Question

我在Eclipse C ++中使用Windows。我的项目中有这个结构：

subProject A
   -> creates a static library (works fine)
subProject B encapsulating subproject A
   -> creates a static library (works fine)
subProject TestA
   -> creates an executable (works fine)
subProject TestB
    |dev
      |src
      | CmakeList.txt
    |CmakeList.txt
   -> creates an executable (doesn't work)

这是TestB可执行文件的dev目录中的 CmakeList.txt ：

set(${PROJECT_NAME}_INCLUDE_DIRS
    $(CMAKE_CURRENT_SOURCE_DIR}/src
    CACHE STRING "" FORCE)

include_directories(${${PROJECT_NAME}_INCLUDE_DIRS})

file(GLOB_RECURSE ${PROJECT_NAME}_HEADER_FILES FOLLOW_SYMLINKS
  ./*.hpp
  ./*.h)

file(GLOB_RECURSE ${PROJECT_NAME}_SORUCE_FILES FOLLOW_SYMLINKS
  ./*.cpp
  ./*.c)

set(${PROJECT_NAME}_FILES ${${PROJECT_NAME}_HEADER_FILES}
    ${${PROJECT_NAME}_SOURCE_FILES})

# Additional includes and link directories and dependencies
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../../install/${CMAKE_BUILD_TYPE}/A/include)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../../install/${CMAKE_BUILD_TYPE}/B/include)

if(${CMAKE_BUILD_TYPE} STREQUAL "Release")
set(${PROJECT_NAME}_EXTRA_LIBRARIES ${${PROJECT_NAME}_EXTRA_LIBRARIES}
                     A
                     B
                     pthread)
elseif(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
set(${PROJECT_NAME}_EXTRA_LIBRARIES ${${PROJECT_NAME}_EXTRA_LIBRARIES}
                     A
                     B
                     pthread)
endif()

# Add a library to the project
link_directories(${CMAKE_CURRENT_SOURCE_DIR}/../../install/${CMAKE_BUILD_TYPE}/A/lib)
link_directories(${CMAKE_CURRENT_SOURCE_DIR}/../../install/${CMAKE_BUILD_TYPE}/B/lib)

add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_FILES})

target_link_libraries(${PROJECT_NAME} ${${PROJECT_NAME}_EXTRA_LIBRARIES})

install(FILES ${${PROJECT_NAME}_HEADER_FILES}
     DESTINATION ${CMAKE_INSTALL_PREFIX}/include/
     PERSMISSIONS OWNER_READ GROUP_READ WORLD_READ)

install(TARGETS ${PROJECT_NAME}
     ARCHIVE DESTINATION lib
     LIBRARY DESTINATION lib
     RUNTIME DESTINATION bin)

在我的B子项目中，在文件中，我有：

#include "A.hpp"

...
A algo;
A.method(parameters)

当我构建我的TestB时，我在上面2行的 B项目中出现了这个奇怪的错误，这使我的构建失败：

undefined reference to A::A()
undefined reference to A::method(parameter)

当我评论这些行并重建 B项目和 TestB项目时，它工作正常，我在B项目中有一个库，在TestB中有一个.exe

我不明白我的问题在哪里。

Answer 1

B取决于A，因此请将B的CMakeLists.txt中的依赖项添加到带有target_link_libraries的A中。即使它是一个静态库，并且在构建B时也不会有任何实际的链接，这无论如何都会提示CMake每次将B链接到可执行文件时，你也有将之后的链接到A。 A必须在链接命令行中B之后，以便在您链接到B时知道A所需的符号。有关详细信息，请参阅here。

如果您正在寻找快速修复，只需更改：

set(${PROJECT_NAME}_EXTRA_LIBRARIES ${${PROJECT_NAME}_EXTRA_LIBRARIES} A B pthread)

到这个

set(${PROJECT_NAME}_EXTRA_LIBRARIES ${${PROJECT_NAME}_EXTRA_LIBRARIES} B A pthread)

创建封装2个其他项目的可执行文件

1 个答案: