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Re: Making it easy to use -flto for bootstrap

From: Alexandre Oliva <aoliva at redhat dot com>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Sun, 20 Jun 2010 21:21:03 -0300
Subject: Re: Making it easy to use -flto for bootstrap
References: <orzkytii3a.fsf@livre.localdomain> <AANLkTinRMhWuhYmh6WGKSdSQ9_TZRh0D3KSROqgKzYvM@mail.gmail.com>

On Jun 18, 2010, Richard Guenther <richard.guenther@gmail.com> wrote:

> The build-config should use WHOPR, not LTO.

I'm not sure I fully understand the difference, even after looking at
the docs.  Clearly using -flto had some effect, and we have tests for
both -flto and -fwhopr, so I went ahead and installed this patch.  I
suppose it would make sense to introduce bootstrap-whopr as well.

> So -fwhopr=N and -fno-whopr (but where and how to get N from?).

Perhaps some --with-whopr configure option could optionally set a
Makefile variable, which a bootstrap-whopr configuration could use.  The
Makefile variable could always be overridden in the command line, of
course.

-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer

Follow-Ups:
- Re: Making it easy to use -flto for bootstrap
  - From: Jan Hubicka

References:
- Making it easy to use -flto for bootstrap
  - From: Alexandre Oliva
- Re: Making it easy to use -flto for bootstrap
  - From: Richard Guenther

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