Re: [gentoo-user] [gentoo-user] Why IDEPEND's context is BHOST?

[Ionen Wolkens <ionen@gentoo.org>]

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On Thu, Sep 01, 2022 at 05:26:46PM +0300, Alexander Kurakin wrote:
> 
> Good day!
>  
> [1] says:
>  
> >  idepend Additionally, in EAPIs listed in table 8.4 as supporting IDEPEND, install-time dependencies can be specified. These dependencies are binary compatible with the native build system (CBUILD).
>  
> But we install and use (run at install-time) dependencies on host system (CHOST), don’t we? Why CBUILD is mentioned above, instead?

If cross-building to a different ROOT, e.g. amd64 CBUILD to a aarch64
CHOST, then amd64 will need deps to run pkg_postinst from its arch
(which IDEPEND will provide).

Of course, aarch64 will /also/ need these deps so it can emerge or
unmerge a binpkg, also provided by IDEPEND.

Before EAPI8 the best you could do to represent this was to have
the dependency in both RDEPEND and BDEPEND, but this lack a use-case
where you cross-emerge a binpkg given it won't pull BDEPEND (not
building) and then RDEPEND is for the wrong arch.

-- 
ionen

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