linux-kernel - error: redefinition of ‘shipped_regdb

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Date:   Tue, 19 Dec 2017 08:44:51 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Johannes Berg <johannes.berg@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: error: redefinition of ‘shipped_regdb_certs’

Hi Johannes,
this is the first time I am seeing this with the current Linus
tree. 4.15-rc3 compiled fine. I have checked that you have updated the
makefile which generates the file by 715a12334764 ("wireless: don't
write C files on failures").

I am getting the following compilation error:
  CC [M]  net/wireless/shipped-certs.o
net/wireless/shipped-certs.c:686:10: error: redefinition of ‘shipped_regdb_certs’
 const u8 shipped_regdb_certs[] = {
          ^~~~~~~~~~~~~~~~~~~
net/wireless/shipped-certs.c:2:10: note: previous definition of ‘shipped_regdb_certs’ was here
 const u8 shipped_regdb_certs[] = {
          ^~~~~~~~~~~~~~~~~~~
net/wireless/shipped-certs.c:1368:14: error: redefinition of ‘shipped_regdb_certs_len’
 unsigned int shipped_regdb_certs_len = sizeof(shipped_regdb_certs);
              ^~~~~~~~~~~~~~~~~~~~~~~
net/wireless/shipped-certs.c:684:14: note: previous definition of ‘shipped_regdb_certs_len’ was here
 unsigned int shipped_regdb_certs_len = sizeof(shipped_regdb_certs);
              ^~~~~~~~~~~~~~~~~~~~~~~
scripts/Makefile.build:310: recipe for target 'net/wireless/shipped-certs.o' failed
make[3]: *** [net/wireless/shipped-certs.o] Error 1
scripts/Makefile.build:569: recipe for target 'net/wireless' failed
make[2]: *** [net/wireless] Error 2
Makefile:1012: recipe for target 'net' failed
make[1]: *** [net] Error 2

I have no idea how the generated file is supposed to work but it seems
that the cleanup doesn't work properly.  Compilation succeeds if I
remove the file and it is generated again:

$ rm net/wireless/shipped-certs.c
[...]
  GEN     net/wireless/shipped-certs.c
  CC [M]  net/wireless/shipped-certs.o

I have double checked that neither make clean/distclean removed the
file. Strangely enough neither did the tree with 715a12334764 reverted.

Any idea?
-- 
Michal Hocko
SUSE Labs