From: Benoit Daloze <eregontp@...>
Date: 2011-07-25T01:11:09+09:00
Subject: [ruby-core:38458] Re: [Ruby 1.9 - Bug #5090] Segfault using Enumerator

On 24 July 2011 16:30, Robert Syme <rob.syme@gmail.com> wrote:
> I notice that gdb reports "no debugging symbols found". Do I need to recompile ruby for this to work? Do I need to provide a particular flag to configure, and if so, what flag? Sorry for my ignorance, this is my first ruby bug report.

On 24 July 2011 16:37, Yusuke Endoh <mame@tsg.ne.jp> wrote:
> I'm not sure if rvm might tweak build option. �I'm not familiar with rvm.
> Can anyone who is familiar with rvm, answer?

http://beginrescueend.com/rubies/installing/ says to use:
   export optflags="-O0 -ggdb"; rvm install ruby-name

However I see recent rvm always use the "-g" flag, but not -O0, so you
might not see some values in gdb as they are optimized.
https://github.com/wayneeseguin/rvm/blob/master/scripts/functions/build#L13-15

So yes, you need to recompile with:
    export optflags="-O0 -ggdb"; rvm install ruby-1.9.2-p180

Sorry, I can not test myself at the moment, but that should work.