

eend_KV() {
        [[ $(g_KV_to_int $1) -ge $(g_KV_to_int $2) ]]
        eend $?
}

get_kheader_version() {
        printf '#include <linux/version.h>\nLINUX_VERSION_CODE\n' | \
        $(tc-getCPP ${CTARGET}) -I "${EPREFIX}/$(alt_build_headers)" - | \
        tail -n 1
}

# We collect all sanity checks here. Consistency is not guranteed between
# pkg_ and src_ phases, so we call this function both in pkg_pretend and in
# src_unpack.
sanity_prechecks() {
        # Make sure devpts is mounted correctly for use w/out setuid pt_chown
        check_devpts

        # Prevent native builds from downgrading
        if [[ ${MERGE_TYPE} != "buildonly" ]] && \
           [[ ${ROOT} == "/" ]] && \
           [[ ${CBUILD} == ${CHOST} ]] && \
           [[ ${CHOST} == ${CTARGET} ]] ; then

                # The high rev # is to allow people to downgrade between -r#
                # versions. We want to block 2.20->2.19, but 2.20-r3->2.20-r2
                # should be fine. Hopefully we never actually use a r# this
                # high.
                if has_version ">${CATEGORY}/${P}-r10000" ; then
                        eerror "Sanity check to keep you from breaking your
system:"
                        eerror " Downgrading glibc is not supported and a sure
way to destruction."
                        die "Aborting to save your system."
                fi

                if ! do_run_test '#include <unistd.h>\n#include
<sys/syscall.h>\nint main(){return syscall(1000)!=-1;}\n' ; then
                        eerror "Your old kernel is broken. You need to update
it to a newer"
                        eerror "version as syscall(<bignum>) will break. See
bug 279260."
                        die "Old and broken kernel."
                fi
        fi

        # Users have had a chance to phase themselves, time to give em the boot
        if [[ -e ${EROOT}/etc/locale.gen ]] && [[ -e ${EROOT}/etc/locales.build
]] ; then
                eerror "You still haven't deleted ${EROOT}/etc/locales.build."
                eerror "Do so now after making sure ${EROOT}/etc/locale.gen is
kosher."
                die "Lazy upgrader detected"
        fi

        if [[ ${CTARGET} == i386-* ]] ; then
                eerror "i386 CHOSTs are no longer supported."
                eerror "Chances are you don't actually want/need i386."
                eerror "Please read
https://www.gentoo.org/doc/en/change-chost.xml"
                die "Please fix your CHOST"
        fi

        if [[ -e /proc/xen ]] && [[ $(tc-arch) == "x86" ]] && ! is-flag
-mno-tls-direct-seg-refs ; then
                ewarn "You are using Xen but don't have
-mno-tls-direct-seg-refs in your CFLAGS."
                ewarn "This will result in a 50% performance penalty when
running with a 32bit"
                ewarn "hypervisor, which is probably not what you want."
        fi

        use hardened && ! tc-enables-pie && \
                ewarn "PIE hardening not applied, as your compiler doesn't
default to PIE"

        # Check for sanity of /etc/nsswitch.conf
        if [[ -e ${EROOT}/etc/nsswitch.conf ]] ; then
                local entry
                for entry in passwd group shadow; do
                        if ! egrep -q "^[ \t]*${entry}:.*files"
"${EROOT}"/etc/nsswitch.conf; then
                                eerror "Your ${EROOT}/etc/nsswitch.conf is out
of date."
                                eerror "Please make sure you have 'files'
entries for"
                                eerror "'passwd:', 'group:' and 'shadow:'
databases."
                                eerror "For more details see:"
                                eerror " 
https://wiki.gentoo.org/wiki/Project:Toolchain/nsswitch.conf_in_glibc-2.26"
                                die "nsswitch.conf has no 'files' provider in
'${entry}'."
                        fi
                done
        fi

        # ABI-specific checks follow here. Hey, we have a lot more specific
conditions that
        # we test for...
        if ! is_crosscompile ; then
                if use amd64 && use multilib && [[ ${MERGE_TYPE} != "binary" ]]
; then
                        ebegin "Checking that IA32 emulation is enabled in the
running kernel"
                        echo 'int main(){return 0;}' >
"${T}/check-ia32-emulation.c"
                        local STAT
                        if "${CC-${CHOST}-gcc}" ${CFLAGS_x86}
"${T}/check-ia32-emulation.c" -o "${T}/check-ia32-emulation.elf32"; then
                                "${T}/check-ia32-emulation.elf32"
                                STAT=$?
                        else
                                # Don't fail here to allow single->multi ABI
switch
                                # or recover from breakage like bug #646424
                                ewarn "Failed to compile the ABI test. Broken
host glibc?"
                                STAT=0
                        fi
                        rm -f "${T}/check-ia32-emulation.elf32"
                        eend $STAT
                        [[ $STAT -eq 0 ]] || die "CONFIG_IA32_EMULATION must be
enabled in the kernel to compile a multilib glibc."
                fi

        fi

        # When we actually have to compile something...
        if ! just_headers ; then
                ebegin "Checking gcc for __thread support"
                if ! eend $(want__thread ; echo $?) ; then
                        echo
                        eerror "Could not find a gcc that supports the __thread
directive!"
                        eerror "Please update your binutils/gcc and try again."
                        die "No __thread support in gcc!"
                fi

                if [[ ${CTARGET} == *-linux* ]] ; then
                        local run_kv build_kv want_kv

                        run_kv=$(g_get_running_KV)
                        build_kv=$(g_int_to_KV $(get_kheader_version))
                        want_kv=${MIN_KERN_VER}

                        if ! is_crosscompile && ! tc-is-cross-compiler ; then
                                # Building fails on an non-supporting kernel
                                ebegin "Checking running kernel version
(${run_kv} >= ${want_kv})"
                                if ! eend_KV ${run_kv} ${want_kv} ; then
                                        echo
                                        eerror "You need a kernel of at least
${want_kv}!"
                                        die "Kernel version too low!"
                                fi
                        fi

                        ebegin "Checking linux-headers version (${build_kv} >=
${want_kv})"
                        if ! eend_KV ${build_kv} ${want_kv} ; then
                                echo
                                eerror "You need linux-headers of at least
${want_kv}!"
                                die "linux-headers version too low!"
                        fi
                fi
        fi
}

#
# the phases
#

# pkg_pretend

pkg_pretend() {
        # All the checks...
        einfo "Checking general environment sanity."
        sanity_prechecks
}

# src_unpack

src_unpack() {
        # Consistency is not guaranteed between pkg_ and src_ ...
        sanity_prechecks

        use multilib && unpack
gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz

        setup_env

        if [[ -n ${EGIT_REPO_URI} ]] ; then
                git-r3_src_unpack
        else
                unpack ${P}.tar.xz
        fi

        cd "${S}" || die
        touch locale/C-translit.h || die #185476 #218003

        cd "${WORKDIR}" || die
        unpack glibc-${RELEASE_VER}-patches-${PATCH_VER}.tar.bz2
}

src_prepare() {
        if ! use vanilla ; then
                elog "Applying Gentoo Glibc Patchset
${RELEASE_VER}-${PATCH_VER}"
                eapply "${WORKDIR}"/patches
                einfo "Done."
        fi

        default

        gnuconfig_update

        cd "${WORKDIR}"
        find . -name configure -exec touch {} +

        eprefixify extra/locale/locale-gen

        # Fix permissions on some of the scripts.
        chmod u+x "${S}"/scripts/*.sh

        cd "${S}"
}

glibc_do_configure() {
        # Glibc does not work with gold (for various reasons) #269274.
        tc-ld-disable-gold

        # CXX isnt handled by the multilib system, so if we dont unset here
        # we accumulate crap across abis
        unset CXX

        einfo "Configuring glibc for nptl"

        if use doc ; then
                export MAKEINFO=makeinfo
        else
                export MAKEINFO=/dev/null
        fi

        local v
        for v in ABI CBUILD CHOST CTARGET CBUILD_OPT CTARGET_OPT CC CXX LD
{AS,C,CPP,CXX,LD}FLAGS MAKEINFO ; do
                einfo " $(printf '%15s' ${v}:)   ${!v}"
        done

        # CFLAGS can contain ABI-specific flags like -mfpu=neon, see bug
#657760
        # To build .S (assembly) files with the same ABI-specific flags
        # upstream currently recommends adding CFLAGS to CC/CXX:
        #    https://sourceware.org/PR23273
        # Note: Passing CFLAGS via CPPFLAGS overrides glibc's arch-specific
CFLAGS
        # and breaks multiarch support. See 659030#c3 for an example.
        # The glibc configure script doesn't properly use LDFLAGS all the time.
        export CC="$(tc-getCC ${CTARGET}) ${CFLAGS} ${LDFLAGS}"
        einfo " $(printf '%15s' 'Manual CC:')   ${CC}"

        # Some of the tests are written in C++, so we need to force our multlib
abis in, bug 623548
        export CXX="$(tc-getCXX ${CTARGET}) $(get_abi_CFLAGS) ${CFLAGS}"
        einfo " $(printf '%15s' 'Manual CXX:')   ${CXX}"

        echo

        local myconf=()

        case ${CTARGET} in
                powerpc-*)
                        # Currently gcc on powerpc32 generates invalid code for
                        # __builtin_return_address(0) calls. Normally programs
                        # don't do that but malloc hooks in glibc do:
                        # https://gcc.gnu.org/PR81996
                        # https://bugs.gentoo.org/629054
                        myconf+=( --enable-stack-protector=no )
                        ;;
                *)
                        myconf+=( --enable-stack-protector=all )
                        ;;
        esac
        myconf+=( --enable-stackguard-randomization )

        # Keep a whitelist of targets supporing IFUNC. glibc's ./configure
        # is not robust enough to detect proper support:
        #    https://bugs.gentoo.org/641216
        #    https://sourceware.org/PR22634#c0
        case $(tc-arch ${CTARGET}) in
                # Keep whitelist of targets where autodetection mostly works.
                amd64|x86|sparc|ppc|ppc64|arm|arm64|s390) ;;
                # Blacklist everywhere else
                *) myconf+=( libc_cv_ld_gnu_indirect_function=no ) ;;
        esac

        # Enable Intel Control-flow Enforcement Technology on amd64 if
requested
        case ${CTARGET} in
                x86_64-*) myconf+=( $(use_enable cet) ) ;;
                *) ;;
        esac

        [[ $(tc-is-softfloat) == "yes" ]] && myconf+=( --without-fp )

        myconf+=( --enable-kernel=${MIN_KERN_VER} )

        # Since SELinux support is only required for nscd, only enable it if:
        # 1. USE selinux
        # 2. only for the primary ABI on multilib systems
        # 3. Not a crosscompile
        if ! is_crosscompile && use selinux ; then
                if use multilib ; then
                        if is_final_abi ; then
                                myconf+=( --with-selinux )
                        else
                                myconf+=( --without-selinux )
                        fi
                else
                        myconf+=( --with-selinux )
                fi
        else
                myconf+=( --without-selinux )
        fi

        # Force a few tests where we always know the answer but
        # configure is incapable of finding it.
        if is_crosscompile ; then
                export \
                        libc_cv_c_cleanup=yes \
                        libc_cv_forced_unwind=yes
        fi

        myconf+=(
                --without-cvs
                --disable-werror
                --enable-bind-now
                --build=${CBUILD_OPT:-${CBUILD}}
                --host=${CTARGET_OPT:-${CTARGET}}
                $(use_enable profile)
                $(use_with gd)
                --with-headers=$(alt_build_headers)
                --prefix="${EPREFIX}/usr"
                --sysconfdir="${EPREFIX}/etc"
                --localstatedir="${EPREFIX}/var"
                --libdir='$(prefix)'/$(get_libdir)
                --mandir='$(prefix)'/share/man
                --infodir='$(prefix)'/share/info
                --libexecdir='$(libdir)'/misc/glibc
                --with-bugurl=https://bugs.gentoo.org/
                --with-pkgversion="$(glibc_banner)"
                $(use_multiarch || echo --disable-multi-arch)
                $(use_enable systemtap)
                $(use_enable nscd)
                ${EXTRA_ECONF}
        )

        # We rely on sys-libs/timezone-data for timezone tools normally.
        myconf+=( $(use_enable vanilla timezone-tools) )

        # These libs don't have configure flags.
        ac_cv_lib_audit_audit_log_user_avc_message=$(usex audit || echo no)
        ac_cv_lib_cap_cap_init=$(usex caps || echo no)

        # There is no configure option for this and we need to export it
        # since the glibc build will re-run configure on itself
        export libc_cv_rootsbindir="${EPREFIX}/sbin"
        export libc_cv_slibdir="${EPREFIX}/$(get_libdir)"

        # We take care of patching our binutils to use both hash styles,
        # and many people like to force gnu hash style only, so disable
        # this overriding check.  #347761
        export libc_cv_hashstyle=no

        local builddir=$(builddir nptl)
        mkdir -p "${builddir}"
        cd "${builddir}"
        set -- "${S}"/configure "${myconf[@]}"
        echo "$@"
        "$@" || die "failed to configure glibc"

        # ia64 static cross-compilers are a pita in so much that they
        # can't produce static ELFs (as the libgcc.a is broken).  so
        # disable building of the programs for those targets if it
        # doesn't work.
        # XXX: We could turn this into a compiler test, but ia64 is
        # the only one that matters, so this should be fine for now.
        if is_crosscompile && [[ ${CTARGET} == ia64* ]] ; then
                sed -i '1i+link-static = touch $@' config.make
        fi

        # If we're trying to migrate between ABI sets, we need
        # to lie and use a local copy of gcc.  Like if the system
        # is built with MULTILIB_ABIS="amd64 x86" but we want to
        # add x32 to it, gcc/glibc don't yet support x32.
        #
        if [[ -n ${GCC_BOOTSTRAP_VER} ]] && use multilib ; then
                echo 'main(){}' > "${T}"/test.c
                if ! $(tc-getCC ${CTARGET}) ${CFLAGS} ${LDFLAGS} "${T}"/test.c
-Wl,-emain -lgcc 2>/dev/null ; then
                        sed -i -e '/^CC = /s:$:
-B$(objdir)/../'"gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}/${ABI}:"
config.make || die
                fi
        fi
}

glibc_headers_configure() {
        export ABI=default

        local builddir=$(builddir "headers")
        mkdir -p "${builddir}"
        cd "${builddir}"

        # if we don't have a compiler yet, we can't really test it now ...
        # hopefully they don't affect header generation, so let's hope for
        # the best here ...
        local v vars=(
                ac_cv_header_cpuid_h=yes
               
libc_cv_{386,390,alpha,arm,hppa,ia64,mips,{powerpc,sparc}{,32,64},sh,x86_64}_tls=yes

                libc_cv_asm_cfi_directives=yes
                libc_cv_broken_visibility_attribute=no
                libc_cv_c_cleanup=yes
                libc_cv_compiler_powerpc64le_binary128_ok=yes
                libc_cv_forced_unwind=yes
                libc_cv_gcc___thread=yes
                libc_cv_mlong_double_128=yes
                libc_cv_mlong_double_128ibm=yes
                libc_cv_ppc_machine=yes
                libc_cv_ppc_rel16=yes
                libc_cv_predef_fortify_source=no
                libc_cv_target_power8_ok=yes
                libc_cv_visibility_attribute=yes
                libc_cv_z_combreloc=yes
                libc_cv_z_execstack=yes
                libc_cv_z_initfirst=yes
                libc_cv_z_nodelete=yes
                libc_cv_z_nodlopen=yes
                libc_cv_z_relro=yes
                libc_mips_abi=${ABI}
                libc_mips_float=$([[ $(tc-is-softfloat) == "yes" ]] && echo
soft || echo hard)
                # These libs don't have configure flags.
                ac_cv_lib_audit_audit_log_user_avc_message=no
                ac_cv_lib_cap_cap_init=no
        )

        einfo "Forcing cached settings:"
        for v in "${vars[@]}" ; do
                einfo " ${v}"
                export ${v}
        done

        local headers_only_arch_CPPFLAGS=()

        # Blow away some random CC settings that screw things up. #550192
        if [[ -d ${S}/sysdeps/mips ]]; then
                pushd "${S}"/sysdeps/mips >/dev/null
                sed -i -e '/^CC +=/s:=.*:= -D_MIPS_SZPTR=32:' mips32/Makefile
mips64/n32/Makefile || die
                sed -i -e '/^CC +=/s:=.*:= -D_MIPS_SZPTR=64:'
mips64/n64/Makefile || die

                # Force the mips ABI to the default.  This is OK because the
set of
                # installed headers in this phase is the same between the 3
ABIs.
                # If this ever changes, this hack will break, but that's
unlikely
                # as glibc discourages that behavior.
                # https://crbug.com/647033
                sed -i -e 's:abiflag=.*:abiflag=_ABIO32:' preconfigure || die

                popd >/dev/null
        fi

        case ${CTARGET} in
        riscv*)
                # RISC-V interrogates the compiler to determine which target to
                # build.  If building the headers then we don't strictly need a
                # RISC-V compiler, so the built-in definitions that are
provided
                # along with all RISC-V compiler might not exist.  This causes
                # glibc's RISC-V preconfigure script to blow up.  Since we're
just
                # building the headers any value will actually work here, so
just
                # pick the standard one (rv64g/lp64d) to make the build scripts
                # happy for now -- the headers are all the same anyway so it
                # doesn't matter.
                headers_only_arch_CPPFLAGS+=(
                        -D__riscv_xlen=64
                        -D__riscv_flen=64
                        -D__riscv_float_abi_double=1
                        -D__riscv_atomic=1
                ) ;;
        esac

        local myconf=()
        myconf+=(
                --disable-sanity-checks
                --enable-hacker-mode
                --without-cvs
                --disable-werror
                --enable-bind-now
                --build=${CBUILD_OPT:-${CBUILD}}
                --host=${CTARGET_OPT:-${CTARGET}}
                --with-headers=$(alt_build_headers)
                --prefix="${EPREFIX}/usr"
                ${EXTRA_ECONF}
        )

        # Nothing is compiled here which would affect the headers for the
target.
        # So forcing CC/CFLAGS is sane.
        local headers_only_CC=$(tc-getBUILD_CC)
        local headers_only_CFLAGS="-O1 -pipe"
        local headers_only_CPPFLAGS="-U_FORTIFY_SOURCE
${headers_only_arch_CPPFLAGS[*]}"
        local headers_only_LDFLAGS=""
        set -- "${S}"/configure "${myconf[@]}"
        echo \
                "CC=${headers_only_CC}" \
                "CFLAGS=${headers_only_CFLAGS}" \
                "CPPFLAGS=${headers_only_CPPFLAGS}" \
                "LDFLAGS=${headers_only_LDFLAGS}" \
                "$@"
        CC=${headers_only_CC} \
        CFLAGS=${headers_only_CFLAGS} \
        CPPFLAGS=${headers_only_CPPFLAGS} \
        LDFLAGS="" \
        "$@" || die "failed to configure glibc"
}

do_src_configure() {
        if just_headers ; then
                glibc_headers_configure
        else
                glibc_do_configure nptl
        fi
}

src_configure() {
        foreach_abi do_src_configure
}

do_src_compile() {
        emake -C "$(builddir nptl)" || die "make nptl for ${ABI} failed"
}

src_compile() {
        if just_headers ; then
                return
        fi

        foreach_abi do_src_compile
}

glibc_src_test() {
        cd "$(builddir nptl)"
        emake check
}

do_src_test() {
        local ret=0

        glibc_src_test
        : $(( ret |= $? ))

        return ${ret}
}

src_test() {
        if just_headers ; then
                return
        fi

        # Give tests more time to complete.
        export TIMEOUTFACTOR=5

        foreach_abi do_src_test || die "tests failed"
}

run_locale_gen() {
        # if the host locales.gen contains no entries, we'll install everything
        local root="$1"
        local locale_list="${root}/etc/locale.gen"
        if [[ -z $(locale-gen --list --config "${locale_list}") ]] ; then
                ewarn "Generating all locales; edit /etc/locale.gen to save
time/space"
                locale_list="${root}/usr/share/i18n/SUPPORTED"
        fi

        locale-gen --jobs $(makeopts_jobs) --config "${locale_list}" \
                --destdir "${root}"
}

glibc_do_src_install() {
        local builddir=$(builddir nptl)
        cd "${builddir}"

        emake install_root="${D}$(alt_prefix)" install || die

        # This version (2.26) provides some compatibility libraries for the
NIS/NIS+ support
        # which come without headers etc. Only needed for binary packages since
the
        # external net-libs/libnsl has increased soversion. Keep only versioned
libraries.
        find "${D}" -name "libnsl.a" -delete
        find "${D}" -name "libnsl.so" -delete

        # Normally upstream_pv is ${PV}. Live ebuilds are exception, there we
need
        # to infer upstream version:
        # '#define VERSION "2.26.90"' -> '2.26.90'
        local upstream_pv=$(sed -n -r 's/#define VERSION "(.*)"/\1/p'
"${S}"/version.h)

        if [[ -e ${ED}$(alt_usrlibdir)/libm-${upstream_pv}.a ]] ; then
                # Move versioned .a file out of libdir to evade portage QA
checks
                # instead of using gen_usr_ldscript(). We fix ldscript as:
                # "GROUP ( /usr/lib64/libm-<pv>.a ..." -> "GROUP (
/usr/lib64/glibc-<pv>/libm-<pv>.a ..."
                sed -i "s@\(libm-${upstream_pv}.a\)@${P}/\1@"
"${ED}"$(alt_usrlibdir)/libm.a || die
                dodir $(alt_usrlibdir)/${P}
                mv "${ED}"$(alt_usrlibdir)/libm-${upstream_pv}.a
"${ED}"$(alt_usrlibdir)/${P}/libm-${upstream_pv}.a || die
        fi

        # We'll take care of the cache ourselves
        rm -f "${ED}"/etc/ld.so.cache

        # Everything past this point just needs to be done once ...
        is_final_abi || return 0

        # Make sure the non-native interp can be found on multilib systems even
        # if the main library set isn't installed into the right place.  Maybe
        # we should query the active gcc for info instead of hardcoding it ?
        local i ldso_abi ldso_name
        local ldso_abi_list=(
                # x86
                amd64   /lib64/ld-linux-x86-64.so.2
                x32     /libx32/ld-linux-x32.so.2
                x86     /lib/ld-linux.so.2
                # mips
                o32     /lib/ld.so.1
                n32     /lib32/ld.so.1
                n64     /lib64/ld.so.1
                # powerpc
                ppc     /lib/ld.so.1
                ppc64   /lib64/ld64.so.1
                # s390
                s390    /lib/ld.so.1
                s390x   /lib/ld64.so.1
                # sparc
                sparc32 /lib/ld-linux.so.2
                sparc64 /lib64/ld-linux.so.2
        )
        case $(tc-endian) in
        little)
                ldso_abi_list+=(
                        # arm
                        arm64   /lib/ld-linux-aarch64.so.1
                )
                ;;
        big)
                ldso_abi_list+=(
                        # arm
                        arm64   /lib/ld-linux-aarch64_be.so.1
                )
                ;;
        esac
        if [[ ${SYMLINK_LIB} == "yes" ]] && [[ ! -e ${ED}/$(alt_prefix)/lib ]]
; then
                dosym $(get_abi_LIBDIR ${DEFAULT_ABI}) $(alt_prefix)/lib
        fi
        for (( i = 0; i < ${#ldso_abi_list[@]}; i += 2 )) ; do
                ldso_abi=${ldso_abi_list[i]}
                has ${ldso_abi} $(get_install_abis) || continue

                ldso_name="$(alt_prefix)${ldso_abi_list[i+1]}"
                if [[ ! -L ${ED}/${ldso_name} && ! -e ${ED}/${ldso_name} ]] ;
then
                        dosym ../$(get_abi_LIBDIR ${ldso_abi})/${ldso_name##*/}
${ldso_name}
                fi
        done

        # With devpts under Linux mounted properly, we do not need the pt_chown
        # binary to be setuid.  This is because the default owners/perms will
be
        # exactly what we want.
        if ! use suid ; then
                find "${ED}" -name pt_chown -exec chmod -s {} +
        fi

        #################################################################
        # EVERYTHING AFTER THIS POINT IS FOR NATIVE GLIBC INSTALLS ONLY #
        # Make sure we install some symlink hacks so that when we build
        # a 2nd stage cross-compiler, gcc finds the target system
        # headers correctly.  See gcc/doc/gccinstall.info
        if is_crosscompile ; then
                # We need to make sure that /lib and /usr/lib always exists.
                # gcc likes to use relative paths to get to its multilibs like
                # /usr/lib/../lib64/.  So while we don't install any files into
                # /usr/lib/, we do need it to exist.
                keepdir $(alt_prefix)/lib
                keepdir $(alt_prefix)/usr/lib

                dosym usr/include $(alt_prefix)/sys-include
                return 0
        fi

        # Files for Debian-style locale updating
        dodir /usr/share/i18n
        sed \
                -e "/^#/d" \
                -e "/SUPPORTED-LOCALES=/d" \
                -e "s: \\\\::g" -e "s:/: :g" \
                "${S}"/localedata/SUPPORTED > "${ED}"/usr/share/i18n/SUPPORTED
\
                || die "generating /usr/share/i18n/SUPPORTED failed"
        cd "${WORKDIR}"/extra/locale
        dosbin locale-gen
        doman *.[0-8]
        insinto /etc
        doins locale.gen

        # Make sure all the ABI's can find the locales and so we only
        # have to generate one set
        local a
        keepdir /usr/$(get_libdir)/locale
        for a in $(get_install_abis) ; do
                if [[ ! -e ${ED}/usr/$(get_abi_LIBDIR ${a})/locale ]] ; then
                        dosym ../$(get_libdir)/locale /usr/$(get_abi_LIBDIR
${a})/locale