Error : An extended __device__ lambda cannot first-capture variable in constexpr-if context

Accelerated Computing CUDA CUDA NVCC Compiler
1

I’ve updated the CUDA SDK from 11.x to 12.6, and I’m getting the error in the title. Can anyone explain in detail what it means? Thanks!

2

Well, ChatGPT answered this with:

This error means that in CUDA, extended __device__ lambdas (lambdas that can run on the GPU) are not allowed to capture variables within a constexpr if statement. CUDA has certain restrictions on what can be captured by device lambdas, and capturing variables in the context of constexpr if introduces complexity that is not currently supported by the CUDA compiler.

To resolve this, try refactoring your code so that the lambda does not rely on capturing variables in a constexpr if context or move the logic outside the lambda.

Which I’ll take as the correct answer unless someone says it’s not.

3

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.