The CamelCase-to-hyphenated conversion was incorrectly splitting
"OpenMP" and "OpenACC" into "open-mp" and "open-acc", producing wrong -W
flag names like -Wopen-mp-usage instead of -Wopenmp-usage. Fix the
conversion to treat these as compound names, keep the old spellings as
deprecated aliases, and emit a warning when deprecated spellings are
used.
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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