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[3.11] gh-90539: doc: Expand on what should not go into CFLAGS, LDFLAGS (GH-92754) #94029

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Jun 20, 2022
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[3.11] gh-90539: doc: Expand on what should not go into CFLAGS, LDFLAGS (GH-92754) #94029

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18 changes: 18 additions & 0 deletions Doc/using/configure.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -748,6 +748,17 @@ Compiler flags
extensions. Use it when a compiler flag should *not* be part of the
distutils :envvar:`CFLAGS` once Python is installed (:issue:`21121`).

In particular, :envvar:`CFLAGS` should not contain:

* the compiler flag `-I` (for setting the search path for include files).
The `-I` flags are processed from left to right, and any flags in
:envvar:`CFLAGS` would take precedence over user- and package-supplied `-I`
flags.

* hardening flags such as `-Werror` because distributions cannot control
whether packages installed by users conform to such heightened
standards.

.. versionadded:: 3.5

.. envvar:: EXTRA_CFLAGS
Expand Down Expand Up @@ -860,6 +871,13 @@ Linker flags
:envvar:`CFLAGS_NODIST`. Use it when a linker flag should *not* be part of
the distutils :envvar:`LDFLAGS` once Python is installed (:issue:`35257`).

In particular, :envvar:`LDFLAGS` should not contain:

* the compiler flag `-L` (for setting the search path for libraries).
The `-L` flags are processed from left to right, and any flags in
:envvar:`LDFLAGS` would take precedence over user- and package-supplied `-L`
flags.

.. envvar:: CONFIGURE_LDFLAGS_NODIST

Value of :envvar:`LDFLAGS_NODIST` variable passed to the ``./configure``
Expand Down