kbuild: support building individual files for external modules
Support building individual files when dealing with separate modules.
So say you have a module named "foo" which consist of two .o files bar.o
and fun.o.
You can then do:
make -C $KERNELSRC M=`pwd` bar.o
make -C $KERNELSRC M=`pwd` bar.lst
make -C $KERNELSRC M=`pwd` bar.i
make -C $KERNELSRC M=`pwd` / <= will build all .o files
and link foo.o
make -C $KERNELSRC M=`pwd` foo.ko <= will build the module
and do the modpost step
to create foo.ko
The above will also work if the external module is placed in a
subdirectory using a hirachy of kbuild files.
Thanks to Andreas Gruenbacher <agruen@suse.de> for initial feature
request / bug report.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Sam Ravnborg
parent
bd71c2b174
commit
06300b21f4
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@ -13,6 +13,7 @@ In this document you will find information about:
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--- 2.2 Available targets
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--- 2.3 Available options
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--- 2.4 Preparing the kernel tree for module build
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--- 2.5 Building separate files for a module
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=== 3. Example commands
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=== 4. Creating a kbuild file for an external module
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=== 5. Include files
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@ -131,6 +132,16 @@ when building an external module.
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Therefore a full kernel build needs to be executed to make
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module versioning work.
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--- 2.5 Building separate files for a module
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It is possible to build single files which is part of a module.
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This works equal for the kernel, a module and even for external
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modules.
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Examples (module foo.ko, consist of bar.o, baz.o):
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make -C $KDIR M=`pwd` bar.lst
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make -C $KDIR M=`pwd` bar.o
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make -C $KDIR M=`pwd` foo.ko
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make -C $KDIR M=`pwd` /
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=== 3. Example commands
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66
Makefile
66
Makefile
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@ -137,7 +137,7 @@ objtree := $(CURDIR)
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src := $(srctree)
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obj := $(objtree)
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VPATH := $(srctree)
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VPATH := $(srctree):$(KBUILD_EXTMOD)
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export srctree objtree VPATH TOPDIR
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@ -849,27 +849,6 @@ prepare prepare-all: prepare0
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export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
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# Single targets
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# ---------------------------------------------------------------------------
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%.s: %.c scripts FORCE
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$(Q)$(MAKE) $(build)=$(@D) $@
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%.i: %.c scripts FORCE
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$(Q)$(MAKE) $(build)=$(@D) $@
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%.o: %.c scripts FORCE
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$(Q)$(MAKE) $(build)=$(@D) $@
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%.ko: scripts FORCE
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$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
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$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
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%/: scripts prepare FORCE
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$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
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%.lst: %.c scripts FORCE
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$(Q)$(MAKE) $(build)=$(@D) $@
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%.s: %.S scripts FORCE
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$(Q)$(MAKE) $(build)=$(@D) $@
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%.o: %.S scripts FORCE
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$(Q)$(MAKE) $(build)=$(@D) $@
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# FIXME: The asm symlink changes when $(ARCH) changes. That's
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# hard to detect, but I suppose "make mrproper" is a good idea
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# before switching between archs anyway.
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@ -1192,6 +1171,11 @@ help:
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@echo ' modules_install - install the module'
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@echo ' clean - remove generated files in module directory only'
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@echo ''
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# Dummies...
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.PHONY: prepare scripts
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prepare: ;
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scripts: ;
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endif # KBUILD_EXTMOD
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# Generate tags for editors
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@ -1313,6 +1297,44 @@ kernelrelease:
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kernelversion:
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@echo $(KERNELVERSION)
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# Single targets
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# ---------------------------------------------------------------------------
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# The directory part is taken from first prerequisite, so this
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# works even with external modules
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%.s: %.c scripts FORCE
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$(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
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%.i: %.c scripts FORCE
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$(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
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%.o: %.c scripts FORCE
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$(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
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%.lst: %.c scripts FORCE
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$(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
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%.s: %.S scripts FORCE
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$(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
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%.o: %.S scripts FORCE
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$(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
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# For external modules we shall include any directory of the target,
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# but usual case there is no directory part.
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# make M=`pwd` module.o => $(dir $@)=./
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# make M=`pwd` foo/module.o => $(dir $@)=foo/
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# make M=`pwd` / => $(dir $@)=/
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ifeq ($(KBUILD_EXTMOD),)
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target-dir = $(@D)
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else
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zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
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target-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
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endif
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/ %/: scripts prepare FORCE
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$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
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$(build)=$(target-dir)
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%.ko: scripts FORCE
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$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
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$(build)=$(target-dir) $(@:.ko=.o)
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$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
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# FIXME Should go into a make.lib or something
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# ===========================================================================
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