[clang] [SYCL] Error on C inputs when compiling with -fsycl (PR #200318)

[Aaron Ballman via cfe-commits]

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@@ -1,4 +1,4 @@
-// RUN:  %clang_cc1 -fsycl-is-device -triple spir64 -emit-llvm %s -o - | FileCheck %s
+// RUN:  %clang_cc1 -fsycl-is-device -triple spir64 -x c++ -emit-llvm %s -o - | FileCheck %s
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AaronBallman wrote:

Maybe rename the file to have a .cpp extension instead?

https://github.com/llvm/llvm-project/pull/200318