Metal Shading Language is C++14, so .metal files are classified as code and routed
through the existing C++ extractor, mirroring the CUDA .cu/.cuh reuse. Also adds
.cu/.cuh/.metal to build.py's _LANG_FAMILY map (they were all missing), so the
cross-language phantom-`calls`-edge filter treats them as C++. README language
table updated.
Ported from PR #1480 by @jiangyq9. This supersedes the earlier #1450 by
@GoodOlClint (same .metal -> C++ approach and fixture) — credit to @GoodOlClint
for the original; #1480 additionally closes the CUDA family-map gap and updates
the docs, and merges clean against current v8.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jiangyq9
652ba42e61