我在Qt的Gui项目中，加入DCMTK编译后的MD/MDd运行时库，出现错误
1>------ Build started: Project: TestA, Configuration: Debug Win32 ------
1>Linking...
1>msvcrtd.lib(ti_inst.obj) : error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in LIBCMTD.lib(typinfo.obj)
1>msvcrtd.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in LIBCMTD.lib(typinfo.obj)
1>LIBCMTD.lib(crt0init.obj) : warning LNK4098: defaultlib 'msvcrtd.lib' conflicts with use of other libs; use /NODEFAULTLIB:library
1>D:\VSWorkSpace\TestA\Debug\TestA.exe : fatal error LNK1169: one or more multiply defined symbols found
默认库“LIBCMTD”与其他库的使用冲突；请使用 /NODEFAULTLIB:library
1>Linking...
1>msvcrtd.lib(ti_inst.obj) : error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in LIBCMTD.lib(typinfo.obj)
1>msvcrtd.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in LIBCMTD.lib(typinfo.obj)
1>LIBCMTD.lib(crt0init.obj) : warning LNK4098: defaultlib 'msvcrtd.lib' conflicts with use of other libs; use /NODEFAULTLIB:library
1>D:\VSWorkSpace\TestA\Debug\TestA.exe : fatal error LNK1169: one or more multiply defined symbols found
如何解决，网上是这样说的：
工程一大，包含的头文件和库也就多了，冲突一时是不可避免的。 不过还好， 只是Warning，并不影响整个工程的编译和运行。但是一些项目就要求尽量不出现Warning，因为你不知道将来项目的Bug会不会是由此而引起。严格，未雨绸缪，总是一件好事。谁也不想将来的某个时候去Debug N年前的玩意。 痛苦啊~~
MSDN上的解释为：
You are trying to link with incompatible libraries.
Important The run-time libraries now contain directives to prevent mixing different types. You’ll receive this warning if you try to use different types or debug and non-debug versions of the run-time library in the same program. For example, if you compiled one file to use one kind of run-time library and another file to use another kind (for example, single-threaded versus multithreaded) and tried to link them, you’ll get this warning. You should compile all source files to use the same run-time library.
总之，一句话，lib之间有冲突。需要删除导入的一些libs。
例如编译Release版本的单线程的工程，在linker的命令行加入如下的参数：
/NODEFAULTLIB:libcmt.lib /NODEFAULTLIB:msvcrt.lib /NODEFAULTLIB:libcd.lib /NODEFAULTLIB:libcmtd.lib /NODEFAULTLIB:msvcrtd.lib
当然，通过VC6.0的开发环境也可以配置。选择Project -> Setting，出现Project Setting对话框，单击Link标签，在Category下拉菜单中选择Input，在下方的Ignore libraries: 输入框中输入“被忽略的library”框中对应的libs。输入时注意当前Build是什么版本，libs之间用“，”隔开。“Ingore all default libraries”不能勾选。
参考： http://fsli.blog.hexun.com/4881338_d.html
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