[PATCH] Fix for LLVM debug build failure on Windows + MSVC2010SP1

[Manish Verma]

Hi Tim,

> I think I'd just enable it globally rather than only on debug builds,
> but if there's a good reason for the restriction are you aware that
> CMake has other profiles? Debug, MinSizeRel, Release and
> RelWithDebInfo by the looks of it.

I don't know much about /bigobj option and there isn't sufficient
information on the web about the negative impact of this option.
MSDN suggests that debug builds to be affected by this error.

http://msdn.microsoft.com/en-us/library/8578y171(v=vs.80).aspx

Therefore, it seemed that the safest change would be add this option
to only debug build which is the one failing at the moment. I was
hoping the community to know more about this option than I do.

> Also, I'm not sure if it's actually cleaner (I'll leave the decision
> to you) but it's possible to directly set the variables
> CMAKE_C_FLAGS_DEBUG (and so on) instead of using the conditionals.
> ccmake's advanced view will show all of those oddities.

Thanks! I'll check if it makes the patch any cleaner.

Manish

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