Files
linux/include/linux
Andrew Morton 1d351f1894 revert "kbuild: fix -Wimplicit-function-declaration in license_is_gpl_compatible"
It causes build failures with unusual CC/HOSTCC combinations.

Quoting
https://lkml.kernel.org/r/A222B1E6-69B8-4085-AD1B-27BDB72CA971@goldelico.com:

  HOSTCC  scripts/mod/modpost.o - due to target missing
In file included from include/linux/string.h:5,
                 from scripts/mod/../../include/linux/license.h:5,
                 from scripts/mod/modpost.c:24:
include/linux/compiler.h:246:10: fatal error: asm/rwonce.h: No such file or directory
  246 | #include <asm/rwonce.h>
      |          ^~~~~~~~~~~~~~
compilation terminated.

...

The problem is that HOSTCC is not necessarily the same compiler or even
architecture as CC and pulling in <linux/compiler.h> or <asm/rwonce.h>
files indirectly isn't a good idea then.

My toolchain is providing HOSTCC = gcc (MacPorts) and CC = arm-linux-gnueabihf
(built from gcc source) and all running on Darwin.

If I change the include to <string.h> I can then "HOSTCC scripts/mod/modpost.c"
but then it fails for "CC kernel/module/main.c" not finding <string.h>:

  CC      kernel/module/main.o - due to target missing
In file included from kernel/module/main.c:43:0:
./include/linux/license.h:5:20: fatal error: string.h: No such file or directory
 #include <string.h>
                    ^
compilation terminated.

Reported-by: "H. Nikolaus Schaller" <hns@goldelico.com>
Cc: Sam James <sam@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-11-30 14:49:42 -08:00
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