blob: 2f5eb55538c57bb0d6800bd59ff4ba5cda0f91af [file] [log] [blame]
Name: icu
Version: 56.1
License: MIT
Security Critical: yes
This directory contains the source code of ICU 56.1 for C/C++.
A. How to update ICU
1. Run "scripts/ <version>" (e.g. 56-1).
This will download ICU from the upstream svn repository.
It does preserve Chrome-specific build files (* and
converter files. (see section C)
2. Update the source file lists for i18n and common
in icu.gypi and See the comments in the files.
3. Review and apply patches/changes in "D. Local Modifications" if
necessary/applicable. Update patch files in patches/.
4. Follow the instructions in section B on building ICU data files
B. How to build ICU data files
Pre-built data files are generated and checked in with the following steps
1. icu data files for Chrome OS, Linux, Mac and Windows
a. Make a icu data build directory outside the Chromium source tree
and cd to that directory (say, $ICUBUILDIR).
b. Run
${CHROME_ICU_TREE_TOP}/source/runConfigureICU Linux --disable-layout
c. Run make
'make' will fail when pkgdata looks for css3transform.res. This
is expected. See
d. Run
The full locale data for Chrome's UI languages and their select variants
and the bare minimum locale data for other locales will be kept.
e. Run
This makes icudt${version}l.dat and icudt${version}l_dat.S
f. Run
This copies the ICU data file for non-Android platform
and the corresponding assembly source files for Linux and Mac to
the following places.
g. Run
On top of (step d), further cuts the data entries for Android.
h. Run
This makes icudt${version}l.dat and icudt${version}l_dat.S for Android.
i. Run
This copies icu data files for Android to the following locations:
j. Run
This reverts the result of and and
make the tree ready for committing updated ICU data files for
non-Android and Android platforms.
k. Whenever data is updated (e.g timezone update), follow d ~ j as long
as the ICU build directory used in a ~ c is kept. Besides, icudt.dll for
Windows has to be udpated following the procedure described below.
2. icu data dll for Windows (non-default build option)
Follow these steps to build windows/icudt.dll. By default, we set
icu_use_icu_data_flag to 1 and don't use this file.
a. check out a clean copy of icu56 from the upstream on Windows
outside the Chrome tree.
$ svn export --native-eol LF ${SEPARATE_ICU_ROOT}/icu56
b. copy ${CHROME_ICU_ROOT}/common/icudtl.dat to
c. copy ${CHROME_ICU_ROOT}/source/data/makedata.mak to
c. In Visual Studio, open source/allinone/allinone.sln solution
d. Build 'makedata' target
e. icudt56.dll will be generated in ${SEPARATE_ICU_ROOT}/bin
f. Copy that icudt56.dll to ${CHROME_ICU_ROOT}/windows/icudt.dll
and check that in.
3. Note on the locale data customization
- scripts/
a. Trim the locale data for Chrome's UI langauges :
locales, lang, region, currency, zone
b. Trim the locale data for non-UI languages to the bare minimum :
ExemplarCharacters, LocaleScript, layout, and the name of the
language for a locale in its native language.
c. Remove the legacy Chinese character set-based collation
(big5han/gb2312han) that don't make any sense and nobdoy uses.
- android/
a. Make changes to source/data/{region,lang} to exclude these data
except the language and script names of zh_Hans and zh_Hant.
b. Remove exemplar cities in timezone data (data/zone).
c. Keep only the minimal calendar data in data/locales.
d. Include currency display names for a smaller subset of currencies.
e. Minimize the locale data for 9 locales to which Chrome on Android
is not localized.
f. Also apply android/brkitr.patch
- android/brkitr.patch
Do not use the C+J dictionary for Chinese/Japanese segmentation
to reduce the data size. Adjust word.txt and a few other files.
C. Chromium-specific data build files and converters
They're preserved in step A.1 above. In general, there's no need to touch
them when updating ICU.
1. source/data/mappings
- convrtrs.txt : Lists encodings and aliases required by the WHATWG
Encoding spec plus a few extra (see the file as to why).
- ucmlocal.txt : to list only converters we need.
- *html.ucm: Mapping files per WHATWG encoding standards for EUC-JP,
Shift_JIS, Big5 (Big5+Big5HKSCS), EUC-KR and all the single byte encodings.
They're generated with scripts/{eucjp,sjis,big5,euckr,single_byte}
- gb18030.ucm and windows-936.ucm
gb_table.patch was applied for the following changes.
a. Map \xA3\xA0 to U+3000 instead of U+E5E5 in gb18030 and windows-936 per
the encoding spec (one-way mapping in toUnicode direction).
b. Map \xA8\xBF to U+01F9 instead of U+E7C8. Add one-way map
from U+1E3F to \xA8\xBC (windows-936/GBK).
2. source/data/*/*
- List locales of interest to Chromium
a. Chrome's UI languages
b. Variants of UI languages
c. Other locales in Accept-Language list : will only have bare minimum
locale data
- drops all *loose.brk to save space ( ~370kB) for now.
3. source/data/brkitr
- khmerdict.txt: Abridged Khmer dictionary. See
- word_ja.txt (used only on Android)
Added for Japanese-specific word-breaking without the C+J dictionary.
4. source/data/trnslit/css3transform.txt
- Handle Greek case conversion with a transliterator
5. Add {an,ast,ckb,ku,tg,wa}.txt to source/data/{locale,lang}
with the minimal locale data necessary for spellchecker and
and language menus. Also change the English display name
for ckb to 'Kurdish (Arabic)'.
D. Local Modifications
1. Applied locale data patches from Google obtained by diff'ing
the upstream copy and Google's internal copy for source/data
- patches/locale_google.patch:
* Google's internal ICU locale changes
* Simpler region names for Hong Kong and Macau in all locales
* Currency signs in ru and uk locales (do not include 'tr' locale changes)
* AM/PM, midnight, noon formatting for a few Indian locales
* Timezone name changes in Korean and Chinese locales
- patches/locale1.patch: Minor fixes for Korean
2. Applied post-56 fixes from the upstream for measure/date format bugs
- patches/measure_format.patch: combined patch of 12 CLs taken
from bugs below.
- upstream bugs
- patches/relative_date.patch from Android
3. Breakiterator patches
- patches/linebrk.patch
a. Drop *_loose.txt for all locales and use the corresponding normal.txt
b. Drop local patches we used to have for the following issues. They'll
be dealt with in the upstream (Unicode/CLDR). (
- patches/wordbrk.patch for word.txt
a. Move full stops (U+002E, U+FF0E) from MidNumLet to MidNum so that
FQDN labels can be split at '.'
b. Move fullwidth digits (U+FF10 - U+FF19) from Ideographic to Numeric.
- patches/khmer-dictbe.patch
Adjust parameters to use a smaller Khmer dictionary (khmerdict.txt).
- Add several common Chinese words that were dropped previously to
patch: patches/cjdict.patch
upstream bug:
4. Timezone data update
Run scripts/ to grab the latest version of the
following timezone data files and put them in source/data/misc
As of July 26, 2016, the latest version is 2016f and the above files
are available at
5. Build-related changes
- patches/wpo.patch
upstream bugs :
- patches/vscomp.patch for building with Visual Studio on Windows.
a. do not use WINDOWS_LOCALE_API in locmap.c
b. do not redefine stringpiece::npos
c. fix (C4138 warning)
d. fix (C4275 warning)
- patches/ :
Remove unnecessary resources : unames, collator rule source
- patches/ :
Windows-only data build patch.
- patches/data_symb.patch :
Put ICU_DATA_ENTRY_POINT(icudtXX_dat) in common when we use
the icu data file or icudt.dll
6. Apply a timezone detection API fix
- patches/tzdetect.patch
- upstream bugs
7. Fix 'bad cast' found in Transliterator with a cfi build
- patches/xlit_badcast.patch
- upstream bug (fixed in the upstream. Will be in ICU 57 release)
8. Add back UTF-32 converters temporarily even when
removed from Blink. See and
- patches/utf32.patch
9. Fix a UText bug found in uregex_open fuzzer.
- patches/utext.patch
- upstream bug (fixed in trunk in Jan, 2016. Will be in ICU 57 release)
10. Fix a bug in regex compiler.
- patches/regexcmp.patch
- upstream bug (fixed in the upstream. Will be in ICU 57 release)
11. Remove an unnecessary static initializer
- patches/remove_si.patch
- upstream bug (fixed in trunk. Will be in ICU 57 release)
12. Cherry pick locale data fixes from the upstream and Android
- patches/locale_extra.patch
- upstream bugs (en-AU date format) (percent sign in ar and fa)
- Android patch for the 2nd bug
13. Add Emoji properties support by cherry-picking from 57.1
- patches/emoji_props.patch
- Upstream change cherry-picked
- source/data/in/{pnames,uprops}.icu were copied from the upstream,
but they're just for the record. Their contents are hard-coded
in the source files patched by the above patch.