Re: ARM issues (was: Re: Error on compile)

On Fri, Jul 09, 2010 at 04:52:58PM +0200, Felix von Leitner wrote:
> 
> I'm having a different problem right now.  I updated my ARM toolchain to
> gcc 4.5 and now it does not compile any arm code for me anymore.  The
> error message is:
> 
> arm/start.S:1:0: error: FPA is unsupported in the AAPCS

EABI uses IEEE-754 floating point format, FPA format is history.

> This is caused by -mabi=aapcs-linux, which was given to me as the option
> to pass to gcc to get EABI support.  Can some ARM specialist please find
> out how to fix this, preferable in a way that does not require me to run
> gcc twice (once to find out the version)?

How did you configure your toolchain?  --with-float=soft ?

I guess you used hard float for smaller code size.
What is your target CPU?  For ARMv4 architecture FPA was default,
for ARMv5 it is VFP -- and EABI is only specified for ARMv5+
(although there is a kludge for ARMv4).
The Linux kernel contains a VFP emulator.

Try one or more of:
  -march=armv5
  -mfloat-abi=softfp
  -mfpu=vfp

but you better fix your gcc configuration to get a working libgcc.


HTH,
Johannes