45 lines
1.2 KiB
Plaintext
45 lines
1.2 KiB
Plaintext
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# SPDX-License-Identifier: GPL-2.0
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# Shorthand
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warning = $(warning-if,y,$(1))
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# You can not pass commas directly to a function since they are treated as
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# delimiters. You can use the following trick to do so.
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comma := ,
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$(warning,hello$(comma) world)
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# Like Make, single quotes, double quotes, spaces are treated verbatim.
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# The following prints the text as-is.
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$(warning, ' " '" ' ''' "'")
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# Unlike Make, '$' has special meaning only when it is followed by '('.
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# No need to escape '$' itself.
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$(warning,$)
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$(warning,$$)
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$ := 1
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$(warning,$($))
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# You need a trick to escape '$' followed by '('
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# The following should print "$(X)". It should not be expanded further.
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dollar := $
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$(warning,$(dollar)(X))
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# You need a trick to treat unbalanced parentheses.
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# The following should print "(".
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left_paren := (
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$(warning,$(left_paren))
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# A simple expanded should not be expanded multiple times.
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# The following should print "$(X)". It should not be expanded further.
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Y := $(dollar)(X)
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$(warning,$(Y))
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# The following should print "$(X)" as well.
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Y = $(dollar)(X)
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$(warning,$(Y))
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# The following should print "$(".
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# It should not be emit "unterminated reference" error.
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unterminated := $(dollar)(
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$(warning,$(unterminated))
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