[clang] [llvm] [CUDA] Add a pseudo GPU sm_next which allows overriding for SM/PTX version. (PR #100247)

[Joseph Huber via cfe-commits]

================
@@ -648,6 +658,13 @@ void NVPTX::getNVPTXTargetFeatures(const Driver &D, const 
llvm::Triple &Triple,
     Features.push_back(Args.MakeArgString(PtxFeature));
     return;
   }
+  // Add --cuda-next-ptx to the list of features, but carry on to add the
+  // default PTX feature for the detected CUDA SDK. NVPTX back-end will use the
+  // higher version.
+  StringRef NextPtx = Args.getLastArgValue(options::OPT_cuda_next_ptx_EQ);
+  if (!NextPtx.empty())
+    Features.push_back(Args.MakeArgString("+ptx" + NextPtx));
----------------
jhuber6 wrote:

We already have `--ptx-feature` to set this manually, could we also use that?

https://github.com/llvm/llvm-project/pull/100247
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