Weston versioning (Re: [PATCH weston 6/6] libweston: do not use weston version in libweston.pc)

[Jan Engelhardt]

On Sunday 2016-07-10 13:13, Quentin Glidic wrote:
>
> If we install only one .pc file:
> - You cannot develop against an old version.

I do not feel that is true. If you have Berkeley DB 4.5 in tarball
form, you can build and `make install` it. Provided the SONAME is
different (it is; libdb-4.5.so), it *ought* not to break the rest of
your system which relies on libdb-4.8.so.

If you have db 4.5 in distropackage form, you can install the
libdb-4_5.rpm library, and it won't kick out libdb-4_8, and you can
install libdb-4_5-devel.rpm, which only kicks out libdb-4_8-devel,
but that is a negligible fact, as distro build results show that
no one seriously needs 4.5 and 4.8 at the same time a particular
software component is built.

The example extends to packages other than bdb. (bdb has no .pc
file, which is the same complexity class a one .pc file.)