FS#1805 - ar71xx build failure with kernel 4.14 #6953
Comments
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xback: Can you share the exact target you try to use? Thanks, Koen |
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hardfalcon: I can reproduce this with the current git master for the targets //tl-wa860re-v1// and //tl-wr710n-v2// (which are both //ar71xx/tiny// devices). EDIT: The //ar71xx/generic// target //tl-wr810n-v2// seems to build flawlessly, so it looks like this issue is constrained to //ar71xx/tiny// targets. |
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hardfalcon: I've created a patch/pull request that fixes this: |
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xback: I just compile-tested targets tl-wa860re-v1 and tl-wr710n-v2 (including IPv6) and it builds without an issue. Which compiler version are you using? |
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hardfalcon: I've just re-tested it with a fresh vanilla clone of the OpenWRT git repository for the tl-wr860-v1 build target. When using the default compiler (gcc 7.3), no error occurs, but when selecting gcc 8.2 (as mentioned in the original bug report), the build process fails again exactly the same error as listed above. When applying the patch from my pull request, the build process goes through again without any errors and yields both a working sysupgrade image and a factory upgrade image that I didn't test. Like I said on IRC, I've tried the patch for more than 3 weeks on several different TP-Link ar71xx devices (all compiled using gcc 8.2.0 and a few additional hardening build options) and didn't notice any crashes or any other drawbacks. Excerpt of the above mentioned hardening build options: //EDIT: For the sake of completeness: The error described in the bug report is probably triggered by [[https://gcc.gnu.org/onlinedocs/gcc-8.1.0/gcc/Warning-Options.html#index-Wpacked-not-aligned|-Wpacked-not-aligned]] which was [[https://gcc.gnu.org/gcc-8/changes.html|introduced]] with GCC 8 and is part of -Wall. |
nouman8:
compiling with GCC 8.2.0
CHK include/config/kernel.release
CHK include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
CHK include/generated/bounds.h
CHK include/generated/timeconst.h
CHK include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
CHK scripts/mod/devicetable-offsets.h
CHK include/generated/compile.h
CC arch/mips/ath79/dev-dsa.o
In file included from ./include/linux/ipv6.h:5,
from ./include/net/ipv6.h:16,
from ./include/net/inetpeer.h:16,
from ./include/net/ip_fib.h:24,
from ./include/net/switchdev.h:17,
from ./include/net/dsa.h:23,
from arch/mips/ath79/dev-dsa.h:15,
from arch/mips/ath79/dev-dsa.c:17:
./include/uapi/linux/ipv6.h:107:1: error: alignment 1 of 'struct ipv6_destopt_hao' is less than 2 [-Werror=packed-not-aligned]
} attribute((packed));
^
cc1: all warnings being treated as errors
make[7]: *** [scripts/Makefile.build:329: arch/mips/ath79/dev-dsa.o] Error 1
make[6]: *** [scripts/Makefile.build:587: arch/mips/ath79] Error 2
make[5]: *** [Makefile:1035: arch/mips] Error 2
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