[weston] Makefile.am: Link weston_multi_resource against rt library

[Bryce Harrington]

On Mon, Oct 27, 2014 at 03:13:19PM +0000, Javier Jardón wrote:
> This fixes this build failure:
> 
> /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.3/../../../../x86_64-unknown-linux-gnu/bin/ld:
> clients/weston_multi_resource-multi-resource.o: undefined reference to
> symbol 'clock_gettime@@GLIBC_2.2.5'
> /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.3/../../../../x86_64-unknown-linux-gnu/bin/ld:
> note: 'clock_gettime@@GLIBC_2.2.5' is defined in DSO /lib64/librt.so.1
> so try adding it to the linker command line
> /lib64/librt.so.1: could not read symbols: Invalid operation
> ---
>  Makefile.am | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Makefile.am b/Makefile.am
> index b2d6893..0c08acb 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -419,7 +419,7 @@ weston_simple_touch_LDADD = $(SIMPLE_CLIENT_LIBS) libshared.la
>  
>  weston_multi_resource_SOURCES = clients/multi-resource.c
>  weston_multi_resource_CFLAGS = $(AM_CFLAGS) $(SIMPLE_CLIENT_CFLAGS)
> -weston_multi_resource_LDADD = $(SIMPLE_CLIENT_LIBS) libshared.la -lm
> +weston_multi_resource_LDADD = $(SIMPLE_CLIENT_LIBS) libshared.la -lrt -lm
>  endif
>  
>  if BUILD_SIMPLE_EGL_CLIENTS

If -lrt is required, you may want to also add an appropriate test to
configure.ac, so if it's missing it'll be flagged at configure time
rather than at link time.

Bryce