Method EvaluateDirectoryEntries

Source/cmFileSet.cxx:160–217

}

std::vector<std::string> cmFileSet::EvaluateDirectoryEntries(
  std::vector<std::unique_ptr<cmCompiledGeneratorExpression>> const& cges,
  cm::GenEx::Context const& context, cmGeneratorTarget const* target,
  cmGeneratorExpressionDAGChecker* dagChecker) const
{
  struct DirCacheEntry
  {
    std::string collapsedDir;
    cm::optional<cmSystemTools::FileId> fileId;
  };

  std::unordered_map<std::string, DirCacheEntry> dirCache;
  std::vector<std::string> result;
  for (auto const& cge : cges) {
    auto entry = cge->Evaluate(context, dagChecker, target);
    cmList dirs{ entry };
    for (std::string dir : dirs) {
      if (!cmSystemTools::FileIsFullPath(dir)) {
        dir = cmStrCat(context.LG->GetCurrentSourceDirectory(), '/', dir);
      }

      auto dirCacheResult = dirCache.emplace(dir, DirCacheEntry());
      auto& dirCacheEntry = dirCacheResult.first->second;
      auto const isNewCacheEntry = dirCacheResult.second;

      if (isNewCacheEntry) {
        cmSystemTools::FileId fileId;
        auto isFileIdValid = cmSystemTools::GetFileId(dir, fileId);
        dirCacheEntry.collapsedDir = cmSystemTools::CollapseFullPath(dir);
        dirCacheEntry.fileId =
          isFileIdValid ? cm::optional<decltype(fileId)>(fileId) : cm::nullopt;
      }

      for (auto const& priorDir : result) {
        auto priorDirCacheEntry = dirCache.at(priorDir);
        bool sameFile = dirCacheEntry.fileId.has_value() &&
          priorDirCacheEntry.fileId.has_value() &&
          (*dirCacheEntry.fileId == *priorDirCacheEntry.fileId);
        if (!sameFile &&
            (cmSystemTools::IsSubDirectory(dirCacheEntry.collapsedDir,
                                           priorDirCacheEntry.collapsedDir) ||
             cmSystemTools::IsSubDirectory(priorDirCacheEntry.collapsedDir,
                                           dirCacheEntry.collapsedDir))) {
          context.LG->GetCMakeInstance()->IssueMessage(
            MessageType::FATAL_ERROR,
            cmStrCat(
              "Base directories in file set cannot be subdirectories of each "
              "other:\n  ",
              priorDir, "\n  ", dir),
            cge->GetBacktrace());
          return {};
        }
      }
      result.push_back(dir);
    }
  }
  return result;
}