ioquake3: Switch to CMake for building

[marshall-lee]

ioquake3 Makefile is gonna be deprecated by November 6, 2025.

See:

• Warn users that the Makefile is now deprecated ioquake/ioq3#750
• ioquake/ioq3@2c893f2

[cmitu]

@marshall-lee thank you for the PR. I tested it and seems to work fine, using cmake simplifies things a bit. The only issue at this moment is the support for our current Pi images, which uses the old RaspoOS 10 'buster' release and which doesn't have the required pi version.

[marshall-lee]

@cmitu

Thanks for testing it. So how can I help with older images in the context of this PR?

[cmitu]

I can see 2 methods - either relaxing the cmake requirement in the CMakeLists.txt file or downloding a temporary cmake kit in $md_inst to be used during building.

EDIT: it seems the 1st method won't work, cmake needs a newer version than the one shipped by RaspiOS 10 (3.16).

[joolswills]

We could use an older version of ioquake3 for systems with a version of cmake that is too old, but would need some additional build logic. Perhaps setting I_ACKNOWLEDGE_THE_MAKEFILE_IS_DEPRECATED=1 and using the last version that works with that option. That option could be set now as a quick workaround also I guess to fix building (Until the Makefile is removed or it doesn't work)

[marshall-lee]

We could use an older version of ioquake3 for systems with a version of cmake that is too old, but would need some additional build logic. Perhaps setting I_ACKNOWLEDGE_THE_MAKEFILE_IS_DEPRECATED=1 and using the last version that works with that option. That option could be set now as a quick workaround also I guess to fix building (Until the Makefile is removed or it doesn't work)

Ok I'll try to add such logic

[marshall-lee]

So Makefile was actually removed in ioquake/ioq3@76043c7

[marshall-lee]

In my commit e91175a I attempted to implement @joolswills proposal about locking the git revision of ioquake3 for older systems (Buster and Bullseye). On these systems Makefile is still used but on Bookworm and newer ioquake3 gets built using cmake.

[cmitu]

Looks ok, tested on recent Trixie.

[cmitu]

@marshall-lee thank you for the PR !