In (info "(make) Wildcard Examples")
Wildcard expansion does not happen when you define a variable. Thus,
if you write this:
objects = *.o
then the value of the variable 'objects' is the actual string '*.o'.
However, if you use the value of 'objects' in a target or prerequisite,
wildcard expansion will take place there.
OK, but do also mention "don't expect to also have variable expansion done at
the same time", else risk:
make: *** No rule to make target
'$HOME/.spamassassin-tree/etc/mail/spamassassin/*.pre', needed by
'myconfdir/jidanni.pre'. Stop.
as seen with the commented out line in:
IT=$$HOME/.spamassassin-tree
#pre=$(IT)/etc/mail/spamassassin/*.pre
pre=/home/jidanni/.spamassassin-tree/etc/mail/spamassassin/*.pre
myconfdir/$J.pre: $(pre) myconfdir
perl ... > $@
GNU Make 4.2.1
Wait, using $(HOME) fixes it.
So warn "don't also expect shell expansion at the same time as *
expansion" I suppose.
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