When downgrading cross-x86_64-pc-linux-gnu/glibc from 3.4-r1 to 2.3.6-r4, build fails with the following.
make[4]: Leaving directory `/var/tmp/portage/glibc-2.3.6-r4/work/glibc-2.3.6/posix' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iofclose.o)(.text+0x1d6): In function `fclose': iofclose.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iofclose.o)(.eh_frame+0x12): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iogetdelim.o)(.eh_frame+0x11): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(wfileops.o)(.text+0x4f1): In function `_IO_wfile_underflow': wfileops.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(wfileops.o)(.eh_frame+0x12): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(fileops.o)(.text+0xb41): In function `_IO_new_file_underflow': fileops.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(fileops.o)(.eh_frame+0x12): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(syslog.o)(.text+0x750): In function `vsyslog': syslog.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(syslog.o)(.text+0x8a6): In function `openlog': syslog.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(syslog.o)(.text+0x94f): In function `closelog': syslog.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(syslog.o)(.eh_frame+0x12): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iofflush.o)(.text+0xbf): In function `_IO_fflush': iofflush.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iofflush.o)(.eh_frame+0x12): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iofputs.o)(.text+0x11d): In function `_IO_fputs': iofputs.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iofputs.o)(.eh_frame+0x12): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(ioftell.o)(.eh_frame+0x11): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iofwrite.o)(.text+0x13d): In function `_IO_fwrite': iofwrite.c: undefined reference to `_Unwind_Resume' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(iofwrite.o)(.eh_frame+0x12): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(ioseekoff.o)(.eh_frame+0x11): undefined reference to `__gcc_personality_v0' /var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/libc.a(fseek.o)(.eh_frame+0x11): undefined reference to `__gcc_personality_v0' collect2: ld returned 1 exit status make[2]: *** [/var/tmp/portage/glibc-2.3.6-r4/work/build-amd64-x86_64-pc-linux-gnu-nptl/elf/sln] Error 1
$ emerge --info Portage 2.1.1_pre2-r7 (default-linux/x86/2005.1, gcc-3.4.6, glibc-2.3.6-r4, 2.6.17-gentoo i686) ================================================================= System Settings ================================================================= System uname: 2.6.17-gentoo i686 AMD Athlon(tm) XP 3000+ Gentoo Base System version 1.6.15 distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632) [enabled] ccache version 2.3 [enabled] app-admin/eselect-compiler: [Not Present] dev-lang/python: 2.4.3-r1 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: 2.3 dev-util/confcache: [Not Present] sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2 sys-devel/binutils: 2.16.1-r3 sys-devel/gcc-config: 1.3.13-r3 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="x86" ACCEPT_LICENSE="" ALSA_CARDS="emu10k1" ANT_HOME="/usr/share/ant-core" ARCH="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CCACHE_DIR="/var/tmp/ccache/" CCACHE_SIZE="2G" CFLAGS="-O2 -march=athlon-xp -pipe -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" CLASSPATH="." CLEAN_DELAY="5" COLORTERM="" CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/texmf/xdvi/" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/java-config/vms/ /etc/revdep-rebuild /etc/splash /etc/terminfo" CVS_RSH="ssh" CXXFLAGS="-O2 -march=athlon-xp -pipe -fomit-frame-pointer" DBUS_SESSION_BUS_ADDRESS="unix:abstract=/tmp/dbus-Npx0MxTTBJ,guid=2e19b5444dbbe8223b14035cfedd9900" DCCC_PATH="/usr/lib/distcc/bin" DESKTOP_SESSION="kde-3.5" DISPLAY=":0.0" DISTCC_HOSTS="localhost 192.168.0.2" DISTCC_LOG="" DISTCC_VERBOSE="0" DISTDIR="/usr/portage/distfiles" DM_CONTROL="/var/run/xdmctl" E17_ECVS_SERVER="anoncvs.enlightenment.org:/var/cvs/e" EDITOR="/bin/nano" ELIBC="glibc" EMERGE_DEFAULT_OPTS="--verbose" EMERGE_WARNING_DELAY="10" FEATURES="autoconfig candy ccache digest distcc distlocks fixpackages metadata-transfer parallel-fetch sandbox sfperms strict userfetch userpriv usersandbox" FETCHCOMMAND="/usr/bin/wget -t 5 -T 60 --passive-ftp -P ${DISTDIR} ${URI}" GCC_SPECS="" GDK_USE_XFT="1" GDM_LANG="de_DE.utf8" GENTOO_MIRRORS="http://ftp-stud.fht-esslingen.de/pub/Mirrors/gentoo/ ftp://ftp-stud.fht-esslingen.de/pub/Mirrors/gentoo/" GPG_AGENT_INFO="/tmp/gpg-7I2FAj/S.gpg-agent:11892:1" GS_LIB="/home/tek/.fonts" GTK2_RC_FILES="/home/tek/.gtkrc-2.0" GUILE_LOAD_PATH="/usr/share/guile/1.6" G_BROKEN_FILENAMES="1" G_FILENAME_ENCODING="UTF-8" HOME="/home/tek" HOSTNAME="gluon" INFOPATH="/usr/share/info:/usr/share/binutils-data/i686-pc-linux-gnu/2.16.1/info:/usr/share/gcc-data/i686-pc-linux-gnu/3.4.6/info" INPUT_DEVICES="keyboard mouse" JAVAC="/opt/sun-jdk-1.4.2.10/bin/javac" JAVA_HOME="/opt/sun-jdk-1.4.2.10" JDK_HOME="/opt/sun-jdk-1.4.2.10" KDEDIRS="/usr" KDE_FULL_SESSION="true" KDE_MULTIHEAD="true" KDE_NO_IPV6="1" KERNEL="linux" KONSOLE_DCOP="DCOPRef(konsole-12028,konsole)" KONSOLE_DCOP_SESSION="DCOPRef(konsole-12028,session-1)" LANG="de_DE.UTF-8" LC_ALL="de_DE.UTF-8" LESS="-R -M --shift 5" LESSOPEN="|lesspipe.sh %s" LINGUAS="de" LOGNAME="root" LS_COLORS="no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:su=37;41:sg=30;43:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.qt=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.pdf=00;32:*.ps=00;32:*.txt=00;32:*.patch=00;32:*.diff=00;32:*.log=00;32:*.tex=00;32:*.doc=00;32:*.flac=01;35:*.mp3=01;35:*.mpc=00;36:*.ogg=00;36:*.wav=00;36:*.mid=00;36:*.midi=00;36:*.au=00;36:*.flac=00;36:*.aac=00;36:" MAKEOPTS="-j5" MANPATH="/usr/local/share/man:/usr/share/man:/usr/share/binutils-data/i686-pc-linux-gnu/2.16.1/man:/usr/share/gcc-data/i686-pc-linux-gnu/3.4.6/man::/opt/sun-jdk-1.4.2.10/man:/etc/java-config/system-vm/man/:/usr/qt/3/doc/man:/opt/vmware/workstation/man" OPENGL_PROFILE="nvidia" PAGER="/usr/bin/less" PATH="/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/3.4.6:/usr/x86_64-pc-linux-gnu/gcc-bin/3.4.5:/opt/sun-jdk-1.4.2.10/bin:/opt/sun-jdk-1.4.2.10/jre/bin:/opt/sun-jdk-1.4.2.10/jre/javaws:/usr/kde/3.5/sbin:/usr/kde/3.5/bin:/usr/qt/3/bin" PKGDIR="/usr/portage/packages" PORTAGE_ARCHLIST="ppc s390 amd64 ppc64 x86-fbsd m68k arm sparc sh mips ia64 alpha ppc-macos hppa x86" PORTAGE_BINHOST_CHUNKSIZE="3000" PORTAGE_BIN_PATH="/usr/lib/portage/bin" PORTAGE_CALLER="emerge" PORTAGE_CONFIGROOT="/" PORTAGE_DEBUG="0" PORTAGE_ELOG_CLASSES="info warn error log" PORTAGE_ELOG_MAILFROM="portage" PORTAGE_ELOG_MAILSUBJECT="package ${PACKAGE} merged on ${HOST} with notice" PORTAGE_ELOG_MAILURI="root" PORTAGE_ELOG_SYSTEM="save mail" PORTAGE_GID="250" PORTAGE_INST_GID="0" PORTAGE_INST_UID="0" PORTAGE_NICENESS="15" PORTAGE_PYM_PATH="/usr/lib/portage/pym" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude='/distfiles' --exclude='/local' --exclude='/packages'" PORTAGE_RSYNC_RETRIES="3" PORTAGE_TMPDIR="/var/tmp" PORTAGE_WORKDIR_MODE="0700" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage /usr/portage/local/layman/gentoo-de" PRELINK_PATH="" PRELINK_PATH_MASK="/usr/lib/gstreamer-0.10:/usr/lib/gstreamer-0.8:/lib/modules:/usr/lib/locale:/usr/lib/wine:/usr/lib/valgrind:*.la:*.png:*.py:*.pl:*.pm:*.sh:*.xml:*.xslt:*.a:*.js" PWD="/home/tek" QMAKESPEC="linux-g++" QTDIR="/usr/qt/3" RESUMECOMMAND=" /usr/bin/wget -t 5 --passive-ftp ${URI} -O ${DISTDIR}/${FILE}" ROOT="/" RPMDIR="/usr/portage/rpm" SANE_CONFIG_DIR="/etc/sane.d" SESSION_MANAGER="local/gluon:/tmp/.ICE-unix/11931" SHELL="/bin/bash" SHLVL="4" SUDO_COMMAND="/usr/bin/emerge --info" SUDO_GID="100" SUDO_UID="1000" SUDO_USER="tek" SYNC="rsync://rsync.de.gentoo.org/gentoo-portage" TERM="xterm" USE="x86 X alsa apache2 apm avi berkdb bitmap-fonts bzip2 cli crypt cups dbus dlloader dri dvdr eds emboss encode esd foomaticdb fortran gdbm gif gpm gtk2 hal imlib ipv6 isdnlog jabber java jpeg kde kdeenablefinal kdexdeltas libg++ libwww mad mailwrapper mikmod motif mp3 mpeg ncurses nls nptl nptlonly nsplugin nvidia ogg oggvorbis opengl oss pam pam_console pcre pdflib perl png pppd python qt qt3 qt4 quicktime readline reflection sdl session spell spl ssl subversion tcpd truetype truetype-fonts type1-fonts unicode vorbis xinerama xml2 xmms xorg xv zlib elibc_glibc input_devices_keyboard input_devices_mouse kernel_linux linguas_de userland_GNU video_cards_nvidia" USER="root" USERLAND="GNU" USE_EXPAND="DVB_CARDS ELIBC FCDSL_CARDS FRITZCAPI_CARDS INPUT_DEVICES KERNEL LINGUAS LIRC_DEVICES USERLAND VIDEO_CARDS" USE_EXPAND_HIDDEN="ELIBC KERNEL USERLAND" USE_ORDER="env:pkg:conf:defaults" VIDEO_CARDS="nvidia" WINDOWID="12582920" XARGS="xargs -r" XCURSOR_THEME="gentoo" XDG_CONFIG_DIRS="/usr/kde/3.5/etc/xdg" XDG_DATA_DIRS="/usr/kde/3.5/share:/usr/share" XDM_MANAGED="/var/run/xdmctl/xdmctl-:0,maysd,mayfn,sched,rsvd,method=classic" _="/usr/bin/sudo"
cross-x86_64-pc-linux-gnu/glibc-2.3.6-r4 [2.4-r1] USE="nls nptl nptlonly -build -erandom% -glibc-compat20% -glibc-omitfp -hardened -profile"
Downgrading glibc is not possible.
