This is not against current trunk; it applies to gomp-4_0-branch where 
it is one of the necessary parts to make offloading x86->nvptx work. The 
issue is that the LTO file format depends on the machine_modes enum, it 
needs to match between host and offload target. The easiest way to do 
this is to just use the host-modes.def when compiling an offload compiler.

Ports that want to be hosts for offloading may need to modify their 
modes.def. The patch below contains changes to i386-modes.def which 
modifies XFmode depending on a target switch. I'm not actually entirely 
sure what to do about this. Do we want to make this flag an error when 
offloading is enabled? Or maybe add float format support to the 
-foffload-abi option?

Thoughts? Ok for the first part of the patch once the other offloading 
patches have gone in (bootstrapped and tested on x86_64-linux)?


Bernd