[clang] [clang] [modules] Add err_main_in_named_module (PR #146247)

[Chuanqi Xu via cfe-commits]

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@@ -1062,6 +1062,8 @@ def err_constexpr_main : Error<
   "'main' is not allowed to be declared %select{constexpr|consteval}0">;
 def err_deleted_main : Error<"'main' is not allowed to be deleted">;
 def err_mainlike_template_decl : Error<"%0 cannot be a template">;
+def warn_main_in_named_module
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ChuanqiXu9 wrote:

Let's add a warning option for it.

https://github.com/llvm/llvm-project/pull/146247
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