[debhelper-devel] Bug#793440: debhelper: Could use dpkg-architecture env vars if present

[Guillem Jover]

Package: debhelper
Version: 9.20150629
Severity: wishlist
Control: block 793404 by -1

Hi!

When a package is built by using dpkg-buildpackage, it will set all
dpkg-architecture variables in the environment, so that the common
idiom:

  DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)

avoids having to run dpkg-architecture again.

But when using debhelper/dh, it always calls dpkg-architecture even if
those variables are already set in the environment, which can be quite
costly.

Here's a tentative untested patch that tries to do that.

Thanks,
Guillem
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