28 lines
900 B
Plaintext
28 lines
900 B
Plaintext
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# SPDX-License-Identifier: GPL-2.0
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# 'info' prints the argument to stdout.
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$(info,hello world 0)
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# 'warning-if', if the first argument is y, sends the second argument to stderr,
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# and the message is prefixed with the current file name and line number.
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$(warning-if,y,hello world 1)
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# 'error-if' is similar, but it terminates the parsing immediately.
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# The following is just no-op since the first argument is not y.
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$(error-if,n,this should not be printed)
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# Shorthand
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warning = $(warning-if,y,$(1))
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# 'shell' executes a command, and returns its stdout.
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$(warning,$(shell,echo hello world 3))
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# Every newline in the output is replaced with a space,
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# but any trailing newlines are deleted.
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$(warning,$(shell,printf 'hello\nworld\n\n4\n\n\n'))
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# 'filename' is expanded to the currently parsed file name,
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# 'lineno' to the line number.
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$(warning,filename=$(filename))
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$(warning,lineno=$(lineno))
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