Method ReadPackage

Source/cmFindPackageCommand.cxx:2106–2188

}

bool cmFindPackageCommand::ReadPackage()
{
  // Resolve any transitive dependencies for the root file.
  if (!FindPackageDependencies(this->FileFound, *this->CpsReader,
                               this->Required)) {
    return false;
  }

  bool const hasComponentsRequested =
    !this->RequiredComponents.empty() || !this->OptionalComponents.empty();

  cmMakefile::CallRAII cs{ this->Makefile, this->FileFound, this->Status };
  cmMakefile::PolicyPushPop ps{ this->Makefile };

  this->Makefile->SetPolicy(cmPolicies::CMP0200, cmPolicies::NEW);

  // Loop over appendices.
  auto iter = this->CpsAppendices.begin();
  while (iter != this->CpsAppendices.end()) {
    RequiredStatus required = RequiredStatus::Optional;
    bool important = false;

    // Check if this appendix provides any requested components.
    if (hasComponentsRequested) {
      auto providesAny = [&iter](
                           std::set<std::string> const& desiredComponents) {
        return std::any_of(iter->second.Components.begin(),
                           iter->second.Components.end(),
                           [&desiredComponents](std::string const& component) {
                             return cm::contains(desiredComponents, component);
                           });
      };

      if (providesAny(this->RequiredComponents)) {
        important = true;
        required = this->Required;
      } else if (!providesAny(this->OptionalComponents)) {
        // This appendix doesn't provide any requested components; remove it
        // from the set to be imported.
        iter = this->CpsAppendices.erase(iter);
        continue;
      }
    }

    // Resolve any transitive dependencies for the appendix.
    if (!this->FindPackageDependencies(iter->first, iter->second, required)) {
      if (important) {
        // Some dependencies are missing, and we need(ed) this appendix; fail.
        return false;
      }

      // Some dependencies are missing, but we don't need this appendix; remove
      // it from the set to be imported.
      iter = this->CpsAppendices.erase(iter);
    } else {
      ++iter;
    }
  }