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Recommend `--config-cache` for `./configure` by johnslavik · Pull Request #1794 · python/devguide · GitHub

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Recommend --config-cache for ./configure #1794

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Merged
willingc merged 7 commits into from
Apr 25, 2026
Conversation 15 Commits 7 Checks 2 Files changed
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Recommend --config-cache for ./configure #1794

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30a3410
gh-1547: Recommend --config-cache for configure
johnslavik Apr 22, 2026
05ad04c
gh-1547: Also mention --cache-file=config.cache alias
johnslavik Apr 22, 2026
69463e6
gh-1547: Remove --config-cache from platform-specific configure commands
johnslavik Apr 22, 2026
7e8285f
gh-1547: Restructure --config-cache as optional speedup tip
johnslavik Apr 22, 2026
f9a2af1
gh-1547: Use tip admonition for --config-cache
johnslavik Apr 22, 2026
091f2fc
gh-1547: Add --config-cache to macOS platform-specific configure comm…
johnslavik Apr 22, 2026
a828b9b
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johnslavik Apr 24, 2026
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21 changes: 17 additions & 4 deletions getting-started/setup-building.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -197,6 +197,15 @@ Configuration is typically::
More flags are available to ``configure``, but this is the minimum you should
do to get a pydebug build of CPython.

.. tip::
To speed up repeated ``configure`` runs, use ``--config-cache`` (equivalent to ``--cache-file=config.cache``, short: ``-C``)::

$ ./configure --config-cache --with-pydebug

This caches results in a :file:`config.cache` file. If you switch compilers or
significantly change your build environment, delete :file:`config.cache` before
re-running ``configure``.

.. note::
You might need to run ``make clean`` before or after re-running ``configure``
in a particular build directory.
Expand Down Expand Up @@ -864,7 +873,8 @@ 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 \
./configure --config-cache \
--with-pydebug \
--with-openssl="$(brew --prefix openssl@3)"

.. tab:: Python 3.10
Expand All @@ -873,7 +883,8 @@ some of CPython's modules (for example, ``zlib``).

$ CPPFLAGS="-I$(brew --prefix gdbm)/include -I$(brew --prefix xz)/include" \
LDFLAGS="-L$(brew --prefix gdbm)/lib -L$(brew --prefix xz)/lib" \
./configure --with-pydebug \
./configure --config-cache \
--with-pydebug \
--with-openssl="$(brew --prefix openssl@3)" \
--with-tcltk-libs="$(pkg-config --libs tcl tk)" \
--with-tcltk-includes="$(pkg-config --cflags tcl tk)" \
Expand All @@ -895,7 +906,8 @@ some of CPython's modules (for example, ``zlib``).

$ GDBM_CFLAGS="-I$(dirname $(dirname $(which port)))/include" \
GDBM_LIBS="-L$(dirname $(dirname $(which port)))/lib -lgdbm" \
./configure --with-pydebug \
./configure --config-cache \
--with-pydebug \
--with-system-libmpdec

.. tab:: Python 3.11-3.12
Expand All @@ -904,7 +916,8 @@ some of CPython's modules (for example, ``zlib``).

$ GDBM_CFLAGS="-I$(dirname $(dirname $(which port)))/include" \
GDBM_LIBS="-L$(dirname $(dirname $(which port)))/lib -lgdbm" \
./configure --with-pydebug
./configure --config-cache \
--with-pydebug

And finally, run ``make``::

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4 changes: 2 additions & 2 deletions index.rst
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Expand Up @@ -43,13 +43,13 @@ instructions please see the :ref:`setup guide <setup>`.

.. code-block:: shell

./configure --with-pydebug && make -j $(nproc)
./configure --config-cache --with-pydebug && make -j $(nproc)

.. tab:: macOS

.. code-block:: shell

./configure --with-pydebug && make -j8
./configure --config-cache --with-pydebug && make -j8

.. tab:: Windows

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