//main.cpp
extern "C" {
    __declspec(dllimport) int __stdcall WriteConsoleW(void* hConsoleOutput, const void *lpBuffer, unsigned int nNumberOfCharsToWrite, unsigned int* lpNumberOfCharsWritten, void* lpReserved);
}

int main() {
    WriteConsoleW(nullptr, nullptr, 0, nullptr);
}

//API.cpp
    clang::CompilerInstance ci;

    clang::FileSystemOptions fso;

    clang::FileManager fm(fso);

    std::string errors;
    llvm::raw_string_ostream error_stream(errors);
    clang::DiagnosticOptions diagopts;
    clang::TextDiagnosticPrinter printer(error_stream, &diagopts);
    llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs> diagids(new clang::DiagnosticIDs);
    clang::DiagnosticsEngine engine(diagids, &diagopts, &printer, false);

    clang::SourceManager sm(engine, fm);

    clang::LangOptions langopts;
    langopts.CPlusPlus = true;
    langopts.CPlusPlus0x = true;

    clang::TargetOptions target;
    target.Triple = llvm::sys::getDefaultTargetTriple();
    auto targetinfo = clang::TargetInfo::CreateTargetInfo(engine, &target);

    auto headeropts = llvm::IntrusiveRefCntPtr<clang::HeaderSearchOptions>(new clang::HeaderSearchOptions());
    clang::HeaderSearch hs(headeropts, fm, engine, langopts, targetinfo);

    auto x = llvm::IntrusiveRefCntPtr<clang::PreprocessorOptions>(new clang::PreprocessorOptions());
    clang::Preprocessor p(x, engine, langopts, targetinfo, sm, hs, ci);

    clang::ASTContext astcon(langopts, sm, targetinfo, p.getIdentifierTable(), p.getSelectorTable(), p.getBuiltinInfo(), 1000);
    clang::ASTConsumer semacons;
    semacons.Initialize(astcon);
    clang::Sema sema(p, astcon, semacons, clang::TranslationUnitKind::TU_Complete);

    sm.createMainFileID(fm.getFile("main.cpp"));
    engine.getClient()->BeginSourceFile(langopts, &p);
    clang::ParseAST(sema);
    engine.getClient()->EndSourceFile();

    auto identinfo = p.getIdentifierInfo("WriteConsoleW");
    auto fileentry = fm.getFile("main.cpp");
    auto fileid = sm.translateFile(fileentry);
    auto sloc = sm.getLocForEndOfFile(fileid);
    clang::LookupResult lr(sema, clang::DeclarationNameInfo(identinfo, sloc), clang::Sema::LookupNameKind::LookupOrdinaryName);

    auto result = sema.LookupName(lr, sema.TUScope);
    if (!result) __debugbreak(); // Fail