K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2019-11-13T18:21:06.177835Z
K 7
svn:log
V 371
ssp: further refine the conditional used for constructor priority

__has_attribute(__constructor__) is a better test for clang than
defined(__clang__). Switch to it instead.

While we're already here and touching it, pfg@ nailed down when GCC actually
introduced the priority argument -- 4.3. Use that instead of our
hammer-guess of GCC >= 5 for the sake of correctness.

END