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Changes applied to the icu-57.1 tree as obtained from:
http://download.icu-project.org/files/icu4c/57.1/icu4c-57_1-src.tgz
cd /tmp # or wherever
tar xf icu4c-*-src.tgz
cd .../texlive/Build/source/libs/icu/icu-src
\cp -arf /tmp/icu/* .
rm -r as_is packaging # don't bother including these in our tree
#
# files to add:
svn status | sed -n 's/^\?//p'
svn add `!!`
svn status | sed -n 's/^\?//p' # rerun, should be empty now
#
diff -qr . /tmp/icu/ | sed -n -e 's,^Only in \./\(.*\): ,\1/,p'
svn rm `!!`
diff ... # rerun, should be empty now
# update generic files (still in icu-src):
aux=/usr/local/src/dist/build-aux
cp $aux/config.guess $aux/config.sub $aux/install-sh source/
# apply ./patch-* files, as needed.
# Run svn diff after each, update patch-* file.
# Don't lose our leading comments.
# autoreconf.
# rebuild; must rerun configure (not just config.status),
# so easiest is to just do a whole new build.
# That will also test use of the new icu version by our programs.
# Assuming all seems ok, reduce size of source/data/in/icudt*.dat
# to decrease data segment size, e.g., for old BSD. First, check
# that we successfully built the full .dat:
srcdat=.../source/libs/icu/icu-src/source/data/in/icudt57l.dat
cd .../Work/libs/icu/icu-build/data/out/build/icudt57l
indat=../../tmp/icudt57l.dat
diff $srcdat $indat
# should be identical, amazingly enough.
# we need to use icupkg, which may need LD_LIBRARY_PATH since it is a
# C++ binary and we didn't cxx-hack it.
icupkg="env LD_LIBRARY_PATH=$gnu/lib ../../../../bin/icupkg"
# then remove some unused-by-xetex elements, as discussed with xetex dev.
outdat=icudt57l.dat
$icupkg -r 'curr/*' $indat $outdat && mv $outdat $indat
$icupkg -r 'lang/*' $indat $outdat && mv $outdat $indat
$icupkg -r 'region/*' $indat $outdat && mv $outdat $indat
$icupkg -r 'rfc*.spp' $indat $outdat && mv $outdat $indat
$icupkg -r 'zone/*' $indat $outdat && mv $outdat $indat
ls -l $indat $srcdat # indat should be much smaller
cp $indat $srcdat
# then commit.
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