Re: [gentoo-dev] Re: GLEP draf for cross-compile support in multilib profiles

[Thomas Sachau]

Zac Medico schrieb:
> On 07/01/2012 04:29 AM, Thomas Sachau wrote:
>> Matt Turner schrieb:
>>> On Fri, Jun 29, 2012 at 10:30 AM, Thomas Sachau <tommy@g.o> wrote:
>>>>
>>>
>>> I'm interested in this because I'm regularly annoyed with the emul-
>>> packages and also because multilib is pretty important for mips.
>>>
>>>> If a package has dependencies, then those dependencies are required to have
>>>> at least the same targets enabled as the package
>>>
>>> That seems like the obvious (but perhaps naive) choice. What about
>>> depending on packages that don't install libraries, like x11-proto/
>>> packages or generators like dev-util/indent?
>>>
>>> Maybe I just don't understand. Would these packages even have ABI flags?
>>
>> All packages do get the ABI flags (with the needed EAPI or via enabled
>> portage feature, which is currently in the multilib branch).
>>
>> If a package does not install anything ABI-specific (no headers, no libs
>> and no binaries), then there is no overhead, since it will just get
>> compiled/installed for one ABI, even if multiple ABI flags are enabled.
>
> For a package like this that does not install anything ABI-specific,
> does the package manager still execute phases for each enabled ABI, or
> is there some way for the ebuild to indicate whether or not its phases
> need to be executed for each enabled ABI?
>


This is dynamicly checked at runtime, no need to modify the ebuilds and
also no needless compilation, when there is no ABI-specific content.

A more detailed answer at package manager level:
After the src_install phase for the first requested ABI has been
finished, the content of $DESTDIR is checked. If there is no ABI
specific content, the other enabled ABIs are skipped and the following
steps are done as usual.

-- 

Thomas Sachau
Gentoo Linux Developer