Public SourceMage Discussion List

[Juuso Alasuutari <iuso AT sourcemage.org>]

On Monday 08 January 2007 05:13, Thomas Orgis wrote:
> SMGL Archspecs: Final Notice
<snip>
> b) the last questions about them that bother me:
>       1. Do we need to introduce extra minimal archspecs or just
>       replace the "main" ones?
>       For explanation: minimal archspec means dropping all -mmx
>       -m3dnow and similar flags when -march already includes them.
>       I am in favor of dropping these extra flags in the main specs.

I also think we should replace the main ones with minimal. IMHO the list and 
checkbox menus in sorcery's arch optim section should offer only the basics, 
users can use the custom fields for additional stuff.

>       2. Related but special, perhaps: Should archspecs include
>       -mfpmath=sse per default? Some say it's super-cool, others say
>       it depends. I guess others are right.
>       I just tested with my Pentium-M laptop; decoding time with
>       mpg123. Plain -march=pentium-m wins against added -mfpmath=sse,
>       where an additional -msse does not make any difference.
>       It looks like SSE fpmath sucks a bit here, and thus is not
>       enabled by the -march -- it _is_ enabled for x86_64, though. I
>       vote for omitting it and so let users add it if they really
>       mean it. We should give a sane default with no experiments.

Testing on one box doesn't of course tell much. But if this flag is included 
or omitted in -march depending on the architecture, doesn't that mean that we 
should trust the gcc folk and not enforce it?

>       3. -m64 for 64 bit arch? Is not needed because 64 bit compiler
>       defaults to it anyway. It was noted that some spell may depend
>       on this to properly fail if it only can work with 32 bits (wine?). I
>       say the info is in CHOST and the SMGL_COMPAT_ARCHS array -
>       make the spell use it. It was also noted that this flag may hinder
>       compilation of 32bit stuff (when we support 64 and 32bit compiler).

Sounds like the upstream defaults and the examples you mentioned favor also 
not enforcing this flag.

About the stable update: One way of making sure that smgl-archspecs is cast 
before other stuff is to make all spells in basesystem depend on it. But if 
users do a simple `sorcery system-update`, there's no way to prompt them to 
check their settings.

-- 
        Juuso Alasuutari
[[ Source Mage GNU/Linux ]]

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