Re: [gentoo-user] Question about compilation

[Jack <ostroffjh@users.sourceforge.net>]

On 2025.02.08 14:00, Filip Kobierski wrote:
> Hi Jacques,
> 
> I think you are looking for SIGSTP or SIGSTOP but I think that's
> not exactly it. From what I know you cannot do that for emerge
> easily. For similar results you might want to set up ccache.
> https://wiki.gentoo.org/wiki/Ccache
> 
> Regards
> Filip
> 
> On Saturday, February 8th, 2025 at 15:47, Jacques Montier  
> <jmontier@gmail.com> wrote:
> 
> > Hello everyone,
> > Is it possible to stop a compilation midway in the case of a very  
> long compilation and then resume it from the same point without  
> having to start over from the beginning ?
> > Thank you for your response.
> > Best regards,
> >
> > --
> > Jacques Montier.
> 
If you really mean just interrupting a compile, then you should be able  
to stop with Ctl-C, and then start/continue by running make or ninja  
again, assuming that is what is used for whatever you are compiling.   
Ccache can help since most of the results of the previous compile  
attempt will have been cached, and so will be completed more quickly  
the next time, but it's not the same as continuing from where it was  
interrupted.

If, as Filip implies, you are asking about interrupting emerge, it's  
easy enough to interrupt, but essentially impossible to continue from  
where it left off.  "emerge --continue" will just try to emerge every  
package from the interrupted emerge which was not completed, but it  
will start each one from scratch.  What has often, but not alwasy  
worked for me, is to use ebuild directly.  "ebuild  
.../path/to/package.ebuild compile" will figure out that everything  
prior to the compile was completed, and then issue the make or ninja  
commands, which will just pick up where they left off.  If that does  
work, then you need to repeat the ebuild, but with the install and then  
the qmerge commands.  The only problem with that (for me, at least) is  
that ebuild does not leave exactly the same lines in emerge.log, so a  
package installed that way will not show up in "gentlop -t package"  
output.