Merge tag 'kbuild-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - add modpost warn exported symbols marked as 'static' because 'static'
   and EXPORT_SYMBOL is an odd combination

 - break the build early if gold linker is used

 - optimize the Bison rule to produce .c and .h files by a single
   pattern rule

 - handle PREEMPT_RT in the module vermagic and UTS_VERSION

 - warn CONFIG options leaked to the user-space except existing ones

 - make single targets work properly

 - rebuild modules when module linker scripts are updated

 - split the module final link stage into scripts/Makefile.modfinal

 - fix the missed error code in merge_config.sh

 - improve the error message displayed on the attempt of the O= build in
   unclean source tree

 - remove 'clean-dirs' syntax

 - disable -Wimplicit-fallthrough warning for Clang

 - add CONFIG_CC_OPTIMIZE_FOR_SIZE_O3 for ARC

 - remove ARCH_{CPP,A,C}FLAGS variables

 - add $(BASH) to run bash scripts

 - change *CFLAGS_<basetarget>.o to take the relative path to $(obj)
   instead of the basename

 - stop suppressing Clang's -Wunused-function warnings when W=1

 - fix linux/export.h to avoid genksyms calculating CRC of trimmed
   exported symbols

 - misc cleanups

* tag 'kbuild-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (63 commits)
  genksyms: convert to SPDX License Identifier for lex.l and parse.y
  modpost: use __section in the output to *.mod.c
  modpost: use MODULE_INFO() for __module_depends
  export.h, genksyms: do not make genksyms calculate CRC of trimmed symbols
  export.h: remove defined(__KERNEL__), which is no longer needed
  kbuild: allow Clang to find unused static inline functions for W=1 build
  kbuild: rename KBUILD_ENABLE_EXTRA_GCC_CHECKS to KBUILD_EXTRA_WARN
  kbuild: refactor scripts/Makefile.extrawarn
  merge_config.sh: ignore unwanted grep errors
  kbuild: change *FLAGS_<basetarget>.o to take the path relative to $(obj)
  modpost: add NOFAIL to strndup
  modpost: add guid_t type definition
  kbuild: add $(BASH) to run scripts with bash-extension
  kbuild: remove ARCH_{CPP,A,C}FLAGS
  kbuild,arc: add CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 for ARC
  kbuild: Do not enable -Wimplicit-fallthrough for clang for now
  kbuild: clean up subdir-ymn calculation in Makefile.clean
  kbuild: remove unneeded '+' marker from cmd_clean
  kbuild: remove clean-dirs syntax
  kbuild: check clean srctree even earlier
  ...

drivers/gpu/drm/amd/display/dc/calcs/Makefile

@@ -36,9 +36,9 @@ ifdef CONFIG_CC_IS_CLANG
 calcs_ccflags += -msse2
 endif
 
-CFLAGS_dcn_calcs.o := $(calcs_ccflags)
-CFLAGS_dcn_calc_auto.o := $(calcs_ccflags)
-CFLAGS_dcn_calc_math.o := $(calcs_ccflags) -Wno-tautological-compare
+CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calcs.o := $(calcs_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calc_auto.o := $(calcs_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calc_math.o := $(calcs_ccflags) -Wno-tautological-compare
 
 BW_CALCS = dce_calcs.o bw_fixed.o custom_float.o
 

drivers/gpu/drm/amd/display/dc/dcn20/Makefile

@@ -16,10 +16,10 @@ else ifneq ($(call cc-option, -mstack-alignment=16),)
 	cc_stack_align := -mstack-alignment=16
 endif
 
-CFLAGS_dcn20_resource.o := -mhard-float -msse $(cc_stack_align)
+CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -mhard-float -msse $(cc_stack_align)
 
 ifdef CONFIG_CC_IS_CLANG
-CFLAGS_dcn20_resource.o += -msse2
+CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o += -msse2
 endif
 
 AMD_DAL_DCN20 = $(addprefix $(AMDDALPATH)/dc/dcn20/,$(DCN20))

drivers/gpu/drm/amd/display/dc/dcn21/Makefile

@@ -3,7 +3,7 @@
 
 DCN21 = dcn21_hubp.o dcn21_hubbub.o dcn21_resource.o
 
-CFLAGS_dcn21_resource.o := -mhard-float -msse -mpreferred-stack-boundary=4
+CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse -mpreferred-stack-boundary=4
 
 AMD_DAL_DCN21 = $(addprefix $(AMDDALPATH)/dc/dcn21/,$(DCN21))
 

drivers/gpu/drm/amd/display/dc/dml/Makefile

@@ -36,25 +36,22 @@ ifdef CONFIG_CC_IS_CLANG
 dml_ccflags += -msse2
 endif
 
-CFLAGS_display_mode_lib.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_lib.o := $(dml_ccflags)
 
 ifdef CONFIG_DRM_AMD_DC_DCN2_0
-CFLAGS_display_mode_vba.o := $(dml_ccflags)
-CFLAGS_display_mode_vba_20.o := $(dml_ccflags)
-CFLAGS_display_rq_dlg_calc_20.o := $(dml_ccflags)
-CFLAGS_display_mode_vba_20v2.o := $(dml_ccflags)
-CFLAGS_display_rq_dlg_calc_20v2.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_vba.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_rq_dlg_calc_20.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20v2.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_rq_dlg_calc_20v2.o := $(dml_ccflags)
 endif
 ifdef CONFIG_DRM_AMD_DC_DCN2_1
-CFLAGS_display_mode_vba_21.o := $(dml_ccflags)
-CFLAGS_display_rq_dlg_calc_21.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn21/display_mode_vba_21.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn21/display_rq_dlg_calc_21.o := $(dml_ccflags)
 endif
-ifdef CONFIG_DRM_AMD_DCN3AG
-CFLAGS_display_mode_vba_3ag.o := $(dml_ccflags)
-endif
-CFLAGS_dml1_display_rq_dlg_calc.o := $(dml_ccflags)
-CFLAGS_display_rq_dlg_helpers.o := $(dml_ccflags)
-CFLAGS_dml_common_defs.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dml1_display_rq_dlg_calc.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/display_rq_dlg_helpers.o := $(dml_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml/dml_common_defs.o := $(dml_ccflags)
 
 DML = display_mode_lib.o display_rq_dlg_helpers.o dml1_display_rq_dlg_calc.o \
 	dml_common_defs.o

drivers/gpu/drm/amd/display/dc/dsc/Makefile

@@ -13,10 +13,9 @@ ifdef CONFIG_CC_IS_CLANG
 dsc_ccflags += -msse2
 endif
 
-CFLAGS_rc_calc.o := $(dsc_ccflags)
-CFLAGS_rc_calc_dpi.o := $(dsc_ccflags)
-CFLAGS_codec_main_amd.o := $(dsc_ccflags)
-CFLAGS_dc_dsc.o := $(dsc_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dsc/rc_calc.o := $(dsc_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dsc/rc_calc_dpi.o := $(dsc_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dsc/dc_dsc.o := $(dsc_ccflags)
 
 DSC = dc_dsc.o rc_calc.o rc_calc_dpi.o