using non-standard optflags (-O3, in particular)

[lonely wolf]

On 02/08/2007 11:47 PM, Matthew Miller wrote:
> I'm working on building calc, a math package, for Extras. Upstream says:
>
>    There is a slight performance advantage with -O3.  We have some
>    users who run very long calc computations (on the order of months of
>    CPU time). So even slight advantages are useful. Between your EMail
>    message and this one, we received a plea from one of those massive
>    computation calc users to keep -O3.
>
>
> Given the nature of the package, this seems reasonable. Is there a
> standard mechanism for overriding part of optflags like this?
>
>
> Upstream also would prefer -g3 -- is there a problem with that?
>
>   
Take a look at  
http://fedoraproject.org/wiki/JochenSchmitt/RemoveCFlagsFromRpmOptFlag . 
Maybe this method can help.