[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, 2 insertions, 0 deletions

diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index ab9d486..9d8eb07 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -21,6 +21,7 @@
 #include "clang/AST/DeclContextInternals.h"
 #include "clang/AST/DeclFriend.h"
 #include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclOpenACC.h"
 #include "clang/AST/DeclOpenMP.h"
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/DependentDiagnostic.h"
@@ -992,6 +993,7 @@ unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
     case LifetimeExtendedTemporary:
     case RequiresExprBody:
     case ImplicitConceptSpecialization:
+    case OpenACCDeclare:
       // Never looked up by name.
       return 0;
   }