libcudacxx within nvidia/CCCL encounters the following compilation error with the Visual Studio 2019 and CUDA <= 11.2.
error : identifier "__builtin_is_constant_evaluated" is undefined
This repository uses GitHub Actions windows-2019 runners to reproduce this issue across each CUDA 11.x minor release, reproducing the issue with MSVC 19.29.30153.0 (the version on github actions on 2023-12-05), using CCCL's current main (9eca399e5c37b462749ae0ba1b9ffd108191969f).
CCCL is documented as being backwards compatible with current and older major CUDA versions (i.e. 11 and 12 as of 2023-12) and as supporting the same (host compilers as the cuda toolkit)[https://github.com/nvidia/cccl?tab=readme-ov-file#host-compilers]
I.e. Visual Studio 2019 should be supported with CUDA 11.1+ (11.0 is excluded due to compiler issues).
This demonstration does not specify a c++ standard for CUDA nor C++, however this was discovered in a separate repository which sets c++17 as the standard, the latest compatible with CUDA 11.x.
- With Visual Studio 2019 and CUDA <= 11.2 installed
- Clone nvidia/CCCL
- Navigate to
examples/example_project(to avoid an llvm dependency) cmake -B build -S .cmake --build build
For Visual Studio 2019 with CUDA 11.1 and 11.2 (and 11.0 but that's not a supported target) for example, this will result in a compilation error, e.g:
D:\a\cccl-is-constant-evaluated-mwe\cccl-is-constant-evaluated-mwe\cccl\examples\example_project\build\_deps\cccl-src\libcudacxx\include\cuda\std\detail\libcxx\include\__type_traits/is_constant_evaluated.h(31): error : identifier "__builtin_is_constant_evaluated" is undefined [D:\a\cccl-is-constant-evaluated-mwe\cccl-is-constant-evaluated-mwe\cccl\examples\example_project\build\example_project.vcxproj]This repository contains a CI workflow, .github/workflows/demo.yml which demonstrates this problem using a matrix of visual studio, CUDA and CCCL versions.
See the latest actions run for the matrix showing which versions do and do not compile.
For commit 7dae562 of this repository, ci demonstrated that:
| CCCL | CUDA | Visual Studio | Compiled? |
|---|---|---|---|
| main (9eca399e) | 11.0 | 19.29.30153.0 | No |
| main (9eca399e) | 11.1 | 19.29.30153.0 | No |
| main (9eca399e) | 11.2 | 19.29.30153.0 | No |
| main (9eca399e) | 11.3 | 19.29.30153.0 | Yes |
| main (9eca399e) | 11.4 | 19.29.30153.0 | Yes |
| main (9eca399e) | 11.5 | 19.29.30153.0 | Yes |
| main (9eca399e) | 11.6 | 19.29.30153.0 | Yes |
| main (9eca399e) | 11.7 | 19.29.30153.0 | Yes |
| main (9eca399e) | 11.8 | 19.29.30153.0 | Yes |