On 08/15/2009 03:33 AM, fe...@crowfix.com wrote:
[...]
This being 4.3.4 to 4.1.1 looks like a major version change according
to the upgrade guide. It doesn't mention what a switch manual takes,
but it does list a whole series of steps such as remerging system and
world without saying exactly when they or how much are necessary. I'd
just as soon not do that unless necessary, but I'd much more regret
not doing it if I should have.
Switching the compiler with gcc-config is enough with this update.
There are no ABI changes and packages built with GCC 4.3 will happily
work together with the ones build with 4.4.
I am doing an emerge -e system and emerge -e world anyway though since I
want to take advantage of the faster code 4.4 produces in general, but
also more specific whether or not the new "graphite" optimizer of GCC
4.4 (needs "graphite" USE flag enabled for gcc) will give additional
performance gain.
(If anyone is interested in that, you need to first add:
-floop-interchange -floop-strip-mine -floop-block
to CFLAGS/CXXFLAGS (the options enabling the Graphite optimizer) and
then "emerge -e" system and world.)
