[Bug 216864] cpow(), cpowf(), and cpowl() need better implementations

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216864

--- Comment #6 from Ed Maste <emaste at freebsd.org> ---
(In reply to Steve Kargl from comment #4)

Sorry for the snarkiness of my comment, I did not intend it to be so. Either
way the intent is genuine - I really do want to see proper implementations in
libm rather than hacks that paper over issues.

To that end, what do you think about:

a. adding comments to those files referencing this PR (or a similar PR for
other functions) and pointing out that a proper implementation is required
b. adding a link-time warning (as emitted if using e.g. gets) that the current
implementation is poor quality

Is this an accurate view of the current status:

Some sort of work in progress: ccoshl ccosl cexpl csinhl csinl
Improved implementations needed: cpow cpowf cpowl powl tgammal
No current implementation: ctanhl ctanl

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