DELETE_ON_ERROR test-suite.log and .PRECIOUS

[Holger Hans Peter Freyther]

Good Morning,

systemd is using .DELETE_ON_ERROR to simplify some rules[1] but the
side-effect is that during make check and a failing test the result
of 'test-suite.log' will be deleted as well. I 'fixed' this by adding
.PRECIOUS: $(TEST_SUITE_LOG) to the file but that is triggering the
following warning:

Makefile.am:35: warning: user target '.PRECIOUS' defined here ...
/usr/share/automake-1.13/am/configure.am: ... overrides Automake target
'.PRECIOUS' defined here

Is there a better way to ask automake/make to keep the test-suite.log
around? Is there a way to make the warning go away?

kind regards
        holger


[1] 
http://cgit.freedesktop.org/systemd/systemd/commit/?id=96bd03d5b8d5d04fc8037c03a43bb5b148cc1e29