scripts/Makefile.modfinal

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 # ===========================================================================
   3 # Module final link
   4 # ===========================================================================
   5
   6 PHONY := __modfinal
   7 __modfinal:
   8
   9 include include/config/auto.conf
  10 include $(srctree)/scripts/Kbuild.include
  11
  12 # for c_flags
  13 include $(srctree)/scripts/Makefile.lib
  14
  15 # find all modules listed in modules.order
  16 modules := $(call read-file, $(MODORDER))
  17
  18 __modfinal: $(modules:%.o=%.ko)
  19         @:
  20
  21 # modname and part-of-module are set to make c_flags define proper module flags
  22 modname = $(notdir $(@:.mod.o=))
  23 part-of-module = y
  24
  25 quiet_cmd_cc_o_c = CC [M]  $@
  26       cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI) $(CFLAGS_GCOV) $(CFLAGS_KCSAN), $(c_flags)) -c -o $@ $<
  27
  28 %.mod.o: %.mod.c FORCE
  29         $(call if_changed_dep,cc_o_c)
  30
  31 quiet_cmd_ld_ko_o = LD [M]  $@
  32       cmd_ld_ko_o +=                                                    \
  33         $(LD) -r $(KBUILD_LDFLAGS)                                      \
  34                 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)              \
  35                 -T scripts/module.lds -o $@ $(filter %.o, $^)
  36
  37 quiet_cmd_btf_ko = BTF [M] $@
  38       cmd_btf_ko =                                                      \
  39         if [ ! -f vmlinux ]; then                                       \
  40                 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
  41         else                                                            \
  42                 LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
  43                 $(RESOLVE_BTFIDS) -b vmlinux $@;                        \
  44         fi;
  45
  46 # Same as newer-prereqs, but allows to exclude specified extra dependencies
  47 newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
  48
  49 # Same as if_changed, but allows to exclude specified extra dependencies
  50 if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check),      \
  51         $(cmd);                                                              \
  52         printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
  53
  54 # Re-generate module BTFs if either module's .ko or vmlinux changed
  55 %.ko: %.o %.mod.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE
  56         +$(call if_changed_except,ld_ko_o,vmlinux)
  57 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
  58         +$(if $(newer-prereqs),$(call cmd,btf_ko))
  59 endif
  60
  61 targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o)
  62
  63 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
  64 # ---------------------------------------------------------------------------
  65
  66 PHONY += FORCE
  67 FORCE:
  68
  69 # Read all saved command lines and dependencies for the $(targets) we
  70 # may be building above, using $(if_changed{,_dep}). As an
  71 # optimization, we don't need to read them if the target does not
  72 # exist, we will rebuild anyway in that case.
  73
  74 existing-targets := $(wildcard $(sort $(targets)))
  75
  76 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
  77
  78 .PHONY: $(PHONY)