Method ComputeLinkClosure

Source/cmGeneratorTarget_Link.cxx:194–241

};

bool cmGeneratorTarget::ComputeLinkClosure(std::string const& config,
                                           LinkClosure& lc,
                                           bool secondPass) const
{
  // Get languages built in this target.
  std::unordered_set<std::string> languages;
  cmLinkImplementation const* impl =
    this->GetLinkImplementation(config, UseTo::Link, secondPass);
  assert(impl);
  languages.insert(impl->Languages.cbegin(), impl->Languages.cend());

  // Add interface languages from linked targets.
  // cmTargetCollectLinkLanguages linkLangs(this, config, languages, this,
  // secondPass);
  cmTargetCollectLinkLanguages linkLangs(this, config, languages, this,
                                         secondPass);
  for (cmLinkItem const& lib : impl->Libraries) {
    linkLangs.Visit(lib);
  }

  // Store the transitive closure of languages.
  cm::append(lc.Languages, languages);

  // Choose the language whose linker should be used.
  if (secondPass || lc.LinkerLanguage.empty()) {
    // Find the language with the highest preference value.
    cmTargetSelectLinker tsl(this);

    // First select from the languages compiled directly in this target.
    for (std::string const& l : impl->Languages) {
      tsl.Consider(l);
    }

    // Now consider languages that propagate from linked targets.
    for (std::string const& lang : languages) {
      std::string propagates =
        cmStrCat("CMAKE_", lang, "_LINKER_PREFERENCE_PROPAGATES");
      if (this->Makefile->IsOn(propagates)) {
        tsl.Consider(lang);
      }
    }

    lc.LinkerLanguage = tsl.Choose();
  }

  return impl->HadLinkLanguageSensitiveCondition ||
    linkLangs.GetHadLinkLanguageSensitiveCondition();
}

void cmGeneratorTarget::ComputeLinkClosure(std::string const& config,
                                           LinkClosure& lc) const