Re: order-only dependency and transitivity

[Noel Yap]

IIUC, the following is what's needed (other changes may be necessary to support 
parallel builds correctly):

x.cc m.touch: m.web
        @echo tangling web
        touch m.touch
        @echo x.cc rule
        touch x.cc

x.o: x.cc
        @echo compiling x
        touch x.o


I have a feeling the original didn't work as expected because the action that 
touched x.cc wasn't part of the x.cc rule.

Noel

Ross Boylan wrote:

> On Wed, Jun 09, 2004 at 04:14:45PM -0400, Noel Yap wrote:
>
> > Can you copy and paste your command lines and output, please?
> >
> > Thanks,
> > Noel
>
> address@hidden:~/UCSF/peter/R/mspath/src/maketest$ touch x.cc
> address@hidden:~/UCSF/peter/R/mspath/src/maketest$ touch x.o
> address@hidden:~/UCSF/peter/R/mspath/src/maketest$ touch m.web
> address@hidden:~/UCSF/peter/R/mspath/src/maketest$ make x.o
> tangling web
> touch x.cc
> touch m.touch
> address@hidden:~/UCSF/peter/R/mspath/src/maketest$ make x.o
> compiling x
> touch x.o
> address@hidden:~/UCSF/peter/R/mspath/src/maketest$ cat Makefile
> m.touch: m.web
>         @echo tangling web
>         touch x.cc
>         touch m.touch
>
> x.cc: | m.touch
>         @echo x.cc rule
>
> x.o: x.cc
>         @echo compiling x
>         touch x.o
>
> # I changed the order of commands in m.touch (relative to my original
> # post)for greater realism, but it made no difference.