clock() returns (clock_t)-1 on error, not necessarily negative.

If clock_t is unsigned, n < 0 is always false.  Compare for equality
with (clock_t)-1.

diff --git a/src/microcode/prosenv.c b/src/microcode/prosenv.c
index f0d2ac04f02c12b78f257a5bc2f224e013c53879..52cf4bb82fdb29d1460458f7bd9507b67a86ac56 100644 (file)
--- a/src/microcode/prosenv.c
+++ b/src/microcode/prosenv.c
@@ -141,7 +141,7 @@ DEFINE_PRIMITIVE ("CURRENT-JIFFY", Prim_current_jiffy, 0, 0, 0)
 {
   PRIMITIVE_HEADER (0);
   clock_t n = (OS_current_jiffy ());
-  PRIMITIVE_RETURN ((n < 0) ? SHARP_F : (intmax_to_integer (n)));
+  PRIMITIVE_RETURN ((n == (clock_t)-1) ? SHARP_F : (intmax_to_integer (n)));
 }
 
 DEFINE_PRIMITIVE ("JIFFIES-PER-SECOND", Prim_jiffies_per_second, 0, 0, 0)