xclock: Changes to 'master'

[Alan Coopersmith]

 Clock.c      |    4 ++--
 configure.ac |    2 +-
 xclock.c     |   25 +++++++++++++------------
 3 files changed, 16 insertions(+), 15 deletions(-)

New commits:
commit 1ac04613b566ba0dde29a16f3ac409832f32d74e
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Thu Jul 18 21:02:55 2013 -0700

    Combine usage message strings & print them to stderr, not stdout
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit 61f95e11eef3fbfb9060a32233df13c35115a6f3
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Thu Jul 18 20:59:01 2013 -0700

    Add noreturn attributes suggested by -Wmissing-noreturn
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit 52bbd1ce31f1adf2b7145b9d6183f6b866fa9301
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Thu Jul 18 20:50:17 2013 -0700

    Store sine & cosine tables as doubles instead of floats
    
    Since they're used as doubles in the calculations, might as well store them
    that way instead of converting when read from the table at runtime.
    
    Costs about 4k more storage in the binary for the doubled tables.
    
    Also gets rid of 900 clang warnings, of the form:
    
    Clock.c:1708:11: warning: implicit conversion loses floating-point precision:
          'double' to 'float' [-Wconversion]
    0.000000, 0.001745, 0.003490, 0.005235, 0.006981, 0.008726, 0.010471, 0.012217,
    
    (one for each table entry)
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>