[SYCL] Ignore vec_type_hint attribute in SYCL 2020

clang/include/clang/Basic/Attr.td

@@ -4031,6 +4031,7 @@ def VecTypeHint : InheritableAttr {
   let Spellings = [GNU<"vec_type_hint">, CXX11<"sycl", "vec_type_hint">];
   let Args = [TypeArgument<"TypeHint">];
   let Subjects = SubjectList<[Function], ErrorDiag>;
+  let SupportsNonconformingLambdaSyntax = 1;
   let Documentation = [Undocumented];
 }
 

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -11979,6 +11979,9 @@ def warn_ivdep_attribute_argument : Warning<
 def warn_attribute_spelling_deprecated : Warning<
   "attribute %0 is deprecated">,
   InGroup<DeprecatedAttributes>;
+def warn_attribute_deprecated_ignored : Warning<
+  "attribute %0 is deprecated; attribute ignored">,
+  InGroup<DeprecatedAttributes>;
 def note_spelling_suggestion : Note<
   "did you mean to use %0 instead?">;
 def warn_attribute_requires_non_negative_integer_argument :

clang/lib/Sema/SemaDeclAttr.cpp

@@ -4550,8 +4550,11 @@ static void handleSYCLIntelLoopFuseAttr(Sema &S, Decl *D, const ParsedAttr &A) {
 
 static void handleVecTypeHint(Sema &S, Decl *D, const ParsedAttr &AL) {
   // This attribute is deprecated without replacement in SYCL 2020 mode.
-  if (S.LangOpts.getSYCLVersion() > LangOptions::SYCL_2017)
-    S.Diag(AL.getLoc(), diag::warn_attribute_spelling_deprecated) << AL;
+  // Ignore the attribute in SYCL 2020.
+  if (S.LangOpts.getSYCLVersion() > LangOptions::SYCL_2017) {
+    S.Diag(AL.getLoc(), diag::warn_attribute_deprecated_ignored) << AL;
+    return;
+  }
 
   // If the attribute is used with the [[sycl::vec_type_hint]] spelling in SYCL
   // 2017 mode, we want to warn about using the newer name in the older

clang/test/SemaSYCL/vec-type-hint-2.cpp

@@ -0,0 +1,26 @@
+// RUN: %clang_cc1 -fsycl-is-device -sycl-std=2020 -internal-isystem %S/Inputs -fsyntax-only -verify %s
+
+// Test which verifies [[sycl::vec_type_hint()]] is accepted
+// with non-conforming lambda syntax.
+
+// NOTE: This attribute is not supported in the SYCL backends.
+// To be minimally conformant with SYCL2020, attribute is
+// accepted by the Clang FE with a warning. No additional
+// semantic handling or IR generation is done for this
+// attribute.
+
+#include "sycl.hpp"
+
+struct test {};
+
+using namespace sycl;
+queue q;
+
+void bar() {
+  q.submit([&](handler &h) {
+    h.single_task<class kernelname>(
+        // expected-warning@+1 {{attribute 'vec_type_hint' is deprecated; attribute ignored}}
+        []() [[sycl::vec_type_hint(test)]] {});
+  });
+}
+

clang/test/SemaSYCL/vec-type-hint.cpp

@@ -7,4 +7,4 @@
 
 // __attribute__((vec_type_hint)) is deprecated without replacement in SYCL
 // 2020 mode, but is allowed in SYCL 2017 and OpenCL modes.
-KERNEL __attribute__((vec_type_hint(int))) void foo() {} // sycl-2020-warning {{attribute 'vec_type_hint' is deprecated}}
+KERNEL __attribute__((vec_type_hint(int))) void foo() {} // sycl-2020-warning {{attribute 'vec_type_hint' is deprecated; attribute ignored}}