Bug#841420: --enable-default-pie breaks kernel builds

["S. R. Wright" <srw6666@gmail.com>]

I agree with Eric;  while the workaround is to back rev the gcc and its 
associated packages,  I also build kernels straight from kernel.org, 
usually within hours of their availability and this has been working for 
me for many years,  and it is not sufficient to justify this change by 
saying doing so "isn't a good idea."  A change of functionality of this 
scope warrants a minor version number increase,  this change was not 
merely a bug fix.

As the kernel is the most important code gcc is ever likely to compile 
on debian or any other distro for that matter,  this change should be 
backed out,  and not reintroduced UNTIL the *official* kernel source is 
ready for it.

-- sRw

On 10/21/2016 06:43 AM, Wolfgang Walter wrote:
> On Friday, 21 October 2016 14:45:25 CEST Ritesh Raj Sarraf wrote:
> > The Debian kernel packages still have a dependency on gcc-5, which may mean
> > that the kernels are currently only built/supported with gcc-5.
> vanilla kernels (Linus' tree and the stable ones) could be compiled just fine
> with gcc 6.2.0-6 and that now fails.
>
> I still think this is a major regression and regard gcc 6.2.0-7 simply as
> broken.
>
> > On Thu, 2016-10-20 at 11:22 -0500, S R Wright wrote:
> > > Concurring with Wolfgang;  pulling the source straight from kernel.org
> > > and using identical .config files will work with 6.2.0-6 but fail with
> > > 6.2.0-7.   I was able to build and install 4.8.3 with no issues after
> > > back-revving gcc et. al. to 6.2.0-6
> > >
> > > -- sRw
> > >
> > > On 10/20/16 11:09, Wolfgang Walter wrote:
> > > > Hello,
> > > >
> > > > with this version of gcc-6 I can't build vanilla kernels any more. It
> > > > fails
> > > > with even with CC_STACKPROTECTOR_STRONG disabled:
> > > >
> > > > scripts/kconfig/mconf  Kconfig
> > > > configuration written to .config
> > > >
> > > > *** End of the configuration.
> > > > *** Execute 'make' to start the build or try 'make help'.
> > > >
> > > > ksrc@ei:~/build/kernels/linux-4.8.3$ make
> > > > scripts/kconfig/conf  --silentoldconfig Kconfig
> > > >     CHK     include/config/kernel.release
> > > >     CHK     include/generated/uapi/linux/version.h
> > > >     CHK     include/generated/utsrelease.h
> > > >     UPD     include/generated/utsrelease.h
> > > >     CC      kernel/bounds.s
> > > > kernel/bounds.c:1:0: error: code model kernel does not support PIC mode
> > > >    /*
> > > >    
> > > > Kbuild:45: recipe for target 'kernel/bounds.s' failed
> > > > make[1]: *** [kernel/bounds.s] Error 1
> > > > Makefile:1015: recipe for target 'prepare0' failed
> > > > make: *** [prepare0] Error 2
> > > >
> > > >
> > > > I think this is a major regression if you can't build vanilla and stable
> > > > kernels any more.
> > > >
> > > > Regards,
> Regards,