On Tue, Jul 26, 2005 at 01:28:41PM -0500, Eric Sandeen wrote:
> Christoph Hellwig started a thread a while ago about integrating kerntypes
> builds into kbuild, but I'm not sure anything came of it.
>
> Unfortunately I have to build some kerntypes files nonetheless. :)
>
> I'm currently building the kerntypes file as a hostprog, and forcing it to
> be built w/ kernel flags:
>
> # Kerntypes file
>
> # hostprogs-y, hostprogs-m, host-progs gyrations for older kbuild compat
> hostprogs-$(subst m,y,$(CONFIG_FOO)) := $(KERNTYPES_NAME)
> host-progs := $(hostprogs-y)
>
> $(KERNTYPES_NAME)-objs := kerntypes.o
>
> always := $(host-progs)
>
> # We compile/link it with kernelspace flags, even though it's not a
> module...
> HOSTCFLAGS_kerntypes.o := $(NOSTDINC_FLAGS) $(CPPFLAGS) $(CFLAGS) \
> $(EXTRA_CFLAGS) -g3
> # -r -nostdlib etc because kerntypes.c has no main()
> HOSTLOADLIBES_$(KERNTYPES_NAME) += -r -nostdlib
>
> but this seems pretty hacky to me, at best.
>
> It seems like maybe declaring it as a lib-y might work too, but my
> impression is that these libs are really only intended to be linked into
> the kernel image itself.
>
> Any other suggestions on a clean way to do this with the existing kbuild
> infrastructure?
The big issue with Kerntypes is that to be complete you need to link in
files from different places.
To create just a single Kerntypes.o file you can add the following to
kernel/Makefile, drivers/Makefile or similar.
It will not work if added in arch/$(ARCH)/Makefile!
always += Kerntypes.o
$(obj)/Kerntypes.o: $(src)/Kerntypes.c
$(CC) $(c_flags) -c $< -o $@
I added it to drivers/Makefile and the following gcc command line was
executed:
gcc -m32 -Wp,-MD,drivers/.Kerntypes.o.d -nostdinc -isystem
/usr/lib/gcc-lib/i586-pc-linux-gnu/3.3.5-20050130/include -D__KERNEL__
-Iinclude -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing -fno-common -ffreestanding -O2
-fomit-frame-pointer -pipe -msoft-float -mpreferred-stack-boundary=2
-march=i686 -Iinclude/asm-i386/mach-default
-DKBUILD_BASENAME=Kerntypes -DKBUILD_MODNAME=Kerntypes -c
drivers/Kerntypes.c -o drivers/Kerntypes.o
I hope this helps a bit.
PS. My example does not check for changes in dependencies end CONFIG
options.
That can be added if you like. You just have to use if_changed_dep.
See documentation in Documentation/kbuild/makefiles.txt
Sam
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