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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200# This allows us to work with the newline character:define newline
endefnewline := $(newline)
# nl-escape## Usage: escape = $(call nl-escape[,escape])## This is used as the common way to specify# what should replace a newline when escaping# newlines; the default is a bizarre string.#nl-escape = $(if $(1),$(1),m822df3020w6a44id34bt574ctac44eb9f4n)
# escape-nl## Usage: escaped-text = $(call escape-nl,text[,escape])## GNU make's $(shell ...) function converts to a# single space each newline character in the output# produced during the expansion; this may not be# desirable.## The only solution is to change each newline into# something that won't be converted, so that the# information can be recovered later with# $(call unescape-nl...)#escape-nl = $(subst $(newline),$(call nl-escape,$(2)),$(1))
# unescape-nl## Usage: text = $(call unescape-nl,escaped-text[,escape])## See escape-nl.#unescape-nl = $(subst $(call nl-escape,$(2)),$(newline),$(1))
# shell-escape-nl## Usage: $(shell some-command | $(call shell-escape-nl[,escape]))## Use this to escape newlines from within a shell call;# the default escape is a bizarre string.## NOTE: The escape is used directly as a string constant# in an `awk' program that is delimited by shell# single-quotes, so be wary of the characters# that are chosen.#define shell-escape-nlawk 'NR==1 {t=$$0} NR>1 {t=t "$(nl-escape)" $$0} END {printf t}'endef
# shell-unescape-nl## Usage: $(shell some-command | $(call shell-unescape-nl[,escape]))## Use this to unescape newlines from within a shell call;# the default escape is a bizarre string.## NOTE: The escape is used directly as an extended regular# expression constant in an `awk' program that is# delimited by shell single-quotes, so be wary# of the characters that are chosen.## (The bash shell has a bug where `{gsub(...),...}' is# misinterpreted as a brace expansion; this can be# overcome by putting a space between `{' and `gsub').#define shell-unescape-nlawk 'NR==1 {t=$$0} NR>1 {t=t "\n" $$0} END { gsub(/$(nl-escape)/,"\n",t); printf t }'endef
# escape-for-shell-sq## Usage: embeddable-text = $(call escape-for-shell-sq,text)## This function produces text that is suitable for# embedding in a shell string that is delimited by# single-quotes.#escape-for-shell-sq = $(subst ','\'',$(1))
# shell-sq## Usage: single-quoted-and-escaped-text = $(call shell-sq,text)#shell-sq = '$(escape-for-shell-sq)'
# shell-wordify## Usage: wordified-text = $(call shell-wordify,text)## For instance:## |define text# |hello# |world# |endef# |# |target:# | echo $(call shell-wordify,$(text))## At least GNU make gets confused by expanding a newline# within the context of a command line of a makefile rule# (this is in constrast to a `$(shell ...)' function call,# which can handle it just fine).## This function avoids the problem by producing a string# that works as a shell word, regardless of whether or# not it contains a newline.## If the text to be wordified contains a newline, then# an intrictate shell command substitution is constructed# to render the text as a single line; when the shell# processes the resulting escaped text, it transforms# it into the original unescaped text.## If the text does not contain a newline, then this function# produces the same results as the `$(shell-sq)' function.#shell-wordify = $(if $(findstring $(newline),$(1)),$(_sw-esc-nl),$(shell-sq))define _sw-esc-nl"$$(echo $(call escape-nl,$(shell-sq),$(2)) | $(call shell-unescape-nl,$(2)))"endef
# is-absolute## Usage: bool-value = $(call is-absolute,path)#is-absolute = $(shell echo $(shell-sq) | grep -q ^/ && echo y)
# lookup## Usage: absolute-executable-path-or-empty = $(call lookup,path)## (It's necessary to use `sh -c' because GNU make messes up by# trying too hard and getting things wrong).#lookup = $(call unescape-nl,$(shell sh -c $(_l-sh)))_l-sh = $(call shell-sq,command -v $(shell-sq) | $(call shell-escape-nl,))
# is-executable## Usage: bool-value = $(call is-executable,path)## (It's necessary to use `sh -c' because GNU make messes up by# trying too hard and getting things wrong).#is-executable = $(call _is-executable-helper,$(shell-sq))_is-executable-helper = $(shell sh -c $(_is-executable-sh))_is-executable-sh = $(call shell-sq,test -f $(1) -a -x $(1) && echo y)
# get-executable## Usage: absolute-executable-path-or-empty = $(call get-executable,path)## The goal is to get an absolute path for an executable;# the `command -v' is defined by POSIX, but it's not# necessarily very portable, so it's only used if# relative path resolution is requested, as determined# by the presence of a leading `/'.#get-executable = $(if $(1),$(if $(is-absolute),$(_ge-abspath),$(lookup)))_ge-abspath = $(if $(is-executable),$(1))
# get-supplied-or-default-executable## Usage: absolute-executable-path-or-empty = $(call get-executable-or-default,variable,default)#define get-executable-or-default$(if $($(1)),$(call _ge_attempt,$($(1)),$(1)),$(call _ge_attempt,$(2)))endef_ge_attempt = $(or $(get-executable),$(call _gea_err,$(2)))_gea_err = $(if $(1),$(error Please set '$(1)' appropriately))
# version-ge3## Usage $(call version-ge3,2.6.4,$(FLEX_VERSION))## To compare if a 3 component version is greater or equal to another, first use# was to check the flex version to see if we can use compiler warnings as# errors for one of the cases flex generates code C compilers complains about.
version-ge3 = $(shell echo "$(1).$(2)" | awk -F'.' '{ printf("%d\n", (10000000 * $$1 + 10000 * $$2 + $$3) >= (10000000 * $$4 + 10000 * $$5 + $$6)) }')
# version-lt3## Usage $(call version-lt3,2.6.2,$(FLEX_VERSION))## To compare if a 3 component version is less thjan another, first use was to# check the flex version to see if we can use compiler warnings as errors for# one of the cases flex generates code C compilers complains about.
version-lt3 = $(shell echo "$(1).$(2)" | awk -F'.' '{ printf("%d\n", (10000000 * $$1 + 10000 * $$2 + $$3) < (10000000 * $$4 + 10000 * $$5 + $$6)) }')