iputils fails to cross-build

This failure can be fixed with the attached patch to make sure the host arch compiler is used and the system library search path, not the 'Make' search path is used.

A patched version is uploaded here:
https://launchpad.net/~linaro-foundations/+archive/cross-alip

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Thanks for the patch. I had to merge this up with the current version in precise anyway, and along the way, there are a few things I think could be improved:

 * The $(origin CC) stuff is overcomplicated. We don't need to patch the upstream Makefile to support overriding debian/rules, as the ordinary semantics of make already allow us to do so; all we need to do is pass CC=$(DEB_HOST_GNU_TYPE)-gcc on make's command line, rather than as an environment variable. (I'd rather we established patterns that involved minimal need to patch upstream files wherever possible; 'CC = gcc' is extremely common and it would be good not to have to patch that all over the place.)
 * Using -lfoo as a prerequisite indeed won't work with cross-building, so I agree that we need to patch the upstream Makefile for that. I'm not comfortable with doing so by adding unnecessary linkage to all output executables, though. A neater way is to use target-specific variables, e.g. 'arping: LDLIBS = -lsysfs'.
 * We should have a DEP-3 patch header for the remaining upstream patch.

I've gone ahead and done this, tested it in my cross-building environment, and uploaded to precise; patch attached. I'll forward this to Debian shortly. Let me know if you think something still needs to be revised, of course!

This bug was fixed in the package iputils - 3:20101006-1ubuntu1

---------------
iputils (3:20101006-1ubuntu1) precise; urgency=low

  * Support cross-building (thanks to Wookey <email address hidden> and Harry
    Liebel; LP: #872370).
 -- Colin Watson <email address hidden> Tue, 08 Nov 2011 13:17:14 +0000