x86 64 bit resources

[Jean-Claude Gervais]

Hello,

I need help:

I tried the following command: 
windres --target=elf64-ia64-little -i resource.rc -o resource.o

But windres complains about not being able to detect the architecture.
What is the proper architecture type?

I want to build a native resource object for (uname output):

Linux 3.2.12-gentoo #6 SMP x86_64 Intel(R) Core(TM)2 Quad CPU Q6600 @
2.40GHz GenuineIntel GNU/Linux

What is the proper command line so windres will output an object
native to this platform?