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This PR deals with removing CUDA 6.5 support and asserting a minimum CUDA version of 7.0.
It does NOT enable features such as C++11 etc that are associated with using CUDA 7 as minimum version.

Also remove boost inline for older CUDA versions

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@shehzan10 Is there any reason you refrained from enabling C++11 support ?

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I wanted that to be done when C++11 features start getting used. That is, the boost stuff is replaced by STL.

		#if CUDA_VERSION < 7000
		#error "ArrayFire CUDA requires CUDA Toolkit Version 7.0 or newer."
		#endif

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Any reason you want to have this here instead of cmake?

In CMake it is as simple as requesting a minimum version in FIND_PACKAGE(CUDA, 7.0) or something similar.

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Yeah, we could do that.

Merged

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Let me run the PR builds. Somehow forgot about it.

PS. OSX CUDA Might fail on tests - But thats a system issue.

build arrayfire linux ci
build arrayfire osx cuda ci
build arrayfire windows ci

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I think it can be merged now