diff options
Diffstat (limited to 'scripts/Kbuild.include')
| -rw-r--r-- | scripts/Kbuild.include | 316 |
1 files changed, 124 insertions, 192 deletions
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index f641bb0aa63f..7778cc97a4e0 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -10,13 +10,37 @@ 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 $@) ### -# The temporary file to save gcc -MD generated dependencies must not +# 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) @@ -33,6 +57,25 @@ real-prereqs = $(filter-out $(PHONY), $^) 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 @@ -52,117 +95,18 @@ kecho := $($(quiet)kecho) # - 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 -# - stdin is piped in from the first prerequisite ($<) so one has -# to specify a valid file as first prerequisite (often the kbuild file) define filechk - $(Q)set -e; \ - mkdir -p $(dir $@); \ - { $(filechk_$(1)); } > $@.tmp; \ - if [ -r $@ ] && cmp -s $@ $@.tmp; then \ - rm -f $@.tmp; \ - else \ - $(kecho) ' UPD $@'; \ - mv -f $@.tmp $@; \ + $(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 -###### -# gcc support functions -# See documentation in Documentation/kbuild/makefiles.txt - -# 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, $(filter-out -%, $(1)), \ - $(if $(shell command -v $(c)gcc 2>/dev/null), $(c)))) - -# output directory for tests below -TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) - -# 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).$$$$.tmp"; \ - TMPO="$(TMPOUT).$$$$.o"; \ - if ($(1)) >/dev/null 2>&1; \ - then echo "$(2)"; \ - else echo "$(3)"; \ - fi; \ - rm -f "$$TMP" "$$TMPO") - -# as-option -# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) - -as-option = $(call try-run,\ - $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$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)) - -# Do not attempt to build with gcc plugins during cc-option tests. -# (And this uses delayed resolution so the flags will be up to date.) -CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) - -# cc-option -# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) - -cc-option = $(call __cc-option, $(CC),\ - $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2)) - -# hostcc-option -# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586) -hostcc-option = $(call __cc-option, $(HOSTCC),\ - $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2)) - -# cc-option-yn -# Usage: flag := $(call cc-option-yn,-march=winchip-c6) -cc-option-yn = $(call try-run,\ - $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) - -# cc-disable-warning -# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) -cc-disable-warning = $(call try-run,\ - $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$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)) - -# ar-option -# Usage: KBUILD_ARFLAGS := $(call ar-option,D) -# Important: no spaces around options -ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) - -# 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: @@ -170,12 +114,6 @@ ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) build := -f $(srctree)/scripts/Makefile.build obj ### -# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= -# Usage: -# $(Q)$(MAKE) $(modbuiltin)=dir -modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj - -### # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= # Usage: # $(Q)$(MAKE) $(dtbinst)=dir @@ -187,22 +125,39 @@ dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj # $(Q)$(MAKE) $(clean)=dir clean := -f $(srctree)/scripts/Makefile.clean obj -### -# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj= -# Usage: -# $(Q)$(MAKE) $(hdr-inst)=dir -hdr-inst := -f $(srctree)/scripts/Makefile.headersinst 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)) +# 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) $$$$' $(sig);)) -# Add $(obj)/ for paths that are not absolute -objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) +# print and execute commands +cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_print) $(delete-on-interrupt) $(cmd_$(1)),:) ### # if_changed - execute command if any prerequisite is newer than @@ -210,15 +165,19 @@ objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies # including used config symbols # if_changed_rule - as if_changed but execute rule instead -# See Documentation/kbuild/makefiles.txt for more info +# See Documentation/kbuild/makefiles.rst for more info ifneq ($(KBUILD_NOCMDDEP),1) -# Check if both arguments are the same including their order. Result is empty +# Check if both commands are the same including their order. Result is empty # string if equal. User may override this check using make KBUILD_NOCMDDEP=1 -arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ +# If the target does not exist, the *.cmd file should not be included so +# $(savedcmd_$@) gets empty. Then, target will be built even if $(newer-prereqs) +# happens to become empty. +cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(savedcmd_$@))), \ $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) else -arg-check = $(if $(strip $(cmd_$@)),,1) +# We still need to detect missing targets. +cmd-check = $(if $(strip $(savedcmd_$@)),,1) endif # Replace >$< with >$$< to preserve $ when reloading the .cmd file @@ -229,17 +188,27 @@ endif # (needed for the shell) make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) -# Find any prerequisites that is newer than target or that does not exist. +# Find any prerequisites that are newer than target or that do not exist. # PHONY targets skipped in both cases. -any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) +# 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 $(strip $(any-prereq) $(arg-check)), \ +if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:) + +cmd_and_savecmd = \ $(cmd); \ - printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) + printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd # Execute the command and also postprocess generated .d dependencies file. -if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:) +if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:) cmd_and_fixdep = \ $(cmd); \ @@ -249,7 +218,7 @@ cmd_and_fixdep = \ # 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 $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:) +if_changed_rule = $(if $(if-changed-cond),$(rule_$(1)),@:) ### # why - tell why a target got built @@ -270,13 +239,13 @@ if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:) # (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 = \ +ifneq ($(findstring 2, $(KBUILD_VERBOSE)),) +_why = \ $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ $(if $(wildcard $@), \ - $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ - $(if $(arg-check), \ - $(if $(cmd_$@),- due to command line change, \ + $(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) \ @@ -288,60 +257,23 @@ why = \ ) \ ) -echo-why = $(call escsq, $(strip $(why))) +why = $(space)$(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 := $(srctree)/ -endif -endif -endif -endif -endef -# -############################################################################### # delete partially updated (i.e. corrupted) files on error .DELETE_ON_ERROR: # do not delete intermediate files automatically +# +# .NOTINTERMEDIATE is more correct, but only available on newer Make versions. +# Make 4.4 introduced .NOTINTERMEDIATE, and it appears in .FEATURES, but the +# global .NOTINTERMEDIATE does not work. We can use it on Make > 4.4. +# Use .SECONDARY for older Make versions, but "newer-prereq" cannot detect +# deleted files. +ifneq ($(and $(filter notintermediate, $(.FEATURES)),$(filter-out 4.4,$(MAKE_VERSION))),) +.NOTINTERMEDIATE: +else .SECONDARY: +endif |