diff options
Diffstat (limited to '')
| -rw-r--r-- | scripts/Makefile.modpost | 122 |
1 files changed, 79 insertions, 43 deletions
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index b4d3f2d122ac..e41dee64d429 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -13,7 +13,7 @@ # Stage 2 is handled by this file and does the following # 1) Find all modules listed in modules.order # 2) modpost is then used to -# 3) create one <module>.mod.c file pr. module +# 3) create one <module>.mod.c file per module # 4) create one Module.symvers file with CRC for all exported symbols # Step 3 is used to place certain information in the module's ELF @@ -32,44 +32,60 @@ # Step 4 is solely used to allow module versioning in external modules, # where the CRC of each module is retrieved from the Module.symvers 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 useful to speed up test compiles - PHONY := __modpost __modpost: include include/config/auto.conf -include scripts/Kbuild.include - -kernelsymfile := $(objtree)/Module.symvers -modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers - -MODPOST = scripts/mod/modpost \ - $(if $(CONFIG_MODVERSIONS),-m) \ - $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ - $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ - $(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \ - $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ - $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ - $(if $(KBUILD_MODPOST_WARN),-w) +include $(srctree)/scripts/Kbuild.include + +modpost-args = \ + $(if $(CONFIG_MODVERSIONS),-m) \ + $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ + $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ + $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \ + $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \ + -o $@ + +# 'make -i -k' ignores compile errors, and builds as many modules as possible. +ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) +modpost-args += -n +endif -ifdef MODPOST_VMLINUX +ifeq ($(KBUILD_EXTMOD),) -quiet_cmd_modpost = MODPOST vmlinux.o - cmd_modpost = $(MODPOST) vmlinux.o +# Generate the list of in-tree objects in vmlinux +# --------------------------------------------------------------------------- -__modpost: - $(call cmd,modpost) - -else +# This is used to retrieve symbol versions generated by genksyms. +ifdef CONFIG_MODVERSIONS +vmlinux.symvers Module.symvers: .vmlinux.objs +endif -MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - \ - $(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) +# Ignore libgcc.a +# Some architectures do '$(CC) --print-libgcc-file-name' to borrow libgcc.a +# from the toolchain, but there is no EXPORT_SYMBOL in it. + +quiet_cmd_vmlinux_objs = GEN $@ + cmd_vmlinux_objs = \ + for f in $(real-prereqs); do \ + case $${f} in \ + *libgcc.a) ;; \ + *) $(AR) t $${f} ;; \ + esac \ + done > $@ + +targets += .vmlinux.objs +.vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE + $(call if_changed,vmlinux_objs) + +vmlinux.o-if-present := $(wildcard vmlinux.o) +output-symdump := vmlinux.symvers + +ifdef KBUILD_MODULES +output-symdump := $(if $(vmlinux.o-if-present), Module.symvers, modules-only.symvers) +missing-input := $(filter-out $(vmlinux.o-if-present),vmlinux.o) +endif -ifeq ($(KBUILD_EXTMOD),) -MODPOST += $(wildcard vmlinux) else # set src + obj - they may be used in the modules's Makefile @@ -77,24 +93,44 @@ obj := $(KBUILD_EXTMOD) src := $(obj) # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS -include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ - $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) +include $(or $(wildcard $(src)/Kbuild), $(src)/Makefile) + +module.symvers-if-present := $(wildcard Module.symvers) +output-symdump := $(KBUILD_EXTMOD)/Module.symvers +missing-input := $(filter-out $(module.symvers-if-present), Module.symvers) + +modpost-args += -e $(addprefix -i ,$(module.symvers-if-present) $(KBUILD_EXTRA_SYMBOLS)) + +endif # ($(KBUILD_EXTMOD),) + +ifneq ($(KBUILD_MODPOST_WARN)$(missing-input),) +modpost-args += -w endif -# find all modules listed in modules.order -modules := $(sort $(shell cat $(MODORDER))) +modorder-if-needed := $(if $(KBUILD_MODULES), $(MODORDER)) + +MODPOST = scripts/mod/modpost -# Read out modules.order instead of expanding $(modules) to pass in modpost. +# Read out modules.order to pass in modpost. # Otherwise, allmodconfig would fail with "Argument list too long". -quiet_cmd_modpost = MODPOST $(words $(modules)) modules - cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST) +quiet_cmd_modpost = MODPOST $@ + cmd_modpost = \ + $(if $(missing-input), \ + echo >&2 "WARNING: $(missing-input) is missing."; \ + echo >&2 " Modules may not have dependencies or modversions."; \ + echo >&2 " You may get many unresolved symbol warnings.";) \ + sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) -T - $(vmlinux.o-if-present) -__modpost: - $(call cmd,modpost) -ifneq ($(KBUILD_MODPOST_NOFINAL),1) - $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal -endif +targets += $(output-symdump) +$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(module.symvers-if-present) $(MODPOST) FORCE + $(call if_changed,modpost) -endif +__modpost: $(output-symdump) +PHONY += FORCE +FORCE: + +existing-targets := $(wildcard $(sort $(targets))) + +-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) .PHONY: $(PHONY) |