[all-commits] [llvm/llvm-project] fc53b1: [CUDA][HIP] Fix init var diag in temmplate (#69081)

[Yaxun (Sam) Liu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fc53b1abf7d5e54012ea77a9bc8f6ccb7b487f13
      https://github.com/llvm/llvm-project/commit/fc53b1abf7d5e54012ea77a9bc8f6ccb7b487f13
  Author: Yaxun (Sam) Liu <yaxun.liu at amd.com>
  Date:   2023-10-17 (Tue, 17 Oct 2023)

  Changed paths:
    M clang/lib/Sema/SemaCUDA.cpp
    M clang/test/SemaCUDA/Inputs/cuda-initializers.h
    M clang/test/SemaCUDA/device-var-init.cu

  Log Message:
  -----------
  [CUDA][HIP] Fix init var diag in temmplate (#69081)

Currently clang diagnoses the following code:
(https://godbolt.org/z/s8zK3E5P5) but nvcc
does not.

`
struct A {
   constexpr A(){}
};

struct  B {
  A a;
  int b;
};

template<typename T>
__global__ void kernel( )
{
   __shared__ B x;
}
`

Clang generates an implicit trivial ctor for struct B, which should be
allowed for initializing a shared variable.

However, the body of the ctor is defined only if the template kernel is
instantiated. Clang checks the initialization of variable in
non-instantiated templates, where it cannot find the body of the ctor,
therefore diagnoses it.

This patch skips the check for non-instantiated templates.