Heads up: Upcoming dpkg-buildpackage -j precedence change

[Guillem Jover <guillem@debian.org>]

Hi!

“Recently” when adding support for «-jauto» to dpkg-buildpackage, I
noticed that the semantics for the -j option were quite unorthodox.
The value from the DEB_BUILD_OPTIONS paralle= option takes precedence
and overrides any explicit value passed on the commend-line via -j,
(when -j should be overriding the environment instead).

I'm not entirely sure what I was thinking when I did that change in
dpkg 1.14.15 (2008-01), but that specific part seems entirely broken.
But even then given that this behavior has been like that for a long
time now, I'm a bit hesitant to suddenly change it.

If you happen to depend on this behavior and stuff would break due to
that change, please shout and I'll deploy a staged transition with
warnings and similar, otherwise I'll just go ahead with the change.

Thanks,
Guillem