[U-Boot-Users] Re: Re: [uClinux-dev] uboot compilation error when using the toolchain arm-elf-tools from uClinux.org

[David McCullough]

Jivin Shawn Jin lays it down ...
> Dear David,
> 
> > > The code is extracted from the header file processor.h.
> > >
> > > 51> union debug_insn {
> > > 52>      u32     arm;
> > > 53>      u16     thumb;
> > > 54> };
> > > 55>
> > > 56> struct debug_entry {
> > > 57>        u32                     address;
> > > 58>        union debug_insn        insn;
> > > 59> };
> > >
> > > However I really don't think there is any syntax error. It might be a
> > > toolchain problem?
> > 
> > I think,  at least for that version of the toolchain,  it implicitly
> > defines "arm",  and I suspect it defines it to be "1",  thus the errors
> > you are seeing.  You may be able to add a -Uarm to eth build line,
> 
> It did solve the problem. Thank you!
> 
> Would you please explain a little bit more why the toolchain
> implicitly defines "arm"? Should or should not for a toolchain to
> define this? Or we can simply re-name "arm" in struct debug_insn to
> another name?

Most compilers predefine a number of things to help coders port/identify
what the code is being built for.  For example,  on a coldfire target
__mcf5200 may be defined.  Have a look at:

	http://www.ucdot.org/article.pl?sid=02/10/02/035241

I don't think the newer gcc's define "arm" and I cannot recall why the
current 2.95.3 compiler does,  but if you can easily change the name of
that field in the structure it would be the safest option IMO,

Cheers,
Davidm

-- 
David McCullough, davidm at snapgear.com  Ph:+61 7 34352815 http://www.SnapGear.com
Custom Embedded Solutions + Security   Fx:+61 7 38913630 http://www.uCdot.org