Bug#841368: gcc-6 6.2.0-7 breaks kernel build if stack protection is enabled

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

I agree.  When the version changes from 6.2.0-6 to 6.2.0-7,  only bug 
fixes should be included,  not changes in functionality.  In this case 
setting enable-default-pie essentially broke backwards compatibility.  
Kernel code that built in -6 failed to build in -7.  That, I agree,  
should be considered a bug,  and the change should be rolled back.

-- sRw

On 10/20/2016 05:49 PM, Ben Hutchings wrote:
> On Fri, 2016-10-21 at 01:21 +0300, Konstantin Demin wrote:
> > It's not a GCC bug but kind of new feature.
> It's a bug when a compiler fails to compile valid code.
>
> Ben.
>
> > Take a look at this changelog entry:
> >   gcc-6 (6.2.0-7) unstable; urgency=medium
> >
> >     [ Matthias Klose ]
> >     * Configure with --enable-default-pie and pass -z now when pie is enabled;
> >       on amd64 arm64 armel armhf i386 mips mipsel mips64el ppc64el s390x.
> >       Closes: #835148.
> >
> > Starting at gcc 6.2.0-7 we must provide "-fno-PIE -fno-PIC" in
> > beginning of CFLAGS to build kernel successfully.
> >
> > I'm currently looking for correct way to do this trick.