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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.
+