* doc/autoconf.texi (Using System Type): Revise, showing $host rather
than $target since the latter is not usual, add guidelines on when to
use or not use the system type.
$host_cpu pointed out by Ralf Corsepius.
be driven from @samp{$host}.
@item
Assembler code is inevitably highly CPU-specific and is best selected
-according to the CPU part of @samp{$host}.
+according to @samp{$host_cpu}.
@item
Assembler variations like underscore prefix on globals or ELF versus
COFF type directives are however best determined by probing, perhaps