libcxx database corrupted, universal broken, weird circular dependency

[gaming-hacker (G Alexander)]

All,

This port is really hosed, so far this update breaks any builds that uses are not built as universal. I have to wish to support anything i386 whatsoever. my default is -universal in the macports conf file.

So I needed to update ghostscript.

UPgrading Port
--->  Computing dependencies for libcxx
Error: Cannot install libcxx for the archs 'i386 x86_64' because
Error: its dependency libxml2 only supports the arch 'x86_64'.

displaying ino on libcxx reveals

Full Name: libcxx @6.0.0+universal
libcxx @6.0.0_1 (lang)

The following ports are dependent on libcxx:
  clang-6.0
  cmake
  ld64-latest
    ld64
      gcc8
      libgcc-devel
        libgcc6
        py27-numpy
  llvm-6.0
    cctools
clang-6.0 depends on libcxx
cmake depends on libcxx
ld64-latest depends on libcxx
llvm-6.0 depends on libcxx
The following ports are currently installed:
  libcxx @5.0.1_2+universal (active)

the database display the new version but the old version is active. how this is possible, i have no idea.

i forced an upgrade to libxml2 by creating a revision 1 and resulting error is

UPgrading Port
--->  Computing dependencies for libcxx
Error: Cannot install libcxx for the archs 'i386 x86_64' because
Error: its dependency libxml2 only supports the arch 'x86_64'.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
[14:15][226]~/local/macports-ports

now i have to fix a lot of dependencies, zlib, xz, libffi, libedit, etc

There needs to be a fix so that if the default compiler already relies on libcxx, not to use that compiler; in my case clang6.0 and don't require universal.