Method FindPackage

Source/cmFindPackageCommand.cxx:1082–1349

}

bool cmFindPackageCommand::FindPackage(
  std::vector<std::string> const& argsForProvider)
{
  std::string const makePackageRequiredVar =
    cmStrCat("CMAKE_REQUIRE_FIND_PACKAGE_", this->Name);
  bool const makePackageRequiredSet =
    this->Makefile->IsOn(makePackageRequiredVar);
  if (makePackageRequiredSet) {
    if (this->IsRequired()) {
      this->Makefile->IssueMessage(
        MessageType::WARNING,
        cmStrCat("for module ", this->Name,
                 " already called with REQUIRED, thus ",
                 makePackageRequiredVar, " has no effect."));
    } else {
      this->Required = RequiredStatus::RequiredFromPackageVar;
    }
  }

  std::string const disableFindPackageVar =
    cmStrCat("CMAKE_DISABLE_FIND_PACKAGE_", this->Name);
  if (this->Makefile->IsOn(disableFindPackageVar)) {
    if (this->IsRequired()) {
      this->SetError(
        cmStrCat("for module ", this->Name,
                 (makePackageRequiredSet
                    ? " was made REQUIRED with " + makePackageRequiredVar
                    : " called with REQUIRED, "),
                 " but ", disableFindPackageVar,
                 " is enabled. A REQUIRED package cannot be disabled."));
      return false;
    }
    return true;
  }

  // Restore PACKAGE_PREFIX_DIR to its pre-call value when we return. If our
  // caller is a file generated by configure_package_config_file(), and if
  // the package we are about to load also has a config file created by that
  // command, it will overwrite PACKAGE_PREFIX_DIR. We need to restore it in
  // case something still refers to it in our caller's scope after we return.
  class RestoreVariableOnLeavingScope
  {
    cmMakefile* makefile_;
    cm::optional<std::string> value_;

  public:
    RestoreVariableOnLeavingScope(cmMakefile* makefile)
      : makefile_(makefile)
    {
      cmValue v = makefile->GetDefinition("PACKAGE_PREFIX_DIR");
      if (v) {
        value_ = *v;
      }
    }
    ~RestoreVariableOnLeavingScope()
    {
      if (this->value_) {
        makefile_->AddDefinition("PACKAGE_PREFIX_DIR", *value_);