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gh-128042: Update docs to not use CFLAGS=-O0 with --enable-optimizations #137651

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gh-128042: Update docs to not use CFLAGS=-O0 with --enable-optimizations #137651

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4 changes: 4 additions & 0 deletions Doc/using/configure.rst
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Expand Up @@ -552,6 +552,10 @@ also be used to improve performance.
GCC is used: add ``-fno-semantic-interposition`` to the compiler and linker
flags.

Do not set ``-O0`` in :envvar:`CFLAGS` when using this option, as it doesn't
make sense to perform Profile Guided Optimization when no optimizations are
enabled.

.. note::

During the build, you may encounter compiler warnings about
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