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Add a note to not set -O0 with --enable-optimizations #1628

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Add a note to not set -O0 with --enable-optimizations #1628

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5 changes: 5 additions & 0 deletions getting-started/setup-building.rst
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Expand Up @@ -281,6 +281,11 @@ and may be used to auto-enable Link Time Optimization (LTO) on some platforms.
See :option:`python:--enable-optimizations` and :option:`python:--with-lto`
to learn more about these options.

.. important::
When using ``--enable-optimizations``, do not set ``CFLAGS=-O0`` or any other
flags that disable compiler optimizations. PGO requires optimizations to be
enabled to work properly.

.. code:: console

$ ./configure --enable-optimizations --with-lto
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