Note:

This error occured while building a x86_64 target with generic optimisation on
x86_64 build host.
The error didn't showed up while building the same target but for x86 with
optimization for pentium2.

snippet from the error log output without that patch:

/usr/lib/gcc/x86_64-unknown-linux-gnu/4.4.4/../../../../x86_64-unknown-linux-gnu/bin/as: symbol lookup error:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.4.4/../../../../x86_64-unknown-linux-gnu/bin/as: undefined symbol: zca
lloc