diff options
Diffstat (limited to 'scripts/Makefile.modver')
| -rw-r--r-- | scripts/Makefile.modver | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/scripts/Makefile.modver b/scripts/Makefile.modver new file mode 100644 index 000000000000..0ee922a3aadf --- /dev/null +++ b/scripts/Makefile.modver @@ -0,0 +1,123 @@ +# =========================================================================== +# Module versions +# =========================================================================== + +src := $(obj) + +.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 +# --------------------------------------------------------------------------- + +MODVERDIR := include/linux/modules + +# +# 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__ + +c_flags = -Wp,-MD,$(depfile) $(CFLAGS) $(NOSTDINC_FLAGS) \ + $(modkern_cflags) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o) \ + -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) \ + $(export_flags) + +# Our objects only depend on modversions.h, not on the individual .ver +# files (fix-dep filters them), so touch modversions.h if any of the .ver +# files changes + +quiet_cmd_cc_ver_c = MKVER include/linux/modules/$*.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 |