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Linux/scripts/kconfig/tests/preprocess/variable/Kconfig

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  1 # SPDX-License-Identifier: GPL-2.0
  2 
  3 # Shorthand
  4 warning = $(warning-if,y,$(1))
  5 
  6 # Simply expanded variable.
  7 X := 1
  8 SIMPLE := $(X)
  9 X := 2
 10 $(warning,SIMPLE = $(SIMPLE))
 11 
 12 # Recursively expanded variable.
 13 X := 1
 14 RECURSIVE = $(X)
 15 X := 2
 16 $(warning,RECURSIVE = $(RECURSIVE))
 17 
 18 # Append something to a simply expanded variable.
 19 Y := 3
 20 SIMPLE += $(Y)
 21 Y := 4
 22 $(warning,SIMPLE = $(SIMPLE))
 23 
 24 # Append something to a recursively expanded variable.
 25 Y := 3
 26 RECURSIVE += $(Y)
 27 Y := 4
 28 $(warning,RECURSIVE = $(RECURSIVE))
 29 
 30 # Use += operator to an undefined variable.
 31 # This works as a recursively expanded variable.
 32 Y := 3
 33 UNDEFINED_VARIABLE += $(Y)
 34 Y := 4
 35 $(warning,UNDEFINED_VARIABLE = $(UNDEFINED_VARIABLE))
 36 
 37 # You can use variable references for the lefthand side of assignment statement.
 38 X := A
 39 Y := B
 40 $(X)$(Y) := 5
 41 $(warning,AB = $(AB))
 42 
 43 # User-defined function.
 44 greeting = $(1), my name is $(2).
 45 $(warning,$(greeting,Hello,John))
 46 
 47 # The number of arguments is not checked for user-defined functions.
 48 # If some arguments are optional, it is useful to pass fewer parameters.
 49 # $(2) will be blank in this case.
 50 $(warning,$(greeting,Hello))
 51 
 52 # Unreferenced parameters are just ignored.
 53 $(warning,$(greeting,Hello,John,ignored,ignored))

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