DOC: Add release note about clang floating point error flag change

numpy · May 20, 2021 · a303b33 · a303b33
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diff --git a/doc/release/upcoming_changes/19049.compatibility.rst b/doc/release/upcoming_changes/19049.compatibility.rst
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+Distutils forces strict floating point model on clang
+-----------------------------------------------------
+NumPy distutils will now always add the ``-ffp-exception-behavior=strict``
+compiler flag when compiling with clang.  Clang defaults to a non-strict
+version, which allows the compiler to generate code that does not set
+floating point warnings/errors correctly.