[asterisk-dev] [Code Review] Remove embedding of res_adsi.so and switch ADSI API from using optional API to using stubs if res_adsi.so is not loaded.

[Mark Michelson]

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Review request for Asterisk Developers and Leif Madsen.


Summary
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When using gcc version 4.5+, weak reference support appears to be disabled. The Makefile logic thus embeds res_adsi.so into the binary. Even with no modules.conf file or with a modules.conf file that specifies "noload => res_adsi" the module is still loaded. If res_adsi.so is not even compiled, then a module called "core" gets loaded on startup instead.

The fix I propose here is to remove the embedding of res_adsi.so from the Makefile. To fix linking errors that occur in features.c, I also have switched the ADSI API from using the optional API to defining stub functions if res_adsi.so is not loaded. When res_adsi.so is loaded, it provides a function table for the core to farm the work out to.


This addresses bug ASTERISK-19920.
    https://issues.asterisk.org/jira/browse/ASTERISK-19920


Diffs
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  /branches/1.8/include/asterisk/adsi.h 368806 
  /branches/1.8/main/Makefile 368927 
  /branches/1.8/main/adsi.c PRE-CREATION 
  /branches/1.8/res/res_adsi.c 368806 
  /branches/1.8/res/res_adsi.exports.in 368806 

Diff: https://reviewboard.asterisk.org/r/1991/diff


Testing
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Compiled using GCC 4.4, 4.5, and 4.6. In all cases, the code compiled cleanly and res_adsi.so was only loaded if it was supposed to be.


Thanks,

Mark

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