[clang] [Clang][OpenCL][AMDGPU] Allow a kernel to call another kernel (PR #115821)

[Aniket Lal via cfe-commits]

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@@ -5692,7 +5692,10 @@ CGCallee CodeGenFunction::EmitCallee(const Expr *E) {
   // Resolve direct calls.
   } else if (auto DRE = dyn_cast<DeclRefExpr>(E)) {
     if (auto FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
-      return EmitDirectCallee(*this, FD);
+      auto CalleeDecl = FD->hasAttr<OpenCLKernelAttr>()
+                            ? GlobalDecl(FD, KernelReferenceKind::Stub)
+                            : FD;
+      return EmitDirectCallee(*this, CalleeDecl);
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lalaniket8 wrote:

I see, I can get the correct CalleePtr which is of type `llvm::Constant`, but I 
am not able to figure out how to convert the same into a `GlobalDecl` object.

https://github.com/llvm/llvm-project/pull/115821
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