Method Evaluate

Source/cmGeneratorExpressionNode.cxx:3183–3228

  int NumExpectedParameters() const override { return TwoOrMoreParameters; }

  std::string Evaluate(
    std::vector<std::string> const& parameters, cm::GenEx::Evaluation* eval,
    GeneratorExpressionContent const* content,
    cmGeneratorExpressionDAGChecker* dagChecker) const override
  {
    if (!eval->HeadTarget || !dagChecker ||
        !(dagChecker->EvaluatingLinkExpression() ||
          dagChecker->EvaluatingLinkLibraries() ||
          dagChecker->EvaluatingLinkerLauncher())) {
      reportError(
        eval, content->GetOriginalExpression(),
        "$<LINK_LANG_AND_ID:lang,id> may only be used with binary targets "
        "to specify link libraries, link directories, link options, and "
        "link "
        "depends.");
      return std::string();
    }

    cmGlobalGenerator const* gg = eval->Context.LG->GetGlobalGenerator();
    std::string genName = gg->GetName();
    if (genName.find("Makefiles") == std::string::npos &&
        genName.find("Ninja") == std::string::npos &&
        genName.find("FASTBuild") == std::string::npos &&
        genName.find("Visual Studio") == std::string::npos &&
        genName.find("Xcode") == std::string::npos &&
        genName.find("Watcom WMake") == std::string::npos &&
        genName.find("Green Hills MULTI") == std::string::npos) {
      reportError(
        eval, content->GetOriginalExpression(),
        "$<LINK_LANG_AND_ID:lang,id> not supported for this generator.");
      return std::string();
    }

    if (dagChecker->EvaluatingLinkLibraries()) {
      eval->HadHeadSensitiveCondition = true;
      eval->HadLinkLanguageSensitiveCondition = true;
    }

    std::string const& lang = eval->Context.Language;
    if (lang == parameters.front()) {
      std::vector<std::string> idParameter((parameters.cbegin() + 1),
                                           parameters.cend());
      return LinkerId::Evaluate(idParameter, eval, content, lang);
    }
    return "0";
  }
} linkLanguageAndIdNode;

struct CompilerLinkerIdNode : public cmGeneratorExpressionNode