Clang on CUDA file produces many warnings

Clang Frontend
1

Hello,

I’m having a simple CUDA kernel. I’m using clang only to get the syntax tree without the need to compile or link. I only need the syntax tree to create C# wrappers.

// CsGenerator settings
// namespace = ipipe.CUDA.Tests

//Remark: only enums used in global function declearations are extracted.

enum TestEnum1 {
	TEST_ENUM_ITEM_1_1 = 1,
	TEST_ENUM_ITEM_1_2 = 2
};

enum TestEnum2 {
	TEST_ENUM_ITEM_2_1,
	TEST_ENUM_ITEM_2_2
};

extern "C" __global__ void TestCaseEnum(TestEnum1 enum1, int* mem) {
	int x = blockDim.x * blockIdx.x + threadIdx.x;
	int y = blockDim.y * blockIdx.y + threadIdx.y;
	if (x != 0 || y != 0) {
		return;
	}

	mem[0] = (int)enum1;
}

extern "C" __global__ void TestCaseEnumWithValue(TestEnum2 enum2, int* mem) {
	int x = blockDim.x * blockIdx.x + threadIdx.x;
	int y = blockDim.y * blockIdx.y + threadIdx.y;
	if (x != 0 || y != 0) {
		return;
	}

	mem[0] = (int)enum2;
}

and I’m calling clang with these parameters:

            List<string> parameters = new()
            {
                "-ferror-limit=500",                   // Limit error log to maximal 500 errors.
                "-nocudalib",                          // Do not use the cudalib.
                "-nogpulib",
                "-fsyntax-only",
                "--cuda-device-only",
                "--cuda-gpu-arch=sm_50",               // Set gpu architectur to sm_35, the default sm_20 isn't supported by cuda sdk 9.1
               $"--cuda-path={cudaToolkitPath}",
                "-std=c++17",
                "-v",                                  // Enable verbose mode
            };

The problem is that there are many errors from the core clang libraries itself and I just wanted to ask if this is intended:

CXDiagnostic_Warning :  (0,0): CUDA version is newer than the latest supported version 11.5
CXDiagnostic_Warning Lexical or Preprocessor Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_math.h (39,25): extra tokens at end of #ifdef directive
CXDiagnostic_Warning Lexical or Preprocessor Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_runtime_wrapper.h (254,9): '__host__' macro redefined
CXDiagnostic_Warning Lexical or Preprocessor Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_runtime_wrapper.h (489,9): pragma pop_macro could not pop '__USE_FAST_MATH__', no matching push_macro
CXDiagnostic_Warning Semantic Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_device_functions.h (440,16): function '__isinfl' has internal linkage but is not defined
CXDiagnostic_Warning Semantic Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_device_functions.h (445,16): function '__isnanl' has internal linkage but is not defined
CXDiagnostic_Warning Semantic Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_device_functions.h (229,16): function '__finitel' has internal linkage but is not defined
CXDiagnostic_Warning Semantic Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_math_forward_declares.h (131,18): function 'logb' has internal linkage but is not defined
CXDiagnostic_Warning Semantic Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_math_forward_declares.h (162,18): function 'scalbn' has internal linkage but is not defined
CXDiagnostic_Warning Semantic Issue: E:\TFS\IPIPE\_Build\Debug\Assemblies\ipipe.Cuda.Design.Viewer\LLVM\__clang_cuda_math_forward_declares.h (50,18): function 'copysign' has internal linkage but is not defined

Additionally, I’m using surfaces but also here I get warnings that identifiers, like surf1Dread are undefined.

I’m a bit not understanding the linkage error since I explicitly said that I want the syntax only.
Is this intended or do I miss something? Or is there some documentation I can read on?

Thanks