Fix bugs in file timestamp newness comparisons.

* fileio.c (Ffile_newer_than_file_p):
* lread.c (Fload): Use full timestamp resolution of files,
not just the 1-second resolution, so that files that are only
slightly newer still count as newer.
* fileio.c (Ffile_newer_than_file_p): Don't assume file
timestamps fit in 'int'; this fixes a Y2038 bug on most hosts.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lread.c b/src/lread.c
index 7a0b20880e9..1e496bf9742 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -26,6 +26,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <errno.h>
 #include <limits.h>     /* For CHAR_BIT.  */
 #include <setjmp.h>
+#include <stat-time.h>
 #include "lisp.h"
 #include "intervals.h"
 #include "character.h"
@@ -1214,7 +1215,8 @@ Return t if the file exists and loads successfully.  */)
               SSET (efound, SBYTES (efound) - 1, 'c');
             }
 
-          if (result == 0 && s1.st_mtime < s2.st_mtime)
+          if (result == 0
+              && EMACS_TIME_LT (get_stat_mtime (&s1), get_stat_mtime (&s2)))
             {
               /* Make the progress messages mention that source is newer.  */
               newer = 1;