CODEWITHSUNDEEP
c++llvmsymbolsclang++emscripten
Missing User
Missing User

Reputation: 113

Emscripten Multiply defined symbol, vtable

I have compiled a variety of LLVM Object files.

However, when linking them together, I get this error:

error: Linking globals named '_ZTV4CRpg': symbol multiply defined!

I debugged and found there was a conflict between two objects: rpg.o and weapons.o. They both had the _ZTV4CRpg symbol in them. This translates to a vtable for CRpg. And that would make sense, as they both define CRpg. However, the definitions of CRpg are totally different. Why would this happen and is there a fix?

Here are the two C++ source files: weapons.cpp, rpg.cpp

I found a bug in LLVM regarding this issue but I cannot apply the latest version as the program I am trying to compile is 7 years old, the patch is 1 year old, and I need to avoid compatibility issues as much as possible.

Using modern compilers, however, it is shown that the symbols are NOT the same:

$ nm build/dlls/CMakeFiles/server.dir/rpg.cpp.o | grep _ZTV4CRpg 
                  U _ZTV4CRpg 
$ nm build/dlls/CMakeFiles/server.dir/weapons.cpp.o | grep _ZTV4CRpg
 0000000000000000 V _ZTV4CRpg

However on the LLVM build they are both 0000000000000000 V _ZTV4CRpg

Note I used nm and grep to scan for conflicting symbols.

Upvotes: 0

Views: 70

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