Open-Mesh » batman-adv

Trying to compile batman-adv (current master) with gcc optimizations disabled fails with the following error message:

/usr/bin/make CONFIG_BATMAN_ADV_DEBUG=y CHECK="sparse -Wsparse-all -Wno-ptr-subtraction-blows -Werror -D__CHECK_ENDIAN__ -DDEBUG" CC=cgcc KERNELPATH=/home/tux/mesh-node/usr/src/linux-headers-4.8.0-rc7+ CONFIG_BATMAN_ADV_BATMAN_V=y CONFIG_BATMAN_ADV_DAT=y CONFIG_BATMAN_ADV_MCAST=y EXTRA_CFLAGS="-O0" 
/home/tux/dev/batman-adv-t_x/gen-compat-autoconf.sh /home/tux/dev/batman-adv-t_x/compat-autoconf.h
/usr/bin/make -C /home/tux/mesh-node/usr/src/linux-headers-4.8.0-rc7+ M=/home/tux/dev/batman-adv-t_x/build PWD=/home/tux/dev/batman-adv-t_x/build REVISION=2016.4-76-g7c21738 CONFIG_BATMAN_ADV=m CONFIG_BATMAN_ADV_DEBUG=y CONFIG_BATMAN_ADV_DEBUGFS=y CONFIG_BATMAN_ADV_BLA=y CONFIG_BATMAN_ADV_DAT=y CONFIG_BATMAN_ADV_NC=n CONFIG_BATMAN_ADV_MCAST=y CONFIG_BATMAN_ADV_BATMAN_V=y INSTALL_MOD_DIR=updates/  modules
make[1]: Entering directory '/home/tux/mesh-node/usr/src/linux-headers-4.8.0-rc7+'
  CC [M]  /home/tux/dev/batman-adv-t_x/build/net/batman-adv/../../../compat-sources/net/core/skbuff.o
  CC [M]  /home/tux/dev/batman-adv-t_x/build/net/batman-adv/../../../compat-sources/net/ipv4/igmp.o
  CC [M]  /home/tux/dev/batman-adv-t_x/build/net/batman-adv/../../../compat-sources/net/ipv6/mcast_snoop.o
  CC [M]  /home/tux/dev/batman-adv-t_x/build/net/batman-adv/bat_algo.o
  CC [M]  /home/tux/dev/batman-adv-t_x/build/net/batman-adv/bat_iv_ogm.o
In file included from /home/tux/dev/batman-adv-t_x/build/../compat-include/linux/rculist.h:25:0,
                 from ./include/linux/sched.h:45,
                 from ./include/linux/kasan.h:4,
                 from ./include/linux/slab.h:118,
                 from /home/tux/dev/batman-adv-t_x/build/../compat-include/linux/slab.h:25,
                 from ./include/linux/textsearch.h:8,
                 from ./include/linux/skbuff.h:30,
                 from /home/tux/dev/batman-adv-t_x/build/../compat-include/linux/skbuff.h:25,
                 from ./include/linux/if_ether.h:23,
                 from /home/tux/dev/batman-adv-t_x/build/../compat-include/linux/if_ether.h:25,
                 from ./include/linux/etherdevice.h:25,
                 from /home/tux/dev/batman-adv-t_x/build/../compat-include/linux/etherdevice.h:25,
                 from /home/tux/dev/batman-adv-t_x/build/net/batman-adv/main.h:189,
                 from /home/tux/dev/batman-adv-t_x/build/net/batman-adv/bat_iv_ogm.h:21,
                 from /home/tux/dev/batman-adv-t_x/build/net/batman-adv/bat_iv_ogm.c:18:
./include/linux/rculist.h: In function ‘hlist_add_head_rcu’:
./include/linux/rculist.h:485:922: error: call to ‘__compiletime_assert_485’ declared with attribute error: Need native word sized stores/loads for atomicity.
  rcu_assign_pointer(hlist_first_rcu(h), n);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          ^
scripts/Makefile.build:289: recipe for target '/home/tux/dev/batman-adv-t_x/build/net/batman-adv/bat_iv_ogm.o' failed
make[3]: *** [/home/tux/dev/batman-adv-t_x/build/net/batman-adv/bat_iv_ogm.o] Error 1
scripts/Makefile.build:440: recipe for target '/home/tux/dev/batman-adv-t_x/build/net/batman-adv' failed
make[2]: *** [/home/tux/dev/batman-adv-t_x/build/net/batman-adv] Error 2
Makefile:1471: recipe for target '_module_/home/tux/dev/batman-adv-t_x/build' failed
make[1]: *** [_module_/home/tux/dev/batman-adv-t_x/build] Error 2
make[1]: Leaving directory '/home/tux/mesh-node/usr/src/linux-headers-4.8.0-rc7+'
Makefile:90: recipe for target 'all' failed
make: *** [all] Error 2

I tried compiling for a 4.8-rc7 and a 4.9-rc3 kernel and various others, which are all failing. 3.14 works though while 3.15 doesn't, so seems to be related to some change introduced with 3.15.

GCC version is from Debian stable:

$ gcc --version
gcc-4.9.real (Debian 4.9.2-10) 4.9.2
[...]

Also, all v2015.x and v2016.x batman-adv versions fail, too.