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H A DMakefile6363325c77066920e5867795c4c52cf1583ee62f Thu Sep 19 11:44:47 UTC 2019 Jerome Forissier <jerome@forissier.org> Makefile: add .DELETE_ON_ERROR

Adds the special recipe .DELETE_ON_ERROR. As per the GNU make
documentation:

.DELETE_ON_ERROR

If .DELETE_ON_ERROR is mentioned as a target anywhere in the
makefile, then make will delete the target of a rule if it has
changed and its recipe exits with a nonzero exit status, just as it
does when it receives a signal.
[...]
This is almost always what you want make to do, but it is not
historical practice; so for compatibility, you must explicitly
request it.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>