Re: [gentoo-dev] Getting proper USE_EXPAND variable(s) for multilib

[Alexis Ballier]

On Wed, 23 Jan 2013 21:36:22 +0400
Alexey Shvetsov <alexxy@g.o> wrote:

> В письме от 23 января 2013 08:03:56 пользователь Alexis Ballier
> написал:
> > On Wed, 23 Jan 2013 09:24:26 +0100
> >
> > Michał Górny <mgorny@g.o> wrote:
> > > On Mon, 21 Jan 2013 10:27:30 -0300
> > >
> > > Alexis Ballier <aballier@g.o> wrote:
> > > > > To be honest, I don't know if there's other way to hide USE
> > > > > flags than using USE_EXPAND_HIDDEN. If we want to use that,
> > > > > we'd have
> > > > >
> > > > > to split the flags per-arch, i.e. have:
> > > > >   MULTILIB_AMD64="abi1 abi2 abi3"
> > > > >   MULTILIB_PPC64="abi1 abi2 abi3"
> > > > >
> > > > > with appropriate USE_EXPAND_HIDDEN set by profiles.
> > > >
> > > > I don't like that at all.
> > > > I'd go for ABI= the union of all the MULTILIB_ABIS variables (if
> > > > there is no name collision)
> > > > we certainly want skype to depend on libitneeds[abi_x86], not
> > > > 'amd64? ( libitneeds[abi_amd64_x86] ) x86? ( libitneeds )'
> > >
> > > Just a quick idea.
> > >
> > > How would you feel about abi_x86_32? (similarly _64, _x32)
> > >
> > > That would be almost natural names with the trick variable being
> > > ABI_X86, therefore having all the fore-mentioned advantages.
> > >
> > > The deps would look like:
> > >   libitneeds[abi_x86_32]
> >
> > Sounds good too, I just would want it to be shared between arches
> > that can: amd64/x86/x32, ppc/ppc64, mips, sparc32/sparc64, etc.
> > You mean you will hide ABI_X86 USE_EXPAND on non-x86 arches, right ?
> > This would have all the benefits I think, very good idea :)
> >
> > Alexis.
>
> Shared abi names are bad idea. For example
> mips abis :
> o32
> n32
> n64
> eabi
> x86:
> x86_32
> x86_x32
> x86_64
>
> Actualy first three one are equivalent in their internal behavior.
> But i dont think that its good idea to have one name for all.

Sorry, I don't get it. What was meant here was one USE_EXPAND variable
per group of similar arches. Different abis are, of course,
distinguished within each variable.

> Think
> about multiarch installs where you can have binaries from different
> architectures in one system.

It depends what we want through multilib. I personally think multiarch
is out of scope: there is crossdev for that.

Alexis.