[maemo-developers] [maemo-developers] packages: soname (0c2a, etc)

[From: Adrian Neumaier]

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Murray Cumming schrieb:
> The soname is the package suffix, such as 0c2a seen here:
> http://packages.debian.org/unstable/libs/libsigc++-2.0-0c2a
> 
> I believe that these suffixes are changed whenever either
> - A new version of g++, with a new C++ ABI, is used.
> or
> - A new version of libstdc++, with a new ABI, is used.

Thats correct.

> I don't know what the 0, c, 2, or a parts of the suffix mean, or if suffix
> is just changed arbitrarily. I can't find an overview of these in the
> debian documentation.

- -0 is the package revision. So in the end this whole thing means:
libsigc++ Version 2.0, Package revision 0, build with gcc-4.x
c2a was introduced during the transition of gcc-3.3 to gcc-4.0 in
unstable. gcc3.3 and 4.x have incompatible abi's, so if your lib is
compiled with the 4.x suite, you cannot link use it with a program
compiled with 3.3 or earlier.

You could search on the debian-devel mailinglist for a detailed
description. I cannot remember the exact meaning for c2a either :-)

> Maybe we could use the appropriate debian sonames, but we probably don't
> have the same combinations of C++ and libstdc++ ABIs so there might be no
> appropriate choice.
> 
> 
> I could remove the soname/suffix from the package name, which would
> involve a few more changes to the debian/ stuff than I'd like to make, so
> I thought I'd check first.

Bad idea :-) Those sonames are in debian to indicate that the abi has
changed, and thus the packages depending on that lib needs to be recompiled.

Cheers
Adrian
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