lang/gcc6-aux for head beyond __nonnull related issues: vm_ooffset_t and vm_pindex_t related changes (and more)

[Gerald Pfeifer]

On Thu, 13 Apr 2017, Pedro Giffuni wrote:
> I didn’t want to get into this but the problem is that as part of it's
> build/bootstrapping process, GCC historically takes system headers
> and attempts to “fix” them. I am unsure the fixes do anything at all
> nowadays but the effect is that the compiler tends to take snapshots
> of the system headers when it is built. cdefs.h is used by all the
> system headers so changes in cdefs.h have good chances affecting
> such builds but any change are likely to cause similar trouble.
> 
> In the case of gcc-aux, it appears the compilation is based on a
> bootstrap compiler which already carries outdated headers.
> A workaround, suggested by gerald@ the last time a similar issue
> happened was to run for install-tools/fixinc.sh. I think that may
> regenerate the headers and let the build use updated headers.
> Ultimately gcc-aux needs maintainer intervention and using
> outdated headers will break sooner or later: especially on -current.

Indeed, thanks for the analysis/background, Pedro!

I had a look at gcc6-aux is based on the 20170202 snapshot of GCC 6, 
and perhaps John (as the maintainer of that port) has plans to update 
it?  Let me copy him.

Gerald

PS: John, if you have an update, happy to help and apply that for you.