depends_lib, depends_build, depends_run, oh my

[Randall Wood]

A dependency is considered satisfied if the dependency is installed,  
not if it is activated. I think this should be considered a bug.

You encountered a problem unrelated to the separation of dependencies  
into runtime (_run), linked against (_lib), and build time (_build)  
dependencies.

On 5 Aug 2007, at 04:41, Ryan Schmidt wrote:

> Have various dependency questions here. I couldn't find info on  
> this in the new guide.
>
> Why do we have depends_lib, depends_build and depends_run? Why not  
> just a single "depends"? Why does it matter which phase requires  
> the other software? Isn't it enough to know that the other software  
> is required at some point, and so MacPorts should install that  
> other software first?
>
> What are these three keywords supposed to denote? I thought  
> "depends_lib" was for libraries a program links with (e.g.  
> gettext), "depends_build" was for things only the build system  
> needs (e.g. pkgconfig) and "depends_run" was for binaries that need  
> to be present at runtime (e.g. I have no idea).
>
> To this end, I tried adding "depends_build pkgconfig" to a port  
> that needs it (graphviz), and then I forcibly deactivated the  
> installed pkgconfig to make sure that worked. Well, it didn't.  
> "sudo port install graphviz" proceeded to build just graphviz,  
> without attempting to activate the required pkgconfig first. If, on  
> the other hand, I completely uninstalled pkgconfig first, it then  
> correctly installed pkgconfig when I tried to install graphviz. Why  
> does a deactivated port seem to satisfy the dependency? That should  
> not be.
>
> Hm... could it be that the point is that it should be fine to  
> uninstall a build dependency later, but uninstalling a library or  
> runtime dependency would cause installed ports to fail? Is that the  
> reasoning?
>
> MacPorts trunk (past 1.5.0), Xcode 2.4.1, Intel Core 2 Duo
>
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Randall Wood
rhwood at mac.com
http://shyramblings.blogspot.com

"The rules are simple: The ball is round. The game lasts 90 minutes.  
All the
rest is just philosophy."