Merge tag 'kbuild-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:
 "Kbuild core:
   - remove unneeded $(call cc-option,...) switches
   - consolidate Clang compiler flags into CLANG_FLAGS
   - announce the deprecation of SUBDIRS
   - fix single target build for external module
   - simplify the dependencies of 'prepare' stage targets
   - allow fixdep to directly write to .*.cmd files
   - simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS
   - change if_changed_rule to accept multi-line recipe
   - move .SECONDARY special target to scripts/Kbuild.include
   - remove redundant 'set -e'
   - improve parallel execution for CONFIG_HEADERS_CHECK
   - misc cleanups

  Treewide fixes and cleanups
   - set Clang flags correctly for PowerPC boot images
   - fix UML build error with CONFIG_GCC_PLUGINS
   - remove unneeded patterns from .gitignore files
   - refactor firmware/Makefile
   - remove unneeded rules for *offsets.s
   - avoid unneeded regeneration of intermediate .s files
   - clean up ./Kbuild

  Modpost:
   - remove unused -M, -K options
   - fix false positive warnings about section mismatch
   - use simple devtable lookup instead of linker magic
   - misc cleanups

  Coccinelle:
   - relax boolinit.cocci checks for overall consistency
   - fix warning messages of boolinit.cocci

  Other tools:
   - improve -dirty check of scripts/setlocalversion
   - add a tool to generate compile_commands.json from .*.cmd files"

* tag 'kbuild-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (51 commits)
  kbuild: remove unused cmd_gentimeconst
  kbuild: remove $(obj)/ prefixes in ./Kbuild
  treewide: add intermediate .s files to targets
  treewide: remove explicit rules for *offsets.s
  firmware: refactor firmware/Makefile
  firmware: remove unnecessary patterns from .gitignore
  scripts: remove unnecessary ihex2fw and check-lc_ctypes from .gitignore
  um: remove unused filechk_gen_header in Makefile
  scripts: add a tool to produce a compile_commands.json file
  kbuild: add -Werror=implicit-int flag unconditionally
  kbuild: add -Werror=strict-prototypes flag unconditionally
  kbuild: add -fno-PIE flag unconditionally
  scripts: coccinelle: Correct warning message
  scripts: coccinelle: only suggest true/false in files that already use them
  kbuild: handle part-of-module correctly for *.ll and *.symtypes
  kbuild: refactor part-of-module
  kbuild: refactor quiet_modtag
  kbuild: remove redundant quiet_modtag for $(obj-m)
  kbuild: refactor Makefile.asm-generic
  user/Makefile: Fix typo and capitalization in comment section
  ...

1 files changed, 5 insertions, 16 deletions

diff --git a/Kbuild b/Kbuild
index 005304205482..414ae6da1f50 100644
--- a/Kbuild
+++ b/Kbuild
@@ -16,11 +16,7 @@ bounds-file := include/generated/bounds.h
 always  := $(bounds-file)
 targets := kernel/bounds.s
 
-# We use internal kbuild rules to avoid the "is up to date" message from make
-kernel/bounds.s: kernel/bounds.c FORCE
-	$(call if_changed_dep,cc_s_c)
-
-$(obj)/$(bounds-file): kernel/bounds.s FORCE
+$(bounds-file): kernel/bounds.s FORCE
 	$(call filechk,offsets,__LINUX_BOUNDS_H__)
 
 #####
@@ -30,15 +26,11 @@ timeconst-file := include/generated/timeconst.h
 
 targets += $(timeconst-file)
 
-quiet_cmd_gentimeconst = GEN     $@
-define cmd_gentimeconst
-	(echo $(CONFIG_HZ) | bc -q $< ) > $@
-endef
 define filechk_gentimeconst
 	(echo $(CONFIG_HZ) | bc -q $< )
 endef
 
-$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
+$(timeconst-file): kernel/time/timeconst.bc FORCE
 	$(call filechk,gentimeconst)
 
 #####
@@ -50,12 +42,9 @@ offsets-file := include/generated/asm-offsets.h
 always  += $(offsets-file)
 targets += arch/$(SRCARCH)/kernel/asm-offsets.s
 
-# We use internal kbuild rules to avoid the "is up to date" message from make
-arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
-                                      $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
-	$(call if_changed_dep,cc_s_c)
+arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file)
 
-$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
+$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
 	$(call filechk,offsets,__ASM_OFFSETS_H__)
 
 #####
@@ -77,7 +66,7 @@ missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
 
 extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py
 
-build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file)
+build_constants_py: $(timeconst-file) $(bounds-file)
 	@$(MAKE) $(build)=scripts/gdb/linux $@
 
 # Keep these three files during make clean