[PROJ] PROJ 6.0.0RC3

[Even Rouault]

> (The machine also has gcc 6 installed, in a different prefix, but no older
> versions.)
> 
> I would hope that proj builds ok with gcc 4.8; haven't tried yet.

It does.

> 
> > If that's indeed the only file to fail compilation, I'd suggest you try
> > tweaking the start of the file to comment out the #define _XOPEN_SOURCE
> > 500
> > and/or #define _GNU_SOURCE
> 
> That was the only one.  It makes sense then that the --std flag is not
> the issue.  Thanks for those hints - I had forgotten about
> _XOPEN_SOURCE, but now that I remember about definition visibility
> controls it sounds promising.
> 
> 
> 
> Has anyone built proj 6 with clang?  Any success reports from other than
> Linux?

It is built on different number of configurations in
https://travis-ci.com/OSGeo/proj.4/
and
https://travis-ci.com/OSGeo/gdal

Including clang and macosx

Windows Visual Studio builds also per
https://ci.appveyor.com/project/OSGeo/proj-4/history

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