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

From: Jonathan Wakely <jwakely at redhat dot com>
To: Bernd Edlinger <bernd dot edlinger at hotmail dot de>
Cc: "libstdc++ at gcc dot gnu dot org" <libstdc++ at gcc dot gnu dot org>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Wed, 30 Nov 2016 20:05:44 +0000
Subject: Re: [PATCH, libstdc++] Fix detection of posix_memalig for cross-builds
Authentication-results: sourceware.org; auth=none
References: <AM4PR0701MB2162A9E9F378D3BF2D9BE6E6E48C0@AM4PR0701MB2162.eurprd07.prod.outlook.com>

On 30/11/16 19:00 +0000, Bernd Edlinger 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.

The attached patch adds a link test for the memalign function
and fixes the cross-build for me.

Is it OK for trunk?


OK.

Presumably we should have this for other cross targets too.

References:
- [PATCH, libstdc++] Fix detection of posix_memalig for cross-builds
  - From: Bernd Edlinger

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