[CRIU] [PATCH] crtools.c: fix compilation by clang

[Cyrill Gorcunov]

On Fri, May 01, 2015 at 01:37:42PM +0300, Andrey Wagin wrote:
> 2015-05-01 11:30 GMT+03:00 Tycho Andersen <tycho.andersen at canonical.com>:
> > Hi Kir,
> >
> > On Thu, Apr 30, 2015 at 04:25:44PM -0700, Kir Kolyshkin wrote:
> >> Fix the following error:
> >>
> >> >   LINK     arch/x86/syscalls.built-in.o
> >> > arch/x86/crtools.c:36:20: error: unused function '__check_code_syscall'
> >> >       [-Werror,-Wunused-function]
> >> > static inline void __check_code_syscall(void)
> >>
> >> As the function consists of a few BUILD_BUG_ONs, it gets optimized out.
> >> Let's add __attribute__((__used__)) so clang stops complaining.
> >>
> >> Signed-off-by: Kir Kolyshkin <kir at openvz.org>
> >> ---
> >>  arch/x86/crtools.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/arch/x86/crtools.c b/arch/x86/crtools.c
> >> index d721ac8..4e7b090 100644
> >> --- a/arch/x86/crtools.c
> >> +++ b/arch/x86/crtools.c
> >> @@ -33,7 +33,7 @@ const char code_syscall[] = {
> >>
> >>  const int code_syscall_size = round_up(sizeof(code_syscall), sizeof(long));
> >>
> >> -static inline void __check_code_syscall(void)
> >> +static inline __used void __check_code_syscall(void)
> >
> > Isn't it actually unused? I can't find it via grep.
> 
> Maybe it's here only for BUILD_BUG_ON?

Yes, we catually may move it to some other function body,
but since gcc never complained about such case I put
it as a esparate one.