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Diffstat (limited to 'scripts/config/Kbuild.include')
| -rw-r--r-- | scripts/config/Kbuild.include | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/scripts/config/Kbuild.include b/scripts/config/Kbuild.include new file mode 100644 index 0000000000..7778cc97a4 --- /dev/null +++ b/scripts/config/Kbuild.include @@ -0,0 +1,279 @@ +# SPDX-License-Identifier: GPL-2.0 +#### +# kbuild: Generic definitions + +# Convenient variables +comma := , +quote := " +squote := ' +empty := +space := $(empty) $(empty) +space_escape := _-_SPACE_-_ +pound := \# +define newline + + +endef + +### +# Comparison macros. +# Usage: $(call test-lt, $(CONFIG_LLD_VERSION), 150000) +# +# Use $(intcmp ...) if supported. (Make >= 4.4) +# Otherwise, fall back to the 'test' shell command. +ifeq ($(intcmp 1,0,,,y),y) +test-ge = $(intcmp $(strip $1)0, $(strip $2)0,,y,y) +test-gt = $(intcmp $(strip $1)0, $(strip $2)0,,,y) +else +test-ge = $(shell test $(strip $1)0 -ge $(strip $2)0 && echo y) +test-gt = $(shell test $(strip $1)0 -gt $(strip $2)0 && echo y) +endif +test-le = $(call test-ge, $2, $1) +test-lt = $(call test-gt, $2, $1) + +### +# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o +dot-target = $(dir $@).$(notdir $@) + +### +# Name of target with a '.tmp_' as filename prefix. foo/bar.o => foo/.tmp_bar.o +tmp-target = $(dir $@).tmp_$(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) + +### +# The path to Kbuild or Makefile. Kbuild has precedence over Makefile. +kbuild-dir = $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) +kbuild-file = $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile) + +### +# Read a file, replacing newlines with spaces +# +# Make 4.2 or later can read a file by using its builtin function. +ifneq ($(filter-out 3.% 4.0 4.1, $(MAKE_VERSION)),) +read-file = $(subst $(newline),$(space),$(file < $1)) +else +read-file = $(shell cat $1 2>/dev/null) +endif + +### +# 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 + $(check-FORCE) + $(Q)set -e; \ + mkdir -p $(dir $@); \ + trap "rm -f $(tmp-target)" EXIT; \ + { $(filechk_$(1)); } > $(tmp-target); \ + if [ ! -r $@ ] || ! cmp -s $@ $(tmp-target); then \ + $(kecho) ' UPD $@'; \ + mv -f $(tmp-target) $@; \ + fi +endef + +### +# 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 + +# pring log +# +# If quiet is "silent_", print nothing and sink stdout +# If quiet is "quiet_", print short log +# If quiet is empty, print short log and whole command +silent_log_print = exec >/dev/null; + quiet_log_print = $(if $(quiet_cmd_$1), echo ' $(call escsq,$(quiet_cmd_$1)$(why))';) + log_print = echo '$(pound) $(call escsq,$(or $(quiet_cmd_$1),cmd_$1 $@)$(why))'; \ + echo ' $(call escsq,$(cmd_$1))'; + +# Delete the target on interruption +# +# GNU Make automatically deletes the target if it has already been changed by +# the interrupted recipe. So, you can safely stop the build by Ctrl-C (Make +# will delete incomplete targets), and resume it later. +# +# However, this does not work when the stderr is piped to another program, like +# $ make >&2 | tee log +# Make dies with SIGPIPE before cleaning the targets. +# +# To address it, we clean the target in signal traps. +# +# Make deletes the target when it catches SIGHUP, SIGINT, SIGQUIT, SIGTERM. +# So, we cover them, and also SIGPIPE just in case. +# +# Of course, this is unneeded for phony targets. +delete-on-interrupt = \ + $(if $(filter-out $(PHONY), $@), \ + $(foreach sig, HUP INT QUIT TERM PIPE, \ + trap 'rm -f $@; trap - $(sig); kill -s $(sig) $$$$' $(sig);)) + +# print and execute commands +cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_print) $(delete-on-interrupt) $(cmd_$(1)),:) + +### +# if_changed - execute command if any prerequisite is newer than +# target, or command line has changed +# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies +# including used config symbols +# if_changed_rule - as if_changed but execute rule instead +# See Documentation/kbuild/makefiles.rst for more info + +ifneq ($(KBUILD_NOCMDDEP),1) +# Check if both commands are the same including their order. Result is empty +# string if equal. User may override this check using make KBUILD_NOCMDDEP=1 +# If the target does not exist, the *.cmd file should not be included so +# $(savedcmd_$@) gets empty. Then, target will be built even if $(newer-prereqs) +# happens to become empty. +cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(savedcmd_$@))), \ + $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) +else +# We still need to detect missing targets. +cmd-check = $(if $(strip $(savedcmd_$@)),,1) +endif + +# Replace >$< with >$$< 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. +# PHONY targets skipped in both cases. +# If there is no prerequisite other than phony targets, $(newer-prereqs) becomes +# empty even if the target does not exist. cmd-check saves this corner case. +newer-prereqs = $(filter-out $(PHONY),$?) + +# It is a typical mistake to forget the FORCE prerequisite. Check it here so +# no more breakage will slip in. +check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing)) + +if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE) + +# Execute command if command has changed or prerequisite(s) are updated. +if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:) + +cmd_and_savecmd = \ + $(cmd); \ + printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd + +# Execute the command and also postprocess generated .d dependencies file. +if_changed_dep = $(if $(if-changed-cond),$(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 $(if-changed-cond),$(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 +ifneq ($(findstring 2, $(KBUILD_VERBOSE)),) +_why = \ + $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ + $(if $(wildcard $@), \ + $(if $(newer-prereqs),- due to: $(newer-prereqs), \ + $(if $(cmd-check), \ + $(if $(savedcmd_$@),- due to command line change, \ + $(if $(filter $@, $(targets)), \ + - due to missing .cmd file, \ + - due to $(notdir $@) not in $$(targets) \ + ) \ + ) \ + ) \ + ), \ + - due to target missing \ + ) \ + ) + +why = $(space)$(strip $(_why)) +endif + +############################################################################### + +# delete partially updated (i.e. corrupted) files on error +.DELETE_ON_ERROR: + +# do not delete intermediate files automatically +# +# .NOTINTERMEDIATE is more correct, but only available on newer Make versions. +# Make 4.4 introduced .NOTINTERMEDIATE, and it appears in .FEATURES, but the +# global .NOTINTERMEDIATE does not work. We can use it on Make > 4.4. +# Use .SECONDARY for older Make versions, but "newer-prereq" cannot detect +# deleted files. +ifneq ($(and $(filter notintermediate, $(.FEATURES)),$(filter-out 4.4,$(MAKE_VERSION))),) +.NOTINTERMEDIATE: +else +.SECONDARY: +endif |