[dpdk-dev] [PATCH 0/4] Add DSO symbol versioning to support backwards compatibility

[Neil Horman <nhorman@tuxdriver.com>]

The DPDK ABI develops and changes quickly, which makes it difficult for
applications to keep up with the latest version of the library, especially when
it (the DPDK) is built as a set of shared objects, as applications may be built
against an older version of the library.

To mitigate this, this patch series introduces support for library and symbol
versioning when the DPDK is built as a DSO.  Specifically, it does 4 things:

1) Adds initial support for library versioning.  Each library now has a version
map that explicitly calls out what symbols are exported to using applications,
and assigns version(s) to them

2) Adds support macros so that when libraries create incompatible ABI's,
multiple versions may be supported so that applications linked against older
DPDK releases can continue to function

3) Adds library soname versioning suffixes so that when ABI's must be broken in
a fashion that requires a rebuild of older applications, they will break at load
time, rather than cause unexpected issues at run time.

4) Adds documentation for ABI policy, and provides space to document deprecated
ABI versions, so that applications might be warned of impending changes.

With these elements in place the DPDK has some support to allow for the extended
maintenence of older API's while still allowing the freedom to develop new and
improved API's.

Implementing this feature will require some additional effort on the part of
developers and reviewers.  When reviewing patches, must be checked against
existing exports to ensure that the function prototypes are not changing.  If
they are, the versioning macros must be used, and the library export map should
be updated to reflect the new version of the function.

When data structures change, if those structures are application accessible,
apis that accept or return instances of those data structures should have new
versions created so that users of the old data structure version might co-exist
at the same time.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Thomas Monjalon <thomas.monjalon@6wind.com>
CC: "Richardson, Bruce" <bruce.richardson@intel.com>