[BUG]: Second argument to ptxas_options fails to parse

[capybara-club]

Is this a duplicate?

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Type of Bug

Compile-time Error

Component

cuda.core

Describe the bug

It seems you can't pass a list with more than 1 option to ptxas_options=[...]

How to Reproduce

# Copyright (c) 2024-2025, NVIDIA CORPORATION & AFFILIATES. ALL RIGHTS RESERVED.
#
# SPDX-License-Identifier: Apache-2.0

import sys

from cuda.core.experimental import Device, LaunchConfig, Program, ProgramOptions, launch

# compute out = a * x + y
code = """
template<typename T>
__global__ void saxpy(const T a,
 const T* x,
 const T* y,
 T* out,
 size_t N) {
 const unsigned int tid = threadIdx.x + blockIdx.x * blockDim.x;
 for (size_t i=tid; i<N; i+=gridDim.x*blockDim.x) {
 out[i] = a * x[i] + y[i];
 }
}
"""

dev = Device()
dev.set_current()
s = dev.create_stream()

# prepare program
arch = "".join(f"{i}" for i in dev.compute_capability)
program_options = \
 ProgramOptions(
 std="c++11", 
 arch=f"sm_{arch}",

 # ptxas_options=["-O2"] # compiles!
 # ptxas_options=["-v"] # compiles!
 ptxas_options=["-v","-O2"] # "nvrtc: error: unrecognized option -O2 found"

 )

prog = Program(code, code_type="c++", options=program_options)
mod = prog.compile(
 "cubin",
 logs=sys.stdout,
 name_expressions=("saxpy<float>", "saxpy<double>"),
)

Expected behavior

from _program.py Attribuytes description:

 ptxas_options : Union[str, List[str]], optional
 Specify one or more options directly to ptxas, the PTX optimizing assembler. Options should be strings.
 For example ["-v", "-O2"].
 Default: None

Operating System

WSL2

nvidia-smi output

+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 575.57.04 Driver Version: 576.52 CUDA Version: 12.9 |
|-----------------------------------------+------------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+========================+======================|
| 0 NVIDIA GeForce RTX 4090 On | 00000000:01:00.0 On | Off |
| 0% 46C P0 82W / 450W | 1537MiB / 24564MiB | 1% Default |
| | | N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=========================================================================================|
| No running processes found |
+-----------------------------------------------------------------------------------------+