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nodejs/doc/guides/maintaining-zlib.md
Sam Roberts 0d95eda499 doc: describe how to update zlib 
See:
- https://github.com/nodejs/node/pull/31201

PR-URL: https://github.com/nodejs/node/pull/31800
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
2020-02-24 11:52:51 -08:00

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Maintaining zlib

This copy of zlib comes from the Chromium team's zlib fork which incorporated performance improvements not currently available in standard zlib.

Updating zlib

Update zlib:

git clone https://chromium.googlesource.com/chromium/src/third_party/zlib
cp deps/zlib/zlib.gyp deps/zlib/win32/zlib.def deps
rm -rf deps/zlib zlib/.git
mv zlib deps/
mv deps/zlib.gyp deps/zlib/
mkdir deps/zlib/win32
mv deps/zlib.def deps/zlib/win32
sed -i -- 's_^#include "chromeconf.h"_//#include "chromeconf.h"_' deps/zlib/zconf.h

Check that Node.js still builds and tests.

It may be necessary to update deps/zlib/zlib.gyp if any significant changes have occurred upstream.

Commiting zlib

Add zlib: git add --all deps/zlib

Commit the changes with a message like

deps: update zlib to upstream d7f3ca9

Updated as described in doc/guides/maintaining-zlib.md.