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