Function GetDistribValue

Source/cmCMakeHostSystemInformationCommand.cxx:443–477

}

cm::optional<std::string> GetDistribValue(cmExecutionStatus& status,
                                          std::string const& key,
                                          std::string const& variable)
{
  auto const prefix = "DISTRIB_"_s;
  if (!cmHasPrefix(key, prefix)) {
    return {};
  }

  static std::map<std::string, std::string> const s_os_release =
    GetOSReleaseVariables(status);

  auto& makefile = status.GetMakefile();

  std::string const subkey =
    key.substr(prefix.size(), key.size() - prefix.size());
  if (subkey == "INFO"_s) {
    std::string vars;
    for (auto const& kv : s_os_release) {
      auto cmake_var_name = cmStrCat(variable, '_', kv.first);
      vars += DELIM[!vars.empty()] + cmake_var_name;
      makefile.AddDefinition(cmake_var_name, kv.second);
    }
    return cm::optional<std::string>(std::move(vars));
  }

  // Query individual variable
  auto const it = s_os_release.find(subkey);
  if (it != s_os_release.cend()) {
    return it->second;
  }

  // NOTE Empty string means requested variable not set
  return std::string{};
}

#ifdef _WIN32
std::string FindMSYSTEM_PREFIX(std::vector<std::string> prefixes)