clFFT 编译问题：未定义对“clGetPlatformInfo”和其他 OpenCL 函数的引用答案

【问题标题】：clFFT compilation issue : undefined reference to `clGetPlatformInfo' and other OpenCL functionsclFFT 编译问题：未定义对“clGetPlatformInfo”和其他 OpenCL 函数的引用
【发布时间】：2019-06-25 00:26:13
【问题描述】：

我尝试构建 clFFT 库（用于使用 OpenCL 进行 FFT）并将示例包含在 clFFT git 中。

首先，进入/opt/，我做到了：

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，我这样称呼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AMD-APP-SDKInstaller-v3.0.130.136-GA-linux64.tar.bz2archive 安装了AMDAPPSDK-3.0。

一切似乎都对 clFFT 的编译有效，但它失败了：

4.1) 首先，在上面cmakecommand 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，我说的是：

-- 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) 启动make进入/opt/build/ 目录后，我收到以下警告：

$ 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哪里，似乎我构建的库 libclFFT.so.2.14.0 不包含对 OpenCL 基本函数的引用（如 clGetPlatformIDs 或 clCreateCommandQueue...）。

另外，我不知道为什么未定义引用的路径是上层的，即/usr/bin/ld: ../library/libclFFT.so.2.14.0，因为库是内置在/opt/build/library目录下的。

我希望能够很好地编译libclFFT.so，它考虑到路径OpenCL_INCLUDE_DIR 指示的OpenCL 标头和OpenCL_LIBRARY 指示的库。

我必须解决cmake 采用的路径问题，即：../library/libclFFT.so.2.14.0 并将来自AMDAPPSDK 的所有 OpenCL 函数包含到该库的构建中。

【问题讨论】：

你使用什么操作系统和编译器？
请致电make VERBOSE=1 - 您将获得编译和链接命令。之后您可能会看到如何自己解决问题...如果没有，请使用此新信息更新您的问题
@HEKTO。问题最终在 MacOS Catalina 上得到解决，但最后一个问题是：如何管理 MacOS 上用于 OpenCL 的 AMD APP SDK 的安装，是否默认安装？我没有看到很多关于此的文档？我意识到我有 /System/Library/Frameworks/OpenCL.framework 和 /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/OpenCL.frameworkdirectories 但我不确定是否必须安装另一个 AMD APP SDK 才能获得最后的 OpenCL 库？欢迎任何帮助。问候
我从来没有听说过在 MacOS 上使用 AMD APP SDK - 我相信这个（相当过时的）包是为 Windows 和 Linux 开发的。 MacOS 拥有（或拥有？）自己的 OpenCL 实现，应使用 -framework OpenCL 选项访问它
@HEKTO 谢谢，这是我的想法，但不确定。最初，我在 Linux 上使用 AMD APP SDK OpenCL。

标签： cmake compiler-errors shared-libraries opencl

【解决方案1】：

您机器上的cmake 设置应该有一个OpenCL finder，当cmake 执行clFFT 分发中的CMakeLists.txt 文件时，该命令由find_package(OpenCL) 调用（此命令也可以使用在您自己的CMakeLists.txt 文件中）。这个查找器只是一个名为FindOpenCL.cmake 的文件，它必须是cmake 配置的一部分。确保你有这个文件：

find /usr -name FindOpenCL.cmake

如果您有此查找器，则无需在 cmake 调用中设置变量 OpenCL_INCLUDE_DIR 和 OpenCL_LIBRARY - 查找器将找到所有需要的 OpenCL 路径。如果你有这个查找器但它不能正常工作 - 那么这将是它的开发人员的问题。如果您没有有这个查找器，那么在cmake 安装和/或设置中将会出现问题。这个查找器被描述为here。

根据我们在 cmets 中的对话，您尝试在 MacOS 上使用 AMD APP SDK v3.0 包 - 这无法正常工作，因为 AMD 仅支持 Windows 和 Linux 操作系统。这是可以理解的，因为 Apple 长期以来一直支持自己的 OpenCL - 请参阅 here。

【讨论】：