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Subject: Re: [gentoo-user] Re: make an -9999 ebuild compile only if necessary
From: Paul Hartman <paul.hartman+gentoo@gmail.com>
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On Tue, Dec 22, 2009 at 11:37 AM, Nikos Chantziaras <realnc@arcor.de> wrote:
> On 12/22/2009 07:21 PM, Helmut Jarausch wrote:
>>
>> Hi,
>>
>> I have ebuilds fetching the source code directly from a repository
>> (be it CVS,SVN,HG,GIT,...)
>> I'd like to modify the .ebuild to enter compilation only if something
>> has been updated.
>> Is this possible, has somebody else tried to do so?
>
> Given that portage relies on USE flags and version numbers to decide on
> whether a rebuild is necessary, no, it's not possible.
>
> But I'd be interested too if someone could think of some clever hack to
> accomplish this :)

Maybe just make the merge fail. So that way you could "emerge
@live-rebuild --keep-going" and it would only actually emerge things
that had changed.