Re: pattern rules with absolute paths and chaining (Was: implicit rules with absolute paths and chaining (Was: targets starting with '/'))

[Noel Yap]

I think the following summarizes the problem.

Given the makefile:

.PHONY: all
all: /tmp/yapn/install/GNUaoeu.mk

/tmp/yapn/install/%.mk: /tmp/yapn/build/%.mk | /tmp/yapn/install/.
        cp $(<) $(@)

/tmp/yapn/build/%.mk: /tmp/yapn/src/%.mk | /tmp/yapn/build/.
        cp $(<) $(@)

.PRECIOUS: %/.
%/.:
        mkdir -p $(@)


Chaining doesn't work:

$ gmake -npqr | grep '\.mk:'
gmake: *** No rule to make target `/tmp/yapn/install/GNUaoeu.mk', needed by 
`all'.  Stop.
/tmp/yapn/build/%.mk: /tmp/yapn/src/%.mk /tmp/yapn/build/.
/tmp/yapn/install/GNUaoeu.mk:
$ gmake
gmake: *** No rule to make target `/tmp/yapn/install/GNUaoeu.mk', needed by 
`all'.  Stop.


It looks like the install pattern rule isn't even in the database.  Can someone 
confirm this, please?

Thanks,
Noel

Noel Yap wrote:

> Sorry, the subject should've read "pattern rules", not "implicit rules".
>
> Noel
>
> Noel Yap wrote:
>
> > Interesting, it looks like this has something to do with chaining:
> >
> > .PHONY: all
> > all: /tmp/yapn/install/GNUaoeu.mk
> >
> > /tmp/yapn/install/%.mk: /tmp/yapn/src/%.mk | /tmp/yapn/install/.
> >     cp $(<) $(@)
> >
> > .PRECIOUS: %/.
> > %/.:
> >     mkdir -p $(@)
> >
> >
> > Here's the output:
> >
> > $ gmake -npqr | grep GNUaoeu.mk
> > all: /tmp/yapn/install/GNUaoeu.mk
> > /tmp/yapn/install/GNUaoeu.mk: /tmp/yapn/src/GNUaoeu.mk | 
> > /tmp/yapn/install/.
> > /tmp/yapn/src/GNUaoeu.mk:
> > $ gmake
> > mkdir -p /tmp/yapn/install/.
> > cp /tmp/yapn/src/GNUaoeu.mk /tmp/yapn/install/GNUaoeu.mk
> >
> >
> > I rechecked the docs and couldn't find anything that describes this, 
> > along with the below, behaviour.  Can someone confirm or deny that 
> > this is a bug, please?
> >
> > Thanks,
> > Noel
> >
> > Noel Yap wrote:
> >
> > > The following makefile works perfectly:
> > >
> > > .PHONY: all
> > > all: ../install/GNUaoeu.mk
> > >
> > > ../install/%.mk: ../build/%.mk | ../install/.
> > >     cp $(<) $(@)
> > >
> > > ../build/%.mk: ../src/%.mk | ../build/.
> > >     cp $(<) $(@)
> > >
> > > .PRECIOUS: %/.
> > > %/.:
> > >     mkdir -p $(@)
> > >
> > >
> > > It's output is:
> > >
> > > $ gmake -npqr | grep GNUaoeu.mk
> > > all: ../install/GNUaoeu.mk
> > > ../install/GNUaoeu.mk: ../build/GNUaoeu.mk | ../install/.
> > > ../build/GNUaoeu.mk: ../src/GNUaoeu.mk | ../build/.
> > > ../src/GNUaoeu.mk:
> > > $ gmake
> > > mkdir -p ../build/.
> > > cp ../src/GNUaoeu.mk ../build/GNUaoeu.mk
> > > mkdir -p ../install/.
> > > cp ../build/GNUaoeu.mk ../install/GNUaoeu.mk
> > > rm ../build/GNUaoeu.mk
> > >
> > >
> > > But if I start using absolute paths, things stop working:
> > >
> > > .PHONY: all
> > > all: /tmp/yapn/install/GNUaoeu.mk
> > >
> > > /tmp/yapn/install/%.mk: /tmp/yapn/build/%.mk | /tmp/yapn/install/.
> > >     cp $(<) $(@)
> > >
> > > /tmp/yapn/build/%.mk: /tmp/yapn/src/%.mk | /tmp/yapn/build/.
> > >     cp $(<) $(@)
> > >
> > > .PRECIOUS: %/.
> > > %/.:
> > >     mkdir -p $(@)
> > >
> > >
> > > $ gmake -npqr | grep GNUaoeu.mk
> > > gmake: *** No rule to make target `/tmp/yapn/install/GNUaoeu.mk', 
> > > needed by `all'.  Stop.
> > > all: /tmp/yapn/install/GNUaoeu.mk
> > > /tmp/yapn/install/GNUaoeu.mk:
> > > $ gmake
> > > gmake: *** No rule to make target `/tmp/yapn/install/GNUaoeu.mk', 
> > > needed by `all'.  Stop.
> > >
> > >
> > > IIRC, there's special treatment for targets that start with '/'.  Can 
> > > someone point me to where in the docs it talks about this, please?
> > >
> > > Thanks,
> > > Noel
> > >
> > >
> > > _______________________________________________
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