Question: __ARM_EABI__

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Wed, Jan 13, 2010 at 04:10:41PM -0500, H Hartley Sweeten wrote:
> I'll take your word on that.
> 
> But, based on the code I would not expect to see the message at all:
> 
> #if !defined (__ARM_EABI__)
> #warning Your compiler does not have EABI support.
> #warning    ARM unwind is known to compile only with EABI compilers.
> #warning    Change compiler or disable ARM_UNWIND option.
> #elif (__GNUC__ == 4 && __GNUC_MINOR__ <= 2)
> #warning Your compiler is too buggy; it is known to not compile ARM unwind support.
> #warning    Change compiler or disable ARM_UNWIND option.
> #endif
> 
> I'm getting this during the compile:
> 
>   CHECK   arch/arm/kernel/unwind.c
> arch/arm/kernel/unwind.c:30:2: warning: Your compiler does not have EABI support.
> arch/arm/kernel/unwind.c:31:2: warning: ARM unwind is known to compile only with EABI compilers.
> arch/arm/kernel/unwind.c:32:2: warning: Change compiler or disable ARM_UNWIND option.

If you get an oops with your compiler version and you have unwind
support enabled, you _will_ _not_ get a backtrace.  That's because
EABI support in gcc 4.3.2 is incomplete.

As the message says, either use a later compiler or disable unwind
support.