In the crossgcc list was a problem with gcc-3.4 generating the opcode 'mfcr' with '-mcpu=power' for the second created multilib, when the GCC target is 'rs6000-ibm-aix4.3'. The other multilibs produced as default are for '-pthread', '-mcpu=powerpc' and '-maix64'... The AIX users could judge if all these are normally required, but when the builder also used the '--without-threads', the first sounds being vain or even clashing with something. Building no multilibs using '--disable-multilib' of course is possible...
But what is the case with the 'mfcr' and POWER ? Bug in GNU as (the Linux binutils-2.15.94.0.2.2 was tried) or in GCC (both gcc-3.3.5 and gcc-3.4.3 were tried) ?