cannot compute suffix of object files: cannot compile: -a64 unsupported

[Jonathan Wakely]

On 25 November 2013 19:13, dellair jie wrote:
> Folks,
>
> I am compiling GCC 4.4.5 on AIX 6.1 with xlc 10.1.
>
> GMP, MPFR, MPC are compiled because we have no root control over the server.

Then you should probably build then in-tree, not install them
separately. See http://gcc.gnu.org/wiki/InstallingGCC

> configure:2627: error: in `/gcc/powerpc-ibm-aix6.1.0.0/ppc64/libgcc':
> configure:2629: error: cannot compute suffix of object files: cannot compile
> See `config.log' for more details.

Have you read http://gcc.gnu.org/wiki/FAQ#configure_suffix ?

If you follow the instructions at
http://gcc.gnu.org/wiki/InstallingGCC it will probably solve your
problem.