cmake config_error ai_generated true

CMake Error: CUDA_ARCHITECTURES is empty for target "mycudatarget"

ID: cmake/cuda-architectures-empty

Also available as: JSON · Markdown · 中文

90%Fix Rate

88%Confidence

1Evidence

2023-12-01First Seen

Version Compatibility

Version	Status	Introduced	Deprecated	Notes
CMake 3.18	active	—	—	—
CMake 3.19	active	—	—	—
CMake 3.20	active	—	—	—

Root Cause

CMake 3.18+ requires CUDA_ARCHITECTURES to be set for all CUDA-enabled targets; an empty value or unset variable triggers this error to prevent unsupported architecture code.

generic

中文

CMake 3.18+ 要求为所有启用 CUDA 的目标设置 CUDA_ARCHITECTURES；空值或未设置变量会触发此错误，以防止不支持的架构代码。

Official Documentation

https://cmake.org/cmake/help/latest/prop_tgt/CUDA_ARCHITECTURES.html

Workarounds

90% success set_target_properties(mycudatarget PROPERTIES CUDA_ARCHITECTURES "75;80") # Or use the native arch detection: set(CMAKE_CUDA_ARCHITECTURES "native")
```
set_target_properties(mycudatarget PROPERTIES CUDA_ARCHITECTURES "75;80")
# Or use the native arch detection:
set(CMAKE_CUDA_ARCHITECTURES "native")
```
85% success set(CMAKE_CUDA_ARCHITECTURES "75;80") add_library(mycudatarget CUDA mycuda.cu)
```
set(CMAKE_CUDA_ARCHITECTURES "75;80")
add_library(mycudatarget CUDA mycuda.cu)
```

中文步骤

set_target_properties(mycudatarget PROPERTIES CUDA_ARCHITECTURES "75;80")
# Or use the native arch detection:
set(CMAKE_CUDA_ARCHITECTURES "native")

set(CMAKE_CUDA_ARCHITECTURES "75;80")
add_library(mycudatarget CUDA mycuda.cu)

Dead Ends

Common approaches that don't work:

100% fail
CMake interprets OFF as an empty string, still triggering the error.
100% fail
An empty string is still empty; CMake requires a non-empty list of architectures.