Re: [PATCH] time: Fix compile error in itimer test affecting hurd

[Stafford Horne <shorne@gmail.com>]

On Thu, Aug 19, 2021 at 11:58:53PM +0900, Stafford Horne wrote:
> The recent change to use __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 to avoid
> doing 64-bit checks on some platforms broke the test for hurd where
> __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 is not defined.  With error:
> 
>     tst-itimer.c: In function 'do_test':
>     tst-itimer.c:103:11: error: '__KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64' undeclared (first use in this function)
>       103 |       if (__KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64)
> 	  |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>     tst-itimer.c:103:11: note: each undeclared identifier is reported only once for each function it appears in
> 
> Define a new macro that works for both hurd and linux to detect when
> setitimer and getitimer support 64-bit time_t.
> 
> Fixes commit 6e8a0aac2f ("time: Fix overflow itimer tests on 32-bit
> systems").
> 
> Cc: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> Cc: Joseph Myers <joseph@codesourcery.com>
> ---
> Hi Joseph,
> 
> I know you mentioned defining a new macro, I was not sure if you meant in the
> test or globally.  I opted to add this to the test as I don't see a good reason
> to add the macro to hurd which is only needed for this test.
> 
> I build tested this on i686-gnu and ran my tests on or1k and it does work.
> 
> -Stafford
> 
>  time/tst-itimer.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/time/tst-itimer.c b/time/tst-itimer.c
> index bd7d7afe83..af97ef6acf 100644
> --- a/time/tst-itimer.c
> +++ b/time/tst-itimer.c
> @@ -25,6 +25,12 @@
>  #include <unistd.h>
>  #include <time.h>
>  
> +#ifdef __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
> +# define ITIMER_SUPPORTS_TIMESPEC64 __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
> +#else
> +# define ITIMER_SUPPORTS_TIMESPEC64 (sizeof (__time_t) == 8)
> +#endif
> +

As suggested by Adhemerval I will create a v2 of this patch moving the gist of
this into support/xtime.h.

-Stafford