[Bug 224669] [exp-run] Against projects/clang600-import branch

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224669

--- Comment #12 from Dimitry Andric <dim at FreeBSD.org> ---
(In reply to Dimitry Andric from comment #11)
...
> Hmm I think that is actually a bit weird.  I would have expected this
> warning to always fire, but apparently not.  I have not yet been able to
> find where this exactly changed between clang 5 and 6.

And obviously this changed when the default C++ mode went from gnu++98 to
gnu++14.  Apparently, for c++98 and gnu++98, it does *not* warn about pointer
== 0, since under this mode, 0 is implicitly promoted to NULL.

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