[clang] [llvm] [PowerPC][AIX] Support #pragma comment copyright for AIX (PR #178184)

[Hubert Tong via cfe-commits]

================
@@ -3289,27 +3294,49 @@ void PragmaCommentHandler::HandlePragma(Preprocessor &PP,
     return;
   }
 
-  // Verify that this is one of the 5 explicitly listed options.
+  // Verify that this is one of the 6 explicitly listed options.
   IdentifierInfo *II = Tok.getIdentifierInfo();
   PragmaMSCommentKind Kind =
-    llvm::StringSwitch<PragmaMSCommentKind>(II->getName())
-    .Case("linker",   PCK_Linker)
-    .Case("lib",      PCK_Lib)
-    .Case("compiler", PCK_Compiler)
-    .Case("exestr",   PCK_ExeStr)
-    .Case("user",     PCK_User)
-    .Default(PCK_Unknown);
+      llvm::StringSwitch<PragmaMSCommentKind>(II->getName())
+          .Case("linker", PCK_Linker)
+          .Case("lib", PCK_Lib)
+          .Case("compiler", PCK_Compiler)
+          .Case("exestr", PCK_ExeStr)
+          .Case("user", PCK_User)
+          .Case("copyright", PCK_Copyright)
+          .Default(PCK_Unknown);
+
   if (Kind == PCK_Unknown) {
     PP.Diag(Tok.getLocation(), diag::err_pragma_comment_unknown_kind);
     return;
   }
 
+  // Handle AIX Target restrictions (i.e., warn on all non-copyright kinds).
----------------
hubert-reinterpretcast wrote:

The comment inside the `if` is sufficient. We should avoid creating the impression that these "restrictions" are all permanent.
```suggestion
```

https://github.com/llvm/llvm-project/pull/178184