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Commit 5b26fc88 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 

Pull kbuild updates from Michal Marek:

 - new option CONFIG_TRIM_UNUSED_KSYMS which does a two-pass build and
   unexports symbols which are not used in the current config [Nicolas
   Pitre]

 - several kbuild rule cleanups [Masahiro Yamada]

 - warning option adjustments for gcov etc [Arnd Bergmann]

 - a few more small fixes

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (31 commits)
  kbuild: move -Wunused-const-variable to W=1 warning level
  kbuild: fix if_change and friends to consider argument order
  kbuild: fix adjust_autoksyms.sh for modules that need only one symbol
  kbuild: fix ksym_dep_filter when multiple EXPORT_SYMBOL() on the same line
  gcov: disable -Wmaybe-uninitialized warning
  gcov: disable tree-loop-im to reduce stack usage
  gcov: disable for COMPILE_TEST
  Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL_BRANCHES
  Kbuild: change CC_OPTIMIZE_FOR_SIZE definition
  kbuild: forbid kernel directory to contain spaces and colons
  kbuild: adjust ksym_dep_filter for some cmd_* renames
  kbuild: Fix dependencies for final vmlinux link
  kbuild: better abstract vmlinux sequential prerequisites
  kbuild: fix call to adjust_autoksyms.sh when output directory specified
  kbuild: Get rid of KBUILD_STR
  kbuild: rename cmd_as_s_S to cmd_cpp_s_S
  kbuild: rename cmd_cc_i_c to cmd_cpp_i_c
  kbuild: drop redundant "PHONY += FORCE"
  kbuild: delete unnecessary "@:"
  kbuild: mark help target as PHONY
  ...
parents e12fab28 c9c6837d

Makefile

+47 −19
Original line number Diff line number Diff line
@@ -128,6 +128,10 @@ _all: 
# Cancel implicit rules on top Makefile

$(CURDIR)/Makefile Makefile: ;



ifneq ($(words $(subst :, ,$(CURDIR))), 1)

  $(error main directory cannot contain spaces nor colons)

endif



ifneq ($(KBUILD_OUTPUT),)

# Invoke a second make in the output directory, passing relevant variables

# check that the output directory actually exists
@@ -142,7 +146,7 @@ PHONY += $(MAKECMDGOALS) sub-make 
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make

	@:



sub-make: FORCE

sub-make:

	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \

	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
@@ -364,7 +368,7 @@ AFLAGS_MODULE = 
LDFLAGS_MODULE  =

CFLAGS_KERNEL	=

AFLAGS_KERNEL	=

CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage

CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized

CFLAGS_KCOV	= -fsanitize-coverage=trace-pc
@@ -617,8 +621,12 @@ KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE

KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)

else

ifdef CONFIG_PROFILE_ALL_BRANCHES

KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)

else

KBUILD_CFLAGS   += -O2

endif

endif



# Tell gcc to never replace conditional load with a non-conditional one

KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
@@ -697,9 +705,10 @@ KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)

else



# This warning generated too much noise in a regular build.

# Use make W=1 to enable this warning (see scripts/Makefile.build)

# These warnings generated too much noise in a regular build.

# Use make W=1 to enable them (see scripts/Makefile.build)

KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)

KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)

endif



ifdef CONFIG_FRAME_POINTER
@@ -926,27 +935,41 @@ export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Doc 


vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)



# Final link of vmlinux

      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)

quiet_cmd_link-vmlinux = LINK    $@



# Include targets which we want to

# execute if the rest of the kernel build went well.

vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE

# Include targets which we want to execute sequentially if the rest of the

# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be

# evaluated more than once.

PHONY += vmlinux_prereq

vmlinux_prereq: $(vmlinux-deps) FORCE

ifdef CONFIG_HEADERS_CHECK

	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check

endif

ifdef CONFIG_SAMPLES

	$(Q)$(MAKE) $(build)=samples

endif

ifdef CONFIG_BUILD_DOCSRC

	$(Q)$(MAKE) $(build)=Documentation

endif

ifdef CONFIG_GDB_SCRIPTS

	$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py

endif

ifdef CONFIG_TRIM_UNUSED_KSYMS

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \

	  "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"

endif



# standalone target for easier testing

include/generated/autoksyms.h: FORCE

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true



# Final link of vmlinux

      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)

quiet_cmd_link-vmlinux = LINK    $@



vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE

	+$(call if_changed,link-vmlinux)



# Build samples along the rest of the kernel

ifdef CONFIG_SAMPLES

vmlinux-dirs += samples

endif



# The actual objects are generated when descending,

# make sure no implicit rule kicks in

$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
@@ -998,10 +1021,12 @@ prepare2: prepare3 outputmakefile asm-generic 
prepare1: prepare2 $(version_h) include/generated/utsrelease.h \

                   include/config/auto.conf

	$(cmd_crmodverdir)

	$(Q)test -e include/generated/autoksyms.h || \

	    touch   include/generated/autoksyms.h



archprepare: archheaders archscripts prepare1 scripts_basic



prepare0: archprepare FORCE

prepare0: archprepare

	$(Q)$(MAKE) $(build)=.



# All the preparing..
@@ -1061,7 +1086,7 @@ INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 
export INSTALL_FW_PATH



PHONY += firmware_install

firmware_install: FORCE

firmware_install:

	@mkdir -p $(objtree)/firmware

	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
@@ -1081,7 +1106,7 @@ PHONY += archscripts 
archscripts:



PHONY += __headers

__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE

__headers: $(version_h) scripts_basic asm-generic archheaders archscripts

	$(Q)$(MAKE) $(build)=scripts build_unifdef



PHONY += headers_install_all
@@ -1192,7 +1217,8 @@ else # CONFIG_MODULES 
# Modules not configured

# ---------------------------------------------------------------------------



modules modules_install: FORCE

PHONY += modules modules_install

modules modules_install:

	@echo >&2

	@echo >&2 "The present kernel configuration has modules disabled."

	@echo >&2 "Type 'make config' and enable loadable module support."
@@ -1283,6 +1309,7 @@ boards := $(sort $(notdir $(boards))) 
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))

board-dirs := $(sort $(notdir $(board-dirs:/=)))



PHONY += help

help:

	@echo  'Cleaning targets:'

	@echo  '  clean		  - Remove most generated files but keep the config and'
@@ -1453,6 +1480,7 @@ $(clean-dirs): 
clean:	rm-dirs := $(MODVERDIR)

clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers



PHONY += help

help:

	@echo  '  Building external modules.'

	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'

arch/arm/boot/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -82,7 +82,6 @@ $(obj)/uImage: $(obj)/zImage FORCE 


$(obj)/bootp/bootp: $(obj)/zImage initrd FORCE

	$(Q)$(MAKE) $(build)=$(obj)/bootp $@

	@:



$(obj)/bootpImage: $(obj)/bootp/bootp FORCE

	$(call if_changed,objcopy)

arch/arm/boot/bootp/Makefile

+1 −2
Original line number Diff line number Diff line
@@ -17,7 +17,6 @@ targets := bootp init.o kernel.o initrd.o 
# Note that bootp.lds picks up kernel.o and initrd.o

$(obj)/bootp:	$(src)/bootp.lds $(addprefix $(obj)/,init.o kernel.o initrd.o) FORCE

	$(call if_changed,ld)

	@:



# kernel.o and initrd.o includes a binary image using

# .incbin, a dependency which is not tracked automatically
@@ -26,4 +25,4 @@ $(obj)/kernel.o: arch/arm/boot/zImage FORCE 


$(obj)/initrd.o: $(INITRD) FORCE



PHONY += $(INITRD) FORCE
 
PHONY += $(INITRD)

arch/arm/vdso/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -74,5 +74,5 @@ $(MODLIB)/vdso: FORCE 
	@mkdir -p $(MODLIB)/vdso



PHONY += vdso_install

vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso FORCE

vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso

	$(call cmd,vdso_install)

arch/h8300/boot/compressed/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -23,7 +23,6 @@ LDFLAGS_vmlinux := -Ttext $(IMAGE_OFFSET) -estartup -T $(obj)/vmlinux.lds \ 


$(obj)/vmlinux: $(OBJECTS) $(obj)/piggy.o $(LIBGCC) FORCE

	$(call if_changed,ld)

	@:



$(obj)/vmlinux.bin: vmlinux FORCE

	$(call if_changed,objcopy)