[Buildroot] [RFC PATCH] toolchain-external: instrument wrapper to warn about unsafe paths

[Baruch Siach <baruch@tkos.co.il>]

Hi Thomas,

On Tue, Feb 11, 2014 at 12:28:01AM +0100, Thomas Petazzoni wrote:
> The CodeSourcery toolchains have a very interesting feature: they warn
> the user when an unsafe header or library path is used, i.e a path
> that will lead host headers or libraries to leak into the build.
> 
> This commit adds a similar functionality into our external toolchain
> wrapper, so that it can be used with all external toolchains, and can
> also be tuned as needed. By default, the external toolchain wrapper
> now gives warnings such as:
> 
>   WARNING: unsafe header/library path used in cross-compilation: '-I /usr/foo'
>   WARNING: unsafe header/library path used in cross-compilation: '-L /usr/bleh'

I'd mention that this makes Buildroot builds under /usr even more problematic. 
I thought this limitation appears in the documentation, but I can't find it 
there now.

baruch

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