icu
icu is the "International Components for Unicode", a library used by other programs requiring Unicode support.
Installation
USE flags
USE flags for dev-libs/icu International Components for Unicode
debug
|
Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces |
doc
|
Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally |
examples
|
Install examples, usually source code |
static-libs
|
Build static versions of dynamic libraries as well |
test
|
Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently) |
verify-sig
|
Verify upstream signatures on distfiles |
Emerge
The dev-libs/icu package usually doesn't need to be installed manually; it should be pulled in as-required when installing other software that uses it.
root #emerge --ask dev-libs/icuUpgrading
When a new version of dev-libs/icu becomes available, trying to update one's system via emerge can result in copious output along the lines of:
WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict:
dev-libs/icu:0
(dev-libs/icu-74.1:0/74.1::gentoo, ebuild scheduled for merge) USE="-debug -doc -examples -static-libs -test -verify-sig" ABI_X86="32 (64) (-x32)" conflicts with
dev-libs/icu:0/73.1= required by (dev-libs/xerces-c-3.2.4-r2:0/0::gentoo, installed) USE="iconv icu -curl -doc -examples -static-libs -test -threads" ABI_X86="(64)" CPU_FLAGS_X86="sse2"
^^^^^^^^
dev-libs/icu:0/73.1= required by (x11-libs/vte-0.74.2:2.91/2.91::gentoo, installed) USE="crypt icu introspection vala -debug -gtk-doc -systemd -vanilla" ABI_X86="(64)"
^^^^^^^^
dev-libs/icu:0/73.1=[abi_x86_64(-)] required by (net-fs/samba-4.18.8:0/0::gentoo, installed) USE="acl client cups pam regedit system-mitkrb5 zeroconf -addc -ads -ceph -cluster -debug (-fam) -glusterfs -gpg -iprint -json -ldap -llvm-libunwind -profiling-data -python -quota (-selinux) -snapper -spotlight -syslog (-system-heimdal) -systemd (-test) -unwind -winbind" ABI_X86="(64) -32 (-x32)" CPU_FLAGS_X86="aes" PYTHON_SINGLE_TARGET="python3_11 -python3_10"
^^^^^^^^
The simplest way to upgrade is to directly ask emerge to install the new version. For example, if the new version is 74.1:
root #emerge --ask --ignore-world dev-libs/icu:0/74.1Once installation is completed, rebuild the relevant libraries:
root #emerge @preserved-rebuildHowever, note that if any installed packages require an older version of dev-libs/icu, emerge will want to downgrade the package to that version; in that case, those packages will need updates before the latest version of dev-libs/icu can be used on the system.