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