I looked at how aMule does their backtrace, they call the backtrace()
and backtrace_symbols() functions from /usr/include/execinfo.h
This is a little cleaner than trying to run gdb and pipe commands into
it, and it doesn't add any extra dependencies, but it has some
disadvantages: It can only get a backtrace for the current thread, it
doesn't get any useful information unless everything is linked with gcc
-rdynamic (which gets passed to ld as -export-dynamic), it gets screwed
up by -fomit-frame-pointer, and it only works on Linux.
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