mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
8402ee182c
After commit43fee2b238("kbuild: do not redirect the first prerequisite for filechk"), the rule is no longer automatically passed $< as stdin, so remove the stale comment. Fixes:43fee2b238("kbuild: do not redirect the first prerequisite for filechk") Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
323 lines
12 KiB
Text
323 lines
12 KiB
Text
# SPDX-License-Identifier: GPL-2.0
|
|
####
|
|
# kbuild: Generic definitions
|
|
|
|
# Convenient variables
|
|
comma := ,
|
|
quote := "
|
|
squote := '
|
|
empty :=
|
|
space := $(empty) $(empty)
|
|
space_escape := _-_SPACE_-_
|
|
pound := \#
|
|
|
|
###
|
|
# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
|
|
dot-target = $(dir $@).$(notdir $@)
|
|
|
|
###
|
|
# The temporary file to save gcc -MMD generated dependencies must not
|
|
# contain a comma
|
|
depfile = $(subst $(comma),_,$(dot-target).d)
|
|
|
|
###
|
|
# filename of target with directory and extension stripped
|
|
basetarget = $(basename $(notdir $@))
|
|
|
|
###
|
|
# real prerequisites without phony targets
|
|
real-prereqs = $(filter-out $(PHONY), $^)
|
|
|
|
###
|
|
# Escape single quote for use in echo statements
|
|
escsq = $(subst $(squote),'\$(squote)',$1)
|
|
|
|
###
|
|
# Quote a string to pass it to C files. foo => '"foo"'
|
|
stringify = $(squote)$(quote)$1$(quote)$(squote)
|
|
|
|
###
|
|
# Easy method for doing a status message
|
|
kecho := :
|
|
quiet_kecho := echo
|
|
silent_kecho := :
|
|
kecho := $($(quiet)kecho)
|
|
|
|
###
|
|
# filechk is used to check if the content of a generated file is updated.
|
|
# Sample usage:
|
|
#
|
|
# filechk_sample = echo $(KERNELRELEASE)
|
|
# version.h: FORCE
|
|
# $(call filechk,sample)
|
|
#
|
|
# The rule defined shall write to stdout the content of the new file.
|
|
# The existing file will be compared with the new one.
|
|
# - If no file exist it is created
|
|
# - If the content differ the new file is used
|
|
# - If they are equal no change, and no timestamp update
|
|
define filechk
|
|
$(Q)set -e; \
|
|
mkdir -p $(dir $@); \
|
|
trap "rm -f $(dot-target).tmp" EXIT; \
|
|
{ $(filechk_$(1)); } > $(dot-target).tmp; \
|
|
if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then \
|
|
$(kecho) ' UPD $@'; \
|
|
mv -f $(dot-target).tmp $@; \
|
|
fi
|
|
endef
|
|
|
|
######
|
|
# gcc support functions
|
|
# See documentation in Documentation/kbuild/makefiles.rst
|
|
|
|
# cc-cross-prefix
|
|
# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
|
|
# Return first <prefix> where a <prefix>gcc is found in PATH.
|
|
# If no gcc found in PATH with listed prefixes return nothing
|
|
#
|
|
# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
|
|
# would try to directly execute the shell builtin 'command'. This workaround
|
|
# should be kept for a long time since this issue was fixed only after the
|
|
# GNU Make 4.2.1 release.
|
|
cc-cross-prefix = $(firstword $(foreach c, $(1), \
|
|
$(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
|
|
|
|
# output directory for tests below
|
|
TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
|
|
|
|
# try-run
|
|
# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
|
|
# Exit code chooses option. "$$TMP" serves as a temporary file and is
|
|
# automatically cleaned up.
|
|
try-run = $(shell set -e; \
|
|
TMP=$(TMPOUT)/tmp; \
|
|
TMPO=$(TMPOUT)/tmp.o; \
|
|
mkdir -p $(TMPOUT); \
|
|
trap "rm -rf $(TMPOUT)" EXIT; \
|
|
if ($(1)) >/dev/null 2>&1; \
|
|
then echo "$(2)"; \
|
|
else echo "$(3)"; \
|
|
fi)
|
|
|
|
# as-option
|
|
# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
|
|
|
|
as-option = $(call try-run,\
|
|
$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
|
|
|
|
# as-instr
|
|
# Usage: cflags-y += $(call as-instr,instr,option1,option2)
|
|
|
|
as-instr = $(call try-run,\
|
|
printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
|
|
|
|
# __cc-option
|
|
# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
|
|
__cc-option = $(call try-run,\
|
|
$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
|
|
|
|
# cc-option
|
|
# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
|
|
|
|
cc-option = $(call __cc-option, $(CC),\
|
|
$(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
|
|
|
|
# cc-option-yn
|
|
# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
|
|
cc-option-yn = $(call try-run,\
|
|
$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
|
|
|
|
# cc-disable-warning
|
|
# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
|
|
cc-disable-warning = $(call try-run,\
|
|
$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
|
|
|
|
# cc-ifversion
|
|
# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
|
|
cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
|
|
|
|
# ld-option
|
|
# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
|
|
ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
|
|
|
|
# ld-version
|
|
# Note this is mainly for HJ Lu's 3 number binutil versions
|
|
ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
|
|
|
|
# ld-ifversion
|
|
# Usage: $(call ld-ifversion, -ge, 22252, y)
|
|
ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
|
|
|
|
######
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(build)=dir
|
|
build := -f $(srctree)/scripts/Makefile.build obj
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(dtbinst)=dir
|
|
dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
|
|
|
|
###
|
|
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
|
|
# Usage:
|
|
# $(Q)$(MAKE) $(clean)=dir
|
|
clean := -f $(srctree)/scripts/Makefile.clean obj
|
|
|
|
# echo command.
|
|
# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
|
|
echo-cmd = $(if $($(quiet)cmd_$(1)),\
|
|
echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
|
|
|
|
# printing commands
|
|
cmd = @set -e; $(echo-cmd) $(cmd_$(1))
|
|
|
|
###
|
|
# if_changed - execute command if any prerequisite is newer than
|
|
# target, or command line has changed
|
|
# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
|
|
# including used config symbols
|
|
# if_changed_rule - as if_changed but execute rule instead
|
|
# See Documentation/kbuild/makefiles.rst for more info
|
|
|
|
ifneq ($(KBUILD_NOCMDDEP),1)
|
|
# Check if both commands are the same including their order. Result is empty
|
|
# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
|
|
cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
|
|
$(subst $(space),$(space_escape),$(strip $(cmd_$1))))
|
|
else
|
|
cmd-check = $(if $(strip $(cmd_$@)),,1)
|
|
endif
|
|
|
|
# Replace >$< with >$$< to preserve $ when reloading the .cmd file
|
|
# (needed for make)
|
|
# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
|
|
# (needed for make)
|
|
# Replace >'< with >'\''< to be able to enclose the whole string in '...'
|
|
# (needed for the shell)
|
|
make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
|
|
|
|
# Find any prerequisites that are newer than target or that do not exist.
|
|
# (This is not true for now; $? should contain any non-existent prerequisites,
|
|
# but it does not work as expected when .SECONDARY is present. This seems a bug
|
|
# of GNU Make.)
|
|
# PHONY targets skipped in both cases.
|
|
newer-prereqs = $(filter-out $(PHONY),$?)
|
|
|
|
# Execute command if command has changed or prerequisite(s) are updated.
|
|
if_changed = $(if $(newer-prereqs)$(cmd-check), \
|
|
$(cmd); \
|
|
printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
|
|
|
|
# Execute the command and also postprocess generated .d dependencies file.
|
|
if_changed_dep = $(if $(newer-prereqs)$(cmd-check),$(cmd_and_fixdep),@:)
|
|
|
|
cmd_and_fixdep = \
|
|
$(cmd); \
|
|
scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
|
|
rm -f $(depfile)
|
|
|
|
# Usage: $(call if_changed_rule,foo)
|
|
# Will check if $(cmd_foo) or any of the prerequisites changed,
|
|
# and if so will execute $(rule_foo).
|
|
if_changed_rule = $(if $(newer-prereqs)$(cmd-check),$(rule_$(1)),@:)
|
|
|
|
###
|
|
# why - tell why a target got built
|
|
# enabled by make V=2
|
|
# Output (listed in the order they are checked):
|
|
# (1) - due to target is PHONY
|
|
# (2) - due to target missing
|
|
# (3) - due to: file1.h file2.h
|
|
# (4) - due to command line change
|
|
# (5) - due to missing .cmd file
|
|
# (6) - due to target not in $(targets)
|
|
# (1) PHONY targets are always build
|
|
# (2) No target, so we better build it
|
|
# (3) Prerequisite is newer than target
|
|
# (4) The command line stored in the file named dir/.target.cmd
|
|
# differed from actual command line. This happens when compiler
|
|
# options changes
|
|
# (5) No dir/.target.cmd file (used to store command line)
|
|
# (6) No dir/.target.cmd file and target not listed in $(targets)
|
|
# This is a good hint that there is a bug in the kbuild file
|
|
ifeq ($(KBUILD_VERBOSE),2)
|
|
why = \
|
|
$(if $(filter $@, $(PHONY)),- due to target is PHONY, \
|
|
$(if $(wildcard $@), \
|
|
$(if $(newer-prereqs),- due to: $(newer-prereqs), \
|
|
$(if $(cmd-check), \
|
|
$(if $(cmd_$@),- due to command line change, \
|
|
$(if $(filter $@, $(targets)), \
|
|
- due to missing .cmd file, \
|
|
- due to $(notdir $@) not in $$(targets) \
|
|
) \
|
|
) \
|
|
) \
|
|
), \
|
|
- due to target missing \
|
|
) \
|
|
)
|
|
|
|
echo-why = $(call escsq, $(strip $(why)))
|
|
endif
|
|
|
|
###############################################################################
|
|
#
|
|
# When a Kconfig string contains a filename, it is suitable for
|
|
# passing to shell commands. It is surrounded by double-quotes, and
|
|
# any double-quotes or backslashes within it are escaped by
|
|
# backslashes.
|
|
#
|
|
# This is no use for dependencies or $(wildcard). We need to strip the
|
|
# surrounding quotes and the escaping from quotes and backslashes, and
|
|
# we *do* need to escape any spaces in the string. So, for example:
|
|
#
|
|
# Usage: $(eval $(call config_filename,FOO))
|
|
#
|
|
# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
|
|
# transformed as described above to be suitable for use within the
|
|
# makefile.
|
|
#
|
|
# Also, if the filename is a relative filename and exists in the source
|
|
# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
|
|
# be prefixed to *both* command invocation and dependencies.
|
|
#
|
|
# Note: We also print the filenames in the quiet_cmd_foo text, and
|
|
# perhaps ought to have a version specially escaped for that purpose.
|
|
# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
|
|
# enough. It'll strip the quotes in the common case where there's no
|
|
# space and it's a simple filename, and it'll retain the quotes when
|
|
# there's a space. There are some esoteric cases in which it'll print
|
|
# the wrong thing, but we don't really care. The actual dependencies
|
|
# and commands *do* get it right, with various combinations of single
|
|
# and double quotes, backslashes and spaces in the filenames.
|
|
#
|
|
###############################################################################
|
|
#
|
|
define config_filename
|
|
ifneq ($$(CONFIG_$(1)),"")
|
|
$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
|
|
ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
|
|
else
|
|
ifeq ($$(wildcard $$($(1)_FILENAME)),)
|
|
ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
|
|
$(1)_SRCPREFIX := $(srctree)/
|
|
endif
|
|
endif
|
|
endif
|
|
endif
|
|
endef
|
|
#
|
|
###############################################################################
|
|
|
|
# delete partially updated (i.e. corrupted) files on error
|
|
.DELETE_ON_ERROR:
|
|
|
|
# do not delete intermediate files automatically
|
|
.SECONDARY:
|