Compatibility .so linker scripts for merged libraries

[Florian Weimer]

* Yann Droneaud:

> Was it considered dangerous to introduce "compatibility" .so link
> scripts for the libraries that was merged into libc.so (libpthread, 
> librt, libdl, etc.) ?
>
>
>
> For example:
> $ cat librt.so
> /* GNU ld script
>    Use the static library */
> OUTPUT_FORMAT(elf64-x86-64)
> GROUP ( /lib/x86_64-linux-gnu/librt.a )
>
>
> Because I'm having some bad times fixing issues in a build system that
> try to locate now missing .so with gcc -print-file-name= then uses the 
> paths to the libraries instead of -l name them.

Which build system is that?  This seems to be rather uncommon.  Adding
non-loadable .so files tends to break other things.

We have seen some breakage as well due to the merging, but they have
been clear bugs in the build systems.  Like testing whether linking
against -lpthread is needed to make pthread_create available, and then
using that flag (the need for -lpthread) as an indicator whether
threading is available and pthread_create should be used.  But the
-print-file-name= stuff is new to me.

Thanks,
Florian