verify NEON support in cross toolchain

[Javier Viguera]

Hi all,

Just for if it help attached a patch i have locally that applies to 
crosstool-ng-1.8.2 which adds support for "softfp" optimized toolchains.

Some background: I needed a cortex_a8 optimized toolchain for some of 
our embedded products. Crosstool-NG allows to optimize somewhat the 
toolchain through:

"Architecture level"
"Emit assembly for CPU"
"Tune for CPU" options

but on the Floating point option it only allows to *soft* and *hard*.

According to GCC man page:

> Use -mfloat-abi=softfp with the appropriate -mfpu option to allow the compiler
> to generate code that makes use of the hardware floating-point capabilities
> for these CPUs

To have a toolchain which defaults to "-mfloat-abi=softfp" you need to 
pass "--with-float=softfp" instead of "--with-float=soft|hard" which is 
what crosstool-ng is doing when building GCC.

With my basic knowledge on how crosstool-ng works i created a patch to 
solve this problem for us. The patch is posted here for if it helps 
someone or with some rework may be included in future releases of 
crosstool-ng.

The patch is based on version 1.8.2.

-- 
Regards,

Javier Viguera

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