[Vm-dev] Thanks, I was able to build Cog

Mariano Martinez Peck marianopeck at gmail.com
Tue Jul 5 11:56:52 UTC 2011


Thanks David. Yes, I agree as well:

Name: CMakeVMMaker-MarianoMartinezPeck.114
Author: MarianoMartinezPeck
Time: 5 July 2011, 1:56:28 pm
UUID: e473f414-b9ec-4b86-895f-6a8fd289f45b
Ancestors: CMakeVMMaker-EstebanLorenzano.113

Remove "-mno-fused-madd" from FloatMathPlugin

On Tue, Jul 5, 2011 at 1:44 PM, David T. Lewis <lewis at mail.msen.com> wrote:

>
> On Mon, Jul 04, 2011 at 11:39:14PM -0400, Dimitry Golubovsky wrote:
> >
> > Hi,
> >
> > Thanks Igor and Mariano. I synced my clone repo with blessed, and was
> > able to build Cog via cmake (looks like I did not read one paragraph
> > in Mariano's guide ;)
> >
> > I ran into the cc1: error: unrecognized command line option
> > "-mno-fused-madd" error while compiling the float math plugin.
> >
> > I use
> >
> > dima at slax:~/src/cogvm/dmg-blessed/build$ gcc --version
> > gcc (GCC) 4.2.4
> > Copyright (C) 2007 Free Software Foundation, Inc.
> >
> > not very new but did not really have plans to upgrade it. I followed
> > this discussion:
> >
> >
> http://forum.world.st/Failed-to-build-FloatMathPlugin-on-FreeBSD-td3346374.html
> >
> > commenting out the relevant line in FloatMathPlugin/CMakeLists.txt
> >
> > I see where it is coming from (class CPlatformConfig in CMakeVMMaker):
> >
> > configureFloatMathPlugin: maker
> >       "extra rules for FloatMathPlugin"
> > ....
> >
> >       "according to http://www.netlib.org/fdlibm/readme
> >       it should be compiled with no optimizations"
> >       maker addDefinitions: '-O0 -mno-fused-madd'.
> >
>
> I would suggest removing the -mno-fused-madd option from the cmake
> configuration. Ian made this change for the cmake build in trunk,
> see platforms/unix/plugins/FloatMathPlugin/config.cmake for reference.
>
> Some background is at http://bugs.squeak.org/view.php?id=7592 and
> also some discussion on vm-dev, but to summarize the conclusion as
> I understand it:
>
>  There is no evidence that the -mno-fused-madd option has any
>  effect on the plugin that can be detected by the unit tests.
>  This is a non-portable compiler option that is not necessary
>  for correct functioning of the plugin, and therefore should
>  not be used.
>
> Dave
>
>


-- 
Mariano
http://marianopeck.wordpress.com
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