How to solve 'undefined reference to llvm::createLowerSwitchPass()' when compiling Obfuscator?

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本文详细介绍了在使用LLVM 9.0编译Obfuscator时遇到的“undefined reference to llvm::createLowerSwitchPass()”错误的解决方案。通过修改多个CMakeLists.txt文件，增加Obfuscation和TransformUtils组件，成功解决了链接问题。

How to solve ‘undefined reference to llvm::createLowerSwitchPass()’ when compiling Obfuscator(llvm-9.0) ?

How to solve the problem that an error occurs in Obfuscator(llvm-9.0) compilation, as follow figure:
obfuscator compiling error
As error information showing, ‘undefined reference to llvm::createLowerSwitchPass()’. Cause of the problem is lack of llvm link-components configured.

The way to solve the problem is:

1.modify ‘obfuscator/tools/lto/CMakeLists.txt’:

1 set(LLVM_LINK_COMPONENTS                         
2 +++  Obfuscation # --[FIX err]
3 +++  TransformUtils # --[FIX err]
4   AllTargetsAsmParsers
5   AllTargetsCodeGens

2.modify ‘obfuscator/tools/llvm-lto/CMakeLists.txt’

1 set(LLVM_LINK_COMPONENTS                         
2 +++  Obfuscation # --[FIX err]
3 +++  TransformUtils # --[FIX err]
4   AllTargetsAsmParsers
5   AllTargetsCodeGens

3.modify ‘obfuscator/tools/llvm-lto2/CMakeLists.txt’

1 set(LLVM_LINK_COMPONENTS                         
2 +++  Obfuscation # --[FIX err]
3 +++  TransformUtils # --[FIX err]
4   AllTargetsAsmParsers
5   AllTargetsCodeGens

4.modify ‘obfuscator/unittests/IR/CMakeLists.txt’

1 set(LLVM_LINK_COMPONENTS                                           
2 +++  Obfuscation # --[FIX err]
3 +++  TransformUtils # --[FIX err]
4   Analysis
5   AsmParser

5.modify ‘obfuscator/unittests/Passes/CMakeLists.txt’

10 set(LLVM_LINK_COMPONENTS                                           
11 +++     Obfuscation # --[FIX err]
12 +++     TransformUtils # --[FIX err]
13         Support                                                   
14         Passes                                                     
15         Core)

6.Finally, create obfuscator cmake project, and make.

Note:

The way above is too complex. I think that there is a better way to solve this problem, maybe modifying other cmake-config to compile the function definition(llvm::createLowerSwitchPass) into other archive, or others. At the moment, I have not idea.

If your way is better than mine, please tell me. Thanks.

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