Since not all the buildsystem we support use make for the actual build, and they don't necessarily support make-like options (-jX -s and so on), it would be nice to be able to express a JOBS variable that could be used for parallel build with any build systems.
Right now there are ebuilds like openoffice or some scons-based ebuilds
that parse MAKEOPTS and get out of that the number of jobs from the -j
option, but this is a) suboptimal b) error-prone.
One has to consider people might be using -l for parallel building too,
for which reasons I'd be suggesting doing something like this to make
the change transparent:
- ebuilds using non-make build systems would use JOBS;
- ebuilds using make builds systems would just use emake as usual;
- Portage takes care, if JOBS is unset, to parse it out of MAKEOPTS;
- if user has set JOBS but not MAKEOPTS this defaults to -j${JOBS};
- if user has JOBS and MAKEOPTS, MAKEOPTS keeps the same (for -l).
The result is that you can finally combine -l with parallel build on
OpenOffice and other packages, with a fallback number of maximum jobs
instead of using load-based decisions.
--
Diego "Flameeyes" Pettenò
http://blog.flameeyes.eu/
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