Method SetDirectoriesFromFile

Source/cmake.cxx:1867–1972

}

bool cmake::SetDirectoriesFromFile(std::string const& arg)
{
  // Check if the argument refers to a CMakeCache.txt or CMakeLists.txt file.
  // Do not check for the custom project filename CMAKE_LIST_FILE_NAME, as it
  // cannot be determined until after reading the CMakeCache.txt
  std::string listPath;
  std::string cachePath;
  bool is_source_dir = false;
  bool is_empty_directory = false;
  if (cmSystemTools::FileIsDirectory(arg)) {
    std::string path = cmSystemTools::ToNormalizedPathOnDisk(arg);
    std::string cacheFile = cmStrCat(path, "/CMakeCache.txt");
    std::string listFile = this->GetCMakeListFile(path);

    is_empty_directory = true;
    if (cmSystemTools::FileExists(cacheFile)) {
      cachePath = path;
      is_empty_directory = false;
    }
    if (cmSystemTools::FileExists(listFile)) {
      listPath = path;
      is_empty_directory = false;
      is_source_dir = true;
    }
  } else if (cmSystemTools::FileExists(arg)) {
    std::string fullPath = cmSystemTools::ToNormalizedPathOnDisk(arg);
    std::string name = cmSystemTools::GetFilenameName(fullPath);
    name = cmSystemTools::LowerCase(name);
    if (name == "cmakecache.txt"_s) {
      cachePath = cmSystemTools::GetFilenamePath(fullPath);
    } else if (name == "cmakelists.txt"_s) {
      listPath = cmSystemTools::GetFilenamePath(fullPath);
    }
  } else {
    // Specified file or directory does not exist.  Try to set things
    // up to produce a meaningful error message.
    std::string fullPath = cmSystemTools::CollapseFullPath(arg);
    std::string name = cmSystemTools::GetFilenameName(fullPath);
    name = cmSystemTools::LowerCase(name);
    if (name == "cmakecache.txt"_s || name == "cmakelists.txt"_s) {
      listPath = cmSystemTools::GetFilenamePath(fullPath);
    } else {
      listPath = fullPath;
    }
  }

  // If there is a CMakeCache.txt file, use its settings.
  if (!cachePath.empty()) {
    if (this->LoadCache(cachePath)) {
      cmValue existingValue =
        this->State->GetCacheEntryValue("CMAKE_HOME_DIRECTORY");
      if (existingValue && !existingValue.IsEmpty()) {
        this->SetHomeOutputDirectory(cachePath);
        this->SetHomeDirectory(*existingValue);
        return true;
      }
    }
  }