(info "(make) Errors") says
Usually when a command fails, if it has changed the target file at
all, the file is corrupted and cannot be used--or at least it is not
completely updated. Yet the file's time stamp says that it is now up to
date, so the next time `make' runs, it will not try to update that
file. The situation is just the same as when the command is killed by a
signal; *note Interrupts::. So generally the right thing to do is to
delete the target file if the command fails after beginning to change
the file. `make' will do this if `.DELETE_ON_ERROR' appears as a
target. This is almost always what you want `make' to do, but it is
not historical practice; so for compatibility, you must explicitly
request it.
I find I don't have to explicitly request it.
Or maybe it is only talking about interrupts.
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