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Created Troubleshooting Build Issues (markdown)

Andrew Kelley 2017-04-24 17:00:40 -04:00
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Troubleshooting-Build-Issues.md Normal file

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### Troubleshooting
If you get one of these:
```
undefined reference to `_ZNK4llvm17SubtargetFeatures9getStringB5cxx11Ev'
undefined reference to `llvm::SubtargetFeatures::getString() const'
```
This is because of
[C++'s Dual ABI](https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html).
Most likely LLVM was compiled with one compiler while Zig was compiled with a
different one, for example GCC vs clang.
To fix this, you have 2 options:
* Compile Zig with the same compiler that LLVM was compiled with.
* Add `-DZIG_LLVM_OLD_CXX_ABI=yes` to the cmake configure line.