Re: [Discuss-gnuradio] GNU Radio shared library versioning

[Sylvain Munaut]

Hi,

> [libboost_date_time-mt.so.1.48.0]

Not necessarely so, see on my system :

lrwxrwxrwx 1 root root    36 Dec 16  2012
/usr/lib/libboost_date_time-mt-1_49.so ->
libboost_date_time-mt-1_49.so.1.49.0
-rwxr-xr-x 1 root root 72168 Dec 16  2012
/usr/lib/libboost_date_time-mt-1_49.so.1.49.0
lrwxrwxrwx 1 root root    29 Dec 16  2012
/usr/lib/libboost_date_time-mt.so -> libboost_date_time-mt-1_49.so

> Comparing the strings extracted from the .so with readelf, we can see
> the gnuradio libraries are not properly versioned (I show the boost one
> for comparison).
>
> I expect to see:
>
> libgnuradio-filter.so.3.7.0

You should read
http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html

The 3 numbers there are the 3 numbers after the .so.xxx

Imagine you have libXXX.so.1.2.3   and the libXXX.so  & libXXX.so.1
symbolic link which is the common style.

In general the libXXX.so should point to whatever you want to link to
when compiling a new software and using -lXXX
The binary will then contain the info that it will try to load
libXXX.so.1  and that implies that all libXX.so.1.N.N have the same
ABI.
The .2.3 part should only be used for internal revisions that don't
change any thing externally so that a software compiled against an
older lib will be able to load the new one without any issue.

This would clearly not be the case for libgnuradio.3 ...

Cheers,

    Sylvain