[gustavoars:totally-untested/remaining-fam0 1/2] drivers/net/can/usb/etas_es58x/es58x_core.h:225:5: error: flexible array member 'raw_cmd' in a union is not allowed

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git totally-untested/remaining-fam0
head:   b0684d2f714f4ae515c283697c48d14e3ccef21b
commit: 9b8e2a44bb97e6316a5d268f9812543e2f6f1d44 [1/2] totally-untested: remaining zero-length arrays in unions in next-20220811
config: x86_64-randconfig-a016 (https://download.01.org/0day-ci/archive/20220812/202208122128.dEarB7X1-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 5f1c7e2cc5a3c07cbc2412e851a7283c1841f520)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=9b8e2a44bb97e6316a5d268f9812543e2f6f1d44
        git remote add gustavoars https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git
        git fetch --no-tags gustavoars totally-untested/remaining-fam0
        git checkout 9b8e2a44bb97e6316a5d268f9812543e2f6f1d44
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   In file included from drivers/net/can/usb/etas_es58x/es58x_core.c:20:
>> drivers/net/can/usb/etas_es58x/es58x_core.h:225:5: error: flexible array member 'raw_cmd' in a union is not allowed
           u8 raw_cmd[];
              ^
   1 error generated.


vim +/raw_cmd +225 drivers/net/can/usb/etas_es58x/es58x_core.h

   216	
   217	union es58x_urb_cmd {
   218		struct es581_4_urb_cmd es581_4_urb_cmd;
   219		struct es58x_fd_urb_cmd es58x_fd_urb_cmd;
   220		struct {		/* Common header parts of all variants */
   221			__le16 sof;
   222			u8 cmd_type;
   223			u8 cmd_id;
   224		} __packed;
 > 225		u8 raw_cmd[];
   226	};
   227	

-- 
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https://01.org/lkp