Merge tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Remove potentially incomplete targets when Kbuid is interrupted by
   SIGINT etc in case GNU Make may miss to do that when stderr is piped
   to another program.

 - Rewrite the single target build so it works more correctly.

 - Fix rpm-pkg builds with V=1.

 - List top-level subdirectories in ./Kbuild.

 - Ignore auto-generated __kstrtab_* and __kstrtabns_* symbols in
   kallsyms.

 - Avoid two different modules in lib/zstd/ having shared code, which
   potentially causes building the common code as build-in and modular
   back-and-forth.

 - Unify two modpost invocations to optimize the build process.

 - Remove head-y syntax in favor of linker scripts for placing
   particular sections in the head of vmlinux.

 - Bump the minimal GNU Make version to 3.82.

 - Clean up misc Makefiles and scripts.

* tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (41 commits)
  docs: bump minimal GNU Make version to 3.82
  ia64: simplify esi object addition in Makefile
  Revert "kbuild: Check if linker supports the -X option"
  kbuild: rebuild .vmlinux.export.o when its prerequisite is updated
  kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o
  zstd: Fixing mixed module-builtin objects
  kallsyms: ignore __kstrtab_* and __kstrtabns_* symbols
  kallsyms: take the input file instead of reading stdin
  kallsyms: drop duplicated ignore patterns from kallsyms.c
  kbuild: reuse mksysmap output for kallsyms
  mksysmap: update comment about __crc_*
  kbuild: remove head-y syntax
  kbuild: use obj-y instead extra-y for objects placed at the head
  kbuild: hide error checker logs for V=1 builds
  kbuild: re-run modpost when it is updated
  kbuild: unify two modpost invocations
  kbuild: move vmlinux.o rule to the top Makefile
  kbuild: move .vmlinux.objs rule to Makefile.modpost
  kbuild: list sub-directories in ./Kbuild
  Makefile.compiler: replace cc-ifversion with compiler-specific macros
  ...

1 files changed, 52 insertions, 62 deletions

diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 911606496341..7740ce3b29e8 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -32,49 +32,58 @@
 # 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_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 $(srctree)/scripts/Kbuild.include
 
-MODPOST = scripts/mod/modpost								\
+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 $@
 
-ifdef MODPOST_VMLINUX
-
-quiet_cmd_modpost = MODPOST $@
-      cmd_modpost = $(MODPOST) $<
-
-vmlinux.symvers: vmlinux.o
-	$(call cmd,modpost)
-
-__modpost: vmlinux.symvers
-
-else
+# 'make -i -k' ignores compile errors, and builds as many modules as possible.
+ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
+modpost-args += -n
+endif
 
 ifeq ($(KBUILD_EXTMOD),)
 
-input-symdump := vmlinux.symvers
-output-symdump := modules-only.symvers
-
-quiet_cmd_cat = GEN     $@
-      cmd_cat = cat $(real-prereqs) > $@
+# Generate the list of in-tree objects in vmlinux
+# ---------------------------------------------------------------------------
 
-ifneq ($(wildcard vmlinux.symvers),)
-
-__modpost: Module.symvers
-Module.symvers: vmlinux.symvers modules-only.symvers FORCE
-	$(call if_changed,cat)
-
-targets += Module.symvers
+# This is used to retrieve symbol versions generated by genksyms.
+ifdef CONFIG_MODVERSIONS
+vmlinux.symvers Module.symvers: .vmlinux.objs
+endif
 
+# 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
 
 else
@@ -86,54 +95,37 @@ src := $(obj)
 # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
 include $(or $(wildcard $(src)/Kbuild), $(src)/Makefile)
 
-# modpost option for external modules
-MODPOST += -e
-
-input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS)
+module.symvers-if-present := $(wildcard Module.symvers)
 output-symdump := $(KBUILD_EXTMOD)/Module.symvers
+missing-input := $(filter-out $(module.symvers-if-present), Module.symvers)
 
-endif
-
-existing-input-symdump := $(wildcard $(input-symdump))
+modpost-args += -e $(addprefix -i ,$(module.symvers-if-present) $(KBUILD_EXTRA_SYMBOLS))
 
-# modpost options for modules (both in-kernel and external)
-MODPOST += \
-	$(addprefix -i ,$(existing-input-symdump)) \
-	$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
-	$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)
+endif # ($(KBUILD_EXTMOD),)
 
-# 'make -i -k' ignores compile errors, and builds as many modules as possible.
-ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
-MODPOST += -n
+ifneq ($(KBUILD_MODPOST_WARN)$(missing-input),)
+modpost-args += -w
 endif
 
-# Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree).
-VPATH :=
-$(input-symdump):
-	@echo >&2 'WARNING: Symbol version dump "$@" is missing.'
-	@echo >&2 '         Modules may not have dependencies or modversions.'
-	@echo >&2 '         You may get many unresolved symbol warnings.'
+modorder-if-needed := $(if $(KBUILD_MODULES), $(MODORDER))
 
-# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined symbols
-ifneq ($(KBUILD_MODPOST_WARN)$(filter-out $(existing-input-symdump), $(input-symdump)),)
-MODPOST += -w
-endif
+MODPOST = scripts/mod/modpost
 
 # Read out modules.order to pass in modpost.
 # Otherwise, allmodconfig would fail with "Argument list too long".
 quiet_cmd_modpost = MODPOST $@
-      cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T -
-
-$(output-symdump): $(MODORDER) $(input-symdump) FORCE
-	$(call if_changed,modpost)
+      cmd_modpost = \
+	$(if $(missing-input), \
+		echo >&2 "WARNING: $(missing-input) is missing."; \
+		echo >&2 "         Modules may not have dependencies or modversions."; \
+		echo >&2 "         You may get many unresolved symbol warnings.";) \
+	sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) $(vmlinux.o-if-present) -T -
 
 targets += $(output-symdump)
+$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(moudle.symvers-if-present) $(MODPOST) FORCE
+	$(call if_changed,modpost)
 
 __modpost: $(output-symdump)
-ifneq ($(KBUILD_MODPOST_NOFINAL),1)
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
-endif
-
 PHONY += FORCE
 FORCE:
 
@@ -141,6 +133,4 @@ existing-targets := $(wildcard $(sort $(targets)))
 
 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 
-endif
-
 .PHONY: $(PHONY)