#### Beyond Linux® From Scratch (System V Edition) - Version 12.3

### Chapter 9. General Libraries

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# icu-76.1

## Introduction to ICU

The International Components for Unicode (ICU) package is a mature, widely used set of C/C++ libraries providing Unicode and Globalization support for software applications. ICU is widely portable and gives applications the same results on all platforms.

### Warning

Upgrading this package to a new major version (for example, from 72.1 to 76.1) will require rebuilding many other packages. If some packages that use the libraries built by icu4c-76 are rebuilt, they will use the new libraries while current packages will use the previous libraries. If the Linux application loader (`/usr/lib/ld-linux-x86-64.so.2`) determines that both the old and new libraries are needed, and a symbol (name of data or function) exists in both versions of the library, all references to the symbol will be resolved to the version appearing earlier in the breadth-first sequence of the dependency graph. This may result in the application failing if the definition of the data or the behavior of the function referred by the symbol differs between two versions. To avoid the issue, users will need to rebuild every package linked to an ICU library as soon as possible once ICU is updated to a new major version.

To determine what external libraries are needed (directly or indirectly) by an application or a library, run:

    ldd <application or library>

or to see only programs and libraries that directly use a library:

    readelf -d  <application or library> | grep NEEDED

This package is known to build and work properly using an LFS 12.3 platform.

### Package Information

- Download (HTTP): https://github.com/unicode-org/icu/releases/download/release-76-1/icu4c-76_1-src.tgz

- Download MD5 sum: 857fdafff8127139cc175a3ec9b43bd6

- Download size: 26 MB

- Estimated disk space required: 397 MB (add 46 MB for tests)

- Estimated build time: 1.0 SBU (Using parallelism=4; add 1.8 SBU for tests)

### ICU Dependencies

#### Optional

Doxygen-1.13.2 (for documentation)

## Installation of ICU

### Note

This package expands to the directory `icu`.

Install ICU by running the following commands:

    cd source                 &&

    ./configure --prefix=/usr &&
    make

To test the results, issue: make check.

Now, as the `root` user:

    make install

## Contents

Installed Programs: derb, escapesrc, genbrk, genccode, gencfu, gencmn, gencnval, gendict, gennorm2, genrb, gensprep, icu-config, icuexportdata, icuinfo, icupkg, makeconv, pkgdata, and uconv
Installed Libraries: libicudata.so, libicui18n.so, libicuio.so, libicutest.so, libicutu.so, and libicuuc.so
Installed Directories: /usr/include/unicode, /usr/lib/icu, and /usr/share/icu

### Short Descriptions

derb | disassembles a resource bundle
escapesrc | converts “\u” escaped characters into unicode characters
genbrk | compiles ICU break iteration rules source files into binary data files
genccode | generates C or platform specific assembly code from an ICU data file
gencfu | reads in Unicode confusable character definitions and writes out the binary data
gencmn | generates an ICU memory-mappable data file
gencnval | compiles the converter's aliases file
gendict | compiles word lists into ICU string trie dictionaries
gennorm2 | builds binary data files with Unicode normalization data
genrb | compiles a resource bundle
gensprep | compiles StringPrep data from filtered RFC 3454 files
icu-config | outputs ICU build options
icuinfo | outputs configuration information about the current ICU
icupkg | extracts or modifies an ICU .dat archive
makeconv | compiles a converter table
pkgdata | packages data for use by ICU
uconv | converts data from one encoding to another
`libicudata.so` | is the data library
`libicui18n.so` | is the internationalization (i18n) library
`libicuio.so` | is the ICU I/O (unicode stdio) library
`libicutest.so` | is the test library
`libicutu.so` | is the tool utility library
`libicuuc.so` | is the common library

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