Protocol Buffers 33.6

Apply these rules to protoc 33.6 with C++ 6.33.6, Python 6.33.6, or PHP 4.33.6. These language lines receive maintenance support; other artifacts bearing 33.6 do not automatically share that support. Protobuf supplies serialization, not authentication or application authorization.

Toolchain scope and supported syntax

• Pin the compiler, runtime, plugins, and schema revision together; rebuild and review generated code when adopting a maintenance patch.
• Take protoc from the protobuf GitHub releases page, checking the SHA-256 digest listed for the asset, and each runtime through its package manager with a committed lock file where the build tool has one, such as composer.lock, a Python lock file, or MODULE.bazel.lock, that an update bot keeps current. Protobuf ships fixes only on the newest minor of each supported major line, as its version-support page lists by language, so run the newest patch of this line while it's maintained. When you can't check a version, leave a placeholder that fails the build rather than one you remember; the 33.6 in this prompt's title names the release these rules were checked against, not a build to install.
• Match C++ generated code, headers, and libraries at the exact patch version; there is no C++ cross-version runtime or ABI guarantee, including between patches.
• Never pair newer generated code with an older runtime, suppress generated version checks, or load multiple major protobuf runtimes into one process. Use Python's longer compatibility window only within its documented guarantees.
• Build C++ with C++17 or newer;