Geometry Boost List: [ggl] Re: problems with Boost Geometry Xcode compile?

Subject: [ggl] Re: problems with Boost Geometry Xcode compile?
From: Mateusz Loskot (mateusz)
Date: 2010-03-09 15:40:01

Mark McCann wrote:
> OK. So I figured out that there must be a macro in the wxWidgets library for
> the symbol "check."  I know this since writing:
> #ifdef check
> #undef check
> #endif
> #include <boost/geometry/geometry.hpp>
> 
> fixed the issue.

Good catch!

> I don't think this in my code specifically because I tried
> it in two different wx projects. Anybody know how to track down exactly
> where a macro is defined?

You may preprocess only your .cpp file and scan output for the macro
and you will find context where it is defined. For instance:

$ g++ -E test.cpp

> If this is a problem in wxWidgets, then this
> might impact a lot of potential C++ projects that use Boost.Geometry.

That's another good example of why macros are evil, especially
if defined using extremely non-unique name.

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org