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Update libmpdec-related instructions #1598

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3f00b21
Update libmpdec-related instructions
skirpichev Jul 2, 2025
857fc7c
Update getting-started/setup-building.rst
skirpichev Jul 6, 2025
891b636
Recommend system libmpdec
skirpichev Jul 6, 2025
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2 changes: 1 addition & 1 deletion getting-started/setup-building.rst
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Expand Up @@ -783,6 +783,7 @@ some of CPython's modules (for example, ``zlib``).

Note that Debian 12 and Ubuntu 24.04 do not have the ``libmpdec-dev`` package. You can safely
remove it from the install list above and the Python build will use a bundled version.
Alternatively, you can install this package from https://deb.sury.org/.
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Alternatively, you can install this package from https://deb.sury.org/.
Alternatively, you can install this package from https://deb.sury.org.

I'm not familiar with this source so will leave for someone else to review if we should recommend it.

But generally, do I get this right: For Debian 12 and Ubuntu 24.04, if users don't use a third-party package source, they'll use the fallback to the bundled copy. But we'll remove that bundled copy in Python 3.16 (branch opens May 2026, final release October 2027).

However, Ubuntu 24.04 is EOL in 2029 (and Debian 12 in June 2026). What is our recommendation to users of Ubuntu 24.04? (And later versions of Ubuntu and Debian)

And also: if the bundled fallback is already deprecated and going away in 3.16, should we be encouraging everyone to start using the replacement (an external copy) already, to help identify potential issues ahead of 3.16?

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I'm not familiar with this source so will leave for someone else to review if we should recommend it.

We use that in the CPython CI.

What is our recommendation to users of Ubuntu 24.04?

Em? Use https://deb.sury.org.

And later versions of Ubuntu and Debian

Later versions come with the libmpdec-dev.

should we be encouraging everyone to start using the replacement (an external copy) already

Yes, probably this should be rephrased.

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I think this was updated.


.. tab:: macOS

Expand Down Expand Up @@ -823,7 +824,6 @@ some of CPython's modules (for example, ``zlib``).
$ GDBM_CFLAGS="-I$(brew --prefix gdbm)/include" \
GDBM_LIBS="-L$(brew --prefix gdbm)/lib -lgdbm" \
./configure --with-pydebug \
--with-system-libmpdec \
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Confirmed builds and tests pass on macOS without this for 3.13/3.14/main.

--with-openssl="$(brew --prefix openssl@3)"

.. tab:: Python 3.11-3.12
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