Building stage1 only

[Ömer Sinan Ağacan]

> Out of sheer curiosity: in what situations does that happen for you? *If* you
> are working on a single branch, ie. you're not switching back and forth
> between master and your feature branches, this should not happen (and even if
> you switch between branches it should still be safe for most of the time).

I'm actually swtiching branches quite a lot, because most of the time I have
multiple tasks at hand, working on multiple tickets etc.

But I think there's another way to introduce this kind of failures. Since
compilation take very long, I never start the build process and wait until it's
done, I keep coding in the meantime. Maybe I should rsync changes manually to
another directory and run build there while I keep working on current tree etc.


I just tried `make 1` in ghc directory and I think it worked(I'll try on a
clean tree once I have to `make clean` and see if it's really building only
stage-1). But my next question is why marking it as such in build.mk doesn't
work.. I'd expect `devel1` to build stage1 only.

2015-10-20 3:12 GMT-04:00 Jan Stolarek <jan.stolarek at p.lodz.pl>:
>> it's very easy to end up in a state where `make` simply can't build, and only
>> easy fix is a `make clean`
> Out of sheer curiosity: in what situations does that happen for you? *If* you are working on a
> single branch, ie. you're not switching back and forth between master and your feature branches,
> this should not happen (and even if you switch between branches it should still be safe for most
> of the time). Richard already gave you a trick (cd ghc/ && make 2) that allows to build only
> stage 2 compiler without rebuilding stage 1 or any of the libraries. One situation that comes to
> my mind that can really require a full rebuild is changing format of interface files. But other
> than that you shouldn't have to do a full rebuild too often.
>
> I know how you feel. When I started working on GHC I had to do a full rebuild very often. But now
> I improved my workflow and only do a full build after a major rebase of my branch against master.
>
> Janek
>
> ---
> Politechnika Łódzka
> Lodz University of Technology
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