[clang] [CGData] Clang Options (PR #90304)

[Jan Svoboda via cfe-commits]

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@@ -2753,6 +2753,31 @@ void tools::addMachineOutlinerArgs(const Driver &D,
       addArg(Twine("-enable-machine-outliner=never"));
     }
   }
+
+  auto *CodeGenDataGenArg =
+      Args.getLastArg(options::OPT_fcodegen_data_generate_EQ);
+  auto *CodeGenDataUseArg = Args.getLastArg(options::OPT_fcodegen_data_use_EQ);
+
+  // We only allow one of them to be specified.
+  if (CodeGenDataGenArg && CodeGenDataUseArg)
+    D.Diag(diag::err_drv_argument_not_allowed_with)
+        << CodeGenDataGenArg->getAsString(Args)
+        << CodeGenDataUseArg->getAsString(Args);
+
+  // For codegen data gen, the output file is passed to the linker
+  // while a boolean flag is passed to the LLVM backend.
+  if (CodeGenDataGenArg)
+    addArg(Twine("-codegen-data-generate"));
+
+  // For codegen data use, the input file is passed to the LLVM backend.
+  if (CodeGenDataUseArg) {
+    SmallString<128> Path(CodeGenDataUseArg->getNumValues() == 0
+                              ? ""
+                              : CodeGenDataUseArg->getValue());
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jansvoboda11 wrote:

Would replacing this logic with `AliasArgs<["default.cgdata"]>` in `Options.td` on the alias arg work? That way it would be more declarative and consistent with other flags.

https://github.com/llvm/llvm-project/pull/90304