Improving debugging support for Asterisk

[Paul Belanger]

Evening,

Currently, we don't have a good method to generate unoptimized 
backtraces if Asterisk crashes; this make it hard for upstream developer 
to get the required information.  With this patch, we now toggle 
--enable-dev-mode, DONT_OPTIMIZE and DEBUG_THREADS, the usually flags 
required to generate a backtrace[1].

This does not affect packages in the repository (because of the overhead 
added to Asterisk), but allows local users to rebuild the package if 
required.

$ sudo apt-get build-dep asterisk
$ DEB_BUILD_OPTIONS="debug" apt-get -b source asterisk

Once built, the local user can install, reproduce their issue, and 
generate a good backtrace.

[1] https://wiki.asterisk.org/wiki/display/AST/Getting+a+Backtrace

-- 
Paul Belanger
Digium, Inc. | Software Developer
twitter: pabelanger | IRC: pabelanger (Freenode)
Check us out at: http://digium.com & http://asterisk.org
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