Re: conditional prerequisite

[Tristan Van Berkom]

Martin d'Anjou wrote:

> Hi,
>
> I have a static pattern rule like this:
>
> %.o: %.c
>         gcc ...
>
> Occasionaly, I have an additional dependency, but not always, so I added:
>
> %.other: %.weird
>         compile weird
>
> %.o: %.c %.other
>         gcc ...
>
> But the entire thing fails now as no rule can be found when there is no 
> corresponding ".other" file.
>  

You might want to start by :

%.o:: %.c
        gcc...

%.o:: %.c %.other
        gcc...

to make sure that `make' knows you have more than one way to
update a `.o' file.

Just a hint,

HTH,
                               -Tristan