From: Arnd Bergmann arnd@arndb.de Subject: lib/ubsan.c: don't mark __ubsan_handle_builtin_unreachable as noreturn

gcc-8 complains about the prototype for this function:

lib/ubsan.c:432:1: error: ignoring attribute 'noreturn' in declaration of a built-in function '__ubsan_handle_builtin_unreachable' because it conflicts with attribute 'const' [-Werror=attributes]

This is actually a GCC's bug. In GCC internals __ubsan_handle_builtin_unreachable() declared with both 'noreturn' and 'const' attributes instead of only 'noreturn': https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84210

Workaround this by removing the noreturn attribute.

[aryabinin: add information about GCC bug in changelog] Link: http://lkml.kernel.org/r/20181107144516.4587-1-aryabinin@virtuozzo.com Signed-off-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Andrey Ryabinin aryabinin@virtuozzo.com Acked-by: Olof Johansson olof@lixom.net Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

--- a/lib/ubsan.c~ubsan-dont-mark-__ubsan_handle_builtin_unreachable-as-noreturn +++ a/lib/ubsan.c @@ -427,8 +427,7 @@ void __ubsan_handle_shift_out_of_bounds( EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);

-void __noreturn -__ubsan_handle_builtin_unreachable(struct unreachable_data *data) +void __ubsan_handle_builtin_unreachable(struct unreachable_data *data) { unsigned long flags;

_