View source for X32 abi

==Vision==
Incorporate toolchain components and other bits (binutils, gcc, glibc, gdb, kernel, linux-libc-headers) into a meta-x32 layer; And added needed infrastructure into the oe-core/yocto tree so that meta-x32 layer can work on top; so that one can build complete images with x32 abi binaries.

Moving the vision forward to 1.3, we have now integrated the meta-x32 changes into OE-Core, such that a build of 
x32 does not require the meta-x32 layer. If you are using older source base, you will still need meta-x32.  Moving 
forward there is a list of items that need to be fixed for world build (see below)

==Status==
1.2 Status:
* The meta-x32 layer is hosting the x32 tollchain recipes now
* core-image-sato can build and run under qemu
* Many recipes have been fixed for compilation with x32 toolchain.

1.3 Status:
* x32 toolchain and kernel bits are part of OE-Core now
* core-image-sato can build and run under qemux86-64
* Most recipes have been fixed.

==X32 poky setup==

For Edison & Denzil (1.2 and earlier), you need the meta-x32 layer, this is NOT needed for 1.3 and later
*add meta-x32 layer 
** git clone x32 layer
 git clone git://git.yoctoproject.org/experimental/meta-x32
** cat conf/bblayers.conf 
 # LAYER_CONF_VERSION is increased each time build/conf/bblayers.conf
 # changes incompatibly
 LCONF_VERSION = "4"
 
 BBFILES ?= ""
 BBLAYERS = " \
   /home/nitin/prj/poky.git/meta \
   /home/nitin/prj/poky.git/meta-yocto \
   /home/nitin/prj/meta-x32.git \
   "

* And add these lines to local.conf - for all releases
 MACHINE = "qemux86-64"
 DEFAULTTUNE = "x86-64-x32"
 #MACHINE = "atom-pc"
 #DEFAULTTUNE = "core2-64-x32"
 baselib = "${@d.getVar('BASE_LIB_tune-' + (d.getVar('DEFAULTTUNE', True) or 'INVALID'), True) or 'lib'}"

==Tasks==
* try and find some way of assessing performance