libgcc_s.so missing copysignl

[Mathew Yeates <myeates@xxxxxxxxxxxx>]

Hi
I am trying to compile 4.1.2 on SGI Irix. All goes well until 
libgcc_s.so has things added to it which have calls to copysignl. e.g. 
_divtc3.o.

After this xgcc fails with
gccbuild/./gcc/xgcc: rld: Error: unresolvable symbol in 
/u/erda0/myeates/gccbuild/./gcc/libgcc_s.so.1: copysignl

Does anybody know of a fix for this? I have copysignl in  
/usr/lib64/mips4/libm.a. Is this supposed be linked in with libgcc_s.so.1??

Mathew