[OpenACC] Implement 'declare' construct AST/Sema

The 'declare' construct is the first of two 'declaration' level
constructs, so it is legal in any place a declaration is, including as a
statement, which this accomplishes by wrapping it in a DeclStmt. All
clauses on this have a 'same scope' requirement, which this enforces as
declaration context instead, which makes it possible to implement these
as a template.

The 'link' and 'device_resident' clauses are also added, which have some
similar/small restrictions, but are otherwise pretty rote.

This patch implements all of the above.

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 4a269f6..5726d79 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -1569,6 +1569,9 @@ public:
   void EmitOMPDeclareMapper(const OMPDeclareMapperDecl *D,
                             CodeGenFunction *CGF = nullptr);
 
+  // Emit code for the OpenACC Declare declaration.
+  void EmitOpenACCDeclare(const OpenACCDeclareDecl *D, CodeGenFunction *CGF);
+
   /// Emit a code for requires directive.
   /// \param D Requires declaration
   void EmitOMPRequiresDecl(const OMPRequiresDecl *D);