[PATCH, libstdc++] Fix detection of posix_memalig for cross-builds

[Christophe Lyon]

On 30 November 2016 at 20:00, Bernd Edlinger <bernd.edlinger@hotmail.de> wrote:
> Hi,
>
> I noticed that a cross-compiler produces an unusable libstdc++.so
> that contains an unresolved reference to aligned_alloc instead of
> posix_memalign, or whatever is actually available.
>
> Therefore it is impossible to link any C++ programs against the
> libstdc++.so that comes with the cross-compiler.
>
> That happens for instance in the following configuration:
> --target=arm-linux-gnueabihf.
>

How could this be unnoticed so far?

> The attached patch adds a link test for the memalign function
> and fixes the cross-build for me.
>
> Is it OK for trunk?
>
>
> Thanks
> Bernd.