| 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 |
| 15 | warning = $(warning-if,y,$(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)) |