[swift-evolution] [DRAFT] Introducing a Debug Build Configuration Test

[Dmitri Gribenko]

On Mon, Mar 14, 2016 at 11:57 AM, Erica Sadun via swift-evolution
<swift-evolution at swift.org> wrote:
> https://gist.github.com/erica/d20639b409fe1b318c0e
>
> Feedback solicited. Thanks, -- Erica
>
> Introducing a Debug Build Configuration Test
>
> Proposal: SE-00XX
> Author(s): Erica Sadun
> Status: TBD
> Review manager: TBD
>
> Introduction
>
> This proposal introduces a configuration test for debug builds.
>
> This proposal was discussed on-list in the Introducing a Debug Build
> Configuration Test thread.
>
> Motivation
>
> Developers are used to including code specific to debug builds in their
> projects. Having a debug configuration test is an industry standard option.
> Under the current version of Swift you must add a command-line flag using -D
> <#flag#> (e.g. -D debug) and test in-code (#if debug), there's no consistent
> system-supplied way to differentiate code meant only for debug builds.
>
> Detail Design
>
> This proposal adds #if config(debug) to test for debug builds.
>
> #if config(debug)
>     // code for debug builds only
> #endif

Hi Erica,

Based on Joe's rationale that you are quoting, I think the intent is
that we want to restrict this directive to be statement-level only.
The API vended by a module should not be affected by the build mode.

Dmitri

-- 
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/