[clang] clang: Forward exception_model flag for bitcode inputs (PR #146342)

[Matt Arsenault via cfe-commits]

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@@ -4002,6 +4022,24 @@ bool CompilerInvocation::ParseLangArgs(LangOptions &Opts, ArgList &Args,
     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
                         Diags, Opts.Sanitize);
 
+    if (const Arg *A = Args.getLastArg(options::OPT_exception_model)) {
+      std::optional<LangOptions::ExceptionHandlingKind> EMValue =
+          llvm::StringSwitch<std::optional<LangOptions::ExceptionHandlingKind>>(
+              A->getValue())
+              .Case("dwarf", LangOptions::ExceptionHandlingKind::DwarfCFI)
+              .Case("sjlj", LangOptions::ExceptionHandlingKind::SjLj)
+              .Case("wineh", LangOptions::ExceptionHandlingKind::WinEH)
+              .Case("wasm", LangOptions::ExceptionHandlingKind::Wasm)
+              .Case("none", LangOptions::ExceptionHandlingKind::None)
+              .Default(std::nullopt);
+      if (EMValue) {
+        Opts.ExceptionHandling = static_cast<unsigned>(*EMValue);
+      } else {
+        Diags.Report(diag::err_drv_invalid_value)
+            << A->getAsString(Args) << A->getValue();
+      }
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arsenm wrote:

Multiple lines implies braces, and then keep on all if one does 

https://github.com/llvm/llvm-project/pull/146342