Build problems on x86_64

[Quentin Spencer <qspencer ieee org>]

I'm having more problems building packages on x86_64. In this case the 
package cln had already build successfully on PPC, but about 2/3 of the 
way through the build on x86_64 I get the following error:

g++ -O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -m64 
-mtune=nocona -I../include -I../include -I./integer -I./base/digitseq 
-I./base/digit -Ibase -I./base -c ./integer/conv/cl_I_mul10plus.cc  
-fPIC -DPIC -o .libs/cl_I_mul10plus.o
{standard input}: Assembler messages:
{standard input}:154: Error: suffix or operands invalid for `mul'

I've never seen an error like this before. Is there any possible 
explanation other than a bug in gcc?

-Quentin