Update CUDA Context Creation for CUDA 13

[theonewolf]

This commit checks at compile time if we are using CUDA 13 headers and will link to CUDA 13, at which point we need to use a different function signature for cuCreateCtx as it changed in CUDA 13 (it added a parameter).

For CUDA versions below 13, we continue using the old function signature (a 3 parameter version).

This compiles and runs on my CUDA 13 system. I have not directly tested this with CUDA 12 and below yet.

[anomixer]

Sorry! My typo.
Using your repo and "make COMPUTE=100" works. Thanks!

[karthikeyan1729]

Since the new argument is a pointer, will just passing NULL work?

checkError(cuCtxCreate(&d_ctx, NULL, 0, d_dev));

The CUDA toolkit doc does not clarify this.

[karthikeyan1729]

#if CUDA_VERSION >= 13000

But the Makefile does not define CUDA_VERSION as an integer. It has

CUDA_VERSION ?= 11.8.0

[karthikeyan1729]

Please ignore my comment about CUDA_VERSION. It comes from cuda.h and not from Makefile.