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|
# ===========================================================================
# Module versions
# ===========================================================================
src := $(obj)
MODVERDIR := include/linux/modules
.PHONY: modver
modver:
include .config
include $(obj)/Makefile
include scripts/Makefile.lib
# ===========================================================================
ifeq ($(strip $(export-objs)),)
# If we don't export any symbols in this dir, just descend
# ---------------------------------------------------------------------------
modver: $(subdir-ym)
@:
else
# This sets version suffixes on exported symbols
# ---------------------------------------------------------------------------
#
# Added the SMP separator to stop module accidents between uniprocessor
# and SMP Intel boxes - AC - from bits by Michael Chastain
#
ifdef CONFIG_SMP
genksyms_smp_prefix := -p smp_
else
genksyms_smp_prefix :=
endif
# Don't include modversions.h, we're just about to generate it here.
CFLAGS_MODULE := $(filter-out -include include/linux/modversions.h,$(CFLAGS_MODULE))
$(addprefix $(MODVERDIR)/,$(real-objs-y:.o=.ver)): modkern_cflags := $(CFLAGS_KERNEL)
$(addprefix $(MODVERDIR)/,$(real-objs-m:.o=.ver)): modkern_cflags := $(CFLAGS_MODULE)
$(addprefix $(MODVERDIR)/,$(export-objs:.o=.ver)): export_flags := -D__GENKSYMS__
# Default for not multi-part modules
modname = $(*F)
$(addprefix $(MODVERDIR)/,$(multi-objs:.o=.ver)) : modname = $(modname-multi)
# Our objects only depend on modversions.h, not on the individual .ver
# files (fix-dep filters them), so touch modversions.h if any of the .ver
# files changes
quiet_cmd_cc_ver_c = MKVER include/linux/modules/$*.ver
cmd_cc_ver_c = $(CPP) $(c_flags) $< | $(GENKSYMS) $(genksyms_smp_prefix) \
-k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp
# Okay, let's explain what's happening in rule_make_cc_ver_c:
# o echo the command
# o execute the command
# o If the $(CPP) fails, we won't notice because it's output is piped
# to $(GENKSYMS) which does not fail. We recognize this case by
# looking if the generated $(depfile) exists, though.
# o If the .ver file changed, touch modversions.h, which is our marker
# of any changed .ver files.
# o Move command line and deps into their normal .*.cmd place.
define rule_cc_ver_c
$(if $($(quiet)cmd_cc_ver_c),echo ' $($(quiet)cmd_cc_ver_c)';) \
$(cmd_cc_ver_c); \
if [ ! -r $(depfile) ]; then exit 1; fi; \
scripts/fixdep $(depfile) $@ '$(cmd_cc_ver_c)' > $(@D)/.$(@F).tmp; \
rm -f $(depfile); \
if [ ! -r $@ ] || cmp -s $@ $@.tmp; then \
touch include/linux/modversions.h; \
fi; \
mv -f $@.tmp $@
mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
endef
targets := $(addprefix $(MODVERDIR)/,$(export-objs:.o=.ver))
$(MODVERDIR)/%.ver: %.c FORCE
@$(call if_changed_rule,cc_ver_c)
modver: $(targets) $(subdir-ym)
@mkdir -p $(dir $(addprefix .tmp_export-objs/modules/,$(export-objs:.o=.ver)))
@touch $(addprefix .tmp_export-objs/modules/,$(export-objs:.o=.ver))
endif # export-objs
# Descending
# ---------------------------------------------------------------------------
.PHONY: $(subdir-ym)
$(subdir-ym):
$(Q)$(MAKE) -f scripts/Makefile.modver obj=$@
# 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
|
