链接器错误编译使用Boost.Thread使用Boost.Thread链接到静态库的可执行文件

Question

我有一个名为MyAwesomeLib的静态库。它是建立与下面的CMakeLists.txt

PROJECT(MyAwesomeLib) 

find_package(OpenCV) 
find_package(VTK REQUIRED) 
find_package(OpenGL) 
find_package(GLUT) 

set(Boost_USE_STATIC_LIBS ON) 
set(Boost_USE_MULTITHREADED ON) 
set(Boost_USE_STATIC_RUNTIME OFF) 
FIND_PACKAGE(Boost COMPONENTS thread) 

if(NOT Boost_FOUND) 
message(SEND_ERROR "Cannot find Boost Thread") 
endif(NOT Boost_FOUND) 

link_directories (${Boost_LIBRARY_DIRS}) 
include_directories(${Boost_INCLUDE_DIR} ${GLUT_INCLUDE_DIR}) 

INCLUDE(${VTK_USE_FILE}) 

file(GLOB SRCS "*.cpp" "*.c") 
file(GLOB HDRS "*.h") 
add_library(MyAwesomeLib STATIC ${SRCS} ${HDRS}) 
target_link_libraries(MyAwesomeLib ${OpenCV_LIBS} ${Boost_LIBRARIES} ${GLUT_LIBRARY} ${OPENGL_LIBRARY}) 

现在我想建立MyAwesomeExecutable从MyAwesomeLib需要的符号。可执行文件和库都使用Boost.Thread（线程组和线程类）。

PROJECT(MyAwesomeExecutable) 

FIND_PACKAGE(OpenCV REQUIRED) 
FIND_PACKAGE(VTK REQUIRED) 

set(Boost_USE_STATIC_LIBS ON) 
set(Boost_USE_MULTITHREADED ON) 
set(Boost_USE_STATIC_RUNTIME OFF) 
FIND_PACKAGE(Boost COMPONENTS thread) 

if(NOT Boost_FOUND) 
message(SEND_ERROR "Cannot find Boost Thread") 
endif(NOT Boost_FOUND) 

link_directories (${Boost_LIBRARY_DIRS}) 
include_directories(${Boost_INCLUDE_DIR} ${GLUT_INCLUDE_DIR}) 

INCLUDE(${VTK_USE_FILE}) 

FILE(GLOB SRCS "*.cpp" "*.c") 
FILE(GLOB HDRS "*.h") 

ADD_EXECUTABLE(MyAwesomeExecutable ${SRCS} ${HDRS}) 
TARGET_LINK_LIBRARIES(MyAwesomeExecutable MyAwesomeLib ${Boost_LIBRARIES} ${GLUT_LIBRARY} ${OPENGL_LIBRARY} ${OpenCV_LIBS}) 

当我建立MyAwesomeExecutable，Visual Studio 2010中建立的依赖MyAwesomeLib自动。 MyAwesomeLib建立得很好。但是，建设MyAwesomeExecutable给出以下链接错误：

2>MyAwesomeExecutable.obj : error LNK2019: unresolved external symbol "public: void __cdecl boost::thread::join(void)" ([email protected]@[email protected]@QEAAXXZ) referenced in function "public: void __cdecl boost::thread_group::join_all(void)" ([email protected][email protected]@@QEAAXXZ) 
2>MyAwesomeLib.lib(Face.obj) : error LNK2001: unresolved external symbol "public: void __cdecl boost::thread::join(void)" ([email protected]@[email protected]@QEAAXXZ) 
2>MyAwesomeExecutable.obj : error LNK2019: unresolved external symbol "public: __cdecl boost::thread::~thread(void)" ([email protected]@@[email protected]) referenced in function "public: void * __cdecl boost::thread::`scalar deleting destructor'(unsigned int)" ([email protected]@@[email protected]) 
2>MyAwesomeLib.lib(Face.obj) : error LNK2001: unresolved external symbol "public: __cdecl boost::thread::~thread(void)" ([email protected]@@[email protected]) 
2>MyAwesomeExecutable.obj : error LNK2019: unresolved external symbol "private: void __cdecl boost::thread::start_thread(void)" ([email protected]@[email protected]@AEAAXXZ) referenced in function "public: __cdecl boost::thread::thread<class boost::_bi::bind_t<void,void (__cdecl*)(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >),class boost::_bi::list1<class boost::_bi::value<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > > > >(class boost::_bi::bind_t<void,void (__cdecl*)(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >),class boost::_bi::list1<class boost::_bi::value<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > > >,struct boost::thread::dummy *)" ([email protected][email protected][email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected][email protected][email protected][email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@@@[email protected]@@@[email protected]@@@[email protected]@@[email protected][email protected][email protected][email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected][email protected][email protected][email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@@@[email protected]@@@[email protected]@[email protected]@@Z) 
2>MyAwesomeLib.lib(Face.obj) : error LNK2001: unresolved external symbol "private: void __cdecl boost::thread::start_thread(void)" ([email protected]@[email protected]@AEAAXXZ) 

Answer 1

静态库只是一个目标文件的集合。它可以很好地编译，因为它不使用未定义的符号。可以进行多项检查以确保增强库与您的库真正连接。请做，提供一些更多的信息。

1.使用cmake输出Boost_LIBRARY_DIRS和Boost_INCLUDE_DIRS的值来检查链接的增强库。

2.查看cmake生成的link.txt文件。这个文件是为像库或可执行文件这样的每个目标生成的，并且在Linux上被放置在buildir/path/to/target/folder/CMakeFiles/targetName.dir/link.txt之下。 link.txt包含编译命令来构建和链接可执行文件。有了它，你可以检查，增强线程库是否实际链接到您的可执行文件。在VSlink.txt没有生成，正如在这个答案的评论中所说。然后你可以检查使用VS本身的链接器命令行。