cuda编译错误 ptxas fatal : Unresolved extern function xxxx

错误 ptxas fatal : Unresolved extern function xxxx"/>

cuda编译错误 ptxas fatal : Unresolved extern function xxxx

出现这个问题。找到了原因是，在global函数中调用了__device__函数，但是这两个文件不在同一个src文件里面。

The issue is that you defined a __device__ function in separate compilation unit from __global__that calls it. You need to either explicitely enable relocatable device code mode by adding -dc flag or move your definition to the same unit.

From nvcc documentation:

--device-c|-dc Compile each .c/.cc/.cpp/.cxx/.cu input file into an object file that contains relocatable device code. It is equivalent to --relocatable-device-code=true --compile.

See Separate Compilation and Linking of CUDA C++ Device Code for more information.

因此解决的方式有2个。

第一是两个函数放到同一个cu文件中。

第二是在cu文件属性页面选项卡中 cuda c/c++->common->Generate Relocatable Device Code 选择-rdc=true。允许重定位device代码编译。或者在整个工程的cuda c/c++项中配置这个-rdc=true.

解决问题。

其他参考

/

1) View -> Property Pages
2) Configuration Properties -> CUDA C/C++ -> Common -> Generate Relocatable Device Code -> Yes (-rdc=true)
3) Configuration Properties -> CUDA C/C++ -> Code Generation -> compute_35,sm_35
4) Configuration Properties -> Linker -> Input -> Additional Dependencies -> cudadevrt.lib