You fellows have a lot of explaining to do. (On the Info page, not to me.)
In (info "(make) Special Targets")
`.PRECIOUS'
...Also, if the target is an intermediate file, it will not be
deleted after it is no longer needed, as is normally done... In
this latter respect it overlaps with the `.SECONDARY' special
target.
However we see that only genuine .PRECIOUS will preserve the
intermediate file. .SECONDARY, on the other hand, will blow - it - away.
$ ls
Makefile u.kml
$ cat Makefile
.SECONDARY:%.kmz
%.kmz:%.kml;touch $@
%.val:%.kmz;
$ make u.val
touch u.kmz
rm u.kmz
$ emacs Makefile
$ cat Makefile
.PRECIOUS:%.kmz
%.kmz:%.kml;touch $@
%.val:%.kmz;
$ make u.val
touch u.kmz
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