[CUDA] Extract CUDA version from cuda.h if version.txt is not found

[tra]

Summary

This is a follow-up to D89752,

If CUDA version can not be determined based on version.txt file, attempt to find CUDA_VERSION macro in cuda.h.

[tra]

Added more tests.

[emankov]

clang/lib/Driver/ToolChains/Cuda.cpp

76–77

Please, add CudaVersion::CUDA_111 declaration in Cuda.h and a corresponding if here.
Btw, switch is possible here.

[jlebar]

LGTM modulo emankov's comment.

[tra]

clang/lib/Driver/ToolChains/Cuda.cpp

76–77

It does not serve any purpose here. 102/110 were added when clang was only accepting specific versions. Now that it will accept any newer version, Arguably it's 102/101 that should be gone until we implement the new functionality. All of that would out of scope for this patch.

As for the switch, it would only work to match exact versions encoded in the CUDA headers, including updates, patches, special private builds etc. I do not have access to all of those versions, so I can not enumerate all of them. Range checking is more robust.

[emankov]

clang/lib/Driver/ToolChains/Cuda.cpp

76–77

Ok, I can "live" with the latest 110 for a while till the appearing of the new functionality in clang. Thanks!

[emankov]

I confirm that D89752 eliminates 47332 on Windows. Tested against the following CUDA versions: 7.0, 7,5, 9,2, 10.0, 10,1, 10.2, 11.0 Update 1, 11.1.

[tra]

In D89832#2349915, @emankov wrote:

I confirm that D89752 eliminates 47332 on Windows. Tested against the following CUDA versions: 7.0, 7,5, 9,2, 10.0, 10,1, 10.2, 11.0 Update 1, 11.1.

Thank you! I appreciate your help testing this patch. I'll land the patches shortly.

[emankov]

D89832 eliminates 47332 on Windows as well. Tested against the same CUDA versions as for D89752.

[tra]

Landed in rGe7fe125b776b