[OPENMP] Codegen for `omp declare target` construct.

Added initial codegen for device side of declarations inside `omp
declare target` construct + codegen for implicit `declare target`
functions, which are used in the target regions.

llvm-svn: 327636

1 files changed, 7 insertions, 2 deletions

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 5039be3231b..49ac8c1423f 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -9402,8 +9402,7 @@ bool ASTContext::DeclMustBeEmitted(const Decl *D) {
       return false;
   } else if (isa<PragmaCommentDecl>(D))
     return true;
-  else if (isa<OMPThreadPrivateDecl>(D) ||
-           D->hasAttr<OMPDeclareTargetDeclAttr>())
+  else if (isa<OMPThreadPrivateDecl>(D))
     return true;
   else if (isa<PragmaDetectMismatchDecl>(D))
     return true;
@@ -9492,6 +9491,12 @@ bool ASTContext::DeclMustBeEmitted(const Decl *D) {
         if (DeclMustBeEmitted(BindingVD))
           return true;
 
+  // If the decl is marked as `declare target`, it should be emitted.
+  for (const auto *Decl = D->getMostRecentDecl(); Decl;
+       Decl = Decl->getPreviousDecl())
+    if (Decl->hasAttr<OMPDeclareTargetDeclAttr>())
+      return true;
+
   return false;
 }