从其它平台迁移而来
在使用Lazarus编写动态库的过程中遇到了报Error: Undefined symbol:错误的问题，死活编译不过去，加了LCL包依赖也不行，找了N久终于在一个英文网站上找到了解决办法。
Error: Undefined symbol:错误会依据所写的代码用到的单元不同而有一定的差异，我遇到的报错大致如下：
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project1.lpr(18,1) Error: Undefined symbol: WSRegisterCustomImageListResolution
project1.lpr(18,1) Error: Undefined symbol: WSRegisterMenuItem
project1.lpr(18,1) Error: Undefined symbol: WSRegisterMenu
project1.lpr(18,1) Error: Undefined symbol: WSRegisterMainMenu
project1.lpr(18,1) Error: Undefined symbol: WSRegisterPopupMenu
project1.lpr(18,1) Error: Undefined symbol: WSRegisterDragImageListResolution
project1.lpr(18,1) Error: Undefined symbol: WSRegisterLazAccessibleObject
project1.lpr(18,1) Error: Undefined symbol: WSRegisterControl
project1.lpr(18,1) Error: Undefined symbol: WSRegisterWinControl
project1.lpr(18,1) Error: Undefined symbol: WSRegisterGraphicControl
project1.lpr(18,1) Error: Undefined symbol: WSRegisterCustomControl
project1.lpr(18,1) Error: Undefined symbol: WSRegisterScrollingWinControl
project1.lpr(18,1) Error: Undefined symbol: WSRegisterScrollBox
project1.lpr(18,1) Error: Undefined symbol: WSRegisterCustomFrame
project1.lpr(18,1) Error: Undefined symbol: WSRegisterCustomForm
project1.lpr(18,1) Error: Undefined symbol: WSRegisterHintWindow
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其实之前已经离解决问题很近了，只需再uses一个Interfaces，即：
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在Project Inspector的Required Packages里添加LCL包
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在工程单元的uses列表里添加Interfaces单元