Bug 659700 – Dependency foo[bar?,baz?] seems not working if baz is not in IUSE of foo

• Product: Gentoo Linux
• Status: RESOLVED INVALID

[Description Tupone Alfredo 2018-06-30 19:49:42 UTC]

In dev-ada/xmlada I had to do:
-	dev-ada/gprbuild[gnat_2016=,gnat_2017=,gnat_2018=]
+	dev-ada/gprbuild[gnat_2016?]
+	dev-ada/gprbuild[gnat_2017?]
+	dev-ada/gprbuild[gnat_2018?]
with gnat_2016 !gnat_2017 !gnat_2018 and without doing this change emerge asked me to use the only dev-ada/gprbuild that has in the IUSE gnat_2018 (dev-ada/gprbuild-2018)

Reproducible: Always

[Comment 1 Zac Medico 2018-07-01 09:32:51 UTC]

This is the intended behavior, you need to use (+) or (-) to indicate whether missing IUSE should behave if if the flag is enabled or disabled. For example, this would indicate that the flag should be considered disabled for packages that have missing IUSE:

dev-ada/gprbuild[gnat_2016(-)?]
dev-ada/gprbuild[gnat_2017(-)?]
dev-ada/gprbuild[gnat_2018(-)?]

This is referred to as use-dep-defaults in PMS:

https://dev.gentoo.org/~ulm/pms/head/pms.html#x1-790008.2.6.4

[Comment 2 Tupone Alfredo 2018-07-01 18:09:49 UTC]

Thanks for pointing to that part of the document.

That hopefully solve my problem.

But why

DEPEND="dev-ada/gprbuild[gnat_2016?,gnat_2017?,gnat_2018?]"

is different from 

DEPEND="dev-ada/gprbuild[gnat_2016?] dev-ada/gprbuild[gnat_2017?] dev-ada/gprbuild[gnat_2018?]"

It should be the same if I understand correctly but it was the way I previously found to solve it

[Comment 3 Zac Medico 2018-07-01 18:21:16 UTC]

For DEPEND="dev-ada/gprbuild[gnat_2016?,gnat_2017?,gnat_2018?]" it will not match unless all of the specified use-deps match, but of course you can use (+) and (-) use-dep-defaults to change that.

The DEPEND="dev-ada/gprbuild[gnat_2016?] dev-ada/gprbuild[gnat_2017?] dev-ada/gprbuild[gnat_2018?]" thing is clever, and is equivalent to (-) use-dep-defaults.

[Comment 4 Tupone Alfredo 2018-07-01 19:38:08 UTC]

++