Along with the addition of signed kernel modules in newer kernel
we have a few new build products we need to ignore. LKLM has the
whole thread for those interested: http://lkml.org/lkml/2007/2/14/164
The previous hack for this was to move headers 3 levels deep in to
the top level include dir and headers 4 levels deep in to sys.
Obviously this was fairly limiting and missed two important headers.
./zfs/include/sys/fm/fs/zfs.h
./zfs/include/sys/fs/zfs.h
This patch updates the code to be smarter and installs all the headers
to the correct location regardless of depth. Each header will have its
leading 3 path args stripped (i.e. ./zfs/include/) and replaced with
the correct install destination. All path information past the first
three levels will be preserved.
If the distro/installation really is unsupported (i.e. unknown) we should
not make it look like a known distribution (i.e. RHEL) complete with
dependencies on other RPMs and trying to find kenrel source in the RH
standard location.
/lib/modules/$(uname -r)/source. This will likely fail when building
under a mock (http://fedoraproject.org/wiki/Projects/Mock) chroot
environment since `uname -r` will report the running kernel which
likely is not the kernel in your chroot. To cleanly handle this
we fallback to using the first kernel in your chroot.
The kernel-devel package which contains all the kernel headers and
a few build products such as Module.symver{s} is all the is required.
Full source is not needed.
Twice now I've been bitten by building agaist a kernel which is
configured such that it is incompatible with the CDDL license. These
build failures don't occur until the linking phase at which point they
simply callout the offending symbol. No location information can be
provided at this point so it often can be confusing what the problem is
particularly when building against a new kernel for the first time.
To help address this I've added a configure check which can be extended
over time to detect known kernel config options which if set will break
the ZFS build. Currently I have just added CONFIG_DEBUG_LOCK_ALLOC which
makes mutex's GPL-only and is on by default in the RHEL6 alpha builds.
I know for a fact there are other similiar options which can be added
as they are encountered.
Brian Behlendorf
Ricardo M. Correia
Brian J. Murrell