PyCuda C++ kernel "error: this declaration may not have extern "C" linkage"

Accelerated Computing HPC Compilers nvc, nvc++ and nvfortran
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1

I tried using std::tuple in my kernel code, but received many error: this declaration may not have extern "C" linkage errors that pointed to utility and tuple

It complains on the include. The following repros for me.

from pycuda.compiler import SourceModule
mod = SourceModule("""#include <tuple>""")

Do I need to do something special in my kernel code or in my Python code to specify I want to use the C++ compiler?

Cuda version: 11.8

PyCuda version: 2022.2.1

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Hi john.novak1024,

We may need to move your post to another forum since I’m not familiar with Python or pyCUDA. However, I just looked at pyCUDA’s Documentation for SourceModule:
https://documen.tician.de/pycuda/driver.html#pycuda.compiler.SourceModule

Where it says:

Unless no_extern_c is True , the given source code is wrapped in extern “C” { … } to prevent C++ name mangling.

Given “tuple” uses templating, it can be wrapped in an extern “C” block.

Can you try adding “no_extern_c=True” to see if it works around this issue?

-Mat

3

That worked! Thanks! Of course, now there are issues with name mangling, but it looks like my issues can be fixed by following the answers found at

cuda - PyCUDA either fails to find function in NVIDIA source code or throws ‘may not have extern “C” Linkage’ error - Stack Overflow

and

cuda - How to invoke a constexpr function on both device and host? - Stack Overflow