RE: Some basic questions from a novice !

[Frank Juergen-r58616 <Juergen dot Frank at freescale dot com>]

Yep, I know this works but I think this work only in case your selected core and the default core are similar. 
I use a 3.4 version of gcc and a this version compiled the libraries for the following version 


mycross-gcc --print-multi-libs

.;
mpc7400;@mcpu=7400
nof;@msoft-float
le;@mlittle
no-spe/no-abi-spe/no-isel;@mspe=no@mabi=no-spe@misel=no
no-spe/no-abi-spe/no-isel/le;@mspe=no@mabi=no-spe@misel=no@mlittle
nof/le;@msoft-float@mlittle
mpc7400/nof;@mcpu=7400@msoft-float
mpc7400/le;@mcpu=7400@mlittle
mpc7400/nof/le;@mcpu=7400@msoft-float@mlittle
mpc7400/altivec/abi-altivec;@mcpu=7400@maltivec@mabi=altivec
mpc7400/altivec/abi-altivec/le;@mcpu=7400@maltivec@mabi=altivec@mlittle

So if you use this with setup with the 603 it works, but if you try to use a core with a subset of instruction set from the normal PPC, you can't use this setup.

I dig in the internet and in the gcc directories and I think the key is the multilib functionality.

	Juergen



-----Original Message-----
From: Amir Bukhari [mailto:ufz6@rz.uni-karlsruhe.de] 
Sent: Dienstag, 3. Januar 2006 13:03
To: Frank Juergen-r58616
Subject: RE: Some basic questions from a novice !

 
>  
> I want to use GCC ( powerpc-eabi ) with newlib.
> How it is possible to use diff. powerpc cores which has diff. 
> instructions sets (or subset) for example I want to compile a program 
> for the 603e, PPC405 and for the 8540. With and without 
> hardware-floating point. What is the best way to do this ? I try the 
> CFLAGS_FOR_TARGET = "-mhard-float -mcpu=603e", but if I set this 
> environment variable I can't compile newlib anymore !
> Finally, I want my own newlib versions for every core ... any hints 
> and ideas ?

You don't need to specify which powerpc cpu you should use with newlib. You just need to compile newlib with default options and use "-mcpu=603e" when you compile your program and link it with newlib. I use this way and it work.


-Amir