LXR linux/scripts/Makefile.modfinal

   1# SPDX-License-Identifier: GPL-2.0-only
   2# ===========================================================================
   3# Module final link
   4# ===========================================================================
   5
   6PHONY := __modfinal
   7__modfinal:
   8
   9include include/config/auto.conf
  10include $(srctree)/scripts/Kbuild.include
  11
  12# for c_flags and objtool_args
  13include $(srctree)/scripts/Makefile.lib
  14
  15# find all modules listed in modules.order
  16modules := $(sort $(shell cat $(MODORDER)))
  17
  18__modfinal: $(modules)
  19        @:
  20
  21# modname and part-of-module are set to make c_flags define proper module flags
  22modname = $(notdir $(@:.mod.o=))
  23part-of-module = y
  24
  25quiet_cmd_cc_o_c = CC [M]  $@
  26      cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI), $(c_flags)) -c -o $@ $<
  27
  28%.mod.o: %.mod.c FORCE
  29        $(call if_changed_dep,cc_o_c)
  30
  31ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
  32
  33ifdef CONFIG_LTO_CLANG
  34# With CONFIG_LTO_CLANG, reuse the object file we compiled for modpost to
  35# avoid a second slow LTO link
  36prelink-ext := .lto
  37
  38# ELF processing was skipped earlier because we didn't have native code,
  39# so let's now process the prelinked binary before we link the module.
  40
  41ifdef CONFIG_STACK_VALIDATION
  42cmd_ld_ko_o +=                                                          \
  43        $(objtree)/tools/objtool/objtool $(objtool_args)                \
  44                $(@:.ko=$(prelink-ext).o);
  45
  46endif # CONFIG_STACK_VALIDATION
  47
  48endif # CONFIG_LTO_CLANG
  49
  50quiet_cmd_ld_ko_o = LD [M]  $@
  51      cmd_ld_ko_o +=                                                    \
  52        $(LD) -r $(KBUILD_LDFLAGS)                                      \
  53                $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)              \
  54                -T scripts/module.lds -o $@ $(filter %.o, $^);          \
  55        $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
  56
  57quiet_cmd_btf_ko = BTF [M] $@
  58      cmd_btf_ko =                                                      \
  59        if [ -f vmlinux ]; then                                         \
  60                LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J --btf_base vmlinux $@; \
  61        else                                                            \
  62                printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
  63        fi;
  64
  65# Same as newer-prereqs, but allows to exclude specified extra dependencies
  66newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
  67
  68# Same as if_changed, but allows to exclude specified extra dependencies
  69if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check),      \
  70        $(cmd);                                                              \
  71        printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
  72
  73
  74# Re-generate module BTFs if either module's .ko or vmlinux changed
  75$(modules): %.ko: %$(prelink-ext).o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
  76        +$(call if_changed_except,ld_ko_o,vmlinux)
  77ifdef CONFIG_DEBUG_INFO_BTF_MODULES
  78        +$(if $(newer-prereqs),$(call cmd,btf_ko))
  79endif
  80
  81targets += $(modules) $(modules:.ko=.mod.o)
  82
  83# Add FORCE to the prequisites of a target to force it to be always rebuilt.
  84# ---------------------------------------------------------------------------
  85
  86PHONY += FORCE
  87FORCE:
  88
  89# Read all saved command lines and dependencies for the $(targets) we
  90# may be building above, using $(if_changed{,_dep}). As an
  91# optimization, we don't need to read them if the target does not
  92# exist, we will rebuild anyway in that case.
  93
  94existing-targets := $(wildcard $(sort $(targets)))
  95
  96-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
  97
  98.PHONY: $(PHONY)
  99