OpenBLAS:改进OpenBLASConfig.cmake生成方式,解除cmake脚本的路径依赖

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问题描述

当我们用OpenBLAS提供的Makefile进行编译,并用make install PREFIX=/you/install/path,安装到指定的路径时,你会发现,/you/install/path/lib/cmake/openblas/OpenBLASConfig.cmake文件中OpenBLAS_INCLUDE_DIRS和OpenBLAS_LIBRARIES的值都是绝对路径,如下:

/you/install/path/lib/cmake/openblas/OpenBLASConfig.cmake
(linux下生成动态库)

  1. SET(OpenBLAS_VERSION "0.2.18")
  2. SET(OpenBLAS_INCLUDE_DIRS /home/hadoop/Desktop/caffe-static/release/OpenBLAS_linux_x86_64/include)
  3. SET(OpenBLAS_LIBRARIES /home/hadoop/Desktop/caffe-static/release/OpenBLAS_linux_x86_64/bin/libopenblas.so)

(linux下生成静态库)

  1. SET(OpenBLAS_VERSION "0.2.18")
  2. SET(OpenBLAS_INCLUDE_DIRS /home/hadoop/Desktop/caffe-static/release/OpenBLAS_linux_x86_64/include)
  3. SET(OpenBLAS_LIBRARIES /home/hadoop/Desktop/caffe-static/release/OpenBLAS_linux_x86_64/lib/libopenblas.a)

(windows下生成动态库)

  1. SET(OpenBLAS_VERSION "0.2.18")
  2. SET(OpenBLAS_INCLUDE_DIRS D:/caffe-static/release/OpenBLAS_windows_vc140_x86_mt/include)
  3. SET(OpenBLAS_LIBRARIES D:/caffe-static/release/OpenBLAS_windows_vc140_x86_mt/bin/libopenblas.dll)
@H_404_58@

关于windows下如何用MinGW编译OpenBLAS,参见我的另一篇博客《Windows下MSYS2中编译OpenBLAS过程记录》

如果你编译OpenBLAS只是在本机使用,那没啥问题,如果想把这个编译好的OpenBLAS 移到别的位置或提供给别人使用,并且也是用cmake编译项目。那么问题就来了,因为OpenBLASConfig.cmake中的路径依赖问题,导致cmake脚本中调用find_package( OpenBlas NO_MODULE )返回的OpenBLAS_LIBRARIES和OpenBLAS_LIBRARIES的值都是错的!

而且你发现没有?上面Windows下生成的OpenBLASConfig.cmake中OpenBLAS_LIBRARIES的值居然是.dll的路径。而不是动态库导入库(import library)(.dll.a)的路径,也就是说OpenBLAS在生成OpenBLASConfig.cmake没有考虑到linux和windows的区别,只是按linux的方式将OpenBLAS_LIBRARIES置为静态库/动态库(.a,.so,dll)的路径。

如果你是用手工在Visual Studio中创建工程并设置工程参数,那么这都不是问题,对你没有任何影响,但如果你像我一样,用cmake进行工程编译,这是个很要命的问题,因为cmake根据这些错误的信息无法生成正确的Makefile,当然也不能正常编译。

原因分析

怎么办呢?指望OpenBLAS官方修改这个问题怕是来不及了,只能自己想办法解决
于是我仔细研究了OpenBLAS的Makefile的体系。算是基本搞清楚了OpenBLAS源码下那一大堆Makefile.*的作用。最终找到了问题的关键点:
Makefile.install 这个文件是OpenBLAS的安装脚本,当执行 make install时其实就是执行这个脚本来执行安装工作的。

而在这其中生成OpenBLASConfig.cmake的代码就是如下几行(line 97-116 OpenBLAS 0.2.18)
(中文注释为本文作者所加)

  1. #Generating OpenBLASConfig.cmake
  2. @echo Generating $(OPENBLAS_CMAKE_CONFIG) in $(DESTDIR)$(OPENBLAS_CMAKE_DIR)
  3. # 对应OpenBLASConfig.cmake中line 1
  4. @echo "SET(OpenBLAS_VERSION \"${VERSION}\")" > $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  5. # 对应OpenBLASConfig.cmake中line 2
  6. @echo "SET(OpenBLAS_INCLUDE_DIRS ${OPENBLAS_INCLUDE_DIR})" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  7.  
  8. ifndef NO_SHARED
  9. #ifeq logical or
  10. # 判断操作系统将OpenBLAS_LIBRARIES置为动态库文件路径
  11. ifeq ($(OSNAME),$(filter $(OSNAME),Linux FreeBSD NetBSD))
  12. # 对应OpenBLASConfig.cmake中line 3
  13. @echo "SET(OpenBLAS_LIBRARIES ${OPENBLAS_LIBRARY_DIR}/$(LIBPREFIX).so)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  14. endif
  15. ifeq ($(OSNAME),WINNT CYGWIN_NT))
  16. # 对应OpenBLASConfig.cmake中line 3
  17. # 这里 LIBDLLNAME = $(LIBPREFIX).dll 参见 Makefile.system
  18. @echo "SET(OpenBLAS_LIBRARIES ${OPENBLAS_BINARY_DIR}/$(LIBDLLNAME))" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  19. endif
  20. ifeq ($(OSNAME),Darwin)
  21. # 对应OpenBLASConfig.cmake中line 3
  22. @echo "SET(OpenBLAS_LIBRARIES ${OPENBLAS_LIBRARY_DIR}/$(LIBPREFIX).dylib)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  23. endif
  24. else
  25. # 将OpenBLAS_LIBRARIES置为静态库文件路径
  26. #only static
  27. # 对应OpenBLASConfig.cmake中line 3
  28. @echo "SET(OpenBLAS_LIBRARIES ${OPENBLAS_LIBRARY_DIR}/$(LIBPREFIX).$(LIBSUFFIX))" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  29. endif

OPENBLAS_INCLUDE_DIR,OPENBLAS_LIBRARY_DIR,OPENBLAS_BINARY_DIR在Makefile.install文件开头定义 (line 8-10 OpenBLAS 0.2.18)

上面的三行@echo代码清晰的对应着OpenBLASConfig.cmake中的三行代码,由此我们理解为什么OpenBLASConfig.cmake中的路径都是绝对路径,而且windows下OpenBLAS_LIBRARIES的值是.dll文件的路径了。

解决方法

原因搞清楚就好办了,要解决问题,只要修改上面这段代码,改进生成OpenBLASConfig.cmake的逻辑就可以了。

以下是上面代码(Makefile.install)修改后的版本:

  1. #Generating OpenBLASConfig.cmake
  2. # modified by guyadong for windows build
  3. @echo Generating $(OPENBLAS_CMAKE_CONFIG) in $(DESTDIR)$(OPENBLAS_CMAKE_DIR)
  4. @echo "SET(OpenBLAS_VERSION \"${VERSION}\")" > $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  5. @echo "# modified by guyadong,use relative path instead of absolute path" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  6. @echo "# Compute the installation prefix relative to this file." >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  7. @echo "get_filename_component(_IMPORT_PREFIX \"\$${CMAKE_CURRENT_LIST_DIR}\" PATH)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  8. @echo "get_filename_component(_IMPORT_PREFIX \"\$${_IMPORT_PREFIX}\" PATH)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  9. @echo "get_filename_component(_IMPORT_PREFIX \"\$${_IMPORT_PREFIX}\" PATH)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  10. @echo "if(_IMPORT_PREFIX STREQUAL \"/\")" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  11. @echo " set(_IMPORT_PREFIX \"\")" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  12. @echo "endif()" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  13. @echo "SET(OpenBLAS_INCLUDE_DIRS \$${_IMPORT_PREFIX}/include)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  14.  
  15. ifndef NO_SHARED
  16. #ifeq logical or
  17. ifeq ($(OSNAME),Linux FreeBSD NetBSD))
  18. @echo "SET(OpenBLAS_LIBRARIES \$${_IMPORT_PREFIX}/lib/$(LIBPREFIX).so)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  19. endif
  20. ifeq ($(OSNAME),WINNT CYGWIN_NT))
  21. # windows下编译时生成条件判断语句
  22. @echo "# use dynamic import library if MSVC" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  23. @echo "if(MSVC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  24. @echo " SET(OpenBLAS_LIBRARIES \$${_IMPORT_PREFIX}/lib/$(LIBDLLNAME).a)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  25. @echo "else(MSVC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  26. @echo " SET(OpenBLAS_LIBRARIES \$${_IMPORT_PREFIX}/bin/$(LIBDLLNAME))" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  27. @echo "endif(MSVC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  28. @echo "SET(OPENBLAS_IS_DYNAMIC true)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  29. endif
  30. ifeq ($(OSNAME),Darwin)
  31. @echo "SET(OpenBLAS_LIBRARIES \$${_IMPORT_PREFIX}/lib/$(LIBPREFIX).dylib)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  32. endif
  33. else
  34. #only static
  35. @echo "SET(OpenBLAS_LIBRARIES \$${_IMPORT_PREFIX}/lib/$(LIBPREFIX).$(LIBSUFFIX))" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  36. # windows下编译时生成条件判断语句
  37. ifeq ($(OSNAME),WINNT CYGWIN_NT))
  38. @echo "if(MSVC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  39. @echo " message(STATUS \"OpenBLAS_LIBRARIES(static library):\$${OpenBLAS_LIBRARIES}\" )" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  40. @echo " message(FATAL_ERROR \"With Visual Studio,only dynamic linking is supported,please reinstall OpenBLAS without NO_STATIC=1\" )" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  41. @echo "endif(MSVC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  42. @echo "SET(OPENBLAS_IS_DYNAMIC false)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  43. endif
  44. endif
  45. ifeq ($(OSNAME),WINNT CYGWIN_NT))
  46. @echo "# if OpenBlas_USE_STATIC is true,force to use static library with MinGW" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  47. @echo "if(OPENBLAS_IS_DYNAMIC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  48. @echo " if(EXISTS \"\$${_IMPORT_PREFIX}/lib/$(LIBPREFIX).$(LIBSUFFIX)\" AND OpenBlas_USE_STATIC AND NOT MSVC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  49. @echo " MESSAGE(STATUS \"use OpenBlas static library\")" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  50. @echo " SET(OpenBLAS_LIBRARIES \$${_IMPORT_PREFIX}/lib/$(LIBPREFIX).$(LIBSUFFIX))" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  51. @echo " endif()" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  52. @echo "endif(OPENBLAS_IS_DYNAMIC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  53. @echo "unset(OPENBLAS_IS_DYNAMIC)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)
  54. endif
  55. @echo "unset(_IMPORT_PREFIX)" >> $(DESTDIR)$(OPENBLAS_CMAKE_DIR)/$(OPENBLAS_CMAKE_CONFIG)

经过上面的修改,再重新执行make install PREFIX=/you/install/path,生成的OpenBLASConfig.cmake(中文注释为本文作者所加)
(linux下生成静态态库)

  1. # modified by guyadong,use relative path instead of absolute path
  2. # Compute the installation prefix relative to this file.
  3. # 三次调用 get_filename_component 计算 OpenBLAS安装路径
  4. # _IMPORT_PREFIX为OpenBLAS安装路径
  5. get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_DIR}" PATH)
  6. get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
  7. get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
  8. if(_IMPORT_PREFIX STREQUAL "/")
  9. set(_IMPORT_PREFIX "")
  10. endif()
  11. SET(OpenBLAS_INCLUDE_DIRS ${_IMPORT_PREFIX}/include)
  12. SET(OpenBLAS_LIBRARIES ${_IMPORT_PREFIX}/lib/libopenblas.a)
  13. unset(_IMPORT_PREFIX)

(windows下生成动态库)

  1. # modified by guyadong,use relative path instead of absolute path
  2. # Compute the installation prefix relative to this file.
  3. # 三次调用 get_filename_component 计算 OpenBLAS安装路径
  4. # _IMPORT_PREFIX为OpenBLAS安装路径
  5. get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_DIR}" PATH)
  6. get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
  7. get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
  8. if(_IMPORT_PREFIX STREQUAL "/")
  9. set(_IMPORT_PREFIX "")
  10. endif()
  11. SET(OpenBLAS_INCLUDE_DIRS ${_IMPORT_PREFIX}/include)
  12. # 判断编译器类型,MSVC下置为import library(.dll.a),否则(MinGW)置为.dll
  13. if(MSVC)
  14. SET(OpenBLAS_LIBRARIES ${_IMPORT_PREFIX}/lib/libopenblas.dll.a)
  15. else(MSVC)
  16. SET(OpenBLAS_LIBRARIES ${_IMPORT_PREFIX}/bin/libopenblas.dll)
  17. endif(MSVC)
  18. SET(openblas_is_dynamic true)
  19. # if OpenBlas_USE_STATIC is true,force to use static library with MinGW
  20. if(openblas_is_dynamic)
  21. # 使用MinGW编译时,如果定义了OpenBlas_USE_STATIC,则置为静态库
  22. if(EXISTS "${_IMPORT_PREFIX}/lib/libopenblas.a" AND OpenBlas_USE_STATIC AND NOT MSVC)
  23. SET(OpenBLAS_LIBRARIES ${_IMPORT_PREFIX}/lib/libopenblas.a)
  24. endif()
  25. endif(openblas_is_dynamic)
  26. unset(openblas_is_dynamic)
  27. unset(_IMPORT_PREFIX)

完整代码

修改后的OpenBLAS Makefile.install完整代码参见 :

@H_404_58@

https://code.csdn.net/10km/caffe-static/tree/master/patch/OpenBLAS-0.2.18/Makefile.install

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