Messages in this thread | | | Date | Wed, 26 Sep 2007 11:56:16 +0200 | From | Henry Nestler <> | Subject | Re: kbuild: LDFLAGS_MODULE unusable for external module builds (2.6.23-rc2) |
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Hello Sam,
Sam Ravnborg wrote: > Hi Henry. > > On Tue, Sep 25, 2007 at 11:49:44AM +0200, Henry Nestler wrote: >> In reference of git 114f51577724b782a30f4f5ceaee9880de93d776: >>> kbuild: use LDFLAGS_MODULE only for .ko links >>> >>> Sam Ravnborg pointed out that Documentation/kbuild/makefiles.txt >>> already >>> says this is what it's for. This patch makes the reality live up to >>> the >>> documentation. This fixes the problem of LDFLAGS_BUILD_ID getting >>> into too >>> many places. >> LDFLAGS_MODULE is not usable in module build out of kernel tree since >> 2.6.23-rc2. LDFLAGS_$@ should use, but does never work. - Not for >> external module builds with the option "M=..." > > LDFLAGS_MODULE are reserved for architectures and modules be external > or not should never ude LDFLAGS_MODULE. > And LDFALGS_$@ have never been documented to work for modules - dunno > where you have that from. > IIRC we only use LDFALGS_$@ in the ld macro to be used by bootloaders. > >> What macro should set for linker parameters of foo.o ? I'm not shure. > Have you read: > Documentation/kbuild/makfilefiles.txt?
Yes. This was a *very* helpfull. And many examples spokes about LDFLAGS_$@ there. Not directly described for modules.
>>From your description you want to add a specific set of options to > the linker in a specific Kbuild file. > This is what EXTRA_LDFLAGS are present to help you with. > > As for the: >> # Deal with recursive depens of libraries > I am not sure what you mean (despite yout comprehensive description).
depens = lib1 has external dependently from lib2, and lib2 later depends on externals from lib1. The main problem is, how can add multiple lib.a to module?
> Please try if EXTRA_LDFLAGS := --start-group lib.a --end-group > will solve your need.
isn't usable. There I have problems with dependencies. dir/lib.a would not build, if lib.a is not in the list "...-objs".
> I'm afraid not due to the placement of the --start-group --end-group. > If this does not help you please give me specific examples of how > the ld command-line should be then I can see how we tweak kbuild > to help you.
An abstracted Makefile shows: obj-y := dir1/ dir2/ dir3/ obj-m := name.ko name-objs = foo.o dir1/lib.a dir2/lib.a dir3/lib.a EXTRA_LDFLAGS := --start-group # recursive dependencies of libraries
From short testing was seen the flags ok. The current project Makefile is in [1]. I will try "EXTRA_LDFLAGS := --start-group" without the end-group in the project tree and mail again. Thanks for your help.
[1] http://colinux.svn.sourceforge.net/svnroot/colinux/branches/devel/src/colinux/os/linux/kernel/module/Makefile
-- Henry
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