Error: unknown pseudo-op: `.cfi_startproc'

Dears,
 I am using ELDK (2005-06-07) and linux-2.6.15-rc2-2005-12-03-2208.tar.bz2
to build the kernel. But there are some errors:

.../arch/powerpc/kernel/vdso32/gettimeofday.S: Assembler messages:
.../arch/powerpc/kernel/vdso32/gettimeofday.S:28: Error: unknown pseudo-op: `.cfi_startproc'
.../arch/powerpc/kernel/vdso32/gettimeofday.S:30: Error: unknown pseudo-op: `.cfi_register'
.......

Anybody knows what happened ? And is there any way to solve ?

Thank you for your help.
/HappyPhot