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Protocol Buffers - Google's data interchange format
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===================================================
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Copyright 2008 Google Inc.
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https://developers.google.com/protocol-buffers/
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CMake Installation
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-----------------------
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To compile or install protobuf from source using CMake, see
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[cmake/README.md](../cmake/README.md).
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C++ Protobuf - Unix
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-----------------------
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To build protobuf from source, the following tools are needed:
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* bazel
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* git
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* g++
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On Ubuntu/Debian, for example, you can install them with:
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sudo apt-get install g++ git bazel
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On other platforms, please use the corresponding package managing tool to
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install them before proceeding. See https://bazel.build/install for further
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instructions on installing Bazel, or to build from source using CMake, see
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[cmake/README.md](../cmake/README.md).
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To get the source, download the release .tar.gz or .zip package in the
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release page:
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https://github.com/protocolbuffers/protobuf/releases/latest
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For example: if you only need C++, download `protobuf-cpp-[VERSION].tar.gz`; if
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you need C++ and Java, download `protobuf-java-[VERSION].tar.gz` (every package
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contains C++ source already); if you need C++ and multiple other languages,
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download `protobuf-all-[VERSION].tar.gz`.
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You can also get the source by "git clone" our git repository. Make sure you
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have also cloned the submodules and generated the configure script (skip this
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if you are using a release .tar.gz or .zip package):
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git clone https://github.com/protocolbuffers/protobuf.git
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cd protobuf
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git submodule update --init --recursive
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To build the C++ Protocol Buffer runtime and the Protocol Buffer compiler
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(protoc) execute the following:
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bazel build :protoc :protobuf
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The compiler can then be installed, for example on Linux:
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cp bazel-bin/protoc /usr/local/bin
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For more usage information on Bazel, please refer to http://bazel.build.
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**Compiling dependent packages**
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To compile a package that uses Protocol Buffers, you need to setup a Bazel
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WORKSPACE that's hooked up to the protobuf repository and loads its
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dependencies. For an example, see [WORKSPACE](../examples/WORKSPACE).
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**Note for Mac users**
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For a Mac system, Unix tools are not available by default. You will first need
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to install Xcode from the Mac AppStore and then run the following command from
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a terminal:
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sudo xcode-select --install
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To install Unix tools, you can install "port" following the instructions at
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https://www.macports.org . This will reside in /opt/local/bin/port for most
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Mac installations.
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sudo /opt/local/bin/port install bazel
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Alternative for Homebrew users:
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brew install bazel
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Then follow the Unix instructions above.
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C++ Protobuf - Windows
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--------------------------
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If you only need the protoc binary, you can download it from the release
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page:
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https://github.com/protocolbuffers/protobuf/releases/latest
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In the downloads section, download the zip file protoc-$VERSION-win32.zip.
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It contains the protoc binary as well as public proto files of protobuf
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library.
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Protobuf and its dependencies can be installed directly by using `vcpkg`:
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>vcpkg install protobuf protobuf:x64-windows
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If zlib support is desired, you'll also need to install the zlib feature:
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>vcpkg install protobuf[zlib] protobuf[zlib]:x64-windows
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See https://github.com/Microsoft/vcpkg for more information.
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To build from source using Microsoft Visual C++, see [cmake/README.md](../cmake/README.md).
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To build from source using Cygwin or MinGW, follow the Unix installation
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instructions, above.
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Binary Compatibility Warning
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----------------------------
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Due to the nature of C++, it is unlikely that any two versions of the
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Protocol Buffers C++ runtime libraries will have compatible ABIs.
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That is, if you linked an executable against an older version of
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libprotobuf, it is unlikely to work with a newer version without
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re-compiling. This problem, when it occurs, will normally be detected
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immediately on startup of your app. Still, you may want to consider
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using static linkage. You can configure this in your `cc_binary` Bazel rules
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by specifying:
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linkstatic=True
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Usage
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-----
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The complete documentation for Protocol Buffers is available via the
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web at:
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https://developers.google.com/protocol-buffers/
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