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>

diff --git a/Documentation/kbuild/modules.txt b/Documentation/kbuild/modules.txt
index 7e77f93634ea507569e3554434fe7978767d7fba..87d858df4e3479bfd85b0be27f1f4b5c73a8c78a 100644 (file)
--- a/Documentation/kbuild/modules.txt
+++ b/Documentation/kbuild/modules.txt
@@ -13,6 +13,7 @@ In this document you will find information about:
           --- 2.2 Available targets
           --- 2.3 Available options
           --- 2.4 Preparing the kernel tree for module build
+          --- 2.5 Building separate files for a module
        === 3. Example commands
        === 4. Creating a kbuild file for an external module
        === 5. Include files
@@ -131,6 +132,16 @@ when building an external module.
              Therefore a full kernel build needs to be executed to make
              module versioning work.
 
+--- 2.5 Building separate files for a module
+       It is possible to build single files which is part of a module.
+       This works equal for the kernel, a module and even for external
+       modules.
+       Examples (module foo.ko, consist of bar.o, baz.o):
+               make -C $KDIR M=`pwd` bar.lst
+               make -C $KDIR M=`pwd` bar.o
+               make -C $KDIR M=`pwd` foo.ko
+               make -C $KDIR M=`pwd` /
+       
 
 === 3. Example commands
 

diff --git a/Makefile b/Makefile
index 77a448c8e77654594495d78639e71fd303e35f4f..639d8a48bbde5e246ff43fc3ab87a71ca771d38d 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -137,7 +137,7 @@ objtree             := $(CURDIR)
 src            := $(srctree)
 obj            := $(objtree)
 
-VPATH          := $(srctree)
+VPATH          := $(srctree):$(KBUILD_EXTMOD)
 
 export srctree objtree VPATH TOPDIR
 
@@ -849,27 +849,6 @@ prepare prepare-all: prepare0
 
 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 
-# Single targets
-# ---------------------------------------------------------------------------
-
-%.s: %.c scripts FORCE
-       $(Q)$(MAKE) $(build)=$(@D) $@
-%.i: %.c scripts FORCE
-       $(Q)$(MAKE) $(build)=$(@D) $@
-%.o: %.c scripts FORCE
-       $(Q)$(MAKE) $(build)=$(@D) $@
-%.ko: scripts FORCE
-       $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D) $(@:.ko=.o)
-       $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
-%/:      scripts prepare FORCE
-       $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) $(build)=$(@D)
-%.lst: %.c scripts FORCE
-       $(Q)$(MAKE) $(build)=$(@D) $@
-%.s: %.S scripts FORCE
-       $(Q)$(MAKE) $(build)=$(@D) $@
-%.o: %.S scripts FORCE
-       $(Q)$(MAKE) $(build)=$(@D) $@
-
 #      FIXME: The asm symlink changes when $(ARCH) changes. That's
 #      hard to detect, but I suppose "make mrproper" is a good idea
 #      before switching between archs anyway.
@@ -1192,6 +1171,11 @@ help:
        @echo  '  modules_install - install the module'
        @echo  '  clean           - remove generated files in module directory only'
        @echo  ''
+
+# Dummies...
+.PHONY: prepare scripts
+prepare: ;
+scripts: ;
 endif # KBUILD_EXTMOD
 
 # Generate tags for editors
@@ -1313,6 +1297,44 @@ kernelrelease:
 kernelversion:
        @echo $(KERNELVERSION)
 
+# Single targets
+# ---------------------------------------------------------------------------
+# The directory part is taken from first prerequisite, so this
+# works even with external modules
+%.s: %.c scripts FORCE
+       $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
+%.i: %.c scripts FORCE
+       $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
+%.o: %.c scripts FORCE
+       $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
+%.lst: %.c scripts FORCE
+       $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
+%.s: %.S scripts FORCE
+       $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
+%.o: %.S scripts FORCE
+       $(Q)$(MAKE) $(build)=$(dir $<) $(dir $<)$(notdir $@)
+
+# For external modules we shall include any directory of the target,
+# but usual case there is no directory part.
+# make M=`pwd` module.o     => $(dir $@)=./
+# make M=`pwd` foo/module.o => $(dir $@)=foo/
+# make M=`pwd` /            => $(dir $@)=/
+ 
+ifeq ($(KBUILD_EXTMOD),)
+        target-dir = $(@D)
+else
+        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
+        target-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
+endif
+
+/ %/:      scripts prepare FORCE
+       $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
+       $(build)=$(target-dir)
+%.ko: scripts FORCE
+       $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
+       $(build)=$(target-dir) $(@:.ko=.o)
+       $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
+
 # FIXME Should go into a make.lib or something 
 # ===========================================================================