Certain kname types fail to compile for parallel_for<kname>

[cmpfeil]

Describe the bug

Certain choices for the optional template parameter typename KernelName for parallel_for cause compilation error.

To reproduce

Minimal modification of the basic example from SYCL Basic Code: parallel_for is sufficient: Replace parallel_for by parallel_for<kname> with specific type for kname. Full code:

// example.cxx
#include <CL/sycl.hpp>
#include <cstdint>

template <std::uint8_t N>
struct Something {};

using kname = Something<34>; // problem
//using kname = Something<11>; // no problem for other values

using namespace sycl;

int main() {
  queue Q;
  int const size = 10;
  buffer<int> A{ size };

  Q.submit([&](handler& h) {
      accessor A_acc(A, h);
      h.parallel_for<kname>(range<1>(size), [=](id<1> indx) {
          A_acc[indx] = 77;
          });
      });

  host_accessor result(A);

  for (int i = 0; i < size; i++)
    std::cout << result[i] << " "; std::cout << "\n";
  return 0;
}

Compilation via icpx -fsycl example.cxx reproduces the error

In file included from <built-in>:1:
/tmp/icpx-9fdd42b796/example-header-ab166a.h:65:63: warning: missing terminating ' character [-Winvalid-pp-token]
   65 |     return "::sycl::detail::__pf_kernel_wrapper<::Something<'"'>>";
      |                                                               ^
/tmp/icpx-9fdd42b796/example-header-ab166a.h:65:63: error: expected ';' after return statement
   65 |     return "::sycl::detail::__pf_kernel_wrapper<::Something<'"'>>";
      |                                                               ^
      |                                                               ;
/tmp/icpx-9fdd42b796/example-header-ab166a.h:112:27: warning: missing terminating ' character [-Winvalid-pp-token]
  112 |     return "::Something<'"'>";
      |                           ^
/tmp/icpx-9fdd42b796/example-header-ab166a.h:112:27: error: expected ';' after return statement
  112 |     return "::Something<'"'>";
      |                           ^
      |                           ;

See also https://www.godbolt.org/z/scWTq48a6

Environment

• OS: Linux (at least)
• DPC++ versions 2022.2.0 and newer reproduce this error
• DPC++ versions 2022.1.0 and older don't reproduce this error

Additional context

Suspected cause: According to cppref

... std::uint8_t may be unsigned char, ...

Then, I guess the value of 34 corresponding to the character " causes the compiler generated header /tmp/icpx-9fdd42b796/example-header-ab166a.h to contain these syntax errors: e.g., return "::Something<'"'>"; which should rather be return "::Something<'\"'>";.

[bader]

@tahonermann, FYI.