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diff --git a/protoc-artifacts/README.md b/protoc-artifacts/README.md new file mode 100644 index 00000000..1ed1435e --- /dev/null +++ b/protoc-artifacts/README.md @@ -0,0 +1,124 @@ +# Build scripts that publish pre-compiled protoc artifacts +``protoc`` is the compiler for ``.proto`` files. It generates language bindings +for the messages and/or RPC services from ``.proto`` files. + +Because ``protoc`` is a native executable, the scripts under this directory +build and publish a ``protoc`` executable (a.k.a. artifact) to Maven +repositories. The artifact can be used by build automation tools so that users +would not need to compile and install ``protoc`` for their systems. + +## Versioning +The version of the ``protoc`` artifact must be the same as the version of the +Protobuf project. + +## Artifact name +The name of a published ``protoc`` artifact is in the following format: +``protoc-<version>-<os>-<arch>.exe``, e.g., ``protoc-3.0.0-alpha-3-windows-x86_64.exe``. + +## System requirement +Install [Apache Maven](http://maven.apache.org/) if you don't have it. + +The scripts only work under Unix-like environments, e.g., Linux, MacOSX, and +Cygwin or MinGW for Windows. Please see ``README.md`` of the Protobuf project +for how to set up the build environment. + +## To install artifacts locally +The following command will install the ``protoc`` artifact to your local Maven repository. +``` +$ mvn install +``` + +## Cross-compilation +The Maven script will try to detect the OS and the architecture from Java +system properties. It's possible to build a protoc binary for an architecture +that is different from what Java has detected, as long as you have the proper +compilers installed. + +You can override the Maven properties ``os.detected.name`` and +``os.detected.arch`` to force the script to generate binaries for a specific OS +and/or architecture. Valid values are defined as the return values of +``normalizeOs()`` and ``normalizeArch()`` of ``Detector`` from +[os-maven-plugin](https://github.com/trustin/os-maven-plugin/blob/master/src/main/java/kr/motd/maven/os/Detector.java). +Frequently used values are: +- ``os.detected.name``: ``linux``, ``osx``, ``windows``. +- ``os.detected.arch``: ``x86_32``, ``x86_64`` + +For example, MingGW32 only ships with 32-bit compilers, but you can still build +32-bit protoc under 64-bit Windows, with the following command: +``` +$ mvn install -Dos.detected.arch=x86_32 +``` + +## To push artifacts to Maven Central +Before you can upload artifacts to Maven Central repository, make sure you have +read [this page](http://central.sonatype.org/pages/apache-maven.html) on how to +configure GPG and Sonatype account. + +You need to perform the deployment for every platform that you want to +suppport. DO NOT close the staging repository until you have done the +deployment for all platforms. Currently the following platforms are supported: +- Linux (x86_32 and x86_64) +- Windows (x86_32 and x86_64) with + - Cygwin with MinGW compilers (both x86_32 and x86_64) + - MSYS with MinGW32 (x86_32 only) +- MacOSX (x86_32 and x86_64) + +Use the following command to deploy artifacts for the host platform to a +staging repository. +``` +$ mvn clean deploy -P release +``` +It creates a new staging repository. Go to +https://oss.sonatype.org/#stagingRepositories and find the repository, usually +in the name like ``comgoogle-123``. + +You will want to run this command on a different platform. Remember, in +subsequent deployments you will need to provide the repository name that you +have found in the first deployment so that all artifacts go to the same +repository: +``` +$ mvn clean deploy -P release -Dstaging.repository=comgoogle-123 +``` + +A 32-bit artifact can be deployed from a 64-bit host with +``-Dos.detected.arch=x86_32`` + +When you have done deployment for all platforms, go to +https://oss.sonatype.org/#stagingRepositories, verify that the staging +repository has all the binaries, close and release this repository. + +### Tips for deploying on Windows +Under Windows the following error may occur: ``gpg: cannot open tty `no tty': +No such file or directory``. This can be fixed by configuring gpg through an +active profile in ``.m2\settings.xml`` where also the Sonatype password is +stored: +```xml +<settings> + <servers> + <server> + <id>ossrh</id> + <username>[username]</username> + <password>[password]</password> + </server> + </servers> + <profiles> + <profile> + <id>gpg</id> + <properties> + <gpg.executable>gpg</gpg.executable> + <gpg.passphrase>[password]</gpg.passphrase> + </properties> + </profile> + </profiles> + <activeProfiles> + <activeProfile>gpg</activeProfile> + </activeProfiles> +</settings> +``` + +### Tested build environments +We have succesfully built artifacts on the following environments: +- Linux x86_32 and x86_64: Ubuntu 14.04.2 64-bit +- Windows x86_32: MSYS with ``mingw32-gcc-g++ 4.8.1-4`` on Windows 7 64-bit +- Windows x86_64: Cygwin64 with ``mingw64-x86_64-gcc-g++ 4.8.3-1`` on Windows 7 64-bit +- Mac OS X x86_32 and x86_64: Mac OS X 10.9.5 |