Cannot build point-release/23103 on Linux in release config. about o3de HOT 4 OPEN

Meshlets are not officially supported on O3DE, and are not available by default in the list of selected gems to enable. To get this gem to work requires quite a bit of work documented in its readme, as well as custom registration and hand-activation of it, else it wont even show up in Project Manager.

I was a able to get it to work on linux ubuntu 22.04 by manually installing the meshoptimizer-dev library from the apt repository, and then adding the dependency meshoptimizer::meshoptimizer to the meshoptimizer PUBLIC BUILD_DEPENDENCIES list of the main static module, and then adding

find_package(meshoptimizer CONFIG REQUIRED)  # use system provided library
# there is only one config shipped in the above library, called "NONE".  Map O3DE configs to it.
set_target_properties(meshoptimizer::meshoptimizer PROPERTIES MAP_IMPORTED_CONFIG_RELEASE NONE)
set_target_properties(meshoptimizer::meshoptimizer PROPERTIES MAP_IMPORTED_CONFIG_DEBUG NONE)
set_target_properties(meshoptimizer::meshoptimizer PROPERTIES MAP_IMPORTED_CONFIG_PROFILE NONE)

to the linux 3rd party package list in cmake/3rdParty/Platform/Linux/...

We should probably fixup this gem and move it to extras...

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We should just remove it from the point release then.

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The release build failed on 2310.2. It went through on 2310.1

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Well the Meshlets Gem is not part of the engine.json file, so it shouldn't be building in the first place as CMake should not be visiting the CMakeLists.txt for the Gems/Meshlets folder.

We can debug which Gems folders are being added to the build by setting the CMake log level to verbose using the --log-level vebose option when configuring.

There is VERBOSE log messages that outputs all external_subdirectories in Subdirectories.cmake

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