[SYCL] Add compile-only sycl::span tests (#5056)

span declaration tests only require compilation, should be routinely checked by check-sycl, instead of llvm-test-suite.

Signed-off-by: Chris Perkins <[email protected]>

Author: cperkinsintel

sycl/test/basic_tests/span.cpp

@@ -0,0 +1,37 @@
+// RUN: %clangxx -fsycl -c %s
+
+//==--------------- span.cpp - SYCL span test ------------------------------==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <CL/sycl.hpp>
+
+int main() {
+  // test the various span declarations, especially unspecialized ones.
+  // should compile
+  int arr[]{1, 2, 3, 4};
+  const int constArr[]{8, 7, 6};
+  std::vector<int> vec(4);
+
+  // unspecialized
+  sycl::span fromArray{arr};
+  sycl::span fromConstArray{constArr};
+  sycl::span fromVec{vec};
+
+  // partly specialized
+  sycl::span<int> fromIntArray{arr};
+  sycl::span<const int> fromIntConstArray{constArr};
+  sycl::span<int> fromIntVec{vec};
+
+  // fully specialized
+  // TODO: fix fully specialized span from array declaration support
+  // sycl::span<int,4> fullSpecArray{arr};
+  // sycl::span<const int,3> fullSpecConstArray{constArr};
+  sycl::span<int, 4> fullSpecVecArray{vec};
+
+  return 0;
+}