Re: newlib on powerpc-eabi with soft-float

[Joel Sherrill <joel dot sherrill at OARcorp dot com>]

Christopher Jenkins wrote:
> 
> Hi,
> 
> I'm trying to build a toolchain for a powerpc-eabi target on an RS/6000 AIX
> host. I can successfully build and use the following:
> 
> binutils-2.12
> gcc-2.95.3
> newlib-1.10.0
> 
> However, the target processor (MC8260) has no floating point unit 

Are you sure about that?  According to this:

http://e-www.motorola.com/brdata/PDFDB/docs/MPC8260TS.pdf
and my paper copy of a Motorola PowerPC selector guide 
it has an FPU.   Sounds more like the startup code is 
not enabling the FPU to me.

> and I'm
> not sure whether Newlib is aware of this. Specifically, in setjmp.S, there
> are a few lines of code to save the floating point registers (which the
> MC8260 does not have) wrapped in an #ifndef _SOFT_FLOAT.  I'm guessing that
> _SOFT_FLOAT should be being defined somewhere, but I'm not sure where. Is
> there any option that I can give to the configuration script such that this
> macro will be defined? I'm not too keen on hacking the code since I'm sue
> that there must be another way...
> 
> Incidentally, I already give the --nfp switch to the configuration scripts
> of binutils, gcc and newlib, but this doesn't seem to have much of an
> effect.
> 
> Cheers,
> 
> Chris
> 
> Chris Jenkins
> IBM UK Laboratories
> Chris.Jenkins@uk.ibm.com
> 
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