bug#48060: "make check" leaves temporary files after native-comp merge

[Lars Ingebrigtsen]

Andrea Corallo <akrl@sdf.org> writes:

>> Couldn't you create this different folder inside an ert-deftest, and
>> remove it at test-case end?
>
> No, Emacs needs to be able if necessary to depose .eln files even before
> a test is run (this is not specific to native-comp tests), and given we
> set HOME to a non existent directory the conventional
> "~/.emacs.d/eln-cache" can't be used.

I don't quite understand how this precludes us from specifying a
directory under test/ for the .eln files?  I.e., 

HOME=/nonexistent ELN_DIR=test/cache-dir emacs ...

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