[Bug math/33393] fsqrt() not alter errno

[tydeman.fred at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=33393

--- Comment #2 from Fred Tydeman <tydeman.fred at gmail dot com> ---
C23 says that setting errno on underflow is implementation defined.  So, where
would I find that implementation documentation?

I prefer that when errors happen, they be required to be notified via both FP
flags and errno (but that is not required here by C23).

Since glibc is not consistent on setting errno on errors, remove MATH_ERRNO
from math_errhandling would be OK.

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