[25.0 backport] Makefile: generate-files: fix check for empty TMP_OUT #47586
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commit c655b7d added a check to make sure the TMP_OUT variable was not set to an empty value, as such a situation would perform an `rm -rf /**` during cleanup. However, it was a bit too eager, because Makefile conditionals (`ifeq`) are evaluated when parsing the Makefile, which happens _before_ the make target is executed. As a result `$@_TMP_OUT` was always empty when the `ifeq` was evaluated, making it not possible to execute the `generate-files` target. This patch changes the check to use a shell command to evaluate if the var is set to an empty value. Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit 25c9e6e) Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
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backport: Makefile: generate-files: fix check for empty TMP_OUT #47569
relates to / introduced in Make sure that make doesn't rm -rf the system out of existence #47121
commit c655b7d added a check to make sure the TMP_OUT variable was not set to an empty value, as such a situation would perform an
rm -rf /**during cleanup.However, it was a bit too eager, because Makefile conditionals (
ifeq) are evaluated when parsing the Makefile, which happens before the make target is executed.As a result
$@_TMP_OUTwas always empty when theifeqwas evaluated, making it not possible to execute thegenerate-filestarget.This patch changes the check to use a shell command to evaluate if the var is set to an empty value.
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