docs: note C++ compiler requirement in changelog fragment

guru-desh · guru-desh · commit de2bd23cd679 · 2026-07-13T23:08:38.000-07:00
The vendored kmeans1d is JIT-compiled via torch.utils.cpp_extension,
which needs a C++ toolchain on the host at runtime; previously this
requirement rode in transitively via the coremltools wheel, so it's
worth calling out now that coremltools is optional.
diff --git a/changelog.d/31.changed b/changelog.d/31.changed
@@ -1 +1 @@
-Replace the coremltools-based 1D k-means used by palettization with a vendored C++ core (copied byte-for-byte from coremltools) that is JIT-compiled at runtime via `torch.utils.cpp_extension`. `coremltools` is no longer a runtime dependency (it is now an optional dependency, installable via the `coreml` extra).
+Replace the coremltools-based 1D k-means used by palettization with a vendored C++ core (copied byte-for-byte from coremltools) that is JIT-compiled at runtime via `torch.utils.cpp_extension`. `coremltools` is no longer a runtime dependency (it is now an optional dependency, installable via the `coreml` extra). This requires a C++ compiler to be available on the host at runtime.

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		-Replace the coremltools-based 1D k-means used by palettization with a vendored C++ core (copied byte-for-byte from coremltools) that is JIT-compiled at runtime via `torch.utils.cpp_extension`. `coremltools` is no longer a runtime dependency (it is now an optional dependency, installable via the `coreml` extra).
	`1`	+Replace the coremltools-based 1D k-means used by palettization with a vendored C++ core (copied byte-for-byte from coremltools) that is JIT-compiled at runtime via `torch.utils.cpp_extension`. `coremltools` is no longer a runtime dependency (it is now an optional dependency, installable via the `coreml` extra). This requires a C++ compiler to be available on the host at runtime.