richardmembarth added a comment.
CUDA maps `__shared__` internally also to `__attribute__((shared))`:
#define __annotate__(a) \
__attribute__((a))
#define __location__(a) \
__annotate__(a)
...
#define __shared__ \
__location__(shared)
My guess is that Clang does it just the same way and only converts to
`LangAS::cuda_shared` for code generation in `GetGlobalVarAddressSpace`:
https://clang.llvm.org/doxygen/CodeGenModule_8cpp_source.html#l03305
In contrast, OpenCL uses keywords that are mapped directly to
`LangAS::opencl_local` etc.
Repository:
rC Clang
https://reviews.llvm.org/D54258
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