Update of bug #52028 (project make):
Open/Closed: Open => Closed
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Follow-up Comment #1:
I don't think adding a new function is appropriate for this. It's simpler,
IMO, to use the existing "-o" / "--old-file" command line option and arrange
for it to be passed down. For example something like:
$ cat Makefile
export OLDFILES
a :
echo a1
$(eval OLD_FILES += -o$@)
$(MAKE) $(OLD_FILES) b
echo a2
b :
echo b1
$(eval OLD_FILES += -o$@)
$(MAKE) $(OLD_FILES) a
echo b2
$ make
echo a1
a1
make -oa b
echo b1
b1
make -oa -ob a
make[2]: 'a' is up to date.
echo b2
b2
echo a2
a2
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