e75d660672
Merge with latest Linus' tree, as I have incoming patches that fix code that is newer than current HEAD of for-next. Conflicts: drivers/net/ethernet/realtek/r8169.c
52 KiB
VERSION = 3 PATCHLEVEL = 4 SUBLEVEL = 0 EXTRAVERSION = -rc2 NAME = Saber-toothed Squirrel
DOCUMENTATION
To see a list of typical targets execute "make help"
More info can be located in ./README
Comments in this file are targeted only to the developer, do not
expect to learn how to build the kernel reading this file.
Do not:
o use make's built-in rules and variables
(this increases performance and avoids hard-to-debug behaviour);
o print "Entering directory ...";
MAKEFLAGS += -rR --no-print-directory
Avoid funny character set dependencies
unexport LC_ALL LC_COLLATE=C LC_NUMERIC=C export LC_COLLATE LC_NUMERIC
We are using a recursive build, so we need to do a little thinking
to get the ordering right.
Most importantly: sub-Makefiles should only ever modify files in
their own directory. If in some directory we have a dependency on
a file in another dir (which doesn't happen often, but it's often
unavoidable when linking the built-in.o targets which finally
turn into vmlinux), we will call a sub make in that other dir, and
after that we are sure that everything which is in that other dir
is now up to date.
The only cases where we need to modify files which have global
effects are thus separated out and done before the recursive
descending is started. They are now explicitly listed as the
prepare rule.
To put more focus on warnings, be less verbose as default
Use 'make V=1' to see the full commands
ifeq ("$(origin V)", "command line") KBUILD_VERBOSE = $(V) endif ifndef KBUILD_VERBOSE KBUILD_VERBOSE = 0 endif
Call a source code checker (by default, "sparse") as part of the
C compilation.
Use 'make C=1' to enable checking of only re-compiled files.
Use 'make C=2' to enable checking of all source files, regardless
of whether they are re-compiled or not.
See the file "Documentation/sparse.txt" for more details, including
where to get the "sparse" utility.
ifeq ("$(origin C)", "command line") KBUILD_CHECKSRC = $(C) endif ifndef KBUILD_CHECKSRC KBUILD_CHECKSRC = 0 endif
Use make M=dir to specify directory of external module to build
Old syntax make ... SUBDIRS=$PWD is still supported
Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS KBUILD_EXTMOD ?= $(SUBDIRS) endif
ifeq ("$(origin M)", "command line") KBUILD_EXTMOD := $(M) endif
kbuild supports saving output files in a separate directory.
To locate output files in a separate directory two syntaxes are supported.
In both cases the working directory must be the root of the kernel src.
1) O=
Use "make O=dir/to/store/output/files/"
2) Set KBUILD_OUTPUT
Set the environment variable KBUILD_OUTPUT to point to the directory
where the output files shall be placed.
export KBUILD_OUTPUT=dir/to/store/output/files/
make
The O= assignment takes precedence over the KBUILD_OUTPUT environment
variable.
KBUILD_SRC is set on invocation of make in OBJ directory
KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(KBUILD_SRC),)
OK, Make called in directory where kernel src resides
Do we want to locate output files in a separate directory?
ifeq ("$(origin O)", "command line") KBUILD_OUTPUT := $(O) endif
ifeq ("$(origin W)", "command line") export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W) endif
That's our default target when none is given on the command line
PHONY := _all _all:
Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;
ifneq ($(KBUILD_OUTPUT),)
Invoke a second make in the output directory, passing relevant variables
check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
$(if $(KBUILD_OUTPUT),,
$(error output directory "$(saved-output)" does not exist))
PHONY += $(MAKECMDGOALS) sub-make
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make $(Q)@:
sub-make: FORCE
$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT)
KBUILD_SRC=$(CURDIR)
KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile
$(filter-out _all sub-make,$(MAKECMDGOALS))
Leave processing to above invocation of make
skip-makefile := 1 endif # ifneq ($(KBUILD_OUTPUT),) endif # ifeq ($(KBUILD_SRC),)
We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)
If building an external module we do not care about the all: rule
but instead _all depend on modules
PHONY += all ifeq ($(KBUILD_EXTMOD),) _all: all else _all: modules endif
srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) objtree := $(CURDIR) src := $(srctree) obj := $(objtree)
VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
export srctree objtree VPATH
SUBARCH tells the usermode build what the underlying arch is. That is set
first, and if a usermode build is happening, the "ARCH=um" on the command
line overrides the setting of ARCH below. If a native build is happening,
then ARCH is assigned, getting whatever value it gets normally, and
SUBARCH is subsequently ignored.
SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/
-e s/arm./arm/ -e s/sa110/arm/
-e s/s390x/s390/ -e s/parisc64/parisc/
-e s/ppc./powerpc/ -e s/mips./mips/
-e s/sh[234]./sh/ )
Cross compiling and selecting different set of gcc/bin-utils
---------------------------------------------------------------------------
When performing cross compilation for other architectures ARCH shall be set
to the target architecture. (See arch/* for the possibilities).
ARCH can be set during invocation of make:
make ARCH=ia64
Another way is to have ARCH set in the environment.
The default ARCH is the host where make is executed.
CROSS_COMPILE specify the prefix used for all executables used
during compilation. Only gcc and related bin-utils executables
are prefixed with $(CROSS_COMPILE).
CROSS_COMPILE can be set on the command line
make CROSS_COMPILE=ia64-linux-
Alternatively CROSS_COMPILE can be set in the environment.
A third alternative is to store a setting in .config so that plain
"make" in the configured kernel build directory always uses that.
Default value for CROSS_COMPILE is not to prefix executables
Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
export KBUILD_BUILDHOST := $(SUBARCH) ARCH ?= $(SUBARCH) CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
Architecture as present in compile.h
UTS_MACHINE := $(ARCH) SRCARCH := $(ARCH)
Additional ARCH settings for x86
ifeq ($(ARCH),i386) SRCARCH := x86 endif ifeq ($(ARCH),x86_64) SRCARCH := x86 endif
Additional ARCH settings for sparc
ifeq ($(ARCH),sparc32) SRCARCH := sparc endif ifeq ($(ARCH),sparc64) SRCARCH := sparc endif
Additional ARCH settings for sh
ifeq ($(ARCH),sh64) SRCARCH := sh endif
Additional ARCH settings for tile
ifeq ($(ARCH),tilepro) SRCARCH := tile endif ifeq ($(ARCH),tilegx) SRCARCH := tile endif
Where to locate arch specific headers
hdr-arch := $(SRCARCH)
ifeq ($(ARCH),m68knommu) hdr-arch := m68k endif
KCONFIG_CONFIG ?= .config export KCONFIG_CONFIG
SHELL used by kbuild
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH;
else if [ -x /bin/bash ]; then echo /bin/bash;
else echo sh; fi ; fi)
HOSTCC = gcc HOSTCXX = g++ HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer HOSTCXXFLAGS = -O2
Decide whether to build built-in, modular, or both.
Normally, just do built-in.
KBUILD_MODULES := KBUILD_BUILTIN := 1
If we have only "make modules", don't compile built-in objects.
When we're building modules with modversions, we need to consider
the built-in objects during the descend as well, in order to
make sure the checksums are up to date before we record them.
ifeq ($(MAKECMDGOALS),modules) KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) endif
If we have "make modules", compile modules
in addition to whatever we do anyway.
Just "make" or "make all" shall build modules as well
ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) KBUILD_MODULES := 1 endif
ifeq ($(MAKECMDGOALS),) KBUILD_MODULES := 1 endif
export KBUILD_MODULES KBUILD_BUILTIN export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
Beautify output
---------------------------------------------------------------------------
Normally, we echo the whole command before executing it. By making
that echo $($(quiet)$(cmd)), we now have the possibility to set
$(quiet) to choose other forms of output instead, e.g.
quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
If $(quiet) is empty, the whole command will be printed.
If it is set to "quiet_", only the short version will be printed.
If it is set to "silent_", nothing will be printed at all, since
the variable $(silent_cmd_cc_o_c) doesn't exist.
A simple variant is to prefix commands with $(Q) - that's useful
for commands that shall be hidden in non-verbose mode.
$(Q)ln $@ :<
If KBUILD_VERBOSE equals 0 then the above command will be hidden.
If KBUILD_VERBOSE equals 1 then the above command is displayed.
ifeq ($(KBUILD_VERBOSE),1) quiet = Q = else quiet=quiet_ Q = @ endif
If the user is running make -s (silent mode), suppress echoing of
commands
ifneq ($(filter s% -s%,$(MAKEFLAGS)),) quiet=silent_ endif
export quiet Q KBUILD_VERBOSE
Look for make include files relative to root of kernel src
MAKEFLAGS += --include-dir=$(srctree)
We need some generic definitions (do not try to remake the file).
$(srctree)/scripts/Kbuild.include: ; include $(srctree)/scripts/Kbuild.include
Make variables (CC, etc...)
AS = $(CROSS_COMPILE)as LD = $(CROSS_COMPILE)ld CC = $(CROSS_COMPILE)gcc CPP = $(CC) -E AR = $(CROSS_COMPILE)ar NM = $(CROSS_COMPILE)nm STRIP = $(CROSS_COMPILE)strip OBJCOPY = $(CROSS_COMPILE)objcopy OBJDUMP = $(CROSS_COMPILE)objdump AWK = awk GENKSYMS = scripts/genksyms/genksyms INSTALLKERNEL := installkernel DEPMOD = /sbin/depmod KALLSYMS = scripts/kallsyms PERL = perl CHECK = sparse
CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
-Wbitwise -Wno-return-void $(CF)
CFLAGS_MODULE =
AFLAGS_MODULE =
LDFLAGS_MODULE =
CFLAGS_KERNEL =
AFLAGS_KERNEL =
CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
Use LINUXINCLUDE when you must reference the include/ directory.
Needed to be compatible with the O= option
LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include
-Iarch/$(hdr-arch)/include/generated -Iinclude
$(if $(KBUILD_SRC), -I$(srctree)/include)
-include $(srctree)/include/linux/kconfig.h
KBUILD_CPPFLAGS := -D__KERNEL__
KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing -fno-common
-Werror-implicit-function-declaration
-Wno-format-security
-fno-delete-null-pointer-checks
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
KBUILD_AFLAGS := -D__ASSEMBLY__
KBUILD_AFLAGS_MODULE := -DMODULE
KBUILD_CFLAGS_MODULE := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC export CPP AR NM STRIP OBJCOPY OBJDUMP export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL export KBUILD_ARFLAGS
When compiling out-of-tree modules, put MODVERDIR in the module
tree rather than in the kernel tree. The kernel tree might
even be read-only.
export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
Files to ignore in find ... statements
RCS_FIND_IGNORE := ( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS
-o -name .pc -o -name .hg -o -name .git ) -prune -o
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn
--exclude CVS --exclude .pc --exclude .hg --exclude .git
===========================================================================
Rules shared between *config targets and build targets
Basic helpers built in scripts/
PHONY += scripts_basic scripts_basic: $(Q)$(MAKE) $(build)=scripts/basic $(Q)rm -f .tmp_quiet_recordmcount
To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;
PHONY += outputmakefile
outputmakefile generates a Makefile in the output directory, if using a
separate output directory. This allows convenient use of make in the
output directory.
outputmakefile:
ifneq ($(KBUILD_SRC),)
$(Q)ln -fsn $(srctree) source
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile
$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
Support for using generic headers in asm-generic
PHONY += asm-generic
asm-generic:
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic
obj=arch/$(SRCARCH)/include/generated/asm
To make sure we do not include .config for any of the *config targets
catch them early, and hand them over to scripts/kconfig/Makefile
It is allowed to specify more targets when calling make, including
mixing *config targets and build targets.
For example 'make oldconfig all'.
Detect when mixed targets is specified, and make a second invocation
of make so .config is not included in this case either (for *config).
no-dot-config-targets := clean mrproper distclean
cscope gtags TAGS tags help %docs check% coccicheck
include/linux/version.h headers_% archheaders
kernelversion %src-pkg
config-targets := 0 mixed-targets := 0 dot-config := 1
ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) dot-config := 0 endif endif
ifeq ($(KBUILD_EXTMOD),) ifneq ($(filter config %config,$(MAKECMDGOALS)),) config-targets := 1 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) mixed-targets := 1 endif endif endif
ifeq ($(mixed-targets),1)
===========================================================================
We're called with mixed targets (*config and build targets).
Handle them one by one.
%:: FORCE $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
else ifeq ($(config-targets),1)
===========================================================================
*config targets only - make sure prerequisites are updated, and descend
in scripts/kconfig to make the *config target
Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
KBUILD_DEFCONFIG may point out an alternative default configuration
used for 'make defconfig'
include $(srctree)/arch/$(SRCARCH)/Makefile export KBUILD_DEFCONFIG KBUILD_KCONFIG
config: scripts_basic outputmakefile FORCE $(Q)mkdir -p include/linux include/config $(Q)$(MAKE) $(build)=scripts/kconfig $@
%config: scripts_basic outputmakefile FORCE $(Q)mkdir -p include/linux include/config $(Q)$(MAKE) $(build)=scripts/kconfig $@
else
===========================================================================
Build targets only - this includes vmlinux, arch specific targets, clean
targets and others. In general all targets except *config targets.
ifeq ($(KBUILD_EXTMOD),)
Additional helpers built in scripts/
Carefully list dependencies so we do not try to build scripts twice
in parallel
PHONY += scripts scripts: scripts_basic include/config/auto.conf include/config/tristate.conf $(Q)$(MAKE) $(build)=$(@)
Objects we will link into vmlinux / subdirs we need to visit
init-y := init/ drivers-y := drivers/ sound/ firmware/ net-y := net/ libs-y := lib/ core-y := usr/ endif # KBUILD_EXTMOD
ifeq ($(dot-config),1)
Read in config
-include include/config/auto.conf
ifeq ($(KBUILD_EXTMOD),)
Read in dependencies to all Kconfig* files, make sure to run
oldconfig if changes are detected.
-include include/config/auto.conf.cmd
To avoid any implicit rule to kick in, define an empty command
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
If .config is newer than include/config/auto.conf, someone tinkered
with it and forgot to run make oldconfig.
if auto.conf.cmd is missing then we are probably in a cleaned tree so
we execute the config step to be sure to catch updated Kconfig files
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig else
external modules needs include/generated/autoconf.h and include/config/auto.conf
but do not care if they are up-to-date. Use auto.conf to trigger the test
PHONY += include/config/auto.conf
include/config/auto.conf:
$(Q)test -e include/generated/autoconf.h -a -e $@ || (
echo;
echo " ERROR: Kernel configuration is invalid.";
echo " include/generated/autoconf.h or $@ are missing.";
echo " Run 'make oldconfig && make prepare' on kernel src to fix it.";
echo;
/bin/false)
endif # KBUILD_EXTMOD
else
Dummy target needed, because used as prerequisite
include/config/auto.conf: ; endif # $(dot-config)
The all: target is the default when no target is given on the
command line.
This allow a user to issue only 'make' to build a kernel including modules
Defaults to vmlinux, but the arch makefile usually adds further targets
all: vmlinux
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE KBUILD_CFLAGS += -Os else KBUILD_CFLAGS += -O2 endif
include $(srctree)/arch/$(SRCARCH)/Makefile
ifneq ($(CONFIG_FRAME_WARN),0) KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) endif
Force gcc to behave correct even for buggy distributions
ifndef CONFIG_CC_STACKPROTECTOR KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) endif
This warning generated too much noise in a regular build.
Use make W=1 to enable this warning (see scripts/Makefile.build)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls else
Some targets (ARM with Thumb2, for example), can't be built with frame
pointers. For those, we don't have FUNCTION_TRACER automatically
select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
incompatible with -fomit-frame-pointer with current GCC, so we don't use
-fomit-frame-pointer with FUNCTION_TRACER.
ifndef CONFIG_FUNCTION_TRACER KBUILD_CFLAGS += -fomit-frame-pointer endif endif
ifdef CONFIG_DEBUG_INFO KBUILD_CFLAGS += -g KBUILD_AFLAGS += -gdwarf-2 endif
ifdef CONFIG_DEBUG_INFO_REDUCED KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) endif
ifdef CONFIG_FUNCTION_TRACER KBUILD_CFLAGS += -pg ifdef CONFIG_DYNAMIC_FTRACE ifdef CONFIG_HAVE_C_RECORDMCOUNT BUILD_C_RECORDMCOUNT := y export BUILD_C_RECORDMCOUNT endif endif endif
We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) endif
arch Makefile may override CC so keep this after arch Makefile is included
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) CHECKFLAGS += $(NOSTDINC_FLAGS)
warn about C99 declaration after statement
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
disable pointer signed / unsigned warnings in gcc 4.0
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
conserve stack if available
KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)
check for 'asm goto'
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO endif
Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
But warn user when we do so
warn-assign =
$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
ifneq ($(KCPPFLAGS),) $(call warn-assign,CPPFLAGS) KBUILD_CPPFLAGS += $(KCPPFLAGS) endif ifneq ($(KAFLAGS),) $(call warn-assign,AFLAGS) KBUILD_AFLAGS += $(KAFLAGS) endif ifneq ($(KCFLAGS),) $(call warn-assign,CFLAGS) KBUILD_CFLAGS += $(KCFLAGS) endif
Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,
$(call cc-ldoption, -Wl$(comma)--build-id,))
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
ifeq ($(CONFIG_STRIP_ASM_SYMS),y) LDFLAGS_vmlinux += $(call ld-option, -X,) endif
Default kernel image to build when no specific target is given.
KBUILD_IMAGE may be overruled on the command line or
set in the environment
Also any assignments in arch/$(ARCH)/Makefile take precedence over
this default value
export KBUILD_IMAGE ?= vmlinux
INSTALL_PATH specifies where to place the updated kernel and system map
images. Default is /boot, but you can set it to other values
export INSTALL_PATH ?= /boot
INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
relocations required by build roots. This is not defined in the
makefile but the argument can be passed to make if needed.
MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) export MODLIB
INSTALL_MOD_STRIP, if defined, will cause modules to be
stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
the default option --strip-debug will be used. Otherwise,
INSTALL_MOD_STRIP value will be used as the options to the strip command.
ifdef INSTALL_MOD_STRIP ifeq ($(INSTALL_MOD_STRIP),1) mod_strip_cmd = $(STRIP) --strip-debug else mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) endif # INSTALL_MOD_STRIP=1 else mod_strip_cmd = true endif # INSTALL_MOD_STRIP export mod_strip_cmd
ifeq ($(KBUILD_EXTMOD),) core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m)
$(core-y) $(core-m) $(drivers-y) $(drivers-m)
$(net-y) $(net-m) $(libs-y) $(libs-m)))
vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/,
$(init-n) $(init-)
$(core-n) $(core-) $(drivers-n) $(drivers-)
$(net-n) $(net-) $(libs-n) $(libs-))))
init-y := $(patsubst %/, %/built-in.o, $(init-y)) core-y := $(patsubst %/, %/built-in.o, $(core-y)) drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) net-y := $(patsubst %/, %/built-in.o, $(net-y)) libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) libs-y := $(libs-y1) $(libs-y2)
Build vmlinux
---------------------------------------------------------------------------
vmlinux is built from the objects selected by $(vmlinux-init) and
$(vmlinux-main). Most are built-in.o files from top-level directories
in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
Ordering when linking is important, and $(vmlinux-init) must be first.
vmlinux
^
|
+-< $(vmlinux-init)
| +--< init/version.o + more
|
+--< $(vmlinux-main)
| +--< driver/built-in.o mm/built-in.o + more
|
+-< kallsyms.o (see description in CONFIG_KALLSYMS section)
vmlinux version (uname -v) cannot be updated during normal
descending-into-subdirs phase since we do not yet know if we need to
update vmlinux.
Therefore this step is delayed until just before final link of vmlinux -
except in the kallsyms case where it is done just before adding the
symbols to the kernel.
System.map is generated to document addresses of all kernel symbols
vmlinux-init := $(head-y) $(init-y) vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y) vmlinux-all := $(vmlinux-init) $(vmlinux-main) vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
Rule to link vmlinux - also used during CONFIG_KALLSYMS
May be overridden by arch/$(ARCH)/Makefile
quiet_cmd_vmlinux__ ?= LD $@
cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@
-T $(vmlinux-lds) $(vmlinux-init)
--start-group $(vmlinux-main) --end-group
$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
Generate new vmlinux version
quiet_cmd_vmlinux_version = GEN .version
cmd_vmlinux_version = set -e;
if [ ! -r .version ]; then
rm -f .version;
echo 1 >.version;
else
mv .version .old_version;
expr 0$$(cat .old_version) + 1 >.version;
fi;
$(MAKE) $(build)=init
Generate System.map
quiet_cmd_sysmap = SYSMAP cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
Link of vmlinux
If CONFIG_KALLSYMS is set .version is already updated
Generate System.map and verify that the content is consistent
Use + in front of the vmlinux_version rule to silent warning with make -j2
First command is ':' to allow us to use + in front of the rule
define rule_vmlinux__ : $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
$(call cmd,vmlinux__)
$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
$(Q)$(if $($(quiet)cmd_sysmap), \
echo ' $($(quiet)cmd_sysmap) System.map' &&) \
$(cmd_sysmap) $@ System.map; \
if [ $$? -ne 0 ]; then \
rm -f $@; \
/bin/false; \
fi;
$(verify_kallsyms)
endef
ifdef CONFIG_KALLSYMS
Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
It's a three stage process:
o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
empty
Running kallsyms on that gives us .tmp_kallsyms1.o with
the right size - vmlinux version (uname -v) is updated during this step
o .tmp_vmlinux2 now has a __kallsyms section of the right size,
but due to the added section, some addresses have shifted.
From here, we generate a correct .tmp_kallsyms2.o
o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
o Verify that the System.map from vmlinux matches the map from
.tmp_vmlinux2, just in case we did not generate kallsyms correctly.
o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
.tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
temporary bypass to allow the kernel to be built while the
maintainers work out what went wrong with kallsyms.
last_kallsyms := 2
ifdef KALLSYMS_EXTRA_PASS ifneq ($(KALLSYMS_EXTRA_PASS),0) last_kallsyms := 3 endif endif
kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
define verify_kallsyms
$(Q)$(if $($(quiet)cmd_sysmap),
echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&)
$(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
$(Q)cmp -s System.map .tmp_System.map ||
(echo Inconsistent kallsyms data;
echo This is a bug - please report about it;
echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround;
rm .tmp_kallsyms* ; /bin/false )
endef
Update vmlinux version before link
Use + in front of this rule to silent warning about make -j1
First command is ':' to allow us to use + in front of this rule
cmd_ksym_ld = $(cmd_vmlinux__) define rule_ksym_ld : +$(call cmd,vmlinux_version) $(call cmd,vmlinux__) $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd endef
Generate .S file with all kernel symbols
quiet_cmd_kallsyms = KSYM $@
cmd_kallsyms = $(NM) -n $< | $(KALLSYMS)
$(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE $(call if_changed_dep,as_o_S)
.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS) $(call cmd,kallsyms)
.tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE $(call if_changed_rule,ksym_ld)
.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE $(call if_changed,vmlinux__)
.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE $(call if_changed,vmlinux__)
Needs to visit scripts/ before $(KALLSYMS) can be used.
$(KALLSYMS): scripts ;
Generate some data for debugging strange kallsyms problems
debug_kallsyms: .tmp_map$(last_kallsyms)
.tmp_map%: .tmp_vmlinux% FORCE ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
.tmp_map3: .tmp_map2
.tmp_map2: .tmp_map1
endif # ifdef CONFIG_KALLSYMS
Do modpost on a prelinked vmlinux. The finally linked vmlinux has
relevant sections renamed as per the linker script.
quiet_cmd_vmlinux-modpost = LD $@
cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@
$(vmlinux-init) --start-group $(vmlinux-main) --end-group
$(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
define rule_vmlinux-modpost
:
+$(call cmd,vmlinux-modpost)
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
endef
vmlinux image - including updated kernel symbols
vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) 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 $(call vmlinux-modpost) $(call if_changed_rule,vmlinux__) $(Q)rm -f .old_version
build vmlinux.o first to catch section mismatch errors early
ifdef CONFIG_KALLSYMS .tmp_vmlinux1: vmlinux.o endif
modpost-init := $(filter-out init/built-in.o, $(vmlinux-init)) vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE $(call if_changed_rule,vmlinux-modpost)
The actual objects are generated when descending,
make sure no implicit rule kicks in
$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
Handle descending into subdirectories listed in $(vmlinux-dirs)
Preset locale variables to speed up the build process. Limit locale
tweaks to this spot to avoid wrong language settings when running
make menuconfig etc.
Error messages still appears in the original language
PHONY += $(vmlinux-dirs) $(vmlinux-dirs): prepare scripts $(Q)$(MAKE) $(build)=$@
Store (new) KERNELRELASE string in include/config/kernel.release
include/config/kernel.release: include/config/auto.conf FORCE $(Q)rm -f $@ $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
Things we need to do before we recursively start building the kernel
or the modules are listed in "prepare".
A multi level approach is used. prepareN is processed before prepareN-1.
archprepare is used in arch Makefiles and when processed asm symlink,
version.h and scripts_basic is processed / created.
Listed in dependency order
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
prepare3 is used to check if we are building in a separate output directory,
and if so do:
1) Check that make has not been executed in the kernel src $(srctree)
prepare3: include/config/kernel.release
ifneq ($(KBUILD_SRC),)
@$(kecho) ' Using $(srctree) as source for kernel'
$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then
echo " $(srctree) is not clean, please run 'make mrproper'";
echo " in the '$(srctree)' directory.";
/bin/false;
fi;
endif
prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile asm-generic
prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h
include/config/auto.conf
$(cmd_crmodverdir)
archprepare: archheaders prepare1 scripts_basic
prepare0: archprepare FORCE $(Q)$(MAKE) $(build)=.
All the preparing..
prepare: prepare0
Generate some files
---------------------------------------------------------------------------
KERNELRELEASE can change from a few different places, meaning version.h
needs to be updated, so this check is forced on all builds
uts_len := 64
define filechk_utsrelease.h
if [ echo -n "$(KERNELRELEASE)" | wc -c -gt $(uts_len) ]; then
echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;
exit 1;
fi;
(echo #define UTS_RELEASE "$(KERNELRELEASE)";)
endef
define filechk_version.h
(echo #define LINUX_VERSION_CODE $(shell
expr $(VERSION) * 65536 + 0$(PATCHLEVEL) * 256 + 0$(SUBLEVEL));
echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
endef
include/linux/version.h: $(srctree)/Makefile FORCE $(call filechk,version.h)
include/generated/utsrelease.h: include/config/kernel.release FORCE $(call filechk,utsrelease.h)
PHONY += headerdep
headerdep:
$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1
$(srctree)/scripts/headerdep.pl -I$(srctree)/include
---------------------------------------------------------------------------
PHONY += depend dep depend dep: @echo '*** Warning: make $@ is unnecessary now.'
---------------------------------------------------------------------------
Firmware install
INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware export INSTALL_FW_PATH
PHONY += firmware_install firmware_install: FORCE @mkdir -p $(objtree)/firmware $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
---------------------------------------------------------------------------
Kernel headers
#Default location for installed headers export INSTALL_HDR_PATH = $(objtree)/usr
hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
If we do an all arch process set dst to asm-$(hdr-arch)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
PHONY += archheaders archheaders:
PHONY += __headers __headers: include/linux/version.h scripts_basic asm-generic archheaders FORCE $(Q)$(MAKE) $(build)=scripts build_unifdef
PHONY += headers_install_all headers_install_all: $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
PHONY += headers_install
headers_install: __headers
$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),,
$(error Headers not exportable for the $(SRCARCH) architecture))
$(Q)$(MAKE) $(hdr-inst)=include
$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
PHONY += headers_check_all headers_check_all: headers_install_all $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
PHONY += headers_check headers_check: headers_install $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
---------------------------------------------------------------------------
Modules
ifdef CONFIG_MODULES
By default, build modules as well
all: modules
Build modules
A module can be listed more than once in obj-m resulting in
duplicate lines in modules.order files. Those are removed
using awk while concatenating to the final file.
PHONY += modules modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order @$(kecho) ' Building modules, stage 2.'; $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
%/modules.builtin: include/config/auto.conf $(Q)$(MAKE) $(modbuiltin)=$*
Target to prepare building external modules
PHONY += modules_prepare modules_prepare: prepare scripts
Target to install modules
PHONY += modules_install modules_install: modinst _modinst_post
PHONY += modinst
modinst:
@rm -rf $(MODLIB)/kernel
@rm -f $(MODLIB)/source
@mkdir -p $(MODLIB)/kernel
@ln -s $(srctree) $(MODLIB)/source
@if [ ! $(objtree) -ef $(MODLIB)/build ]; then
rm -f $(MODLIB)/build ;
ln -s $(objtree) $(MODLIB)/build ;
fi
@cp -f $(objtree)/modules.order $(MODLIB)/
@cp -f $(objtree)/modules.builtin $(MODLIB)/
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
This depmod is only for convenience to give the initial
boot a modules.dep even before / is mounted read-write. However the
boot script depmod is the master version.
PHONY += _modinst_post _modinst_post: modinst $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst $(call cmd,depmod)
else # CONFIG_MODULES
Modules not configured
---------------------------------------------------------------------------
modules modules_install: FORCE @echo @echo "The present kernel configuration has modules disabled." @echo "Type 'make config' and enable loadable module support." @echo "Then build a kernel with module support enabled." @echo @exit 1
endif # CONFIG_MODULES
Cleaning is done on three levels.
make clean Delete most generated files
Leave enough to build external modules
make mrproper Delete the current configuration, and all generated files
make distclean Remove editor backup files, patch leftover files and the like
Directories & files removed with 'make clean'
CLEAN_DIRS += $(MODVERDIR)
CLEAN_FILES += vmlinux System.map
.tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
Directories & files removed with 'make mrproper'
MRPROPER_DIRS += include/config usr/include include/generated
arch//include/generated
MRPROPER_FILES += .config .config.old .version .old_version
include/linux/version.h
Module.symvers tags TAGS cscope GPATH GTAGS GRTAGS GSYMS
clean - Delete most, but leave enough to build external modules
clean: rm-dirs := $(CLEAN_DIRS) clean: rm-files := $(CLEAN_FILES) clean-dirs := $(addprefix clean, . $(vmlinux-alldirs) Documentation samples)
PHONY += $(clean-dirs) clean archclean $(clean-dirs): $(Q)$(MAKE) $(clean)=$(patsubst clean%,%,$@)
clean: archclean
mrproper - Delete all generated files, including .config
mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) mrproper-dirs := $(addprefix mrproper,Documentation/DocBook scripts)
PHONY += $(mrproper-dirs) mrproper archmrproper $(mrproper-dirs): $(Q)$(MAKE) $(clean)=$(patsubst mrproper%,%,$@)
mrproper: clean archmrproper $(mrproper-dirs) $(call cmd,rmdirs) $(call cmd,rmfiles)
distclean
PHONY += distclean
distclean: mrproper
@find $(srctree) $(RCS_FIND_IGNORE)
( -name '.orig' -o -name '.rej' -o -name '~'
-o -name '.bak' -o -name '##' -o -name '..orig'
-o -name '..rej'
-o -name '%' -o -name '.*.cmd' -o -name 'core' )
-type f -print | xargs rm -f
Packaging of the kernel to various formats
---------------------------------------------------------------------------
rpm target kept for backward compatibility
package-dir := $(srctree)/scripts/package
%src-pkg: FORCE $(Q)$(MAKE) $(build)=$(package-dir) $@ %pkg: include/config/kernel.release FORCE $(Q)$(MAKE) $(build)=$(package-dir) $@ rpm: include/config/kernel.release FORCE $(Q)$(MAKE) $(build)=$(package-dir) $@
Brief documentation of the typical targets used
---------------------------------------------------------------------------
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/_defconfig) boards := $(notdir $(boards)) board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs//*_defconfig)) board-dirs := $(sort $(notdir $(board-dirs:/=)))
help:
@echo 'Cleaning targets:'
@echo ' clean - Remove most generated files but keep the config and'
@echo ' enough build support to build external modules'
@echo ' mrproper - Remove all generated files + config + various backup files'
@echo ' distclean - mrproper + remove editor backup and patch files'
@echo ''
@echo 'Configuration targets:'
@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
@echo ''
@echo 'Other generic targets:'
@echo ' all - Build all targets marked with []'
@echo ' vmlinux - Build the bare kernel'
@echo '* modules - Build all modules'
@echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
@echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
@echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
@echo ' dir/ - Build all files in dir and below'
@echo ' dir/file.[oisS] - Build specified target only'
@echo ' dir/file.lst - Build specified mixed source/assembly target only'
@echo ' (requires a recent binutils and recent build (System.map))'
@echo ' dir/file.ko - Build module including final link'
@echo ' modules_prepare - Set up for building external modules'
@echo ' tags/TAGS - Generate tags file for editors'
@echo ' cscope - Generate cscope index'
@echo ' gtags - Generate GNU GLOBAL index'
@echo ' kernelrelease - Output the release version string'
@echo ' kernelversion - Output the version stored in Makefile'
@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH';
echo ' (default: $(INSTALL_HDR_PATH))';
echo ''
@echo 'Static analysers'
@echo ' checkstack - Generate a list of stack hogs'
@echo ' namespacecheck - Name space analysis on compiled kernel'
@echo ' versioncheck - Sanity check on version.h usage'
@echo ' includecheck - Check for duplicate included header files'
@echo ' export_report - List the usages of all exported symbols'
@echo ' headers_check - Sanity check on exported headers'
@echo ' headerdep - Detect inclusion cycles in headers'
@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
@echo ''
@echo 'Kernel packaging:'
@$(MAKE) $(build)=$(package-dir) help
@echo ''
@echo 'Documentation targets:'
@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
@echo ''
@echo 'Architecture specific targets ($(SRCARCH)):'
@$(if $(archhelp),$(archhelp),
echo ' No architecture specific help defined for $(SRCARCH)')
@echo ''
@$(if $(boards),
$(foreach b, $(boards),
printf " %-24s - Build for %s\n" $(b) $(subst _defconfig,,$(b));)
echo '')
@$(if $(board-dirs),
$(foreach b, $(board-dirs),
printf " %-16s - Show %s-specific targets\n" help-$(b) $(b);)
printf " %-16s - Show all of the above\n" help-boards;
echo '')
@echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
@echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
@echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
@echo ' 1: warnings which may be relevant and do not occur too often'
@echo ' 2: warnings which occur quite often but may still be relevant'
@echo ' 3: more obscure warnings, can most likely be ignored'
@echo ' Multiple levels can be combined with W=12 or W=123'
@echo ''
@echo 'Execute "make" or "make all" to build all targets marked with [*] '
@echo 'For further info see the ./README file'
help-board-dirs := $(addprefix help-,$(board-dirs))
help-boards: $(help-board-dirs)
boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$/_defconfig))
$(help-board-dirs): help-%:
@echo 'Architecture specific targets ($(SRCARCH) $):'
@$(if $(boards-per-dir),
$(foreach b, $(boards-per-dir),
printf " %-24s - Build for %s\n" $/$(b) $(subst _defconfig,,$(b));)
echo '')
Documentation targets
---------------------------------------------------------------------------
%docs: scripts_basic FORCE $(Q)$(MAKE) $(build)=scripts build_docproc $(Q)$(MAKE) $(build)=Documentation/DocBook $@
else # KBUILD_EXTMOD
External module support.
When building external modules the kernel used as basis is considered
read-only, and no consistency checks are made and the make
system is not used on the basis kernel. If updates are required
in the basis kernel ordinary make commands (without M=...) must
be used.
The following are the only valid targets when building external
modules.
make M=dir clean Delete all automatically generated files
make M=dir modules Make all modules in specified dir
make M=dir Same as 'make M=dir modules'
make M=dir modules_install
Install the modules built in the module directory
Assumes install directory is already created
We are always building modules
KBUILD_MODULES := 1 PHONY += crmodverdir crmodverdir: $(cmd_crmodverdir)
PHONY += $(objtree)/Module.symvers
$(objtree)/Module.symvers:
@test -e $(objtree)/Module.symvers || (
echo;
echo " WARNING: Symbol version dump $(objtree)/Module.symvers";
echo " is missing; modules will have no dependencies and modversions.";
echo )
module-dirs := $(addprefix module,$(KBUILD_EXTMOD)) PHONY += $(module-dirs) modules $(module-dirs): crmodverdir $(objtree)/Module.symvers $(Q)$(MAKE) $(build)=$(patsubst module%,%,$@)
modules: $(module-dirs) @$(kecho) ' Building modules, stage 2.'; $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
PHONY += modules_install modules_install: emodinst _emodinst_post
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) PHONY += emodinst emodinst: $(Q)mkdir -p $(MODLIB)/$(install-dir) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
PHONY += _emodinst_post _emodinst_post: emodinst $(call cmd,depmod)
clean-dirs := $(addprefix clean,$(KBUILD_EXTMOD))
PHONY += $(clean-dirs) clean $(clean-dirs): $(Q)$(MAKE) $(clean)=$(patsubst clean%,%,$@)
clean: rm-dirs := $(MODVERDIR) clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
help: @echo ' Building external modules.' @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' @echo '' @echo ' modules - default target, build the module(s)' @echo ' modules_install - install the module' @echo ' clean - remove generated files in module directory only' @echo ''
Dummies...
PHONY += prepare scripts prepare: ; scripts: ; endif # KBUILD_EXTMOD
clean: $(clean-dirs)
$(call cmd,rmdirs)
$(call cmd,rmfiles)
@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE)
( -name '.[oas]' -o -name '.ko' -o -name '..cmd'
-o -name '..d' -o -name '..tmp' -o -name '.mod.c'
-o -name '.symtypes' -o -name 'modules.order'
-o -name modules.builtin -o -name '.tmp_.o.'
-o -name '.gcno' ) -type f -print | xargs rm -f
Generate tags for editors
---------------------------------------------------------------------------
quiet_cmd_tags = GEN $@ cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
tags TAGS cscope gtags: FORCE $(call cmd,tags)
Scripts to check various things for consistency
---------------------------------------------------------------------------
PHONY += includecheck versioncheck coccicheck namespacecheck export_report
includecheck:
find $(srctree)/* $(RCS_FIND_IGNORE)
-name '*.[hcS]' -type f -print | sort
| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
versioncheck:
find $(srctree)/* $(RCS_FIND_IGNORE)
-name '*.[hcS]' -type f -print | sort
| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
coccicheck: $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
namespacecheck: $(PERL) $(srctree)/scripts/namespace.pl
export_report: $(PERL) $(srctree)/scripts/export_report.pl
endif #ifeq ($(config-targets),1) endif #ifeq ($(mixed-targets),1)
PHONY += checkstack kernelrelease kernelversion
UML needs a little special treatment here. It wants to use the host
toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
else wants $(ARCH), including people doing cross-builds, which means
that $(SUBARCH) doesn't work here.
ifeq ($(ARCH), um)
CHECKSTACK_ARCH := $(SUBARCH)
else
CHECKSTACK_ARCH := $(ARCH)
endif
checkstack:
$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') |
$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
kernelrelease: @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
kernelversion: @echo $(KERNELVERSION)
Single targets
---------------------------------------------------------------------------
Single targets are compatible with:
- build with mixed source and output
- build with separate output dir 'make O=...'
- external modules
target-dir => where to store outputfile
build-dir => directory in kernel source tree to use
ifeq ($(KBUILD_EXTMOD),) build-dir = $(patsubst %/,%,$(dir $@)) target-dir = $(dir $@) else zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) endif
%.s: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.i: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.o: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.lst: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.s: %.S prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.o: %.S prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.symtypes: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Modules
/: prepare scripts FORCE
$(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)
$(build)=$(build-dir)
%/: prepare scripts FORCE
$(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)
$(build)=$(build-dir)
%.ko: prepare scripts FORCE
$(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)
$(build)=$(build-dir) $(@:.ko=.o)
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
FIXME Should go into a make.lib or something
===========================================================================
quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) cmd_rmdirs = rm -rf $(rm-dirs)
quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) cmd_rmfiles = rm -f $(rm-files)
Run depmod only if we have System.map and depmod is executable
quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD)
$(KERNELRELEASE)
Create temporary dir for module support files
clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR)
$(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL)
$(KBUILD_AFLAGS_KERNEL)
$(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS)
$(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
quiet_cmd_as_o_S = AS $@ cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
read all saved command lines
targets := $(wildcard $(sort $(targets))) cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
ifneq ($(cmd_files),) $(cmd_files): ; # Do not try to update included dependency files include $(cmd_files) endif
Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
Usage:
$(Q)$(MAKE) $(clean)=dir
clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
endif # skip-makefile
PHONY += FORCE FORCE:
Declare the contents of the .PHONY variable as phony. We keep that
information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)