| Issue |
61629
|
| Summary |
CUDA/Clang-16/C++2b: std::isfinite is incorrectly resolved as isfinite from __clang_cuda_cmath.h
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
andrewcorrigan
|
I have a minimal reproducer below which fails with:
- `clang-16`, `-std=c++2b`
But, compiles with:
- `clang-16`, `-std=c++20`
- `clang-15`, `-std=c++20`
- `clang-15`, `-std=c++2b`
Minimal reproducer:
```cpp
#include <cuda.h>
#include <cuda_runtime_api.h>
#include <numeric>
int main(int argc, char** argv)
{
auto test = [&](auto x)
{
return std::isfinite(x);
};
test(-1.0f);
return 0;
}
```
This compiles in C++20 mode with Clang-16, as well as both C++20 and C++2b mode with Clang-15:
```
% /install/llvm-16.0.0/bin/clang++ -std=c++2b -x cuda test.cpp
% /install/llvm-15.0.0/bin/clang++ -std=c++2b -x cuda test.cpp
% /install/llvm-15.0.0/bin/clang++ -std=c++20 -x cuda test.cpp
```
However, the reproducer above fails to compile in C++2b mode with Clang-16
```
% /install/llvm-16.0.0/bin/clang++ -std=c++2b -x cuda test.cpp
test.cpp:10:21: error: reference to __device__ function 'isfinite' in __host__ __device__ function
return std::isfinite(x);
^
test.cpp:13:9: note: called by 'main'
test(-1.0f);
^
/install/llvm-16.0.0/lib/clang/16/include/__clang_cuda_cmath.h:103:17: note: 'isfinite' declared here
__DEVICE__ bool isfinite(float __x) { return ::__finitef(__x); }
^
test.cpp:10:21: error: reference to __device__ function 'isfinite' in __host__ __device__ function
return std::isfinite(x);
^
test.cpp:14:9: note: called by 'main'
test(-2.0);
^
/install/llvm-16.0.0/lib/clang/16/include/__clang_cuda_cmath.h:107:17: note: 'isfinite' declared here
__DEVICE__ bool isfinite(double __x) { return ::__isfinited(__x); }
^
2 errors generated when compiling for host.
```
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