[HEADS UP] Kernel modules don't work properly in FreeBSD
faber at isi.edu
Thu Jun 24 01:15:14 UTC 2010
On Wed, Jun 23, 2010 at 08:45:31AM -0700, Ted Faber wrote:
> On Wed, Jun 23, 2010 at 11:03:45AM -0400, Ryan Stone wrote:
> > I have to admit that I'm more than a little surprised that this
> > problem does not affect modules that in src, but maybe that's because
> > I don't know all that much about FreeBSD's build infrastructure. Are
> > the src modules being linked with a linker script that is not being
> > used for out-of-src modules? Are the people affected by this not
> > using the base compiler to build ports?(I see that this affects PC-BSD
> > as well, and I'd be a little surprised to learn that it wasn't using
> > the base compiler).
> I had the problem on i386, base compiler. It also affects the sample
> module in /usr/share/examples/kld/cdev/ which also uses the base
> compiler, if you want a case w/o the ports infrastructure.
Just so it gets into Google:
Andriy Gapon went a few rounds of debugging with me and it turns out
that the problem was that the binutils port had installed a loader in
/usr/local/bin/ld that was incompatible with the module system.
(/usr/local/bin/ preceeds /usr/bin in my path so I can use the lpr
commands from cupsd, though it's evidently a bit of a dangerous idea.)
Basically if the linker you're using to compile isn't /usr/bin/ld you
may have problems building kernel modules.
The easiest way to detect this is to get the -v output (version number)
from the linker in use and compare it against /usr/bin/ld . I was able
to do that by adding LDFLAGS += -v to the Makefile in question.
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