Greetings -
Please could anyone explain the behaviour of this test makefile (attached) :
<quote><code>
TMP:=/tmp
%.ext:
touch $@
.PHONY: *.oop
%.oop:
@echo 'A phony order-only prequisite of /tmp/a.t';
#$(TMP)/%.t: | %.oop
$(TMP)/%.t:$(TMP)/%.ext | %.oop
@echo Specific Rule
%.t:%.ext
@echo General rule
</code></quote>
when invoked with :
$ make -f ${the_makefile} /tmp/a.t
I would expect that the most specific matching first rule
would be invoked always, with its extra order-only
pre-requisite recipe always being invoked, but actually
this occurs only if /tmp/a.ext does not already exist -
I tested latest make-4.1, and make-3.82, on a RHEL6 linux
platform, and both show the same behaviour:
$ make -f ${the_makefile} /tmp/a.t
touch /tmp/a.ext
A phony order-only prequisite of /tmp/a.t
Specific Rule
rm /tmp/a.ext
but if I :
$ touch /tmp/a.ext
and then :
$ make -f ${the_makefile} /tmp/a.t
Gemeral Rule
If I remove the phony order only dependency. so that the /tmp/%.t rule reads:
<quote><code>
$(TMP)/%.t:$(TMP)/%.ext
</code></quote>
then the makefile always runs the first recipe, regardless of the existence
of /tmp/a.ext :
$ make -f ${the_makefile} /tmp/a.t
Specific Rule
$ touch /tmp/a.ext
$ make -f ${the_makefile} /tmp/a.t
Specific Rule
$ rm /tmp/a.ext
$ make -f ${the_makefile} /tmp/a.t
touch /tmp/a.ext
Specific Rule
rm /tmp/a.ext
Also, a second problem is that order-only dependencies are not
recognized when specified by multiple rules without recipes are
specified for same target , ie:
<quote><code>
$(TMP)/%.t: | %.oop
$(TMP)/%.t:$(TMP)/%.ext
</quote></code>
has the same effect (recipe for implicit order-only pre-requisite never runs)
as no order-only dependency being specified at all. I thought the
dependencies should be merged and the %.oop recipe should be run in
this case, especially as I've told make that all *.oop targets are
phony.
Is this a bug with make ?
Any responses much appreciated.
Thank You & Regards,
Jason Vas Dias
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