[swift-users] Where did “powl” go?

[James Campbell]

It seems like Swift has broken a lot of the export functionality. Some of
the exporting system was actually a bug but resulting in useful
functionality (i.e like importing C Macros as enums). But once fixed we
lost a lot of it.

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On 6 July 2016 at 07:23, Antonino Ficarra via swift-users <
swift-users at swift.org> wrote:

> long double math.h functions appear to not be exported in swift. I don’t
> know why.
>
> This horrible hack works:
>
> // in f80.h
> extern void sqrt_f80( void *result, const void *v );
> extern void pow_f80( void *result, const void *v, const void *e );
> ...
>
> // in f80.c
> void sqrt_f80( void *result, const void *v ) { *(long double *)result =
> sqrtl( *(const long double *)v ); }
> void pow_f80( void *result, const void *v, const void *e ) { *(long double *)result
> = powl( *(const long double *)v,*(const long double *)e ); }
> …
>
> // in f80.swift
> func sqrt( _ a:Float80 ) -> Float80 { var result = Float80(); var v = a;
> sqrt_f80( &result, &v ); return result; }
> func pow( _ a:Float80,_ e:Float80 ) -> Float80 { var result = Float80();
> var v1 = a; var v2 = e; pow_f80( &result, &v1, &v2 ); return result; }
> …
>
> Sorry for my bad english.
>
>
> Il giorno 05 lug 2016, alle ore 19:44, Jeff Kelley via swift-users <
> swift-users at swift.org> ha scritto:
>
> Hello all,
>
> I’m using Xcode 8.0 and Swift 3 on OS X 10.11, and I’m trying to use powl
> in an OS X Playground. I see the definition of the pow-related functions
> in math.h here:
>
> extern float powf(float, float);
> extern double pow(double, double);
> extern long double powl(long double, long double);
>
> But the Swift-imported version at Darwin.C.math looks like this:
>
> public func powf(_: Float, _: Float) -> Float
> public func pow(_: Double, _: Double) -> Double
>
> Where did powl go?
>
>
> Jeff Kelley
>
> SlaunchaMan at gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> |
> jeffkelley.org
>
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