Subversion Repositories test_project

# ===========================================================================

# Module versions

# ===========================================================================

#

# Stage one of module building created the following:

# a) The individual .o files used for the module

# b) A .o file which is the .o files above linked together

# c) A .mod file in $(MODVERDIR)/, listing the name of the

#    the preliminary .o file, plus all .o files

# Stage 2 is handled by this file and does the following

# 1) Find all modules from the files listed in $(MODVERDIR)/

# 2) modpost is then used to

# 3)  create one .mod.c file pr. module

# 4)  create one Module.symvers file with CRC for all exported symbols

# 5) compile all .mod.c files

# 6) final link of the module to a  file

# Step 3 is used to place certain information in the module's ELF

# section, including information such as:

#   Version magic (see include/vermagic.h for full details)

#     - Kernel release

#     - SMP is CONFIG_SMP

#     - PREEMPT is CONFIG_PREEMPT

#     - GCC Version

#   Module info

#     - Module version (MODULE_VERSION)

#     - Module alias'es (MODULE_ALIAS)

#     - Module license (MODULE_LICENSE)

#     - See include/linux/module.h for more details

# Step 4 is solely used to allow module versioning in external modules,

# where the CRC of each module is retrieved from the Module.symers file.

# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined

# symbols in the final module linking stage

# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.

# This is solely usefull to speed up test compiles

PHONY := _modpost

_modpost: __modpost

include include/config/auto.conf

include scripts/Kbuild.include

include scripts/Makefile.lib

kernelsymfile := $(objtree)/Module.symvers

modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers

# Step 1), find all modules listed in $(MODVERDIR)/

__modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))

modules   := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))

# Stop after building .o files if NOFINAL is set. Makes compile tests quicker

_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))

# Step 2), invoke modpost

#  Includes step 3,4

modpost = scripts/mod/modpost                    \

 $(if $(CONFIG_MODVERSIONS),-m)                  \

 $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,)       \

 $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile)   \

 $(if $(KBUILD_EXTMOD),-I $(modulesymfile))      \

 $(if $(KBUILD_EXTMOD),-o $(modulesymfile))      \

 $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)

quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules

      cmd_modpost = $(modpost) -s

PHONY += __modpost

__modpost: $(modules:.ko=.o) FORCE

        $(call cmd,modpost) $(wildcard vmlinux) $(filter-out FORCE,$^)

quiet_cmd_kernel-mod = MODPOST $@

      cmd_kernel-mod = $(modpost) $@

vmlinux.o: FORCE

        $(call cmd,kernel-mod)

# Declare generated files as targets for modpost

$(symverfile):         __modpost ;

$(modules:.ko=.mod.c): __modpost ;

# Step 5), compile all *.mod.c files

# modname is set to make c_flags define KBUILD_MODNAME

modname = $(notdir $(@:.mod.o=))

quiet_cmd_cc_o_c = CC      $@

        cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE)  \

                   -c -o $@ $<

$(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE

        $(call if_changed_dep,cc_o_c)

targets += $(modules:.ko=.mod.o)

# Step 6), final link of the modules

quiet_cmd_ld_ko_o = LD [M]  $@

      cmd_ld_ko_o = $(LD) -r $(LDFLAGS) $(LDFLAGS_MODULE) -o $@         \

                          $(filter-out FORCE,$^)

$(modules): %.ko :%.o %.mod.o FORCE

        $(call if_changed,ld_ko_o)

targets += $(modules)

# Add FORCE to the prequisites of a target to force it to be always rebuilt.

# ---------------------------------------------------------------------------

PHONY += FORCE

FORCE:

# Read all saved command lines and dependencies for the $(targets) we

# may be building above, using $(if_changed{,_dep}). As an

# optimization, we don't need to read them if the target does not

# exist, we will rebuild anyway in that case.

targets := $(wildcard $(sort $(targets)))

cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)

  include $(cmd_files)

endif

# Declare the contents of the .PHONY variable as phony.  We keep that

# information in a variable se we can use it in if_changed and friends.

.PHONY: $(PHONY)