c++ - LLVM:VS 2015中的链接错误

Question

我已经下载了源代码，并使用CMake和VS 2015构建了LLVM。

我的示例程序如下:

#include <iostream>

#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/CFG.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;

int main(int argc, char **argv) {
    if (argc < 2) {
        errs() << "Usage: " << argv[0] << " <IR file>\n";
        return 1;
    }

    // Parse the input LLVM IR file into a module.
    SMDiagnostic Err;
    LLVMContext TheContext;
    std::unique_ptr<Module> Mod = parseIRFile(argv[1], Err, TheContext);
    if (!Mod) {
        Err.print(argv[0], errs());
        return 1;
    }

    // ... use module
}

在链接器库路径中包含LLVM lib目录后，出现以下链接错误:

Severity    Code    Description Project File    Line    Suppression State
Error   LNK2019 unresolved external symbol "public: __thiscall llvm::LLVMContext::LLVMContext(void)" (??0LLVMContext@llvm@@QAE@XZ) referenced in function _main LLVM_IRReader   c:\Users\nlykkei\documents\visual studio 2015\Projects\LLVM_IRReader\LLVM_IRReader\Main.obj 1   

Severity    Code    Description Project File    Line    Suppression State
Error   LNK2019 unresolved external symbol "public: __thiscall llvm::Module::~Module(void)" (??1Module@llvm@@QAE@XZ) referenced in function "public: void * __thiscall llvm::Module::`scalar deleting destructor'(unsigned int)" (??_GModule@llvm@@QAEPAXI@Z)   LLVM_IRReader   c:\Users\nlykkei\documents\visual studio 2015\Projects\LLVM_IRReader\LLVM_IRReader\Main.obj 1   

Severity    Code    Description Project File    Line    Suppression State
Error   LNK2019 unresolved external symbol "class llvm::raw_ostream & __cdecl llvm::errs(void)" (?errs@llvm@@YAAAVraw_ostream@1@XZ) referenced in function _main    LLVM_IRReader   c:\Users\nlykkei\documents\visual studio 2015\Projects\LLVM_IRReader\LLVM_IRReader\Main.obj 1   

Severity    Code    Description Project File    Line    Suppression State
Error   LNK2019 unresolved external symbol "public: void __thiscall llvm::SMDiagnostic::print(char const *,class llvm::raw_ostream &,bool,bool)const " (?print@SMDiagnostic@llvm@@QBEXPBDAAVraw_ostream@2@_N2@Z) referenced in function _main   LLVM_IRReader   c:\Users\nlykkei\documents\visual studio 2015\Projects\LLVM_IRReader\LLVM_IRReader\Main.obj 1   

有谁知道如何解决这些错误？我在LLVM构建目录中看到例如raw_ostream.obj ...

Answer 1

我从未使用过LLVM，但根据您的错误消息，链接器未成功找到LLVM类的实现。

以我的观点，仅包括LLVM lib目录是不够的。您还必须包括要链接的LLVM库(实现LLVM类的.lib)。