Disruption of master from dports/packages coming in a few days

[John Marino]

The follow information only applies to people using the development
branch of DragonFly (aka master).  You can stop reading if you are using
an official release.

We've been tracking gcc5 for a couple of months and it is working very
well.  The muscles dports generator has been using gcc5 on top of a
gcc47-built world to generate all the packages, over 22,000
successfully.  There are a few ports, ~50 that aren't building yet,
mostly due to c++ incompatibility issues, but we can always require
gcc47 for those.  In short, dports is ready to be built by gcc5.

The GCC project plans to release gcc (as version 5.1) on 22 April.  I
plan to switch base compilers on Master for DragonFly at that time.
Several people have been running with gcc50-built worlds without problems.

After the switch, all existing package for Master will be obsolete.  I
will move these from
http://mirror-master.dragonflybsd.org/dports/dragonfly:4.2:x86:64/LATEST
to
http://mirror-master.dragonflybsd.org/dports/dragonfly:4.2:x86:64/GCC47

Anybody that isn't ready to replace all their packages at the time of
this change will have to manually adjust /usr/local/etc/pkgs/repos/ conf
file to point to the temporary GCC47 repository (which will be removed
at 4.2 release).

For a bullet-proof method of replacing all the packages with the new
versions, please refer to new entry in handbook:
http://www.dragonflybsd.org/docs/howtos/HowToDPorts/#index4h1

New gcc5-built packages for gcc5-built worlds will be placed in LATEST
at the same time.

Concurrently, the dports source tree will be updated with changes that
cause gcc50 to start building all the ports.  Anybody that is building
from source will need to remove all packages and rebuild them with the
latest source tree.  If that doesn't sound appealing then just update
the ports tree right now and don't update it anymore.  It will continue
to use gcc47 to build in that case (I think).

FYI the main problem is due to ABI changes in c++.  We can build with
gcc5 on a gcc47-built world thanks to a magic cxxflag, but we can't do
the opposite with c++.

Anyway, this is just a heads up.  I'll send another message when the
change actually happens (about a week from now).  The change to dports
source might precede it though.

John

P.S. As a bonus, pkg 1.50 is coming with the new dports tree.  It's
supposed to be a nice improvement over 1.4.12 from what I hear.