How does one go about compiling a build for armv4t target?

I tried the following:

1. Copying the libecc/config/arm-linux-engeabi to armv4t-linux-engeabi and changed the march to armv4t and prefixes in directories specified there

2. edited src/compiler-rt/sources.mk and copied the armv6 source section to a similar section for armv4t

3. Ran the compiler but it keeps trying to bring in fetch_sync … asm which wont compile under armv4