Messages in this thread | | | Date | Wed, 14 Jul 2004 14:40:44 -0700 (PDT) | From | Song Wang <> | Subject | Re: [kbuild-devel] kbuild support to build one module with multiple separate components? |
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Hi, Sam
Thanks for the reply.
However, in the way you indicate, the mainmodule and each submodule will be built as separate kernel modules. You will get mainmodule.ko, a_sub_module.ko, b_sub_module.ko etc.
This is not what I tried to get. I tried to build a single kernel module, which means that mainmodule.o, a_sub_module.o, b_sub_module.o should be linked together to produce the single module.
This will be convenient, for instance, for distribution because you need only to distribute one kernel module instead of a long list of modules.
-Song
--- Sam Ravnborg <sam@ravnborg.org> wrote: > On Fri, Jul 02, 2004 at 04:47:35PM -0700, Song Wang > wrote: > > Hi, Folks > > > > I'm puzzled by the kbuild system in 2.6 kernel. > > I want to write a kernel module, which consists of > > several components. The module is produced by > > linking these components. These components are > located > > in separate subdirectories (for example A, B,C). > > Each component is generated also by linking > > multiple files. (For example, a_1.c, a_2.c for > > building A.o, b_1.c, b_2.c for building B.o, then > A.o > > and B.o > > should be linked to produce mymodule.o) > > > > I know if I put all the files in a single > directory > > The makefile of the module looks like > > > > obj-$(CONFIG_MYMODULE) += mymodule.o > > mymodule-objs := a_1.o a_2.o b_1.o b_2.o c_1.o > c_2.o > > > > It should work. But it is really messy, especially > > there are a lot of files or each component > requires > > different EXTRA_CFLAGS. However, if I write > > separate Makefiles for each component in their own > > subdirectory, the Makefile of component A looks > like > > > > obj-y := A.o (or obj-$(CONFIG_MYMODULE) += A.o) > > A-objs := a_1.o a_2.o > > > > This is wrong, because kbuild will treat A as > > independent module. All I want is to treat > > A as component of the only module mymodule.o. It > > should be linked to mymodule.o > > > > Any idea on how to write a kbuild Makefile to > > support such kind of single module produced > > by linking multiple components and each component > > is located in separate directory? Thanks. > > > Hi Song (added lkml to cc:). > > You just need to have one common module usign all > the sub-modules. > > So having each sub-module in directory M/sub-a > M/sub-b etc. > you need a makefile in M/ that looks like: > M/Makefile: > obj-m += sub-a/ > obj-m += sub-b/ > obj-m += mainmodule.o > > In each sub-directory you need a separate Makefile > like: > M/sub-a/Makefile > obj-m += a_sub_module.o > > Then all symbols used by the mainmodule needs to be > properly > exported in each sub-module. > > Hope this clarifies it. > > Sam >
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