> Beman Dawes said:

[...]

> > The idea of mandatory "options" is new to me. Wonders never cease.

Actually the idea isn't that new. An example of a mandatory C++ option is,
for example, function template partial ordering. The compilers have to
support it in theory, but in practice some don't, and
BOOST_NO_FUNCTION_TEMPLATE_ORDERING is the macro that indicates (absence of)
support.

I guess the POSIX mandatory options are similar in spirit, i.e. something
expected to go away as implementations catch up.

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