Re: [gentoo-dev] EJOBS variable for EAPI 5?

[Zac Medico]

On 09/04/2012 04:00 AM, Walter Dnes wrote:
> On Sat, Sep 01, 2012 at 05:20:02PM -0700, Brian Harring wrote
>
>> This approach is fine imo, although I'd *potentially* look at adding a
>> magic $PROC_COUNT var that is the # of cpu threads on the system;
>> either that or defaulting jobs to it.
>>
>> I rather dislike requiring users to go jam a 2/4/8 in there when it's
>> easy to compute.  That said, it's minor.
>>
>> Either way, yes, I think EJOBS should be in EAPI5.
>
>   One question about the suggested EJOBS variable; will it over-ride
> MAKEOPTS?  Every so often on the Gentoo-user list, someone comes along
> with a mysterious build failure.  The first suggestion is to reset
> MAKEOPTS to -j1.  And on some occasions, that is indeed the solution to
> the mysterious build failure.

That would be due to a missing dependency in the Makefiles, and using
-j1 is just a workaround. The ebuild can be hardcoded to use emake -j1
until the Makefile gets fixed.

>   I set -j1 and leave it that way.  Yes, the builds take longer, but the
> resulting binary is just as fast.  And the amount of time I "save" will
> be blown away the first time I end up screwing around a couple of hours
> trying to fix a mysterious build failure.  That's why I want the user to
> have the option of over-riding EJOBS, should it ever be implemented.

You could use EXTRA_EMAKE for that. You can do per-package settings via
/etc/portage/package.env.
-- 
Thanks,
Zac