C++ cmake 的“未定义引用”
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'undefined reference to' with cmake
提问by hal7df
So, I am trying to write an applet for school, and part of it requires using cmake. I have two different classes contained in their own files, and I use them as part of the main class. I have included their headers as such in the main project header:
所以，我正在尝试为学校编写一个小程序，其中一部分需要使用 cmake。我有两个不同的类包含在它们自己的文件中，我将它们用作主类的一部分。我已经在主项目标题中包含了它们的标题：
#include /path/to/header/1.h
#include /path/to/header/2.h
The problem I have is that when I run make after I've run cmake, I get undefined reference errors for any instance in which I try to use one of the two libraries. I know that it has to do with linker errors, but since I'm new to cmake, I'm not exactly sure what the proper way to use TARGET_LINK_LIBRARIES would be.
我遇到的问题是，当我在运行 cmake 之后运行 make 时，对于我尝试使用两个库之一的任何实例，我都会收到未定义的引用错误。我知道这与链接器错误有关，但由于我是 cmake 的新手，我不确定使用 TARGET_LINK_LIBRARIES 的正确方法是什么。
EDIT
编辑
After linking/associating my libraries, I have the following:
链接/关联我的库后，我有以下内容：
CMakeLists.txt:
CMakeLists.txt：
# A name for the project
project(plasma-engine-gdrive)
# Find the required libaries
find_package(KDE4 REQUIRED)
include(KDE4Defaults)
add_definitions (${QT_DEFINITIONS} ${KDE4_DEFINITIONS}, -std=c++0x)
include_directories(
${CMAKE_SOURCE_DIR}
${CMAKE_BINARY_DIR}
${KDE4_INCLUDES}
./include
./lib
)
set (GOOGLE_LIBS include/atom_helper.h include/util/string_utils.h include/client/doc_list_service.h include/client/service.h)
set (GOOGLE_SRCS include/atom_helper.cc include/util/string_utils.cc include/client/doc_list_service.cc include/client/service.cc)
# We add our source code here
set(gdrive_engine_SRCS gdriveengine.cpp)
add_library (DataWrapper include/DataWrapper.cpp include/DataWrapper.h)
add_library (GData ${GOOGLE_SRCS} ${GOOGLE_LIBS})
# Now make sure all files get to the right place
kde4_add_plugin(plasma_engine_gdrive ${gdrive_engine_SRCS})
target_link_libraries(plasma_engine_gdrive
GData
DataWrapper
${KDE4_KDECORE_LIBS}
${KDE4_PLASMA_LIBS})
install(TARGETS plasma_engine_gdrive
DESTINATION ${PLUGIN_INSTALL_DIR})
install(FILES plasma-engine-gdrive.desktop
DESTINATION ${SERVICES_INSTALL_DIR})
There are also too many errors to put here. Here's a few:
也有太多错误不能放在这里。这里有一些：
/usr/include/c++/4.6/bits/stl_map.h:467: undefined reference to `Glib::ustring::ustring()'
lib/libGData.a(atom_helper.o): In function `pair<Glib::ustring, Glib::ustring, void>':
/usr/include/c++/4.6/bits/stl_pair.h:132: undefined reference to `Glib::ustring::ustring(Glib::ustring const&)'
/usr/include/c++/4.6/bits/stl_pair.h:132: undefined reference to `Glib::ustring::ustring(Glib::ustring const&)'
lib/libGData.a(atom_helper.o): In function `pair<Glib::ustring, Glib::ustring>':
/usr/include/c++/4.6/bits/stl_pair.h:137: undefined reference to `Glib::ustring::ustring(Glib::ustring const&)'
/usr/include/c++/4.6/bits/stl_pair.h:137: undefined reference to `Glib::ustring::ustring(Glib::ustring const&)'
回答by hal7df
I was working with some others and I got it compiled!
我和其他人一起工作，我把它编译了！
All I really needed was to provide the name of the library and put it into target_link_librarieslike so:
我真正需要的只是提供库的名称并将其放入target_link_libraries如下所示：
target_link_libraries(plasma_engine_gdrive
DataWrapper
GData
xml++-2.6
curl
glibmm-2.4
${KDE4_KDECORE_LIBS}
${KDE4_PLASMA_LIBS})
My dad, being completely unfamiliar with CMake, went and dug out the link.txtwithin the CMake build structure. There, he just added the following after the -oflag:
我父亲对 CMake 完全不熟悉，他去挖掘了link.txtCMake 构建结构。在那里，他只是在-o标志后添加了以下内容：
-lxml++-2.6
-lcurl
-lglibmm-2.4
When I saw that, I thought I might try to do that linking through CMakeLists.txt -- and it worked.
当我看到它时，我想我可能会尝试通过 CMakeLists.txt 进行链接——并且它奏效了。
