newlib 1.10.0 does not support armv4b ?

[wyb]

I downloaded binutil, gcc, newlib 1.10 and tried to build a cross env for ixp1200.
binutil and gcc builed success, but newlib failed. I got error message from
newlib/configure.host "Newlib does not support CPU armv4b". I modified 
configure.host as follow:

original:
arm)
    machine_dir=arm
    ;;

modified to:
arm)
    machine_dir=arm
    ;;
armv4b)
    machine_dir=arm
    ;;
now build success. 

I want to know does newlib really not support armv4b or its just script error ?
thanks.