A working backtrace for linux

[Sean Kelly]

Graham St Jack Wrote:
>
> Sean, is there any chance of you rolling some of the good stuff in this 
> code into druntime?
> 
> In particular, it would be very nice to get symbol names in a stacktrace 
> rather than a bunch of addresses, and even nicer to get a stacktrace on 
> a SIGSEGV.

You can get the symbol names by adding -L--export-dynamic to your DFLAGS in dmd.conf.  That option is on by default on OSX and I didn't realize it was different on Linux.  I'll sort out demangling as well, it's just a bit more work.  I like the stack trace code provided, but it uses a lot of modules that aren't available to druntime so it would be difficult to use directly.