gdal: prepare to migrate driver variants to subports; add gdal-pdf and gdal-libkml

[nilason]

Description

• Prepare Portfile to migrate gdal driver variants to subports
• new gdal-pdf port
• new gdal-libkml port

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 14.5 23F79 arm64
Xcode 15.4 15F31d

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint --nitpick?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[macportsbot]

Notifying maintainers:
@Veence for port gdal.

[barracuda156]

@nilason Could we also fix this one? https://trac.macports.org/ticket/70295

[Dave-Allured]

There are now four open PR's for GDAL. Upstream just announced version 3.9.1, which includes significant compile fixes and plugin changes. I submitted #24691 for the update.

Because of the plugin changes, I recommend further subport efforts should work off of 3.9.1 rather than 3.9.0. If it makes it easier to merge the 3.9.1 update into this or any other PR, that is fine with me. I would cancel #24691 in that case. I am glad others are working hard to improve the GDAL port.

[nilason]

For the rest of this week I can’t work on this, the update is good though (I tested the RC2).

[barracuda156]

@nilason Now since the update is killed, we should ensure to borrow a commit with a fix for Arrow variant from there.

UPD. And more importantly, armadillo issue fix.

[Dave-Allured]

Update to 3.9.1 is now in process on new PR #24707. Armadillo fix is included.

Arrow/libatomic fix is NOT included and must be independent. See followup discussion on #24690, #24695.

[barracuda156]

Arrow/libatomic will be done separately, and it will not require any revbumping, so it can be merged to whichever version GDAL has at the moment.

[nilason]

Added a change of libkml's boost dependency type to PG default (lib), which was necessary to enable build of gdal-libkml.

This is now ready for review.

[pmetzger]

What should be done with this at this point? Should it be committed?

[nilason]

What should be done with this at this point? Should it be committed?

From my side this is ready for merge, please go ahead.

[barracuda156]

@nilason There is a problem with libkml now due to a conflict of minizip port and its bundled copy also used by the build: https://trac.macports.org/ticket/70349