Re: erroneous behavior in 2-style USE dependencies?

On 6/16/20 9:31 PM, Zac Medico wrote:
> On 6/16/20 11:07 PM, Michael Lienhardt wrote:
>> I'm sorry, my client didn't allow to send plain text email anymore...
>> 
>> So, here is my original email.
>> 
>> Dear all,
>> 
>> My bad for not noticing it sooner, but when there is a dependency like ">=sys-fs/udev-208-r1:0/0[static-libs?]" (that occurs in virtual/libgudev-215-r3),
>>  since 'static-libs' is not a use flags of sys-fs/udev-242, that cpv is silently not considered during dependency solving by emerge.
>> However, the PMS states:
>>  - 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
>>  - For EAPIs listed in table 5.4 as not supporting profile defined IUSE injection, IUSE_REFERENCEABLE is equal to the calculated IUSE value. For EAPIs where profile defined IUSE injection is supported, IUSE_REFERENCEABLE is equal to IUSE_EFFECTIVE
>> And 'static-libs' is not in the IUSE_EFFECTIVE of sys-fs/udev-242 (that ebuild has EAPI=6).
>> So it seems to me that this current behavior of emerge should be considered an error, no? Or the PMS should be updated?
>> 
>> This is related to the tool I'm working on: should my tool allow this behavior, or fail like it is currently doing (I guess the former)?

> It's valid as a 4-style dependency with use-dep-defaults.

I know. Except that in virtual/libgudev-215-r3.ebuild we have in the DEPEND:
 >=sys-fs/udev-208-r1:0/0[${MULTILIB_USEDEP},gudev(-),introspection(-)?,static-libs?]
It is a 2-style dependency (following the PMS).

I checked with 3 dummy packages

1. app-misc/dummy-master-1
EAPI=6
SLOT=0
KEYWORDS="amd64"
IUSE="static-libs"
DEPEND=">=app-misc/dummy-slave-1[static-libs?]"
#DEPEND="=app-misc/dummy-slave-1[static-libs?]"

2. app-misc/dummy-slave-1
EAPI=6
SLOT=0
KEYWORDS="amd64"
IUSE=""
DEPEND=""

3. app-misc/dummy-slave-2
EAPI=6
SLOT=0
KEYWORDS="amd64"
IUSE="static-libs"
DEPEND=""

With the first version of DEPEND, emerge succeed:
# emerge -pv app-misc/dummy-master

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  N     ] app-misc/dummy-slave-2::gentoo  USE="-static-libs" 0 KiB
[ebuild  N     ] app-misc/dummy-master-1::gentoo  USE="-static-libs" 0 KiB


With the second version of DEPEND, emerge fails:
# emerge -pv app-misc/dummy-master

These are the packages that would be merged, in order:

Calculating dependencies... done!

emerge: there are no ebuilds built with USE flags to satisfy "=app-misc/dummy-slave-1[static-libs?]".
!!! One of the following packages is required to complete your request:
- app-misc/dummy-slave-1::gentoo (Missing IUSE: static-libs)
(dependency required by "app-misc/dummy-master-1::gentoo" [ebuild])
(dependency required by "app-misc/dummy-master" [argument])



Michael