Re: "PIE by default" transition is underway -- wiki needs updating
On Wed, 26 Oct 2016, Adrian Bunk wrote:
> On Wed, Oct 26, 2016 at 05:37:06AM +0200, Adam Borowski wrote:
> > On Wed, Oct 26, 2016 at 12:37:18AM +0200, Andreas Cadhalpun wrote:
> > > The current policy says:
> > > "As to the static libraries, the common case is not to have relocatable code"
> > >
> > > As of gcc-6 version 6.2.0-7 this is factually wrong, because the compiler
> > > enables PIE by default, which means it produces relocatable code.
> > > This should definitely be updated to reflect reality.
> >
> > It's not that simple. The compiler enables PIE by default only:
> > * if you use "gcc" or "gcc-6". gcc-5, clang, even gcc-snapshot still
> > default to non-PIE.
>
> The intention is that gcc-6 will be the only gcc version in stretch.
It needs to be able to compile the kernel correctly, first. Which it
might not be able to right now (gcc 6.2.0), if one goes by code
generation issues reported in LKML (for other distros). Hopefully it
will be fixed upstream by the time stretch is out, but it *is* a current
concern.
Also, the upstream kernel source needs to be fixed to deal with PIE
enabled by default (it is highly allergic to that). This is already
ongoing AFAIK.
--
Henrique Holschuh
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