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