https://llvm.org/bugs/show_bug.cgi?id=30567
Bug ID: 30567
Summary: Cuda Nested lambda (lambda inside a device function)
requires __device__ annotation
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: CUDA
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 17381
--> https://llvm.org/bugs/attachment.cgi?id=17381&action=edit
Reproducer example
With NVCC lambdas which are declared inside a __device__ (or __host__
__device__ ) function automatically get promoted to __device__ or __host__
__device__. In fact one is not even allowed to mark the operator. In clang one
must mark it though. This situation makes me write a lot of ifdefs.
Would it be possible to make lambda operators inherit the the attribute from
its scope if not explicitly specified? I am attaching a reproducer
demonstrating what I currently need to do to make it work.
Here are the error messages from NVCC if I use "[=] (const int& i) __device__"
main.cpp(14): warning: a __host__ function("lambda []::operator()") redeclared
with __device__, hence treated as a __host__ __device__ function
main.cpp(16): error: The operator() function for a lambda cannot be explicitly
annotated with execution space annotations (__host__/__device__/__global__),
the annotations are derived from its closure class
1 error detected in the compilation of
"/tmp/tmpxft_0001e52a_00000000-9_main.cpp1.ii".
and if I use "[=] __device__ (const int& i)":
main.cpp(14): error: An explicit __device__ lambda must be defined inside a
__host__ or __host__ __device__ function
1 error detected in the compilation of
"/tmp/tmpxft_0001e53a_00000000-9_main.cpp1.ii".
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