The way I look at it is that Swift wants all symbols resolved when linking. C++ is probably very lenient toward full resolution, and as long as you know that a certain unresolved reference is not used, you can safely ignore the warning. Or maybe the C++ compiler is just very clever and can figure out that the reference is never used?
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 18:09, Jakub Bednář <jakub.bed...@avast.com> wrote: > > 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 <r...@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 <r...@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@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@swift.org >>>> https://lists.swift.org/mailman/listinfo/swift-users >>> >> > _______________________________________________ swift-users mailing list swift-users@swift.org https://lists.swift.org/mailman/listinfo/swift-users
