| 1 |
On Mon, 19 Sep 2011 16:10:02 +0200, Alan McKinnon wrote about Re: |
| 2 |
[gentoo-user] Re: Updating libpng: another libtool cockup?: |
| 3 |
|
| 4 |
> On Mon, 19 Sep 2011 03:06:30 -0700 |
| 5 |
> walt <w41ter@×××××.com> wrote: |
| 6 |
[snip] |
| 7 |
> > I don't skip the --library step any more. |
| 8 |
> |
| 9 |
> That's odd behaviour, I wonder what caused the difference. |
| 10 |
|
| 11 |
I guess your graph theory is out to lunch today. ... :-) |
| 12 |
|
| 13 |
The problem is portage determining the dependency graph, but ebuilds do |
| 14 |
not contain enough information to do this thoroughly. The best |
| 15 |
example, at least in my memory, was the libexpat upgrade about 4 years |
| 16 |
ago that trashed everybody's system -- many resorted to complete |
| 17 |
re-installation. |
| 18 |
|
| 19 |
At the end of that upgrade, there was an instruction to preform a |
| 20 |
revdep-rebuild specifically for libexpat.so. Now, this upgrade |
| 21 |
coincided with a full upgrade to KDE plus a full upgrade to GNOME, all |
| 22 |
on the same day. As a result, the message to do a revdep-rebuild |
| 23 |
specifically on libexpat was buried in other bumpf, plus there was other |
| 24 |
library breakage out the yin-yang -- an extremely large yin-yang. It |
| 25 |
was a sysadmin's perfect storm. |
| 26 |
|
| 27 |
Doing a simple revdep-rebuild, with no library constraint, caused |
| 28 |
ebuild breakage by the mile. This was because the subroutines in |
| 29 |
libexpat are used inside ebuild processing by documentation utilities |
| 30 |
such as ghostscript, xsltproc, etc. |
| 31 |
|
| 32 |
OTOH, if one did a specific revdep-rebuild on libexpat, all of those |
| 33 |
documentation utilities would be rebuilt before the main |
| 34 |
revdep-rebuild. After that, the ebuilds all went smoothly. |
| 35 |
|
| 36 |
Unfortunately, Portage does not have enough information to infer these |
| 37 |
deep dependencies. This means it cannot schedule the more fundamental |
| 38 |
revdep-rebuild ahead of those that depend upon it. We have to do that |
| 39 |
by hand. |
| 40 |
|
| 41 |
I hope this has explained why we should take messages about running |
| 42 |
"revdep-rebuild --library libXXX" seriously. |
| 43 |
-- |
| 44 |
Regards, |
| 45 |
|
| 46 |
Dave [RLU #314465] |
| 47 |
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* |
| 48 |
dwnoon@××××××××.com (David W Noon) |
| 49 |
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* |
Archives