[Nix-dev] CPU type misdetection

[Ludovic Courtès]

Hello,

Recently, I was told that the `lm' flag (for "long mode") in
/proc/cpuinfo roughly means "x86-64".  My laptop has an Intel Core 2
Duo, which has this flags, and really is "x86-64".  However, to Nix, my
system is `i686-linux' although it could/should be `x86_64-linux'.

Consequently, GNU `config.guess' returns `i686-pc-linux-gnu' because I
only have an i686 tool chain.

I'm not sure where the initial misconfiguration occurred, but it looks
like there's room for improvement here.  Ideas?

Thanks,
Ludo'.