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Subject: Re: [gentoo-dev] Re: ssl vs openssl vs libressl vs gnutls USE flag
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From: hasufell <hasufell@gentoo.org>
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Date: Wed, 28 Oct 2015 12:30:34 +0100
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On 10/28/2015 12:23 PM, Anthony G. Basile wrote:
> 
> A properly designed sub-USE flag would be useful here and clearly better
> than our REQUIRED_USE.  I think REQUIRED_USE is fine for heterogeneous
> cases, but not when you have something like curl where you can either
> turn ssl on or off.  If it is off, nothing more needs to be specified,
> if it is on, then you must further specify one and exactly one ssl
> provider.
> 

Uhm, curl makes use of REQUIRED_USE heavily, otherwise the use_expand
would not work:
> REQUIRED_USE="
> 	curl_ssl_winssl? ( elibc_Winnt )
> 	threads? ( !adns )
> 	ssl? (
> 		^^ (
> 			curl_ssl_axtls
> 			curl_ssl_gnutls
> 			curl_ssl_libressl
> 			curl_ssl_openssl
> 			curl_ssl_nss
> 			curl_ssl_polarssl
> 			curl_ssl_winssl
> 		)
> 	)"

With the providers syntax from exherbo, this monster would basically be
gone.