[clang] [Clang][Lex] Implement CWG3013: Error if #embed parameters were defined as macros (PR #224769)

[Mariya Podchishchaeva via cfe-commits]

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@@ -492,6 +492,14 @@ def warn_compat_pp_embed_directive : Warning<
   InGroup<CPre23Compat>, DefaultIgnore;
 def err_pp_embed_dup_params : Error<
   "cannot specify parameter '%0' twice in the same '#embed' directive">;
+def err_pp_embed_parameter_is_macro : Error<
+  "cannot use %0 as %select{an '#embed'|a '__has_embed'}1 parameter if also"
+  " defined as a macro">;
+def warn_c_pp_embed_parameter_is_macro : Warning<
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Fznamznon wrote:

Should that be something like ExtWarn?

https://github.com/llvm/llvm-project/pull/224769