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, 17 insertions, 39 deletions

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 27be77c0d6d8..22adbf89cb31 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -5,8 +5,8 @@
 
 src := $(obj)
 
-PHONY := __build
-__build:
+PHONY := $(obj)/
+$(obj)/:
 
 # Init all relevant variables used in kbuild files so
 # 1) they have correct type
@@ -383,7 +383,7 @@ $(obj)/%.o: $(src)/%.S FORCE
 
 targets += $(filter-out $(subdir-builtin), $(real-obj-y))
 targets += $(filter-out $(subdir-modorder), $(real-obj-m))
-targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS)
+targets += $(real-dtb-y) $(lib-y) $(always-y)
 
 # Linker scripts preprocessor (.lds.S -> .lds)
 # ---------------------------------------------------------------------------
@@ -434,7 +434,7 @@ $(obj)/built-in.a: $(real-obj-y) FORCE
 
 cmd_modules_order = { $(foreach m, $(real-prereqs), \
 	$(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \
-	| $(AWK) '!x[$$0]++' - > $@
+	> $@
 
 $(obj)/modules.order: $(obj-m) FORCE
 	$(call if_changed,modules_order)
@@ -460,8 +460,6 @@ $(multi-obj-m): %.o: %.mod FORCE
 	$(call if_changed_rule,ld_multi_m)
 $(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
 
-targets := $(filter-out $(PHONY), $(targets))
-
 # Add intermediate targets:
 # When building objects with specific suffix patterns, add intermediate
 # targets that the final targets are derived from.
@@ -480,52 +478,29 @@ targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
 # Build
 # ---------------------------------------------------------------------------
 
-ifdef single-build
-
-KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS))
-
-curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
-			$(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x))))
-
-# Handle single targets without any rule: show "Nothing to be done for ..." or
-# "No rule to make target ..." depending on whether the target exists.
-unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
-			$(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
-
-single-subdirs := $(foreach d, $(subdir-ym), \
-			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
-
-__build: $(curdir-single) $(single-subdirs)
-ifneq ($(unknown-single),)
-	$(Q)$(MAKE) -f /dev/null $(unknown-single)
-endif
+$(obj)/: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
+	 $(if $(KBUILD_MODULES), $(targets-for-modules)) \
+	 $(subdir-ym) $(always-y)
 	@:
 
-ifeq ($(curdir-single),)
-# Nothing to do in this directory. Do not include any .*.cmd file for speed-up
-targets :=
-else
-targets += $(curdir-single)
-endif
+# Single targets
+# ---------------------------------------------------------------------------
 
-else
+single-subdirs := $(foreach d, $(subdir-ym), $(if $(filter $d/%, $(MAKECMDGOALS)), $d))
+single-subdir-goals := $(filter $(addsuffix /%, $(single-subdirs)), $(MAKECMDGOALS))
 
-__build: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
-	 $(if $(KBUILD_MODULES), $(targets-for-modules)) \
-	 $(subdir-ym) $(always-y)
+$(single-subdir-goals): $(single-subdirs)
 	@:
 
-endif
-
 # Descending
 # ---------------------------------------------------------------------------
 
 PHONY += $(subdir-ym)
 $(subdir-ym):
 	$(Q)$(MAKE) $(build)=$@ \
-	$(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \
 	need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
-	need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1)
+	need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \
+	$(filter $@/%, $(single-subdir-goals))
 
 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
 # ---------------------------------------------------------------------------
@@ -534,6 +509,9 @@ PHONY += FORCE
 
 FORCE:
 
+targets += $(filter-out $(single-subdir-goals), $(MAKECMDGOALS))
+targets := $(filter-out $(PHONY), $(targets))
+
 # 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