Comment 0 for bug 1769657

I'd like to update the toolchain packages in bionic, to state which we have in cosmic on May 07:

 - binutils updates from the branch
 - gcc-8, update to the final 8.1.0 release
 - gcc-7, updates to the gcc-7-branch up to the time of the
   8.1.0 release.
 - gcc-defaults to bump the 8.1 version, and add some provides
 - build-essential to add cross packages for amd64 and i386
 - corresponding gcc-cross packages

The package builds are prepared in
https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/ppa/+packages