Re: ld segfaults building kernel

[Paul Brook <paul at codesourcery dot com>]

On Tuesday 19 September 2006 21:45, MatthewLCreech@eaton.com wrote:
> Hi, I'm having trouble getting the Linux kernel to link properly when
> compiled with -fasynchronous-unwind-tables for ARM (EABI).  The
> ARM-Linux folks aren't familiar with this error, and suggested that I
> post here.
>...
>> >   LD      .tmp_vmlinux1 
> > init/built-in.o:(.ARM.exidx.init.text+0x0): undefined reference to
> > `__aeabi_unwind_cpp_pr1' init/built-in.o:(.ARM.exidx.init.text+0x68):
> > undefined reference to `__aeabi_unwind_cpp_pr1'

If you want to use unwinding you need the corresponding runtime libray.
For normal application this is provided by libgcc.  However the kernel 
provides its own runtime library.

The unwinding interface is part of the EABI:
http://www.arm.com/products/DevTools/ABI.html

Note that ARM uses a different unwinding table format to other targets, as 
documented in the EABI.

Paul