Question

我使用cmake进行带有提升的项目，我已经根据需要设置了boost信号，并且cmake说明了它找到了它，但是当我编译项目时，我收到链接错误。

我可以使用链接器指令集（CMAKE_EXE_LINKER_FLAGS -lboost_signals）来解决它这似乎与它应该做的相反。有人可以提出更好的方法吗？感谢

在CMakeLists.txt

中

   IF(UNIX)
        find_package(Boost COMPONENTS system filesystem random regex signals thread program_options date_time REQUIRED)

            INCLUDE_DIRECTORIES( ${Boost_INCLUDE_DIRS} ) 

    ENDIF()

运行cmake：

   $ cmake ../
    -- Boost version: 1.49.0
    -- Found the following Boost libraries:
    --   system
    --   filesystem
    --   random
    --   regex
    --   signals
    --   thread
    --   program_options
    --   date_time
    -- Configuring done
    -- Generating done
    -- Build files have been written to: /home/me/myproject/build

链接错误：

/usr/bin/ld: /usr/local/lib/libwt.so: undefined reference to symbol '_ZN5boost7signals9trackableD2Ev'
/usr/bin/ld: note: '_ZN5boost7signals9trackableD2Ev' is defined in DSO /usr/lib/libboost_signals.so.1.49.0 so try adding it to the linker command line
/usr/lib/libboost_signals.so.1.49.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status

Answer 1

Boost Signals不是仅限标头的库。除了给出include目录之外，你还需要告诉CMake链接它。

add_executable(MyProgram [...] )
target_link_libraries(MyProgram ${Boost_LIBRARIES})

如果您计划在Windows上构建，您可能还想禁用自动链接：

add_definitions(-DBOOST_ALL_NO_LIB)

请注意，Boost Signals已被弃用，并由Signals2取代，consider using Signals2 instead实际上是一个仅限标头的库。如果由您决定，{{3}}。

cmake和boost信号的问题

1 个答案: