Re: [icu-support] Problem using ICU Data Build Tool - library size is not reduced

[Andy G. <an...@he...>]

When I built a custom data file, after unzipping the icu4c-*-data.zip I had to delete the pre-built full data file before building.
Here’s the in-house documentation I wrote for my future self:


  1.  Browse to site.icu-project.org/download
  2.  Determing the latest version of ICU (XX.Y) and download the ICU4C files:
     *   icu4c-XX_Y-src.tgz
     *   icu4c-XX_Y-data.zip
  3.  Unpack the files (e.g. for ICU version 64.2)
     *   wget https://github.com/unicode-org/icu/releases/download/release-64-2/icu4c-64_2-src.tgz
     *   wget https://github.com/unicode-org/icu/releases/download/release-64-2/icu4c-64_2-data.zip
     *   tar xfz icu4c-64_2-src.tgz
     *   cd icu/source
     *   unzip ../../icu4c-64_2-data.zip
  4.  Set environment variable to point to data build filters json
     *   export ICU_DATA_FILTER_FILE=<path>filters.json
  5.  Remove the pre-built full data file
     *   rm data/in/icudt64l.dat
  6.  Build

     *   export LD_LIBRARY_PATH=/opt/gcc-4.8.3/lib64
     *   ./runConfigureICU Linux/gcc --enable-static --disable-shared
     *   make clean
     *   make

Hope this helps. No guarantees this is correct, it’s just what worked for me.

From: Shane Carr via icu-support <icu...@li...>
Sent: 19 September 2019 18:26
To: ICU support mailing list <icu...@li...>
Cc: Shane Carr <sf...@go...>
Subject: Re: [icu-support] Problem using ICU Data Build Tool - library size is not reduced

Did you remember to download the data sources and populate the data directory with them? This paragraph on the doc page:

You must have the data sources in order to use the ICU Data Build Tool. Check for the file icu4c/source/data/locales/root.txt. If that file is missing, you need to download "icu4c-*-data.zip" and replace the contents of icu4c/source/data with the data directory from the zip file.

If you already did that step, let me know and I'll look closer.

On Thu, Sep 19, 2019, 8:03 AM Markus Scherer <mar...@gm...<mailto:mar...@gm...>> wrote:
Hi Richard,

On Thu, Sep 19, 2019 at 4:20 AM Richard Ash via icu-support <icu...@li...<mailto:icu...@li...>> wrote:
I use the ICU library to add Regular Expression support to the SQLite
database in an embedded system. The database strings only contain
characters from the ASCII charset. As such, we are shipping a lot of
ICU data which is never used by the code.

I will ask Shane to look at your config, but if you only need regex with the more common Unicode properties (e.g., not using \N{character name}), the data for those is baked into the "common" library, so you may be able to just use the stubdata library and no .dat file at all.

Best regards,
markus
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