CMake downloads (or reuses) build-time tarballs and archives here. The directory ships with the source tree so you can stage dependencies on a networked machine, copy the whole IoTDB checkout to an offline host, and build client-cpp with -DIOTDB_OFFLINE=ON.

Tarballs themselves are not committed to Git (see per-platform .gitignore files). Only this README and the empty platform folders are tracked. Each linux/, mac/, and windows/ sub-folder ships a minimal .gitignore (* with !.gitignore) so Git keeps the directory in the tree while ignoring downloaded archives.

third-party/
├── linux/     # tarballs for Linux offline builds
├── mac/       # tarballs for macOS offline builds
└── windows/   # tarballs / zips for Windows offline builds

Override the root with -DIOTDB_DEPS_DIR=<path> (Maven: -Diotdb.deps.dir=...). The platform sub-folder (linux/, mac/, windows/) is selected automatically.

Run a normal online configure once; CMake caches everything under the matching <os>/ folder:

cmake -S iotdb-client/client-cpp -B build
# or: mvn -P with-cpp -pl iotdb-client/client-cpp -am -DskipTests package

Alternatively copy files manually from the URLs listed in README.md (Offline build section).

1. Copy the entire IoTDB repository (including iotdb-client/client-cpp/third-party/<os>/).

2. Configure with offline mode:

   cmake -S iotdb-client/client-cpp -B build -DIOTDB_OFFLINE=ON
   cmake --build build --config Release --target install

Download URLs: see the Offline build table in README.md.