[Poll] On Linux, what should we commonly use as sub-directory name for D?

[Johannes Pfau]

Am Fri, 15 Nov 2013 01:01:34 +0100
schrieb Marco Leise <Marco.Leise at gmx.de>:

> Am Fri, 15 Nov 2013 00:03:42 +0100
> schrieb Marco Leise <Marco.Leise at gmx.de>:
> 
> > Am Thu, 14 Nov 2013 21:35:22 +0100
> > schrieb Johannes Pfau <nospam at example.com>:
> > 
> > > AFAIK you can't put shared libraries into a different folder.
> > > The runtime linker must be able to find the libraries so the
> > > folders have to be registered in ld.so.conf. But ld 'virtually
> > > merges' all directories so you still can't have libraries with
> > > the same name & version in different folders. There are some
> > > tricks (rpath, LD_LIBRARY_PATH) but this won't work well in a
> > > large scale scenario.
> > 
> > That explains why Haskell's Cabal is installing libraries with
> > compiler AND library version in the file name :-/
> 
> That doesn't read too bad:
> http://en.wikipedia.org/wiki/Rpath#GNU_ld.so
> So -rpath basically just hints at the library location.
> CMake has more or less direct support for it:
> SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
> 
> The other option would be to install a symlink foo.so into the
> compiler specific lib directory that links
> to /usr/lib/foo-dmd.so.X.Y that has an soname of "foo.so.X".
> But I feel that would confuse the pants off of people.
> 

The linux distributions will have to agree with this path schemes
though. It's probably more a political problem, but still.

For example in debian using rpath is discouraged
https://wiki.debian.org/RpathIssue

There's also another bad consequence of missing binary compatibility: If
you have app A compiled with LDC and app B compiled with GDC and both
app A and B depend on vibeD, mustached, dyaml then you'll have too keep
copies of all those libraries for gdc and ldc. I guess most linux
distributions will just choose one compiler and then compile everything
with this compiler. (Probably not DMD because of OSS reasons)

But I don't have a good or quick solution for this issue so I certainly
won't complain about any working solution ;-)