Re: Export objs from an external Makefile?

[Tom Rini]

On Fri, Oct 12, 2001 at 10:14:38AM +1000, Keith Owens wrote:
> On Thu, 11 Oct 2001 16:57:34 -0700, 
> Tom Rini <[e-mail]> wrote:
> >On Fri, Oct 12, 2001 at 09:42:05AM +1000, Keith Owens wrote:
> >> On Thu, 11 Oct 2001 09:35:32 -0700, 
> >> Tom Rini <[e-mail]> wrote:
> >> >Hey all.  How do you do the 'export-objs' bits in a kernel module that's
> >> >outside of the kernel?  Thanks..
> >> 
> >> Compile with -DMODULE -DEXPORT_SYMTAB.  If the kernel has modversions,
> >> add -DMODVERSIONS -include $(HPATH)/linux/modversions.h.  The safest
> >> way is to compile a module in the kernel that exports the objects then
> >> copy the command, substituting the file names.
> >
> >I think I managed to get things right.  I added -DEXPORT_SYMTAB to the
> >default flags and added:
> >CFLAGS_EXTRA	+= $(shell if [ -f $(KERNEL_HEADERS)/linux/modversions.h ]; \
> >			then echo -include \
> >			$(KERNEL_HEADERS)/linux/modversions.h; fi)
> 
> You need -DMODVERSIONS as well.

D'oh...

> Testing for the presence of modversions.h will not work in kbuild 2.5,
> that file is always created with error messages to catch people who
> include it "by hand".  OTOH, kbuild 2.5 has support for compiling
> outside the standard kernel tree so who cares :)?

Right.  I'm sure some changes will have to be made for external modules
once 2.5 is underway...

-- 
Tom Rini (TR1265)
http://gate.crashing.org/~trini/