Project export for iOS takes a very long time (10+ min) due to LTO enabled in 3.2.4 RC 2

[oeleo1]

Godot version:

3.2.4 rc2

OS/device including version:

iOS Catalina

Issue description:

iOS project export freezes (repeatedly) on Making .xcarchive at 60%. Tried the standard demo Dodge The Creeps - same issue with 3.2.4 rc2, freeze at 60%.

Same projects, same export has no problem with 3.2.4 rc1 and previous versions.

Steps to reproduce:
Export project for iOS with 3.2.4. rc2

Minimal reproduction project:

No clue where to look at but willing to help debugging it.

[akien-mga]

CC @godotengine/ios

[naithar]

Seeing same issue with 3.2.4rc2 on my project.
Trying to compile directly with Xcode seems to have no effect. Xcode is stuck on Link Godot.
@akien-mga was iOS templates built with LTO support? The last time I got same results was exactly because of this.

@oeleo1 can you try building directly with Xcode? And if that fails can you try building iOS template yourself?

[naithar]

Yeah, use_lto (-flto) makes iOS projects noncompileable. But build script doesn't seem to have anything using this flags. production=yes also isn't used.

I've built lto and non-lto binaries myself and nonlto work fine.

[akien-mga]

Yeah I have a local commit that enabled production=yes, I forgot to push it. So I'll disable it again for iOS (and I guess we should maybe disable LTO support in the detect.py if it doesn't work?).

[naithar]

I'm not sure exact reason for it to be there, so I didn't touch when I was doing refactoring just in case. But since it's not working and just breaking stuff, I guess it should be removed.

Edit:
Oh, and I've managed to compile a project with LTO binary. But it took about 5 minutes to link device only binary.

[ViktorEvil]

same, takes up to 10 minutes to do the initial build in Xcode, stays on "Constructiing differed tasks" for ages

using M1 MacBook Pro with 16GB

[naithar]

@oeleo1 @ViktorEvil
You can download iOS binaries from here: https://s3.eu-central-1.wasabisys.com/naithar/godot/godot_templates/ios/3.2.4.b7695f1/list.html

You can simply replace <project_name>.a file in project folder with the file from archive and it should be possible to compile through Xcode without linker taking a lot of time.
In case you want to use .xcframework (to be able to test on arm64 simulator) you will need to manually link it to the Xcode project, but don't forget to set it to Do not embed and remove <project_name>.a from linked objects.

[ViktorEvil]

@naithar thanks, I noticed you have tvOS builds on there as well, is that a possible export feature in Godot 4?