Re: [gentoo-user] Can't update to go-1.4.2

[Fernando Rodriguez]

On Wednesday, September 09, 2015 3:37:36 PM Ajai Khattri wrote:
> On Fri, 4 Sep 2015, Fernando Rodriguez wrote:
>
> > Post your emerge --info.
> > Why do you have  i686-pc-linux-gnu-gcc on a 64-bit machine?
>
> FYI, this is 32bit Gentoo running on a 64bit virtual machine (so it has a
> 64bit kernel) because awhile ago I upgraded from a 32bit setup. Was hoping
> I wouldn't have to reinstall the whole OS...
>
> Output from emerge --info:
>
> Portage 2.2.20.1 (python 2.7.9-final-0, default/linux/x86/13.0, gcc-4.6.3,
> glibc-2.20-r2, 4.1.5-x86_64-linode61 x86_64)
> =================================================================
> System uname:
> Linux-4.1.5-x86_64-linode61-x86_64-Intel-R-_Xeon-R-
_CPU_E5-2680_v3_@_2.50GHz-with-gentoo-2.2
> KiB Mem:     2047052 total,     24452 free
> KiB Swap:     524284 total,    523404 free
> Timestamp of repository gentoo: Mon, 17 Aug 2015 20:30:01 +0000
> sh bash 4.3_p33-r2
> ld GNU ld (Gentoo 2.24 p1.4) 2.24
> app-shells/bash:          4.3_p33-r2::gentoo
> dev-lang/perl:            5.20.2::gentoo
> dev-lang/python:          2.4.6::gentoo, 2.5.4-r4::gentoo, 2.6.9::gentoo,
> 2.7.9-r1::gentoo, 3.1.4-r3::gentoo, 3.2.5-r6::gentoo, 3.3.5-r1::gentoo,
> 3.4.1::gentoo
> dev-util/cmake:           3.2.2::gentoo
> dev-util/pkgconfig:       0.28-r2::gentoo
> sys-apps/baselayout:      2.2::gentoo
> sys-apps/openrc:          0.12.4::gentoo
> sys-apps/sandbox:         2.6-r1::gentoo
> sys-devel/autoconf:       2.13::<unknown repository>, 2.69::gentoo
> sys-devel/automake:       1.4_p6::<unknown repository>, 1.5::<unknown
> repository>, 1.6.3::<unknown repository>, 1.7.9-r1::<unknown repository>,
> 1.8.5-r3::<unknown repository>, 1.9.6-r2::<unknown repository>,
> 1.10.3::gentoo, 1.11.6::gentoo, 1.12.6::gentoo, 1.13.4::gentoo,
> 1.14.1::gentoo, 1.15::gentoo
> sys-devel/binutils:       2.24-r3::gentoo
> sys-devel/gcc:            4.1.2::<unknown repository>, 4.3.4::gentoo,
> 4.4.5::gentoo, 4.5.4::gentoo, 4.6.3::gentoo, 4.7.3-r1::gentoo,
> 4.8.4::gentoo
> sys-devel/gcc-config:     1.7.3::gentoo
> sys-devel/libtool:        2.4.6::gentoo
> sys-devel/make:           4.1-r1::gentoo
> sys-kernel/linux-headers: 3.18::gentoo (virtual/os-headers)
> sys-libs/glibc:           2.20-r2::gentoo
> Repositories:
>
> gentoo
>      location: /usr/portage
>      sync-type: rsync
>      sync-uri: rsync://rsync.gentoo.org/gentoo-portage
>      priority: -1000
>
> x-portage
>      location: /usr/local/portage
>      masters: gentoo
>      priority: 0
>
> ACCEPT_KEYWORDS="x86"
> ACCEPT_LICENSE="* -@EULA"
> CBUILD="i686-pc-linux-gnu"
> CFLAGS="-O2 -mtune=i686 -pipe"
> CHOST="i686-pc-linux-gnu"
> CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
> CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d
> /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release
> /etc/php/apache2-php5.3/ext-active/ /etc/php/apache2-php5.4/ext-active/
> /etc/php/apache2-php5.5/ext-active/ /etc/php/apache2-php5.6/ext-active/
> /etc/php/cgi-php5.3/ext-active/ /etc/php/cgi-php5.4/ext-active/
> /etc/php/cgi-php5.5/ext-active/ /etc/php/cgi-php5.6/ext-active/
> /etc/php/cli-php5.3/ext-active/ /etc/php/cli-php5.4/ext-active/
> /etc/php/cli-php5.5/ext-active/ /etc/php/cli-php5.6/ext-active/
> /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
> CXXFLAGS="-O2 -mtune=i686 -pipe"
> DISTDIR="/usr/portage/distfiles"
> FCFLAGS="-O2 -march=i686 -pipe"
> FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks
> ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs
> protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs
> unmerge-orphans userfetch userpriv usersandbox usersync"
> FFLAGS="-O2 -march=i686 -pipe"
> GENTOO_MIRRORS="http://mirror.usu.edu/mirrors/gentoo/
> http://gentoo.llarian.net/ http://mirrors.rit.edu/gentoo/
> http://gentoo.netnitco.net"
> LDFLAGS="-Wl,-O1 -Wl,--as-needed"
> MAKEOPTS="-j3"
> PKGDIR="/usr/portage/packages"
> PORTAGE_CONFIGROOT="/"
> PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times
> --omit-dir-times --compress --force --whole-file --delete --stats
> --human-readable --timeout=180 --exclude=/distfiles --exclude=/local
> --exclude=/packages"
> PORTAGE_TMPDIR="/var/tmp"
> USE="apache2 bash-completion berkdb bzip2 cli cracklib crypt cxx dri gdbm
> iconv ipv6 ithreads modules ncurses nls nptl nptlonly openmp pam pcre
> readline seccomp session ssl tcpd threads unicode x86 zlib" ABI_X86="32"
> ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci
> emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0
> intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci"
> APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd
> authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile
> authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock dbd
> deflate dir disk_cache env expires ext_filter file_cache filter headers
> ident imagemap include info log_config logio mem_cache mime mime_magic
> negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http
> rewrite setenvif so speling status unique_id userdir usertrack
> vhost_alias" APACHE2_MPMS="worker" CALLIGRA_FEATURES="kexi words flow plan
> sheets stage tables krita karbon braindump author" CAMERAS="ptp2"
> COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog"
> CPU_FLAGS_X86="aes avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2
> ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18
> garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver
> oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate
> tnt ublox ubx" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux"
> LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb
> ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console
> presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice"
> PHP_TARGETS="php5-6" PYTHON_SINGLE_TARGET="python2_7"
> PYTHON_TARGETS="python2_7 python3_4" RUBY_TARGETS="ruby21" USERLAND="GNU"
> VIDEO_CARDS="fbdev glint intel mach64 mga nouveau nv r128 radeon savage
> sis tdfx trident vesa via vmware dummy v4l" XTABLES_ADDONS="quota2 psd
> pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition
> tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
> Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG,
> LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS,
> PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
>
>
>
>   --
> A
>

You may be able to enable the 64bit ABI just for go. I recently did the same 
to enable x32 abi on amd64 for experimenting (which BTW, according to CERN's 
evaluation can save up to 30% memory and 30% cpu usage over amd64 for some 
applications). This is how I did it:

1. From an amd64 stage3 grab the following files and copy them to your system 
(of the libraries you may only need libc.so.6 but I copied them all to be 
safe):

/lib64/libc.so*
/lib64/libm.so*
/lib64/libpthread.so*
/lib64/libdl.so*
/usr/include/gnu/stubs-64.h

2. Add the following to /etc/portage/make.conf:

MULTILIB_ABIS="amd64 x86"

3. Add the following to /etc/portage/profile/use.mask:

-abi_x86_64

4. Rebuild binutils, gcc and glibc (make sure this rebuilds the gcc version 
for the profile that you're using):

# emerge -v sys-devel/binutils sys-devel/gcc sys-libs/glibc

5. Add the following to /etc/portage/env/dev-lang/go and emerge go (if it 
fails to build uncomment the LDFLAGS like, it causes configure failures with 
some packages):

CFLAGS="-m64"
CXXFLAGS="-m64"
#LDFLAGS="-m elf64_x86_64"

This worked for me because the x86_64 gcc can compile x32 code. I believe i686 
can do the same for amd64, it only needs to be rebuilt to get the helper 
libraries (libgcc and friends). Of course, if any other go ebuilds have 
dependencies on other libraries you will have to add the abi_x86_64 use flag 
manually to those libraries (autounmask and the dep solver won't figure it out) 
but you only need to do this for leaf packages that you want to build with an 
alternate ABI. I think you can run "ABI=amd64 emerge ..." to have portage 
solve it but haven't tried it. If you decide to try this let me know if it 
worked.

-- 
Fernando Rodriguez