Avoid compilation error due to MacOS X 10.5 gcc cross-compilation bug.

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

diff --git a/tests/test-ldexpl.c b/tests/test-ldexpl.c
index 9f3de02..272fc4f 100644 (file)
--- a/tests/test-ldexpl.c
+++ b/tests/test-ldexpl.c
@@ -39,6 +39,16 @@
     }                                                                       \
   while (0)
 
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+   So we use minus_zero instead.
+   Note that the expression -LDBL_MIN * LDBL_MIN does not work on other
+   platforms, such as when cross-compiling to PowerPC on MacOS X 10.5.  */
+#if defined __hpux || defined __sgi
+long double minus_zero = -LDBL_MIN * LDBL_MIN;
+#else
+long double minus_zero = -0.0L;
+#endif
+
 int
 main ()
 {
@@ -78,7 +88,7 @@ main ()
   }
 
   { /* Negative zero.  */
-    x = -0.0L;
+    x = minus_zero;
     y = ldexpl (x, 0); ASSERT (y == x); ASSERT (signbit (x));
     y = ldexpl (x, 5); ASSERT (y == x); ASSERT (signbit (x));
     y = ldexpl (x, -5); ASSERT (y == x); ASSERT (signbit (x));