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Re: [PATCH] x32: Set GLRO(dl_platform) to "x86_64" by default [BZ #22363]

On 10/30/2017 08:05 AM, Andreas Schwab wrote:

On Okt 29 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:


Set dl_platform to "x86_64" for x32 by default since kernel may set it
to "i686".


Why does it do that?  Isn't that a kernel bug?
The whole thing is a bit iffy. Why does the kernel set AT_PLATFORM to i686 when running on a x86_64 machine? x86_64 would make more sense because it allows the loader to select libraries which were compiled with -march=x86-64. I think AT_PLATFORM should be about CPU capabilities, not the initial CPU mode after process creation. The latter requires separate search paths anyway. 

Thanks,
Florian
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