<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/57881>57881</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [C++4OpenCL] Cannot use struct as kernel parameter when accessing through templated struct
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          biggysmith
      </td>
    </tr>
</table>

<pre>
    Hi,

I'm having some issues when using certain types as kernel parameters.  Whenever I try to use a struct defined in template type I get compile errors:

```cpp
struct test_param0{
public:
    struct constants_t{
        int size;
    };
};

template<typename T>
struct test_param1{
public:
    struct constants_t{
        int size;
    };
};

// this compiles fine
kernel void test_kernel0(               
    __read_only image3d_t src_volume, 
    __write_only image3d_t dst_img,  
    __constant test_param0::constants_t& c
)              
{        
} 

// this does not compile
// error: '__constant test_param1<int>::constants_t &__private' cannot be used as the type of a kernel parameter'
kernel void test_kernel1(               
    __read_only image3d_t src_volume, 
    __write_only image3d_t dst_img,  
    __constant test_param1<int>::constants_t& c
)              
{        
} 
```
Is this some sort of OpenCL C++ limitation?  It *feels* like it should be ok.

--
cmd: clang -target spirv64 -emit-llvm -cl-std=clc++2021 -O0  -c -o output.bc input.clcpp 
using llvm 15
</pre>
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