[U-Boot] [U-Boot, v5] Makefile: add a new script to check -fstack-usage support

[Tom Rini]

On Wed, Dec 11, 2013 at 08:11:34PM +0900, Masahiro Yamada wrote:

> If -fstack-usage option is given to crosstools
> that do not support it, gcc displays a warning message
> but still exits with status 0.
> 
> This means we can not rely on $(call cc-option,...)
> to detect if -fstack-usage option is supported or not.
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
> 
> ---
> Some crosstools currently do not support -fstack-usage option.
> For example, bfin-uclinux-gcc, which is available at
> https://www.kernel.org/pub/tools/crosstool/
> 
> If -fstack-usage option is given to such crosstools,
> gcc displays a warning message as follows:
> 
>     warning: -fstack-usage not supported for this target [enabled by default]
> 
> But it still exits with status 0.
> 
> So, $(call cc-option,-fstack-usage) does not work as we expect
> because cc-option checks exit status
> to judge whether the given option is supported or not.
> 
> 
> Changes in v5:
>   - Rebased on Kbuild series
> 
> Changes in v4:
>   - Drop executable permission of scripts/gcc-stack-usage.sh
>   - Fix commit log
>   - Add the rationale below ---

We still want this, and it's still applicable right?

-- 
Tom
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