multi-line string deprecated

[Tiemo Krüger - mycable GmbH]

Hi,
I'm new to this group so I don't know if this is perhaps an too often 
asked question:

I compile linux-kernels for MIPS. Using actually gcc 3.0.4 and 3.1
With 2.4.10 or 2.4.18 this is no problem.
With a 2.4.0 kernel source modifieed especially for SGI-MIPS and Vr-MIPS
I have a strange problem:

I get a lot warnings similar to this:

In file included from /home/thim/linux/include/linux/fs.h:191,
                  from /home/thim/linux/include/linux/capability.h:17,
                  from /home/thim/linux/include/linux/binfmts.h:5,
                  from /home/thim/linux/include/linux/sched.h:9,
                  from process.c:10:
/home/thim/linux/include/asm/semaphore.h:150:30: warning: multi-line 
string literals are deprecated

And when starting the linking process it fails with:

mipsel-linux-ld: Warning: size of symbol `init_task_union' changed from 
66771909 to 8192 in arch/mips/kernel/init_task.o
mipsel-linux-ld: Warning: size of symbol `linux_banner' changed from 
297121445 to 4 in init/version.o
mipsel-linux-ld: Warning: size of symbol `mips_cputype' changed from 
149569904 to 4 in arch/mips/kernel/kernel.o
make: *** [vmlinux] Speicherzugriffsfehler /* << means something like 
memory access failure */
make: *** Deleting file `vmlinux'

I've read something about the multi-line strings and the use with gcc 
but it makes no sense for me because warnings refer on things which are
identical in old and new kernel sources.
Is there any compiler switch (I used both times the same flags) I have 
to set or unset?

Tiemo :-(