cmake - clFFT编译问题: undefined reference to `clGetPlatformInfo' and other OpenCL functions

Question

我尝试构建clFFT库(用于使用OpenCL进行FFT)和clFFT git中包含的示例。

首先，进入/opt/，我做了:

git clone https://github.com/clMathLibraries/clFFT.git

之后，总是进入/opt/目录，我做了:$ mkdir build && cd build/

从这里开始，我这样叫cmake:

cmake -DOpenCL_INCLUDE_DIR=/opt/AMDAPPSDK-3.0/include -DOpenCL_LIBRARY=/opt/AMDAPPSDK-3.0/lib/x86_64 ../clFFT/src/确实，在 /opt/目录中，我已经从 AMDAPPSDK-3.0文件库中安装了 AMD-APP-SDKInstaller-v3.0.130.136-GA-linux64.tar.bz2。

一切似乎对clFFT的编译都是有效的，但失败了:

4.1)首先，在上述 cmake命令的末尾，我得到:

 cmake -DOpenCL_INCLUDE_DIR=/opt/AMDAPPSDK-3.0/include -DOpenCL_LIBRARY=/opt/AMDAPPSDK-3.0/lib/x86_64 ../clFFT/src/
-- The C compiler identification is GNU 8.3.0
-- The CXX compiler identification is GNU 8.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- UNICODE feature disabled on linux
-- 64bit build - FIND_LIBRARY_USE_LIB64_PATHS TRUE
-- Could NOT find Boost
CMake Warning at CMakeLists.txt:146 (message):
  Try setting Boost_DEBUG and Boost_DETAILED_FAILURE_MSG for more information


-- Looking for CL_VERSION_2_2
-- Looking for CL_VERSION_2_2 - not found
-- Looking for CL_VERSION_2_1
-- Looking for CL_VERSION_2_1 - not found
-- Looking for CL_VERSION_2_0
-- Looking for CL_VERSION_2_0 - found
-- Found OpenCL: /opt/AMDAPPSDK-3.0/lib/x86_64 (found version "2.0") 
-- Found FFTW: /usr/lib/x86_64-linux-gnu/libfftw3f.so;/usr/lib/x86_64-linux-gnu/libfftw3.so  
-- Detected GNU fortran compiler.
-- CMAKE_CXX_COMPILER flags: -m64 -pthread 
-- CMAKE_CXX_COMPILER debug flags: -g
-- CMAKE_CXX_COMPILER release flags: -O3 -DNDEBUG
-- CMAKE_CXX_COMPILER relwithdebinfo flags: -O2 -g -DNDEBUG
-- CMAKE_EXE_LINKER link flags: 
FFT clients will NOT be built
GoogleTest unit tests will NOT be built
FFT callback client will NOT be built
-- Configuring done
WARNING: Target "clFFT" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "clFFT" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "StatTimer" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "StatTimer" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "example_examples_fft2d" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "example_examples_fft3d" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "example_examples_fft1d" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
-- Generating done
-- Build files have been written to: /opt/build

更准确地说，我是在谈论:

-- Configuring done
WARNING: Target "clFFT" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "clFFT" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "StatTimer" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "StatTimer" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "example_examples_fft2d" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "example_examples_fft3d" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "example_examples_fft1d" requests linking to directory "/opt/AMDAPPSDK-3.0/lib/x86_64".  Targets may link only to libraries.  CMake is dropping the item.
-- Generating done
-- Build files have been written to: /opt/build

4.2)将 make启动到 /opt/build/目录后，出现以下警告:

$ make
Scanning dependencies of target clFFT
[  3%] Building CXX object library/CMakeFiles/clFFT.dir/transform.cpp.o
In file included from /opt/clFFT/src/library/repo.h:26,
                 from /opt/clFFT/src/library/transform.cpp:23:
/opt/clFFT/src/library/../statTimer/statisticalTimer.GPU.h:132:42: warning: ignoring attributes on template argument âcl_uintâ {aka âunsigned intâ} [-Wignored-attributes]
  typedef std::pair< std::string, cl_uint > idPair;
                                          ^
[  7%] Building CXX object library/CMakeFiles/clFFT.dir/accessors.cpp.o
In file included from /opt/clFFT/src/library/repo.h:26,
                 from /opt/clFFT/src/library/accessors.cpp:23:
/opt/clFFT/src/library/../statTimer/statisticalTimer.GPU.h:132:42: warning: ignoring attributes on template argument âcl_uintâ {aka âunsigned intâ} [-Wignored-attributes]
  typedef std::pair< std::string, cl_uint > idPair;
                                          ^
[ 11%] Building CXX object library/CMakeFiles/clFFT.dir/plan.cpp.o
In file included from /opt/clFFT/src/library/repo.h:26,
                 from /opt/clFFT/src/library/plan.cpp:25:
/opt/clFFT/src/library/../statTimer/statisticalTimer.GPU.h:132:42: warning: ignoring attributes on template argument âcl_uintâ {aka âunsigned intâ} [-Wignored-attributes]
  typedef std::pair< std::string, cl_uint > idPair;
                                          ^
[ 15%] Building CXX object library/CMakeFiles/clFFT.dir/repo.cpp.o
In file included from /opt/clFFT/src/library/repo.h:26,
                 from /opt/clFFT/src/library/repo.cpp:22:

...    

最后，我得到以下结束错误:

[ 80%] Building C object examples/CMakeFiles/example_examples_fft2d.dir/fft2d.c.o
/opt/clFFT/src/examples/fft2d.c: In function âmainâ:
/opt/clFFT/src/examples/fft2d.c:63:5: warning: âclCreateCommandQueueâ is deprecated [-Wdeprecated-declarations]
     queue = clCreateCommandQueue( ctx, device, 0, &err );
     ^~~~~
In file included from /opt/clFFT/src/include/clFFT.h:33,
                 from /opt/clFFT/src/examples/fft2d.c:21:
/opt/AMDAPPSDK-3.0/include/CL/cl.h:1359:1: note: declared here
 clCreateCommandQueue(cl_context                     /* context */,
 ^~~~~~~~~~~~~~~~~~~~
[ 84%] Linking C executable examples/fft2d
/usr/bin/ld: CMakeFiles/example_examples_fft2d.dir/fft2d.c.o: in function `main':
fft2d.c:(.text.startup+0x76): undefined reference to `clGetPlatformIDs'
/usr/bin/ld: fft2d.c:(.text.startup+0x9d): undefined reference to `clGetPlatformInfo'
/usr/bin/ld: fft2d.c:(.text.startup+0xd1): undefined reference to `clGetDeviceIDs'
/usr/bin/ld: fft2d.c:(.text.startup+0xf6): undefined reference to `clGetDeviceInfo'
/usr/bin/ld: fft2d.c:(.text.startup+0x13c): undefined reference to `clCreateContext'
/usr/bin/ld: fft2d.c:(.text.startup+0x152): undefined reference to `clCreateCommandQueue'
/usr/bin/ld: fft2d.c:(.text.startup+0x215): undefined reference to `clCreateBuffer'
/usr/bin/ld: fft2d.c:(.text.startup+0x241): undefined reference to `clEnqueueWriteBuffer'
/usr/bin/ld: fft2d.c:(.text.startup+0x307): undefined reference to `clFinish'
/usr/bin/ld: fft2d.c:(.text.startup+0x334): undefined reference to `clEnqueueReadBuffer'
/usr/bin/ld: fft2d.c:(.text.startup+0x3a7): undefined reference to `clReleaseMemObject'
/usr/bin/ld: fft2d.c:(.text.startup+0x3cc): undefined reference to `clReleaseCommandQueue'
/usr/bin/ld: fft2d.c:(.text.startup+0x3d5): undefined reference to `clReleaseContext'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clBuildProgram'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clEnqueueNDRangeKernel'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clSetKernelArg'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clGetCommandQueueInfo'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clReleaseEvent'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clGetProgramBuildInfo'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clGetContextInfo'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clCreateProgramWithBinary'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clRetainContext'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clReleaseProgram'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clGetProgramInfo'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clCreateKernel'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clCreateProgramWithSource'
/usr/bin/ld: ../library/libclFFT.so.2.14.0: undefined reference to `clReleaseKernel'
collect2: error: ld returned 1 exit status
make[2]: *** [examples/CMakeFiles/example_examples_fft2d.dir/build.make:85: examples/examples/fft2d] Error 1
make[1]: *** [CMakeFiles/Makefile2:223: examples/CMakeFiles/example_examples_fft2d.dir/all] Error 2
make: *** [Makefile:152: all] Error 2

我不明白这些错误可能来自何处，似乎我建立的 libclFFT.so.2.14.0库不包含对OpenCL基本功能的引用(例如 clGetPlatformIDs或 clCreateCommandQueue ...)。
而且，我不知道为什么 undefined reference 的路径是上层的 /usr/bin/ld: ../library/libclFFT.so.2.14.0，因为该库内置在 /opt/build/library目录中。
我希望能够很好地编译 libclFFT.so，其中考虑了路径 OpenCL_INCLUDE_DIR和 OpenCL_LIBRARY指示的OpenCL header 。
我必须解决 cmake采取的路径问题(即 ../library/libclFFT.so.2.14.0)，并将 AMDAPP SDK中的所有OpenCL函数包含到该库的构建中。

Answer 1

您机器上的cmake设置应该具有一个OpenCL查找程序，当find_package(OpenCL)执行cmake发行版中的CMakeLists.txt文件时，该命令由clFFT命令调用(此命令也可以在您自己的CMakeLists.txt文件中使用)。该查找程序只是一个名为FindOpenCL.cmake的文件，该文件必须是cmake配置的一部分。确保您具有以下文件:

find /usr -name FindOpenCL.cmake

如果您有此查找程序，则无需在 OpenCL_INCLUDE_DIR调用中设置变量 OpenCL_LIBRARY和 cmake-查找程序将找到所有所需的OpenCL路径。如果您有这个查找程序，但是它不能正常工作-那么对于它的开发人员来说将是一个问题。如果您没有此查找器，那么在 cmake安装和/或设置中会出现问题。这个发现者描述为 here。

根据我们在评论中的对话，您尝试在MacOS上使用AMD APP SDK v3.0软件包-无法运行，因为AMD仅支持Windows和Linux操作系统。这是可以理解的，因为Apple拥有自己的OpenCL支持悠久的历史-请参阅 here。