Hi all,
I have a problem with the behavior of implicit rules if one
or more
prerequisites are not exists.
The following works (explicit rule for test.out):
--
all: test.out
test.out: test.in
 cat
test.in >> test.out
%.in:
echo "Missing file $!"
exit 1
.PHONY: all
--
If test.in not exists the implicit target %.in will trigger
and shows the
message. This even happens if test.out already exists!
The following does not work:
--
all: test.out
# Implicit rule for test.out
%.out: test.in
cat test.in >> test.out
%.in:
echo "Missing file $!"
exit 1
.PHONY: all
--
Here %.in will only trigger if test.out does not exists. If
I remove test.in
(while test.out exists) the %.in target will never
trigger...
Now my question:
Is this a bug or well defined behavior.
I need a mechanism to find out missing prerequisites like
above.
Many thanks and Best Regards,
Peer Georgi.
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