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| ================================================================================ | ||
| THE SCALA REPOSITORY | ||
| Structure and build system | ||
| ================================================================================ | ||
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| This document describes the Scala core (core library and compiler) repository | ||
| and how to build it. For information about Scala as a language, you can visit | ||
| the web site http://www.scala-lang.org/ | ||
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| Part I. The repository layout | ||
| -------------------------------------------------------------------------------- | ||
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| Follows the file layout of the Scala repository. Files marked with a † are not | ||
| part of the Subversion repository but are either automatically generated by the | ||
| build script or user-created if needed. This is not a complete listing. | ||
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| scala/ | ||
| build/ † Build products output directory for ant. | ||
| build.number The version number of the current distribution. | ||
| build.xml The main Ant build script. | ||
| dist/ † The destination folder for Scala distributions. | ||
| docs/ Documentation and sample code. | ||
| lib/ Pre-compiled libraries for the build. | ||
| fjbg.jar The Java byte-code generation library. | ||
| scala-compiler.jar The stable reference ('starr') compiler jar | ||
| scala-library.jar The stable reference ('starr') library jar | ||
| scala-library-src.jar A snapshot of the source used to build starr. | ||
| ant/ Support libraries for ant. | ||
| project/ The (already legacy) 0.7 sbt build. | ||
| README The file you are currently reading. | ||
| src/ All the source files of Scala. | ||
| actors/ The sources of the Actor library. | ||
| compiler/ The sources of the Scala compiler. | ||
| library/ The sources of the core Scala library. | ||
| swing/ The sources of the Swing library. | ||
| target/ † Build products output directory for sbt. | ||
| test/ The Scala test suite. | ||
| tools/ Developer utilities. | ||
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| Part II. Building Scala with SABBUS | ||
| -------------------------------------------------------------------------------- | ||
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| SABBUS is the name of the Ant build script used to compile Scala. It is mostly | ||
| automated and takes care of managing the dependencies. | ||
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| LAYERS: | ||
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| In order to guarantee the bootstrapping of the Scala compiler, SABBUS builds | ||
| Scala in layers. Each layer is a complete compiled Scala compiler and library. | ||
| A superior layer is always compiled by the layer just below it. Here is a short | ||
| description of the four layers that SABBUS uses, from bottom to top: | ||
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| 'starr': the stable reference Scala release which is shared by all the | ||
| developers. It is found in the repository as 'lib/scala-compiler.jar' and | ||
| 'lib/scala-library.jar'. Any committable source code must be compiled directly | ||
| by starr to guarantee the bootstrapping of the compiler. | ||
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| 'locker': the local reference which is compiled by starr and is the work | ||
| compiler in a typical development cycle. When it has been built once, it is | ||
| “frozen” in this state. Updating it to fit the current source code must be | ||
| explicitly requested (see below). | ||
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| 'quick': the layer which is incrementally built when testing changes in the | ||
| compiler or library. This is considered an actual new version when locker is | ||
| up-to-date in relation to the source code. | ||
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| 'strap': a test layer used to check stability of the build. | ||
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| DEPENDANT CHANGES: | ||
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| SABBUS compiles, for each layer, the Scala library first and the compiler next. | ||
| That means that any changes in the library can immediately be used in the | ||
| compiler without an intermediate build. On the other hand, if building the | ||
| library requires changes in the compiler, a new locker must be built if | ||
| bootstrapping is still possible, or a new starr if it is not. | ||
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| REQUIREMENTS FOR SABBUS: | ||
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| The Scala build system is based on Apache Ant. Most required pre-compiled | ||
| libraries are part of the repository (in 'lib/'). The following however is | ||
| assumed to be installed on the build machine: | ||
| - A Java runtime environment (JRE) or SDK 1.6 or above. | ||
| - Apache Ant version 1.7.0 or above. | ||
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| Part III. Common use-cases | ||
| -------------------------------------------------------------------------------- | ||
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| 'ant -p' | ||
| Prints out information about the commonly used ant targets. The interested | ||
| developer can find the rest in the XML files. | ||
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| 'ant' or 'ant build' | ||
| A quick compilation (to quick) of your changes using the locker compiler. | ||
| - This will rebuild all quick if locker changed. | ||
| - This will also rebuild locker if starr changed. | ||
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| 'ln -s build/quick/bin qbin' (once) | ||
| 'ant && qbin/scalac -d sandbox sandbox/test.scala && qbin/scala -cp sandbox Test' | ||
| Incrementally builds quick, and then uses it to compile and run the file | ||
| 'sandbox/test.scala'. This is a typical debug cycle. | ||
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| 'ant replacelocker' | ||
| "unfreezes" locker by updating it to match the current source code. | ||
| - This will delete quick so as not to mix classes compiled with different | ||
| versions of locker. | ||
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| 'ant test' | ||
| Tests that your code is working and fit to be committed. | ||
| - Runs the test suite and bootstrapping test on quick. | ||
| - You can run the suite only (skipping strap) with 'ant test.suite'. | ||
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| 'ant docs' | ||
| Generates the HTML documentation for the library from the sources using the | ||
| scaladoc tool in quick. Note: on most machines this requires more heap than | ||
| is allocate by default. You can adjust the parameters with ANT_OPTS. | ||
| Example command line: | ||
| ANT_OPTS="-Xms512M -Xmx2048M -Xss1M -XX:MaxPermSize=128M" ant docs | ||
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| 'ant dist' | ||
| Builds a distribution. | ||
| - Rebuilds locker from scratch (to make sure it bootstraps). | ||
| - Builds everything twice more and compares bit-to-bit the two builds (to | ||
| make sure it is stable). | ||
| - Runs the test suite (and refuses to build a distribution if it fails). | ||
| - Creates a local distribution in 'dists/latest'. | ||
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| 'ant clean' | ||
| Removes all temporary build files (locker is preserved). | ||
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| 'ant locker.clean' | ||
| Removes all build files. | ||
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| 'ant all.clean' | ||
| Removes all build files (including locker) and all distributions. | ||
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| Many of these targets offer a variant which runs with -optimise enabled. | ||
| Optimized targets include build-opt, test-opt, dist-opt, fastdist-opt, | ||
| replacestarr-opt, replacelocker-opt, and distpack-opt. | ||
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| Part V. Contributing to Scala | ||
| -------------------------------------------------------------------------------- | ||
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| If you wish to contribute, you can find all of the necessary information on | ||
| the official Scala website: www.scala-lang.org. | ||
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| Specifically, you can subscribe to the Scala mailing lists, read all of the | ||
| available documentation, and browse the live SVN repository. You can contact | ||
| the Scala team by sending us a message on one of the mailing lists, or by using | ||
| the available contact form. | ||
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| In detail: | ||
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| - Scala website (links to everything else): | ||
| http://www.scala-lang.org | ||
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| - Scala documentation: | ||
| http://www.scala-lang.org/node/197 | ||
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| - Scala mailing lists: | ||
| http://www.scala-lang.org/node/199 | ||
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| - Scala bug and issue tracker: | ||
| https://issues.scala-lang.org | ||
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| - Scala live SVN source tree: | ||
| http://www.scala-lang.org/node/213 | ||
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| - Contact form: | ||
| http://www.scala-lang.org/node/188 | ||
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| If you are interested in contributing code, we ask you to complete and submit | ||
| to us the Scala Contributor License Agreement, which allows us to ensure that | ||
| all code submitted to the project is unencumbered by copyrights or patents. | ||
| The form is available at: | ||
| http://www.scala-lang.org/sites/default/files/contributor_agreement.pdf | ||
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| Thank you! | ||
| The Scala Team | ||
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| OBSOLETE -- we're over at https://github.com/scala/scala now |