687380 – foo[bar?] should be equivalent to bar? (foo[bar]) !bar? (foo) but it is not ?

Bug 687380 - foo[bar?] should be equivalent to bar? (foo[bar]) !bar? (foo) but it is not ?

Summary: foo[bar?] should be equivalent to bar? (foo[bar]) !bar? (foo) but it is not ?

Status:	RESOLVED INVALID

Alias:	None

Product:	Gentoo Linux
Classification:	Unclassified
Component:	Current packages (show other bugs)
Hardware:	All Linux

Importance:	Normal normal (vote)
Assignee:	Portage team

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Reported:	2019-06-04 18:51 UTC by Tupone Alfredo
Modified:	2019-06-05 07:17 UTC (History)
CC List:	0 users

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Runtime testing required:	---

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Description Tupone Alfredo gentoo-dev

2019-06-04 18:51:38 UTC

The problem is raised with dev-ada/gnatcoll-core-2018-r1 depending from 
dev-ada/gprbuild[gnat_2016?,gnat_2017?]

The last version of dev-ada/gprbuild does not have the gnat_2016 flag so it is not taken into account

I changed the gnatcoll-core dependency to 

dev-ada/gprbuild
gnat_2016? ( dev-ada/gprbuild[gnat_2016] )

and in this case it is.

Reproducible: Always

Comment 1 Zac Medico gentoo-dev

2019-06-04 19:03:51 UTC

You need to use (+) or (-) if the flag is not in IUSE of the target package, see https://dev.gentoo.org/~ulm/pms/head/pms.html#x1-830008.3.4:

> Unless a 4-style default is specified, it is an error for a use dependency to
> be applied to an ebuild which does not have the flag in question in
> IUSE_REFERENCEABLE