使用NVIDIA GPU无法对Cygwin中的OpenCL库进行链接

2024-05-20 • 问答

我正在尝试构建这个小的OpenCL项目：

https://bitbucket.org/Anteru/opencltutorial/src

在Windows上，在Cygwin中为

。这是一个玩具项目，具有一个.cpp文件和一个内核，以演示OpenCL的用法。因此，我下载了软件包并cmake。我收到错误消息：

CMake Error at /usr/share/cmake-3.14.5/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find OpenCL (missing: OPENCL_libraRY)
Call Stack (most recent call first):
  /usr/share/cmake-3.14.5/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindOpenCL.cmake:35 (find_package_handle_standard_args)
  CMakeLists.txt:6 (FIND_PACKAGE)

我不会对此感到厌恶，而是继续更改我的CMakeCache.txt，以便代替：

OPENCL_libraRY:FILEPATH=OPENCL_libraRY-NOTFOUND

我做到了：

OPENCL_libraRY:FILEPATH=/cygdrive/c/Program Files/NVIDIA Corporation/OpenCL/OpenCL.dll

（这是NVIDIA OpenCL DLL的合法路径）好，所以现在CMake配置成功结束。 main.cpp文件已编译，但是链接失败！：

/usr/bin/c++.exe   -Wl,--enable-auto-import CMakeFiles/clTut.dir/main.cpp.o  -o clTut.exe -Wl,--out-implib,libclTut.dll.a -Wl,--major-image-version,--minor-image-version,0 "/cygdrive/c/Program Files/NVIDIA Corporation/OpenCL/OpenCL.dll"
CMakeFiles/clTut.dir/main.cpp.o:main.cpp:(.text+0x610): undefined reference to `clGetPlatformInfo'
CMakeFiles/clTut.dir/main.cpp.o:main.cpp:(.text+0x610): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `clGetPlatformInfo'
CMakeFiles/clTut.dir/main.cpp.o:main.cpp:(.text+0x659): undefined reference to `clGetPlatformInfo'
CMakeFiles/clTut.dir/main.cpp.o:main.cpp:(.text+0x659): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `clGetPlatformInfo'

等等，许多这样的错误。

为什么会出现这些错误，如何解决？是因为我使用Cygwin是ELF / WinPE不兼容的结果吗？

其他信息：

我的机器同时集成了Intel Graphics（630-咖啡湖）和Quadro P1000。
我已将CUDA 10.2和AMD CodeXL安装（默认情况下）到其默认位置。

寻找一个OpenCL DLL文件，我发现：

$ locate OpenCL.dll
/cygdrive/c/Program Files (x86)/CodeXL/spies/OpenCL.dll
/cygdrive/c/Program Files (x86)/CodeXL/spies64/OpenCL.dll
/cygdrive/c/Program Files/NVIDIA Corporation/OpenCL/OpenCL.dll
/cygdrive/c/Windows/LastGood/system32/OpenCL.dll
/cygdrive/c/Windows/LastGood/SysWow64/OpenCL.dll
/cygdrive/c/Windows/System32/OpenCL.dll
/cygdrive/c/Windows/SysWOW64/OpenCL.dll

$ cygcheck -cd | grep -i opencl libOpenCL-devel 2.2.12-1 libOpenCL1 2.2.12-1 $ unzip Anteru-opencltutorial-cb1df4439f83.zip Archive: Anteru-opencltutorial-cb1df4439f83.zip inflating: Anteru-opencltutorial-cb1df4439f83/.hg_archival.txt ... inflating: Anteru-opencltutorial-cb1df4439f83/main.cpp inflating: Anteru-opencltutorial-cb1df4439f83/test.ppm $ cd Anteru-opencltutorial-cb1df4439f83 /pub/tmp/Anteru-opencltutorial-cb1df4439f83 $ cmake . -- The C compiler identification is GNU 7.4.0 -- The CXX compiler identification is GNU 7.4.0 ... -- Found OpenCL: /usr/lib/libOpenCL.dll.a -- Configuring done -- Generating done -- Build files have been written to: /pub/tmp/Anteru-opencltutorial-cb1df4439f83 $ make Scanning dependencies of target clTut [ 50%] Building CXX object CMakeFiles/clTut.dir/main.cpp.o /pub/tmp/Anteru-opencltutorial-cb1df4439f83/main.cpp: In function ‘int main()’: /pub/tmp/Anteru-opencltutorial-cb1df4439f83/main.cpp:249:9: warning: ‘_cl_mem* clCreateImage2D(cl_context,cl_mem_flags,const cl_image_format*,size_t,void*,cl_int*)’ is deprecated [-Wdeprecated-declarations] &error); ^ In file included from /pub/tmp/Anteru-opencltutorial-cb1df4439f83/main.cpp:10:0: ~~~~~~~^~~~~~ ... [100%] Linking CXX executable clTut.exe [100%] Built target clTut

使用NVIDIA GPU无法对Cygwin中的OpenCL库进行链接

a6733525 回答：使用NVIDIA GPU无法对Cygwin中的OpenCL库进行链接

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