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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: Harvesting failed compilation...
Date: Wed, 6 Dec 2017 08:38:06 +0200
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References: <20171205160840.xbivk63rbhb3nufc@solfire>
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On 05/12/17 18:08, tuxic@posteo.de wrote:
> after emerge -e @world --keepgoing
> I got this packages, which failed to compile, listed
> [...]
> 
> make failed
> glibc failed
> libstd++ failed
> 
> so...the less important packages so to say.
> 
> And after fixing those -- if possible -- I guess that I doomed
> to start the whole process right from the beginning.

If you can fix them, portage should still remember the previous run and 
keep rebuilding world from where it stopped. It remembers 2 past failed 
emerges when using --resume. See "man emerge", in the "--resume" section.

In this case, do "emerge --resume" first, but when the first package in 
the list starts to emerge, abort with Ctrl+C. This will count as a 
failed emerge and the resume list will get updated and remember that one 
as the most recent one. Then do a backup copy of /var/cache/edb/mtimedb. 
Now try and fix the packages. After you fixed them, see if "emerge 
--resume" still remembers the last world rebuild. If not, copy the 
backed up file back and now "emerge --resume" should continue building 
from where it last failed.