gh-115119: defer removal of bundled libmpdec to 3.16

[skirpichev]

• Issue: Unvendor libmpdec sources #115119

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📚 Documentation preview 📚: https://cpython-previews--133997.org.readthedocs.build/

[skirpichev]

Oops, this seems to be not just a docs patch. I hope this still ok for backport.

[picnixz]

I don't have much to say but I'm neutral on delaying the removal.

[vstinner]

defer removal of bundled libmpdec to 3.16

What is the rationale for defering the removal?

[skirpichev]

What is the rationale for defering the removal?

You can see the issue thread.

For my humble opinion the only excuse is that we miss removal of the implicit fallback to bundled copy (now #134078) in 3.14. (Though, this wasn't announced somewhere else.) We also miss libmpdec in latest ubuntu images. (I think this will be solved before 3.14 release.)

[AA-Turner]

For my humble opinion the only excuse is that we miss removal of the implicit fallback to bundled copy

I still think we can stick to the original plan (that is: remove the vendored copy in 3.15). The only issue to solve is installing development sources on Ubuntu for 24.04.

[skirpichev]

FYI, I restored removal PR: #133964. I think libmpdec can be installed from PPA for PHP.

[vstinner]

LGTM

[skirpichev]

This, probably, requires approval from the release manager. Though, @hugovk removed request for review.

[vstinner]

This, probably, requires approval from the release manager. Though, @hugovk removed request for review.

Deferring a breaking change is always a good thing :-)

[hugovk]

An RM decision isn't needed for normal feature changes in main aka 3.15. (And if it's deferred to 3.16, it's even less of this RM's decision :)

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skirpichev commented Jun 11, 2025

Deferring a breaking change is always a good thing :-) Maybe. An RM decision isn't needed for normal feature changes in main aka 3.15. This affects 3.14 as well, as we change announced plans.

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vstinner vstinner approved these changes

StanFromIreland StanFromIreland approved these changes

AA-Turner Awaiting requested review from AA-Turner

erlend-aasland Awaiting requested review from erlend-aasland erlend-aasland is a code owner

corona10 Awaiting requested review from corona10 corona10 is a code owner

picnixz Awaiting requested review from picnixz

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[skirpichev]

Deferring a breaking change is always a good thing :-)

Maybe.

An RM decision isn't needed for normal feature changes in main aka 3.15.

This affects 3.14 as well, as we change announced plans.