Update ZLib 3rdparty library to use ZLib-ng and Minizip-ng so patching is not necessary

[dbs4261]

Type

• Bug fix (non-breaking change which fixes an issue): Fixes #
• New feature (non-breaking change which adds functionality). Resolves #
• Breaking change (fix or feature that would cause existing functionality to not work as expected) Resolves #

Motivation and Context

Open3D has used a patched version of ZLib that was patched to also build minizip. This causes problems when including Open3D in a larger project if some other dependency provides a version of ZLib that isn't patched before Open3D's provider is called. The current approach of WITH_MINIZIP is not descriptive enough, firstly because it can only be used with a system installed minizip package, and secondly the option is not connected to using a system version of ZLib. With this change, external dependency providers like the system package manager or VCPKG could provide one or both of these dependencies. If only a system zlib is provided, minizip will be built from source. This patch uses the NG versions of these libraries in comparability mode purely because the updated cmake build system is easier to integrate with. Existing builds using the WITH_MINIZIP option will not break as minizip will be provided by default, however the unused option will produce a warning from cmake.

Checklist:

• I have run python util/check_style.py --apply to apply Open3D code style
  to my code.
• This PR changes Open3D behavior or adds new functionality.
  • Both C++ (Doxygen) and Python (Sphinx / Google style) documentation is
    updated accordingly.
  • I have added or updated C++ and / or Python unit tests OR included test
    results (e.g. screenshots or numbers) here.
• I will follow up and update the code if CI fails.
• For fork PRs, I have selected Allow edits from maintainers.

Description

This patch changes the ZLib provider to provide the ZLib-ng library in compatibility mode without any patch. Additionally it adds a Minizip-ng provider also in compatibility mode. Both of these providers are now optional, and can instead use find_package(...) if USE_SYSTEM_ZLIB and USE_SYSTEM_MINIZIP are turned on respectively.

[update-docs]

Thanks for submitting this pull request! The maintainers of this repository would appreciate if you could update the CHANGELOG.md based on your changes.

[meetgandhi-dev]

I think You should set USE_SYSTEM_ZLIB to OFF if the package can't be found.

[dbs4261]

Good call, I'll make that update

…

On Tue, Oct 29, 2024, 21:39 Meet Gandhi ***@***.***> wrote: ***@***.**** commented on this pull request. ------------------------------ In 3rdparty/find_dependencies.cmake <#7022 (comment)>: > @@ -853,6 +853,25 @@ if (BUILD_LIBREALSENSE) endif() endif() +if(USE_SYSTEM_ZLIB) + open3d_find_package_3rdparty_library(3rdparty_zlib + PACKAGE ZLIB + TARGETS ZLIB::ZLIB + ) + list(APPEND Open3D_3RDPARTY_PRIVATE_TARGETS_FROM_SYSTEM Open3D::3rdparty_zlib) I think You should set USE_SYSTEM_ZLIB to OFF if the package can't be found. — Reply to this email directly, view it on GitHub <#7022 (review)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABW54TMKOAU44GVRLK7LFHDZ6BPGPAVCNFSM6AAAAABQNDMACKVHI2DSMVQWIX3LMV43YUDVNRWFEZLROVSXG5CSMV3GSZLXHMZDIMBTGU4DQOJQHE> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[ssheorey]

Thanks @dbs4261. Looks good in general. We can merge after:

• addressing @meetgandhi-dev 's comment
• CI passes. Please check the Ubuntu (OFF, OFF) failing workflow - libpng seems to be looking for some zlib functions.
  https://github.com/isl-org/Open3D/actions/runs/11466322539/job/31906749596?pr=7022