cygwin64: Issue with sigaddset

[Richard Elberger <rich at richelberger dot com>]

Hello,

I found this while trying to compile perl 5.20.1 on latest cygwin64 (just updated yesterday).

Effectively, sigaddset is adding a signal along these lines.  If signal x is less than 32, then two signals are added: x and x+32.  If signal x is greater than 32, then again two signals are added, x and x-32.

Itâs been far too many years since Iâve written C but the attached code snippet to prove it (hopefully it proves it) â and running the same âcodeâ (I put that in quotes because itâs like preschool C) on any Linux works as expected - just adding the one signal.

This is causing the sigset.t test for the POSIX module in perl core to fail.  There are a ton of other failures in testing 5.20.1 core but hopefully theyâre not all cygwin related like this one.

thanks

â rich

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