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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

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<head>

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<title>ReadMe for ICU 69.1</title>

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<!-- meta name="COPYRIGHT" content=

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"ICU; International Components for Unicode; ICU4C; what's new; readme; read me; introduction; downloads; downloading; building; installation;" />

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"The introduction to the International Components for Unicode with instructions on building, installation, usage and other information about ICU." />

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</head>

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<!--

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classes to use with the "body" -

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draft - if the release note is itself a draft (May be combined with the other two)

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rc - if the release note is a release candidate

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milestone - if the release note is a milestone release

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-->

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Note: This is a draft readme.

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<h1>

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DRAFT

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International Components for Unicode

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Release Candidate

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(Preview Release)

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<abbr title="International Components for Unicode">ICU</abbr> 69.1 ReadMe

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</h1>

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<!-- This is a development milestone release of ICU

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This milestone is intended for those wishing to get an early look at new features and API changes.

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It is not recommended for production use. -->

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This is a preview release of ICU.

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It is not recommended for production use.

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This is a release candidate version of ICU4C.

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It is not recommended for production use.

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Last updated: 2021-Mar-16

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<a href="http://www.unicode.org/copyright.html">http://www.unicode.org/copyright.html</a>

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<hr/>

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<h2 class="TOC">Table of Contents</h2>

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<li><a href="#Introduction">Introduction</a></li>

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<li><a href="#GettingStarted">Getting Started</a></li>

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<li><a href="#News">What Is New In This Release?</a></li>

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<li><a href="#Download">How To Download the Source Code</a></li>

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<li><a href="#SourceCode">ICU Source Code Organization</a></li>

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<li>

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<a href="#HowToBuild">How To Build And Install ICU</a>

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<ul >

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<li><a href="#RecBuild">Recommended Build Options</a></li>

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<li><a href="#UserConfig">User-Configurable Settings</a></li>

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<li><a href="#HowToBuildWindows">Windows</a></li>

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<li><a href="#HowToBuildCygwin">Cygwin</a></li>

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<li><a href="#HowToBuildOS400">IBM i family (IBM i, i5/OS, OS/400)</a></li>

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<li><a href="#HowToCrossCompileICU">How to Cross Compile ICU</a></li>

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</ul>

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</li>

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<li><a href="#HowToPackage">How To Package ICU</a></li>

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<li>

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<a href="#ImportantNotes">Important Notes About Using ICU</a>

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<ul >

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<li><a href="#ImportantNotesMultithreaded">Using ICU in a Multithreaded

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Environment</a></li>

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<li><a href="#ImportantNotesWindows">Windows Platform</a></li>

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<li><a href="#ImportantNotesUNIX">UNIX Type Platforms</a></li>

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</ul>

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</li>

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<li>

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<a href="#PlatformDependencies">Platform Dependencies</a>

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<ul >

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<li><a href="#PlatformDependenciesNew">Porting To A New

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Platform</a></li>

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<li><a href="#PlatformDependenciesImpl">Platform Dependent

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Implementations</a></li>

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</ul>

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</li>

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</ul>

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<hr />

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<h2><a name="Introduction" href="#Introduction" id=

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"Introduction">Introduction</a></h2>

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Today's software market is a global one in which it is desirable to

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develop and maintain one application (single source/single binary) that

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supports a wide variety of languages. The International Components for

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Unicode (ICU) libraries provide robust and full-featured Unicode services on

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a wide variety of platforms to help this design goal. The ICU libraries

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provide support for:

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<ul>

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<li>The latest version of the Unicode standard</li>

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<li>Character set conversions with support for over 220 codepages</li>

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<li>Locale data for more than 300 locales</li>

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<li>Language sensitive text collation (sorting) and searching based on the

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Unicode Collation Algorithm (=ISO 14651)</li>

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<li>Regular expression matching and Unicode sets</li>

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<li>Transformations for normalization, upper/lowercase, script

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transliterations (50+ pairs)</li>

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<li>Resource bundles for storing and accessing localized information</li>

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<li>Date/Number/Message formatting and parsing of culture specific

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input/output formats</li>

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<li>Calendar specific date and time manipulation</li>

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<li>Text boundary analysis for finding characters, word and sentence

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boundaries</li>

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</ul>

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ICU has a sister project ICU4J that extends the internationalization

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capabilities of Java to a level similar to ICU. The ICU C/C++ project is also

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called ICU4C when a distinction is necessary.

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<h2><a name="GettingStarted" href="#GettingStarted" id=

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"GettingStarted">Getting started</a></h2>

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This document describes how to build and install ICU on your machine. For

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other information about ICU please see the following table of links.

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The ICU homepage also links to related information about writing

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internationalized software.

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Here are some useful links regarding ICU and internationalization in

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general.

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</caption>

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<tr>

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<td>ICU, ICU4C & ICU4J Homepage</td>

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<td><a href=

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"http://icu-project.org/">http://icu-project.org/</a></td>

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</tr>

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<tr>

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<td>FAQ - Frequently Asked Questions about ICU</td>

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<td><a href=

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"https://unicode-org.github.io/icu/userguide/icufaq">https://unicode-org.github.io/icu/userguide/icufaq</a></td>

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</tr>

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<tr>

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<td>ICU User's Guide</td>

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<td><a href=

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"https://unicode-org.github.io/icu/userguide/">https://unicode-org.github.io/icu/userguide/</a></td>

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</tr>

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<tr>

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<td><a href=

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"https://unicode-org.github.io/icu/userguide/howtouseicu">https://unicode-org.github.io/icu/userguide/howtouseicu</a></td>

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</tr>

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<tr>

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<td>Download ICU Releases</td>

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<td><a href=

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"http://site.icu-project.org/download">http://site.icu-project.org/download</a></td>

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</tr>

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<tr>

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<td>ICU4C API Documentation Online</td>

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<td><a href=

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"http://icu-project.org/apiref/icu4c/">http://icu-project.org/apiref/icu4c/</a></td>

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</tr>

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<tr>

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<td>Online ICU Demos</td>

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<td><a href=

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"http://demo.icu-project.org/icu-bin/icudemos">http://demo.icu-project.org/icu-bin/icudemos</a></td>

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</tr>

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<tr>

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<td>Contacts and Bug Reports/Feature Requests</td>

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<td><a href=

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"http://site.icu-project.org/contacts">http://site.icu-project.org/contacts</a></td>

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</tr>

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</table>

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Important: Please make sure you understand the <a href=

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"http://source.icu-project.org/repos/icu/trunk/icu4c/LICENSE">Copyright and License Information</a>.

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<h2><a name="News" href="#News" id="News">What Is New In This Release?</a></h2>

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See the <a href="http://site.icu-project.org/download/69">ICU 69 download page</a>

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for more information on this release, including any other changes, bug fixes, known issues,

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changes to supported platforms and build environments,

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and migration issues for existing applications migrating from previous ICU releases.

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See the <a href="APIChangeReport.html">API Change Report</a> for a complete list of

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APIs added, removed, or changed in this release.

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<a name="RecentPreviousChanges" id="RecentPreviousChanges"></a>For

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changes in previous releases, see the

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main <a href="http://site.icu-project.org/download">ICU download page</a>

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with its version-specific subpages.

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<h2><a name="Download" href="#Download" id="Download">How To Download the

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Source Code</a></h2>

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There are two ways to download ICU releases:

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<ul>

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<li>Official Release Snapshot:

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If you want to use ICU (as opposed to developing it), you should download

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an official packaged version of the ICU source code. These versions are

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tested more thoroughly than day-to-day development builds of the system,

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and they are packaged in zip and tar files for convenient download. These

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packaged files can be found at <a href=

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"http://site.icu-project.org/download">http://site.icu-project.org/download</a>.

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The packaged snapshots are named icu-nnnn.zip or

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icu-nnnn.tgz, where nnnn is the version number. The .zip

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file is used for Windows platforms, while the .tgz file is preferred on

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most other platforms.

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Please unzip this file. </li>

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<li>GitHub Source Repository:

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If you are interested in developing features, patches, or bug fixes for

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ICU, you should probably be working with the latest version of the ICU

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source code. You will need to clone and checkout the code from our GitHub repository to

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ensure that you have the most recent version of all of the files. See our

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<a href="http://site.icu-project.org/repository">source

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repository</a> for details.</li>

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</ul>

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<h2><a name="SourceCode" href="#SourceCode" id="SourceCode">ICU Source Code

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Organization</a></h2>

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In the descriptions below, <ICU> is the full

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path name of the ICU directory (the top level directory from the distribution

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archives) in your file system. You can also view the <a href=

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"https://unicode-org.github.io/icu/userguide/design">ICU Architectural

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Design</a> section of the User's Guide to see which libraries you need for

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your software product. You need at least the data (<code>[lib]icudt</code>)

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and the common (<code>[lib]icuuc</code>) libraries in order to use ICU.

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The following files describe the code drop.

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</caption>

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<tr>

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<th scope="col">Description</th>

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</tr>

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<tr>

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<td>readme.html</td>

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<td>Describes the International Components for Unicode (this file)</td>

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</tr>

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<tr>

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<td>LICENSE</td>

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<td>Contains the text of the ICU license</td>

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</tr>

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</table>

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<table class="docTable" summary=

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"The following directories contain source code and data files.">

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The following directories contain source code and data files.

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</caption>

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<tr>

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<th scope="col">Directory</th>

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<th scope="col">Description</th>

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</tr>

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<tr>

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<td><ICU>/source/common/</td>

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<td>The core Unicode and support functionality, such as resource bundles,

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character properties, locales, codepage conversion, normalization,

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Unicode properties, Locale, and UnicodeString.</td>

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</tr>

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<tr>

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<td><ICU>/source/i18n/</td>

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<td>Modules in i18n are generally the more data-driven, that is to say

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resource bundle driven, components. These deal with higher-level

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internationalization issues such as formatting, collation, text break

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analysis, and transliteration.</td>

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</tr>

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<tr>

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<td><ICU>/source/layoutex/</td>

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<td>Contains the ICU paragraph layout engine.</td>

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</tr>

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<tr>

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<td><ICU>/source/io/</td>

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<td>Contains the ICU I/O library.</td>

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</tr>

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<tr>

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<td><ICU>/source/data/</td>

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<td>

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This directory contains the source data in text format, which is

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compiled into binary form during the ICU build process. It contains

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several subdirectories, in which the data files are grouped by

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function. Note that the build process must be run again after any

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changes are made to this directory.

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If some of the following directories are missing, it's probably

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because you got an official download. If you need the data source files

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for customization, then please download the complete ICU source code from <a

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href="http://site.icu-project.org/repository">the ICU repository</a>.

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<ul>

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<li>in/ A directory that contains a pre-built data library for

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ICU. A standard source code package will contain this file without

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several of the following directories. This is to simplify the build

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process for the majority of users and to reduce platform porting

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issues.</li>

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<li>brkitr/ Data files for character, word, sentence, title

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casing and line boundary analysis.</li>

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<li>coll/ Data for collation tailorings. The makefile

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colfiles.mk contains the list of resource bundle files.</li>

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<li>locales/ These .txt files contain ICU language and

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culture-specific localization data. Two special bundles are

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root, which is the fallback data and parent of other bundles,

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and index, which contains a list of installed bundles. The

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makefile resfiles.mk contains the list of resource bundle

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files. Some of the locale data is split out into the type-specific

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directories curr, lang, region, unit, and zone, described below.</li>

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<li>curr/ Locale data for currency symbols and names (including

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plural forms), with its own makefile resfiles.mk.</li>

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<li>lang/ Locale data for names of languages, scripts, and locale

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key names and values, with its own makefile resfiles.mk.</li>

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<li>region/ Locale data for names of regions, with its own

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makefile resfiles.mk.</li>

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<li>unit/ Locale data for measurement unit patterns and names,

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with its own makefile resfiles.mk.</li>

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<li>zone/ Locale data for time zone names, with its own

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makefile resfiles.mk.</li>

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<li>mappings/ Here are the code page converter tables. These

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.ucm files contain mappings to and from Unicode. These are compiled

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into .cnv files. convrtrs.txt is the alias mapping table from

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various converter name formats to ICU internal format and vice versa.

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It produces cnvalias.icu. The makefiles ucmfiles.mk,

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ucmcore.mk, and ucmebcdic.mk contain the list of

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converters to be built.</li>

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<li>translit/ This directory contains transliterator rules as

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resource bundles, a makefile trnsfiles.mk containing the list

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of installed system translitaration files, and as well the special

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bundle translit_index which lists the system transliterator

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aliases.</li>

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<li>unidata/ This directory contains the Unicode data files.

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Please see <a href=

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"http://www.unicode.org/">http://www.unicode.org/</a> for more

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information.</li>

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<li>misc/ The misc directory contains other data files which

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did not fit into the above categories, including time zone

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information, region-specific data, and other data derived from CLDR

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supplemental data.</li>

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<li>out/ This directory contains the assembled memory mapped

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files.</li>

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<li>out/build/ This directory contains intermediate (compiled)

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files, such as .cnv, .res, etc.</li>

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</ul>

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If you are creating a special ICU build, you can set the ICU_DATA

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environment variable to the out/ or the out/build/ directories, but

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this is generally discouraged because most people set it incorrectly.

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You can view the <a href=

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"https://unicode-org.github.io/icu/userguide/icudata">ICU Data

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Management</a> section of the ICU User's Guide for details.

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</td>

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</tr>

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<tr>

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<td><ICU>/source/test/intltest/</td>

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<td>A test suite including all C++ APIs. For information about running

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the test suite, see the build instructions specific to your platform

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later in this document.</td>

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</tr>

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<tr>

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<td><ICU>/source/test/cintltst/</td>

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<td>A test suite written in C, including all C APIs. For information

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about running the test suite, see the build instructions specific to your

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platform later in this document.</td>

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</tr>

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<tr>

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<td><ICU>/source/test/iotest/</td>

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<td>A test suite written in C and C++ to test the icuio library. For

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information about running the test suite, see the build instructions

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specific to your platform later in this document.</td>

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</tr>

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<tr>

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<td><ICU>/source/test/testdata/</td>

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<td>Source text files for data, which are read by the tests. It contains

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the subdirectories out/build/ which is used for intermediate

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files, and out/ which contains testdata.dat.</td>

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</tr>

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<tr>

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<td><ICU>/source/tools/</td>

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<td>Tools for generating the data files. Data files are generated by

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invoking <ICU>/source/data/build/makedata.bat on Win32 or

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<ICU>/source/make on UNIX.</td>

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</tr>

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<tr>

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<td><ICU>/source/samples/</td>

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<td>Various sample programs that use ICU</td>

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</tr>

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<tr>

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<td><ICU>/source/extra/</td>

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[499] Fix | Delete

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