[swift-users] How to optionally link swift framework into another framework

[Jakub Bednář]

Hi Rien,

looks like a good way around my problem.

Still I wonder why this does not work in Swift as it does work in Objective-C or even in strongly typed checked C++.

Maybe it is some kind of Swift’s security measure to avoid hard-to-debug bugs in C++ caused by virtual table inconsistencies.

Anyway, thanks for the help.

J.


> On Mar 6, 2017, at 6:01 PM, Rien <Rien at Balancingrock.nl> wrote:
> 
> Well, that was a bit short…
> 
> When you want to use logging, define the ACC “USE_LOGGING” in the build settings.
> When you don’t want to use logging, don’t define the ACC.
> 
> PS: You can get my logging framework from github: https://github.com/Balancingrock/SwifterLog
> 
> Regards,
> Rien
> 
> Site: http://balancingrock.nl
> Blog: http://swiftrien.blogspot.com
> Github: http://github.com/Balancingrock
> Project: http://swiftfire.nl
> 
> 
> 
> 
> 
>> On 06 Mar 2017, at 17:58, Rien <Rien at Balancingrock.nl> wrote:
>> 
>> You need conditional compilation.
>> 
>> Called “Active Compilation Conditions” in the build settings.
>> 
>> For example define a ACC of “USE_LOGGING”
>> 
>> Then in your code:
>> 
>> #if USE_LOGGING
>> 
>> import Logging
>> 
>> #else
>> 
>> struct Logging {
>> 	func debug(message: string) {}
>> }
>> 
>> #endif
>> 
>> 
>> 
>> 
>> Regards,
>> Rien
>> 
>> Site: http://balancingrock.nl
>> Blog: http://swiftrien.blogspot.com
>> Github: http://github.com/Balancingrock
>> Project: http://swiftfire.nl
>> 
>> 
>> 
>> 
>> 
>>> On 06 Mar 2017, at 17:26, Jakub Bednář via swift-users <swift-users at swift.org> wrote:
>>> 
>>> Hello everyone,
>>> 
>>> I am trying to add optional logging into my framework, but for sake of this question, lets assume I want to add optional logging into an app. I have created an example with following setup:
>>> 
>>> 1. Logging.framework declares
>>> 
>>> 	public protocol Logging {
>>> 		func debug(message: String)
>>> 	}
>>> 
>>> 	and I have build the framework for the app to see it.
>>> 
>>> 2. Application has 
>>> 
>>> 	import Logging
>>> 	
>>> 	public class Engine {
>>> 
>>> 		let logger: Logging?
>>> 
>>> 		public init(withLogger logger: Logging? = nil) {
>>> 			self.logger = logger 
>>> 		}
>>> 
>>> 		public work() {
>>> 			self.logger?.debug(“Working”)
>>> 		}
>>> 	} 
>>> 
>>> Now I don’t have the Logging.framework in Embed Binaries nor Link Frameworks lists. My app builds ok, but then fails to start telling me that Logging.framework was not loaded. I checked the binary using otool -L and Logging.framework is still referenced by the binary. Is there any way how to achieve my goal? This would be trivial with Objective-C and I still can’t figure it out in Swift.
>>> 
>>> Thanks a lot,
>>> 
>>> J.
>>> 
>>> _______________________________________________
>>> swift-users mailing list
>>> swift-users at swift.org
>>> https://lists.swift.org/mailman/listinfo/swift-users
>> 
>