[clang] [llvm] [HLSL] Add -HV option translation to clang-dxc.exe (PR #83938)

[Joshua Batista via cfe-commits]

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@@ -8545,6 +8545,11 @@ def dxc_entrypoint : Option<["--", "/", "-"], "E", KIND_JOINED_OR_SEPARATE>,
                      Group<dxc_Group>,
                      Visibility<[DXCOption]>,
                      HelpText<"Entry point name">;
+def dxc_hlsl_version : Option<["/", "-"], "HV", KIND_JOINED_OR_SEPARATE>,
+                     Group<dxc_Group>,
+                     Visibility<[DXCOption]>,
+                     HelpText<"HLSL Version">,
+                     Values<"2016, 2017, 2018, 2021, 202x">;
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bob80905 wrote:

No, I added that logic myself.  I've manually checked all the valid values and emit an error if there are no matches in  HLSL.cpp:263.
Regardless, I wouldn't need that logic, because I need to perform a unique transformation exhaustively in every valid case, and if there are no matching valid cases, then I emit an error with `else`.

https://github.com/llvm/llvm-project/pull/83938