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

[Jonathan Wakely <jwakely at redhat dot com>]

On 30/11/16 22:32 +0100, Christophe Lyon wrote:
> 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?

I did wonder that.

The newlib config is hardcoded, which probably covers a lot of the
cross builds in regular use.

> > 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.