chore(fs): build kqueue instead of fsevents watcher on iOS (#9950)

### Purpose

On iOS, the FSEvents API for watching files (also used on macOS) is not
available, but `kqueue` is. This PR ensures `kqueue` support is built on
iOS instead of the FSEvents based watcher implementation.

Before this PR, you could already use the `kqueue` build option to force
its usage. Unfortunately `gomobile`, the tool that I use to build
Syncthing for iOS and macOS for Synctrain, does not support setting
different build flags for iOS and macOS (unless I build separately for
each, which is a bit of a hassle because XCode nonsense). I am assuming
there are good reasons to support FSEvents even though `kqueue` is also
available on macOS (but I'm not sure why?). I do know FSEvents has been
working fine for me on macOS so it seems best to use FSEvents on macOS
and kqueue on iOS.

Note that this also requires https://github.com/syncthing/notify/pull/4
to be merged in `synchting/notify` (until that is done, this PR will
fail to build on iOS due to `notify` still trying to link to `fsevents`
stuff when the `kqueue` build flag is not set).

### Testing

I compiled both `syncthing/notify` and syncthing with this PR applied,
and used that to successfully build the Synctrain iOS app, which after
this PR works fine and should follow up file changes a bit quicker.

### Screenshots

n/a

### Documentation

n/a

## Authorship

Your name and email will be added automatically to the AUTHORS file
based on the commit metadata.

---------

Co-authored-by: Jakob Borg <jakob@kastelo.net>

This commit is contained in:

Tommy van der Vorst

2025-02-07 15:40:53 +00:00

committed by

GitHub

co-authored by

Jakob Borg

parent 87c16c6cf5

commit 28f0cffdb6

6 changed files with 10 additions and 11 deletions

									
										go.mod
									
		+1
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				@@ -32,7 +32,7 @@ require (

					github.com/rabbitmq/amqp091-go v1.10.0

					github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475

					github.com/shirou/gopsutil/v4 v4.25.1

					github.com/syncthing/notify v0.0.0-20210616190510-c6b7342338d2

					github.com/syncthing/notify v0.0.0-20250207082249-f0fa8f99c2bc

					github.com/syndtr/goleveldb v1.0.1-0.20220721030215-126854af5e6d

					github.com/thejerf/suture/v4 v4.0.6

					github.com/urfave/cli v1.22.16