Segmentation fault 11 with Xcode 11.4 when building for release

[Sindre Sorhus]

Seems there's a compiler crash in the latest Swift 5.2 compiler.

I haven't yet tracked down exactly what the issue is, but it can be reproduced with simple code like:

import SwiftUI
import Grid

struct Foo: Hashable {}

struct GifsView: View {
	var body: some View {
		List([Foo()], id: \.self) { _ in
			Text("")
		}
			.gridStyle(ModularGridStyle(columns: 1, rows: 1))
	}
}

So it's definitely something in .gridStyle or GridStyle.

You can also reproduce the crash by opening the Xcode project in this repo, selecting the "GridDemo macOS" target and and then selecting the "Product => Archive" menu item.

---

I would recommend getting this project added to https://github.com/apple/swift-source-compat-suite

[James Hall]

Same, I thought it was just me. thank goodness

[Alexander Young]

@sindresorhus @imjameshall turns out with this new version of Swift and Xcode this function

func gridStyle<S>(_ style: S) -> some View where S : GridStyle

has to be inlinable

@inlinable func gridStyle<S>(_ style: S) -> some View where S : GridStyle

[Sindre Sorhus]

@ay42 Do you agree it's a Swift compiler bug? If so, I can open an issue on the Swift bug tracker.

[Alexander Young]

@sindresorhus looks like it.
I just checked in other repos and it only happens when both are true:

1. It's in a dependency (if you move this function to your project it works)
2. Argument is a protocol (if it's a struct it's fine)