Clang-6 and GNUisms.

Hi

There's been some fallout in ports land since clang-6 around null
pointer arithmetic and casts.  I cannot think of a good reason for doing
the following but then I've not dabbled in the arcane much:

# define __INT_TO_PTR(P) ((P) + (char *) 0)

So far I've encountered these in lang/v8 and devel/avr-gcc.  I know it
just generates warnings, but GNUisms and -Werror abound.  Adding
-Wno-null-pointer-arithmetic and -Wno-vexing-parse to CFLAGS/CXXFLAGS
provides some relief but V8 still fails:

/usr/ports/lang/v8/work/v8-3.18.5/out/native/obj.target/v8_base.x64/src/type-info.o../src/stub-cache.cc:1477:33:
error: reinterpret_cast from 'nullptr_t' to 'char *' is not allowed
      : GetCodeWithFlags(flags, reinterpret_cast<char*>(NULL));

                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I haven't got avr-gcc to compile yet.

Ian

-- 
Ian Freislich


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