Bug#148932: dpkg-dev: dpkg-buildpackage -B should try build-arch target

[Peter S Galbraith <psg@debian.org>]

Package: dpkg-dev
Version: 1.9.20
Severity: wishlist

I was told today that autobuilders use `dpkg-buildpackage -uc -us -B
-r<getrootcommand>` to build packages for the various arches.  Therefore
a lot of CPU cycle are wasted building arch-independent stuff that will
never be used (since the _all package isn't prepared but the content are
built).

Policy was recently changed in order to accomodate this situation.  See
http://bugs.debian.org/72335

It would be nice if `dpkg-buildpackage -B` first tried the build-arch
target of debian/rules and only revert to the more lengthy and wasteful 
build target if build-arch weren't present.  I'm sure this would help
slower arches such as m68k keep up.

Thanks,
Peter


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