On 2016-10-20 17:54 +0200, Bálint Réczey wrote: > Control: reassign -1 linux 4.7.8-1 > Control: severity -1 serious > Control: tags -1 patch > > Hi David, > > 2016-10-20 14:02 GMT+02:00 David Weinehall <t...@debian.org>: >> Package: gcc-6 >> Severity: important >> Version: 6.2.0-7 >> >> --enable-default-pie (first enabled in gcc-6 6.2.0-7) causes kernel >> builds to fail. If the kernel is configured with the stack protector >> enabled it'll fail with a rather unhelpful error message claiming >> that the compiler doesn't support -fstack-protector, >> but the problem is in fact caused by: >> >> kernel/bounds.c:1:0: error: code model kernel does not support PIC mode >> >> (The kernel is built with -mcmodel=kernel) >> >> I think it's fair to say that the kernel is kind of an important piece >> of software and that it's imperative that we don't break kernel builds... > > The kernel is very important indeed and it did break in our build test. > I'm sorry, somehow I missed filing bug for the linux package, just for > user-mode-linux. > The following patch fixes the FTBFS: > > --- linux-4.7.8/debian/rules.d/Makefile.inc > +++ linux-4.7.8/debian/rules.d/Makefile.inc > @@ -5,7 +5,8 @@ > > SHELL = /bin/sh -e > > -CC = $(CROSS_COMPILE)gcc > +CC = $(CROSS_COMPILE)gcc -no-pie > +LD = $(CROSS_COMPILE)ld -no-pie > CXX = $(CROSS_COMPILE)g++ > CFLAGS := $(shell dpkg-buildflags --get CFLAGS) -Wall > CPPFLAGS := $(shell dpkg-buildflags --get CPPFLAGS) \ > > Maybe the ld part is obsolete, I have not checked that.
That patch might work for the Debian package, but has anybody contacted the upstream kernel developers about that? At least the 4.8.3 vanilla kernel fails in the same way, I haven't tested 4.9-rc1 yet. FWIW, this issue has been discussed in Ubuntu for six months(!), see https://bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1574982. Cheers, Sven
