Use a more portable replacement expression for -0.0L.

[gnulib.git] / tests / test-roundl.c

diff --git a/tests/test-roundl.c b/tests/test-roundl.c
index ae4d346..88cb854 100644 (file)
--- a/tests/test-roundl.c
+++ b/tests/test-roundl.c
@@ -22,6 +22,7 @@
 
 #include <math.h>
 
+#include <float.h>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -40,9 +41,9 @@
     }                                                                       \
   while (0)
 
-/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0L.
-   So we use -zero instead.  */
-long double zero = 0.0L;
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+   So we use minus_zero instead.  */
+long double minus_zero = -LDBL_MIN * LDBL_MIN;
 
 int
 main ()
@@ -53,7 +54,7 @@ main ()
 
   /* Zero.  */
   ASSERT (roundl (0.0L) == 0.0L);
-  ASSERT (roundl (-zero) == 0.0L);
+  ASSERT (roundl (minus_zero) == 0.0L);
   /* Positive numbers.  */
   ASSERT (roundl (0.3L) == 0.0L);
   ASSERT (roundl (0.5L) == 1.0L);