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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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