[clang] [SystemZ][z/OS] Add visibility features for z/OS (eg. _Export, pragma export) (PR #111035)

[Sean Perry via cfe-commits]

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@@ -1906,6 +1906,36 @@ class Sema final : public SemaBase {
   ActOnPragmaMSFunction(SourceLocation Loc,
                         const llvm::SmallVectorImpl<StringRef> &NoBuiltins);
 
+  /// A label from a C++ #pragma export, for a symbol that we
+  /// haven't seen the declaration for yet. The TypeList is the argument list
+  /// the function must match if HasTypeList is true.
+  struct SymbolLabel {
+    std::optional<SmallVector<QualType, 4>> TypeList;
+    StringRef MappedName;
+    SourceLocation NameLoc;
+    bool HasTypeList;
+    Qualifiers CVQual;
+  };
+
+  typedef SmallVector<SymbolLabel, 1> PendingSymbolOverloads;
+  typedef llvm::DenseMap<NestedNameSpecifier *, PendingSymbolOverloads>
+      SymbolNames;
+  SymbolNames PendingExportNames;
+
+  FunctionDecl *tryFunctionLookUp(NestedNameSpecifier *NestedName,
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perry-ca wrote:

This is used by another pragma I'm going to upstream next.  This isn't used by pragma export but it is used by other pragmas we'll upstream after this one.  I missed this when removing all of that code and can remove it for now if you wish.

https://github.com/llvm/llvm-project/pull/111035