Since commit f5f169ba99 "Split build rules for tools to allow
skipping them." these recursive makefiles are not used.
(debian/rules.d/Makefile can additionally install the top-level Kbuild
and Makefile, but that target hasn't been used since svn rev 18133
(version 3.1-1~experimental.1).)
Because these command lines don't start with "$(MAKE)", we should
tell make that we are recursing. Without this, the child make
can't run more than one job in parallel (and warns about this).
The upstream Makefile uses DEBUG to control both stripping of debug
information *and* disabling optimisations.
We want to disable stripping of debug information so that (normally)
dh_strip can move it into a separate package later. However we also
want to enable optimisations by default.
Therefore:
- Set the STRIP variable (a command prefix) to "true"
- Set the DEBUG variable (a pseudo-boolean) to "true" if and only if
the "noopt" build option is used
Pass $(CROSS_COMPILE) or host GNU type through to upstream build rules.
debian/rules.real: Filter tools packages by host arch, not build arch
debian/rules.d/Makefile: Build the tools needed for headers_install in
a separate subdirectory
Ben Hutchings