1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun# 'info' prints the argument to stdout. 4*4882a593Smuzhiyun$(info,hello world 0) 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun# 'warning-if', if the first argument is y, sends the second argument to stderr, 7*4882a593Smuzhiyun# and the message is prefixed with the current file name and line number. 8*4882a593Smuzhiyun$(warning-if,y,hello world 1) 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun# 'error-if' is similar, but it terminates the parsing immediately. 11*4882a593Smuzhiyun# The following is just no-op since the first argument is not y. 12*4882a593Smuzhiyun$(error-if,n,this should not be printed) 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun# Shorthand 15*4882a593Smuzhiyunwarning = $(warning-if,y,$(1)) 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun# 'shell' executes a command, and returns its stdout. 18*4882a593Smuzhiyun$(warning,$(shell,echo hello world 3)) 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun# Every newline in the output is replaced with a space, 21*4882a593Smuzhiyun# but any trailing newlines are deleted. 22*4882a593Smuzhiyun$(warning,$(shell,printf 'hello\nworld\n\n4\n\n\n')) 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun# 'filename' is expanded to the currently parsed file name, 25*4882a593Smuzhiyun# 'lineno' to the line number. 26*4882a593Smuzhiyun$(warning,filename=$(filename)) 27*4882a593Smuzhiyun$(warning,lineno=$(lineno)) 28