[H-GEN] stderr redirection

[Clinton Roy]

Hey folks.

I'm using a continuous integration service called bitten, it plugs
into trac quite nicely.

One of the steps in the bitten recipe is a "make all" step. Bitten
will take a log of stdout and stderr of this, so that you can easily
work out why a build has failed.

As a further step to this, I've written a filter that takes gcc's
warnings and stores them in bitten's database. Gcc writes errors to
stderr, so I'm using:

make all 2> errors.txt

which works fine for the error filter, but it means that bitten does
not get to see stderr, thus when a build fails the reason for it is
hidden.

I'd like some help to get a sh snippet such that bitten will get to
see stdout and stderr as normal, but stderr will also get stored in
errors.txt

I've tried a few things, like:

exec 3>just.stderr
make all 3>&2

and although just.stderr gets created, none of the stderr gets copied to it.

thanks for any help :)

-- 
Clinton Roy
CSIRO - Robotics Platform Engineer
Autonomous Systems Lab

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