[visit-developers] BoxLib fortran compiler

tom fogal tfogal at sci.utah.edu
Mon Oct 6 19:01:30 EDT 2008

Oops.  Forgot to CC the list ..

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Reply-To: tfogal at sci.utah.edu
From: tom fogal <tfogal at alumni.unh.edu>
To: Mark Miller <miller86 at llnl.gov>
Subject: Re: [visit-developers] BoxLib fortran compiler
In-Reply-To: Your message of "Mon, 06 Oct 2008 14:46:30 PDT."
             <1223329591.12925.31.camel at skywalker.llnl.gov>
References: <auto-000017644918 at sci.utah.edu> <1223329591.12925.31.camel at skywalker.llnl.gov>
Date: Mon, 06 Oct 2008 16:17:33 -0600

Mark Miller <miller86 at llnl.gov> writes:
> Any way to make the code that invokes 'gfortran' in build_visit
> conditional on the version of the compiler or, alternatively, if g77
> does not exist and gfortran does, use the latter?

Okay.  I'll see if I can split the fPIC into a separate patch, and
only apply the g77->gfortran part if ! test -x g77.

> I think -fPIC is needed when building any .o's that are later going to
> be archived into a .a file and then used to build shared objects. I am
> surprised you are just hitthing this now. First time using boxlib?

Basically.  I think I've tried to enable it every time I've built VisIt
since .. well, a long while ago.  I always spend 10 minutes before I
decide I don't use BoxLib so I don't need it anyway ... it finally
grated on me enough that I decided it needed fixing.

Plus I think I've got some BoxLib data I'll want to load up in the
next month or two ...


> On Mon, 2008-10-06 at 15:44 -0600, tom fogal wrote:
> > Hi all,
> > 
> > On a few machines now, I've had issues getting build_visit to get
> > through building BoxLib.  Turns out the issue is that most modern
> > Linux distributions have moved to gcc4, which uses the `gfortran'
> > fortran compiler instead of the `g77' compiler.
> > 
> > An unrelated issue is that I need `-fPIC' in my cxxflags for my
> > current main workstation.
> > 
> > Attached is a patch which changes both of these.  I ask whether this
> > is okay pre-commit because it will *break* build_visit for BoxLib
> > users which have g77 but not gfortran.
> > 
> > Any other review is welcome too, of course.
> > 
> > Thanks,
> > 
> > -tom
> > 
> -- 
> Mark C. Miller, Lawrence Livermore National Laboratory
> email: mailto:miller86 at llnl.gov
> (M/T/W) (925)-423-5901 (!!LLNL BUSINESS ONLY!!)
> (Th/F)  (530)-753-8511 (!!LLNL BUSINESS ONLY!!)

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