链接到libcuda.so的问题 [英] Problems Linking to libcuda.so

问题描述

我被看似是一个应该很容易诊断和修复的问题困住了。我有一个使用CUDA驱动程序API的C ++源文件。当我使用 nvcc 进行编译时，可执行文件就会生成并且可以正常工作。但是，当我尝试使用 g ++ 编译它时，链接器抱怨未定义的<> /usr/lib/libcuda.so ：

 未定义引用 cuDeviceGet'
。 ..未定义引用 cuDeviceComputeCapability'
 ...未定义引用 cuDeviceGetName'
 ...未定义引用 cuDeviceTotalMem_v2 '
 ...未定义引用 cuDeviceGetAttribute'
 ...未定义引用 cuDeviceGetAttribute'
 ...未定义引用 cuDeviceGetAttribute'
 ...未定义引用 cuDeviceGetAttribute'
 

我试图确保 / usr / lib 包含在库路径中（通过提供标记 -L / usr / lib ， -lcuda ，并将 / usr / lib 添加到 $ LIBRARY_PATH ）。但是，问题仍然存在。我确信 /usr/lib/libcuda.so 包含链接器抱怨的符号：

  $ nm -D /usr/lib/libcuda.so | grep cuDeviceGet 
 00000000000be410 T cuDeviceGet 
 00000000000bf120 T cuDeviceGetAttribute 
 00000000000d2e10 T cuDeviceGetByPCIBusId 
 00000000000be200 T cuDeviceGetCount 
 00000000000bdfa0 T cuDeviceGetName 
 00000000000d2bb0 T cuDeviceGetPCIBusId 
 00000000000bf380 T cuDeviceGetProperties 
 

我发现奇怪的是 nvcc 成功地编译了这个文件，但是 g ++ 不。你有什么想法可以解决这个问题吗？

非常感谢您的帮助！

-lcuda 标志必须在之后 文件名。否则，它将无法工作......编译器告诉我这个信息的一个大的突出警告将会非常感谢。那么，这是浪费两个小时。

I am stumped by what seems to be a problem that should be easy to diagnose and fix. I have a C++ source file that makes use of the CUDA Driver API. When I compile it using nvcc, the executable is produced and works without problems. However, when I try to compile it using g++, the linker complains about undefined references to symbols that are in /usr/lib/libcuda.so:

undefined reference to cuDeviceGet'
... undefined reference tocuDeviceComputeCapability'
... undefined reference to cuDeviceGetName'
... undefined reference tocuDeviceTotalMem_v2'
... undefined reference to cuDeviceGetAttribute'
... undefined reference tocuDeviceGetAttribute'
... undefined reference to cuDeviceGetAttribute'
... undefined reference tocuDeviceGetAttribute'

I tried to ensure that /usr/lib is included in the library path (by supplying the flags -L/usr/lib, -lcuda, and adding /usr/lib to $LIBRARY_PATH). However, the problem still persists. I am sure that /usr/lib/libcuda.so contains the symbols that the linker is complaining about:

$ nm -D /usr/lib/libcuda.so | grep cuDeviceGet
00000000000be410 T cuDeviceGet
00000000000bf120 T cuDeviceGetAttribute
00000000000d2e10 T cuDeviceGetByPCIBusId
00000000000be200 T cuDeviceGetCount
00000000000bdfa0 T cuDeviceGetName
00000000000d2bb0 T cuDeviceGetPCIBusId
00000000000bf380 T cuDeviceGetProperties

I find it strange that nvcc successfully compiles the file, but g++ does not. Do you have any idea as to how I can fix this problem?

Thank you very much for your help!

解决方案

Ok, the reason I was not able to compile the file was because the -lcuda flag has to come after the filename. Otherwise, it won't work... a large, prominent warning with the compiler telling me this information would have been much appreciated. Well, that was a waste of two hours.

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