Libtool archives (*.la) policy

From Mandriva Community Wiki

Contents 1 When are *.la needed 1.1 libltdl 1.2 static build 1.3 shared build 2 How to package *.la

When are *.la needed

libltdl

libltdl is a wrapper around dlopen and allows to dynamically load shared libraries. This is mostly used for plugins.

More investigation is needed

static build

When you use a *.a file, you need the corresponding *.la to know the dependency of the library (since *.a do not bundle this information).

shared build

libtool uses *.la to know the dependencies. But libtool works correctly without *.la files. Worse, default libtool causes overlinking when it uses *.la. That's why many linux distributions get rid of *.la files unless strictly needed (for "libltdl" or "static build")

How to package *.la

.la should be in libxxx-static-devel, unless needed through dlopen in which case they should go to libxxx directly (nb: it raises issues with conflicts with other libxxx with different major). There's no reason afaik to have *.la in libxxx-devel.

Migrating warning from existing 2008.1 policy: if *.la are moved (to -static-devel), it may hide the libtool bug and will pop from time to time when -static-devel are installed.