I have copied one line of the make manual:
-----------------------------------------------------------------------------
"Occasionally, however, you have a situation where you want to impose
a specific ordering on the rules to be invoked without forcing the
target to be updated if one of those rules is executed. In that case,
you want to define order-only prerequisites. "
------------------------------------------------------------------------------
Now Lets take a look at the following example:
target1: | di1
@echo "inside target1"
@touch target1
di1:
@echo "inside di1"
If target1 does not exist, even the order-only prerequisite, di1, will
force target1 to be updated!
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