[bug #54854] multi-target rules invoked too often with -j2

[Paul D. Smith]

Follow-up Comment #5, bug #54854 (group make):

Definitely there are a lot of valid uses.  Generally, any time where you want
to define the same recipe for lots of different targets but you don't want to
have to write them all out one at a time.

Your assertion that this construct is not common is just not true: this
appears all over the place in all sorts of makefiles.  In fact I just checked
a makefile generated by GNU's automake tool, and it uses the construct. 
Here's one simple example of an obvious way this might be used:

SUBDIRS := $(wildcard */.)

all: $(SUBDIRS)

$(SUBDIRS):
        $(MAKE) -C $@

.PHONY: all $(SUBDIRS)


There's no reason this should give any sort of warning, even when used with
-j.


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