Re: PPC cflags

On my new 12" Aluminum PowerBook, I'm using the following with no 
problems (results in spankin-fast binaries, too):

CFLAGS="-O2 -pipe -mcpu=7450 -maltivec -mabi=altivec -mpowerpc-gfxopt 
-fsigned-char -mstring -mmultiple"
CHOST="powerpc-unknown-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j3"

chris.

:: Christopher Gautam Hota
:: Information Technology Specialist
:: MidSOUTH at UALR
:: [email protected]
:: (501) 683-7339 desk
:: (501) 413-1176 cell

|| Microsoft Certified Systems Engineer
|| Windows XP / Server 2003



Carl Hudkins wrote:

>On Sat February 19 2005 21:49, Nick Smith wrote:
>
>  
>
>><quote who="Drew Kirkpatrick">
>>
>>    
>>
>>>I've got a Blueberry iBook, with a 300 MHz ppc, and these seem
>>>very
>>>stable to me:
>>>
>>>CFLAGS="-O2 -mtune=G3  -pipe"
>>>      
>>>
>
>  
>
>>well the default file that game with the install has:
>>CFLAGS="-02 -mtune=powerpc -fno-strict-aliasing -pipe"
>>    
>>
>
> (Note that your "-O2" needs to contain a letter O, not a number zero, as you 
>have typed above... otherwise, I'm sure it will puke.)
>
>  
>
>>i was just tring to add some more and it puked, do you know what
>>the differences are between the G3 and powerpc flags? what
>>should i be using? is one better that the other?
>>    
>>
>
> Here on a 450 MHz G3, I've been using these flags for many months with no 
>problems:
>
>CFLAGS="-O3 -mcpu=G3 -maltivec -mabi=altivec -fno-strict-aliasing -pipe"
>
> As to the difference between G3 and powerpc, G3 is a subset of the larger 
>category, powerpc.  PPC machines are made by Apple, IBM, and others; G3 is a 
>very specific version, among the processors that implement the PowerPC 
>instruction set.  So, by specifying G3, we are telling the compiler exactly 
>what kind of CPU we have, so that it can enable any processor-specific 
>performance enhancements.
>
> I mostly found the information on CFLAGS from the GCC documentation.  You can 
>view the GCC info pages to find it, and if you use KDE you can paste these 
>into Konqueror to go directly to the relevant sections:
>
>info:/gcc/Optimize Options
>info:/gcc/RS/6000 and PowerPC Options
>
> Good luck!
>
>  
>

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