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Date:      Sun, 4 Jan 2015 19:24:42 +0100
From:      Torfinn Ingolfsen <torfinn.ingolfsen@getmail.no>
To:        freebsd-arm@FreeBSD.org
Subject:   How to turn off -Werror for kernel build?
Message-ID:  <20150104192442.3eab6a92c51a51094dbd5121@getmail.no>

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I am trying to build an image for a Samsung Chromebook 2 (model XE503C32, "Peach Pi")[4].
I am following this[1] wiki page. And I'm using the build script[2] Ian Lepore shared with us last year.
The build machine runs FreeBSD 9.3-stable:
tingo@kg-core1$ uname -a
FreeBSD kg-core1.kg4.no 9.3-STABLE FreeBSD 9.3-STABLE #0 r273918: Fri Oct 31 22:52:44 CET 2014
     root@kg-core1.kg4.no:/usr/obj/usr/src/sys/GENERIC  amd64
I am trying to build latest -current (revision 276660).
Initially, config/make.conf and config/src.conf are empty.
The kernel config file looks like this:
tingo@kg-core1$ more config/CB2
# kernel config file for Chromebook 2 Peach Pi

include         "CHROMEBOOK-PEACH-PIT"
ident           CHROMEBOOK-PEACH-PI

#hints          "CHROMEBOOK-PEACH-PIT.hints"

options        ROOTDEVNAME=\"ufs:/dev/da0p3\"

./mk buildworld works
./mk buildkernel fails with this:
tingo@kg-core1$ ./mk buildkernel
[... snipped for brevity ...]
--- trap-v6.o ---
cc  -c -O -pipe  -g -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions  -Wmissing-include-dirs -fdiagnostics-show-option  -Wno-unknown-pragmas   -nostdinc  -I. -I/zs/tingo/work/chromebook/cb2/src/sys -I/zs/tingo/work/chromebook/cb2/src/sys/contrib/altq -I/zs/tingo/work/chromebook/cb2/src/sys/contrib/libfdt -I/zs/tingo/work/chromebook/cb2/src/sys/gnu/dts/include -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -march=armv7a -funwind-tables -ffreestanding -gdwarf-2  -fno-common -finline-limit=8000 --param inline-unit-growth=100 --param large-function-growth=1000 -mno-thumb-interwork -std=iso9899:1999 -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions  -Wmissing-include-dirs -fdiagnostics-show-option  -Wno-unknown-pragmas    -Werror  /zs/tingo/wor
 k/chromebook/cb2/src/sys/arm/arm/trap-v6.c
cc1: warnings being treated as errors
/zs/tingo/work/chromebook/cb2/src/sys/arm/arm/trap-v6.c: In function 'abort_handler':
/zs/tingo/work/chromebook/cb2/src/sys/arm/arm/trap-v6.c:280: warning: 'rv' may be used uninitialized in this function
*** [trap-v6.o] Error code 1

bmake[1]: stopped in /zs/tingo/work/chromebook/cb2/obj/arm.armv6/zs/tingo/work/chromebook/cb2/src/sys/CB2
1 error

bmake[1]: stopped in /zs/tingo/work/chromebook/cb2/obj/arm.armv6/zs/tingo/work/chromebook/cb2/src/sys/CB2
*** [buildkernel] Error code 2

bmake: stopped in /zs/tingo/work/chromebook/cb2/src
1 error

bmake: stopped in /zs/tingo/work/chromebook/cb2/src
*** [buildkernel] Error code 2
1 error
       39.78 real        82.19 user        13.60 sys
so I try to "fix" it by turning off -Werror for kernel builds. According to this page[3], you can do that either in src.conf or in make.conf.
I try src.conf first:
tingo@kg-core1$ more config/src.conf
# build world without -Werror
NO_WERROR=
# build kernel without -Werror
WERROR=
(yes, I also tried NO_WERROR, but that didn't help either).

but warnings are still treated as errors?
tingo@kg-core1$ ./mk buildkernel
[...]
--- trap-v6.o ---
cc1: warnings being treated as errors
/zs/tingo/work/chromebook/cb2/src/sys/arm/arm/trap-v6.c: In function 'abort_handler':
/zs/tingo/work/chromebook/cb2/src/sys/arm/arm/trap-v6.c:280: warning: 'rv' may be used uninitialized in this function
*** [trap-v6.o] Error code 1

bmake[1]: stopped in /zs/tingo/work/chromebook/cb2/obj/arm.armv6/zs/tingo/work/chromebook/cb2/src/sys/CB2
1 error

bmake[1]: stopped in /zs/tingo/work/chromebook/cb2/obj/arm.armv6/zs/tingo/work/chromebook/cb2/src/sys/CB2
*** [buildkernel] Error code 2

bmake: stopped in /zs/tingo/work/chromebook/cb2/src
1 error

bmake: stopped in /zs/tingo/work/chromebook/cb2/src
*** [buildkernel] Error code 2
1 error
       38.41 real        82.90 user        13.57 sys

I also tried it in config/make.conf.
Any hints?


References:
1) https://wiki.freebsd.org/FreeBSD/arm/Chromebook
2) http://lists.freebsd.org/pipermail/freebsd-arm/2014-January/007249.html
3) https://wiki.freebsd.org/BuildingFreeBSDWithClang
4) http://www.chromium.org/chromium-os/developer-information-for-chrome-os-devices/samsung-chromebook-2
-- 
Torfinn Ingolfsen <torfinn.ingolfsen@getmail.no>



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