Hi Brett,

On Fri, Mar 19, 2010 at 04:27:16PM -0400, Brett Viren wrote:
> Peter Elmer <[log in to unmask]> writes:
> 
> > There were also other oddities about the "gcc43 preview" build, e.g. 
> > difficulties building boost, that caused the LHC experiments to reject it 
> > in favor of our own build(s) of the stock gcc43x. (Subsequent to that decision 
> > the "preview" switched to gcc4.4...)
> 
> Funny you should say this!  I'm trying to get gcc43 installed just so I
> can match what is on the nodes on our RACF farm which are heavily
> influenced by ATLAS's needs.  However, I see that the stock
> gcc43-4.3.2-7.el5 packages installed.  FWIW, we also rely on Boost and
> I've built it (v1.38) with gcc43 and didn't see any problems.  

  IIRC, it failed to build of the subsequent versions (1.39, IIRC) and
digging through my mail I see that came from something in the libstdc++
compatibility changes they made in the RH "preview" gcc43. The 
"gcc43-4.3.2-7.el5" packages you see installed are probably the "preview" 
build, I believe, and not "stock" gcc43x (by which I mean what you get if you 
download the gcc43{1,2,3,4} source tarball yourself and build it, unhacked to 
back up libstdc++). 

  I'm pretty certain that Atlas isn't using the OS-install of the "preview"
build, but rather a build of the compiler in their own software area, but
you should check with someone from Atlas in case I am missing something. 
They were part of the discussions that chose to use the stock GNU gcc43 over 
the RHEL5 "preview" gcc43. (I'm 100% certain that CMS isn't using it, but 
that doesn't help you... ;-)

                                   Pete

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Peter Elmer     E-mail: [log in to unmask]      Phone: +41 (22) 767-4644
Address: CERN Division PPE, Bat. 32 2C-14, CH-1211 Geneva 23, Switzerland
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