1# SPDX-License-Identifier: GPL-2.0 2 3# 'info' prints the argument to stdout. 4$(info,hello world 0) 5 6# 'warning-if', if the first argument is y, sends the second argument to stderr, 7# and the message is prefixed with the current file name and line number. 8$(warning-if,y,hello world 1) 9 10# 'error-if' is similar, but it terminates the parsing immediately. 11# The following is just no-op since the first argument is not y. 12$(error-if,n,this should not be printed) 13 14# Shorthand 15warning = $(warning-if,y,$(1)) 16 17# 'shell' executes a command, and returns its stdout. 18$(warning,$(shell,echo hello world 3)) 19 20# Every newline in the output is replaced with a space, 21# but any trailing newlines are deleted. 22$(warning,$(shell,printf 'hello\nworld\n\n4\n\n\n')) 23 24# 'filename' is expanded to the currently parsed file name, 25# 'lineno' to the line number. 26$(warning,filename=$(filename)) 27$(warning,lineno=$(lineno)) 28