[PATCH] powerpc: Better 32/64bit detection

[Denys Vlasenko]

On 07/11/2013 04:03 AM, Anton Blanchard wrote:
> 
> We were using uname to determine if userspace was 32 or 64bit.
> This fails when we have a 64bit kernel and a 32bit userspace.
> 
> Similar to x86, use a runtime test to determine if we are 32 or 64bit.
> 
> Signed-off-by: Anton Blanchard <anton at samba.org>
> ---
> 
> Index: strace-new/configure.ac
> ===================================================================
> --- strace-new.orig/configure.ac
> +++ strace-new/configure.ac
> @@ -54,7 +54,11 @@ alpha*)
>  powerpc*)
>  	arch=powerpc
>  	AC_DEFINE([POWERPC], 1, [Define for the PowerPC architecture.])
> -	if test $host_cpu = powerpc64; then
> +	AC_TRY_COMPILE(
> +[#ifndef __LP64__
> +# error 32 bit
> +#endif], [], ppc_bits=64, ppc_bits=32)
> +	if test "$ppc_bits" = "64"; then
>  		AC_DEFINE([POWERPC64], 1, [Define for the PowerPC64 architecture.])
>  	fi
>  	;;


I can't apply this - I am woefully uneducated about autoconf stuff.

Dmitry or somebody else needs to take a look.