Compilation failed `rkwifi/bcmdhd/dhd_linux.o` with `rockchip_linux_defconfig` on `stable-4.4-rk3399-linux`

[DamonBlais]

I am using rockchip_linux_defconfig and the latest develop-4.4 OR stable-4.4-rk3399-linux

e.g: " This repository doesn't build. "

stable-4.4-rk3399-linux

  CC [M]  drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.o
drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.c: In function 'dhd_attach':
drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.c:9454:4: warning: 'strncat' specified bound 2 equals source length [-Wstringop-overflow=]
error, forbidden warning:dhd_linux.c:9454
 9454 |    strncat(if_name, "%d", 2);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~
make[6]: *** [scripts/Makefile.build:278: drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.o] Error 1
make[6]: *** Deleting file 'drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.o'
make[5]: *** [scripts/Makefile.build:484: drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd] Error 2
make[4]: *** [scripts/Makefile.build:484: drivers/net/wireless/rockchip_wlan/rkwifi] Error 2
make[3]: *** [scripts/Makefile.build:484: drivers/net/wireless/rockchip_wlan] Error 2
make[2]: *** [scripts/Makefile.build:484: drivers/net/wireless] Error 2
make[1]: *** [scripts/Makefile.build:484: drivers/net] Error 2
make: *** [Makefile:1036: drivers] Error 2

develop-4.4

  CC [M]  drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.o
drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.c: In function 'dhd_attach':
drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.c:9454:4: warning: 'strncat' specified bound 2 equals source length [-Wstringop-overflow=]
error, forbidden warning:dhd_linux.c:9454
 9454 |    strncat(if_name, "%d", 2);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~
make[6]: *** [scripts/Makefile.build:278: drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.o] Error 1
make[6]: *** Deleting file 'drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd/dhd_linux.o'
make[5]: *** [scripts/Makefile.build:484: drivers/net/wireless/rockchip_wlan/rkwifi/bcmdhd] Error 2
make[4]: *** [scripts/Makefile.build:484: drivers/net/wireless/rockchip_wlan/rkwifi] Error 2
make[3]: *** [scripts/Makefile.build:484: drivers/net/wireless/rockchip_wlan] Error 2
make[2]: *** [scripts/Makefile.build:484: drivers/net/wireless] Error 2
make[1]: *** [scripts/Makefile.build:484: drivers/net] Error 2
make: *** [Makefile:1036: drivers] Error 2

[DamonBlais]

Commands used to compile (failed):

$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- rockchip_linux_defconfig
$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j9

System compiled on:

$ gcc --version
gcc (GCC) 9.2.1 20190827 (Red Hat 9.2.1-1)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ g++ --version
g++ (GCC) 9.2.1 20190827 (Red Hat 9.2.1-1)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ cat /etc/redhat-release 
Fedora release 31 (Thirty One)

$ uname -a
Linux doom2 5.3.12-300.fc31.x86_64 #1 SMP Thu Nov 21 22:52:07 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

[DamonBlais]

cross-compiler is aarch64-linux-gnu-gcc

$ aarch64-linux-gnu-gcc --version
aarch64-linux-gnu-gcc (GCC) 9.2.1 20190827 (Red Hat Cross 9.2.1-1)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Provided by:

$ dnf info gcc-aarch64-linux-gnu
Installed Packages
Name         : gcc-aarch64-linux-gnu
Version      : 9.2.1
Release      : 1.fc31
Architecture : x86_64
Size         : 55 M
Source       : cross-gcc-9.2.1-1.fc31.src.rpm

[LE0xUL]

A bit late, but can help someone else. Try adding -Wno-stringop-overflow to KCFLAGS:

$ KCFLAGS="-Wno-stringop-overflow" make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j9 rockchip_linux_defconfig all