Re: [jamboost] rename library when stage-ing

From: Vladimir Prus (ghost_at_[hidden])
Date: 2005-02-09 03:42:56

Hi Toon,
> We build the same library using different dependencies. For instance one
> library is either linked with the open-source MPI implementation MPI or
> linked with a commercial implemantion like POE (MPI of IBM).
>
> So our Jamfile looks like:
>
> lib some_lib_mpich : foo.cpp /user-config//libmpich ;
> lib some_lib_poe : foo.cpp /user-config//libpoe ;
>
> Now when intalling, we 'stage' these targets into a directory that
> contains all libraries linked with mpich and into a directory that
> contains all libraries linked with poe. However we would like that the
> library in those directories have the same name. Thus we would like to
> do soth like:
>
> stage mpich : some_lib_mpich : <rename>some_lib ;
> stage poe : some_lib_poe : <rename>some_lib ;

It was possible in the past using almost the same syntax (<name> instead of 
<rename>). However, I've recently removed this functionality because it might 
not work reliably.

Consider:

lib a : a.cpp ;
lib b : b.cpp a ;

stage a_dist : a : <name>my_a <location>dist ;
stage a_dist : b : <name>my_b <location>dist ;

On Linux, you need to relink the library when changing the name. When 
relinking 'b' you probably need to link it against *staged* a -- because the 
name of 'a' is changed during staging too. Without this, 'b' will still refer 
to library called 'a', even though 'my_b' is installed. 
Implementing the right behaviour is somewhat hard. What if I build only 'b', 
for example. I need to link my_b against my_a, but my_a is not staged....

I would suggest using either new feature or <location-prefix> to build the two 
libraries into different directories, but with the same name.

- Volodya