On Friday, September 04, 2015 4:28:43 PM Fernando Rodriguez wrote:
> On Friday, September 04, 2015 4:23:57 PM Ajai Khattri wrote:
> > 
> > I know that Go 1.5 is limited to 64bit CPUs but im running on a 64bit CPU 
> > and Im trying to update Go from 1.0 to the latest stable (which is 1.4.2 
> > anyway):
> > 
> > dev ~ #  emerge -uDatv dev-lang/go
> > 
> >   * IMPORTANT: 8 news items need reading for repository 'gentoo'.
> >   * Use eselect news read to view new items.
> > 
> > 
> > These are the packages that would be merged, in reverse order:
> > 
> > Calculating dependencies... done!
> > [ebuild     U  ] dev-lang/go-1.4.2::gentoo [1.0.1::gentoo] 
> > USE="(-bash-completion%*) (-emacs%) (-pax_kernel%) (-vim-syntax%*) 
> > (-zsh-completion%)" 0 KiB
> > 
> > Total: 1 package (1 upgrade), Size of downloads: 0 KiB
> > 
> > Would you like to merge these packages? [Yes/No]
> > 
> > >>> Verifying ebuild manifests
> > 
> > >>> Emerging (1 of 1) dev-lang/go-1.4.2::gentoo
> >   * go1.4.2.src.tar.gz SHA256 SHA512 WHIRLPOOL size ;-) ...               
[ 
> > ok ]
> > >>> Unpacking source...
> > >>> Unpacking go1.4.2.src.tar.gz to 
> > /var/tmp/portage/dev-lang/go-1.4.2/work
> > >>> Source unpacked in /var/tmp/portage/dev-lang/go-1.4.2/work
> > >>> Preparing source in /var/tmp/portage/dev-lang/go-1.4.2/work/go ...
> > >>> Source prepared.
> > >>> Configuring source in /var/tmp/portage/dev-lang/go-1.4.2/work/go ...
> > >>> Source configured.
> > >>> Compiling source in /var/tmp/portage/dev-lang/go-1.4.2/work/go ...
> > # Building C bootstrap tool.
> > cmd/dist
> > 
> > # Building compilers and Go bootstrap tool for host, linux/amd64.
> > lib9
> > /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9/atoi.c:1:0: error: CPU 
> > you selected does not support x86-64 instruction set
> > /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9/_p9dir.c:1:0: error: 
> > CPU you selected does not support x86-64 instruction 
> > set/var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9/await.c:1:0: error: 
> > CPU you selected does not support x86-64 instruction set
> > 
> > go tool dist: FAILED: i686-pc-linux-gnu-gcc -O2 -mtune=i686 -pipe -Wall 
> > -Wstrict-prototypes -Wextra -Wunused -Wno-sign-compare -Wno-missing-braces 
> > -Wno-parentheses -Wno-unknown-pragmas -Wno-switch -Wno-comment 
> > -Wno-missing-field-initializers -fno-common -ggdb -pipe -fmessage-length=0 
> > -c -m64 -I /var/tmp/portage/dev-lang/go-1.4.2/work/go/include -DPLAN9PORT 
> > -I /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9 -o $WORK/atoi.o 
> > /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9/atoi.c
> > /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9/_exits.c:1:0: error: 
> > CPU you selected does not support x86-64 instruction set
> > go tool dist: FAILED: i686-pc-linux-gnu-gcc -O2 -mtune=i686 -pipe -Wall 
> > -Wstrict-prototypes -Wextra -Wunused -Wno-sign-compare -Wno-missing-braces 
> > -Wno-parentheses -Wno-unknown-pragmas -Wno-switch -Wno-comment 
> > -Wno-missing-field-initializers -fno-common -ggdb -pipe -fmessage-length=0 
> > -c -m64 -I /var/tmp/portage/dev-lang/go-1.4.2/work/go/include -DPLAN9PORT 
> > -I /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9 -o $WORK/_exits.o 
> > /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9/_exits.c
> > go tool dist: FAILED: i686-pc-linux-gnu-gcc -O2 -mtune=i686 -pipe -Wall 
> > -Wstrict-prototypes -Wextra -Wunused -Wno-sign-compare -Wno-missing-braces 
> > -Wno-parentheses -Wno-unknown-pragmas -Wno-switch -Wno-comment 
> > -Wno-missing-field-initializers -fno-common -ggdb -pipe -fmessage-length=0 
> > -c -m64 -I /var/tmp/portage/dev-lang/go-1.4.2/work/go/include -DPLAN9PORT 
> > -I /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9 -o $WORK/await.o 
> > /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9/await.c
> > go tool dist: FAILED: i686-pc-linux-gnu-gcc -O2 -mtune=i686 -pipe -Wall 
> > -Wstrict-prototypes -Wextra -Wunused -Wno-sign-compare -Wno-missing-braces 
> > -Wno-parentheses -Wno-unknown-pragmas -Wno-switch -Wno-comment 
> > -Wno-missing-field-initializers -fno-common -ggdb -pipe -fmessage-length=0 
> > -c -m64 -I /var/tmp/portage/dev-lang/go-1.4.2/work/go/include -DPLAN9PORT 
> > -I /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9 -o $WORK/_p9dir.o 
> > /var/tmp/portage/dev-lang/go-1.4.2/work/go/src/lib9/_p9dir.c
> >   * ERROR: dev-lang/go-1.4.2::gentoo failed (compile phase):
> >   *   build failed
> >   *
> >   * Call stack:
> >   *     ebuild.sh, line  93:  Called src_compile
> >   *   environment, line 1886:  Called die
> >   * The specific snippet of code:
> >   *       ./make.bash || die "build failed"
> >   *
> >   * If you need support, post the output of `emerge --info 
> > '=dev-lang/go-1.4.2::gentoo'`,
> >   * the complete build log and the output of `emerge -pqv 
> > '=dev-lang/go-1.4.2::gentoo'`.
> >   * The complete build log is located at 
> > '/var/tmp/portage/dev-lang/go-1.4.2/temp/build.log'.
> >   * The ebuild environment file is located at 
> > '/var/tmp/portage/dev-lang/go-1.4.2/temp/environment'.
> >   * Working directory: '/var/tmp/portage/dev-lang/go-1.4.2/work/go/src'
> >   * S: '/var/tmp/portage/dev-lang/go-1.4.2/work/go'
> > 
> > >>> Failed to emerge dev-lang/go-1.4.2, Log file:
> > 
> > >>>  '/var/tmp/portage/dev-lang/go-1.4.2/temp/build.log'
> > 
> >   * Messages for package dev-lang/go-1.4.2:
> > 
> >   * ERROR: dev-lang/go-1.4.2::gentoo failed (compile phase):
> >   *   build failed
> >   *
> >   * Call stack:
> >   *     ebuild.sh, line  93:  Called src_compile
> >   *   environment, line 1886:  Called die
> >   * The specific snippet of code:
> >   *       ./make.bash || die "build failed"
> >   *
> >   * If you need support, post the output of `emerge --info 
> > '=dev-lang/go-1.4.2::gentoo'`,
> >   * the complete build log and the output of `emerge -pqv 
> > '=dev-lang/go-1.4.2::gentoo'`.
> >   * The complete build log is located at 
> > '/var/tmp/portage/dev-lang/go-1.4.2/temp/build.log'.
> >   * The ebuild environment file is located at 
> > '/var/tmp/portage/dev-lang/go-1.4.2/temp/environment'.
> >   * Working directory: '/var/tmp/portage/dev-lang/go-1.4.2/work/go/src'
> >   * S: '/var/tmp/portage/dev-lang/go-1.4.2/work/go'
> > dev ~ #
> > 
> > 
> > 
> > Not sure how the ebuild is picking CPU, but Im on a 64bit CPU anyway:
> > 
> > dev ~ # lscpu
> > Architecture:          x86_64
> > CPU op-mode(s):        32-bit, 64-bit
> > Byte Order:            Little Endian
> > CPU(s):                2
> > On-line CPU(s) list:   0,1
> > Thread(s) per core:    1
> > Core(s) per socket:    1
> > Socket(s):             2
> > NUMA node(s):          1
> > Vendor ID:             GenuineIntel
> > CPU family:            6
> > Model:                 63
> > Model name:            Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz
> > Stepping:              2
> > CPU MHz:               2499.996
> > BogoMIPS:              5001.32
> > Hypervisor vendor:     KVM
> > Virtualization type:   full
> > L1d cache:             32K
> > L1i cache:             32K
> > L2 cache:              256K
> > L3 cache:              30720K
> > NUMA node0 CPU(s):     0,1
> > dev ~ #
> 
> Post your emerge --info.
> Why do you have  i686-pc-linux-gnu-gcc on a 64-bit machine?

Looks like you installed from the wrong tarball...
There's this[1] you can use to change your CHOST but I don't think it'll work 
to go from 32 to 64 bits.
You may need to (at your own risk) build a 64-bit kernel (on another machine 
or with a cross compiler), reboot to it, unpack a 64 tarball except config 
files, update CHOST on make.conf, and rebuild everything. And you will likely 
run into problems along the way.

[1] https://wiki.gentoo.org/wiki/Changing_the_CHOST_variable
-- 
Fernando Rodriguez

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