[PATCH] Enable building LTO on WIN32

[Greg_Bedwell at sn.scee.net]

Hi,

I've attached a patch which enables building the LTO library (.lib and 
.dll) and llvm-lto.exe on Windows with MSVC and Mingw as well as 
re-enabling the associated test.  I've left the Cygwin behaviour disabled, 
purely because I was unable to build LLVM in the first place using cygwin 
and CMake despite spending many hours trying.  I don't see why there's any 
reason why, in theory, this change won't also work for Cygwin but as I'm 
unable to test it I've been conservative and left the behaviour disabled 
in that case.  I've verified that the dll is exporting the correct symbols 
specified in the .def file in both the MSVC and MinGW cases.


 

I'd be grateful for any feedback.  If it looks okay, please commit for me 
as I don't yet have commit access.

Thanks,

--Greg Bedwell
SN Systems - Sony Computer Entertainment Group
http://www.snsys.com


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