lld-link: Undefined symbol llvm::LLVMContext

Beginners
1

Hi, I have my project set up using Visual Studio 2022. My platform toolset is set to LLVM (clang-cl) and the include path is set correctly. My code for now looks something like this:

#include <llvm/IR/IRBuilder.h>

static llvm::LLVMContext context;
static llvm::IRBuilder<> Builder();
static std::unique_ptr<llvm::Module> _module;
static std::map<std::string, llvm::Value*> namedValues;

But when I compile I get the following three errors (I use the APInt class somewhere else as well which is why one of the errors references it):

image

Are there any additional libraries that I need to link?

2

If this is still a problem, it would be helpful to say which libraries you already include in your link. I was able to get the posted code to link cleanly (using link.exe not lld-link) with LLVMCore.lib, LLVMSupport.lib, LLVMRemarks.lib, LLVMBinaryFormat.lib, and LLVMBitstreamReader.lib.

1 Like
3

Thanks for your reply, by adding the libraries you mentioned I was able to make two of the errors go away, but I still get a "undefined symbol ‘LLVMContext’ " error (LNK2001). I have tried adding every library prefixed ‘LLVM’ to the list but this did not fix the error.

4

Please post the entire error message, and ideally the full command line that gets the error. As I said the posted example works for me, so I’m not able to reproduce your problem at this point.

5

This is the full error message as shown by Visual Studio 2022

image
image1574×70 3.79 KB

CodeGen::context refers to my LLVMContext variable which is inside my CodeGen class:

class CodeGen {
    public:
    static llvm::LLVMContext context;

Edit: It appears that removing the error wasn’t related to LLVM. One of my AST classes was statically accessing the context like this: CodeGen::context Removing this line also fixes the error.