Xen devel - Mar 2011 - [PATCH 0 of 2] [RFC] Allow link-time optimization of Xen

This patch series applies on top of the clang/llvm one I just posted. 
It rearranges the Xen makefiles so that Xen can be built using 
bitcode intermediate files and link-time optimization.  Since 
gold can''t link binary and bitcode files together to produce a 
bitcode file, we need to gather binary objects and bitcode objects
separately until the final link. 

The first patch does that and is a candidate for checking in, although
maybe not immediately. The second is just a hack to work around a bug
in the LLVM linker,  and is just here for anyone who wants to try it out. 


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This involves gathering object files from .asm (which will be binary)
and object files from .c (which will be in LTO format) separately
until the final link.

Only tested for x86_64 Xen builds using Clang/LLVM bitcode; it should be
possible to do the same with newer GCCs and GIMPLE.

Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>




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http://llvm.org/bugs/show_bug.cgi?id=8759
Work around that by renaming a lot of files (using symlinks).

This patch is definitely not to be considered for checking in to
xen-unstable; it''s just a hack to work around LLVM until it''s
fixed.




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