On Wed, 25 Feb 2009, Xin LI wrote:
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Hi,
Just wanted to confirm that the following procedure to change an
existing interface:
- Remove the symbol in question from all previous FBSD_1.* namespaces
with their corresponding Symbol.map files;
- Add the new symbol into latest FBSD_1.* namespace, say, FBSD_1.1 for
now, into corresponding Symbol.map files;
- Create a new file containing the compatibility shims with prefix __
and suffix of something indicating its obsoleteness, e.g. _44bsd. For
instance, for function foo(), the shim function would be called
__foo_44bsd();
- At the tail of the shim file, add glues for the old symbols like this:
__sym_compat(foo, __foo_44bsd, FBSD_1.0);
- Double check to make sure that new .so would work with old binaries.
Is that correct?
Yes, I believe that is correct. I also think that
the awk script that processes the Symbol.map files
will also warn you if the symbol is multiply declared.
--
DE
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