The sem_timedwait function has been annotated as requiring
non-null args in latest header files from GCC snapshot
representing the future 2.30 release.

This causes configure to fail when -Werror is used:

config-temp/qemu-conf.c: In function ‘main’:
config-temp/qemu-conf.c:2:25: error: null argument where non-null required (argument 1) [-Werror=nonnull]
    2 | int main(void) { return sem_timedwait(0, 0); }
      |                         ^~~~~~~~~~~~~
config-temp/qemu-conf.c:2:25: error: null argument where non-null required (argument 2) [-Werror=nonnull]

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index b091b82cb3..6632d05fc7 100755
--- a/configure
+++ b/configure
@@ -5139,7 +5139,7 @@ fi
 sem_timedwait=no
 cat > $TMPC << EOF
 #include <semaphore.h>
-int main(void) { return sem_timedwait(0, 0); }
+int main(void) { sem_t s; struct timespec t = {0}; return sem_timedwait(&s, &t); }
 EOF
 if compile_prog "" "" ; then
     sem_timedwait=yes
-- 
2.21.0

Le 17/06/2019 à 13:41, Daniel P. Berrangé a écrit :
> The sem_timedwait function has been annotated as requiring
> non-null args in latest header files from GCC snapshot
> representing the future 2.30 release.
> 
> This causes configure to fail when -Werror is used:
> 
> config-temp/qemu-conf.c: In function ‘main’:
> config-temp/qemu-conf.c:2:25: error: null argument where non-null required (argument 1) [-Werror=nonnull]
>     2 | int main(void) { return sem_timedwait(0, 0); }
>       |                         ^~~~~~~~~~~~~
> config-temp/qemu-conf.c:2:25: error: null argument where non-null required (argument 2) [-Werror=nonnull]
> 
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>  configure | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/configure b/configure
> index b091b82cb3..6632d05fc7 100755
> --- a/configure
> +++ b/configure
> @@ -5139,7 +5139,7 @@ fi
>  sem_timedwait=no
>  cat > $TMPC << EOF
>  #include <semaphore.h>
> -int main(void) { return sem_timedwait(0, 0); }
> +int main(void) { sem_t s; struct timespec t = {0}; return sem_timedwait(&s, &t); }
>  EOF
>  if compile_prog "" "" ; then
>      sem_timedwait=yes
> 

Applied to my trivial-patches branch.

Thanks,
Laurent

Le 17/06/2019 à 13:41, Daniel P. Berrangé a écrit :
> The sem_timedwait function has been annotated as requiring
> non-null args in latest header files from GCC snapshot
> representing the future 2.30 release.
> 
> This causes configure to fail when -Werror is used:
> 
> config-temp/qemu-conf.c: In function ‘main’:
> config-temp/qemu-conf.c:2:25: error: null argument where non-null required (argument 1) [-Werror=nonnull]
>     2 | int main(void) { return sem_timedwait(0, 0); }
>       |                         ^~~~~~~~~~~~~
> config-temp/qemu-conf.c:2:25: error: null argument where non-null required (argument 2) [-Werror=nonnull]
> 
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>  configure | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/configure b/configure
> index b091b82cb3..6632d05fc7 100755
> --- a/configure
> +++ b/configure
> @@ -5139,7 +5139,7 @@ fi
>  sem_timedwait=no
>  cat > $TMPC << EOF
>  #include <semaphore.h>
> -int main(void) { return sem_timedwait(0, 0); }
> +int main(void) { sem_t s; struct timespec t = {0}; return sem_timedwait(&s, &t); }
>  EOF
>  if compile_prog "" "" ; then
>      sem_timedwait=yes
> 

Reviewed-by: Laurent Vivier <laurent@vivier.eu>