CLFS Embedded: The ABI setting

Hi,

In the CLFS Embedded book, in cross-tools/common/abi.xml there is a table with 
supported ABI values, but don't looks very clear, at least to me, when each 
value must be used.

For example,  -mabi=32 and -mabi=64 are for mips, mipsel or both?

For what MIPS processor type is -mabi=n32?

The table also says that -m64 is for all other 64-bits processors, but in 
cross-tools/x86/variables.xml there is no target-triplet for x86_64, is 
x86_64 also supported by this book or that ABI value is only informative and 
can't be used for now?


-- 
Manuel Canales Esparcia
Usuario de LFS nº2886:       http://www.linuxfromscratch.org
LFS en castellano: http://www.escomposlinux.org/lfs-es http://www.lfs-es.info
TLDP-ES:                           http://es.tldp.org