hardened-sources make failure on ARM

[grant123]

I get the below atomic64_sub_return messages throughout the make until it finally fails on my ARM device. Should I file a bug?

from include/linux/time.h:5,
from include/linux/stat.h:18,
from include/linux/module.h:10,
from block/cfq-iosched.c:9:
/usr/src/linux-3.13.3-hardened-r1/arch/arm/include/asm/atomic.h: In function ‘atomic64_sub_return’:
/usr/src/linux-3.13.3-hardened-r1/arch/arm/include/asm/atomic.h:716:1: warning: no return statement in function returning non-void [-Wreturn-type]
LD block/built-in.o
CC grsecurity/grsec_chdir.o
In file included from include/linux/atomic.h:4:0,
from include/linux/debug_locks.h:5,
from include/linux/lockdep.h:23,
from include/linux/spinlock_types.h:18,
from include/linux/spinlock.h:81,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/uapi/linux/timex.h:56,
from include/linux/timex.h:56,
from include/linux/sched.h:17,
from grsecurity/grsec_chdir.c:2:
/usr/src/linux-3.13.3-hardened-r1/arch/arm/include/asm/atomic.h: In function ‘atomic64_sub_return’:
/usr/src/linux-3.13.3-hardened-r1/arch/arm/include/asm/atomic.h:716:1: error: no return statement in function returning non-void [-Werror=return-type]
cc1: all warnings being treated as errors
make[1]: *** [grsecurity/grsec_chdir.o] Error 1
make: *** [grsecurity] Error 2

[Hu]

Yes. Does it work in sys-kernel/gentoo-sources?

[grant123]

It works great in gentoo-sources. I'll file a bug.

[N8Fear]

Are you compiling with -Werror ?

Just thinking because of

[grant123]

I don't have that explicitly set anywhere.

[Hu]

It looks like that is set by the Makefile for grsecurity-specific files. Look how when building block/cfg-iosched.c, the diagnostic is a warning, but when building grsecurity/grsec_chdir.c, the diagnostic is an error. This suggests to me that the grsecurity directory uses stricter flags.

[grant123]

Here's the bug for reference:

https://bugs.gentoo.org/show_bug.cgi?id=502058