On Fri, Jun 27, 2014 at 11:24 AM, Tom Varga <tomva...@gmail.com> wrote: > > On page 120 of the gnumake manual, it mentions support for pattern > rules with multiple targets. > > This pattern rule has two targets: > %.tab.c %.tab.h: %.y > bison -d $< > > So, if I have a simple rule that looks like: > > %.bar1 %.bar2 : %.foo > touch $(*F).bar1 > touch $(*F).bar2 > > and then do: > > > touch a.foo > > make a.bar1 > touch a.bar1 > touch a.bar2 > > make a.bar1 > make: 'a.bar1' is up to date. > > rm a.bar2 > > make a.bar1 > make: 'a.bar1' is up to date. > > make a.bar2 > touch a.bar1 > touch a.bar2 > > What I was really hoping is that make would consider both a.bar1 and > a.bar2 to be required outputs of the rule and if one of them is > deleted, then both the .bar1 and .bar2 targets should be considered > out-of-date. But when I manually remove the a.bar2 file, the a.bar1 > file is still considered to be up-to-date. Yet, when I then ask to > build the a.bar2 target, both the a.bar1 and a.bar2 targets are > re-built. >
Umm, why isn't this solved by having a correct dependency on a.bar2 where necessary? Philip Guenther
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