[Bug 211760] graphics/Coin builds fine with clang 3.8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211760

Shane <FreeBSD at ShaneWare.Biz> changed:

           What    |Removed                     |Added
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                 CC|                            |FreeBSD at ShaneWare.Biz

--- Comment #6 from Shane <FreeBSD at ShaneWare.Biz> ---
The USE_GCC option is historic, it was used to make the port build with gcc48
instead of the base gcc4.2 which is still the base compiler on 9.3 that is
supported until December 2016.

The correct replacement for USE_GCC would now be USE=compiler:c++11-lang - see
/usr/ports/Mk/Uses/compiler.mk for available options.

As for the build failure it starts with "error: use of undeclared identifier
'NO_SINGLEPREC'" these can be found in
work/Coin-3.1.3/include/Inventor/C/base/math-undefs.h - reading the comments
there shows this as their approach to preventing the use of math functions that
take a float parameter, these functions are not used within the Coin source
code and the deliberate build breakage can be removed from the build by
commenting out the #define lines in that file. I have not dug into this so am
unsure if some math functions are called indirectly and lead to float/double
conversions that they don't want.

Removing the #defines in math-undefs.h should allow any clang or gcc>4.2 to be
used. It was about 2 years ago I looked at this and think this got it to
compile on 8.x and 9.x

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