Custom TEST pre-processor macros in Swift 5

Question

In Swift, I can do:

#if DEBUG
    // code
#else
    // code
#endif

but making custom macros as described in #ifdef replacement in the Swift language answers doesn't work for me.

How am I supposed to do this for Swift 5 / Xcode 12?

Edit: My problem was that I assumed testing an application would trigger the macros in the application if I defined them in the AppTest target.

Putting -DYOURMACRO in Other Swift Flags under Swift Compiler - Custom Flags does indeed work.

The way to do what I wanted is either to put this flag in the application target whenever I want to run unit tests (really don't like this solution), or using launch arguments instead (not optimal but will do).

It works on my Xcode 12.5, what version are you really targeting? — Larme, Jul 05 '21 at 20:00

Andy Jazz · Accepted Answer · 2021-07-06T08:53:42.863

In C, Objective-C and Metal you have to use #ifdef DEBUG (Xcode 12.5):

#import <Foundation/Foundation.h>

#ifdef DEBUG
    BOOL const DEBUG_BUILD = YES;
#else
    BOOL const DEBUG_BUILD = NO;
#endif

But in Swift you have to use just the following syntax (Xcode 12.5):

import Foundation

#if DEBUG
    let debugBuild: Bool = true
#else
    let debugBuild: Bool = false
#endif

And why you said you couldn't use a custom pre-processor macros?

#if !RELEASE
    import SceneKit
#endif

func loader() {
    #if DEBUG
        SceneKit.SCNSphere.init(radius: 0.1)
    #endif
}

Custom TEST pre-processor macros in Swift 5

1 Answers1