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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354# SPDX-License-Identifier: GPL-2.0
# Shorthandwarning = $(warning-if,y,$(1))
# Simply expanded variable.X := 1SIMPLE := $(X)X := 2$(warning,SIMPLE = $(SIMPLE))
# Recursively expanded variable.X := 1RECURSIVE = $(X)X := 2$(warning,RECURSIVE = $(RECURSIVE))
# Append something to a simply expanded variable.Y := 3SIMPLE += $(Y)Y := 4$(warning,SIMPLE = $(SIMPLE))
# Append something to a recursively expanded variable.Y := 3RECURSIVE += $(Y)Y := 4$(warning,RECURSIVE = $(RECURSIVE))
# Use += operator to an undefined variable.# This works as a recursively expanded variable.Y := 3UNDEFINED_VARIABLE += $(Y)Y := 4$(warning,UNDEFINED_VARIABLE = $(UNDEFINED_VARIABLE))
# You can use variable references for the lefthand side of assignment statement.X := AY := B$(X)$(Y) := 5$(warning,AB = $(AB))
# User-defined function.greeting = $(1), my name is $(2).$(warning,$(greeting,Hello,John))
# The number of arguments is not checked for user-defined functions.# If some arguments are optional, it is useful to pass fewer parameters.# $(2) will be blank in this case.$(warning,$(greeting,Hello))
# Unreferenced parameters are just ignored.$(warning,$(greeting,Hello,John,ignored,ignored))