Andres Freund <andres@anarazel.de> writes:
> Unfortunately it turns out that our CFLAG configure tests don't reliably
> work with -Wold-style-definition. The problem is that the generated
> program contains 'int main() {...}', which obviously is an old-style
> definition. Which then causes a warning, which in turn causes the cflag
> tests to fail because we run them with ac_c_werror_flag=yes.
Ugh. I suspect main() might not be the only problem, either.
> Upstream autoconf has fixed this in 2014 (1717921a), but since they've
> not bothered to release since then...
I wonder if there's any way to light a fire under them.
> The easiest way that I can see to deal with that is to simply redefine
> the relevant autoconf macro. For me that solves the vast majority of
> these bleats in config.log. That's not particularly pretty, but we have
> precedent for it... Since it's just 16 lines, I think we can live with
> that?
I don't really think that -Wold-style-definition is worth that.
regards, tom lane