Problem building 9.4.7 on Fedora 36 (bytestring/cbits/is-valid-utf8.c)

[Rodrigo Mesquita]

Unfortunately you’re not the only developer facing these build errors.
They've been reported in #23810 <https://gitlab.haskell.org/ghc/ghc/-/issues/23810> and #23789 <https://gitlab.haskell.org/ghc/ghc/-/issues/23789>.

It might be worth pasting your workaround there too.

Thanks,
Rodrigo

> On 8 Aug 2023, at 16:33, Viktor Dukhovni <ietf-dane at dukhovni.org> wrote:
> 
> The build was failing, because rts/OSThreads.h via Rts.h from
> libraries/bytestring/cbits/is-valid-utf8.c had no definition of
> `clockid_t`.  This type is not exposed with _POSIX_C_SOURCE is
> not defined to a sufficiently high value:
> 
>    SYNOPSIS
>           #include <time.h>
> 
>           int clock_getres(clockid_t clockid, struct timespec *res);
> 
>           int clock_gettime(clockid_t clockid, struct timespec *tp);
>           int clock_settime(clockid_t clockid, const struct timespec *tp);
> 
>           Link with -lrt (only for glibc versions before 2.17).
> 
>       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
> 
>           clock_getres(), clock_gettime(), clock_settime():
>               _POSIX_C_SOURCE >= 199309L
> 
> I quick-and-dirty work-around was:
> 
> --- a/libraries/bytestring/cbits/is-valid-utf8.c
> +++ b/libraries/bytestring/cbits/is-valid-utf8.c
> @@ -27,6 +27,10 @@ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
> OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> SUCH DAMAGE.
> */
> +#undef _POSIX_C_SOURCE
> +#define _POSIX_C_SOURCE 200809L
> +#undef _XOPEN_SOURCE
> +#define _XOPEN_SOURCE   700
> #pragma GCC push_options
> #pragma GCC optimize("-O2")
> #include <stdbool.h>
> 
> 
> There's surely a better solution.
> 
> -- 
>    Viktor.
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