[swift-users] #if DEBUG on Linux

[TUNG CK]

https://stackoverflow.com/questions/24003291/ifdef-replacement-in-the-swift-language

see the duscussion 

> Taylor Swift via swift-users <swift-users at swift.org> 
> #if DEBUG
>     print("debug")
> #endif
> 
> Doesn’t work on Linux, I think only XCode sets this. How can I conditionally include code that only runs in debug mode on Linux?
> 
> I know about `_isDebugAssertConfiguration()` but using it produces warnings when building in release mode.
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